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-rw-r--r--arch/riscv/kernel/.gitignore2
-rw-r--r--arch/riscv/kernel/Makefile91
-rw-r--r--arch/riscv/kernel/alternative.c118
-rw-r--r--arch/riscv/kernel/asm-offsets.c477
-rw-r--r--arch/riscv/kernel/cacheinfo.c189
-rw-r--r--arch/riscv/kernel/compat_signal.c243
-rw-r--r--arch/riscv/kernel/compat_syscall_table.c19
-rw-r--r--arch/riscv/kernel/compat_vdso/.gitignore2
-rw-r--r--arch/riscv/kernel/compat_vdso/Makefile88
-rw-r--r--arch/riscv/kernel/compat_vdso/compat_vdso.S8
-rw-r--r--arch/riscv/kernel/compat_vdso/compat_vdso.lds.S3
-rw-r--r--arch/riscv/kernel/compat_vdso/flush_icache.S3
-rwxr-xr-xarch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh5
-rw-r--r--arch/riscv/kernel/compat_vdso/getcpu.S3
-rw-r--r--arch/riscv/kernel/compat_vdso/note.S3
-rw-r--r--arch/riscv/kernel/compat_vdso/rt_sigreturn.S3
-rw-r--r--arch/riscv/kernel/cpu-hotplug.c83
-rw-r--r--arch/riscv/kernel/cpu.c267
-rw-r--r--arch/riscv/kernel/cpu_ops.c37
-rw-r--r--arch/riscv/kernel/cpu_ops_sbi.c129
-rw-r--r--arch/riscv/kernel/cpu_ops_spinwait.c70
-rw-r--r--arch/riscv/kernel/cpufeature.c327
-rw-r--r--arch/riscv/kernel/crash_dump.c28
-rw-r--r--arch/riscv/kernel/crash_save_regs.S56
-rw-r--r--arch/riscv/kernel/efi-header.S111
-rw-r--r--arch/riscv/kernel/efi.c96
-rw-r--r--arch/riscv/kernel/elf_kexec.c469
-rw-r--r--arch/riscv/kernel/entry.S607
-rw-r--r--arch/riscv/kernel/fpu.S106
-rw-r--r--arch/riscv/kernel/ftrace.c209
-rw-r--r--arch/riscv/kernel/head.S437
-rw-r--r--arch/riscv/kernel/head.h24
-rw-r--r--arch/riscv/kernel/image-vars.h42
-rw-r--r--arch/riscv/kernel/irq.c24
-rw-r--r--arch/riscv/kernel/jump_label.c41
-rw-r--r--arch/riscv/kernel/kexec_relocate.S221
-rw-r--r--arch/riscv/kernel/kgdb.c390
-rw-r--r--arch/riscv/kernel/machine_kexec.c239
-rw-r--r--arch/riscv/kernel/machine_kexec_file.c14
-rw-r--r--arch/riscv/kernel/mcount-dyn.S191
-rw-r--r--arch/riscv/kernel/mcount.S129
-rw-r--r--arch/riscv/kernel/module-sections.c159
-rw-r--r--arch/riscv/kernel/module.c459
-rw-r--r--arch/riscv/kernel/patch.c164
-rw-r--r--arch/riscv/kernel/perf_callchain.c78
-rw-r--r--arch/riscv/kernel/perf_regs.c43
-rw-r--r--arch/riscv/kernel/probes/Makefile8
-rw-r--r--arch/riscv/kernel/probes/decode-insn.c47
-rw-r--r--arch/riscv/kernel/probes/decode-insn.h18
-rw-r--r--arch/riscv/kernel/probes/ftrace.c62
-rw-r--r--arch/riscv/kernel/probes/kprobes.c389
-rw-r--r--arch/riscv/kernel/probes/kprobes_trampoline.S93
-rw-r--r--arch/riscv/kernel/probes/simulate-insn.c197
-rw-r--r--arch/riscv/kernel/probes/simulate-insn.h47
-rw-r--r--arch/riscv/kernel/probes/uprobes.c182
-rw-r--r--arch/riscv/kernel/process.c191
-rw-r--r--arch/riscv/kernel/ptrace.c351
-rw-r--r--arch/riscv/kernel/reset.c34
-rw-r--r--arch/riscv/kernel/riscv_ksyms.c17
-rw-r--r--arch/riscv/kernel/sbi.c697
-rw-r--r--arch/riscv/kernel/setup.c328
-rw-r--r--arch/riscv/kernel/signal.c346
-rw-r--r--arch/riscv/kernel/smp.c334
-rw-r--r--arch/riscv/kernel/smpboot.c184
-rw-r--r--arch/riscv/kernel/soc.c28
-rw-r--r--arch/riscv/kernel/stacktrace.c146
-rw-r--r--arch/riscv/kernel/suspend.c87
-rw-r--r--arch/riscv/kernel/suspend_entry.S125
-rw-r--r--arch/riscv/kernel/sys_riscv.c71
-rw-r--r--arch/riscv/kernel/syscall_table.c18
-rw-r--r--arch/riscv/kernel/time.c44
-rw-r--r--arch/riscv/kernel/trace_irq.c27
-rw-r--r--arch/riscv/kernel/trace_irq.h11
-rw-r--r--arch/riscv/kernel/traps.c262
-rw-r--r--arch/riscv/kernel/traps_misaligned.c366
-rw-r--r--arch/riscv/kernel/vdso.c322
-rw-r--r--arch/riscv/kernel/vdso/.gitignore4
-rw-r--r--arch/riscv/kernel/vdso/Makefile83
-rw-r--r--arch/riscv/kernel/vdso/flush_icache.S22
-rwxr-xr-xarch/riscv/kernel/vdso/gen_vdso_offsets.sh5
-rw-r--r--arch/riscv/kernel/vdso/getcpu.S18
-rw-r--r--arch/riscv/kernel/vdso/note.S12
-rw-r--r--arch/riscv/kernel/vdso/rt_sigreturn.S16
-rw-r--r--arch/riscv/kernel/vdso/vdso.S23
-rw-r--r--arch/riscv/kernel/vdso/vdso.lds.S80
-rw-r--r--arch/riscv/kernel/vdso/vgettimeofday.c31
-rw-r--r--arch/riscv/kernel/vmlinux-xip.lds.S149
-rw-r--r--arch/riscv/kernel/vmlinux.lds.S149
88 files changed, 12131 insertions, 0 deletions
diff --git a/arch/riscv/kernel/.gitignore b/arch/riscv/kernel/.gitignore
new file mode 100644
index 000000000..e052ed331
--- /dev/null
+++ b/arch/riscv/kernel/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/vmlinux.lds
diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile
new file mode 100644
index 000000000..ab333cb79
--- /dev/null
+++ b/arch/riscv/kernel/Makefile
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the RISC-V Linux kernel
+#
+
+ifdef CONFIG_FTRACE
+CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_patch.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_sbi.o = $(CC_FLAGS_FTRACE)
+endif
+CFLAGS_syscall_table.o += $(call cc-option,-Wno-override-init,)
+CFLAGS_compat_syscall_table.o += $(call cc-option,-Wno-override-init,)
+
+ifdef CONFIG_KEXEC
+AFLAGS_kexec_relocate.o := -mcmodel=medany $(call cc-option,-mno-relax)
+endif
+
+# cmodel=medany and notrace when patching early
+ifdef CONFIG_RISCV_ALTERNATIVE_EARLY
+CFLAGS_alternative.o := -mcmodel=medany
+CFLAGS_cpufeature.o := -mcmodel=medany
+ifdef CONFIG_FTRACE
+CFLAGS_REMOVE_alternative.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_cpufeature.o = $(CC_FLAGS_FTRACE)
+endif
+ifdef CONFIG_KASAN
+KASAN_SANITIZE_alternative.o := n
+KASAN_SANITIZE_cpufeature.o := n
+endif
+endif
+
+extra-y += vmlinux.lds
+
+obj-y += head.o
+obj-y += soc.o
+obj-$(CONFIG_RISCV_ALTERNATIVE) += alternative.o
+obj-y += cpu.o
+obj-y += cpufeature.o
+obj-y += entry.o
+obj-y += irq.o
+obj-y += process.o
+obj-y += ptrace.o
+obj-y += reset.o
+obj-y += setup.o
+obj-y += signal.o
+obj-y += syscall_table.o
+obj-y += sys_riscv.o
+obj-y += time.o
+obj-y += traps.o
+obj-y += riscv_ksyms.o
+obj-y += stacktrace.o
+obj-y += cacheinfo.o
+obj-y += patch.o
+obj-y += probes/
+obj-$(CONFIG_MMU) += vdso.o vdso/
+
+obj-$(CONFIG_RISCV_M_MODE) += traps_misaligned.o
+obj-$(CONFIG_FPU) += fpu.o
+obj-$(CONFIG_SMP) += smpboot.o
+obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_SMP) += cpu_ops.o
+
+obj-$(CONFIG_RISCV_BOOT_SPINWAIT) += cpu_ops_spinwait.o
+obj-$(CONFIG_MODULES) += module.o
+obj-$(CONFIG_MODULE_SECTIONS) += module-sections.o
+
+obj-$(CONFIG_CPU_PM) += suspend_entry.o suspend.o
+
+obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
+obj-$(CONFIG_DYNAMIC_FTRACE) += mcount-dyn.o
+
+obj-$(CONFIG_TRACE_IRQFLAGS) += trace_irq.o
+
+obj-$(CONFIG_PERF_EVENTS) += perf_callchain.o
+obj-$(CONFIG_HAVE_PERF_REGS) += perf_regs.o
+obj-$(CONFIG_RISCV_SBI) += sbi.o
+ifeq ($(CONFIG_RISCV_SBI), y)
+obj-$(CONFIG_SMP) += cpu_ops_sbi.o
+endif
+obj-$(CONFIG_HOTPLUG_CPU) += cpu-hotplug.o
+obj-$(CONFIG_KGDB) += kgdb.o
+obj-$(CONFIG_KEXEC_CORE) += kexec_relocate.o crash_save_regs.o machine_kexec.o
+obj-$(CONFIG_KEXEC_FILE) += elf_kexec.o machine_kexec_file.o
+obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+
+obj-$(CONFIG_JUMP_LABEL) += jump_label.o
+
+obj-$(CONFIG_EFI) += efi.o
+obj-$(CONFIG_COMPAT) += compat_syscall_table.o
+obj-$(CONFIG_COMPAT) += compat_signal.o
+obj-$(CONFIG_COMPAT) += compat_vdso/
diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c
new file mode 100644
index 000000000..a7d26a00b
--- /dev/null
+++ b/arch/riscv/kernel/alternative.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * alternative runtime patching
+ * inspired by the ARM64 and x86 version
+ *
+ * Copyright (C) 2021 Sifive.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/uaccess.h>
+#include <asm/alternative.h>
+#include <asm/sections.h>
+#include <asm/vendorid_list.h>
+#include <asm/sbi.h>
+#include <asm/csr.h>
+
+struct cpu_manufacturer_info_t {
+ unsigned long vendor_id;
+ unsigned long arch_id;
+ unsigned long imp_id;
+ void (*patch_func)(struct alt_entry *begin, struct alt_entry *end,
+ unsigned long archid, unsigned long impid,
+ unsigned int stage);
+};
+
+static void __init_or_module riscv_fill_cpu_mfr_info(struct cpu_manufacturer_info_t *cpu_mfr_info)
+{
+#ifdef CONFIG_RISCV_M_MODE
+ cpu_mfr_info->vendor_id = csr_read(CSR_MVENDORID);
+ cpu_mfr_info->arch_id = csr_read(CSR_MARCHID);
+ cpu_mfr_info->imp_id = csr_read(CSR_MIMPID);
+#else
+ cpu_mfr_info->vendor_id = sbi_get_mvendorid();
+ cpu_mfr_info->arch_id = sbi_get_marchid();
+ cpu_mfr_info->imp_id = sbi_get_mimpid();
+#endif
+
+ switch (cpu_mfr_info->vendor_id) {
+#ifdef CONFIG_ERRATA_SIFIVE
+ case SIFIVE_VENDOR_ID:
+ cpu_mfr_info->patch_func = sifive_errata_patch_func;
+ break;
+#endif
+#ifdef CONFIG_ERRATA_THEAD
+ case THEAD_VENDOR_ID:
+ cpu_mfr_info->patch_func = thead_errata_patch_func;
+ break;
+#endif
+ default:
+ cpu_mfr_info->patch_func = NULL;
+ }
+}
+
+/*
+ * This is called very early in the boot process (directly after we run
+ * a feature detect on the boot CPU). No need to worry about other CPUs
+ * here.
+ */
+static void __init_or_module _apply_alternatives(struct alt_entry *begin,
+ struct alt_entry *end,
+ unsigned int stage)
+{
+ struct cpu_manufacturer_info_t cpu_mfr_info;
+
+ riscv_fill_cpu_mfr_info(&cpu_mfr_info);
+
+ riscv_cpufeature_patch_func(begin, end, stage);
+
+ if (!cpu_mfr_info.patch_func)
+ return;
+
+ cpu_mfr_info.patch_func(begin, end,
+ cpu_mfr_info.arch_id,
+ cpu_mfr_info.imp_id,
+ stage);
+}
+
+void __init apply_boot_alternatives(void)
+{
+ /* If called on non-boot cpu things could go wrong */
+ WARN_ON(smp_processor_id() != 0);
+
+ _apply_alternatives((struct alt_entry *)__alt_start,
+ (struct alt_entry *)__alt_end,
+ RISCV_ALTERNATIVES_BOOT);
+}
+
+/*
+ * apply_early_boot_alternatives() is called from setup_vm() with MMU-off.
+ *
+ * Following requirements should be honoured for it to work correctly:
+ * 1) It should use PC-relative addressing for accessing kernel symbols.
+ * To achieve this we always use GCC cmodel=medany.
+ * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
+ * so disable compiler instrumentation when FTRACE is enabled.
+ *
+ * Currently, the above requirements are honoured by using custom CFLAGS
+ * for alternative.o in kernel/Makefile.
+ */
+void __init apply_early_boot_alternatives(void)
+{
+#ifdef CONFIG_RISCV_ALTERNATIVE_EARLY
+ _apply_alternatives((struct alt_entry *)__alt_start,
+ (struct alt_entry *)__alt_end,
+ RISCV_ALTERNATIVES_EARLY_BOOT);
+#endif
+}
+
+#ifdef CONFIG_MODULES
+void apply_module_alternatives(void *start, size_t length)
+{
+ _apply_alternatives((struct alt_entry *)start,
+ (struct alt_entry *)(start + length),
+ RISCV_ALTERNATIVES_MODULE);
+}
+#endif
diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
new file mode 100644
index 000000000..df9444397
--- /dev/null
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -0,0 +1,477 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#define GENERATING_ASM_OFFSETS
+
+#include <linux/kbuild.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/kvm_host.h>
+#include <asm/thread_info.h>
+#include <asm/ptrace.h>
+#include <asm/cpu_ops_sbi.h>
+#include <asm/suspend.h>
+
+void asm_offsets(void);
+
+void asm_offsets(void)
+{
+ OFFSET(TASK_THREAD_RA, task_struct, thread.ra);
+ OFFSET(TASK_THREAD_SP, task_struct, thread.sp);
+ OFFSET(TASK_THREAD_S0, task_struct, thread.s[0]);
+ OFFSET(TASK_THREAD_S1, task_struct, thread.s[1]);
+ OFFSET(TASK_THREAD_S2, task_struct, thread.s[2]);
+ OFFSET(TASK_THREAD_S3, task_struct, thread.s[3]);
+ OFFSET(TASK_THREAD_S4, task_struct, thread.s[4]);
+ OFFSET(TASK_THREAD_S5, task_struct, thread.s[5]);
+ OFFSET(TASK_THREAD_S6, task_struct, thread.s[6]);
+ OFFSET(TASK_THREAD_S7, task_struct, thread.s[7]);
+ OFFSET(TASK_THREAD_S8, task_struct, thread.s[8]);
+ OFFSET(TASK_THREAD_S9, task_struct, thread.s[9]);
+ OFFSET(TASK_THREAD_S10, task_struct, thread.s[10]);
+ OFFSET(TASK_THREAD_S11, task_struct, thread.s[11]);
+ OFFSET(TASK_TI_FLAGS, task_struct, thread_info.flags);
+ OFFSET(TASK_TI_PREEMPT_COUNT, task_struct, thread_info.preempt_count);
+ OFFSET(TASK_TI_KERNEL_SP, task_struct, thread_info.kernel_sp);
+ OFFSET(TASK_TI_USER_SP, task_struct, thread_info.user_sp);
+
+ OFFSET(TASK_THREAD_F0, task_struct, thread.fstate.f[0]);
+ OFFSET(TASK_THREAD_F1, task_struct, thread.fstate.f[1]);
+ OFFSET(TASK_THREAD_F2, task_struct, thread.fstate.f[2]);
+ OFFSET(TASK_THREAD_F3, task_struct, thread.fstate.f[3]);
+ OFFSET(TASK_THREAD_F4, task_struct, thread.fstate.f[4]);
+ OFFSET(TASK_THREAD_F5, task_struct, thread.fstate.f[5]);
+ OFFSET(TASK_THREAD_F6, task_struct, thread.fstate.f[6]);
+ OFFSET(TASK_THREAD_F7, task_struct, thread.fstate.f[7]);
+ OFFSET(TASK_THREAD_F8, task_struct, thread.fstate.f[8]);
+ OFFSET(TASK_THREAD_F9, task_struct, thread.fstate.f[9]);
+ OFFSET(TASK_THREAD_F10, task_struct, thread.fstate.f[10]);
+ OFFSET(TASK_THREAD_F11, task_struct, thread.fstate.f[11]);
+ OFFSET(TASK_THREAD_F12, task_struct, thread.fstate.f[12]);
+ OFFSET(TASK_THREAD_F13, task_struct, thread.fstate.f[13]);
+ OFFSET(TASK_THREAD_F14, task_struct, thread.fstate.f[14]);
+ OFFSET(TASK_THREAD_F15, task_struct, thread.fstate.f[15]);
+ OFFSET(TASK_THREAD_F16, task_struct, thread.fstate.f[16]);
+ OFFSET(TASK_THREAD_F17, task_struct, thread.fstate.f[17]);
+ OFFSET(TASK_THREAD_F18, task_struct, thread.fstate.f[18]);
+ OFFSET(TASK_THREAD_F19, task_struct, thread.fstate.f[19]);
+ OFFSET(TASK_THREAD_F20, task_struct, thread.fstate.f[20]);
+ OFFSET(TASK_THREAD_F21, task_struct, thread.fstate.f[21]);
+ OFFSET(TASK_THREAD_F22, task_struct, thread.fstate.f[22]);
+ OFFSET(TASK_THREAD_F23, task_struct, thread.fstate.f[23]);
+ OFFSET(TASK_THREAD_F24, task_struct, thread.fstate.f[24]);
+ OFFSET(TASK_THREAD_F25, task_struct, thread.fstate.f[25]);
+ OFFSET(TASK_THREAD_F26, task_struct, thread.fstate.f[26]);
+ OFFSET(TASK_THREAD_F27, task_struct, thread.fstate.f[27]);
+ OFFSET(TASK_THREAD_F28, task_struct, thread.fstate.f[28]);
+ OFFSET(TASK_THREAD_F29, task_struct, thread.fstate.f[29]);
+ OFFSET(TASK_THREAD_F30, task_struct, thread.fstate.f[30]);
+ OFFSET(TASK_THREAD_F31, task_struct, thread.fstate.f[31]);
+ OFFSET(TASK_THREAD_FCSR, task_struct, thread.fstate.fcsr);
+#ifdef CONFIG_STACKPROTECTOR
+ OFFSET(TSK_STACK_CANARY, task_struct, stack_canary);
+#endif
+
+ DEFINE(PT_SIZE, sizeof(struct pt_regs));
+ OFFSET(PT_EPC, pt_regs, epc);
+ OFFSET(PT_RA, pt_regs, ra);
+ OFFSET(PT_FP, pt_regs, s0);
+ OFFSET(PT_S0, pt_regs, s0);
+ OFFSET(PT_S1, pt_regs, s1);
+ OFFSET(PT_S2, pt_regs, s2);
+ OFFSET(PT_S3, pt_regs, s3);
+ OFFSET(PT_S4, pt_regs, s4);
+ OFFSET(PT_S5, pt_regs, s5);
+ OFFSET(PT_S6, pt_regs, s6);
+ OFFSET(PT_S7, pt_regs, s7);
+ OFFSET(PT_S8, pt_regs, s8);
+ OFFSET(PT_S9, pt_regs, s9);
+ OFFSET(PT_S10, pt_regs, s10);
+ OFFSET(PT_S11, pt_regs, s11);
+ OFFSET(PT_SP, pt_regs, sp);
+ OFFSET(PT_TP, pt_regs, tp);
+ OFFSET(PT_A0, pt_regs, a0);
+ OFFSET(PT_A1, pt_regs, a1);
+ OFFSET(PT_A2, pt_regs, a2);
+ OFFSET(PT_A3, pt_regs, a3);
+ OFFSET(PT_A4, pt_regs, a4);
+ OFFSET(PT_A5, pt_regs, a5);
+ OFFSET(PT_A6, pt_regs, a6);
+ OFFSET(PT_A7, pt_regs, a7);
+ OFFSET(PT_T0, pt_regs, t0);
+ OFFSET(PT_T1, pt_regs, t1);
+ OFFSET(PT_T2, pt_regs, t2);
+ OFFSET(PT_T3, pt_regs, t3);
+ OFFSET(PT_T4, pt_regs, t4);
+ OFFSET(PT_T5, pt_regs, t5);
+ OFFSET(PT_T6, pt_regs, t6);
+ OFFSET(PT_GP, pt_regs, gp);
+ OFFSET(PT_ORIG_A0, pt_regs, orig_a0);
+ OFFSET(PT_STATUS, pt_regs, status);
+ OFFSET(PT_BADADDR, pt_regs, badaddr);
+ OFFSET(PT_CAUSE, pt_regs, cause);
+
+ OFFSET(SUSPEND_CONTEXT_REGS, suspend_context, regs);
+
+ OFFSET(KVM_ARCH_GUEST_ZERO, kvm_vcpu_arch, guest_context.zero);
+ OFFSET(KVM_ARCH_GUEST_RA, kvm_vcpu_arch, guest_context.ra);
+ OFFSET(KVM_ARCH_GUEST_SP, kvm_vcpu_arch, guest_context.sp);
+ OFFSET(KVM_ARCH_GUEST_GP, kvm_vcpu_arch, guest_context.gp);
+ OFFSET(KVM_ARCH_GUEST_TP, kvm_vcpu_arch, guest_context.tp);
+ OFFSET(KVM_ARCH_GUEST_T0, kvm_vcpu_arch, guest_context.t0);
+ OFFSET(KVM_ARCH_GUEST_T1, kvm_vcpu_arch, guest_context.t1);
+ OFFSET(KVM_ARCH_GUEST_T2, kvm_vcpu_arch, guest_context.t2);
+ OFFSET(KVM_ARCH_GUEST_S0, kvm_vcpu_arch, guest_context.s0);
+ OFFSET(KVM_ARCH_GUEST_S1, kvm_vcpu_arch, guest_context.s1);
+ OFFSET(KVM_ARCH_GUEST_A0, kvm_vcpu_arch, guest_context.a0);
+ OFFSET(KVM_ARCH_GUEST_A1, kvm_vcpu_arch, guest_context.a1);
+ OFFSET(KVM_ARCH_GUEST_A2, kvm_vcpu_arch, guest_context.a2);
+ OFFSET(KVM_ARCH_GUEST_A3, kvm_vcpu_arch, guest_context.a3);
+ OFFSET(KVM_ARCH_GUEST_A4, kvm_vcpu_arch, guest_context.a4);
+ OFFSET(KVM_ARCH_GUEST_A5, kvm_vcpu_arch, guest_context.a5);
+ OFFSET(KVM_ARCH_GUEST_A6, kvm_vcpu_arch, guest_context.a6);
+ OFFSET(KVM_ARCH_GUEST_A7, kvm_vcpu_arch, guest_context.a7);
+ OFFSET(KVM_ARCH_GUEST_S2, kvm_vcpu_arch, guest_context.s2);
+ OFFSET(KVM_ARCH_GUEST_S3, kvm_vcpu_arch, guest_context.s3);
+ OFFSET(KVM_ARCH_GUEST_S4, kvm_vcpu_arch, guest_context.s4);
+ OFFSET(KVM_ARCH_GUEST_S5, kvm_vcpu_arch, guest_context.s5);
+ OFFSET(KVM_ARCH_GUEST_S6, kvm_vcpu_arch, guest_context.s6);
+ OFFSET(KVM_ARCH_GUEST_S7, kvm_vcpu_arch, guest_context.s7);
+ OFFSET(KVM_ARCH_GUEST_S8, kvm_vcpu_arch, guest_context.s8);
+ OFFSET(KVM_ARCH_GUEST_S9, kvm_vcpu_arch, guest_context.s9);
+ OFFSET(KVM_ARCH_GUEST_S10, kvm_vcpu_arch, guest_context.s10);
+ OFFSET(KVM_ARCH_GUEST_S11, kvm_vcpu_arch, guest_context.s11);
+ OFFSET(KVM_ARCH_GUEST_T3, kvm_vcpu_arch, guest_context.t3);
+ OFFSET(KVM_ARCH_GUEST_T4, kvm_vcpu_arch, guest_context.t4);
+ OFFSET(KVM_ARCH_GUEST_T5, kvm_vcpu_arch, guest_context.t5);
+ OFFSET(KVM_ARCH_GUEST_T6, kvm_vcpu_arch, guest_context.t6);
+ OFFSET(KVM_ARCH_GUEST_SEPC, kvm_vcpu_arch, guest_context.sepc);
+ OFFSET(KVM_ARCH_GUEST_SSTATUS, kvm_vcpu_arch, guest_context.sstatus);
+ OFFSET(KVM_ARCH_GUEST_HSTATUS, kvm_vcpu_arch, guest_context.hstatus);
+ OFFSET(KVM_ARCH_GUEST_SCOUNTEREN, kvm_vcpu_arch, guest_csr.scounteren);
+
+ OFFSET(KVM_ARCH_HOST_ZERO, kvm_vcpu_arch, host_context.zero);
+ OFFSET(KVM_ARCH_HOST_RA, kvm_vcpu_arch, host_context.ra);
+ OFFSET(KVM_ARCH_HOST_SP, kvm_vcpu_arch, host_context.sp);
+ OFFSET(KVM_ARCH_HOST_GP, kvm_vcpu_arch, host_context.gp);
+ OFFSET(KVM_ARCH_HOST_TP, kvm_vcpu_arch, host_context.tp);
+ OFFSET(KVM_ARCH_HOST_T0, kvm_vcpu_arch, host_context.t0);
+ OFFSET(KVM_ARCH_HOST_T1, kvm_vcpu_arch, host_context.t1);
+ OFFSET(KVM_ARCH_HOST_T2, kvm_vcpu_arch, host_context.t2);
+ OFFSET(KVM_ARCH_HOST_S0, kvm_vcpu_arch, host_context.s0);
+ OFFSET(KVM_ARCH_HOST_S1, kvm_vcpu_arch, host_context.s1);
+ OFFSET(KVM_ARCH_HOST_A0, kvm_vcpu_arch, host_context.a0);
+ OFFSET(KVM_ARCH_HOST_A1, kvm_vcpu_arch, host_context.a1);
+ OFFSET(KVM_ARCH_HOST_A2, kvm_vcpu_arch, host_context.a2);
+ OFFSET(KVM_ARCH_HOST_A3, kvm_vcpu_arch, host_context.a3);
+ OFFSET(KVM_ARCH_HOST_A4, kvm_vcpu_arch, host_context.a4);
+ OFFSET(KVM_ARCH_HOST_A5, kvm_vcpu_arch, host_context.a5);
+ OFFSET(KVM_ARCH_HOST_A6, kvm_vcpu_arch, host_context.a6);
+ OFFSET(KVM_ARCH_HOST_A7, kvm_vcpu_arch, host_context.a7);
+ OFFSET(KVM_ARCH_HOST_S2, kvm_vcpu_arch, host_context.s2);
+ OFFSET(KVM_ARCH_HOST_S3, kvm_vcpu_arch, host_context.s3);
+ OFFSET(KVM_ARCH_HOST_S4, kvm_vcpu_arch, host_context.s4);
+ OFFSET(KVM_ARCH_HOST_S5, kvm_vcpu_arch, host_context.s5);
+ OFFSET(KVM_ARCH_HOST_S6, kvm_vcpu_arch, host_context.s6);
+ OFFSET(KVM_ARCH_HOST_S7, kvm_vcpu_arch, host_context.s7);
+ OFFSET(KVM_ARCH_HOST_S8, kvm_vcpu_arch, host_context.s8);
+ OFFSET(KVM_ARCH_HOST_S9, kvm_vcpu_arch, host_context.s9);
+ OFFSET(KVM_ARCH_HOST_S10, kvm_vcpu_arch, host_context.s10);
+ OFFSET(KVM_ARCH_HOST_S11, kvm_vcpu_arch, host_context.s11);
+ OFFSET(KVM_ARCH_HOST_T3, kvm_vcpu_arch, host_context.t3);
+ OFFSET(KVM_ARCH_HOST_T4, kvm_vcpu_arch, host_context.t4);
+ OFFSET(KVM_ARCH_HOST_T5, kvm_vcpu_arch, host_context.t5);
+ OFFSET(KVM_ARCH_HOST_T6, kvm_vcpu_arch, host_context.t6);
+ OFFSET(KVM_ARCH_HOST_SEPC, kvm_vcpu_arch, host_context.sepc);
+ OFFSET(KVM_ARCH_HOST_SSTATUS, kvm_vcpu_arch, host_context.sstatus);
+ OFFSET(KVM_ARCH_HOST_HSTATUS, kvm_vcpu_arch, host_context.hstatus);
+ OFFSET(KVM_ARCH_HOST_SSCRATCH, kvm_vcpu_arch, host_sscratch);
+ OFFSET(KVM_ARCH_HOST_STVEC, kvm_vcpu_arch, host_stvec);
+ OFFSET(KVM_ARCH_HOST_SCOUNTEREN, kvm_vcpu_arch, host_scounteren);
+
+ OFFSET(KVM_ARCH_TRAP_SEPC, kvm_cpu_trap, sepc);
+ OFFSET(KVM_ARCH_TRAP_SCAUSE, kvm_cpu_trap, scause);
+ OFFSET(KVM_ARCH_TRAP_STVAL, kvm_cpu_trap, stval);
+ OFFSET(KVM_ARCH_TRAP_HTVAL, kvm_cpu_trap, htval);
+ OFFSET(KVM_ARCH_TRAP_HTINST, kvm_cpu_trap, htinst);
+
+ /* F extension */
+
+ OFFSET(KVM_ARCH_FP_F_F0, kvm_cpu_context, fp.f.f[0]);
+ OFFSET(KVM_ARCH_FP_F_F1, kvm_cpu_context, fp.f.f[1]);
+ OFFSET(KVM_ARCH_FP_F_F2, kvm_cpu_context, fp.f.f[2]);
+ OFFSET(KVM_ARCH_FP_F_F3, kvm_cpu_context, fp.f.f[3]);
+ OFFSET(KVM_ARCH_FP_F_F4, kvm_cpu_context, fp.f.f[4]);
+ OFFSET(KVM_ARCH_FP_F_F5, kvm_cpu_context, fp.f.f[5]);
+ OFFSET(KVM_ARCH_FP_F_F6, kvm_cpu_context, fp.f.f[6]);
+ OFFSET(KVM_ARCH_FP_F_F7, kvm_cpu_context, fp.f.f[7]);
+ OFFSET(KVM_ARCH_FP_F_F8, kvm_cpu_context, fp.f.f[8]);
+ OFFSET(KVM_ARCH_FP_F_F9, kvm_cpu_context, fp.f.f[9]);
+ OFFSET(KVM_ARCH_FP_F_F10, kvm_cpu_context, fp.f.f[10]);
+ OFFSET(KVM_ARCH_FP_F_F11, kvm_cpu_context, fp.f.f[11]);
+ OFFSET(KVM_ARCH_FP_F_F12, kvm_cpu_context, fp.f.f[12]);
+ OFFSET(KVM_ARCH_FP_F_F13, kvm_cpu_context, fp.f.f[13]);
+ OFFSET(KVM_ARCH_FP_F_F14, kvm_cpu_context, fp.f.f[14]);
+ OFFSET(KVM_ARCH_FP_F_F15, kvm_cpu_context, fp.f.f[15]);
+ OFFSET(KVM_ARCH_FP_F_F16, kvm_cpu_context, fp.f.f[16]);
+ OFFSET(KVM_ARCH_FP_F_F17, kvm_cpu_context, fp.f.f[17]);
+ OFFSET(KVM_ARCH_FP_F_F18, kvm_cpu_context, fp.f.f[18]);
+ OFFSET(KVM_ARCH_FP_F_F19, kvm_cpu_context, fp.f.f[19]);
+ OFFSET(KVM_ARCH_FP_F_F20, kvm_cpu_context, fp.f.f[20]);
+ OFFSET(KVM_ARCH_FP_F_F21, kvm_cpu_context, fp.f.f[21]);
+ OFFSET(KVM_ARCH_FP_F_F22, kvm_cpu_context, fp.f.f[22]);
+ OFFSET(KVM_ARCH_FP_F_F23, kvm_cpu_context, fp.f.f[23]);
+ OFFSET(KVM_ARCH_FP_F_F24, kvm_cpu_context, fp.f.f[24]);
+ OFFSET(KVM_ARCH_FP_F_F25, kvm_cpu_context, fp.f.f[25]);
+ OFFSET(KVM_ARCH_FP_F_F26, kvm_cpu_context, fp.f.f[26]);
+ OFFSET(KVM_ARCH_FP_F_F27, kvm_cpu_context, fp.f.f[27]);
+ OFFSET(KVM_ARCH_FP_F_F28, kvm_cpu_context, fp.f.f[28]);
+ OFFSET(KVM_ARCH_FP_F_F29, kvm_cpu_context, fp.f.f[29]);
+ OFFSET(KVM_ARCH_FP_F_F30, kvm_cpu_context, fp.f.f[30]);
+ OFFSET(KVM_ARCH_FP_F_F31, kvm_cpu_context, fp.f.f[31]);
+ OFFSET(KVM_ARCH_FP_F_FCSR, kvm_cpu_context, fp.f.fcsr);
+
+ /* D extension */
+
+ OFFSET(KVM_ARCH_FP_D_F0, kvm_cpu_context, fp.d.f[0]);
+ OFFSET(KVM_ARCH_FP_D_F1, kvm_cpu_context, fp.d.f[1]);
+ OFFSET(KVM_ARCH_FP_D_F2, kvm_cpu_context, fp.d.f[2]);
+ OFFSET(KVM_ARCH_FP_D_F3, kvm_cpu_context, fp.d.f[3]);
+ OFFSET(KVM_ARCH_FP_D_F4, kvm_cpu_context, fp.d.f[4]);
+ OFFSET(KVM_ARCH_FP_D_F5, kvm_cpu_context, fp.d.f[5]);
+ OFFSET(KVM_ARCH_FP_D_F6, kvm_cpu_context, fp.d.f[6]);
+ OFFSET(KVM_ARCH_FP_D_F7, kvm_cpu_context, fp.d.f[7]);
+ OFFSET(KVM_ARCH_FP_D_F8, kvm_cpu_context, fp.d.f[8]);
+ OFFSET(KVM_ARCH_FP_D_F9, kvm_cpu_context, fp.d.f[9]);
+ OFFSET(KVM_ARCH_FP_D_F10, kvm_cpu_context, fp.d.f[10]);
+ OFFSET(KVM_ARCH_FP_D_F11, kvm_cpu_context, fp.d.f[11]);
+ OFFSET(KVM_ARCH_FP_D_F12, kvm_cpu_context, fp.d.f[12]);
+ OFFSET(KVM_ARCH_FP_D_F13, kvm_cpu_context, fp.d.f[13]);
+ OFFSET(KVM_ARCH_FP_D_F14, kvm_cpu_context, fp.d.f[14]);
+ OFFSET(KVM_ARCH_FP_D_F15, kvm_cpu_context, fp.d.f[15]);
+ OFFSET(KVM_ARCH_FP_D_F16, kvm_cpu_context, fp.d.f[16]);
+ OFFSET(KVM_ARCH_FP_D_F17, kvm_cpu_context, fp.d.f[17]);
+ OFFSET(KVM_ARCH_FP_D_F18, kvm_cpu_context, fp.d.f[18]);
+ OFFSET(KVM_ARCH_FP_D_F19, kvm_cpu_context, fp.d.f[19]);
+ OFFSET(KVM_ARCH_FP_D_F20, kvm_cpu_context, fp.d.f[20]);
+ OFFSET(KVM_ARCH_FP_D_F21, kvm_cpu_context, fp.d.f[21]);
+ OFFSET(KVM_ARCH_FP_D_F22, kvm_cpu_context, fp.d.f[22]);
+ OFFSET(KVM_ARCH_FP_D_F23, kvm_cpu_context, fp.d.f[23]);
+ OFFSET(KVM_ARCH_FP_D_F24, kvm_cpu_context, fp.d.f[24]);
+ OFFSET(KVM_ARCH_FP_D_F25, kvm_cpu_context, fp.d.f[25]);
+ OFFSET(KVM_ARCH_FP_D_F26, kvm_cpu_context, fp.d.f[26]);
+ OFFSET(KVM_ARCH_FP_D_F27, kvm_cpu_context, fp.d.f[27]);
+ OFFSET(KVM_ARCH_FP_D_F28, kvm_cpu_context, fp.d.f[28]);
+ OFFSET(KVM_ARCH_FP_D_F29, kvm_cpu_context, fp.d.f[29]);
+ OFFSET(KVM_ARCH_FP_D_F30, kvm_cpu_context, fp.d.f[30]);
+ OFFSET(KVM_ARCH_FP_D_F31, kvm_cpu_context, fp.d.f[31]);
+ OFFSET(KVM_ARCH_FP_D_FCSR, kvm_cpu_context, fp.d.fcsr);
+
+ /*
+ * THREAD_{F,X}* might be larger than a S-type offset can handle, but
+ * these are used in performance-sensitive assembly so we can't resort
+ * to loading the long immediate every time.
+ */
+ DEFINE(TASK_THREAD_RA_RA,
+ offsetof(struct task_struct, thread.ra)
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_SP_RA,
+ offsetof(struct task_struct, thread.sp)
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S0_RA,
+ offsetof(struct task_struct, thread.s[0])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S1_RA,
+ offsetof(struct task_struct, thread.s[1])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S2_RA,
+ offsetof(struct task_struct, thread.s[2])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S3_RA,
+ offsetof(struct task_struct, thread.s[3])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S4_RA,
+ offsetof(struct task_struct, thread.s[4])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S5_RA,
+ offsetof(struct task_struct, thread.s[5])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S6_RA,
+ offsetof(struct task_struct, thread.s[6])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S7_RA,
+ offsetof(struct task_struct, thread.s[7])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S8_RA,
+ offsetof(struct task_struct, thread.s[8])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S9_RA,
+ offsetof(struct task_struct, thread.s[9])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S10_RA,
+ offsetof(struct task_struct, thread.s[10])
+ - offsetof(struct task_struct, thread.ra)
+ );
+ DEFINE(TASK_THREAD_S11_RA,
+ offsetof(struct task_struct, thread.s[11])
+ - offsetof(struct task_struct, thread.ra)
+ );
+
+ DEFINE(TASK_THREAD_F0_F0,
+ offsetof(struct task_struct, thread.fstate.f[0])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F1_F0,
+ offsetof(struct task_struct, thread.fstate.f[1])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F2_F0,
+ offsetof(struct task_struct, thread.fstate.f[2])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F3_F0,
+ offsetof(struct task_struct, thread.fstate.f[3])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F4_F0,
+ offsetof(struct task_struct, thread.fstate.f[4])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F5_F0,
+ offsetof(struct task_struct, thread.fstate.f[5])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F6_F0,
+ offsetof(struct task_struct, thread.fstate.f[6])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F7_F0,
+ offsetof(struct task_struct, thread.fstate.f[7])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F8_F0,
+ offsetof(struct task_struct, thread.fstate.f[8])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F9_F0,
+ offsetof(struct task_struct, thread.fstate.f[9])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F10_F0,
+ offsetof(struct task_struct, thread.fstate.f[10])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F11_F0,
+ offsetof(struct task_struct, thread.fstate.f[11])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F12_F0,
+ offsetof(struct task_struct, thread.fstate.f[12])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F13_F0,
+ offsetof(struct task_struct, thread.fstate.f[13])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F14_F0,
+ offsetof(struct task_struct, thread.fstate.f[14])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F15_F0,
+ offsetof(struct task_struct, thread.fstate.f[15])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F16_F0,
+ offsetof(struct task_struct, thread.fstate.f[16])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F17_F0,
+ offsetof(struct task_struct, thread.fstate.f[17])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F18_F0,
+ offsetof(struct task_struct, thread.fstate.f[18])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F19_F0,
+ offsetof(struct task_struct, thread.fstate.f[19])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F20_F0,
+ offsetof(struct task_struct, thread.fstate.f[20])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F21_F0,
+ offsetof(struct task_struct, thread.fstate.f[21])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F22_F0,
+ offsetof(struct task_struct, thread.fstate.f[22])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F23_F0,
+ offsetof(struct task_struct, thread.fstate.f[23])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F24_F0,
+ offsetof(struct task_struct, thread.fstate.f[24])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F25_F0,
+ offsetof(struct task_struct, thread.fstate.f[25])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F26_F0,
+ offsetof(struct task_struct, thread.fstate.f[26])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F27_F0,
+ offsetof(struct task_struct, thread.fstate.f[27])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F28_F0,
+ offsetof(struct task_struct, thread.fstate.f[28])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F29_F0,
+ offsetof(struct task_struct, thread.fstate.f[29])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F30_F0,
+ offsetof(struct task_struct, thread.fstate.f[30])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_F31_F0,
+ offsetof(struct task_struct, thread.fstate.f[31])
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+ DEFINE(TASK_THREAD_FCSR_F0,
+ offsetof(struct task_struct, thread.fstate.fcsr)
+ - offsetof(struct task_struct, thread.fstate.f[0])
+ );
+
+ /*
+ * We allocate a pt_regs on the stack when entering the kernel. This
+ * ensures the alignment is sane.
+ */
+ DEFINE(PT_SIZE_ON_STACK, ALIGN(sizeof(struct pt_regs), STACK_ALIGN));
+
+ OFFSET(KERNEL_MAP_VIRT_ADDR, kernel_mapping, virt_addr);
+ OFFSET(SBI_HART_BOOT_TASK_PTR_OFFSET, sbi_hart_boot_data, task_ptr);
+ OFFSET(SBI_HART_BOOT_STACK_PTR_OFFSET, sbi_hart_boot_data, stack_ptr);
+}
diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
new file mode 100644
index 000000000..90deabfe6
--- /dev/null
+++ b/arch/riscv/kernel/cacheinfo.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <asm/cacheinfo.h>
+
+static struct riscv_cacheinfo_ops *rv_cache_ops;
+
+void riscv_set_cacheinfo_ops(struct riscv_cacheinfo_ops *ops)
+{
+ rv_cache_ops = ops;
+}
+EXPORT_SYMBOL_GPL(riscv_set_cacheinfo_ops);
+
+const struct attribute_group *
+cache_get_priv_group(struct cacheinfo *this_leaf)
+{
+ if (rv_cache_ops && rv_cache_ops->get_priv_group)
+ return rv_cache_ops->get_priv_group(this_leaf);
+ return NULL;
+}
+
+static struct cacheinfo *get_cacheinfo(u32 level, enum cache_type type)
+{
+ /*
+ * Using raw_smp_processor_id() elides a preemptability check, but this
+ * is really indicative of a larger problem: the cacheinfo UABI assumes
+ * that cores have a homonogenous view of the cache hierarchy. That
+ * happens to be the case for the current set of RISC-V systems, but
+ * likely won't be true in general. Since there's no way to provide
+ * correct information for these systems via the current UABI we're
+ * just eliding the check for now.
+ */
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(raw_smp_processor_id());
+ struct cacheinfo *this_leaf;
+ int index;
+
+ for (index = 0; index < this_cpu_ci->num_leaves; index++) {
+ this_leaf = this_cpu_ci->info_list + index;
+ if (this_leaf->level == level && this_leaf->type == type)
+ return this_leaf;
+ }
+
+ return NULL;
+}
+
+uintptr_t get_cache_size(u32 level, enum cache_type type)
+{
+ struct cacheinfo *this_leaf = get_cacheinfo(level, type);
+
+ return this_leaf ? this_leaf->size : 0;
+}
+
+uintptr_t get_cache_geometry(u32 level, enum cache_type type)
+{
+ struct cacheinfo *this_leaf = get_cacheinfo(level, type);
+
+ return this_leaf ? (this_leaf->ways_of_associativity << 16 |
+ this_leaf->coherency_line_size) :
+ 0;
+}
+
+static void ci_leaf_init(struct cacheinfo *this_leaf, enum cache_type type,
+ unsigned int level, unsigned int size,
+ unsigned int sets, unsigned int line_size)
+{
+ this_leaf->level = level;
+ this_leaf->type = type;
+ this_leaf->size = size;
+ this_leaf->number_of_sets = sets;
+ this_leaf->coherency_line_size = line_size;
+
+ /*
+ * If the cache is fully associative, there is no need to
+ * check the other properties.
+ */
+ if (sets == 1)
+ return;
+
+ /*
+ * Set the ways number for n-ways associative, make sure
+ * all properties are big than zero.
+ */
+ if (sets > 0 && size > 0 && line_size > 0)
+ this_leaf->ways_of_associativity = (size / sets) / line_size;
+}
+
+static void fill_cacheinfo(struct cacheinfo **this_leaf,
+ struct device_node *node, unsigned int level)
+{
+ unsigned int size, sets, line_size;
+
+ if (!of_property_read_u32(node, "cache-size", &size) &&
+ !of_property_read_u32(node, "cache-block-size", &line_size) &&
+ !of_property_read_u32(node, "cache-sets", &sets)) {
+ ci_leaf_init((*this_leaf)++, CACHE_TYPE_UNIFIED, level, size, sets, line_size);
+ }
+
+ if (!of_property_read_u32(node, "i-cache-size", &size) &&
+ !of_property_read_u32(node, "i-cache-sets", &sets) &&
+ !of_property_read_u32(node, "i-cache-block-size", &line_size)) {
+ ci_leaf_init((*this_leaf)++, CACHE_TYPE_INST, level, size, sets, line_size);
+ }
+
+ if (!of_property_read_u32(node, "d-cache-size", &size) &&
+ !of_property_read_u32(node, "d-cache-sets", &sets) &&
+ !of_property_read_u32(node, "d-cache-block-size", &line_size)) {
+ ci_leaf_init((*this_leaf)++, CACHE_TYPE_DATA, level, size, sets, line_size);
+ }
+}
+
+int init_cache_level(unsigned int cpu)
+{
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ struct device_node *np = of_cpu_device_node_get(cpu);
+ struct device_node *prev = NULL;
+ int levels = 0, leaves = 0, level;
+
+ if (of_property_read_bool(np, "cache-size"))
+ ++leaves;
+ if (of_property_read_bool(np, "i-cache-size"))
+ ++leaves;
+ if (of_property_read_bool(np, "d-cache-size"))
+ ++leaves;
+ if (leaves > 0)
+ levels = 1;
+
+ prev = np;
+ while ((np = of_find_next_cache_node(np))) {
+ of_node_put(prev);
+ prev = np;
+ if (!of_device_is_compatible(np, "cache"))
+ break;
+ if (of_property_read_u32(np, "cache-level", &level))
+ break;
+ if (level <= levels)
+ break;
+ if (of_property_read_bool(np, "cache-size"))
+ ++leaves;
+ if (of_property_read_bool(np, "i-cache-size"))
+ ++leaves;
+ if (of_property_read_bool(np, "d-cache-size"))
+ ++leaves;
+ levels = level;
+ }
+
+ of_node_put(np);
+ this_cpu_ci->num_levels = levels;
+ this_cpu_ci->num_leaves = leaves;
+
+ return 0;
+}
+
+int populate_cache_leaves(unsigned int cpu)
+{
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ struct cacheinfo *this_leaf = this_cpu_ci->info_list;
+ struct device_node *np = of_cpu_device_node_get(cpu);
+ struct device_node *prev = NULL;
+ int levels = 1, level = 1;
+
+ /* Level 1 caches in cpu node */
+ fill_cacheinfo(&this_leaf, np, level);
+
+ /* Next level caches in cache nodes */
+ prev = np;
+ while ((np = of_find_next_cache_node(np))) {
+ of_node_put(prev);
+ prev = np;
+
+ if (!of_device_is_compatible(np, "cache"))
+ break;
+ if (of_property_read_u32(np, "cache-level", &level))
+ break;
+ if (level <= levels)
+ break;
+
+ fill_cacheinfo(&this_leaf, np, level);
+
+ levels = level;
+ }
+ of_node_put(np);
+
+ return 0;
+}
diff --git a/arch/riscv/kernel/compat_signal.c b/arch/riscv/kernel/compat_signal.c
new file mode 100644
index 000000000..6ec4e3425
--- /dev/null
+++ b/arch/riscv/kernel/compat_signal.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/compat.h>
+#include <linux/signal.h>
+#include <linux/uaccess.h>
+#include <linux/syscalls.h>
+#include <linux/linkage.h>
+
+#include <asm/csr.h>
+#include <asm/signal32.h>
+#include <asm/switch_to.h>
+#include <asm/ucontext.h>
+#include <asm/vdso.h>
+
+#define COMPAT_DEBUG_SIG 0
+
+struct compat_sigcontext {
+ struct compat_user_regs_struct sc_regs;
+ union __riscv_fp_state sc_fpregs;
+};
+
+struct compat_ucontext {
+ compat_ulong_t uc_flags;
+ struct compat_ucontext *uc_link;
+ compat_stack_t uc_stack;
+ sigset_t uc_sigmask;
+ /* There's some padding here to allow sigset_t to be expanded in the
+ * future. Though this is unlikely, other architectures put uc_sigmask
+ * at the end of this structure and explicitly state it can be
+ * expanded, so we didn't want to box ourselves in here. */
+ __u8 __unused[1024 / 8 - sizeof(sigset_t)];
+ /* We can't put uc_sigmask at the end of this structure because we need
+ * to be able to expand sigcontext in the future. For example, the
+ * vector ISA extension will almost certainly add ISA state. We want
+ * to ensure all user-visible ISA state can be saved and restored via a
+ * ucontext, so we're putting this at the end in order to allow for
+ * infinite extensibility. Since we know this will be extended and we
+ * assume sigset_t won't be extended an extreme amount, we're
+ * prioritizing this. */
+ struct compat_sigcontext uc_mcontext;
+};
+
+struct compat_rt_sigframe {
+ struct compat_siginfo info;
+ struct compat_ucontext uc;
+};
+
+#ifdef CONFIG_FPU
+static long compat_restore_fp_state(struct pt_regs *regs,
+ union __riscv_fp_state __user *sc_fpregs)
+{
+ long err;
+ struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
+ size_t i;
+
+ err = __copy_from_user(&current->thread.fstate, state, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ fstate_restore(current, regs);
+
+ /* We support no other extension state at this time. */
+ for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
+ u32 value;
+
+ err = __get_user(value, &sc_fpregs->q.reserved[i]);
+ if (unlikely(err))
+ break;
+ if (value != 0)
+ return -EINVAL;
+ }
+
+ return err;
+}
+
+static long compat_save_fp_state(struct pt_regs *regs,
+ union __riscv_fp_state __user *sc_fpregs)
+{
+ long err;
+ struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
+ size_t i;
+
+ fstate_save(current, regs);
+ err = __copy_to_user(state, &current->thread.fstate, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ /* We support no other extension state at this time. */
+ for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
+ err = __put_user(0, &sc_fpregs->q.reserved[i]);
+ if (unlikely(err))
+ break;
+ }
+
+ return err;
+}
+#else
+#define compat_save_fp_state(task, regs) (0)
+#define compat_restore_fp_state(task, regs) (0)
+#endif
+
+static long compat_restore_sigcontext(struct pt_regs *regs,
+ struct compat_sigcontext __user *sc)
+{
+ long err;
+ struct compat_user_regs_struct cregs;
+
+ /* sc_regs is structured the same as the start of pt_regs */
+ err = __copy_from_user(&cregs, &sc->sc_regs, sizeof(sc->sc_regs));
+
+ cregs_to_regs(&cregs, regs);
+
+ /* Restore the floating-point state. */
+ if (has_fpu())
+ err |= compat_restore_fp_state(regs, &sc->sc_fpregs);
+ return err;
+}
+
+COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
+{
+ struct pt_regs *regs = current_pt_regs();
+ struct compat_rt_sigframe __user *frame;
+ struct task_struct *task;
+ sigset_t set;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current->restart_block.fn = do_no_restart_syscall;
+
+ frame = (struct compat_rt_sigframe __user *)regs->sp;
+
+ if (!access_ok(frame, sizeof(*frame)))
+ goto badframe;
+
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ set_current_blocked(&set);
+
+ if (compat_restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ goto badframe;
+
+ if (compat_restore_altstack(&frame->uc.uc_stack))
+ goto badframe;
+
+ return regs->a0;
+
+badframe:
+ task = current;
+ if (show_unhandled_signals) {
+ pr_info_ratelimited(
+ "%s[%d]: bad frame in %s: frame=%p pc=%p sp=%p\n",
+ task->comm, task_pid_nr(task), __func__,
+ frame, (void *)regs->epc, (void *)regs->sp);
+ }
+ force_sig(SIGSEGV);
+ return 0;
+}
+
+static long compat_setup_sigcontext(struct compat_rt_sigframe __user *frame,
+ struct pt_regs *regs)
+{
+ struct compat_sigcontext __user *sc = &frame->uc.uc_mcontext;
+ struct compat_user_regs_struct cregs;
+ long err;
+
+ regs_to_cregs(&cregs, regs);
+
+ /* sc_regs is structured the same as the start of pt_regs */
+ err = __copy_to_user(&sc->sc_regs, &cregs, sizeof(sc->sc_regs));
+ /* Save the floating-point state. */
+ if (has_fpu())
+ err |= compat_save_fp_state(regs, &sc->sc_fpregs);
+ return err;
+}
+
+static inline void __user *compat_get_sigframe(struct ksignal *ksig,
+ struct pt_regs *regs, size_t framesize)
+{
+ unsigned long sp;
+ /* Default to using normal stack */
+ sp = regs->sp;
+
+ /*
+ * If we are on the alternate signal stack and would overflow it, don't.
+ * Return an always-bogus address instead so we will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+ return (void __user __force *)(-1UL);
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ sp = sigsp(sp, ksig) - framesize;
+
+ /* Align the stack frame. */
+ sp &= ~0xfUL;
+
+ return (void __user *)sp;
+}
+
+int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+ struct pt_regs *regs)
+{
+ struct compat_rt_sigframe __user *frame;
+ long err = 0;
+
+ frame = compat_get_sigframe(ksig, regs, sizeof(*frame));
+ if (!access_ok(frame, sizeof(*frame)))
+ return -EFAULT;
+
+ err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(NULL, &frame->uc.uc_link);
+ err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
+ err |= compat_setup_sigcontext(frame, regs);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ return -EFAULT;
+
+ regs->ra = (unsigned long)COMPAT_VDSO_SYMBOL(
+ current->mm->context.vdso, rt_sigreturn);
+
+ /*
+ * Set up registers for signal handler.
+ * Registers that we don't modify keep the value they had from
+ * user-space at the time we took the signal.
+ * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
+ * since some things rely on this (e.g. glibc's debug/segfault.c).
+ */
+ regs->epc = (unsigned long)ksig->ka.sa.sa_handler;
+ regs->sp = (unsigned long)frame;
+ regs->a0 = ksig->sig; /* a0: signal number */
+ regs->a1 = (unsigned long)(&frame->info); /* a1: siginfo pointer */
+ regs->a2 = (unsigned long)(&frame->uc); /* a2: ucontext pointer */
+
+#if COMPAT_DEBUG_SIG
+ pr_info("SIG deliver (%s:%d): sig=%d pc=%p ra=%p sp=%p\n",
+ current->comm, task_pid_nr(current), ksig->sig,
+ (void *)regs->epc, (void *)regs->ra, frame);
+#endif
+
+ return 0;
+}
diff --git a/arch/riscv/kernel/compat_syscall_table.c b/arch/riscv/kernel/compat_syscall_table.c
new file mode 100644
index 000000000..651f2b009
--- /dev/null
+++ b/arch/riscv/kernel/compat_syscall_table.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#define __SYSCALL_COMPAT
+
+#include <linux/compat.h>
+#include <linux/syscalls.h>
+#include <asm-generic/mman-common.h>
+#include <asm-generic/syscalls.h>
+#include <asm/syscall.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+asmlinkage long compat_sys_rt_sigreturn(void);
+
+void * const compat_sys_call_table[__NR_syscalls] = {
+ [0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};
diff --git a/arch/riscv/kernel/compat_vdso/.gitignore b/arch/riscv/kernel/compat_vdso/.gitignore
new file mode 100644
index 000000000..19d83d846
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+compat_vdso.lds
diff --git a/arch/riscv/kernel/compat_vdso/Makefile b/arch/riscv/kernel/compat_vdso/Makefile
new file mode 100644
index 000000000..737c0857b
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/Makefile
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for compat_vdso
+#
+
+# Symbols present in the compat_vdso
+compat_vdso-syms = rt_sigreturn
+compat_vdso-syms += getcpu
+compat_vdso-syms += flush_icache
+
+COMPAT_CC := $(CC)
+COMPAT_LD := $(LD)
+
+# binutils 2.35 does not support the zifencei extension, but in the ISA
+# spec 20191213, G stands for IMAFD_ZICSR_ZIFENCEI.
+ifdef CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
+ COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32
+else
+ COMPAT_CC_FLAGS := -march=rv32imafd -mabi=ilp32
+endif
+COMPAT_LD_FLAGS := -melf32lriscv
+
+# Disable attributes, as they're useless and break the build.
+COMPAT_CC_FLAGS += $(call cc-option,-mno-riscv-attribute)
+COMPAT_CC_FLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
+
+# Files to link into the compat_vdso
+obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o
+
+# Build rules
+targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds
+obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso))
+
+obj-y += compat_vdso.o
+CPPFLAGS_compat_vdso.lds += -P -C -U$(ARCH)
+
+# Disable profiling and instrumentation for VDSO code
+GCOV_PROFILE := n
+KCOV_INSTRUMENT := n
+KASAN_SANITIZE := n
+UBSAN_SANITIZE := n
+
+# Force dependency
+$(obj)/compat_vdso.o: $(obj)/compat_vdso.so
+
+# link rule for the .so file, .lds has to be first
+$(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE
+ $(call if_changed,compat_vdsold)
+LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1 \
+ --build-id=sha1 --hash-style=both --eh-frame-hdr
+
+$(obj-compat_vdso): %.o: %.S FORCE
+ $(call if_changed_dep,compat_vdsoas)
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+# Generate VDSO offsets using helper script
+gen-compat_vdsosym := $(srctree)/$(src)/gen_compat_vdso_offsets.sh
+quiet_cmd_compat_vdsosym = VDSOSYM $@
+ cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@
+
+include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE
+ $(call if_changed,compat_vdsosym)
+
+# actual build commands
+# The DSO images are built using a special linker script
+# Make sure only to export the intended __compat_vdso_xxx symbol offsets.
+quiet_cmd_compat_vdsold = VDSOLD $@
+ cmd_compat_vdsold = $(COMPAT_LD) $(ld_flags) $(COMPAT_LD_FLAGS) -T $(filter-out FORCE,$^) -o $@.tmp && \
+ $(OBJCOPY) $(patsubst %, -G __compat_vdso_%, $(compat_vdso-syms)) $@.tmp $@ && \
+ rm $@.tmp
+
+# actual build commands
+quiet_cmd_compat_vdsoas = VDSOAS $@
+ cmd_compat_vdsoas = $(COMPAT_CC) $(a_flags) $(COMPAT_CC_FLAGS) -c -o $@ $<
+
+# install commands for the unstripped file
+quiet_cmd_compat_vdso_install = INSTALL $@
+ cmd_compat_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/compat_vdso/$@
+
+compat_vdso.so: $(obj)/compat_vdso.so.dbg
+ @mkdir -p $(MODLIB)/compat_vdso
+ $(call cmd,compat_vdso_install)
+
+compat_vdso_install: compat_vdso.so
diff --git a/arch/riscv/kernel/compat_vdso/compat_vdso.S b/arch/riscv/kernel/compat_vdso/compat_vdso.S
new file mode 100644
index 000000000..ffd66237e
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/compat_vdso.S
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define vdso_start compat_vdso_start
+#define vdso_end compat_vdso_end
+
+#define __VDSO_PATH "arch/riscv/kernel/compat_vdso/compat_vdso.so"
+
+#include "../vdso/vdso.S"
diff --git a/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S b/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S
new file mode 100644
index 000000000..c7c9355d3
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/compat_vdso.lds.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../vdso/vdso.lds.S"
diff --git a/arch/riscv/kernel/compat_vdso/flush_icache.S b/arch/riscv/kernel/compat_vdso/flush_icache.S
new file mode 100644
index 000000000..523dd8b96
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/flush_icache.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../vdso/flush_icache.S"
diff --git a/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh b/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh
new file mode 100755
index 000000000..8ac070c78
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/gen_compat_vdso_offsets.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+LC_ALL=C
+sed -n -e 's/^[0]\+\(0[0-9a-fA-F]*\) . \(__vdso_[a-zA-Z0-9_]*\)$/\#define compat\2_offset\t0x\1/p'
diff --git a/arch/riscv/kernel/compat_vdso/getcpu.S b/arch/riscv/kernel/compat_vdso/getcpu.S
new file mode 100644
index 000000000..10f463efe
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/getcpu.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../vdso/getcpu.S"
diff --git a/arch/riscv/kernel/compat_vdso/note.S b/arch/riscv/kernel/compat_vdso/note.S
new file mode 100644
index 000000000..b10312907
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/note.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../vdso/note.S"
diff --git a/arch/riscv/kernel/compat_vdso/rt_sigreturn.S b/arch/riscv/kernel/compat_vdso/rt_sigreturn.S
new file mode 100644
index 000000000..884aada4f
--- /dev/null
+++ b/arch/riscv/kernel/compat_vdso/rt_sigreturn.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../vdso/rt_sigreturn.S"
diff --git a/arch/riscv/kernel/cpu-hotplug.c b/arch/riscv/kernel/cpu-hotplug.c
new file mode 100644
index 000000000..f7a832e3a
--- /dev/null
+++ b/arch/riscv/kernel/cpu-hotplug.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/cpu.h>
+#include <linux/sched/hotplug.h>
+#include <asm/irq.h>
+#include <asm/cpu_ops.h>
+#include <asm/numa.h>
+#include <asm/sbi.h>
+
+bool cpu_has_hotplug(unsigned int cpu)
+{
+ if (cpu_ops[cpu]->cpu_stop)
+ return true;
+
+ return false;
+}
+
+/*
+ * __cpu_disable runs on the processor to be shutdown.
+ */
+int __cpu_disable(void)
+{
+ int ret = 0;
+ unsigned int cpu = smp_processor_id();
+
+ if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_stop)
+ return -EOPNOTSUPP;
+
+ if (cpu_ops[cpu]->cpu_disable)
+ ret = cpu_ops[cpu]->cpu_disable(cpu);
+
+ if (ret)
+ return ret;
+
+ remove_cpu_topology(cpu);
+ numa_remove_cpu(cpu);
+ set_cpu_online(cpu, false);
+ irq_migrate_all_off_this_cpu();
+
+ return ret;
+}
+
+/*
+ * Called on the thread which is asking for a CPU to be shutdown.
+ */
+void __cpu_die(unsigned int cpu)
+{
+ int ret = 0;
+
+ if (!cpu_wait_death(cpu, 5)) {
+ pr_err("CPU %u: didn't die\n", cpu);
+ return;
+ }
+ pr_notice("CPU%u: off\n", cpu);
+
+ /* Verify from the firmware if the cpu is really stopped*/
+ if (cpu_ops[cpu]->cpu_is_stopped)
+ ret = cpu_ops[cpu]->cpu_is_stopped(cpu);
+ if (ret)
+ pr_warn("CPU%d may not have stopped: %d\n", cpu, ret);
+}
+
+/*
+ * Called from the idle thread for the CPU which has been shutdown.
+ */
+void arch_cpu_idle_dead(void)
+{
+ idle_task_exit();
+
+ (void)cpu_report_death();
+
+ cpu_ops[smp_processor_id()]->cpu_stop();
+ /* It should never reach here */
+ BUG();
+}
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
new file mode 100644
index 000000000..0f76181dc
--- /dev/null
+++ b/arch/riscv/kernel/cpu.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <linux/cpu.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/of.h>
+#include <asm/csr.h>
+#include <asm/hwcap.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+#include <asm/pgtable.h>
+
+/*
+ * Returns the hart ID of the given device tree node, or -ENODEV if the node
+ * isn't an enabled and valid RISC-V hart node.
+ */
+int riscv_of_processor_hartid(struct device_node *node, unsigned long *hart)
+{
+ const char *isa;
+
+ if (!of_device_is_compatible(node, "riscv")) {
+ pr_warn("Found incompatible CPU\n");
+ return -ENODEV;
+ }
+
+ *hart = (unsigned long) of_get_cpu_hwid(node, 0);
+ if (*hart == ~0UL) {
+ pr_warn("Found CPU without hart ID\n");
+ return -ENODEV;
+ }
+
+ if (!of_device_is_available(node)) {
+ pr_info("CPU with hartid=%lu is not available\n", *hart);
+ return -ENODEV;
+ }
+
+ if (of_property_read_string(node, "riscv,isa", &isa)) {
+ pr_warn("CPU with hartid=%lu has no \"riscv,isa\" property\n", *hart);
+ return -ENODEV;
+ }
+ if (isa[0] != 'r' || isa[1] != 'v') {
+ pr_warn("CPU with hartid=%lu has an invalid ISA of \"%s\"\n", *hart, isa);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * Find hart ID of the CPU DT node under which given DT node falls.
+ *
+ * To achieve this, we walk up the DT tree until we find an active
+ * RISC-V core (HART) node and extract the cpuid from it.
+ */
+int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
+{
+ for (; node; node = node->parent) {
+ if (of_device_is_compatible(node, "riscv")) {
+ *hartid = (unsigned long)of_get_cpu_hwid(node, 0);
+ if (*hartid == ~0UL) {
+ pr_warn("Found CPU without hart ID\n");
+ return -ENODEV;
+ }
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+#ifdef CONFIG_PROC_FS
+
+struct riscv_cpuinfo {
+ unsigned long mvendorid;
+ unsigned long marchid;
+ unsigned long mimpid;
+};
+static DEFINE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
+
+static int riscv_cpuinfo_starting(unsigned int cpu)
+{
+ struct riscv_cpuinfo *ci = this_cpu_ptr(&riscv_cpuinfo);
+
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+ ci->mvendorid = sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid();
+ ci->marchid = sbi_spec_is_0_1() ? 0 : sbi_get_marchid();
+ ci->mimpid = sbi_spec_is_0_1() ? 0 : sbi_get_mimpid();
+#elif IS_ENABLED(CONFIG_RISCV_M_MODE)
+ ci->mvendorid = csr_read(CSR_MVENDORID);
+ ci->marchid = csr_read(CSR_MARCHID);
+ ci->mimpid = csr_read(CSR_MIMPID);
+#else
+ ci->mvendorid = 0;
+ ci->marchid = 0;
+ ci->mimpid = 0;
+#endif
+
+ return 0;
+}
+
+static int __init riscv_cpuinfo_init(void)
+{
+ int ret;
+
+ ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "riscv/cpuinfo:starting",
+ riscv_cpuinfo_starting, NULL);
+ if (ret < 0) {
+ pr_err("cpuinfo: failed to register hotplug callbacks.\n");
+ return ret;
+ }
+
+ return 0;
+}
+device_initcall(riscv_cpuinfo_init);
+
+#define __RISCV_ISA_EXT_DATA(UPROP, EXTID) \
+ { \
+ .uprop = #UPROP, \
+ .isa_ext_id = EXTID, \
+ }
+/*
+ * Here are the ordering rules of extension naming defined by RISC-V
+ * specification :
+ * 1. All extensions should be separated from other multi-letter extensions
+ * by an underscore.
+ * 2. The first letter following the 'Z' conventionally indicates the most
+ * closely related alphabetical extension category, IMAFDQLCBKJTPVH.
+ * If multiple 'Z' extensions are named, they should be ordered first
+ * by category, then alphabetically within a category.
+ * 3. Standard supervisor-level extensions (starts with 'S') should be
+ * listed after standard unprivileged extensions. If multiple
+ * supervisor-level extensions are listed, they should be ordered
+ * alphabetically.
+ * 4. Non-standard extensions (starts with 'X') must be listed after all
+ * standard extensions. They must be separated from other multi-letter
+ * extensions by an underscore.
+ */
+static struct riscv_isa_ext_data isa_ext_arr[] = {
+ __RISCV_ISA_EXT_DATA(sscofpmf, RISCV_ISA_EXT_SSCOFPMF),
+ __RISCV_ISA_EXT_DATA(sstc, RISCV_ISA_EXT_SSTC),
+ __RISCV_ISA_EXT_DATA(svinval, RISCV_ISA_EXT_SVINVAL),
+ __RISCV_ISA_EXT_DATA(svpbmt, RISCV_ISA_EXT_SVPBMT),
+ __RISCV_ISA_EXT_DATA(zicbom, RISCV_ISA_EXT_ZICBOM),
+ __RISCV_ISA_EXT_DATA(zihintpause, RISCV_ISA_EXT_ZIHINTPAUSE),
+ __RISCV_ISA_EXT_DATA("", RISCV_ISA_EXT_MAX),
+};
+
+static void print_isa_ext(struct seq_file *f)
+{
+ struct riscv_isa_ext_data *edata;
+ int i = 0, arr_sz;
+
+ arr_sz = ARRAY_SIZE(isa_ext_arr) - 1;
+
+ /* No extension support available */
+ if (arr_sz <= 0)
+ return;
+
+ for (i = 0; i <= arr_sz; i++) {
+ edata = &isa_ext_arr[i];
+ if (!__riscv_isa_extension_available(NULL, edata->isa_ext_id))
+ continue;
+ seq_printf(f, "_%s", edata->uprop);
+ }
+}
+
+/*
+ * These are the only valid base (single letter) ISA extensions as per the spec.
+ * It also specifies the canonical order in which it appears in the spec.
+ * Some of the extension may just be a place holder for now (B, K, P, J).
+ * This should be updated once corresponding extensions are ratified.
+ */
+static const char base_riscv_exts[13] = "imafdqcbkjpvh";
+
+static void print_isa(struct seq_file *f, const char *isa)
+{
+ int i;
+
+ seq_puts(f, "isa\t\t: ");
+ /* Print the rv[64/32] part */
+ seq_write(f, isa, 4);
+ for (i = 0; i < sizeof(base_riscv_exts); i++) {
+ if (__riscv_isa_extension_available(NULL, base_riscv_exts[i] - 'a'))
+ /* Print only enabled the base ISA extensions */
+ seq_write(f, &base_riscv_exts[i], 1);
+ }
+ print_isa_ext(f);
+ seq_puts(f, "\n");
+}
+
+static void print_mmu(struct seq_file *f)
+{
+ char sv_type[16];
+
+#ifdef CONFIG_MMU
+#if defined(CONFIG_32BIT)
+ strncpy(sv_type, "sv32", 5);
+#elif defined(CONFIG_64BIT)
+ if (pgtable_l5_enabled)
+ strncpy(sv_type, "sv57", 5);
+ else if (pgtable_l4_enabled)
+ strncpy(sv_type, "sv48", 5);
+ else
+ strncpy(sv_type, "sv39", 5);
+#endif
+#else
+ strncpy(sv_type, "none", 5);
+#endif /* CONFIG_MMU */
+ seq_printf(f, "mmu\t\t: %s\n", sv_type);
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ if (*pos == nr_cpu_ids)
+ return NULL;
+
+ *pos = cpumask_next(*pos - 1, cpu_online_mask);
+ if ((*pos) < nr_cpu_ids)
+ return (void *)(uintptr_t)(1 + *pos);
+ return NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ (*pos)++;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+static int c_show(struct seq_file *m, void *v)
+{
+ unsigned long cpu_id = (unsigned long)v - 1;
+ struct device_node *node = of_get_cpu_node(cpu_id, NULL);
+ struct riscv_cpuinfo *ci = per_cpu_ptr(&riscv_cpuinfo, cpu_id);
+ const char *compat, *isa;
+
+ seq_printf(m, "processor\t: %lu\n", cpu_id);
+ seq_printf(m, "hart\t\t: %lu\n", cpuid_to_hartid_map(cpu_id));
+ if (!of_property_read_string(node, "riscv,isa", &isa))
+ print_isa(m, isa);
+ print_mmu(m);
+ if (!of_property_read_string(node, "compatible", &compat)
+ && strcmp(compat, "riscv"))
+ seq_printf(m, "uarch\t\t: %s\n", compat);
+ seq_printf(m, "mvendorid\t: 0x%lx\n", ci->mvendorid);
+ seq_printf(m, "marchid\t\t: 0x%lx\n", ci->marchid);
+ seq_printf(m, "mimpid\t\t: 0x%lx\n", ci->mimpid);
+ seq_puts(m, "\n");
+ of_node_put(node);
+
+ return 0;
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = c_show
+};
+
+#endif /* CONFIG_PROC_FS */
diff --git a/arch/riscv/kernel/cpu_ops.c b/arch/riscv/kernel/cpu_ops.c
new file mode 100644
index 000000000..eb479a88a
--- /dev/null
+++ b/arch/riscv/kernel/cpu_ops.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/of.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <asm/cpu_ops.h>
+#include <asm/cpu_ops_sbi.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
+
+extern const struct cpu_operations cpu_ops_sbi;
+#ifndef CONFIG_RISCV_BOOT_SPINWAIT
+const struct cpu_operations cpu_ops_spinwait = {
+ .name = "",
+ .cpu_prepare = NULL,
+ .cpu_start = NULL,
+};
+#endif
+
+void __init cpu_set_ops(int cpuid)
+{
+#if IS_ENABLED(CONFIG_RISCV_SBI)
+ if (sbi_probe_extension(SBI_EXT_HSM)) {
+ if (!cpuid)
+ pr_info("SBI HSM extension detected\n");
+ cpu_ops[cpuid] = &cpu_ops_sbi;
+ } else
+#endif
+ cpu_ops[cpuid] = &cpu_ops_spinwait;
+}
diff --git a/arch/riscv/kernel/cpu_ops_sbi.c b/arch/riscv/kernel/cpu_ops_sbi.c
new file mode 100644
index 000000000..efa0f0816
--- /dev/null
+++ b/arch/riscv/kernel/cpu_ops_sbi.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * HSM extension and cpu_ops implementation.
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/sched/task_stack.h>
+#include <asm/cpu_ops.h>
+#include <asm/cpu_ops_sbi.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+extern char secondary_start_sbi[];
+const struct cpu_operations cpu_ops_sbi;
+
+/*
+ * Ordered booting via HSM brings one cpu at a time. However, cpu hotplug can
+ * be invoked from multiple threads in parallel. Define a per cpu data
+ * to handle that.
+ */
+static DEFINE_PER_CPU(struct sbi_hart_boot_data, boot_data);
+
+static int sbi_hsm_hart_start(unsigned long hartid, unsigned long saddr,
+ unsigned long priv)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_START,
+ hartid, saddr, priv, 0, 0, 0);
+ if (ret.error)
+ return sbi_err_map_linux_errno(ret.error);
+ else
+ return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int sbi_hsm_hart_stop(void)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STOP, 0, 0, 0, 0, 0, 0);
+
+ if (ret.error)
+ return sbi_err_map_linux_errno(ret.error);
+ else
+ return 0;
+}
+
+static int sbi_hsm_hart_get_status(unsigned long hartid)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STATUS,
+ hartid, 0, 0, 0, 0, 0);
+ if (ret.error)
+ return sbi_err_map_linux_errno(ret.error);
+ else
+ return ret.value;
+}
+#endif
+
+static int sbi_cpu_start(unsigned int cpuid, struct task_struct *tidle)
+{
+ unsigned long boot_addr = __pa_symbol(secondary_start_sbi);
+ unsigned long hartid = cpuid_to_hartid_map(cpuid);
+ unsigned long hsm_data;
+ struct sbi_hart_boot_data *bdata = &per_cpu(boot_data, cpuid);
+
+ /* Make sure tidle is updated */
+ smp_mb();
+ bdata->task_ptr = tidle;
+ bdata->stack_ptr = task_stack_page(tidle) + THREAD_SIZE;
+ /* Make sure boot data is updated */
+ smp_mb();
+ hsm_data = __pa(bdata);
+ return sbi_hsm_hart_start(hartid, boot_addr, hsm_data);
+}
+
+static int sbi_cpu_prepare(unsigned int cpuid)
+{
+ if (!cpu_ops_sbi.cpu_start) {
+ pr_err("cpu start method not defined for CPU [%d]\n", cpuid);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int sbi_cpu_disable(unsigned int cpuid)
+{
+ if (!cpu_ops_sbi.cpu_stop)
+ return -EOPNOTSUPP;
+ return 0;
+}
+
+static void sbi_cpu_stop(void)
+{
+ int ret;
+
+ ret = sbi_hsm_hart_stop();
+ pr_crit("Unable to stop the cpu %u (%d)\n", smp_processor_id(), ret);
+}
+
+static int sbi_cpu_is_stopped(unsigned int cpuid)
+{
+ int rc;
+ unsigned long hartid = cpuid_to_hartid_map(cpuid);
+
+ rc = sbi_hsm_hart_get_status(hartid);
+
+ if (rc == SBI_HSM_STATE_STOPPED)
+ return 0;
+ return rc;
+}
+#endif
+
+const struct cpu_operations cpu_ops_sbi = {
+ .name = "sbi",
+ .cpu_prepare = sbi_cpu_prepare,
+ .cpu_start = sbi_cpu_start,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_disable = sbi_cpu_disable,
+ .cpu_stop = sbi_cpu_stop,
+ .cpu_is_stopped = sbi_cpu_is_stopped,
+#endif
+};
diff --git a/arch/riscv/kernel/cpu_ops_spinwait.c b/arch/riscv/kernel/cpu_ops_spinwait.c
new file mode 100644
index 000000000..d98d19226
--- /dev/null
+++ b/arch/riscv/kernel/cpu_ops_spinwait.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/errno.h>
+#include <linux/of.h>
+#include <linux/string.h>
+#include <linux/sched/task_stack.h>
+#include <asm/cpu_ops.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+#include "head.h"
+
+const struct cpu_operations cpu_ops_spinwait;
+void *__cpu_spinwait_stack_pointer[NR_CPUS] __section(".data");
+void *__cpu_spinwait_task_pointer[NR_CPUS] __section(".data");
+
+static void cpu_update_secondary_bootdata(unsigned int cpuid,
+ struct task_struct *tidle)
+{
+ unsigned long hartid = cpuid_to_hartid_map(cpuid);
+
+ /*
+ * The hartid must be less than NR_CPUS to avoid out-of-bound access
+ * errors for __cpu_spinwait_stack/task_pointer. That is not always possible
+ * for platforms with discontiguous hartid numbering scheme. That's why
+ * spinwait booting is not the recommended approach for any platforms
+ * booting Linux in S-mode and can be disabled in the future.
+ */
+ if (hartid == INVALID_HARTID || hartid >= (unsigned long) NR_CPUS)
+ return;
+
+ /* Make sure tidle is updated */
+ smp_mb();
+ WRITE_ONCE(__cpu_spinwait_stack_pointer[hartid],
+ task_stack_page(tidle) + THREAD_SIZE);
+ WRITE_ONCE(__cpu_spinwait_task_pointer[hartid], tidle);
+}
+
+static int spinwait_cpu_prepare(unsigned int cpuid)
+{
+ if (!cpu_ops_spinwait.cpu_start) {
+ pr_err("cpu start method not defined for CPU [%d]\n", cpuid);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static int spinwait_cpu_start(unsigned int cpuid, struct task_struct *tidle)
+{
+ /*
+ * In this protocol, all cpus boot on their own accord. _start
+ * selects the first cpu to boot the kernel and causes the remainder
+ * of the cpus to spin in a loop waiting for their stack pointer to be
+ * setup by that main cpu. Writing to bootdata
+ * (i.e __cpu_spinwait_stack_pointer) signals to the spinning cpus that they
+ * can continue the boot process.
+ */
+ cpu_update_secondary_bootdata(cpuid, tidle);
+
+ return 0;
+}
+
+const struct cpu_operations cpu_ops_spinwait = {
+ .name = "spinwait",
+ .cpu_prepare = spinwait_cpu_prepare,
+ .cpu_start = spinwait_cpu_start,
+};
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
new file mode 100644
index 000000000..fd1238df6
--- /dev/null
+++ b/arch/riscv/kernel/cpufeature.c
@@ -0,0 +1,327 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copied from arch/arm64/kernel/cpufeature.c
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/bitmap.h>
+#include <linux/ctype.h>
+#include <linux/libfdt.h>
+#include <linux/memory.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <asm/alternative.h>
+#include <asm/cacheflush.h>
+#include <asm/errata_list.h>
+#include <asm/hwcap.h>
+#include <asm/patch.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/smp.h>
+#include <asm/switch_to.h>
+
+#define NUM_ALPHA_EXTS ('z' - 'a' + 1)
+
+unsigned long elf_hwcap __read_mostly;
+
+/* Host ISA bitmap */
+static DECLARE_BITMAP(riscv_isa, RISCV_ISA_EXT_MAX) __read_mostly;
+
+DEFINE_STATIC_KEY_ARRAY_FALSE(riscv_isa_ext_keys, RISCV_ISA_EXT_KEY_MAX);
+EXPORT_SYMBOL(riscv_isa_ext_keys);
+
+/**
+ * riscv_isa_extension_base() - Get base extension word
+ *
+ * @isa_bitmap: ISA bitmap to use
+ * Return: base extension word as unsigned long value
+ *
+ * NOTE: If isa_bitmap is NULL then Host ISA bitmap will be used.
+ */
+unsigned long riscv_isa_extension_base(const unsigned long *isa_bitmap)
+{
+ if (!isa_bitmap)
+ return riscv_isa[0];
+ return isa_bitmap[0];
+}
+EXPORT_SYMBOL_GPL(riscv_isa_extension_base);
+
+/**
+ * __riscv_isa_extension_available() - Check whether given extension
+ * is available or not
+ *
+ * @isa_bitmap: ISA bitmap to use
+ * @bit: bit position of the desired extension
+ * Return: true or false
+ *
+ * NOTE: If isa_bitmap is NULL then Host ISA bitmap will be used.
+ */
+bool __riscv_isa_extension_available(const unsigned long *isa_bitmap, int bit)
+{
+ const unsigned long *bmap = (isa_bitmap) ? isa_bitmap : riscv_isa;
+
+ if (bit >= RISCV_ISA_EXT_MAX)
+ return false;
+
+ return test_bit(bit, bmap) ? true : false;
+}
+EXPORT_SYMBOL_GPL(__riscv_isa_extension_available);
+
+void __init riscv_fill_hwcap(void)
+{
+ struct device_node *node;
+ const char *isa;
+ char print_str[NUM_ALPHA_EXTS + 1];
+ int i, j, rc;
+ static unsigned long isa2hwcap[256] = {0};
+ unsigned long hartid;
+
+ isa2hwcap['i'] = isa2hwcap['I'] = COMPAT_HWCAP_ISA_I;
+ isa2hwcap['m'] = isa2hwcap['M'] = COMPAT_HWCAP_ISA_M;
+ isa2hwcap['a'] = isa2hwcap['A'] = COMPAT_HWCAP_ISA_A;
+ isa2hwcap['f'] = isa2hwcap['F'] = COMPAT_HWCAP_ISA_F;
+ isa2hwcap['d'] = isa2hwcap['D'] = COMPAT_HWCAP_ISA_D;
+ isa2hwcap['c'] = isa2hwcap['C'] = COMPAT_HWCAP_ISA_C;
+
+ elf_hwcap = 0;
+
+ bitmap_zero(riscv_isa, RISCV_ISA_EXT_MAX);
+
+ for_each_of_cpu_node(node) {
+ unsigned long this_hwcap = 0;
+ DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX);
+ const char *temp;
+
+ rc = riscv_of_processor_hartid(node, &hartid);
+ if (rc < 0)
+ continue;
+
+ if (of_property_read_string(node, "riscv,isa", &isa)) {
+ pr_warn("Unable to find \"riscv,isa\" devicetree entry\n");
+ continue;
+ }
+
+ temp = isa;
+#if IS_ENABLED(CONFIG_32BIT)
+ if (!strncmp(isa, "rv32", 4))
+ isa += 4;
+#elif IS_ENABLED(CONFIG_64BIT)
+ if (!strncmp(isa, "rv64", 4))
+ isa += 4;
+#endif
+ /* The riscv,isa DT property must start with rv64 or rv32 */
+ if (temp == isa)
+ continue;
+ bitmap_zero(this_isa, RISCV_ISA_EXT_MAX);
+ for (; *isa; ++isa) {
+ const char *ext = isa++;
+ const char *ext_end = isa;
+ bool ext_long = false, ext_err = false;
+
+ switch (*ext) {
+ case 's':
+ /**
+ * Workaround for invalid single-letter 's' & 'u'(QEMU).
+ * No need to set the bit in riscv_isa as 's' & 'u' are
+ * not valid ISA extensions. It works until multi-letter
+ * extension starting with "Su" appears.
+ */
+ if (ext[-1] != '_' && ext[1] == 'u') {
+ ++isa;
+ ext_err = true;
+ break;
+ }
+ fallthrough;
+ case 'x':
+ case 'z':
+ ext_long = true;
+ /* Multi-letter extension must be delimited */
+ for (; *isa && *isa != '_'; ++isa)
+ if (unlikely(!islower(*isa)
+ && !isdigit(*isa)))
+ ext_err = true;
+ /* Parse backwards */
+ ext_end = isa;
+ if (unlikely(ext_err))
+ break;
+ if (!isdigit(ext_end[-1]))
+ break;
+ /* Skip the minor version */
+ while (isdigit(*--ext_end))
+ ;
+ if (ext_end[0] != 'p'
+ || !isdigit(ext_end[-1])) {
+ /* Advance it to offset the pre-decrement */
+ ++ext_end;
+ break;
+ }
+ /* Skip the major version */
+ while (isdigit(*--ext_end))
+ ;
+ ++ext_end;
+ break;
+ default:
+ if (unlikely(!islower(*ext))) {
+ ext_err = true;
+ break;
+ }
+ /* Find next extension */
+ if (!isdigit(*isa))
+ break;
+ /* Skip the minor version */
+ while (isdigit(*++isa))
+ ;
+ if (*isa != 'p')
+ break;
+ if (!isdigit(*++isa)) {
+ --isa;
+ break;
+ }
+ /* Skip the major version */
+ while (isdigit(*++isa))
+ ;
+ break;
+ }
+ if (*isa != '_')
+ --isa;
+
+#define SET_ISA_EXT_MAP(name, bit) \
+ do { \
+ if ((ext_end - ext == sizeof(name) - 1) && \
+ !memcmp(ext, name, sizeof(name) - 1)) \
+ set_bit(bit, this_isa); \
+ } while (false) \
+
+ if (unlikely(ext_err))
+ continue;
+ if (!ext_long) {
+ this_hwcap |= isa2hwcap[(unsigned char)(*ext)];
+ set_bit(*ext - 'a', this_isa);
+ } else {
+ SET_ISA_EXT_MAP("sscofpmf", RISCV_ISA_EXT_SSCOFPMF);
+ SET_ISA_EXT_MAP("svpbmt", RISCV_ISA_EXT_SVPBMT);
+ SET_ISA_EXT_MAP("zicbom", RISCV_ISA_EXT_ZICBOM);
+ SET_ISA_EXT_MAP("zihintpause", RISCV_ISA_EXT_ZIHINTPAUSE);
+ SET_ISA_EXT_MAP("sstc", RISCV_ISA_EXT_SSTC);
+ SET_ISA_EXT_MAP("svinval", RISCV_ISA_EXT_SVINVAL);
+ }
+#undef SET_ISA_EXT_MAP
+ }
+
+ /*
+ * All "okay" hart should have same isa. Set HWCAP based on
+ * common capabilities of every "okay" hart, in case they don't
+ * have.
+ */
+ if (elf_hwcap)
+ elf_hwcap &= this_hwcap;
+ else
+ elf_hwcap = this_hwcap;
+
+ if (bitmap_empty(riscv_isa, RISCV_ISA_EXT_MAX))
+ bitmap_copy(riscv_isa, this_isa, RISCV_ISA_EXT_MAX);
+ else
+ bitmap_and(riscv_isa, riscv_isa, this_isa, RISCV_ISA_EXT_MAX);
+ }
+
+ /* We don't support systems with F but without D, so mask those out
+ * here. */
+ if ((elf_hwcap & COMPAT_HWCAP_ISA_F) && !(elf_hwcap & COMPAT_HWCAP_ISA_D)) {
+ pr_info("This kernel does not support systems with F but not D\n");
+ elf_hwcap &= ~COMPAT_HWCAP_ISA_F;
+ }
+
+ memset(print_str, 0, sizeof(print_str));
+ for (i = 0, j = 0; i < NUM_ALPHA_EXTS; i++)
+ if (riscv_isa[0] & BIT_MASK(i))
+ print_str[j++] = (char)('a' + i);
+ pr_info("riscv: base ISA extensions %s\n", print_str);
+
+ memset(print_str, 0, sizeof(print_str));
+ for (i = 0, j = 0; i < NUM_ALPHA_EXTS; i++)
+ if (elf_hwcap & BIT_MASK(i))
+ print_str[j++] = (char)('a' + i);
+ pr_info("riscv: ELF capabilities %s\n", print_str);
+
+ for_each_set_bit(i, riscv_isa, RISCV_ISA_EXT_MAX) {
+ j = riscv_isa_ext2key(i);
+ if (j >= 0)
+ static_branch_enable(&riscv_isa_ext_keys[j]);
+ }
+}
+
+#ifdef CONFIG_RISCV_ALTERNATIVE
+static bool __init_or_module cpufeature_probe_svpbmt(unsigned int stage)
+{
+ if (!IS_ENABLED(CONFIG_RISCV_ISA_SVPBMT))
+ return false;
+
+ if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
+ return false;
+
+ return riscv_isa_extension_available(NULL, SVPBMT);
+}
+
+static bool __init_or_module cpufeature_probe_zicbom(unsigned int stage)
+{
+ if (!IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM))
+ return false;
+
+ if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
+ return false;
+
+ if (!riscv_isa_extension_available(NULL, ZICBOM))
+ return false;
+
+ riscv_noncoherent_supported();
+ return true;
+}
+
+/*
+ * Probe presence of individual extensions.
+ *
+ * This code may also be executed before kernel relocation, so we cannot use
+ * addresses generated by the address-of operator as they won't be valid in
+ * this context.
+ */
+static u32 __init_or_module cpufeature_probe(unsigned int stage)
+{
+ u32 cpu_req_feature = 0;
+
+ if (cpufeature_probe_svpbmt(stage))
+ cpu_req_feature |= BIT(CPUFEATURE_SVPBMT);
+
+ if (cpufeature_probe_zicbom(stage))
+ cpu_req_feature |= BIT(CPUFEATURE_ZICBOM);
+
+ return cpu_req_feature;
+}
+
+void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
+ struct alt_entry *end,
+ unsigned int stage)
+{
+ u32 cpu_req_feature = cpufeature_probe(stage);
+ struct alt_entry *alt;
+ u32 tmp;
+
+ for (alt = begin; alt < end; alt++) {
+ if (alt->vendor_id != 0)
+ continue;
+ if (alt->errata_id >= CPUFEATURE_NUMBER) {
+ WARN(1, "This feature id:%d is not in kernel cpufeature list",
+ alt->errata_id);
+ continue;
+ }
+
+ tmp = (1U << alt->errata_id);
+ if (cpu_req_feature & tmp) {
+ mutex_lock(&text_mutex);
+ patch_text_nosync(alt->old_ptr, alt->alt_ptr, alt->alt_len);
+ mutex_unlock(&text_mutex);
+ }
+ }
+}
+#endif
diff --git a/arch/riscv/kernel/crash_dump.c b/arch/riscv/kernel/crash_dump.c
new file mode 100644
index 000000000..ea2158cee
--- /dev/null
+++ b/arch/riscv/kernel/crash_dump.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This code comes from arch/arm64/kernel/crash_dump.c
+ * Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ * Copyright (C) 2017 Linaro Limited
+ */
+
+#include <linux/crash_dump.h>
+#include <linux/io.h>
+#include <linux/uio.h>
+
+ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
+ size_t csize, unsigned long offset)
+{
+ void *vaddr;
+
+ if (!csize)
+ return 0;
+
+ vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
+ if (!vaddr)
+ return -ENOMEM;
+
+ csize = copy_to_iter(vaddr + offset, csize, iter);
+
+ memunmap(vaddr);
+ return csize;
+}
diff --git a/arch/riscv/kernel/crash_save_regs.S b/arch/riscv/kernel/crash_save_regs.S
new file mode 100644
index 000000000..b2a1908c0
--- /dev/null
+++ b/arch/riscv/kernel/crash_save_regs.S
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020 FORTH-ICS/CARV
+ * Nick Kossifidis <mick@ics.forth.gr>
+ */
+
+#include <asm/asm.h> /* For RISCV_* and REG_* macros */
+#include <asm/csr.h> /* For CSR_* macros */
+#include <asm/asm-offsets.h> /* For offsets on pt_regs */
+#include <linux/linkage.h> /* For SYM_* macros */
+
+.section ".text"
+SYM_CODE_START(riscv_crash_save_regs)
+ REG_S ra, PT_RA(a0) /* x1 */
+ REG_S sp, PT_SP(a0) /* x2 */
+ REG_S gp, PT_GP(a0) /* x3 */
+ REG_S tp, PT_TP(a0) /* x4 */
+ REG_S t0, PT_T0(a0) /* x5 */
+ REG_S t1, PT_T1(a0) /* x6 */
+ REG_S t2, PT_T2(a0) /* x7 */
+ REG_S s0, PT_S0(a0) /* x8/fp */
+ REG_S s1, PT_S1(a0) /* x9 */
+ REG_S a0, PT_A0(a0) /* x10 */
+ REG_S a1, PT_A1(a0) /* x11 */
+ REG_S a2, PT_A2(a0) /* x12 */
+ REG_S a3, PT_A3(a0) /* x13 */
+ REG_S a4, PT_A4(a0) /* x14 */
+ REG_S a5, PT_A5(a0) /* x15 */
+ REG_S a6, PT_A6(a0) /* x16 */
+ REG_S a7, PT_A7(a0) /* x17 */
+ REG_S s2, PT_S2(a0) /* x18 */
+ REG_S s3, PT_S3(a0) /* x19 */
+ REG_S s4, PT_S4(a0) /* x20 */
+ REG_S s5, PT_S5(a0) /* x21 */
+ REG_S s6, PT_S6(a0) /* x22 */
+ REG_S s7, PT_S7(a0) /* x23 */
+ REG_S s8, PT_S8(a0) /* x24 */
+ REG_S s9, PT_S9(a0) /* x25 */
+ REG_S s10, PT_S10(a0) /* x26 */
+ REG_S s11, PT_S11(a0) /* x27 */
+ REG_S t3, PT_T3(a0) /* x28 */
+ REG_S t4, PT_T4(a0) /* x29 */
+ REG_S t5, PT_T5(a0) /* x30 */
+ REG_S t6, PT_T6(a0) /* x31 */
+
+ csrr t1, CSR_STATUS
+ auipc t2, 0x0
+ csrr t3, CSR_TVAL
+ csrr t4, CSR_CAUSE
+
+ REG_S t1, PT_STATUS(a0)
+ REG_S t2, PT_EPC(a0)
+ REG_S t3, PT_BADADDR(a0)
+ REG_S t4, PT_CAUSE(a0)
+ ret
+SYM_CODE_END(riscv_crash_save_regs)
diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S
new file mode 100644
index 000000000..8e733aa48
--- /dev/null
+++ b/arch/riscv/kernel/efi-header.S
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ * Adapted from arch/arm64/kernel/efi-header.S
+ */
+
+#include <linux/pe.h>
+#include <linux/sizes.h>
+
+ .macro __EFI_PE_HEADER
+ .long PE_MAGIC
+coff_header:
+#ifdef CONFIG_64BIT
+ .short IMAGE_FILE_MACHINE_RISCV64 // Machine
+#else
+ .short IMAGE_FILE_MACHINE_RISCV32 // Machine
+#endif
+ .short section_count // NumberOfSections
+ .long 0 // TimeDateStamp
+ .long 0 // PointerToSymbolTable
+ .long 0 // NumberOfSymbols
+ .short section_table - optional_header // SizeOfOptionalHeader
+ .short IMAGE_FILE_DEBUG_STRIPPED | \
+ IMAGE_FILE_EXECUTABLE_IMAGE | \
+ IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics
+
+optional_header:
+#ifdef CONFIG_64BIT
+ .short PE_OPT_MAGIC_PE32PLUS // PE32+ format
+#else
+ .short PE_OPT_MAGIC_PE32 // PE32 format
+#endif
+ .byte 0x02 // MajorLinkerVersion
+ .byte 0x14 // MinorLinkerVersion
+ .long __pecoff_text_end - efi_header_end // SizeOfCode
+ .long __pecoff_data_virt_size // SizeOfInitializedData
+ .long 0 // SizeOfUninitializedData
+ .long __efistub_efi_pe_entry - _start // AddressOfEntryPoint
+ .long efi_header_end - _start // BaseOfCode
+#ifdef CONFIG_32BIT
+ .long __pecoff_text_end - _start // BaseOfData
+#endif
+
+extra_header_fields:
+ .quad 0 // ImageBase
+ .long PECOFF_SECTION_ALIGNMENT // SectionAlignment
+ .long PECOFF_FILE_ALIGNMENT // FileAlignment
+ .short 0 // MajorOperatingSystemVersion
+ .short 0 // MinorOperatingSystemVersion
+ .short LINUX_EFISTUB_MAJOR_VERSION // MajorImageVersion
+ .short LINUX_EFISTUB_MINOR_VERSION // MinorImageVersion
+ .short 0 // MajorSubsystemVersion
+ .short 0 // MinorSubsystemVersion
+ .long 0 // Win32VersionValue
+
+ .long _end - _start // SizeOfImage
+
+ // Everything before the kernel image is considered part of the header
+ .long efi_header_end - _start // SizeOfHeaders
+ .long 0 // CheckSum
+ .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem
+ .short 0 // DllCharacteristics
+ .quad 0 // SizeOfStackReserve
+ .quad 0 // SizeOfStackCommit
+ .quad 0 // SizeOfHeapReserve
+ .quad 0 // SizeOfHeapCommit
+ .long 0 // LoaderFlags
+ .long (section_table - .) / 8 // NumberOfRvaAndSizes
+
+ .quad 0 // ExportTable
+ .quad 0 // ImportTable
+ .quad 0 // ResourceTable
+ .quad 0 // ExceptionTable
+ .quad 0 // CertificationTable
+ .quad 0 // BaseRelocationTable
+
+ // Section table
+section_table:
+ .ascii ".text\0\0\0"
+ .long __pecoff_text_end - efi_header_end // VirtualSize
+ .long efi_header_end - _start // VirtualAddress
+ .long __pecoff_text_end - efi_header_end // SizeOfRawData
+ .long efi_header_end - _start // PointerToRawData
+
+ .long 0 // PointerToRelocations
+ .long 0 // PointerToLineNumbers
+ .short 0 // NumberOfRelocations
+ .short 0 // NumberOfLineNumbers
+ .long IMAGE_SCN_CNT_CODE | \
+ IMAGE_SCN_MEM_READ | \
+ IMAGE_SCN_MEM_EXECUTE // Characteristics
+
+ .ascii ".data\0\0\0"
+ .long __pecoff_data_virt_size // VirtualSize
+ .long __pecoff_text_end - _start // VirtualAddress
+ .long __pecoff_data_raw_size // SizeOfRawData
+ .long __pecoff_text_end - _start // PointerToRawData
+
+ .long 0 // PointerToRelocations
+ .long 0 // PointerToLineNumbers
+ .short 0 // NumberOfRelocations
+ .short 0 // NumberOfLineNumbers
+ .long IMAGE_SCN_CNT_INITIALIZED_DATA | \
+ IMAGE_SCN_MEM_READ | \
+ IMAGE_SCN_MEM_WRITE // Characteristics
+
+ .set section_count, (. - section_table) / 40
+
+ .balign 0x1000
+efi_header_end:
+ .endm
diff --git a/arch/riscv/kernel/efi.c b/arch/riscv/kernel/efi.c
new file mode 100644
index 000000000..1aa540350
--- /dev/null
+++ b/arch/riscv/kernel/efi.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ * Adapted from arch/arm64/kernel/efi.c
+ */
+
+#include <linux/efi.h>
+#include <linux/init.h>
+
+#include <asm/efi.h>
+#include <asm/pgtable.h>
+#include <asm/pgtable-bits.h>
+
+/*
+ * Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
+ * executable, everything else can be mapped with the XN bits
+ * set. Also take the new (optional) RO/XP bits into account.
+ */
+static __init pgprot_t efimem_to_pgprot_map(efi_memory_desc_t *md)
+{
+ u64 attr = md->attribute;
+ u32 type = md->type;
+
+ if (type == EFI_MEMORY_MAPPED_IO)
+ return PAGE_KERNEL;
+
+ /* R-- */
+ if ((attr & (EFI_MEMORY_XP | EFI_MEMORY_RO)) ==
+ (EFI_MEMORY_XP | EFI_MEMORY_RO))
+ return PAGE_KERNEL_READ;
+
+ /* R-X */
+ if (attr & EFI_MEMORY_RO)
+ return PAGE_KERNEL_READ_EXEC;
+
+ /* RW- */
+ if (((attr & (EFI_MEMORY_RP | EFI_MEMORY_WP | EFI_MEMORY_XP)) ==
+ EFI_MEMORY_XP) ||
+ type != EFI_RUNTIME_SERVICES_CODE)
+ return PAGE_KERNEL;
+
+ /* RWX */
+ return PAGE_KERNEL_EXEC;
+}
+
+int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
+{
+ pgprot_t prot = __pgprot(pgprot_val(efimem_to_pgprot_map(md)) &
+ ~(_PAGE_GLOBAL));
+ int i;
+
+ /* RISC-V maps one page at a time */
+ for (i = 0; i < md->num_pages; i++)
+ create_pgd_mapping(mm->pgd, md->virt_addr + i * PAGE_SIZE,
+ md->phys_addr + i * PAGE_SIZE,
+ PAGE_SIZE, prot);
+ return 0;
+}
+
+static int __init set_permissions(pte_t *ptep, unsigned long addr, void *data)
+{
+ efi_memory_desc_t *md = data;
+ pte_t pte = READ_ONCE(*ptep);
+ unsigned long val;
+
+ if (md->attribute & EFI_MEMORY_RO) {
+ val = pte_val(pte) & ~_PAGE_WRITE;
+ val |= _PAGE_READ;
+ pte = __pte(val);
+ }
+ if (md->attribute & EFI_MEMORY_XP) {
+ val = pte_val(pte) & ~_PAGE_EXEC;
+ pte = __pte(val);
+ }
+ set_pte(ptep, pte);
+
+ return 0;
+}
+
+int __init efi_set_mapping_permissions(struct mm_struct *mm,
+ efi_memory_desc_t *md)
+{
+ BUG_ON(md->type != EFI_RUNTIME_SERVICES_CODE &&
+ md->type != EFI_RUNTIME_SERVICES_DATA);
+
+ /*
+ * Calling apply_to_page_range() is only safe on regions that are
+ * guaranteed to be mapped down to pages. Since we are only called
+ * for regions that have been mapped using efi_create_mapping() above
+ * (and this is checked by the generic Memory Attributes table parsing
+ * routines), there is no need to check that again here.
+ */
+ return apply_to_page_range(mm, md->virt_addr,
+ md->num_pages << EFI_PAGE_SHIFT,
+ set_permissions, md);
+}
diff --git a/arch/riscv/kernel/elf_kexec.c b/arch/riscv/kernel/elf_kexec.c
new file mode 100644
index 000000000..b3b96ff46
--- /dev/null
+++ b/arch/riscv/kernel/elf_kexec.c
@@ -0,0 +1,469 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Load ELF vmlinux file for the kexec_file_load syscall.
+ *
+ * Copyright (C) 2021 Huawei Technologies Co, Ltd.
+ *
+ * Author: Liao Chang (liaochang1@huawei.com)
+ *
+ * Based on kexec-tools' kexec-elf-riscv.c, heavily modified
+ * for kernel.
+ */
+
+#define pr_fmt(fmt) "kexec_image: " fmt
+
+#include <linux/elf.h>
+#include <linux/kexec.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/libfdt.h>
+#include <linux/types.h>
+#include <linux/memblock.h>
+#include <asm/setup.h>
+
+int arch_kimage_file_post_load_cleanup(struct kimage *image)
+{
+ kvfree(image->arch.fdt);
+ image->arch.fdt = NULL;
+
+ vfree(image->elf_headers);
+ image->elf_headers = NULL;
+ image->elf_headers_sz = 0;
+
+ return kexec_image_post_load_cleanup_default(image);
+}
+
+static int riscv_kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
+ struct kexec_elf_info *elf_info, unsigned long old_pbase,
+ unsigned long new_pbase)
+{
+ int i;
+ int ret = 0;
+ size_t size;
+ struct kexec_buf kbuf;
+ const struct elf_phdr *phdr;
+
+ kbuf.image = image;
+
+ for (i = 0; i < ehdr->e_phnum; i++) {
+ phdr = &elf_info->proghdrs[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ size = phdr->p_filesz;
+ if (size > phdr->p_memsz)
+ size = phdr->p_memsz;
+
+ kbuf.buffer = (void *) elf_info->buffer + phdr->p_offset;
+ kbuf.bufsz = size;
+ kbuf.buf_align = phdr->p_align;
+ kbuf.mem = phdr->p_paddr - old_pbase + new_pbase;
+ kbuf.memsz = phdr->p_memsz;
+ kbuf.top_down = false;
+ ret = kexec_add_buffer(&kbuf);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Go through the available phsyical memory regions and find one that hold
+ * an image of the specified size.
+ */
+static int elf_find_pbase(struct kimage *image, unsigned long kernel_len,
+ struct elfhdr *ehdr, struct kexec_elf_info *elf_info,
+ unsigned long *old_pbase, unsigned long *new_pbase)
+{
+ int i;
+ int ret;
+ struct kexec_buf kbuf;
+ const struct elf_phdr *phdr;
+ unsigned long lowest_paddr = ULONG_MAX;
+ unsigned long lowest_vaddr = ULONG_MAX;
+
+ for (i = 0; i < ehdr->e_phnum; i++) {
+ phdr = &elf_info->proghdrs[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ if (lowest_paddr > phdr->p_paddr)
+ lowest_paddr = phdr->p_paddr;
+
+ if (lowest_vaddr > phdr->p_vaddr)
+ lowest_vaddr = phdr->p_vaddr;
+ }
+
+ kbuf.image = image;
+ kbuf.buf_min = lowest_paddr;
+ kbuf.buf_max = ULONG_MAX;
+
+ /*
+ * Current riscv boot protocol requires 2MB alignment for
+ * RV64 and 4MB alignment for RV32
+ *
+ */
+ kbuf.buf_align = PMD_SIZE;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ kbuf.memsz = ALIGN(kernel_len, PAGE_SIZE);
+ kbuf.top_down = false;
+ ret = arch_kexec_locate_mem_hole(&kbuf);
+ if (!ret) {
+ *old_pbase = lowest_paddr;
+ *new_pbase = kbuf.mem;
+ image->start = ehdr->e_entry - lowest_vaddr + kbuf.mem;
+ }
+ return ret;
+}
+
+static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
+{
+ unsigned int *nr_ranges = arg;
+
+ (*nr_ranges)++;
+ return 0;
+}
+
+static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg)
+{
+ struct crash_mem *cmem = arg;
+
+ cmem->ranges[cmem->nr_ranges].start = res->start;
+ cmem->ranges[cmem->nr_ranges].end = res->end;
+ cmem->nr_ranges++;
+
+ return 0;
+}
+
+static int prepare_elf_headers(void **addr, unsigned long *sz)
+{
+ struct crash_mem *cmem;
+ unsigned int nr_ranges;
+ int ret;
+
+ nr_ranges = 1; /* For exclusion of crashkernel region */
+ walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
+
+ cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL);
+ if (!cmem)
+ return -ENOMEM;
+
+ cmem->max_nr_ranges = nr_ranges;
+ cmem->nr_ranges = 0;
+ ret = walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback);
+ if (ret)
+ goto out;
+
+ /* Exclude crashkernel region */
+ ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
+ if (!ret)
+ ret = crash_prepare_elf64_headers(cmem, true, addr, sz);
+
+out:
+ kfree(cmem);
+ return ret;
+}
+
+static char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
+ unsigned long cmdline_len)
+{
+ int elfcorehdr_strlen;
+ char *cmdline_ptr;
+
+ cmdline_ptr = kzalloc(COMMAND_LINE_SIZE, GFP_KERNEL);
+ if (!cmdline_ptr)
+ return NULL;
+
+ elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
+ image->elf_load_addr);
+
+ if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
+ pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
+ kfree(cmdline_ptr);
+ return NULL;
+ }
+
+ memcpy(cmdline_ptr + elfcorehdr_strlen, cmdline, cmdline_len);
+ /* Ensure it's nul terminated */
+ cmdline_ptr[COMMAND_LINE_SIZE - 1] = '\0';
+ return cmdline_ptr;
+}
+
+static void *elf_kexec_load(struct kimage *image, char *kernel_buf,
+ unsigned long kernel_len, char *initrd,
+ unsigned long initrd_len, char *cmdline,
+ unsigned long cmdline_len)
+{
+ int ret;
+ unsigned long old_kernel_pbase = ULONG_MAX;
+ unsigned long new_kernel_pbase = 0UL;
+ unsigned long initrd_pbase = 0UL;
+ unsigned long headers_sz;
+ unsigned long kernel_start;
+ void *fdt, *headers;
+ struct elfhdr ehdr;
+ struct kexec_buf kbuf;
+ struct kexec_elf_info elf_info;
+ char *modified_cmdline = NULL;
+
+ ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = elf_find_pbase(image, kernel_len, &ehdr, &elf_info,
+ &old_kernel_pbase, &new_kernel_pbase);
+ if (ret)
+ goto out;
+ kernel_start = image->start;
+ pr_notice("The entry point of kernel at 0x%lx\n", image->start);
+
+ /* Add the kernel binary to the image */
+ ret = riscv_kexec_elf_load(image, &ehdr, &elf_info,
+ old_kernel_pbase, new_kernel_pbase);
+ if (ret)
+ goto out;
+
+ kbuf.image = image;
+ kbuf.buf_min = new_kernel_pbase + kernel_len;
+ kbuf.buf_max = ULONG_MAX;
+
+ /* Add elfcorehdr */
+ if (image->type == KEXEC_TYPE_CRASH) {
+ ret = prepare_elf_headers(&headers, &headers_sz);
+ if (ret) {
+ pr_err("Preparing elf core header failed\n");
+ goto out;
+ }
+
+ kbuf.buffer = headers;
+ kbuf.bufsz = headers_sz;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ kbuf.memsz = headers_sz;
+ kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
+ kbuf.top_down = true;
+
+ ret = kexec_add_buffer(&kbuf);
+ if (ret) {
+ vfree(headers);
+ goto out;
+ }
+ image->elf_headers = headers;
+ image->elf_load_addr = kbuf.mem;
+ image->elf_headers_sz = headers_sz;
+
+ pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+
+ /* Setup cmdline for kdump kernel case */
+ modified_cmdline = setup_kdump_cmdline(image, cmdline,
+ cmdline_len);
+ if (!modified_cmdline) {
+ pr_err("Setting up cmdline for kdump kernel failed\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ cmdline = modified_cmdline;
+ }
+
+#ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
+ /* Add purgatory to the image */
+ kbuf.top_down = true;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ ret = kexec_load_purgatory(image, &kbuf);
+ if (ret) {
+ pr_err("Error loading purgatory ret=%d\n", ret);
+ goto out;
+ }
+ ret = kexec_purgatory_get_set_symbol(image, "riscv_kernel_entry",
+ &kernel_start,
+ sizeof(kernel_start), 0);
+ if (ret)
+ pr_err("Error update purgatory ret=%d\n", ret);
+#endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
+
+ /* Add the initrd to the image */
+ if (initrd != NULL) {
+ kbuf.buffer = initrd;
+ kbuf.bufsz = kbuf.memsz = initrd_len;
+ kbuf.buf_align = PAGE_SIZE;
+ kbuf.top_down = true;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ ret = kexec_add_buffer(&kbuf);
+ if (ret)
+ goto out;
+ initrd_pbase = kbuf.mem;
+ pr_notice("Loaded initrd at 0x%lx\n", initrd_pbase);
+ }
+
+ /* Add the DTB to the image */
+ fdt = of_kexec_alloc_and_setup_fdt(image, initrd_pbase,
+ initrd_len, cmdline, 0);
+ if (!fdt) {
+ pr_err("Error setting up the new device tree.\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ fdt_pack(fdt);
+ kbuf.buffer = fdt;
+ kbuf.bufsz = kbuf.memsz = fdt_totalsize(fdt);
+ kbuf.buf_align = PAGE_SIZE;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ kbuf.top_down = true;
+ ret = kexec_add_buffer(&kbuf);
+ if (ret) {
+ pr_err("Error add DTB kbuf ret=%d\n", ret);
+ goto out_free_fdt;
+ }
+ /* Cache the fdt buffer address for memory cleanup */
+ image->arch.fdt = fdt;
+ pr_notice("Loaded device tree at 0x%lx\n", kbuf.mem);
+ goto out;
+
+out_free_fdt:
+ kvfree(fdt);
+out:
+ kfree(modified_cmdline);
+ kexec_free_elf_info(&elf_info);
+ return ret ? ERR_PTR(ret) : NULL;
+}
+
+#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
+#define RISCV_IMM_BITS 12
+#define RISCV_IMM_REACH (1LL << RISCV_IMM_BITS)
+#define RISCV_CONST_HIGH_PART(x) \
+ (((x) + (RISCV_IMM_REACH >> 1)) & ~(RISCV_IMM_REACH - 1))
+#define RISCV_CONST_LOW_PART(x) ((x) - RISCV_CONST_HIGH_PART(x))
+
+#define ENCODE_ITYPE_IMM(x) \
+ (RV_X(x, 0, 12) << 20)
+#define ENCODE_BTYPE_IMM(x) \
+ ((RV_X(x, 1, 4) << 8) | (RV_X(x, 5, 6) << 25) | \
+ (RV_X(x, 11, 1) << 7) | (RV_X(x, 12, 1) << 31))
+#define ENCODE_UTYPE_IMM(x) \
+ (RV_X(x, 12, 20) << 12)
+#define ENCODE_JTYPE_IMM(x) \
+ ((RV_X(x, 1, 10) << 21) | (RV_X(x, 11, 1) << 20) | \
+ (RV_X(x, 12, 8) << 12) | (RV_X(x, 20, 1) << 31))
+#define ENCODE_CBTYPE_IMM(x) \
+ ((RV_X(x, 1, 2) << 3) | (RV_X(x, 3, 2) << 10) | (RV_X(x, 5, 1) << 2) | \
+ (RV_X(x, 6, 2) << 5) | (RV_X(x, 8, 1) << 12))
+#define ENCODE_CJTYPE_IMM(x) \
+ ((RV_X(x, 1, 3) << 3) | (RV_X(x, 4, 1) << 11) | (RV_X(x, 5, 1) << 2) | \
+ (RV_X(x, 6, 1) << 7) | (RV_X(x, 7, 1) << 6) | (RV_X(x, 8, 2) << 9) | \
+ (RV_X(x, 10, 1) << 8) | (RV_X(x, 11, 1) << 12))
+#define ENCODE_UJTYPE_IMM(x) \
+ (ENCODE_UTYPE_IMM(RISCV_CONST_HIGH_PART(x)) | \
+ (ENCODE_ITYPE_IMM(RISCV_CONST_LOW_PART(x)) << 32))
+#define ENCODE_UITYPE_IMM(x) \
+ (ENCODE_UTYPE_IMM(x) | (ENCODE_ITYPE_IMM(x) << 32))
+
+#define CLEAN_IMM(type, x) \
+ ((~ENCODE_##type##_IMM((uint64_t)(-1))) & (x))
+
+int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
+ Elf_Shdr *section,
+ const Elf_Shdr *relsec,
+ const Elf_Shdr *symtab)
+{
+ const char *strtab, *name, *shstrtab;
+ const Elf_Shdr *sechdrs;
+ Elf64_Rela *relas;
+ int i, r_type;
+
+ /* String & section header string table */
+ sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
+ strtab = (char *)pi->ehdr + sechdrs[symtab->sh_link].sh_offset;
+ shstrtab = (char *)pi->ehdr + sechdrs[pi->ehdr->e_shstrndx].sh_offset;
+
+ relas = (void *)pi->ehdr + relsec->sh_offset;
+
+ for (i = 0; i < relsec->sh_size / sizeof(*relas); i++) {
+ const Elf_Sym *sym; /* symbol to relocate */
+ unsigned long addr; /* final location after relocation */
+ unsigned long val; /* relocated symbol value */
+ unsigned long sec_base; /* relocated symbol value */
+ void *loc; /* tmp location to modify */
+
+ sym = (void *)pi->ehdr + symtab->sh_offset;
+ sym += ELF64_R_SYM(relas[i].r_info);
+
+ if (sym->st_name)
+ name = strtab + sym->st_name;
+ else
+ name = shstrtab + sechdrs[sym->st_shndx].sh_name;
+
+ loc = pi->purgatory_buf;
+ loc += section->sh_offset;
+ loc += relas[i].r_offset;
+
+ if (sym->st_shndx == SHN_ABS)
+ sec_base = 0;
+ else if (sym->st_shndx >= pi->ehdr->e_shnum) {
+ pr_err("Invalid section %d for symbol %s\n",
+ sym->st_shndx, name);
+ return -ENOEXEC;
+ } else
+ sec_base = pi->sechdrs[sym->st_shndx].sh_addr;
+
+ val = sym->st_value;
+ val += sec_base;
+ val += relas[i].r_addend;
+
+ addr = section->sh_addr + relas[i].r_offset;
+
+ r_type = ELF64_R_TYPE(relas[i].r_info);
+
+ switch (r_type) {
+ case R_RISCV_BRANCH:
+ *(u32 *)loc = CLEAN_IMM(BTYPE, *(u32 *)loc) |
+ ENCODE_BTYPE_IMM(val - addr);
+ break;
+ case R_RISCV_JAL:
+ *(u32 *)loc = CLEAN_IMM(JTYPE, *(u32 *)loc) |
+ ENCODE_JTYPE_IMM(val - addr);
+ break;
+ /*
+ * With no R_RISCV_PCREL_LO12_S, R_RISCV_PCREL_LO12_I
+ * sym is expected to be next to R_RISCV_PCREL_HI20
+ * in purgatory relsec. Handle it like R_RISCV_CALL
+ * sym, instead of searching the whole relsec.
+ */
+ case R_RISCV_PCREL_HI20:
+ case R_RISCV_CALL_PLT:
+ case R_RISCV_CALL:
+ *(u64 *)loc = CLEAN_IMM(UITYPE, *(u64 *)loc) |
+ ENCODE_UJTYPE_IMM(val - addr);
+ break;
+ case R_RISCV_RVC_BRANCH:
+ *(u32 *)loc = CLEAN_IMM(CBTYPE, *(u32 *)loc) |
+ ENCODE_CBTYPE_IMM(val - addr);
+ break;
+ case R_RISCV_RVC_JUMP:
+ *(u32 *)loc = CLEAN_IMM(CJTYPE, *(u32 *)loc) |
+ ENCODE_CJTYPE_IMM(val - addr);
+ break;
+ case R_RISCV_ADD32:
+ *(u32 *)loc += val;
+ break;
+ case R_RISCV_SUB32:
+ *(u32 *)loc -= val;
+ break;
+ /* It has been applied by R_RISCV_PCREL_HI20 sym */
+ case R_RISCV_PCREL_LO12_I:
+ case R_RISCV_ALIGN:
+ case R_RISCV_RELAX:
+ break;
+ default:
+ pr_err("Unknown rela relocation: %d\n", r_type);
+ return -ENOEXEC;
+ }
+ }
+ return 0;
+}
+
+const struct kexec_file_ops elf_kexec_ops = {
+ .probe = kexec_elf_probe,
+ .load = elf_kexec_load,
+};
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
new file mode 100644
index 000000000..3221a9e5f
--- /dev/null
+++ b/arch/riscv/kernel/entry.S
@@ -0,0 +1,607 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/unistd.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+#include <asm/errata_list.h>
+
+#if !IS_ENABLED(CONFIG_PREEMPTION)
+.set resume_kernel, restore_all
+#endif
+
+ENTRY(handle_exception)
+ /*
+ * If coming from userspace, preserve the user thread pointer and load
+ * the kernel thread pointer. If we came from the kernel, the scratch
+ * register will contain 0, and we should continue on the current TP.
+ */
+ csrrw tp, CSR_SCRATCH, tp
+ bnez tp, _save_context
+
+_restore_kernel_tpsp:
+ csrr tp, CSR_SCRATCH
+ REG_S sp, TASK_TI_KERNEL_SP(tp)
+
+#ifdef CONFIG_VMAP_STACK
+ addi sp, sp, -(PT_SIZE_ON_STACK)
+ srli sp, sp, THREAD_SHIFT
+ andi sp, sp, 0x1
+ bnez sp, handle_kernel_stack_overflow
+ REG_L sp, TASK_TI_KERNEL_SP(tp)
+#endif
+
+_save_context:
+ REG_S sp, TASK_TI_USER_SP(tp)
+ REG_L sp, TASK_TI_KERNEL_SP(tp)
+ addi sp, sp, -(PT_SIZE_ON_STACK)
+ REG_S x1, PT_RA(sp)
+ REG_S x3, PT_GP(sp)
+ REG_S x5, PT_T0(sp)
+ REG_S x6, PT_T1(sp)
+ REG_S x7, PT_T2(sp)
+ REG_S x8, PT_S0(sp)
+ REG_S x9, PT_S1(sp)
+ REG_S x10, PT_A0(sp)
+ REG_S x11, PT_A1(sp)
+ REG_S x12, PT_A2(sp)
+ REG_S x13, PT_A3(sp)
+ REG_S x14, PT_A4(sp)
+ REG_S x15, PT_A5(sp)
+ REG_S x16, PT_A6(sp)
+ REG_S x17, PT_A7(sp)
+ REG_S x18, PT_S2(sp)
+ REG_S x19, PT_S3(sp)
+ REG_S x20, PT_S4(sp)
+ REG_S x21, PT_S5(sp)
+ REG_S x22, PT_S6(sp)
+ REG_S x23, PT_S7(sp)
+ REG_S x24, PT_S8(sp)
+ REG_S x25, PT_S9(sp)
+ REG_S x26, PT_S10(sp)
+ REG_S x27, PT_S11(sp)
+ REG_S x28, PT_T3(sp)
+ REG_S x29, PT_T4(sp)
+ REG_S x30, PT_T5(sp)
+ REG_S x31, PT_T6(sp)
+
+ /*
+ * Disable user-mode memory access as it should only be set in the
+ * actual user copy routines.
+ *
+ * Disable the FPU to detect illegal usage of floating point in kernel
+ * space.
+ */
+ li t0, SR_SUM | SR_FS
+
+ REG_L s0, TASK_TI_USER_SP(tp)
+ csrrc s1, CSR_STATUS, t0
+ csrr s2, CSR_EPC
+ csrr s3, CSR_TVAL
+ csrr s4, CSR_CAUSE
+ csrr s5, CSR_SCRATCH
+ REG_S s0, PT_SP(sp)
+ REG_S s1, PT_STATUS(sp)
+ REG_S s2, PT_EPC(sp)
+ REG_S s3, PT_BADADDR(sp)
+ REG_S s4, PT_CAUSE(sp)
+ REG_S s5, PT_TP(sp)
+
+ /*
+ * Set the scratch register to 0, so that if a recursive exception
+ * occurs, the exception vector knows it came from the kernel
+ */
+ csrw CSR_SCRATCH, x0
+
+ /* Load the global pointer */
+.option push
+.option norelax
+ la gp, __global_pointer$
+.option pop
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+ call __trace_hardirqs_off
+#endif
+
+#ifdef CONFIG_CONTEXT_TRACKING_USER
+ /* If previous state is in user mode, call user_exit_callable(). */
+ li a0, SR_PP
+ and a0, s1, a0
+ bnez a0, skip_context_tracking
+ call user_exit_callable
+skip_context_tracking:
+#endif
+
+ /*
+ * MSB of cause differentiates between
+ * interrupts and exceptions
+ */
+ bge s4, zero, 1f
+
+ la ra, ret_from_exception
+
+ /* Handle interrupts */
+ move a0, sp /* pt_regs */
+ la a1, generic_handle_arch_irq
+ jr a1
+1:
+ /*
+ * Exceptions run with interrupts enabled or disabled depending on the
+ * state of SR_PIE in m/sstatus.
+ */
+ andi t0, s1, SR_PIE
+ beqz t0, 1f
+ /* kprobes, entered via ebreak, must have interrupts disabled. */
+ li t0, EXC_BREAKPOINT
+ beq s4, t0, 1f
+#ifdef CONFIG_TRACE_IRQFLAGS
+ call __trace_hardirqs_on
+#endif
+ csrs CSR_STATUS, SR_IE
+
+1:
+ la ra, ret_from_exception
+ /* Handle syscalls */
+ li t0, EXC_SYSCALL
+ beq s4, t0, handle_syscall
+
+ /* Handle other exceptions */
+ slli t0, s4, RISCV_LGPTR
+ la t1, excp_vect_table
+ la t2, excp_vect_table_end
+ move a0, sp /* pt_regs */
+ add t0, t1, t0
+ /* Check if exception code lies within bounds */
+ bgeu t0, t2, 1f
+ REG_L t0, 0(t0)
+ jr t0
+1:
+ tail do_trap_unknown
+
+handle_syscall:
+#ifdef CONFIG_RISCV_M_MODE
+ /*
+ * When running is M-Mode (no MMU config), MPIE does not get set.
+ * As a result, we need to force enable interrupts here because
+ * handle_exception did not do set SR_IE as it always sees SR_PIE
+ * being cleared.
+ */
+ csrs CSR_STATUS, SR_IE
+#endif
+#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING_USER)
+ /* Recover a0 - a7 for system calls */
+ REG_L a0, PT_A0(sp)
+ REG_L a1, PT_A1(sp)
+ REG_L a2, PT_A2(sp)
+ REG_L a3, PT_A3(sp)
+ REG_L a4, PT_A4(sp)
+ REG_L a5, PT_A5(sp)
+ REG_L a6, PT_A6(sp)
+ REG_L a7, PT_A7(sp)
+#endif
+ /* save the initial A0 value (needed in signal handlers) */
+ REG_S a0, PT_ORIG_A0(sp)
+ /*
+ * Advance SEPC to avoid executing the original
+ * scall instruction on sret
+ */
+ addi s2, s2, 0x4
+ REG_S s2, PT_EPC(sp)
+ /* Trace syscalls, but only if requested by the user. */
+ REG_L t0, TASK_TI_FLAGS(tp)
+ andi t0, t0, _TIF_SYSCALL_WORK
+ bnez t0, handle_syscall_trace_enter
+check_syscall_nr:
+ /* Check to make sure we don't jump to a bogus syscall number. */
+ li t0, __NR_syscalls
+ la s0, sys_ni_syscall
+ /*
+ * Syscall number held in a7.
+ * If syscall number is above allowed value, redirect to ni_syscall.
+ */
+ bgeu a7, t0, 3f
+#ifdef CONFIG_COMPAT
+ REG_L s0, PT_STATUS(sp)
+ srli s0, s0, SR_UXL_SHIFT
+ andi s0, s0, (SR_UXL >> SR_UXL_SHIFT)
+ li t0, (SR_UXL_32 >> SR_UXL_SHIFT)
+ sub t0, s0, t0
+ bnez t0, 1f
+
+ /* Call compat_syscall */
+ la s0, compat_sys_call_table
+ j 2f
+1:
+#endif
+ /* Call syscall */
+ la s0, sys_call_table
+2:
+ slli t0, a7, RISCV_LGPTR
+ add s0, s0, t0
+ REG_L s0, 0(s0)
+3:
+ jalr s0
+
+ret_from_syscall:
+ /* Set user a0 to kernel a0 */
+ REG_S a0, PT_A0(sp)
+ /*
+ * We didn't execute the actual syscall.
+ * Seccomp already set return value for the current task pt_regs.
+ * (If it was configured with SECCOMP_RET_ERRNO/TRACE)
+ */
+ret_from_syscall_rejected:
+#ifdef CONFIG_DEBUG_RSEQ
+ move a0, sp
+ call rseq_syscall
+#endif
+ /* Trace syscalls, but only if requested by the user. */
+ REG_L t0, TASK_TI_FLAGS(tp)
+ andi t0, t0, _TIF_SYSCALL_WORK
+ bnez t0, handle_syscall_trace_exit
+
+ret_from_exception:
+ REG_L s0, PT_STATUS(sp)
+ csrc CSR_STATUS, SR_IE
+#ifdef CONFIG_TRACE_IRQFLAGS
+ call __trace_hardirqs_off
+#endif
+#ifdef CONFIG_RISCV_M_MODE
+ /* the MPP value is too large to be used as an immediate arg for addi */
+ li t0, SR_MPP
+ and s0, s0, t0
+#else
+ andi s0, s0, SR_SPP
+#endif
+ bnez s0, resume_kernel
+
+ /* Interrupts must be disabled here so flags are checked atomically */
+ REG_L s0, TASK_TI_FLAGS(tp) /* current_thread_info->flags */
+ andi s1, s0, _TIF_WORK_MASK
+ bnez s1, resume_userspace_slow
+resume_userspace:
+#ifdef CONFIG_CONTEXT_TRACKING_USER
+ call user_enter_callable
+#endif
+
+ /* Save unwound kernel stack pointer in thread_info */
+ addi s0, sp, PT_SIZE_ON_STACK
+ REG_S s0, TASK_TI_KERNEL_SP(tp)
+
+ /*
+ * Save TP into the scratch register , so we can find the kernel data
+ * structures again.
+ */
+ csrw CSR_SCRATCH, tp
+
+restore_all:
+#ifdef CONFIG_TRACE_IRQFLAGS
+ REG_L s1, PT_STATUS(sp)
+ andi t0, s1, SR_PIE
+ beqz t0, 1f
+ call __trace_hardirqs_on
+ j 2f
+1:
+ call __trace_hardirqs_off
+2:
+#endif
+ REG_L a0, PT_STATUS(sp)
+ /*
+ * The current load reservation is effectively part of the processor's
+ * state, in the sense that load reservations cannot be shared between
+ * different hart contexts. We can't actually save and restore a load
+ * reservation, so instead here we clear any existing reservation --
+ * it's always legal for implementations to clear load reservations at
+ * any point (as long as the forward progress guarantee is kept, but
+ * we'll ignore that here).
+ *
+ * Dangling load reservations can be the result of taking a trap in the
+ * middle of an LR/SC sequence, but can also be the result of a taken
+ * forward branch around an SC -- which is how we implement CAS. As a
+ * result we need to clear reservations between the last CAS and the
+ * jump back to the new context. While it is unlikely the store
+ * completes, implementations are allowed to expand reservations to be
+ * arbitrarily large.
+ */
+ REG_L a2, PT_EPC(sp)
+ REG_SC x0, a2, PT_EPC(sp)
+
+ csrw CSR_STATUS, a0
+ csrw CSR_EPC, a2
+
+ REG_L x1, PT_RA(sp)
+ REG_L x3, PT_GP(sp)
+ REG_L x4, PT_TP(sp)
+ REG_L x5, PT_T0(sp)
+ REG_L x6, PT_T1(sp)
+ REG_L x7, PT_T2(sp)
+ REG_L x8, PT_S0(sp)
+ REG_L x9, PT_S1(sp)
+ REG_L x10, PT_A0(sp)
+ REG_L x11, PT_A1(sp)
+ REG_L x12, PT_A2(sp)
+ REG_L x13, PT_A3(sp)
+ REG_L x14, PT_A4(sp)
+ REG_L x15, PT_A5(sp)
+ REG_L x16, PT_A6(sp)
+ REG_L x17, PT_A7(sp)
+ REG_L x18, PT_S2(sp)
+ REG_L x19, PT_S3(sp)
+ REG_L x20, PT_S4(sp)
+ REG_L x21, PT_S5(sp)
+ REG_L x22, PT_S6(sp)
+ REG_L x23, PT_S7(sp)
+ REG_L x24, PT_S8(sp)
+ REG_L x25, PT_S9(sp)
+ REG_L x26, PT_S10(sp)
+ REG_L x27, PT_S11(sp)
+ REG_L x28, PT_T3(sp)
+ REG_L x29, PT_T4(sp)
+ REG_L x30, PT_T5(sp)
+ REG_L x31, PT_T6(sp)
+
+ REG_L x2, PT_SP(sp)
+
+#ifdef CONFIG_RISCV_M_MODE
+ mret
+#else
+ sret
+#endif
+
+#if IS_ENABLED(CONFIG_PREEMPTION)
+resume_kernel:
+ REG_L s0, TASK_TI_PREEMPT_COUNT(tp)
+ bnez s0, restore_all
+ REG_L s0, TASK_TI_FLAGS(tp)
+ andi s0, s0, _TIF_NEED_RESCHED
+ beqz s0, restore_all
+ call preempt_schedule_irq
+ j restore_all
+#endif
+
+resume_userspace_slow:
+ /* Enter slow path for supplementary processing */
+ move a0, sp /* pt_regs */
+ move a1, s0 /* current_thread_info->flags */
+ call do_work_pending
+ j resume_userspace
+
+/* Slow paths for ptrace. */
+handle_syscall_trace_enter:
+ move a0, sp
+ call do_syscall_trace_enter
+ move t0, a0
+ REG_L a0, PT_A0(sp)
+ REG_L a1, PT_A1(sp)
+ REG_L a2, PT_A2(sp)
+ REG_L a3, PT_A3(sp)
+ REG_L a4, PT_A4(sp)
+ REG_L a5, PT_A5(sp)
+ REG_L a6, PT_A6(sp)
+ REG_L a7, PT_A7(sp)
+ bnez t0, ret_from_syscall_rejected
+ j check_syscall_nr
+handle_syscall_trace_exit:
+ move a0, sp
+ call do_syscall_trace_exit
+ j ret_from_exception
+
+#ifdef CONFIG_VMAP_STACK
+handle_kernel_stack_overflow:
+ /*
+ * Takes the psuedo-spinlock for the shadow stack, in case multiple
+ * harts are concurrently overflowing their kernel stacks. We could
+ * store any value here, but since we're overflowing the kernel stack
+ * already we only have SP to use as a scratch register. So we just
+ * swap in the address of the spinlock, as that's definately non-zero.
+ *
+ * Pairs with a store_release in handle_bad_stack().
+ */
+1: la sp, spin_shadow_stack
+ REG_AMOSWAP_AQ sp, sp, (sp)
+ bnez sp, 1b
+
+ la sp, shadow_stack
+ addi sp, sp, SHADOW_OVERFLOW_STACK_SIZE
+
+ //save caller register to shadow stack
+ addi sp, sp, -(PT_SIZE_ON_STACK)
+ REG_S x1, PT_RA(sp)
+ REG_S x5, PT_T0(sp)
+ REG_S x6, PT_T1(sp)
+ REG_S x7, PT_T2(sp)
+ REG_S x10, PT_A0(sp)
+ REG_S x11, PT_A1(sp)
+ REG_S x12, PT_A2(sp)
+ REG_S x13, PT_A3(sp)
+ REG_S x14, PT_A4(sp)
+ REG_S x15, PT_A5(sp)
+ REG_S x16, PT_A6(sp)
+ REG_S x17, PT_A7(sp)
+ REG_S x28, PT_T3(sp)
+ REG_S x29, PT_T4(sp)
+ REG_S x30, PT_T5(sp)
+ REG_S x31, PT_T6(sp)
+
+ la ra, restore_caller_reg
+ tail get_overflow_stack
+
+restore_caller_reg:
+ //save per-cpu overflow stack
+ REG_S a0, -8(sp)
+ //restore caller register from shadow_stack
+ REG_L x1, PT_RA(sp)
+ REG_L x5, PT_T0(sp)
+ REG_L x6, PT_T1(sp)
+ REG_L x7, PT_T2(sp)
+ REG_L x10, PT_A0(sp)
+ REG_L x11, PT_A1(sp)
+ REG_L x12, PT_A2(sp)
+ REG_L x13, PT_A3(sp)
+ REG_L x14, PT_A4(sp)
+ REG_L x15, PT_A5(sp)
+ REG_L x16, PT_A6(sp)
+ REG_L x17, PT_A7(sp)
+ REG_L x28, PT_T3(sp)
+ REG_L x29, PT_T4(sp)
+ REG_L x30, PT_T5(sp)
+ REG_L x31, PT_T6(sp)
+
+ //load per-cpu overflow stack
+ REG_L sp, -8(sp)
+ addi sp, sp, -(PT_SIZE_ON_STACK)
+
+ //save context to overflow stack
+ REG_S x1, PT_RA(sp)
+ REG_S x3, PT_GP(sp)
+ REG_S x5, PT_T0(sp)
+ REG_S x6, PT_T1(sp)
+ REG_S x7, PT_T2(sp)
+ REG_S x8, PT_S0(sp)
+ REG_S x9, PT_S1(sp)
+ REG_S x10, PT_A0(sp)
+ REG_S x11, PT_A1(sp)
+ REG_S x12, PT_A2(sp)
+ REG_S x13, PT_A3(sp)
+ REG_S x14, PT_A4(sp)
+ REG_S x15, PT_A5(sp)
+ REG_S x16, PT_A6(sp)
+ REG_S x17, PT_A7(sp)
+ REG_S x18, PT_S2(sp)
+ REG_S x19, PT_S3(sp)
+ REG_S x20, PT_S4(sp)
+ REG_S x21, PT_S5(sp)
+ REG_S x22, PT_S6(sp)
+ REG_S x23, PT_S7(sp)
+ REG_S x24, PT_S8(sp)
+ REG_S x25, PT_S9(sp)
+ REG_S x26, PT_S10(sp)
+ REG_S x27, PT_S11(sp)
+ REG_S x28, PT_T3(sp)
+ REG_S x29, PT_T4(sp)
+ REG_S x30, PT_T5(sp)
+ REG_S x31, PT_T6(sp)
+
+ REG_L s0, TASK_TI_KERNEL_SP(tp)
+ csrr s1, CSR_STATUS
+ csrr s2, CSR_EPC
+ csrr s3, CSR_TVAL
+ csrr s4, CSR_CAUSE
+ csrr s5, CSR_SCRATCH
+ REG_S s0, PT_SP(sp)
+ REG_S s1, PT_STATUS(sp)
+ REG_S s2, PT_EPC(sp)
+ REG_S s3, PT_BADADDR(sp)
+ REG_S s4, PT_CAUSE(sp)
+ REG_S s5, PT_TP(sp)
+ move a0, sp
+ tail handle_bad_stack
+#endif
+
+END(handle_exception)
+
+ENTRY(ret_from_fork)
+ la ra, ret_from_exception
+ tail schedule_tail
+ENDPROC(ret_from_fork)
+
+ENTRY(ret_from_kernel_thread)
+ call schedule_tail
+ /* Call fn(arg) */
+ la ra, ret_from_exception
+ move a0, s1
+ jr s0
+ENDPROC(ret_from_kernel_thread)
+
+
+/*
+ * Integer register context switch
+ * The callee-saved registers must be saved and restored.
+ *
+ * a0: previous task_struct (must be preserved across the switch)
+ * a1: next task_struct
+ *
+ * The value of a0 and a1 must be preserved by this function, as that's how
+ * arguments are passed to schedule_tail.
+ */
+ENTRY(__switch_to)
+ /* Save context into prev->thread */
+ li a4, TASK_THREAD_RA
+ add a3, a0, a4
+ add a4, a1, a4
+ REG_S ra, TASK_THREAD_RA_RA(a3)
+ REG_S sp, TASK_THREAD_SP_RA(a3)
+ REG_S s0, TASK_THREAD_S0_RA(a3)
+ REG_S s1, TASK_THREAD_S1_RA(a3)
+ REG_S s2, TASK_THREAD_S2_RA(a3)
+ REG_S s3, TASK_THREAD_S3_RA(a3)
+ REG_S s4, TASK_THREAD_S4_RA(a3)
+ REG_S s5, TASK_THREAD_S5_RA(a3)
+ REG_S s6, TASK_THREAD_S6_RA(a3)
+ REG_S s7, TASK_THREAD_S7_RA(a3)
+ REG_S s8, TASK_THREAD_S8_RA(a3)
+ REG_S s9, TASK_THREAD_S9_RA(a3)
+ REG_S s10, TASK_THREAD_S10_RA(a3)
+ REG_S s11, TASK_THREAD_S11_RA(a3)
+ /* Restore context from next->thread */
+ REG_L ra, TASK_THREAD_RA_RA(a4)
+ REG_L sp, TASK_THREAD_SP_RA(a4)
+ REG_L s0, TASK_THREAD_S0_RA(a4)
+ REG_L s1, TASK_THREAD_S1_RA(a4)
+ REG_L s2, TASK_THREAD_S2_RA(a4)
+ REG_L s3, TASK_THREAD_S3_RA(a4)
+ REG_L s4, TASK_THREAD_S4_RA(a4)
+ REG_L s5, TASK_THREAD_S5_RA(a4)
+ REG_L s6, TASK_THREAD_S6_RA(a4)
+ REG_L s7, TASK_THREAD_S7_RA(a4)
+ REG_L s8, TASK_THREAD_S8_RA(a4)
+ REG_L s9, TASK_THREAD_S9_RA(a4)
+ REG_L s10, TASK_THREAD_S10_RA(a4)
+ REG_L s11, TASK_THREAD_S11_RA(a4)
+ /* The offset of thread_info in task_struct is zero. */
+ move tp, a1
+ ret
+ENDPROC(__switch_to)
+
+#ifndef CONFIG_MMU
+#define do_page_fault do_trap_unknown
+#endif
+
+ .section ".rodata"
+ .align LGREG
+ /* Exception vector table */
+ENTRY(excp_vect_table)
+ RISCV_PTR do_trap_insn_misaligned
+ ALT_INSN_FAULT(RISCV_PTR do_trap_insn_fault)
+ RISCV_PTR do_trap_insn_illegal
+ RISCV_PTR do_trap_break
+ RISCV_PTR do_trap_load_misaligned
+ RISCV_PTR do_trap_load_fault
+ RISCV_PTR do_trap_store_misaligned
+ RISCV_PTR do_trap_store_fault
+ RISCV_PTR do_trap_ecall_u /* system call, gets intercepted */
+ RISCV_PTR do_trap_ecall_s
+ RISCV_PTR do_trap_unknown
+ RISCV_PTR do_trap_ecall_m
+ /* instruciton page fault */
+ ALT_PAGE_FAULT(RISCV_PTR do_page_fault)
+ RISCV_PTR do_page_fault /* load page fault */
+ RISCV_PTR do_trap_unknown
+ RISCV_PTR do_page_fault /* store page fault */
+excp_vect_table_end:
+END(excp_vect_table)
+
+#ifndef CONFIG_MMU
+ENTRY(__user_rt_sigreturn)
+ li a7, __NR_rt_sigreturn
+ scall
+END(__user_rt_sigreturn)
+#endif
diff --git a/arch/riscv/kernel/fpu.S b/arch/riscv/kernel/fpu.S
new file mode 100644
index 000000000..dd2205473
--- /dev/null
+++ b/arch/riscv/kernel/fpu.S
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/asm-offsets.h>
+
+ENTRY(__fstate_save)
+ li a2, TASK_THREAD_F0
+ add a0, a0, a2
+ li t1, SR_FS
+ csrs CSR_STATUS, t1
+ frcsr t0
+ fsd f0, TASK_THREAD_F0_F0(a0)
+ fsd f1, TASK_THREAD_F1_F0(a0)
+ fsd f2, TASK_THREAD_F2_F0(a0)
+ fsd f3, TASK_THREAD_F3_F0(a0)
+ fsd f4, TASK_THREAD_F4_F0(a0)
+ fsd f5, TASK_THREAD_F5_F0(a0)
+ fsd f6, TASK_THREAD_F6_F0(a0)
+ fsd f7, TASK_THREAD_F7_F0(a0)
+ fsd f8, TASK_THREAD_F8_F0(a0)
+ fsd f9, TASK_THREAD_F9_F0(a0)
+ fsd f10, TASK_THREAD_F10_F0(a0)
+ fsd f11, TASK_THREAD_F11_F0(a0)
+ fsd f12, TASK_THREAD_F12_F0(a0)
+ fsd f13, TASK_THREAD_F13_F0(a0)
+ fsd f14, TASK_THREAD_F14_F0(a0)
+ fsd f15, TASK_THREAD_F15_F0(a0)
+ fsd f16, TASK_THREAD_F16_F0(a0)
+ fsd f17, TASK_THREAD_F17_F0(a0)
+ fsd f18, TASK_THREAD_F18_F0(a0)
+ fsd f19, TASK_THREAD_F19_F0(a0)
+ fsd f20, TASK_THREAD_F20_F0(a0)
+ fsd f21, TASK_THREAD_F21_F0(a0)
+ fsd f22, TASK_THREAD_F22_F0(a0)
+ fsd f23, TASK_THREAD_F23_F0(a0)
+ fsd f24, TASK_THREAD_F24_F0(a0)
+ fsd f25, TASK_THREAD_F25_F0(a0)
+ fsd f26, TASK_THREAD_F26_F0(a0)
+ fsd f27, TASK_THREAD_F27_F0(a0)
+ fsd f28, TASK_THREAD_F28_F0(a0)
+ fsd f29, TASK_THREAD_F29_F0(a0)
+ fsd f30, TASK_THREAD_F30_F0(a0)
+ fsd f31, TASK_THREAD_F31_F0(a0)
+ sw t0, TASK_THREAD_FCSR_F0(a0)
+ csrc CSR_STATUS, t1
+ ret
+ENDPROC(__fstate_save)
+
+ENTRY(__fstate_restore)
+ li a2, TASK_THREAD_F0
+ add a0, a0, a2
+ li t1, SR_FS
+ lw t0, TASK_THREAD_FCSR_F0(a0)
+ csrs CSR_STATUS, t1
+ fld f0, TASK_THREAD_F0_F0(a0)
+ fld f1, TASK_THREAD_F1_F0(a0)
+ fld f2, TASK_THREAD_F2_F0(a0)
+ fld f3, TASK_THREAD_F3_F0(a0)
+ fld f4, TASK_THREAD_F4_F0(a0)
+ fld f5, TASK_THREAD_F5_F0(a0)
+ fld f6, TASK_THREAD_F6_F0(a0)
+ fld f7, TASK_THREAD_F7_F0(a0)
+ fld f8, TASK_THREAD_F8_F0(a0)
+ fld f9, TASK_THREAD_F9_F0(a0)
+ fld f10, TASK_THREAD_F10_F0(a0)
+ fld f11, TASK_THREAD_F11_F0(a0)
+ fld f12, TASK_THREAD_F12_F0(a0)
+ fld f13, TASK_THREAD_F13_F0(a0)
+ fld f14, TASK_THREAD_F14_F0(a0)
+ fld f15, TASK_THREAD_F15_F0(a0)
+ fld f16, TASK_THREAD_F16_F0(a0)
+ fld f17, TASK_THREAD_F17_F0(a0)
+ fld f18, TASK_THREAD_F18_F0(a0)
+ fld f19, TASK_THREAD_F19_F0(a0)
+ fld f20, TASK_THREAD_F20_F0(a0)
+ fld f21, TASK_THREAD_F21_F0(a0)
+ fld f22, TASK_THREAD_F22_F0(a0)
+ fld f23, TASK_THREAD_F23_F0(a0)
+ fld f24, TASK_THREAD_F24_F0(a0)
+ fld f25, TASK_THREAD_F25_F0(a0)
+ fld f26, TASK_THREAD_F26_F0(a0)
+ fld f27, TASK_THREAD_F27_F0(a0)
+ fld f28, TASK_THREAD_F28_F0(a0)
+ fld f29, TASK_THREAD_F29_F0(a0)
+ fld f30, TASK_THREAD_F30_F0(a0)
+ fld f31, TASK_THREAD_F31_F0(a0)
+ fscsr t0
+ csrc CSR_STATUS, t1
+ ret
+ENDPROC(__fstate_restore)
diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
new file mode 100644
index 000000000..03a6434a8
--- /dev/null
+++ b/arch/riscv/kernel/ftrace.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013 Linaro Limited
+ * Author: AKASHI Takahiro <takahiro.akashi@linaro.org>
+ * Copyright (C) 2017 Andes Technology Corporation
+ */
+
+#include <linux/ftrace.h>
+#include <linux/uaccess.h>
+#include <linux/memory.h>
+#include <asm/cacheflush.h>
+#include <asm/patch.h>
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+void ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex)
+{
+ mutex_lock(&text_mutex);
+
+ /*
+ * The code sequences we use for ftrace can't be patched while the
+ * kernel is running, so we need to use stop_machine() to modify them
+ * for now. This doesn't play nice with text_mutex, we use this flag
+ * to elide the check.
+ */
+ riscv_patch_in_stop_machine = true;
+}
+
+void ftrace_arch_code_modify_post_process(void) __releases(&text_mutex)
+{
+ riscv_patch_in_stop_machine = false;
+ mutex_unlock(&text_mutex);
+}
+
+static int ftrace_check_current_call(unsigned long hook_pos,
+ unsigned int *expected)
+{
+ unsigned int replaced[2];
+ unsigned int nops[2] = {NOP4, NOP4};
+
+ /* we expect nops at the hook position */
+ if (!expected)
+ expected = nops;
+
+ /*
+ * Read the text we want to modify;
+ * return must be -EFAULT on read error
+ */
+ if (copy_from_kernel_nofault(replaced, (void *)hook_pos,
+ MCOUNT_INSN_SIZE))
+ return -EFAULT;
+
+ /*
+ * Make sure it is what we expect it to be;
+ * return must be -EINVAL on failed comparison
+ */
+ if (memcmp(expected, replaced, sizeof(replaced))) {
+ pr_err("%p: expected (%08x %08x) but got (%08x %08x)\n",
+ (void *)hook_pos, expected[0], expected[1], replaced[0],
+ replaced[1]);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int __ftrace_modify_call(unsigned long hook_pos, unsigned long target,
+ bool enable, bool ra)
+{
+ unsigned int call[2];
+ unsigned int nops[2] = {NOP4, NOP4};
+
+ if (ra)
+ make_call_ra(hook_pos, target, call);
+ else
+ make_call_t0(hook_pos, target, call);
+
+ /* Replace the auipc-jalr pair at once. Return -EPERM on write error. */
+ if (patch_text_nosync
+ ((void *)hook_pos, enable ? call : nops, MCOUNT_INSN_SIZE))
+ return -EPERM;
+
+ return 0;
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+ unsigned int call[2];
+
+ make_call_t0(rec->ip, addr, call);
+
+ if (patch_text_nosync((void *)rec->ip, call, MCOUNT_INSN_SIZE))
+ return -EPERM;
+
+ return 0;
+}
+
+int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
+{
+ unsigned int nops[2] = {NOP4, NOP4};
+
+ if (patch_text_nosync((void *)rec->ip, nops, MCOUNT_INSN_SIZE))
+ return -EPERM;
+
+ return 0;
+}
+
+/*
+ * This is called early on, and isn't wrapped by
+ * ftrace_arch_code_modify_{prepare,post_process}() and therefor doesn't hold
+ * text_mutex, which triggers a lockdep failure. SMP isn't running so we could
+ * just directly poke the text, but it's simpler to just take the lock
+ * ourselves.
+ */
+int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec)
+{
+ int out;
+
+ mutex_lock(&text_mutex);
+ out = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
+ mutex_unlock(&text_mutex);
+
+ return out;
+}
+
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ int ret = __ftrace_modify_call((unsigned long)&ftrace_call,
+ (unsigned long)func, true, true);
+ if (!ret) {
+ ret = __ftrace_modify_call((unsigned long)&ftrace_regs_call,
+ (unsigned long)func, true, true);
+ }
+
+ return ret;
+}
+#endif
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
+ unsigned long addr)
+{
+ unsigned int call[2];
+ unsigned long caller = rec->ip;
+ int ret;
+
+ make_call_t0(caller, old_addr, call);
+ ret = ftrace_check_current_call(caller, call);
+
+ if (ret)
+ return ret;
+
+ return __ftrace_modify_call(caller, addr, true, false);
+}
+#endif
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/*
+ * Most of this function is copied from arm64.
+ */
+void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
+ unsigned long frame_pointer)
+{
+ unsigned long return_hooker = (unsigned long)&return_to_handler;
+ unsigned long old;
+
+ if (unlikely(atomic_read(&current->tracing_graph_pause)))
+ return;
+
+ /*
+ * We don't suffer access faults, so no extra fault-recovery assembly
+ * is needed here.
+ */
+ old = *parent;
+
+ if (!function_graph_enter(old, self_addr, frame_pointer, parent))
+ *parent = return_hooker;
+}
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+extern void ftrace_graph_call(void);
+extern void ftrace_graph_regs_call(void);
+int ftrace_enable_ftrace_graph_caller(void)
+{
+ int ret;
+
+ ret = __ftrace_modify_call((unsigned long)&ftrace_graph_call,
+ (unsigned long)&prepare_ftrace_return, true, true);
+ if (ret)
+ return ret;
+
+ return __ftrace_modify_call((unsigned long)&ftrace_graph_regs_call,
+ (unsigned long)&prepare_ftrace_return, true, true);
+}
+
+int ftrace_disable_ftrace_graph_caller(void)
+{
+ int ret;
+
+ ret = __ftrace_modify_call((unsigned long)&ftrace_graph_call,
+ (unsigned long)&prepare_ftrace_return, false, true);
+ if (ret)
+ return ret;
+
+ return __ftrace_modify_call((unsigned long)&ftrace_graph_regs_call,
+ (unsigned long)&prepare_ftrace_return, false, true);
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
new file mode 100644
index 000000000..4bf6c449d
--- /dev/null
+++ b/arch/riscv/kernel/head.S
@@ -0,0 +1,437 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/asm.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/thread_info.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/csr.h>
+#include <asm/cpu_ops_sbi.h>
+#include <asm/hwcap.h>
+#include <asm/image.h>
+#include <asm/xip_fixup.h>
+#include "efi-header.S"
+
+__HEAD
+ENTRY(_start)
+ /*
+ * Image header expected by Linux boot-loaders. The image header data
+ * structure is described in asm/image.h.
+ * Do not modify it without modifying the structure and all bootloaders
+ * that expects this header format!!
+ */
+#ifdef CONFIG_EFI
+ /*
+ * This instruction decodes to "MZ" ASCII required by UEFI.
+ */
+ c.li s4,-13
+ j _start_kernel
+#else
+ /* jump to start kernel */
+ j _start_kernel
+ /* reserved */
+ .word 0
+#endif
+ .balign 8
+#ifdef CONFIG_RISCV_M_MODE
+ /* Image load offset (0MB) from start of RAM for M-mode */
+ .dword 0
+#else
+#if __riscv_xlen == 64
+ /* Image load offset(2MB) from start of RAM */
+ .dword 0x200000
+#else
+ /* Image load offset(4MB) from start of RAM */
+ .dword 0x400000
+#endif
+#endif
+ /* Effective size of kernel image */
+ .dword _end - _start
+ .dword __HEAD_FLAGS
+ .word RISCV_HEADER_VERSION
+ .word 0
+ .dword 0
+ .ascii RISCV_IMAGE_MAGIC
+ .balign 4
+ .ascii RISCV_IMAGE_MAGIC2
+#ifdef CONFIG_EFI
+ .word pe_head_start - _start
+pe_head_start:
+
+ __EFI_PE_HEADER
+#else
+ .word 0
+#endif
+
+.align 2
+#ifdef CONFIG_MMU
+ .global relocate_enable_mmu
+relocate_enable_mmu:
+ /* Relocate return address */
+ la a1, kernel_map
+ XIP_FIXUP_OFFSET a1
+ REG_L a1, KERNEL_MAP_VIRT_ADDR(a1)
+ la a2, _start
+ sub a1, a1, a2
+ add ra, ra, a1
+
+ /* Point stvec to virtual address of intruction after satp write */
+ la a2, 1f
+ add a2, a2, a1
+ csrw CSR_TVEC, a2
+
+ /* Compute satp for kernel page tables, but don't load it yet */
+ srl a2, a0, PAGE_SHIFT
+ la a1, satp_mode
+ REG_L a1, 0(a1)
+ or a2, a2, a1
+
+ /*
+ * Load trampoline page directory, which will cause us to trap to
+ * stvec if VA != PA, or simply fall through if VA == PA. We need a
+ * full fence here because setup_vm() just wrote these PTEs and we need
+ * to ensure the new translations are in use.
+ */
+ la a0, trampoline_pg_dir
+ XIP_FIXUP_OFFSET a0
+ srl a0, a0, PAGE_SHIFT
+ or a0, a0, a1
+ sfence.vma
+ csrw CSR_SATP, a0
+.align 2
+1:
+ /* Set trap vector to spin forever to help debug */
+ la a0, .Lsecondary_park
+ csrw CSR_TVEC, a0
+
+ /* Reload the global pointer */
+.option push
+.option norelax
+ la gp, __global_pointer$
+.option pop
+
+ /*
+ * Switch to kernel page tables. A full fence is necessary in order to
+ * avoid using the trampoline translations, which are only correct for
+ * the first superpage. Fetching the fence is guaranteed to work
+ * because that first superpage is translated the same way.
+ */
+ csrw CSR_SATP, a2
+ sfence.vma
+
+ ret
+#endif /* CONFIG_MMU */
+#ifdef CONFIG_SMP
+ .global secondary_start_sbi
+secondary_start_sbi:
+ /* Mask all interrupts */
+ csrw CSR_IE, zero
+ csrw CSR_IP, zero
+
+ /* Load the global pointer */
+ .option push
+ .option norelax
+ la gp, __global_pointer$
+ .option pop
+
+ /*
+ * Disable FPU to detect illegal usage of
+ * floating point in kernel space
+ */
+ li t0, SR_FS
+ csrc CSR_STATUS, t0
+
+ /* Set trap vector to spin forever to help debug */
+ la a3, .Lsecondary_park
+ csrw CSR_TVEC, a3
+
+ /* a0 contains the hartid & a1 contains boot data */
+ li a2, SBI_HART_BOOT_TASK_PTR_OFFSET
+ XIP_FIXUP_OFFSET a2
+ add a2, a2, a1
+ REG_L tp, (a2)
+ li a3, SBI_HART_BOOT_STACK_PTR_OFFSET
+ XIP_FIXUP_OFFSET a3
+ add a3, a3, a1
+ REG_L sp, (a3)
+
+.Lsecondary_start_common:
+
+#ifdef CONFIG_MMU
+ /* Enable virtual memory and relocate to virtual address */
+ la a0, swapper_pg_dir
+ XIP_FIXUP_OFFSET a0
+ call relocate_enable_mmu
+#endif
+ call setup_trap_vector
+ tail smp_callin
+#endif /* CONFIG_SMP */
+
+.align 2
+setup_trap_vector:
+ /* Set trap vector to exception handler */
+ la a0, handle_exception
+ csrw CSR_TVEC, a0
+
+ /*
+ * Set sup0 scratch register to 0, indicating to exception vector that
+ * we are presently executing in kernel.
+ */
+ csrw CSR_SCRATCH, zero
+ ret
+
+.align 2
+.Lsecondary_park:
+ /* We lack SMP support or have too many harts, so park this hart */
+ wfi
+ j .Lsecondary_park
+
+END(_start)
+
+ENTRY(_start_kernel)
+ /* Mask all interrupts */
+ csrw CSR_IE, zero
+ csrw CSR_IP, zero
+
+#ifdef CONFIG_RISCV_M_MODE
+ /* flush the instruction cache */
+ fence.i
+
+ /* Reset all registers except ra, a0, a1 */
+ call reset_regs
+
+ /*
+ * Setup a PMP to permit access to all of memory. Some machines may
+ * not implement PMPs, so we set up a quick trap handler to just skip
+ * touching the PMPs on any trap.
+ */
+ la a0, pmp_done
+ csrw CSR_TVEC, a0
+
+ li a0, -1
+ csrw CSR_PMPADDR0, a0
+ li a0, (PMP_A_NAPOT | PMP_R | PMP_W | PMP_X)
+ csrw CSR_PMPCFG0, a0
+.align 2
+pmp_done:
+
+ /*
+ * The hartid in a0 is expected later on, and we have no firmware
+ * to hand it to us.
+ */
+ csrr a0, CSR_MHARTID
+#endif /* CONFIG_RISCV_M_MODE */
+
+ /* Load the global pointer */
+.option push
+.option norelax
+ la gp, __global_pointer$
+.option pop
+
+ /*
+ * Disable FPU to detect illegal usage of
+ * floating point in kernel space
+ */
+ li t0, SR_FS
+ csrc CSR_STATUS, t0
+
+#ifdef CONFIG_RISCV_BOOT_SPINWAIT
+ li t0, CONFIG_NR_CPUS
+ blt a0, t0, .Lgood_cores
+ tail .Lsecondary_park
+.Lgood_cores:
+
+ /* The lottery system is only required for spinwait booting method */
+#ifndef CONFIG_XIP_KERNEL
+ /* Pick one hart to run the main boot sequence */
+ la a3, hart_lottery
+ li a2, 1
+ amoadd.w a3, a2, (a3)
+ bnez a3, .Lsecondary_start
+
+#else
+ /* hart_lottery in flash contains a magic number */
+ la a3, hart_lottery
+ mv a2, a3
+ XIP_FIXUP_OFFSET a2
+ XIP_FIXUP_FLASH_OFFSET a3
+ lw t1, (a3)
+ amoswap.w t0, t1, (a2)
+ /* first time here if hart_lottery in RAM is not set */
+ beq t0, t1, .Lsecondary_start
+
+#endif /* CONFIG_XIP */
+#endif /* CONFIG_RISCV_BOOT_SPINWAIT */
+
+#ifdef CONFIG_XIP_KERNEL
+ la sp, _end + THREAD_SIZE
+ XIP_FIXUP_OFFSET sp
+ mv s0, a0
+ call __copy_data
+
+ /* Restore a0 copy */
+ mv a0, s0
+#endif
+
+#ifndef CONFIG_XIP_KERNEL
+ /* Clear BSS for flat non-ELF images */
+ la a3, __bss_start
+ la a4, __bss_stop
+ ble a4, a3, clear_bss_done
+clear_bss:
+ REG_S zero, (a3)
+ add a3, a3, RISCV_SZPTR
+ blt a3, a4, clear_bss
+clear_bss_done:
+#endif
+ /* Save hart ID and DTB physical address */
+ mv s0, a0
+ mv s1, a1
+
+ la a2, boot_cpu_hartid
+ XIP_FIXUP_OFFSET a2
+ REG_S a0, (a2)
+
+ /* Initialize page tables and relocate to virtual addresses */
+ la tp, init_task
+ la sp, init_thread_union + THREAD_SIZE
+ XIP_FIXUP_OFFSET sp
+#ifdef CONFIG_BUILTIN_DTB
+ la a0, __dtb_start
+ XIP_FIXUP_OFFSET a0
+#else
+ mv a0, s1
+#endif /* CONFIG_BUILTIN_DTB */
+ call setup_vm
+#ifdef CONFIG_MMU
+ la a0, early_pg_dir
+ XIP_FIXUP_OFFSET a0
+ call relocate_enable_mmu
+#endif /* CONFIG_MMU */
+
+ call setup_trap_vector
+ /* Restore C environment */
+ la tp, init_task
+ la sp, init_thread_union + THREAD_SIZE
+
+#ifdef CONFIG_KASAN
+ call kasan_early_init
+#endif
+ /* Start the kernel */
+ call soc_early_init
+ tail start_kernel
+
+#ifdef CONFIG_RISCV_BOOT_SPINWAIT
+.Lsecondary_start:
+ /* Set trap vector to spin forever to help debug */
+ la a3, .Lsecondary_park
+ csrw CSR_TVEC, a3
+
+ slli a3, a0, LGREG
+ la a1, __cpu_spinwait_stack_pointer
+ XIP_FIXUP_OFFSET a1
+ la a2, __cpu_spinwait_task_pointer
+ XIP_FIXUP_OFFSET a2
+ add a1, a3, a1
+ add a2, a3, a2
+
+ /*
+ * This hart didn't win the lottery, so we wait for the winning hart to
+ * get far enough along the boot process that it should continue.
+ */
+.Lwait_for_cpu_up:
+ /* FIXME: We should WFI to save some energy here. */
+ REG_L sp, (a1)
+ REG_L tp, (a2)
+ beqz sp, .Lwait_for_cpu_up
+ beqz tp, .Lwait_for_cpu_up
+ fence
+
+ tail .Lsecondary_start_common
+#endif /* CONFIG_RISCV_BOOT_SPINWAIT */
+
+END(_start_kernel)
+
+#ifdef CONFIG_RISCV_M_MODE
+ENTRY(reset_regs)
+ li sp, 0
+ li gp, 0
+ li tp, 0
+ li t0, 0
+ li t1, 0
+ li t2, 0
+ li s0, 0
+ li s1, 0
+ li a2, 0
+ li a3, 0
+ li a4, 0
+ li a5, 0
+ li a6, 0
+ li a7, 0
+ li s2, 0
+ li s3, 0
+ li s4, 0
+ li s5, 0
+ li s6, 0
+ li s7, 0
+ li s8, 0
+ li s9, 0
+ li s10, 0
+ li s11, 0
+ li t3, 0
+ li t4, 0
+ li t5, 0
+ li t6, 0
+ csrw CSR_SCRATCH, 0
+
+#ifdef CONFIG_FPU
+ csrr t0, CSR_MISA
+ andi t0, t0, (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D)
+ beqz t0, .Lreset_regs_done
+
+ li t1, SR_FS
+ csrs CSR_STATUS, t1
+ fmv.s.x f0, zero
+ fmv.s.x f1, zero
+ fmv.s.x f2, zero
+ fmv.s.x f3, zero
+ fmv.s.x f4, zero
+ fmv.s.x f5, zero
+ fmv.s.x f6, zero
+ fmv.s.x f7, zero
+ fmv.s.x f8, zero
+ fmv.s.x f9, zero
+ fmv.s.x f10, zero
+ fmv.s.x f11, zero
+ fmv.s.x f12, zero
+ fmv.s.x f13, zero
+ fmv.s.x f14, zero
+ fmv.s.x f15, zero
+ fmv.s.x f16, zero
+ fmv.s.x f17, zero
+ fmv.s.x f18, zero
+ fmv.s.x f19, zero
+ fmv.s.x f20, zero
+ fmv.s.x f21, zero
+ fmv.s.x f22, zero
+ fmv.s.x f23, zero
+ fmv.s.x f24, zero
+ fmv.s.x f25, zero
+ fmv.s.x f26, zero
+ fmv.s.x f27, zero
+ fmv.s.x f28, zero
+ fmv.s.x f29, zero
+ fmv.s.x f30, zero
+ fmv.s.x f31, zero
+ csrw fcsr, 0
+ /* note that the caller must clear SR_FS */
+#endif /* CONFIG_FPU */
+.Lreset_regs_done:
+ ret
+END(reset_regs)
+#endif /* CONFIG_RISCV_M_MODE */
diff --git a/arch/riscv/kernel/head.h b/arch/riscv/kernel/head.h
new file mode 100644
index 000000000..726731ada
--- /dev/null
+++ b/arch/riscv/kernel/head.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 SiFive, Inc.
+ */
+#ifndef __ASM_HEAD_H
+#define __ASM_HEAD_H
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+extern atomic_t hart_lottery;
+
+asmlinkage void do_page_fault(struct pt_regs *regs);
+asmlinkage void __init setup_vm(uintptr_t dtb_pa);
+#ifdef CONFIG_XIP_KERNEL
+asmlinkage void __init __copy_data(void);
+#endif
+
+#ifdef CONFIG_RISCV_BOOT_SPINWAIT
+extern void *__cpu_spinwait_stack_pointer[];
+extern void *__cpu_spinwait_task_pointer[];
+#endif
+
+#endif /* __ASM_HEAD_H */
diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h
new file mode 100644
index 000000000..d6e5f7399
--- /dev/null
+++ b/arch/riscv/kernel/image-vars.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ * Linker script variables to be set after section resolution, as
+ * ld.lld does not like variables assigned before SECTIONS is processed.
+ * Based on arch/arm64/kernel/image-vars.h
+ */
+#ifndef __RISCV_KERNEL_IMAGE_VARS_H
+#define __RISCV_KERNEL_IMAGE_VARS_H
+
+#ifndef LINKER_SCRIPT
+#error This file should only be included in vmlinux.lds.S
+#endif
+
+#ifdef CONFIG_EFI
+
+/*
+ * The EFI stub has its own symbol namespace prefixed by __efistub_, to
+ * isolate it from the kernel proper. The following symbols are legally
+ * accessed by the stub, so provide some aliases to make them accessible.
+ * Only include data symbols here, or text symbols of functions that are
+ * guaranteed to be safe when executed at another offset than they were
+ * linked at. The routines below are all implemented in assembler in a
+ * position independent manner
+ */
+__efistub_memcmp = memcmp;
+__efistub_memchr = memchr;
+__efistub_strlen = strlen;
+__efistub_strnlen = strnlen;
+__efistub_strcmp = strcmp;
+__efistub_strncmp = strncmp;
+__efistub_strrchr = strrchr;
+
+__efistub__start = _start;
+__efistub__start_kernel = _start_kernel;
+__efistub__end = _end;
+__efistub__edata = _edata;
+__efistub_screen_info = screen_info;
+
+#endif
+
+#endif /* __RISCV_KERNEL_IMAGE_VARS_H */
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
new file mode 100644
index 000000000..7207fa08d
--- /dev/null
+++ b/arch/riscv/kernel/irq.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ * Copyright (C) 2018 Christoph Hellwig
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
+#include <linux/seq_file.h>
+#include <asm/smp.h>
+
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+ show_ipi_stats(p, prec);
+ return 0;
+}
+
+void __init init_IRQ(void)
+{
+ irqchip_init();
+ if (!handle_arch_irq)
+ panic("No interrupt controller found.");
+}
diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c
new file mode 100644
index 000000000..e6694759d
--- /dev/null
+++ b/arch/riscv/kernel/jump_label.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Emil Renner Berthing
+ *
+ * Based on arch/arm64/kernel/jump_label.c
+ */
+#include <linux/jump_label.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
+#include <linux/mutex.h>
+#include <asm/bug.h>
+#include <asm/patch.h>
+
+#define RISCV_INSN_NOP 0x00000013U
+#define RISCV_INSN_JAL 0x0000006fU
+
+void arch_jump_label_transform(struct jump_entry *entry,
+ enum jump_label_type type)
+{
+ void *addr = (void *)jump_entry_code(entry);
+ u32 insn;
+
+ if (type == JUMP_LABEL_JMP) {
+ long offset = jump_entry_target(entry) - jump_entry_code(entry);
+
+ if (WARN_ON(offset & 1 || offset < -524288 || offset >= 524288))
+ return;
+
+ insn = RISCV_INSN_JAL |
+ (((u32)offset & GENMASK(19, 12)) << (12 - 12)) |
+ (((u32)offset & GENMASK(11, 11)) << (20 - 11)) |
+ (((u32)offset & GENMASK(10, 1)) << (21 - 1)) |
+ (((u32)offset & GENMASK(20, 20)) << (31 - 20));
+ } else {
+ insn = RISCV_INSN_NOP;
+ }
+
+ mutex_lock(&text_mutex);
+ patch_text_nosync(addr, &insn, sizeof(insn));
+ mutex_unlock(&text_mutex);
+}
diff --git a/arch/riscv/kernel/kexec_relocate.S b/arch/riscv/kernel/kexec_relocate.S
new file mode 100644
index 000000000..059c5e216
--- /dev/null
+++ b/arch/riscv/kernel/kexec_relocate.S
@@ -0,0 +1,221 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 FORTH-ICS/CARV
+ * Nick Kossifidis <mick@ics.forth.gr>
+ */
+
+#include <asm/asm.h> /* For RISCV_* and REG_* macros */
+#include <asm/csr.h> /* For CSR_* macros */
+#include <asm/page.h> /* For PAGE_SIZE */
+#include <linux/linkage.h> /* For SYM_* macros */
+
+.section ".rodata"
+SYM_CODE_START(riscv_kexec_relocate)
+
+ /*
+ * s0: Pointer to the current entry
+ * s1: (const) Phys address to jump to after relocation
+ * s2: (const) Phys address of the FDT image
+ * s3: (const) The hartid of the current hart
+ * s4: Pointer to the destination address for the relocation
+ * s5: (const) Number of words per page
+ * s6: (const) 1, used for subtraction
+ * s7: (const) kernel_map.va_pa_offset, used when switching MMU off
+ * s8: (const) Physical address of the main loop
+ * s9: (debug) indirection page counter
+ * s10: (debug) entry counter
+ * s11: (debug) copied words counter
+ */
+ mv s0, a0
+ mv s1, a1
+ mv s2, a2
+ mv s3, a3
+ mv s4, zero
+ li s5, (PAGE_SIZE / RISCV_SZPTR)
+ li s6, 1
+ mv s7, a4
+ mv s8, zero
+ mv s9, zero
+ mv s10, zero
+ mv s11, zero
+
+ /* Disable / cleanup interrupts */
+ csrw CSR_SIE, zero
+ csrw CSR_SIP, zero
+
+ /*
+ * When we switch SATP.MODE to "Bare" we'll only
+ * play with physical addresses. However the first time
+ * we try to jump somewhere, the offset on the jump
+ * will be relative to pc which will still be on VA. To
+ * deal with this we set stvec to the physical address at
+ * the start of the loop below so that we jump there in
+ * any case.
+ */
+ la s8, 1f
+ sub s8, s8, s7
+ csrw CSR_STVEC, s8
+
+ /* Process entries in a loop */
+.align 2
+1:
+ addi s10, s10, 1
+ REG_L t0, 0(s0) /* t0 = *image->entry */
+ addi s0, s0, RISCV_SZPTR /* image->entry++ */
+
+ /* IND_DESTINATION entry ? -> save destination address */
+ andi t1, t0, 0x1
+ beqz t1, 2f
+ andi s4, t0, ~0x1
+ j 1b
+
+2:
+ /* IND_INDIRECTION entry ? -> update next entry ptr (PA) */
+ andi t1, t0, 0x2
+ beqz t1, 2f
+ andi s0, t0, ~0x2
+ addi s9, s9, 1
+ csrw CSR_SATP, zero
+ jalr zero, s8, 0
+
+2:
+ /* IND_DONE entry ? -> jump to done label */
+ andi t1, t0, 0x4
+ beqz t1, 2f
+ j 4f
+
+2:
+ /*
+ * IND_SOURCE entry ? -> copy page word by word to the
+ * destination address we got from IND_DESTINATION
+ */
+ andi t1, t0, 0x8
+ beqz t1, 1b /* Unknown entry type, ignore it */
+ andi t0, t0, ~0x8
+ mv t3, s5 /* i = num words per page */
+3: /* copy loop */
+ REG_L t1, (t0) /* t1 = *src_ptr */
+ REG_S t1, (s4) /* *dst_ptr = *src_ptr */
+ addi t0, t0, RISCV_SZPTR /* stc_ptr++ */
+ addi s4, s4, RISCV_SZPTR /* dst_ptr++ */
+ sub t3, t3, s6 /* i-- */
+ addi s11, s11, 1 /* c++ */
+ beqz t3, 1b /* copy done ? */
+ j 3b
+
+4:
+ /* Pass the arguments to the next kernel / Cleanup*/
+ mv a0, s3
+ mv a1, s2
+ mv a2, s1
+
+ /* Cleanup */
+ mv a3, zero
+ mv a4, zero
+ mv a5, zero
+ mv a6, zero
+ mv a7, zero
+
+ mv s0, zero
+ mv s1, zero
+ mv s2, zero
+ mv s3, zero
+ mv s4, zero
+ mv s5, zero
+ mv s6, zero
+ mv s7, zero
+ mv s8, zero
+ mv s9, zero
+ mv s10, zero
+ mv s11, zero
+
+ mv t0, zero
+ mv t1, zero
+ mv t2, zero
+ mv t3, zero
+ mv t4, zero
+ mv t5, zero
+ mv t6, zero
+ csrw CSR_SEPC, zero
+ csrw CSR_SCAUSE, zero
+ csrw CSR_SSCRATCH, zero
+
+ /*
+ * Make sure the relocated code is visible
+ * and jump to the new kernel
+ */
+ fence.i
+
+ jalr zero, a2, 0
+
+SYM_CODE_END(riscv_kexec_relocate)
+riscv_kexec_relocate_end:
+
+
+/* Used for jumping to crashkernel */
+.section ".text"
+SYM_CODE_START(riscv_kexec_norelocate)
+ /*
+ * s0: (const) Phys address to jump to
+ * s1: (const) Phys address of the FDT image
+ * s2: (const) The hartid of the current hart
+ */
+ mv s0, a1
+ mv s1, a2
+ mv s2, a3
+
+ /* Disable / cleanup interrupts */
+ csrw CSR_SIE, zero
+ csrw CSR_SIP, zero
+
+ /* Pass the arguments to the next kernel / Cleanup*/
+ mv a0, s2
+ mv a1, s1
+ mv a2, s0
+
+ /* Cleanup */
+ mv a3, zero
+ mv a4, zero
+ mv a5, zero
+ mv a6, zero
+ mv a7, zero
+
+ mv s0, zero
+ mv s1, zero
+ mv s2, zero
+ mv s3, zero
+ mv s4, zero
+ mv s5, zero
+ mv s6, zero
+ mv s7, zero
+ mv s8, zero
+ mv s9, zero
+ mv s10, zero
+ mv s11, zero
+
+ mv t0, zero
+ mv t1, zero
+ mv t2, zero
+ mv t3, zero
+ mv t4, zero
+ mv t5, zero
+ mv t6, zero
+ csrw CSR_SEPC, zero
+ csrw CSR_SCAUSE, zero
+ csrw CSR_SSCRATCH, zero
+
+ /*
+ * Switch to physical addressing
+ * This will also trigger a jump to CSR_STVEC
+ * which in this case is the address of the new
+ * kernel.
+ */
+ csrw CSR_STVEC, a2
+ csrw CSR_SATP, zero
+
+SYM_CODE_END(riscv_kexec_norelocate)
+
+.section ".rodata"
+SYM_DATA(riscv_kexec_relocate_size,
+ .long riscv_kexec_relocate_end - riscv_kexec_relocate)
+
diff --git a/arch/riscv/kernel/kgdb.c b/arch/riscv/kernel/kgdb.c
new file mode 100644
index 000000000..963ed7edc
--- /dev/null
+++ b/arch/riscv/kernel/kgdb.c
@@ -0,0 +1,390 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 SiFive
+ */
+
+#include <linux/ptrace.h>
+#include <linux/kdebug.h>
+#include <linux/bug.h>
+#include <linux/kgdb.h>
+#include <linux/irqflags.h>
+#include <linux/string.h>
+#include <asm/cacheflush.h>
+#include <asm/gdb_xml.h>
+#include <asm/parse_asm.h>
+
+enum {
+ NOT_KGDB_BREAK = 0,
+ KGDB_SW_BREAK,
+ KGDB_COMPILED_BREAK,
+ KGDB_SW_SINGLE_STEP
+};
+
+static unsigned long stepped_address;
+static unsigned int stepped_opcode;
+
+#if __riscv_xlen == 32
+/* C.JAL is an RV32C-only instruction */
+DECLARE_INSN(c_jal, MATCH_C_JAL, MASK_C_JAL)
+#else
+#define is_c_jal_insn(opcode) 0
+#endif
+DECLARE_INSN(jalr, MATCH_JALR, MASK_JALR)
+DECLARE_INSN(jal, MATCH_JAL, MASK_JAL)
+DECLARE_INSN(c_jr, MATCH_C_JR, MASK_C_JR)
+DECLARE_INSN(c_jalr, MATCH_C_JALR, MASK_C_JALR)
+DECLARE_INSN(c_j, MATCH_C_J, MASK_C_J)
+DECLARE_INSN(beq, MATCH_BEQ, MASK_BEQ)
+DECLARE_INSN(bne, MATCH_BNE, MASK_BNE)
+DECLARE_INSN(blt, MATCH_BLT, MASK_BLT)
+DECLARE_INSN(bge, MATCH_BGE, MASK_BGE)
+DECLARE_INSN(bltu, MATCH_BLTU, MASK_BLTU)
+DECLARE_INSN(bgeu, MATCH_BGEU, MASK_BGEU)
+DECLARE_INSN(c_beqz, MATCH_C_BEQZ, MASK_C_BEQZ)
+DECLARE_INSN(c_bnez, MATCH_C_BNEZ, MASK_C_BNEZ)
+DECLARE_INSN(sret, MATCH_SRET, MASK_SRET)
+
+static int decode_register_index(unsigned long opcode, int offset)
+{
+ return (opcode >> offset) & 0x1F;
+}
+
+static int decode_register_index_short(unsigned long opcode, int offset)
+{
+ return ((opcode >> offset) & 0x7) + 8;
+}
+
+/* Calculate the new address for after a step */
+static int get_step_address(struct pt_regs *regs, unsigned long *next_addr)
+{
+ unsigned long pc = regs->epc;
+ unsigned long *regs_ptr = (unsigned long *)regs;
+ unsigned int rs1_num, rs2_num;
+ int op_code;
+
+ if (get_kernel_nofault(op_code, (void *)pc))
+ return -EINVAL;
+ if ((op_code & __INSN_LENGTH_MASK) != __INSN_LENGTH_GE_32) {
+ if (is_c_jalr_insn(op_code) || is_c_jr_insn(op_code)) {
+ rs1_num = decode_register_index(op_code, RVC_C2_RS1_OPOFF);
+ *next_addr = regs_ptr[rs1_num];
+ } else if (is_c_j_insn(op_code) || is_c_jal_insn(op_code)) {
+ *next_addr = EXTRACT_RVC_J_IMM(op_code) + pc;
+ } else if (is_c_beqz_insn(op_code)) {
+ rs1_num = decode_register_index_short(op_code,
+ RVC_C1_RS1_OPOFF);
+ if (!rs1_num || regs_ptr[rs1_num] == 0)
+ *next_addr = EXTRACT_RVC_B_IMM(op_code) + pc;
+ else
+ *next_addr = pc + 2;
+ } else if (is_c_bnez_insn(op_code)) {
+ rs1_num =
+ decode_register_index_short(op_code, RVC_C1_RS1_OPOFF);
+ if (rs1_num && regs_ptr[rs1_num] != 0)
+ *next_addr = EXTRACT_RVC_B_IMM(op_code) + pc;
+ else
+ *next_addr = pc + 2;
+ } else {
+ *next_addr = pc + 2;
+ }
+ } else {
+ if ((op_code & __INSN_OPCODE_MASK) == __INSN_BRANCH_OPCODE) {
+ bool result = false;
+ long imm = EXTRACT_BTYPE_IMM(op_code);
+ unsigned long rs1_val = 0, rs2_val = 0;
+
+ rs1_num = decode_register_index(op_code, RVG_RS1_OPOFF);
+ rs2_num = decode_register_index(op_code, RVG_RS2_OPOFF);
+ if (rs1_num)
+ rs1_val = regs_ptr[rs1_num];
+ if (rs2_num)
+ rs2_val = regs_ptr[rs2_num];
+
+ if (is_beq_insn(op_code))
+ result = (rs1_val == rs2_val) ? true : false;
+ else if (is_bne_insn(op_code))
+ result = (rs1_val != rs2_val) ? true : false;
+ else if (is_blt_insn(op_code))
+ result =
+ ((long)rs1_val <
+ (long)rs2_val) ? true : false;
+ else if (is_bge_insn(op_code))
+ result =
+ ((long)rs1_val >=
+ (long)rs2_val) ? true : false;
+ else if (is_bltu_insn(op_code))
+ result = (rs1_val < rs2_val) ? true : false;
+ else if (is_bgeu_insn(op_code))
+ result = (rs1_val >= rs2_val) ? true : false;
+ if (result)
+ *next_addr = imm + pc;
+ else
+ *next_addr = pc + 4;
+ } else if (is_jal_insn(op_code)) {
+ *next_addr = EXTRACT_JTYPE_IMM(op_code) + pc;
+ } else if (is_jalr_insn(op_code)) {
+ rs1_num = decode_register_index(op_code, RVG_RS1_OPOFF);
+ if (rs1_num)
+ *next_addr = ((unsigned long *)regs)[rs1_num];
+ *next_addr += EXTRACT_ITYPE_IMM(op_code);
+ } else if (is_sret_insn(op_code)) {
+ *next_addr = pc;
+ } else {
+ *next_addr = pc + 4;
+ }
+ }
+ return 0;
+}
+
+static int do_single_step(struct pt_regs *regs)
+{
+ /* Determine where the target instruction will send us to */
+ unsigned long addr = 0;
+ int error = get_step_address(regs, &addr);
+
+ if (error)
+ return error;
+
+ /* Store the op code in the stepped address */
+ error = get_kernel_nofault(stepped_opcode, (void *)addr);
+ if (error)
+ return error;
+
+ stepped_address = addr;
+
+ /* Replace the op code with the break instruction */
+ error = copy_to_kernel_nofault((void *)stepped_address,
+ arch_kgdb_ops.gdb_bpt_instr,
+ BREAK_INSTR_SIZE);
+ /* Flush and return */
+ if (!error) {
+ flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
+ kgdb_single_step = 1;
+ atomic_set(&kgdb_cpu_doing_single_step,
+ raw_smp_processor_id());
+ } else {
+ stepped_address = 0;
+ stepped_opcode = 0;
+ }
+ return error;
+}
+
+/* Undo a single step */
+static void undo_single_step(struct pt_regs *regs)
+{
+ if (stepped_opcode != 0) {
+ copy_to_kernel_nofault((void *)stepped_address,
+ (void *)&stepped_opcode, BREAK_INSTR_SIZE);
+ flush_icache_range(stepped_address,
+ stepped_address + BREAK_INSTR_SIZE);
+ }
+ stepped_address = 0;
+ stepped_opcode = 0;
+ kgdb_single_step = 0;
+ atomic_set(&kgdb_cpu_doing_single_step, -1);
+}
+
+struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
+ {DBG_REG_ZERO, GDB_SIZEOF_REG, -1},
+ {DBG_REG_RA, GDB_SIZEOF_REG, offsetof(struct pt_regs, ra)},
+ {DBG_REG_SP, GDB_SIZEOF_REG, offsetof(struct pt_regs, sp)},
+ {DBG_REG_GP, GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)},
+ {DBG_REG_TP, GDB_SIZEOF_REG, offsetof(struct pt_regs, tp)},
+ {DBG_REG_T0, GDB_SIZEOF_REG, offsetof(struct pt_regs, t0)},
+ {DBG_REG_T1, GDB_SIZEOF_REG, offsetof(struct pt_regs, t1)},
+ {DBG_REG_T2, GDB_SIZEOF_REG, offsetof(struct pt_regs, t2)},
+ {DBG_REG_FP, GDB_SIZEOF_REG, offsetof(struct pt_regs, s0)},
+ {DBG_REG_S1, GDB_SIZEOF_REG, offsetof(struct pt_regs, a1)},
+ {DBG_REG_A0, GDB_SIZEOF_REG, offsetof(struct pt_regs, a0)},
+ {DBG_REG_A1, GDB_SIZEOF_REG, offsetof(struct pt_regs, a1)},
+ {DBG_REG_A2, GDB_SIZEOF_REG, offsetof(struct pt_regs, a2)},
+ {DBG_REG_A3, GDB_SIZEOF_REG, offsetof(struct pt_regs, a3)},
+ {DBG_REG_A4, GDB_SIZEOF_REG, offsetof(struct pt_regs, a4)},
+ {DBG_REG_A5, GDB_SIZEOF_REG, offsetof(struct pt_regs, a5)},
+ {DBG_REG_A6, GDB_SIZEOF_REG, offsetof(struct pt_regs, a6)},
+ {DBG_REG_A7, GDB_SIZEOF_REG, offsetof(struct pt_regs, a7)},
+ {DBG_REG_S2, GDB_SIZEOF_REG, offsetof(struct pt_regs, s2)},
+ {DBG_REG_S3, GDB_SIZEOF_REG, offsetof(struct pt_regs, s3)},
+ {DBG_REG_S4, GDB_SIZEOF_REG, offsetof(struct pt_regs, s4)},
+ {DBG_REG_S5, GDB_SIZEOF_REG, offsetof(struct pt_regs, s5)},
+ {DBG_REG_S6, GDB_SIZEOF_REG, offsetof(struct pt_regs, s6)},
+ {DBG_REG_S7, GDB_SIZEOF_REG, offsetof(struct pt_regs, s7)},
+ {DBG_REG_S8, GDB_SIZEOF_REG, offsetof(struct pt_regs, s8)},
+ {DBG_REG_S9, GDB_SIZEOF_REG, offsetof(struct pt_regs, s9)},
+ {DBG_REG_S10, GDB_SIZEOF_REG, offsetof(struct pt_regs, s10)},
+ {DBG_REG_S11, GDB_SIZEOF_REG, offsetof(struct pt_regs, s11)},
+ {DBG_REG_T3, GDB_SIZEOF_REG, offsetof(struct pt_regs, t3)},
+ {DBG_REG_T4, GDB_SIZEOF_REG, offsetof(struct pt_regs, t4)},
+ {DBG_REG_T5, GDB_SIZEOF_REG, offsetof(struct pt_regs, t5)},
+ {DBG_REG_T6, GDB_SIZEOF_REG, offsetof(struct pt_regs, t6)},
+ {DBG_REG_EPC, GDB_SIZEOF_REG, offsetof(struct pt_regs, epc)},
+ {DBG_REG_STATUS, GDB_SIZEOF_REG, offsetof(struct pt_regs, status)},
+ {DBG_REG_BADADDR, GDB_SIZEOF_REG, offsetof(struct pt_regs, badaddr)},
+ {DBG_REG_CAUSE, GDB_SIZEOF_REG, offsetof(struct pt_regs, cause)},
+};
+
+char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
+{
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return NULL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
+ dbg_reg_def[regno].size);
+ else
+ memset(mem, 0, dbg_reg_def[regno].size);
+ return dbg_reg_def[regno].name;
+}
+
+int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
+{
+ if (regno >= DBG_MAX_REG_NUM || regno < 0)
+ return -EINVAL;
+
+ if (dbg_reg_def[regno].offset != -1)
+ memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
+ dbg_reg_def[regno].size);
+ return 0;
+}
+
+void
+sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
+{
+ /* Initialize to zero */
+ memset((char *)gdb_regs, 0, NUMREGBYTES);
+
+ gdb_regs[DBG_REG_SP_OFF] = task->thread.sp;
+ gdb_regs[DBG_REG_FP_OFF] = task->thread.s[0];
+ gdb_regs[DBG_REG_S1_OFF] = task->thread.s[1];
+ gdb_regs[DBG_REG_S2_OFF] = task->thread.s[2];
+ gdb_regs[DBG_REG_S3_OFF] = task->thread.s[3];
+ gdb_regs[DBG_REG_S4_OFF] = task->thread.s[4];
+ gdb_regs[DBG_REG_S5_OFF] = task->thread.s[5];
+ gdb_regs[DBG_REG_S6_OFF] = task->thread.s[6];
+ gdb_regs[DBG_REG_S7_OFF] = task->thread.s[7];
+ gdb_regs[DBG_REG_S8_OFF] = task->thread.s[8];
+ gdb_regs[DBG_REG_S9_OFF] = task->thread.s[10];
+ gdb_regs[DBG_REG_S10_OFF] = task->thread.s[11];
+ gdb_regs[DBG_REG_EPC_OFF] = task->thread.ra;
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
+{
+ regs->epc = pc;
+}
+
+void kgdb_arch_handle_qxfer_pkt(char *remcom_in_buffer,
+ char *remcom_out_buffer)
+{
+ if (!strncmp(remcom_in_buffer, gdb_xfer_read_target,
+ sizeof(gdb_xfer_read_target)))
+ strcpy(remcom_out_buffer, riscv_gdb_stub_target_desc);
+ else if (!strncmp(remcom_in_buffer, gdb_xfer_read_cpuxml,
+ sizeof(gdb_xfer_read_cpuxml)))
+ strcpy(remcom_out_buffer, riscv_gdb_stub_cpuxml);
+}
+
+static inline void kgdb_arch_update_addr(struct pt_regs *regs,
+ char *remcom_in_buffer)
+{
+ unsigned long addr;
+ char *ptr;
+
+ ptr = &remcom_in_buffer[1];
+ if (kgdb_hex2long(&ptr, &addr))
+ regs->epc = addr;
+}
+
+int kgdb_arch_handle_exception(int vector, int signo, int err_code,
+ char *remcom_in_buffer, char *remcom_out_buffer,
+ struct pt_regs *regs)
+{
+ int err = 0;
+
+ undo_single_step(regs);
+
+ switch (remcom_in_buffer[0]) {
+ case 'c':
+ case 'D':
+ case 'k':
+ if (remcom_in_buffer[0] == 'c')
+ kgdb_arch_update_addr(regs, remcom_in_buffer);
+ break;
+ case 's':
+ kgdb_arch_update_addr(regs, remcom_in_buffer);
+ err = do_single_step(regs);
+ break;
+ default:
+ err = -1;
+ }
+ return err;
+}
+
+static int kgdb_riscv_kgdbbreak(unsigned long addr)
+{
+ if (stepped_address == addr)
+ return KGDB_SW_SINGLE_STEP;
+ if (atomic_read(&kgdb_setting_breakpoint))
+ if (addr == (unsigned long)&kgdb_compiled_break)
+ return KGDB_COMPILED_BREAK;
+
+ return kgdb_has_hit_break(addr);
+}
+
+static int kgdb_riscv_notify(struct notifier_block *self, unsigned long cmd,
+ void *ptr)
+{
+ struct die_args *args = (struct die_args *)ptr;
+ struct pt_regs *regs = args->regs;
+ unsigned long flags;
+ int type;
+
+ if (user_mode(regs))
+ return NOTIFY_DONE;
+
+ type = kgdb_riscv_kgdbbreak(regs->epc);
+ if (type == NOT_KGDB_BREAK && cmd == DIE_TRAP)
+ return NOTIFY_DONE;
+
+ local_irq_save(flags);
+
+ if (kgdb_handle_exception(type == KGDB_SW_SINGLE_STEP ? 0 : 1,
+ args->signr, cmd, regs))
+ return NOTIFY_DONE;
+
+ if (type == KGDB_COMPILED_BREAK)
+ regs->epc += 4;
+
+ local_irq_restore(flags);
+
+ return NOTIFY_STOP;
+}
+
+static struct notifier_block kgdb_notifier = {
+ .notifier_call = kgdb_riscv_notify,
+};
+
+int kgdb_arch_init(void)
+{
+ register_die_notifier(&kgdb_notifier);
+
+ return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+ unregister_die_notifier(&kgdb_notifier);
+}
+
+/*
+ * Global data
+ */
+#ifdef CONFIG_RISCV_ISA_C
+const struct kgdb_arch arch_kgdb_ops = {
+ .gdb_bpt_instr = {0x02, 0x90}, /* c.ebreak */
+};
+#else
+const struct kgdb_arch arch_kgdb_ops = {
+ .gdb_bpt_instr = {0x73, 0x00, 0x10, 0x00}, /* ebreak */
+};
+#endif
diff --git a/arch/riscv/kernel/machine_kexec.c b/arch/riscv/kernel/machine_kexec.c
new file mode 100644
index 000000000..2d139b724
--- /dev/null
+++ b/arch/riscv/kernel/machine_kexec.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 FORTH-ICS/CARV
+ * Nick Kossifidis <mick@ics.forth.gr>
+ */
+
+#include <linux/kexec.h>
+#include <asm/kexec.h> /* For riscv_kexec_* symbol defines */
+#include <linux/smp.h> /* For smp_send_stop () */
+#include <asm/cacheflush.h> /* For local_flush_icache_all() */
+#include <asm/barrier.h> /* For smp_wmb() */
+#include <asm/page.h> /* For PAGE_MASK */
+#include <linux/libfdt.h> /* For fdt_check_header() */
+#include <asm/set_memory.h> /* For set_memory_x() */
+#include <linux/compiler.h> /* For unreachable() */
+#include <linux/cpu.h> /* For cpu_down() */
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+/*
+ * kexec_image_info - Print received image details
+ */
+static void
+kexec_image_info(const struct kimage *image)
+{
+ unsigned long i;
+
+ pr_debug("Kexec image info:\n");
+ pr_debug("\ttype: %d\n", image->type);
+ pr_debug("\tstart: %lx\n", image->start);
+ pr_debug("\thead: %lx\n", image->head);
+ pr_debug("\tnr_segments: %lu\n", image->nr_segments);
+
+ for (i = 0; i < image->nr_segments; i++) {
+ pr_debug("\t segment[%lu]: %016lx - %016lx", i,
+ image->segment[i].mem,
+ image->segment[i].mem + image->segment[i].memsz);
+ pr_debug("\t\t0x%lx bytes, %lu pages\n",
+ (unsigned long) image->segment[i].memsz,
+ (unsigned long) image->segment[i].memsz / PAGE_SIZE);
+ }
+}
+
+/*
+ * machine_kexec_prepare - Initialize kexec
+ *
+ * This function is called from do_kexec_load, when the user has
+ * provided us with an image to be loaded. Its goal is to validate
+ * the image and prepare the control code buffer as needed.
+ * Note that kimage_alloc_init has already been called and the
+ * control buffer has already been allocated.
+ */
+int
+machine_kexec_prepare(struct kimage *image)
+{
+ struct kimage_arch *internal = &image->arch;
+ struct fdt_header fdt = {0};
+ void *control_code_buffer = NULL;
+ unsigned int control_code_buffer_sz = 0;
+ int i = 0;
+
+ kexec_image_info(image);
+
+ /* Find the Flattened Device Tree and save its physical address */
+ for (i = 0; i < image->nr_segments; i++) {
+ if (image->segment[i].memsz <= sizeof(fdt))
+ continue;
+
+ if (image->file_mode)
+ memcpy(&fdt, image->segment[i].buf, sizeof(fdt));
+ else if (copy_from_user(&fdt, image->segment[i].buf, sizeof(fdt)))
+ continue;
+
+ if (fdt_check_header(&fdt))
+ continue;
+
+ internal->fdt_addr = (unsigned long) image->segment[i].mem;
+ break;
+ }
+
+ if (!internal->fdt_addr) {
+ pr_err("Device tree not included in the provided image\n");
+ return -EINVAL;
+ }
+
+ /* Copy the assembler code for relocation to the control page */
+ if (image->type != KEXEC_TYPE_CRASH) {
+ control_code_buffer = page_address(image->control_code_page);
+ control_code_buffer_sz = page_size(image->control_code_page);
+
+ if (unlikely(riscv_kexec_relocate_size > control_code_buffer_sz)) {
+ pr_err("Relocation code doesn't fit within a control page\n");
+ return -EINVAL;
+ }
+
+ memcpy(control_code_buffer, riscv_kexec_relocate,
+ riscv_kexec_relocate_size);
+
+ /* Mark the control page executable */
+ set_memory_x((unsigned long) control_code_buffer, 1);
+ }
+
+ return 0;
+}
+
+
+/*
+ * machine_kexec_cleanup - Cleanup any leftovers from
+ * machine_kexec_prepare
+ *
+ * This function is called by kimage_free to handle any arch-specific
+ * allocations done on machine_kexec_prepare. Since we didn't do any
+ * allocations there, this is just an empty function. Note that the
+ * control buffer is freed by kimage_free.
+ */
+void
+machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+
+/*
+ * machine_shutdown - Prepare for a kexec reboot
+ *
+ * This function is called by kernel_kexec just before machine_kexec
+ * below. Its goal is to prepare the rest of the system (the other
+ * harts and possibly devices etc) for a kexec reboot.
+ */
+void machine_shutdown(void)
+{
+ /*
+ * No more interrupts on this hart
+ * until we are back up.
+ */
+ local_irq_disable();
+
+#if defined(CONFIG_HOTPLUG_CPU)
+ smp_shutdown_nonboot_cpus(smp_processor_id());
+#endif
+}
+
+static void machine_kexec_mask_interrupts(void)
+{
+ unsigned int i;
+ struct irq_desc *desc;
+
+ for_each_irq_desc(i, desc) {
+ struct irq_chip *chip;
+ int ret;
+
+ chip = irq_desc_get_chip(desc);
+ if (!chip)
+ continue;
+
+ /*
+ * First try to remove the active state. If this
+ * fails, try to EOI the interrupt.
+ */
+ ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
+
+ if (ret && irqd_irq_inprogress(&desc->irq_data) &&
+ chip->irq_eoi)
+ chip->irq_eoi(&desc->irq_data);
+
+ if (chip->irq_mask)
+ chip->irq_mask(&desc->irq_data);
+
+ if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
+ chip->irq_disable(&desc->irq_data);
+ }
+}
+
+/*
+ * machine_crash_shutdown - Prepare to kexec after a kernel crash
+ *
+ * This function is called by crash_kexec just before machine_kexec
+ * and its goal is to shutdown non-crashing cpus and save registers.
+ */
+void
+machine_crash_shutdown(struct pt_regs *regs)
+{
+ local_irq_disable();
+
+ /* shutdown non-crashing cpus */
+ crash_smp_send_stop();
+
+ crash_save_cpu(regs, smp_processor_id());
+ machine_kexec_mask_interrupts();
+
+ pr_info("Starting crashdump kernel...\n");
+}
+
+/*
+ * machine_kexec - Jump to the loaded kimage
+ *
+ * This function is called by kernel_kexec which is called by the
+ * reboot system call when the reboot cmd is LINUX_REBOOT_CMD_KEXEC,
+ * or by crash_kernel which is called by the kernel's arch-specific
+ * trap handler in case of a kernel panic. It's the final stage of
+ * the kexec process where the pre-loaded kimage is ready to be
+ * executed. We assume at this point that all other harts are
+ * suspended and this hart will be the new boot hart.
+ */
+void __noreturn
+machine_kexec(struct kimage *image)
+{
+ struct kimage_arch *internal = &image->arch;
+ unsigned long jump_addr = (unsigned long) image->start;
+ unsigned long first_ind_entry = (unsigned long) &image->head;
+ unsigned long this_cpu_id = __smp_processor_id();
+ unsigned long this_hart_id = cpuid_to_hartid_map(this_cpu_id);
+ unsigned long fdt_addr = internal->fdt_addr;
+ void *control_code_buffer = page_address(image->control_code_page);
+ riscv_kexec_method kexec_method = NULL;
+
+#ifdef CONFIG_SMP
+ WARN(smp_crash_stop_failed(),
+ "Some CPUs may be stale, kdump will be unreliable.\n");
+#endif
+
+ if (image->type != KEXEC_TYPE_CRASH)
+ kexec_method = control_code_buffer;
+ else
+ kexec_method = (riscv_kexec_method) &riscv_kexec_norelocate;
+
+ pr_notice("Will call new kernel at %08lx from hart id %lx\n",
+ jump_addr, this_hart_id);
+ pr_notice("FDT image at %08lx\n", fdt_addr);
+
+ /* Make sure the relocation code is visible to the hart */
+ local_flush_icache_all();
+
+ /* Jump to the relocation code */
+ pr_notice("Bye...\n");
+ kexec_method(first_ind_entry, jump_addr, fdt_addr,
+ this_hart_id, kernel_map.va_pa_offset);
+ unreachable();
+}
diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c
new file mode 100644
index 000000000..b0bf8c172
--- /dev/null
+++ b/arch/riscv/kernel/machine_kexec_file.c
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kexec_file for riscv, use vmlinux as the dump-capture kernel image.
+ *
+ * Copyright (C) 2021 Huawei Technologies Co, Ltd.
+ *
+ * Author: Liao Chang (liaochang1@huawei.com)
+ */
+#include <linux/kexec.h>
+
+const struct kexec_file_ops * const kexec_file_loaders[] = {
+ &elf_kexec_ops,
+ NULL
+};
diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S
new file mode 100644
index 000000000..125de818d
--- /dev/null
+++ b/arch/riscv/kernel/mcount-dyn.S
@@ -0,0 +1,191 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2017 Andes Technology Corporation */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/unistd.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+#include <asm-generic/export.h>
+#include <asm/ftrace.h>
+
+ .text
+
+#define FENTRY_RA_OFFSET 8
+#define ABI_SIZE_ON_STACK 80
+#define ABI_A0 0
+#define ABI_A1 8
+#define ABI_A2 16
+#define ABI_A3 24
+#define ABI_A4 32
+#define ABI_A5 40
+#define ABI_A6 48
+#define ABI_A7 56
+#define ABI_T0 64
+#define ABI_RA 72
+
+ .macro SAVE_ABI
+ addi sp, sp, -ABI_SIZE_ON_STACK
+
+ REG_S a0, ABI_A0(sp)
+ REG_S a1, ABI_A1(sp)
+ REG_S a2, ABI_A2(sp)
+ REG_S a3, ABI_A3(sp)
+ REG_S a4, ABI_A4(sp)
+ REG_S a5, ABI_A5(sp)
+ REG_S a6, ABI_A6(sp)
+ REG_S a7, ABI_A7(sp)
+ REG_S t0, ABI_T0(sp)
+ REG_S ra, ABI_RA(sp)
+ .endm
+
+ .macro RESTORE_ABI
+ REG_L a0, ABI_A0(sp)
+ REG_L a1, ABI_A1(sp)
+ REG_L a2, ABI_A2(sp)
+ REG_L a3, ABI_A3(sp)
+ REG_L a4, ABI_A4(sp)
+ REG_L a5, ABI_A5(sp)
+ REG_L a6, ABI_A6(sp)
+ REG_L a7, ABI_A7(sp)
+ REG_L t0, ABI_T0(sp)
+ REG_L ra, ABI_RA(sp)
+
+ addi sp, sp, ABI_SIZE_ON_STACK
+ .endm
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+ .macro SAVE_ALL
+ addi sp, sp, -PT_SIZE_ON_STACK
+
+ REG_S t0, PT_EPC(sp)
+ REG_S x1, PT_RA(sp)
+ REG_S x2, PT_SP(sp)
+ REG_S x3, PT_GP(sp)
+ REG_S x4, PT_TP(sp)
+ REG_S x5, PT_T0(sp)
+ REG_S x6, PT_T1(sp)
+ REG_S x7, PT_T2(sp)
+ REG_S x8, PT_S0(sp)
+ REG_S x9, PT_S1(sp)
+ REG_S x10, PT_A0(sp)
+ REG_S x11, PT_A1(sp)
+ REG_S x12, PT_A2(sp)
+ REG_S x13, PT_A3(sp)
+ REG_S x14, PT_A4(sp)
+ REG_S x15, PT_A5(sp)
+ REG_S x16, PT_A6(sp)
+ REG_S x17, PT_A7(sp)
+ REG_S x18, PT_S2(sp)
+ REG_S x19, PT_S3(sp)
+ REG_S x20, PT_S4(sp)
+ REG_S x21, PT_S5(sp)
+ REG_S x22, PT_S6(sp)
+ REG_S x23, PT_S7(sp)
+ REG_S x24, PT_S8(sp)
+ REG_S x25, PT_S9(sp)
+ REG_S x26, PT_S10(sp)
+ REG_S x27, PT_S11(sp)
+ REG_S x28, PT_T3(sp)
+ REG_S x29, PT_T4(sp)
+ REG_S x30, PT_T5(sp)
+ REG_S x31, PT_T6(sp)
+ .endm
+
+ .macro RESTORE_ALL
+ REG_L t0, PT_EPC(sp)
+ REG_L x1, PT_RA(sp)
+ REG_L x2, PT_SP(sp)
+ REG_L x3, PT_GP(sp)
+ REG_L x4, PT_TP(sp)
+ REG_L x6, PT_T1(sp)
+ REG_L x7, PT_T2(sp)
+ REG_L x8, PT_S0(sp)
+ REG_L x9, PT_S1(sp)
+ REG_L x10, PT_A0(sp)
+ REG_L x11, PT_A1(sp)
+ REG_L x12, PT_A2(sp)
+ REG_L x13, PT_A3(sp)
+ REG_L x14, PT_A4(sp)
+ REG_L x15, PT_A5(sp)
+ REG_L x16, PT_A6(sp)
+ REG_L x17, PT_A7(sp)
+ REG_L x18, PT_S2(sp)
+ REG_L x19, PT_S3(sp)
+ REG_L x20, PT_S4(sp)
+ REG_L x21, PT_S5(sp)
+ REG_L x22, PT_S6(sp)
+ REG_L x23, PT_S7(sp)
+ REG_L x24, PT_S8(sp)
+ REG_L x25, PT_S9(sp)
+ REG_L x26, PT_S10(sp)
+ REG_L x27, PT_S11(sp)
+ REG_L x28, PT_T3(sp)
+ REG_L x29, PT_T4(sp)
+ REG_L x30, PT_T5(sp)
+ REG_L x31, PT_T6(sp)
+
+ addi sp, sp, PT_SIZE_ON_STACK
+ .endm
+#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
+
+ENTRY(ftrace_caller)
+ SAVE_ABI
+
+ addi a0, t0, -FENTRY_RA_OFFSET
+ la a1, function_trace_op
+ REG_L a2, 0(a1)
+ mv a1, ra
+ mv a3, sp
+
+ftrace_call:
+ .global ftrace_call
+ call ftrace_stub
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ addi a0, sp, ABI_RA
+ REG_L a1, ABI_T0(sp)
+ addi a1, a1, -FENTRY_RA_OFFSET
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ mv a2, s0
+#endif
+ftrace_graph_call:
+ .global ftrace_graph_call
+ call ftrace_stub
+#endif
+ RESTORE_ABI
+ jr t0
+ENDPROC(ftrace_caller)
+
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
+ENTRY(ftrace_regs_caller)
+ SAVE_ALL
+
+ addi a0, t0, -FENTRY_RA_OFFSET
+ la a1, function_trace_op
+ REG_L a2, 0(a1)
+ mv a1, ra
+ mv a3, sp
+
+ftrace_regs_call:
+ .global ftrace_regs_call
+ call ftrace_stub
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ addi a0, sp, PT_RA
+ REG_L a1, PT_EPC(sp)
+ addi a1, a1, -FENTRY_RA_OFFSET
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ mv a2, s0
+#endif
+ftrace_graph_regs_call:
+ .global ftrace_graph_regs_call
+ call ftrace_stub
+#endif
+
+ RESTORE_ALL
+ jr t0
+ENDPROC(ftrace_regs_caller)
+#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
diff --git a/arch/riscv/kernel/mcount.S b/arch/riscv/kernel/mcount.S
new file mode 100644
index 000000000..6d462681c
--- /dev/null
+++ b/arch/riscv/kernel/mcount.S
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2017 Andes Technology Corporation */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/asm.h>
+#include <asm/csr.h>
+#include <asm/unistd.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+#include <asm-generic/export.h>
+#include <asm/ftrace.h>
+
+ .text
+
+ .macro SAVE_ABI_STATE
+ addi sp, sp, -16
+ sd s0, 0(sp)
+ sd ra, 8(sp)
+ addi s0, sp, 16
+ .endm
+
+ /*
+ * The call to ftrace_return_to_handler would overwrite the return
+ * register if a0 was not saved.
+ */
+ .macro SAVE_RET_ABI_STATE
+ addi sp, sp, -32
+ sd s0, 16(sp)
+ sd ra, 24(sp)
+ sd a0, 8(sp)
+ addi s0, sp, 32
+ .endm
+
+ .macro RESTORE_ABI_STATE
+ ld ra, 8(sp)
+ ld s0, 0(sp)
+ addi sp, sp, 16
+ .endm
+
+ .macro RESTORE_RET_ABI_STATE
+ ld ra, 24(sp)
+ ld s0, 16(sp)
+ ld a0, 8(sp)
+ addi sp, sp, 32
+ .endm
+
+ENTRY(ftrace_stub)
+#ifdef CONFIG_DYNAMIC_FTRACE
+ .global MCOUNT_NAME
+ .set MCOUNT_NAME, ftrace_stub
+#endif
+ ret
+ENDPROC(ftrace_stub)
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ENTRY(return_to_handler)
+/*
+ * On implementing the frame point test, the ideal way is to compare the
+ * s0 (frame pointer, if enabled) on entry and the sp (stack pointer) on return.
+ * However, the psABI of variable-length-argument functions does not allow this.
+ *
+ * So alternatively we check the *old* frame pointer position, that is, the
+ * value stored in -16(s0) on entry, and the s0 on return.
+ */
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ mv t6, s0
+#endif
+ SAVE_RET_ABI_STATE
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ mv a0, t6
+#endif
+ call ftrace_return_to_handler
+ mv a1, a0
+ RESTORE_RET_ABI_STATE
+ jalr a1
+ENDPROC(return_to_handler)
+#endif
+
+#ifndef CONFIG_DYNAMIC_FTRACE
+ENTRY(MCOUNT_NAME)
+ la t4, ftrace_stub
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ la t0, ftrace_graph_return
+ ld t1, 0(t0)
+ bne t1, t4, do_ftrace_graph_caller
+
+ la t3, ftrace_graph_entry
+ ld t2, 0(t3)
+ la t6, ftrace_graph_entry_stub
+ bne t2, t6, do_ftrace_graph_caller
+#endif
+ la t3, ftrace_trace_function
+ ld t5, 0(t3)
+ bne t5, t4, do_trace
+ ret
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+/*
+ * A pseudo representation for the function graph tracer:
+ * prepare_to_return(&ra_to_caller_of_caller, ra_to_caller)
+ */
+do_ftrace_graph_caller:
+ addi a0, s0, -8
+ mv a1, ra
+#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
+ ld a2, -16(s0)
+#endif
+ SAVE_ABI_STATE
+ call prepare_ftrace_return
+ RESTORE_ABI_STATE
+ ret
+#endif
+
+/*
+ * A pseudo representation for the function tracer:
+ * (*ftrace_trace_function)(ra_to_caller, ra_to_caller_of_caller)
+ */
+do_trace:
+ ld a1, -8(s0)
+ mv a0, ra
+
+ SAVE_ABI_STATE
+ jalr t5
+ RESTORE_ABI_STATE
+ ret
+ENDPROC(MCOUNT_NAME)
+#endif
+EXPORT_SYMBOL(MCOUNT_NAME)
diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
new file mode 100644
index 000000000..e264e59e5
--- /dev/null
+++ b/arch/riscv/kernel/module-sections.c
@@ -0,0 +1,159 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2014-2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ *
+ * Copyright (C) 2018 Andes Technology Corporation <zong@andestech.com>
+ */
+
+#include <linux/elf.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleloader.h>
+
+unsigned long module_emit_got_entry(struct module *mod, unsigned long val)
+{
+ struct mod_section *got_sec = &mod->arch.got;
+ int i = got_sec->num_entries;
+ struct got_entry *got = get_got_entry(val, got_sec);
+
+ if (got)
+ return (unsigned long)got;
+
+ /* There is no duplicate entry, create a new one */
+ got = (struct got_entry *)got_sec->shdr->sh_addr;
+ got[i] = emit_got_entry(val);
+
+ got_sec->num_entries++;
+ BUG_ON(got_sec->num_entries > got_sec->max_entries);
+
+ return (unsigned long)&got[i];
+}
+
+unsigned long module_emit_plt_entry(struct module *mod, unsigned long val)
+{
+ struct mod_section *got_plt_sec = &mod->arch.got_plt;
+ struct got_entry *got_plt;
+ struct mod_section *plt_sec = &mod->arch.plt;
+ struct plt_entry *plt = get_plt_entry(val, plt_sec, got_plt_sec);
+ int i = plt_sec->num_entries;
+
+ if (plt)
+ return (unsigned long)plt;
+
+ /* There is no duplicate entry, create a new one */
+ got_plt = (struct got_entry *)got_plt_sec->shdr->sh_addr;
+ got_plt[i] = emit_got_entry(val);
+ plt = (struct plt_entry *)plt_sec->shdr->sh_addr;
+ plt[i] = emit_plt_entry(val,
+ (unsigned long)&plt[i],
+ (unsigned long)&got_plt[i]);
+
+ plt_sec->num_entries++;
+ got_plt_sec->num_entries++;
+ BUG_ON(plt_sec->num_entries > plt_sec->max_entries);
+
+ return (unsigned long)&plt[i];
+}
+
+static int is_rela_equal(const Elf_Rela *x, const Elf_Rela *y)
+{
+ return x->r_info == y->r_info && x->r_addend == y->r_addend;
+}
+
+static bool duplicate_rela(const Elf_Rela *rela, int idx)
+{
+ int i;
+ for (i = 0; i < idx; i++) {
+ if (is_rela_equal(&rela[i], &rela[idx]))
+ return true;
+ }
+ return false;
+}
+
+static void count_max_entries(Elf_Rela *relas, int num,
+ unsigned int *plts, unsigned int *gots)
+{
+ unsigned int type, i;
+
+ for (i = 0; i < num; i++) {
+ type = ELF_RISCV_R_TYPE(relas[i].r_info);
+ if (type == R_RISCV_CALL_PLT) {
+ if (!duplicate_rela(relas, i))
+ (*plts)++;
+ } else if (type == R_RISCV_GOT_HI20) {
+ if (!duplicate_rela(relas, i))
+ (*gots)++;
+ }
+ }
+}
+
+int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
+ char *secstrings, struct module *mod)
+{
+ unsigned int num_plts = 0;
+ unsigned int num_gots = 0;
+ int i;
+
+ /*
+ * Find the empty .got and .plt sections.
+ */
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ if (!strcmp(secstrings + sechdrs[i].sh_name, ".plt"))
+ mod->arch.plt.shdr = sechdrs + i;
+ else if (!strcmp(secstrings + sechdrs[i].sh_name, ".got"))
+ mod->arch.got.shdr = sechdrs + i;
+ else if (!strcmp(secstrings + sechdrs[i].sh_name, ".got.plt"))
+ mod->arch.got_plt.shdr = sechdrs + i;
+ }
+
+ if (!mod->arch.plt.shdr) {
+ pr_err("%s: module PLT section(s) missing\n", mod->name);
+ return -ENOEXEC;
+ }
+ if (!mod->arch.got.shdr) {
+ pr_err("%s: module GOT section(s) missing\n", mod->name);
+ return -ENOEXEC;
+ }
+ if (!mod->arch.got_plt.shdr) {
+ pr_err("%s: module GOT.PLT section(s) missing\n", mod->name);
+ return -ENOEXEC;
+ }
+
+ /* Calculate the maxinum number of entries */
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ Elf_Rela *relas = (void *)ehdr + sechdrs[i].sh_offset;
+ int num_rela = sechdrs[i].sh_size / sizeof(Elf_Rela);
+ Elf_Shdr *dst_sec = sechdrs + sechdrs[i].sh_info;
+
+ if (sechdrs[i].sh_type != SHT_RELA)
+ continue;
+
+ /* ignore relocations that operate on non-exec sections */
+ if (!(dst_sec->sh_flags & SHF_EXECINSTR))
+ continue;
+
+ count_max_entries(relas, num_rela, &num_plts, &num_gots);
+ }
+
+ mod->arch.plt.shdr->sh_type = SHT_NOBITS;
+ mod->arch.plt.shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC;
+ mod->arch.plt.shdr->sh_addralign = L1_CACHE_BYTES;
+ mod->arch.plt.shdr->sh_size = (num_plts + 1) * sizeof(struct plt_entry);
+ mod->arch.plt.num_entries = 0;
+ mod->arch.plt.max_entries = num_plts;
+
+ mod->arch.got.shdr->sh_type = SHT_NOBITS;
+ mod->arch.got.shdr->sh_flags = SHF_ALLOC;
+ mod->arch.got.shdr->sh_addralign = L1_CACHE_BYTES;
+ mod->arch.got.shdr->sh_size = (num_gots + 1) * sizeof(struct got_entry);
+ mod->arch.got.num_entries = 0;
+ mod->arch.got.max_entries = num_gots;
+
+ mod->arch.got_plt.shdr->sh_type = SHT_NOBITS;
+ mod->arch.got_plt.shdr->sh_flags = SHF_ALLOC;
+ mod->arch.got_plt.shdr->sh_addralign = L1_CACHE_BYTES;
+ mod->arch.got_plt.shdr->sh_size = (num_plts + 1) * sizeof(struct got_entry);
+ mod->arch.got_plt.num_entries = 0;
+ mod->arch.got_plt.max_entries = num_plts;
+ return 0;
+}
diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
new file mode 100644
index 000000000..a331001e3
--- /dev/null
+++ b/arch/riscv/kernel/module.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) 2017 Zihao Yu
+ */
+
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/moduleloader.h>
+#include <linux/vmalloc.h>
+#include <linux/sizes.h>
+#include <linux/pgtable.h>
+#include <asm/alternative.h>
+#include <asm/sections.h>
+
+/*
+ * The auipc+jalr instruction pair can reach any PC-relative offset
+ * in the range [-2^31 - 2^11, 2^31 - 2^11)
+ */
+static bool riscv_insn_valid_32bit_offset(ptrdiff_t val)
+{
+#ifdef CONFIG_32BIT
+ return true;
+#else
+ return (-(1L << 31) - (1L << 11)) <= val && val < ((1L << 31) - (1L << 11));
+#endif
+}
+
+static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+ if (v != (u32)v) {
+ pr_err("%s: value %016llx out of range for 32-bit field\n",
+ me->name, (long long)v);
+ return -EINVAL;
+ }
+ *location = v;
+ return 0;
+}
+
+static int apply_r_riscv_64_rela(struct module *me, u32 *location, Elf_Addr v)
+{
+ *(u64 *)location = v;
+ return 0;
+}
+
+static int apply_r_riscv_branch_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u32 imm12 = (offset & 0x1000) << (31 - 12);
+ u32 imm11 = (offset & 0x800) >> (11 - 7);
+ u32 imm10_5 = (offset & 0x7e0) << (30 - 10);
+ u32 imm4_1 = (offset & 0x1e) << (11 - 4);
+
+ *location = (*location & 0x1fff07f) | imm12 | imm11 | imm10_5 | imm4_1;
+ return 0;
+}
+
+static int apply_r_riscv_jal_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u32 imm20 = (offset & 0x100000) << (31 - 20);
+ u32 imm19_12 = (offset & 0xff000);
+ u32 imm11 = (offset & 0x800) << (20 - 11);
+ u32 imm10_1 = (offset & 0x7fe) << (30 - 10);
+
+ *location = (*location & 0xfff) | imm20 | imm19_12 | imm11 | imm10_1;
+ return 0;
+}
+
+static int apply_r_riscv_rvc_branch_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u16 imm8 = (offset & 0x100) << (12 - 8);
+ u16 imm7_6 = (offset & 0xc0) >> (6 - 5);
+ u16 imm5 = (offset & 0x20) >> (5 - 2);
+ u16 imm4_3 = (offset & 0x18) << (12 - 5);
+ u16 imm2_1 = (offset & 0x6) << (12 - 10);
+
+ *(u16 *)location = (*(u16 *)location & 0xe383) |
+ imm8 | imm7_6 | imm5 | imm4_3 | imm2_1;
+ return 0;
+}
+
+static int apply_r_riscv_rvc_jump_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u16 imm11 = (offset & 0x800) << (12 - 11);
+ u16 imm10 = (offset & 0x400) >> (10 - 8);
+ u16 imm9_8 = (offset & 0x300) << (12 - 11);
+ u16 imm7 = (offset & 0x80) >> (7 - 6);
+ u16 imm6 = (offset & 0x40) << (12 - 11);
+ u16 imm5 = (offset & 0x20) >> (5 - 2);
+ u16 imm4 = (offset & 0x10) << (12 - 5);
+ u16 imm3_1 = (offset & 0xe) << (12 - 10);
+
+ *(u16 *)location = (*(u16 *)location & 0xe003) |
+ imm11 | imm10 | imm9_8 | imm7 | imm6 | imm5 | imm4 | imm3_1;
+ return 0;
+}
+
+static int apply_r_riscv_pcrel_hi20_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ s32 hi20;
+
+ if (!riscv_insn_valid_32bit_offset(offset)) {
+ pr_err(
+ "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+ me->name, (long long)v, location);
+ return -EINVAL;
+ }
+
+ hi20 = (offset + 0x800) & 0xfffff000;
+ *location = (*location & 0xfff) | hi20;
+ return 0;
+}
+
+static int apply_r_riscv_pcrel_lo12_i_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ /*
+ * v is the lo12 value to fill. It is calculated before calling this
+ * handler.
+ */
+ *location = (*location & 0xfffff) | ((v & 0xfff) << 20);
+ return 0;
+}
+
+static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ /*
+ * v is the lo12 value to fill. It is calculated before calling this
+ * handler.
+ */
+ u32 imm11_5 = (v & 0xfe0) << (31 - 11);
+ u32 imm4_0 = (v & 0x1f) << (11 - 4);
+
+ *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
+ return 0;
+}
+
+static int apply_r_riscv_hi20_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ s32 hi20;
+
+ if (IS_ENABLED(CONFIG_CMODEL_MEDLOW)) {
+ pr_err(
+ "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+ me->name, (long long)v, location);
+ return -EINVAL;
+ }
+
+ hi20 = ((s32)v + 0x800) & 0xfffff000;
+ *location = (*location & 0xfff) | hi20;
+ return 0;
+}
+
+static int apply_r_riscv_lo12_i_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ /* Skip medlow checking because of filtering by HI20 already */
+ s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
+ s32 lo12 = ((s32)v - hi20);
+ *location = (*location & 0xfffff) | ((lo12 & 0xfff) << 20);
+ return 0;
+}
+
+static int apply_r_riscv_lo12_s_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ /* Skip medlow checking because of filtering by HI20 already */
+ s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
+ s32 lo12 = ((s32)v - hi20);
+ u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11);
+ u32 imm4_0 = (lo12 & 0x1f) << (11 - 4);
+ *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
+ return 0;
+}
+
+static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ s32 hi20;
+
+ /* Always emit the got entry */
+ if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
+ offset = module_emit_got_entry(me, v);
+ offset = (void *)offset - (void *)location;
+ } else {
+ pr_err(
+ "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n",
+ me->name, (long long)v, location);
+ return -EINVAL;
+ }
+
+ hi20 = (offset + 0x800) & 0xfffff000;
+ *location = (*location & 0xfff) | hi20;
+ return 0;
+}
+
+static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u32 hi20, lo12;
+
+ if (!riscv_insn_valid_32bit_offset(offset)) {
+ /* Only emit the plt entry if offset over 32-bit range */
+ if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
+ offset = module_emit_plt_entry(me, v);
+ offset = (void *)offset - (void *)location;
+ } else {
+ pr_err(
+ "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+ me->name, (long long)v, location);
+ return -EINVAL;
+ }
+ }
+
+ hi20 = (offset + 0x800) & 0xfffff000;
+ lo12 = (offset - hi20) & 0xfff;
+ *location = (*location & 0xfff) | hi20;
+ *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
+ return 0;
+}
+
+static int apply_r_riscv_call_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ ptrdiff_t offset = (void *)v - (void *)location;
+ u32 hi20, lo12;
+
+ if (!riscv_insn_valid_32bit_offset(offset)) {
+ pr_err(
+ "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
+ me->name, (long long)v, location);
+ return -EINVAL;
+ }
+
+ hi20 = (offset + 0x800) & 0xfffff000;
+ lo12 = (offset - hi20) & 0xfff;
+ *location = (*location & 0xfff) | hi20;
+ *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
+ return 0;
+}
+
+static int apply_r_riscv_relax_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ return 0;
+}
+
+static int apply_r_riscv_align_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ pr_err(
+ "%s: The unexpected relocation type 'R_RISCV_ALIGN' from PC = %p\n",
+ me->name, location);
+ return -EINVAL;
+}
+
+static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ *(u32 *)location += (u32)v;
+ return 0;
+}
+
+static int apply_r_riscv_add64_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ *(u64 *)location += (u64)v;
+ return 0;
+}
+
+static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ *(u32 *)location -= (u32)v;
+ return 0;
+}
+
+static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
+ Elf_Addr v)
+{
+ *(u64 *)location -= (u64)v;
+ return 0;
+}
+
+static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
+ Elf_Addr v) = {
+ [R_RISCV_32] = apply_r_riscv_32_rela,
+ [R_RISCV_64] = apply_r_riscv_64_rela,
+ [R_RISCV_BRANCH] = apply_r_riscv_branch_rela,
+ [R_RISCV_JAL] = apply_r_riscv_jal_rela,
+ [R_RISCV_RVC_BRANCH] = apply_r_riscv_rvc_branch_rela,
+ [R_RISCV_RVC_JUMP] = apply_r_riscv_rvc_jump_rela,
+ [R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela,
+ [R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela,
+ [R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela,
+ [R_RISCV_HI20] = apply_r_riscv_hi20_rela,
+ [R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela,
+ [R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela,
+ [R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela,
+ [R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela,
+ [R_RISCV_CALL] = apply_r_riscv_call_rela,
+ [R_RISCV_RELAX] = apply_r_riscv_relax_rela,
+ [R_RISCV_ALIGN] = apply_r_riscv_align_rela,
+ [R_RISCV_ADD32] = apply_r_riscv_add32_rela,
+ [R_RISCV_ADD64] = apply_r_riscv_add64_rela,
+ [R_RISCV_SUB32] = apply_r_riscv_sub32_rela,
+ [R_RISCV_SUB64] = apply_r_riscv_sub64_rela,
+};
+
+int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec,
+ struct module *me)
+{
+ Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr;
+ int (*handler)(struct module *me, u32 *location, Elf_Addr v);
+ Elf_Sym *sym;
+ u32 *location;
+ unsigned int i, type;
+ Elf_Addr v;
+ int res;
+
+ pr_debug("Applying relocate section %u to %u\n", relsec,
+ sechdrs[relsec].sh_info);
+
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rel[i].r_offset;
+ /* This is the symbol it is referring to */
+ sym = (Elf_Sym *)sechdrs[symindex].sh_addr
+ + ELF_RISCV_R_SYM(rel[i].r_info);
+ if (IS_ERR_VALUE(sym->st_value)) {
+ /* Ignore unresolved weak symbol */
+ if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
+ continue;
+ pr_warn("%s: Unknown symbol %s\n",
+ me->name, strtab + sym->st_name);
+ return -ENOENT;
+ }
+
+ type = ELF_RISCV_R_TYPE(rel[i].r_info);
+
+ if (type < ARRAY_SIZE(reloc_handlers_rela))
+ handler = reloc_handlers_rela[type];
+ else
+ handler = NULL;
+
+ if (!handler) {
+ pr_err("%s: Unknown relocation type %u\n",
+ me->name, type);
+ return -EINVAL;
+ }
+
+ v = sym->st_value + rel[i].r_addend;
+
+ if (type == R_RISCV_PCREL_LO12_I || type == R_RISCV_PCREL_LO12_S) {
+ unsigned int j;
+
+ for (j = 0; j < sechdrs[relsec].sh_size / sizeof(*rel); j++) {
+ unsigned long hi20_loc =
+ sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rel[j].r_offset;
+ u32 hi20_type = ELF_RISCV_R_TYPE(rel[j].r_info);
+
+ /* Find the corresponding HI20 relocation entry */
+ if (hi20_loc == sym->st_value
+ && (hi20_type == R_RISCV_PCREL_HI20
+ || hi20_type == R_RISCV_GOT_HI20)) {
+ s32 hi20, lo12;
+ Elf_Sym *hi20_sym =
+ (Elf_Sym *)sechdrs[symindex].sh_addr
+ + ELF_RISCV_R_SYM(rel[j].r_info);
+ unsigned long hi20_sym_val =
+ hi20_sym->st_value
+ + rel[j].r_addend;
+
+ /* Calculate lo12 */
+ size_t offset = hi20_sym_val - hi20_loc;
+ if (IS_ENABLED(CONFIG_MODULE_SECTIONS)
+ && hi20_type == R_RISCV_GOT_HI20) {
+ offset = module_emit_got_entry(
+ me, hi20_sym_val);
+ offset = offset - hi20_loc;
+ }
+ hi20 = (offset + 0x800) & 0xfffff000;
+ lo12 = offset - hi20;
+ v = lo12;
+
+ break;
+ }
+ }
+ if (j == sechdrs[relsec].sh_size / sizeof(*rel)) {
+ pr_err(
+ "%s: Can not find HI20 relocation information\n",
+ me->name);
+ return -EINVAL;
+ }
+ }
+
+ res = handler(me, location, v);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
+void *module_alloc(unsigned long size)
+{
+ return __vmalloc_node_range(size, 1, MODULES_VADDR,
+ MODULES_END, GFP_KERNEL,
+ PAGE_KERNEL, VM_FLUSH_RESET_PERMS,
+ NUMA_NO_NODE,
+ __builtin_return_address(0));
+}
+#endif
+
+static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ const char *name)
+{
+ const Elf_Shdr *s, *se;
+ const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+
+ for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) {
+ if (strcmp(name, secstrs + s->sh_name) == 0)
+ return s;
+ }
+
+ return NULL;
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ const Elf_Shdr *s;
+
+ s = find_section(hdr, sechdrs, ".alternative");
+ if (s)
+ apply_module_alternatives((void *)s->sh_addr, s->sh_size);
+
+ return 0;
+}
diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
new file mode 100644
index 000000000..160e5c1ca
--- /dev/null
+++ b/arch/riscv/kernel/patch.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 SiFive
+ */
+
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/memory.h>
+#include <linux/uaccess.h>
+#include <linux/stop_machine.h>
+#include <asm/kprobes.h>
+#include <asm/cacheflush.h>
+#include <asm/fixmap.h>
+#include <asm/ftrace.h>
+#include <asm/patch.h>
+#include <asm/sections.h>
+
+struct patch_insn {
+ void *addr;
+ u32 insn;
+ atomic_t cpu_count;
+};
+
+int riscv_patch_in_stop_machine = false;
+
+#ifdef CONFIG_MMU
+
+static inline bool is_kernel_exittext(uintptr_t addr)
+{
+ return system_state < SYSTEM_RUNNING &&
+ addr >= (uintptr_t)__exittext_begin &&
+ addr < (uintptr_t)__exittext_end;
+}
+
+/*
+ * The fix_to_virt(, idx) needs a const value (not a dynamic variable of
+ * reg-a0) or BUILD_BUG_ON failed with "idx >= __end_of_fixed_addresses".
+ * So use '__always_inline' and 'const unsigned int fixmap' here.
+ */
+static __always_inline void *patch_map(void *addr, const unsigned int fixmap)
+{
+ uintptr_t uintaddr = (uintptr_t) addr;
+ struct page *page;
+
+ if (core_kernel_text(uintaddr) || is_kernel_exittext(uintaddr))
+ page = phys_to_page(__pa_symbol(addr));
+ else if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
+ page = vmalloc_to_page(addr);
+ else
+ return addr;
+
+ BUG_ON(!page);
+
+ return (void *)set_fixmap_offset(fixmap, page_to_phys(page) +
+ (uintaddr & ~PAGE_MASK));
+}
+
+static void patch_unmap(int fixmap)
+{
+ clear_fixmap(fixmap);
+}
+NOKPROBE_SYMBOL(patch_unmap);
+
+static int patch_insn_write(void *addr, const void *insn, size_t len)
+{
+ void *waddr = addr;
+ bool across_pages = (((uintptr_t) addr & ~PAGE_MASK) + len) > PAGE_SIZE;
+ int ret;
+
+ /*
+ * Before reaching here, it was expected to lock the text_mutex
+ * already, so we don't need to give another lock here and could
+ * ensure that it was safe between each cores.
+ *
+ * We're currently using stop_machine() for ftrace & kprobes, and while
+ * that ensures text_mutex is held before installing the mappings it
+ * does not ensure text_mutex is held by the calling thread. That's
+ * safe but triggers a lockdep failure, so just elide it for that
+ * specific case.
+ */
+ if (!riscv_patch_in_stop_machine)
+ lockdep_assert_held(&text_mutex);
+
+ if (across_pages)
+ patch_map(addr + len, FIX_TEXT_POKE1);
+
+ waddr = patch_map(addr, FIX_TEXT_POKE0);
+
+ ret = copy_to_kernel_nofault(waddr, insn, len);
+
+ patch_unmap(FIX_TEXT_POKE0);
+
+ if (across_pages)
+ patch_unmap(FIX_TEXT_POKE1);
+
+ return ret;
+}
+NOKPROBE_SYMBOL(patch_insn_write);
+#else
+static int patch_insn_write(void *addr, const void *insn, size_t len)
+{
+ return copy_to_kernel_nofault(addr, insn, len);
+}
+NOKPROBE_SYMBOL(patch_insn_write);
+#endif /* CONFIG_MMU */
+
+int patch_text_nosync(void *addr, const void *insns, size_t len)
+{
+ u32 *tp = addr;
+ int ret;
+
+ ret = patch_insn_write(tp, insns, len);
+
+ if (!ret)
+ flush_icache_range((uintptr_t) tp, (uintptr_t) tp + len);
+
+ return ret;
+}
+NOKPROBE_SYMBOL(patch_text_nosync);
+
+static int patch_text_cb(void *data)
+{
+ struct patch_insn *patch = data;
+ int ret = 0;
+
+ if (atomic_inc_return(&patch->cpu_count) == num_online_cpus()) {
+ ret =
+ patch_text_nosync(patch->addr, &patch->insn,
+ GET_INSN_LENGTH(patch->insn));
+ atomic_inc(&patch->cpu_count);
+ } else {
+ while (atomic_read(&patch->cpu_count) <= num_online_cpus())
+ cpu_relax();
+ smp_mb();
+ }
+
+ return ret;
+}
+NOKPROBE_SYMBOL(patch_text_cb);
+
+int patch_text(void *addr, u32 insn)
+{
+ int ret;
+ struct patch_insn patch = {
+ .addr = addr,
+ .insn = insn,
+ .cpu_count = ATOMIC_INIT(0),
+ };
+
+ /*
+ * kprobes takes text_mutex, before calling patch_text(), but as we call
+ * calls stop_machine(), the lockdep assertion in patch_insn_write()
+ * gets confused by the context in which the lock is taken.
+ * Instead, ensure the lock is held before calling stop_machine(), and
+ * set riscv_patch_in_stop_machine to skip the check in
+ * patch_insn_write().
+ */
+ lockdep_assert_held(&text_mutex);
+ riscv_patch_in_stop_machine = true;
+ ret = stop_machine_cpuslocked(patch_text_cb, &patch, cpu_online_mask);
+ riscv_patch_in_stop_machine = false;
+ return ret;
+}
+NOKPROBE_SYMBOL(patch_text);
diff --git a/arch/riscv/kernel/perf_callchain.c b/arch/riscv/kernel/perf_callchain.c
new file mode 100644
index 000000000..3348a61de
--- /dev/null
+++ b/arch/riscv/kernel/perf_callchain.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
+
+#include <linux/perf_event.h>
+#include <linux/uaccess.h>
+
+#include <asm/stacktrace.h>
+
+/*
+ * Get the return address for a single stackframe and return a pointer to the
+ * next frame tail.
+ */
+static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
+ unsigned long fp, unsigned long reg_ra)
+{
+ struct stackframe buftail;
+ unsigned long ra = 0;
+ unsigned long __user *user_frame_tail =
+ (unsigned long __user *)(fp - sizeof(struct stackframe));
+
+ /* Check accessibility of one struct frame_tail beyond */
+ if (!access_ok(user_frame_tail, sizeof(buftail)))
+ return 0;
+ if (__copy_from_user_inatomic(&buftail, user_frame_tail,
+ sizeof(buftail)))
+ return 0;
+
+ if (reg_ra != 0)
+ ra = reg_ra;
+ else
+ ra = buftail.ra;
+
+ fp = buftail.fp;
+ if (ra != 0)
+ perf_callchain_store(entry, ra);
+ else
+ return 0;
+
+ return fp;
+}
+
+/*
+ * This will be called when the target is in user mode
+ * This function will only be called when we use
+ * "PERF_SAMPLE_CALLCHAIN" in
+ * kernel/events/core.c:perf_prepare_sample()
+ *
+ * How to trigger perf_callchain_[user/kernel] :
+ * $ perf record -e cpu-clock --call-graph fp ./program
+ * $ perf report --call-graph
+ *
+ * On RISC-V platform, the program being sampled and the C library
+ * need to be compiled with -fno-omit-frame-pointer, otherwise
+ * the user stack will not contain function frame.
+ */
+void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
+ struct pt_regs *regs)
+{
+ unsigned long fp = 0;
+
+ fp = regs->s0;
+ perf_callchain_store(entry, regs->epc);
+
+ fp = user_backtrace(entry, fp, regs->ra);
+ while (fp && !(fp & 0x3) && entry->nr < entry->max_stack)
+ fp = user_backtrace(entry, fp, 0);
+}
+
+static bool fill_callchain(void *entry, unsigned long pc)
+{
+ return perf_callchain_store(entry, pc) == 0;
+}
+
+void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
+ struct pt_regs *regs)
+{
+ walk_stackframe(NULL, regs, fill_callchain, entry);
+}
diff --git a/arch/riscv/kernel/perf_regs.c b/arch/riscv/kernel/perf_regs.c
new file mode 100644
index 000000000..fd304a248
--- /dev/null
+++ b/arch/riscv/kernel/perf_regs.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/perf_event.h>
+#include <linux/bug.h>
+#include <asm/perf_regs.h>
+#include <asm/ptrace.h>
+
+u64 perf_reg_value(struct pt_regs *regs, int idx)
+{
+ if (WARN_ON_ONCE((u32)idx >= PERF_REG_RISCV_MAX))
+ return 0;
+
+ return ((unsigned long *)regs)[idx];
+}
+
+#define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1))
+
+int perf_reg_validate(u64 mask)
+{
+ if (!mask || mask & REG_RESERVED)
+ return -EINVAL;
+
+ return 0;
+}
+
+u64 perf_reg_abi(struct task_struct *task)
+{
+#if __riscv_xlen == 64
+ return PERF_SAMPLE_REGS_ABI_64;
+#else
+ return PERF_SAMPLE_REGS_ABI_32;
+#endif
+}
+
+void perf_get_regs_user(struct perf_regs *regs_user,
+ struct pt_regs *regs)
+{
+ regs_user->regs = task_pt_regs(current);
+ regs_user->abi = perf_reg_abi(current);
+}
diff --git a/arch/riscv/kernel/probes/Makefile b/arch/riscv/kernel/probes/Makefile
new file mode 100644
index 000000000..90dea3abd
--- /dev/null
+++ b/arch/riscv/kernel/probes/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_KPROBES) += kprobes.o decode-insn.o simulate-insn.o
+obj-$(CONFIG_KPROBES) += kprobes_trampoline.o
+obj-$(CONFIG_KPROBES_ON_FTRACE) += ftrace.o
+obj-$(CONFIG_UPROBES) += uprobes.o decode-insn.o simulate-insn.o
+CFLAGS_REMOVE_simulate-insn.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook.o = $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_rethook_trampoline.o = $(CC_FLAGS_FTRACE)
diff --git a/arch/riscv/kernel/probes/decode-insn.c b/arch/riscv/kernel/probes/decode-insn.c
new file mode 100644
index 000000000..64f6183b4
--- /dev/null
+++ b/arch/riscv/kernel/probes/decode-insn.c
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <asm/sections.h>
+
+#include "decode-insn.h"
+#include "simulate-insn.h"
+
+/* Return:
+ * INSN_REJECTED If instruction is one not allowed to kprobe,
+ * INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
+ */
+enum probe_insn __kprobes
+riscv_probe_decode_insn(probe_opcode_t *addr, struct arch_probe_insn *api)
+{
+ probe_opcode_t insn = *addr;
+
+ /*
+ * Reject instructions list:
+ */
+ RISCV_INSN_REJECTED(system, insn);
+ RISCV_INSN_REJECTED(fence, insn);
+
+ /*
+ * Simulate instructions list:
+ * TODO: the REJECTED ones below need to be implemented
+ */
+#ifdef CONFIG_RISCV_ISA_C
+ RISCV_INSN_REJECTED(c_j, insn);
+ RISCV_INSN_REJECTED(c_jr, insn);
+ RISCV_INSN_REJECTED(c_jal, insn);
+ RISCV_INSN_REJECTED(c_jalr, insn);
+ RISCV_INSN_REJECTED(c_beqz, insn);
+ RISCV_INSN_REJECTED(c_bnez, insn);
+ RISCV_INSN_REJECTED(c_ebreak, insn);
+#endif
+
+ RISCV_INSN_SET_SIMULATE(jal, insn);
+ RISCV_INSN_SET_SIMULATE(jalr, insn);
+ RISCV_INSN_SET_SIMULATE(auipc, insn);
+ RISCV_INSN_SET_SIMULATE(branch, insn);
+
+ return INSN_GOOD;
+}
diff --git a/arch/riscv/kernel/probes/decode-insn.h b/arch/riscv/kernel/probes/decode-insn.h
new file mode 100644
index 000000000..42269a7d6
--- /dev/null
+++ b/arch/riscv/kernel/probes/decode-insn.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _RISCV_KERNEL_KPROBES_DECODE_INSN_H
+#define _RISCV_KERNEL_KPROBES_DECODE_INSN_H
+
+#include <asm/sections.h>
+#include <asm/kprobes.h>
+
+enum probe_insn {
+ INSN_REJECTED,
+ INSN_GOOD_NO_SLOT,
+ INSN_GOOD,
+};
+
+enum probe_insn __kprobes
+riscv_probe_decode_insn(probe_opcode_t *addr, struct arch_probe_insn *asi);
+
+#endif /* _RISCV_KERNEL_KPROBES_DECODE_INSN_H */
diff --git a/arch/riscv/kernel/probes/ftrace.c b/arch/riscv/kernel/probes/ftrace.c
new file mode 100644
index 000000000..7142ec42e
--- /dev/null
+++ b/arch/riscv/kernel/probes/ftrace.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kprobes.h>
+
+/* Ftrace callback handler for kprobes -- called under preepmt disabled */
+void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *ops, struct ftrace_regs *fregs)
+{
+ struct kprobe *p;
+ struct pt_regs *regs;
+ struct kprobe_ctlblk *kcb;
+ int bit;
+
+ bit = ftrace_test_recursion_trylock(ip, parent_ip);
+ if (bit < 0)
+ return;
+
+ p = get_kprobe((kprobe_opcode_t *)ip);
+ if (unlikely(!p) || kprobe_disabled(p))
+ goto out;
+
+ regs = ftrace_get_regs(fregs);
+ kcb = get_kprobe_ctlblk();
+ if (kprobe_running()) {
+ kprobes_inc_nmissed_count(p);
+ } else {
+ unsigned long orig_ip = instruction_pointer(regs);
+
+ instruction_pointer_set(regs, ip);
+
+ __this_cpu_write(current_kprobe, p);
+ kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+ if (!p->pre_handler || !p->pre_handler(p, regs)) {
+ /*
+ * Emulate singlestep (and also recover regs->pc)
+ * as if there is a nop
+ */
+ instruction_pointer_set(regs,
+ (unsigned long)p->addr + MCOUNT_INSN_SIZE);
+ if (unlikely(p->post_handler)) {
+ kcb->kprobe_status = KPROBE_HIT_SSDONE;
+ p->post_handler(p, regs, 0);
+ }
+ instruction_pointer_set(regs, orig_ip);
+ }
+
+ /*
+ * If pre_handler returns !0, it changes regs->pc. We have to
+ * skip emulating post_handler.
+ */
+ __this_cpu_write(current_kprobe, NULL);
+ }
+out:
+ ftrace_test_recursion_unlock(bit);
+}
+NOKPROBE_SYMBOL(kprobe_ftrace_handler);
+
+int arch_prepare_kprobe_ftrace(struct kprobe *p)
+{
+ p->ainsn.api.insn = NULL;
+ return 0;
+}
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
new file mode 100644
index 000000000..cca2b3a21
--- /dev/null
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -0,0 +1,389 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#define pr_fmt(fmt) "kprobes: " fmt
+
+#include <linux/kprobes.h>
+#include <linux/extable.h>
+#include <linux/slab.h>
+#include <linux/stop_machine.h>
+#include <asm/ptrace.h>
+#include <linux/uaccess.h>
+#include <asm/sections.h>
+#include <asm/cacheflush.h>
+#include <asm/bug.h>
+#include <asm/patch.h>
+
+#include "decode-insn.h"
+
+DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
+DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
+static void __kprobes
+post_kprobe_handler(struct kprobe *, struct kprobe_ctlblk *, struct pt_regs *);
+
+static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
+{
+ unsigned long offset = GET_INSN_LENGTH(p->opcode);
+
+ p->ainsn.api.restore = (unsigned long)p->addr + offset;
+
+ patch_text(p->ainsn.api.insn, p->opcode);
+ patch_text((void *)((unsigned long)(p->ainsn.api.insn) + offset),
+ __BUG_INSN_32);
+}
+
+static void __kprobes arch_prepare_simulate(struct kprobe *p)
+{
+ p->ainsn.api.restore = 0;
+}
+
+static void __kprobes arch_simulate_insn(struct kprobe *p, struct pt_regs *regs)
+{
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+ if (p->ainsn.api.handler)
+ p->ainsn.api.handler((u32)p->opcode,
+ (unsigned long)p->addr, regs);
+
+ post_kprobe_handler(p, kcb, regs);
+}
+
+static bool __kprobes arch_check_kprobe(struct kprobe *p)
+{
+ unsigned long tmp = (unsigned long)p->addr - p->offset;
+ unsigned long addr = (unsigned long)p->addr;
+
+ while (tmp <= addr) {
+ if (tmp == addr)
+ return true;
+
+ tmp += GET_INSN_LENGTH(*(u16 *)tmp);
+ }
+
+ return false;
+}
+
+int __kprobes arch_prepare_kprobe(struct kprobe *p)
+{
+ u16 *insn = (u16 *)p->addr;
+
+ if ((unsigned long)insn & 0x1)
+ return -EILSEQ;
+
+ if (!arch_check_kprobe(p))
+ return -EILSEQ;
+
+ /* copy instruction */
+ p->opcode = (kprobe_opcode_t)(*insn++);
+ if (GET_INSN_LENGTH(p->opcode) == 4)
+ p->opcode |= (kprobe_opcode_t)(*insn) << 16;
+
+ /* decode instruction */
+ switch (riscv_probe_decode_insn(p->addr, &p->ainsn.api)) {
+ case INSN_REJECTED: /* insn not supported */
+ return -EINVAL;
+
+ case INSN_GOOD_NO_SLOT: /* insn need simulation */
+ p->ainsn.api.insn = NULL;
+ break;
+
+ case INSN_GOOD: /* instruction uses slot */
+ p->ainsn.api.insn = get_insn_slot();
+ if (!p->ainsn.api.insn)
+ return -ENOMEM;
+ break;
+ }
+
+ /* prepare the instruction */
+ if (p->ainsn.api.insn)
+ arch_prepare_ss_slot(p);
+ else
+ arch_prepare_simulate(p);
+
+ return 0;
+}
+
+#ifdef CONFIG_MMU
+void *alloc_insn_page(void)
+{
+ return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
+ GFP_KERNEL, PAGE_KERNEL_READ_EXEC,
+ VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
+ __builtin_return_address(0));
+}
+#endif
+
+/* install breakpoint in text */
+void __kprobes arch_arm_kprobe(struct kprobe *p)
+{
+ if ((p->opcode & __INSN_LENGTH_MASK) == __INSN_LENGTH_32)
+ patch_text(p->addr, __BUG_INSN_32);
+ else
+ patch_text(p->addr, __BUG_INSN_16);
+}
+
+/* remove breakpoint from text */
+void __kprobes arch_disarm_kprobe(struct kprobe *p)
+{
+ patch_text(p->addr, p->opcode);
+}
+
+void __kprobes arch_remove_kprobe(struct kprobe *p)
+{
+}
+
+static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+ kcb->prev_kprobe.kp = kprobe_running();
+ kcb->prev_kprobe.status = kcb->kprobe_status;
+}
+
+static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
+{
+ __this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
+ kcb->kprobe_status = kcb->prev_kprobe.status;
+}
+
+static void __kprobes set_current_kprobe(struct kprobe *p)
+{
+ __this_cpu_write(current_kprobe, p);
+}
+
+/*
+ * Interrupts need to be disabled before single-step mode is set, and not
+ * reenabled until after single-step mode ends.
+ * Without disabling interrupt on local CPU, there is a chance of
+ * interrupt occurrence in the period of exception return and start of
+ * out-of-line single-step, that result in wrongly single stepping
+ * into the interrupt handler.
+ */
+static void __kprobes kprobes_save_local_irqflag(struct kprobe_ctlblk *kcb,
+ struct pt_regs *regs)
+{
+ kcb->saved_status = regs->status;
+ regs->status &= ~SR_SPIE;
+}
+
+static void __kprobes kprobes_restore_local_irqflag(struct kprobe_ctlblk *kcb,
+ struct pt_regs *regs)
+{
+ regs->status = kcb->saved_status;
+}
+
+static void __kprobes setup_singlestep(struct kprobe *p,
+ struct pt_regs *regs,
+ struct kprobe_ctlblk *kcb, int reenter)
+{
+ unsigned long slot;
+
+ if (reenter) {
+ save_previous_kprobe(kcb);
+ set_current_kprobe(p);
+ kcb->kprobe_status = KPROBE_REENTER;
+ } else {
+ kcb->kprobe_status = KPROBE_HIT_SS;
+ }
+
+ if (p->ainsn.api.insn) {
+ /* prepare for single stepping */
+ slot = (unsigned long)p->ainsn.api.insn;
+
+ /* IRQs and single stepping do not mix well. */
+ kprobes_save_local_irqflag(kcb, regs);
+
+ instruction_pointer_set(regs, slot);
+ } else {
+ /* insn simulation */
+ arch_simulate_insn(p, regs);
+ }
+}
+
+static int __kprobes reenter_kprobe(struct kprobe *p,
+ struct pt_regs *regs,
+ struct kprobe_ctlblk *kcb)
+{
+ switch (kcb->kprobe_status) {
+ case KPROBE_HIT_SSDONE:
+ case KPROBE_HIT_ACTIVE:
+ kprobes_inc_nmissed_count(p);
+ setup_singlestep(p, regs, kcb, 1);
+ break;
+ case KPROBE_HIT_SS:
+ case KPROBE_REENTER:
+ pr_warn("Failed to recover from reentered kprobes.\n");
+ dump_kprobe(p);
+ BUG();
+ break;
+ default:
+ WARN_ON(1);
+ return 0;
+ }
+
+ return 1;
+}
+
+static void __kprobes
+post_kprobe_handler(struct kprobe *cur, struct kprobe_ctlblk *kcb, struct pt_regs *regs)
+{
+ /* return addr restore if non-branching insn */
+ if (cur->ainsn.api.restore != 0)
+ regs->epc = cur->ainsn.api.restore;
+
+ /* restore back original saved kprobe variables and continue */
+ if (kcb->kprobe_status == KPROBE_REENTER) {
+ restore_previous_kprobe(kcb);
+ return;
+ }
+
+ /* call post handler */
+ kcb->kprobe_status = KPROBE_HIT_SSDONE;
+ if (cur->post_handler) {
+ /* post_handler can hit breakpoint and single step
+ * again, so we enable D-flag for recursive exception.
+ */
+ cur->post_handler(cur, regs, 0);
+ }
+
+ reset_current_kprobe();
+}
+
+int __kprobes kprobe_fault_handler(struct pt_regs *regs, unsigned int trapnr)
+{
+ struct kprobe *cur = kprobe_running();
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+
+ switch (kcb->kprobe_status) {
+ case KPROBE_HIT_SS:
+ case KPROBE_REENTER:
+ /*
+ * We are here because the instruction being single
+ * stepped caused a page fault. We reset the current
+ * kprobe and the ip points back to the probe address
+ * and allow the page fault handler to continue as a
+ * normal page fault.
+ */
+ regs->epc = (unsigned long) cur->addr;
+ BUG_ON(!instruction_pointer(regs));
+
+ if (kcb->kprobe_status == KPROBE_REENTER)
+ restore_previous_kprobe(kcb);
+ else {
+ kprobes_restore_local_irqflag(kcb, regs);
+ reset_current_kprobe();
+ }
+
+ break;
+ case KPROBE_HIT_ACTIVE:
+ case KPROBE_HIT_SSDONE:
+ /*
+ * In case the user-specified fault handler returned
+ * zero, try to fix up.
+ */
+ if (fixup_exception(regs))
+ return 1;
+ }
+ return 0;
+}
+
+bool __kprobes
+kprobe_breakpoint_handler(struct pt_regs *regs)
+{
+ struct kprobe *p, *cur_kprobe;
+ struct kprobe_ctlblk *kcb;
+ unsigned long addr = instruction_pointer(regs);
+
+ kcb = get_kprobe_ctlblk();
+ cur_kprobe = kprobe_running();
+
+ p = get_kprobe((kprobe_opcode_t *) addr);
+
+ if (p) {
+ if (cur_kprobe) {
+ if (reenter_kprobe(p, regs, kcb))
+ return true;
+ } else {
+ /* Probe hit */
+ set_current_kprobe(p);
+ kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+ /*
+ * If we have no pre-handler or it returned 0, we
+ * continue with normal processing. If we have a
+ * pre-handler and it returned non-zero, it will
+ * modify the execution path and no need to single
+ * stepping. Let's just reset current kprobe and exit.
+ *
+ * pre_handler can hit a breakpoint and can step thru
+ * before return.
+ */
+ if (!p->pre_handler || !p->pre_handler(p, regs))
+ setup_singlestep(p, regs, kcb, 0);
+ else
+ reset_current_kprobe();
+ }
+ return true;
+ }
+
+ /*
+ * The breakpoint instruction was removed right
+ * after we hit it. Another cpu has removed
+ * either a probepoint or a debugger breakpoint
+ * at this address. In either case, no further
+ * handling of this interrupt is appropriate.
+ * Return back to original instruction, and continue.
+ */
+ return false;
+}
+
+bool __kprobes
+kprobe_single_step_handler(struct pt_regs *regs)
+{
+ struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
+ unsigned long addr = instruction_pointer(regs);
+ struct kprobe *cur = kprobe_running();
+
+ if (cur && (kcb->kprobe_status & (KPROBE_HIT_SS | KPROBE_REENTER)) &&
+ ((unsigned long)&cur->ainsn.api.insn[0] + GET_INSN_LENGTH(cur->opcode) == addr)) {
+ kprobes_restore_local_irqflag(kcb, regs);
+ post_kprobe_handler(cur, kcb, regs);
+ return true;
+ }
+ /* not ours, kprobes should ignore it */
+ return false;
+}
+
+/*
+ * Provide a blacklist of symbols identifying ranges which cannot be kprobed.
+ * This blacklist is exposed to userspace via debugfs (kprobes/blacklist).
+ */
+int __init arch_populate_kprobe_blacklist(void)
+{
+ int ret;
+
+ ret = kprobe_add_area_blacklist((unsigned long)__irqentry_text_start,
+ (unsigned long)__irqentry_text_end);
+ return ret;
+}
+
+void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
+{
+ return (void *)kretprobe_trampoline_handler(regs, NULL);
+}
+
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
+ struct pt_regs *regs)
+{
+ ri->ret_addr = (kprobe_opcode_t *)regs->ra;
+ ri->fp = NULL;
+ regs->ra = (unsigned long) &__kretprobe_trampoline;
+}
+
+int __kprobes arch_trampoline_kprobe(struct kprobe *p)
+{
+ return 0;
+}
+
+int __init arch_init_kprobes(void)
+{
+ return 0;
+}
diff --git a/arch/riscv/kernel/probes/kprobes_trampoline.S b/arch/riscv/kernel/probes/kprobes_trampoline.S
new file mode 100644
index 000000000..7bdb09ded
--- /dev/null
+++ b/arch/riscv/kernel/probes/kprobes_trampoline.S
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Author: Patrick Stählin <me@packi.ch>
+ */
+#include <linux/linkage.h>
+
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+
+ .text
+ .altmacro
+
+ .macro save_all_base_regs
+ REG_S x1, PT_RA(sp)
+ REG_S x3, PT_GP(sp)
+ REG_S x4, PT_TP(sp)
+ REG_S x5, PT_T0(sp)
+ REG_S x6, PT_T1(sp)
+ REG_S x7, PT_T2(sp)
+ REG_S x8, PT_S0(sp)
+ REG_S x9, PT_S1(sp)
+ REG_S x10, PT_A0(sp)
+ REG_S x11, PT_A1(sp)
+ REG_S x12, PT_A2(sp)
+ REG_S x13, PT_A3(sp)
+ REG_S x14, PT_A4(sp)
+ REG_S x15, PT_A5(sp)
+ REG_S x16, PT_A6(sp)
+ REG_S x17, PT_A7(sp)
+ REG_S x18, PT_S2(sp)
+ REG_S x19, PT_S3(sp)
+ REG_S x20, PT_S4(sp)
+ REG_S x21, PT_S5(sp)
+ REG_S x22, PT_S6(sp)
+ REG_S x23, PT_S7(sp)
+ REG_S x24, PT_S8(sp)
+ REG_S x25, PT_S9(sp)
+ REG_S x26, PT_S10(sp)
+ REG_S x27, PT_S11(sp)
+ REG_S x28, PT_T3(sp)
+ REG_S x29, PT_T4(sp)
+ REG_S x30, PT_T5(sp)
+ REG_S x31, PT_T6(sp)
+ .endm
+
+ .macro restore_all_base_regs
+ REG_L x3, PT_GP(sp)
+ REG_L x4, PT_TP(sp)
+ REG_L x5, PT_T0(sp)
+ REG_L x6, PT_T1(sp)
+ REG_L x7, PT_T2(sp)
+ REG_L x8, PT_S0(sp)
+ REG_L x9, PT_S1(sp)
+ REG_L x10, PT_A0(sp)
+ REG_L x11, PT_A1(sp)
+ REG_L x12, PT_A2(sp)
+ REG_L x13, PT_A3(sp)
+ REG_L x14, PT_A4(sp)
+ REG_L x15, PT_A5(sp)
+ REG_L x16, PT_A6(sp)
+ REG_L x17, PT_A7(sp)
+ REG_L x18, PT_S2(sp)
+ REG_L x19, PT_S3(sp)
+ REG_L x20, PT_S4(sp)
+ REG_L x21, PT_S5(sp)
+ REG_L x22, PT_S6(sp)
+ REG_L x23, PT_S7(sp)
+ REG_L x24, PT_S8(sp)
+ REG_L x25, PT_S9(sp)
+ REG_L x26, PT_S10(sp)
+ REG_L x27, PT_S11(sp)
+ REG_L x28, PT_T3(sp)
+ REG_L x29, PT_T4(sp)
+ REG_L x30, PT_T5(sp)
+ REG_L x31, PT_T6(sp)
+ .endm
+
+ENTRY(__kretprobe_trampoline)
+ addi sp, sp, -(PT_SIZE_ON_STACK)
+ save_all_base_regs
+
+ move a0, sp /* pt_regs */
+
+ call trampoline_probe_handler
+
+ /* use the result as the return-address */
+ move ra, a0
+
+ restore_all_base_regs
+ addi sp, sp, PT_SIZE_ON_STACK
+
+ ret
+ENDPROC(__kretprobe_trampoline)
diff --git a/arch/riscv/kernel/probes/simulate-insn.c b/arch/riscv/kernel/probes/simulate-insn.c
new file mode 100644
index 000000000..41bf1eb01
--- /dev/null
+++ b/arch/riscv/kernel/probes/simulate-insn.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+
+#include "decode-insn.h"
+#include "simulate-insn.h"
+
+static inline bool rv_insn_reg_get_val(struct pt_regs *regs, u32 index,
+ unsigned long *ptr)
+{
+ if (index == 0)
+ *ptr = 0;
+ else if (index <= 31)
+ *ptr = *((unsigned long *)regs + index);
+ else
+ return false;
+
+ return true;
+}
+
+static inline bool rv_insn_reg_set_val(struct pt_regs *regs, u32 index,
+ unsigned long val)
+{
+ if (index == 0)
+ return true;
+ else if (index <= 31)
+ *((unsigned long *)regs + index) = val;
+ else
+ return false;
+
+ return true;
+}
+
+bool __kprobes simulate_jal(u32 opcode, unsigned long addr, struct pt_regs *regs)
+{
+ /*
+ * 31 30 21 20 19 12 11 7 6 0
+ * imm [20] | imm[10:1] | imm[11] | imm[19:12] | rd | opcode
+ * 1 10 1 8 5 JAL/J
+ */
+ bool ret;
+ u32 imm;
+ u32 index = (opcode >> 7) & 0x1f;
+
+ ret = rv_insn_reg_set_val(regs, index, addr + 4);
+ if (!ret)
+ return ret;
+
+ imm = ((opcode >> 21) & 0x3ff) << 1;
+ imm |= ((opcode >> 20) & 0x1) << 11;
+ imm |= ((opcode >> 12) & 0xff) << 12;
+ imm |= ((opcode >> 31) & 0x1) << 20;
+
+ instruction_pointer_set(regs, addr + sign_extend32((imm), 20));
+
+ return ret;
+}
+
+bool __kprobes simulate_jalr(u32 opcode, unsigned long addr, struct pt_regs *regs)
+{
+ /*
+ * 31 20 19 15 14 12 11 7 6 0
+ * offset[11:0] | rs1 | 010 | rd | opcode
+ * 12 5 3 5 JALR/JR
+ */
+ bool ret;
+ unsigned long base_addr;
+ u32 imm = (opcode >> 20) & 0xfff;
+ u32 rd_index = (opcode >> 7) & 0x1f;
+ u32 rs1_index = (opcode >> 15) & 0x1f;
+
+ ret = rv_insn_reg_get_val(regs, rs1_index, &base_addr);
+ if (!ret)
+ return ret;
+
+ ret = rv_insn_reg_set_val(regs, rd_index, addr + 4);
+ if (!ret)
+ return ret;
+
+ instruction_pointer_set(regs, (base_addr + sign_extend32((imm), 11))&~1);
+
+ return ret;
+}
+
+#define auipc_rd_idx(opcode) \
+ ((opcode >> 7) & 0x1f)
+
+#define auipc_imm(opcode) \
+ ((((opcode) >> 12) & 0xfffff) << 12)
+
+#if __riscv_xlen == 64
+#define auipc_offset(opcode) sign_extend64(auipc_imm(opcode), 31)
+#elif __riscv_xlen == 32
+#define auipc_offset(opcode) auipc_imm(opcode)
+#else
+#error "Unexpected __riscv_xlen"
+#endif
+
+bool __kprobes simulate_auipc(u32 opcode, unsigned long addr, struct pt_regs *regs)
+{
+ /*
+ * auipc instruction:
+ * 31 12 11 7 6 0
+ * | imm[31:12] | rd | opcode |
+ * 20 5 7
+ */
+
+ u32 rd_idx = auipc_rd_idx(opcode);
+ unsigned long rd_val = addr + auipc_offset(opcode);
+
+ if (!rv_insn_reg_set_val(regs, rd_idx, rd_val))
+ return false;
+
+ instruction_pointer_set(regs, addr + 4);
+
+ return true;
+}
+
+#define branch_rs1_idx(opcode) \
+ (((opcode) >> 15) & 0x1f)
+
+#define branch_rs2_idx(opcode) \
+ (((opcode) >> 20) & 0x1f)
+
+#define branch_funct3(opcode) \
+ (((opcode) >> 12) & 0x7)
+
+#define branch_imm(opcode) \
+ (((((opcode) >> 8) & 0xf ) << 1) | \
+ ((((opcode) >> 25) & 0x3f) << 5) | \
+ ((((opcode) >> 7) & 0x1 ) << 11) | \
+ ((((opcode) >> 31) & 0x1 ) << 12))
+
+#define branch_offset(opcode) \
+ sign_extend32((branch_imm(opcode)), 12)
+
+#define BRANCH_BEQ 0x0
+#define BRANCH_BNE 0x1
+#define BRANCH_BLT 0x4
+#define BRANCH_BGE 0x5
+#define BRANCH_BLTU 0x6
+#define BRANCH_BGEU 0x7
+
+bool __kprobes simulate_branch(u32 opcode, unsigned long addr, struct pt_regs *regs)
+{
+ /*
+ * branch instructions:
+ * 31 30 25 24 20 19 15 14 12 11 8 7 6 0
+ * | imm[12] | imm[10:5] | rs2 | rs1 | funct3 | imm[4:1] | imm[11] | opcode |
+ * 1 6 5 5 3 4 1 7
+ * imm[12|10:5] rs2 rs1 000 imm[4:1|11] 1100011 BEQ
+ * imm[12|10:5] rs2 rs1 001 imm[4:1|11] 1100011 BNE
+ * imm[12|10:5] rs2 rs1 100 imm[4:1|11] 1100011 BLT
+ * imm[12|10:5] rs2 rs1 101 imm[4:1|11] 1100011 BGE
+ * imm[12|10:5] rs2 rs1 110 imm[4:1|11] 1100011 BLTU
+ * imm[12|10:5] rs2 rs1 111 imm[4:1|11] 1100011 BGEU
+ */
+
+ s32 offset;
+ s32 offset_tmp;
+ unsigned long rs1_val;
+ unsigned long rs2_val;
+
+ if (!rv_insn_reg_get_val(regs, branch_rs1_idx(opcode), &rs1_val) ||
+ !rv_insn_reg_get_val(regs, branch_rs2_idx(opcode), &rs2_val))
+ return false;
+
+ offset_tmp = branch_offset(opcode);
+ switch (branch_funct3(opcode)) {
+ case BRANCH_BEQ:
+ offset = (rs1_val == rs2_val) ? offset_tmp : 4;
+ break;
+ case BRANCH_BNE:
+ offset = (rs1_val != rs2_val) ? offset_tmp : 4;
+ break;
+ case BRANCH_BLT:
+ offset = ((long)rs1_val < (long)rs2_val) ? offset_tmp : 4;
+ break;
+ case BRANCH_BGE:
+ offset = ((long)rs1_val >= (long)rs2_val) ? offset_tmp : 4;
+ break;
+ case BRANCH_BLTU:
+ offset = (rs1_val < rs2_val) ? offset_tmp : 4;
+ break;
+ case BRANCH_BGEU:
+ offset = (rs1_val >= rs2_val) ? offset_tmp : 4;
+ break;
+ default:
+ return false;
+ }
+
+ instruction_pointer_set(regs, addr + offset);
+
+ return true;
+}
diff --git a/arch/riscv/kernel/probes/simulate-insn.h b/arch/riscv/kernel/probes/simulate-insn.h
new file mode 100644
index 000000000..de8474146
--- /dev/null
+++ b/arch/riscv/kernel/probes/simulate-insn.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef _RISCV_KERNEL_PROBES_SIMULATE_INSN_H
+#define _RISCV_KERNEL_PROBES_SIMULATE_INSN_H
+
+#define __RISCV_INSN_FUNCS(name, mask, val) \
+static __always_inline bool riscv_insn_is_##name(probe_opcode_t code) \
+{ \
+ BUILD_BUG_ON(~(mask) & (val)); \
+ return (code & (mask)) == (val); \
+} \
+bool simulate_##name(u32 opcode, unsigned long addr, \
+ struct pt_regs *regs)
+
+#define RISCV_INSN_REJECTED(name, code) \
+ do { \
+ if (riscv_insn_is_##name(code)) { \
+ return INSN_REJECTED; \
+ } \
+ } while (0)
+
+__RISCV_INSN_FUNCS(system, 0x7f, 0x73);
+__RISCV_INSN_FUNCS(fence, 0x7f, 0x0f);
+
+#define RISCV_INSN_SET_SIMULATE(name, code) \
+ do { \
+ if (riscv_insn_is_##name(code)) { \
+ api->handler = simulate_##name; \
+ return INSN_GOOD_NO_SLOT; \
+ } \
+ } while (0)
+
+__RISCV_INSN_FUNCS(c_j, 0xe003, 0xa001);
+__RISCV_INSN_FUNCS(c_jr, 0xf07f, 0x8002);
+__RISCV_INSN_FUNCS(c_jal, 0xe003, 0x2001);
+__RISCV_INSN_FUNCS(c_jalr, 0xf07f, 0x9002);
+__RISCV_INSN_FUNCS(c_beqz, 0xe003, 0xc001);
+__RISCV_INSN_FUNCS(c_bnez, 0xe003, 0xe001);
+__RISCV_INSN_FUNCS(c_ebreak, 0xffff, 0x9002);
+
+__RISCV_INSN_FUNCS(auipc, 0x7f, 0x17);
+__RISCV_INSN_FUNCS(branch, 0x7f, 0x63);
+
+__RISCV_INSN_FUNCS(jal, 0x7f, 0x6f);
+__RISCV_INSN_FUNCS(jalr, 0x707f, 0x67);
+
+#endif /* _RISCV_KERNEL_PROBES_SIMULATE_INSN_H */
diff --git a/arch/riscv/kernel/probes/uprobes.c b/arch/riscv/kernel/probes/uprobes.c
new file mode 100644
index 000000000..194f166b2
--- /dev/null
+++ b/arch/riscv/kernel/probes/uprobes.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/highmem.h>
+#include <linux/ptrace.h>
+#include <linux/uprobes.h>
+
+#include "decode-insn.h"
+
+#define UPROBE_TRAP_NR UINT_MAX
+
+bool is_swbp_insn(uprobe_opcode_t *insn)
+{
+#ifdef CONFIG_RISCV_ISA_C
+ return (*insn & 0xffff) == UPROBE_SWBP_INSN;
+#else
+ return *insn == UPROBE_SWBP_INSN;
+#endif
+}
+
+unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
+{
+ return instruction_pointer(regs);
+}
+
+int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
+ unsigned long addr)
+{
+ probe_opcode_t opcode;
+
+ opcode = *(probe_opcode_t *)(&auprobe->insn[0]);
+
+ auprobe->insn_size = GET_INSN_LENGTH(opcode);
+
+ switch (riscv_probe_decode_insn(&opcode, &auprobe->api)) {
+ case INSN_REJECTED:
+ return -EINVAL;
+
+ case INSN_GOOD_NO_SLOT:
+ auprobe->simulate = true;
+ break;
+
+ case INSN_GOOD:
+ auprobe->simulate = false;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+
+ utask->autask.saved_cause = current->thread.bad_cause;
+ current->thread.bad_cause = UPROBE_TRAP_NR;
+
+ instruction_pointer_set(regs, utask->xol_vaddr);
+
+ return 0;
+}
+
+int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+
+ WARN_ON_ONCE(current->thread.bad_cause != UPROBE_TRAP_NR);
+ current->thread.bad_cause = utask->autask.saved_cause;
+
+ instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
+
+ return 0;
+}
+
+bool arch_uprobe_xol_was_trapped(struct task_struct *t)
+{
+ if (t->thread.bad_cause != UPROBE_TRAP_NR)
+ return true;
+
+ return false;
+}
+
+bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ probe_opcode_t insn;
+ unsigned long addr;
+
+ if (!auprobe->simulate)
+ return false;
+
+ insn = *(probe_opcode_t *)(&auprobe->insn[0]);
+ addr = instruction_pointer(regs);
+
+ if (auprobe->api.handler)
+ auprobe->api.handler(insn, addr, regs);
+
+ return true;
+}
+
+void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+
+ current->thread.bad_cause = utask->autask.saved_cause;
+ /*
+ * Task has received a fatal signal, so reset back to probbed
+ * address.
+ */
+ instruction_pointer_set(regs, utask->vaddr);
+}
+
+bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx,
+ struct pt_regs *regs)
+{
+ if (ctx == RP_CHECK_CHAIN_CALL)
+ return regs->sp <= ret->stack;
+ else
+ return regs->sp < ret->stack;
+}
+
+unsigned long
+arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
+ struct pt_regs *regs)
+{
+ unsigned long ra;
+
+ ra = regs->ra;
+
+ regs->ra = trampoline_vaddr;
+
+ return ra;
+}
+
+int arch_uprobe_exception_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ return NOTIFY_DONE;
+}
+
+bool uprobe_breakpoint_handler(struct pt_regs *regs)
+{
+ if (uprobe_pre_sstep_notifier(regs))
+ return true;
+
+ return false;
+}
+
+bool uprobe_single_step_handler(struct pt_regs *regs)
+{
+ if (uprobe_post_sstep_notifier(regs))
+ return true;
+
+ return false;
+}
+
+void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
+ void *src, unsigned long len)
+{
+ /* Initialize the slot */
+ void *kaddr = kmap_atomic(page);
+ void *dst = kaddr + (vaddr & ~PAGE_MASK);
+
+ memcpy(dst, src, len);
+
+ /* Add ebreak behind opcode to simulate singlestep */
+ if (vaddr) {
+ dst += GET_INSN_LENGTH(*(probe_opcode_t *)src);
+ *(uprobe_opcode_t *)dst = __BUG_INSN_32;
+ }
+
+ kunmap_atomic(kaddr);
+
+ /*
+ * We probably need flush_icache_user_page() but it needs vma.
+ * This should work on most of architectures by default. If
+ * architecture needs to do something different it can define
+ * its own version of the function.
+ */
+ flush_dcache_page(page);
+}
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
new file mode 100644
index 000000000..8955f2432
--- /dev/null
+++ b/arch/riscv/kernel/process.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/tick.h>
+#include <linux/ptrace.h>
+#include <linux/uaccess.h>
+
+#include <asm/unistd.h>
+#include <asm/processor.h>
+#include <asm/csr.h>
+#include <asm/stacktrace.h>
+#include <asm/string.h>
+#include <asm/switch_to.h>
+#include <asm/thread_info.h>
+#include <asm/cpuidle.h>
+
+register unsigned long gp_in_global __asm__("gp");
+
+#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_STACKPROTECTOR_PER_TASK)
+#include <linux/stackprotector.h>
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+extern asmlinkage void ret_from_fork(void);
+extern asmlinkage void ret_from_kernel_thread(void);
+
+void arch_cpu_idle(void)
+{
+ cpu_do_idle();
+ raw_local_irq_enable();
+}
+
+void __show_regs(struct pt_regs *regs)
+{
+ show_regs_print_info(KERN_DEFAULT);
+
+ if (!user_mode(regs)) {
+ pr_cont("epc : %pS\n", (void *)regs->epc);
+ pr_cont(" ra : %pS\n", (void *)regs->ra);
+ }
+
+ pr_cont("epc : " REG_FMT " ra : " REG_FMT " sp : " REG_FMT "\n",
+ regs->epc, regs->ra, regs->sp);
+ pr_cont(" gp : " REG_FMT " tp : " REG_FMT " t0 : " REG_FMT "\n",
+ regs->gp, regs->tp, regs->t0);
+ pr_cont(" t1 : " REG_FMT " t2 : " REG_FMT " s0 : " REG_FMT "\n",
+ regs->t1, regs->t2, regs->s0);
+ pr_cont(" s1 : " REG_FMT " a0 : " REG_FMT " a1 : " REG_FMT "\n",
+ regs->s1, regs->a0, regs->a1);
+ pr_cont(" a2 : " REG_FMT " a3 : " REG_FMT " a4 : " REG_FMT "\n",
+ regs->a2, regs->a3, regs->a4);
+ pr_cont(" a5 : " REG_FMT " a6 : " REG_FMT " a7 : " REG_FMT "\n",
+ regs->a5, regs->a6, regs->a7);
+ pr_cont(" s2 : " REG_FMT " s3 : " REG_FMT " s4 : " REG_FMT "\n",
+ regs->s2, regs->s3, regs->s4);
+ pr_cont(" s5 : " REG_FMT " s6 : " REG_FMT " s7 : " REG_FMT "\n",
+ regs->s5, regs->s6, regs->s7);
+ pr_cont(" s8 : " REG_FMT " s9 : " REG_FMT " s10: " REG_FMT "\n",
+ regs->s8, regs->s9, regs->s10);
+ pr_cont(" s11: " REG_FMT " t3 : " REG_FMT " t4 : " REG_FMT "\n",
+ regs->s11, regs->t3, regs->t4);
+ pr_cont(" t5 : " REG_FMT " t6 : " REG_FMT "\n",
+ regs->t5, regs->t6);
+
+ pr_cont("status: " REG_FMT " badaddr: " REG_FMT " cause: " REG_FMT "\n",
+ regs->status, regs->badaddr, regs->cause);
+}
+void show_regs(struct pt_regs *regs)
+{
+ __show_regs(regs);
+ if (!user_mode(regs))
+ dump_backtrace(regs, NULL, KERN_DEFAULT);
+}
+
+#ifdef CONFIG_COMPAT
+static bool compat_mode_supported __read_mostly;
+
+bool compat_elf_check_arch(Elf32_Ehdr *hdr)
+{
+ return compat_mode_supported &&
+ hdr->e_machine == EM_RISCV &&
+ hdr->e_ident[EI_CLASS] == ELFCLASS32;
+}
+
+static int __init compat_mode_detect(void)
+{
+ unsigned long tmp = csr_read(CSR_STATUS);
+
+ csr_write(CSR_STATUS, (tmp & ~SR_UXL) | SR_UXL_32);
+ compat_mode_supported =
+ (csr_read(CSR_STATUS) & SR_UXL) == SR_UXL_32;
+
+ csr_write(CSR_STATUS, tmp);
+
+ pr_info("riscv: ELF compat mode %s",
+ compat_mode_supported ? "supported" : "unsupported");
+
+ return 0;
+}
+early_initcall(compat_mode_detect);
+#endif
+
+void start_thread(struct pt_regs *regs, unsigned long pc,
+ unsigned long sp)
+{
+ regs->status = SR_PIE;
+ if (has_fpu()) {
+ regs->status |= SR_FS_INITIAL;
+ /*
+ * Restore the initial value to the FP register
+ * before starting the user program.
+ */
+ fstate_restore(current, regs);
+ }
+ regs->epc = pc;
+ regs->sp = sp;
+
+#ifdef CONFIG_64BIT
+ regs->status &= ~SR_UXL;
+
+ if (is_compat_task())
+ regs->status |= SR_UXL_32;
+ else
+ regs->status |= SR_UXL_64;
+#endif
+}
+
+void flush_thread(void)
+{
+#ifdef CONFIG_FPU
+ /*
+ * Reset FPU state and context
+ * frm: round to nearest, ties to even (IEEE default)
+ * fflags: accrued exceptions cleared
+ */
+ fstate_off(current, task_pt_regs(current));
+ memset(&current->thread.fstate, 0, sizeof(current->thread.fstate));
+#endif
+}
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+ fstate_save(src, task_pt_regs(src));
+ *dst = *src;
+ return 0;
+}
+
+int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
+{
+ unsigned long clone_flags = args->flags;
+ unsigned long usp = args->stack;
+ unsigned long tls = args->tls;
+ struct pt_regs *childregs = task_pt_regs(p);
+
+ memset(&p->thread.s, 0, sizeof(p->thread.s));
+
+ /* p->thread holds context to be restored by __switch_to() */
+ if (unlikely(args->fn)) {
+ /* Kernel thread */
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->gp = gp_in_global;
+ /* Supervisor/Machine, irqs on: */
+ childregs->status = SR_PP | SR_PIE;
+
+ p->thread.ra = (unsigned long)ret_from_kernel_thread;
+ p->thread.s[0] = (unsigned long)args->fn;
+ p->thread.s[1] = (unsigned long)args->fn_arg;
+ } else {
+ *childregs = *(current_pt_regs());
+ if (usp) /* User fork */
+ childregs->sp = usp;
+ if (clone_flags & CLONE_SETTLS)
+ childregs->tp = tls;
+ childregs->a0 = 0; /* Return value of fork() */
+ p->thread.ra = (unsigned long)ret_from_fork;
+ }
+ p->thread.sp = (unsigned long)childregs; /* kernel sp */
+ return 0;
+}
diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
new file mode 100644
index 000000000..2ae8280ae
--- /dev/null
+++ b/arch/riscv/kernel/ptrace.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ * Copyright 2015 Regents of the University of California
+ * Copyright 2017 SiFive
+ *
+ * Copied from arch/tile/kernel/ptrace.c
+ */
+
+#include <asm/ptrace.h>
+#include <asm/syscall.h>
+#include <asm/thread_info.h>
+#include <asm/switch_to.h>
+#include <linux/audit.h>
+#include <linux/compat.h>
+#include <linux/ptrace.h>
+#include <linux/elf.h>
+#include <linux/regset.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
+enum riscv_regset {
+ REGSET_X,
+#ifdef CONFIG_FPU
+ REGSET_F,
+#endif
+};
+
+static int riscv_gpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ return membuf_write(&to, task_pt_regs(target),
+ sizeof(struct user_regs_struct));
+}
+
+static int riscv_gpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ struct pt_regs *regs;
+
+ regs = task_pt_regs(target);
+ return user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
+}
+
+#ifdef CONFIG_FPU
+static int riscv_fpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ struct __riscv_d_ext_state *fstate = &target->thread.fstate;
+
+ if (target == current)
+ fstate_save(current, task_pt_regs(current));
+
+ membuf_write(&to, fstate, offsetof(struct __riscv_d_ext_state, fcsr));
+ membuf_store(&to, fstate->fcsr);
+ return membuf_zero(&to, 4); // explicitly pad
+}
+
+static int riscv_fpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct __riscv_d_ext_state *fstate = &target->thread.fstate;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0,
+ offsetof(struct __riscv_d_ext_state, fcsr));
+ if (!ret) {
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0,
+ offsetof(struct __riscv_d_ext_state, fcsr) +
+ sizeof(fstate->fcsr));
+ }
+
+ return ret;
+}
+#endif
+
+static const struct user_regset riscv_user_regset[] = {
+ [REGSET_X] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(elf_greg_t),
+ .align = sizeof(elf_greg_t),
+ .regset_get = riscv_gpr_get,
+ .set = riscv_gpr_set,
+ },
+#ifdef CONFIG_FPU
+ [REGSET_F] = {
+ .core_note_type = NT_PRFPREG,
+ .n = ELF_NFPREG,
+ .size = sizeof(elf_fpreg_t),
+ .align = sizeof(elf_fpreg_t),
+ .regset_get = riscv_fpr_get,
+ .set = riscv_fpr_set,
+ },
+#endif
+};
+
+static const struct user_regset_view riscv_user_native_view = {
+ .name = "riscv",
+ .e_machine = EM_RISCV,
+ .regsets = riscv_user_regset,
+ .n = ARRAY_SIZE(riscv_user_regset),
+};
+
+struct pt_regs_offset {
+ const char *name;
+ int offset;
+};
+
+#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
+#define REG_OFFSET_END {.name = NULL, .offset = 0}
+
+static const struct pt_regs_offset regoffset_table[] = {
+ REG_OFFSET_NAME(epc),
+ REG_OFFSET_NAME(ra),
+ REG_OFFSET_NAME(sp),
+ REG_OFFSET_NAME(gp),
+ REG_OFFSET_NAME(tp),
+ REG_OFFSET_NAME(t0),
+ REG_OFFSET_NAME(t1),
+ REG_OFFSET_NAME(t2),
+ REG_OFFSET_NAME(s0),
+ REG_OFFSET_NAME(s1),
+ REG_OFFSET_NAME(a0),
+ REG_OFFSET_NAME(a1),
+ REG_OFFSET_NAME(a2),
+ REG_OFFSET_NAME(a3),
+ REG_OFFSET_NAME(a4),
+ REG_OFFSET_NAME(a5),
+ REG_OFFSET_NAME(a6),
+ REG_OFFSET_NAME(a7),
+ REG_OFFSET_NAME(s2),
+ REG_OFFSET_NAME(s3),
+ REG_OFFSET_NAME(s4),
+ REG_OFFSET_NAME(s5),
+ REG_OFFSET_NAME(s6),
+ REG_OFFSET_NAME(s7),
+ REG_OFFSET_NAME(s8),
+ REG_OFFSET_NAME(s9),
+ REG_OFFSET_NAME(s10),
+ REG_OFFSET_NAME(s11),
+ REG_OFFSET_NAME(t3),
+ REG_OFFSET_NAME(t4),
+ REG_OFFSET_NAME(t5),
+ REG_OFFSET_NAME(t6),
+ REG_OFFSET_NAME(status),
+ REG_OFFSET_NAME(badaddr),
+ REG_OFFSET_NAME(cause),
+ REG_OFFSET_NAME(orig_a0),
+ REG_OFFSET_END,
+};
+
+/**
+ * regs_query_register_offset() - query register offset from its name
+ * @name: the name of a register
+ *
+ * regs_query_register_offset() returns the offset of a register in struct
+ * pt_regs from its name. If the name is invalid, this returns -EINVAL;
+ */
+int regs_query_register_offset(const char *name)
+{
+ const struct pt_regs_offset *roff;
+
+ for (roff = regoffset_table; roff->name != NULL; roff++)
+ if (!strcmp(roff->name, name))
+ return roff->offset;
+ return -EINVAL;
+}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @addr: address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+static bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
+{
+ return (addr & ~(THREAD_SIZE - 1)) ==
+ (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @n: stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+ unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+
+ addr += n;
+ if (regs_within_kernel_stack(regs, (unsigned long)addr))
+ return *addr;
+ else
+ return 0;
+}
+
+void ptrace_disable(struct task_struct *child)
+{
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+}
+
+long arch_ptrace(struct task_struct *child, long request,
+ unsigned long addr, unsigned long data)
+{
+ long ret = -EIO;
+
+ switch (request) {
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
+
+/*
+ * Allows PTRACE_SYSCALL to work. These are called from entry.S in
+ * {handle,ret_from}_syscall.
+ */
+__visible int do_syscall_trace_enter(struct pt_regs *regs)
+{
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ if (ptrace_report_syscall_entry(regs))
+ return -1;
+
+ /*
+ * Do the secure computing after ptrace; failures should be fast.
+ * If this fails we might have return value in a0 from seccomp
+ * (via SECCOMP_RET_ERRNO/TRACE).
+ */
+ if (secure_computing() == -1)
+ return -1;
+
+#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_enter(regs, syscall_get_nr(current, regs));
+#endif
+
+ audit_syscall_entry(regs->a7, regs->a0, regs->a1, regs->a2, regs->a3);
+ return 0;
+}
+
+__visible void do_syscall_trace_exit(struct pt_regs *regs)
+{
+ audit_syscall_exit(regs);
+
+ if (test_thread_flag(TIF_SYSCALL_TRACE))
+ ptrace_report_syscall_exit(regs, 0);
+
+#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+ if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+ trace_sys_exit(regs, regs_return_value(regs));
+#endif
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_riscv_gpr_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ struct compat_user_regs_struct cregs;
+
+ regs_to_cregs(&cregs, task_pt_regs(target));
+
+ return membuf_write(&to, &cregs,
+ sizeof(struct compat_user_regs_struct));
+}
+
+static int compat_riscv_gpr_set(struct task_struct *target,
+ const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ struct compat_user_regs_struct cregs;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &cregs, 0, -1);
+
+ cregs_to_regs(&cregs, task_pt_regs(target));
+
+ return ret;
+}
+
+static const struct user_regset compat_riscv_user_regset[] = {
+ [REGSET_X] = {
+ .core_note_type = NT_PRSTATUS,
+ .n = ELF_NGREG,
+ .size = sizeof(compat_elf_greg_t),
+ .align = sizeof(compat_elf_greg_t),
+ .regset_get = compat_riscv_gpr_get,
+ .set = compat_riscv_gpr_set,
+ },
+#ifdef CONFIG_FPU
+ [REGSET_F] = {
+ .core_note_type = NT_PRFPREG,
+ .n = ELF_NFPREG,
+ .size = sizeof(elf_fpreg_t),
+ .align = sizeof(elf_fpreg_t),
+ .regset_get = riscv_fpr_get,
+ .set = riscv_fpr_set,
+ },
+#endif
+};
+
+static const struct user_regset_view compat_riscv_user_native_view = {
+ .name = "riscv",
+ .e_machine = EM_RISCV,
+ .regsets = compat_riscv_user_regset,
+ .n = ARRAY_SIZE(compat_riscv_user_regset),
+};
+
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+ compat_ulong_t caddr, compat_ulong_t cdata)
+{
+ long ret = -EIO;
+
+ switch (request) {
+ default:
+ ret = compat_ptrace_request(child, request, caddr, cdata);
+ break;
+ }
+
+ return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_COMPAT
+ if (test_tsk_thread_flag(task, TIF_32BIT))
+ return &compat_riscv_user_native_view;
+ else
+#endif
+ return &riscv_user_native_view;
+}
diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c
new file mode 100644
index 000000000..912288572
--- /dev/null
+++ b/arch/riscv/kernel/reset.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <linux/reboot.h>
+#include <linux/pm.h>
+
+static void default_power_off(void)
+{
+ while (1)
+ wait_for_interrupt();
+}
+
+void (*pm_power_off)(void) = NULL;
+EXPORT_SYMBOL(pm_power_off);
+
+void machine_restart(char *cmd)
+{
+ do_kernel_restart(cmd);
+ while (1);
+}
+
+void machine_halt(void)
+{
+ do_kernel_power_off();
+ default_power_off();
+}
+
+void machine_power_off(void)
+{
+ do_kernel_power_off();
+ default_power_off();
+}
diff --git a/arch/riscv/kernel/riscv_ksyms.c b/arch/riscv/kernel/riscv_ksyms.c
new file mode 100644
index 000000000..5ab1c7e1a
--- /dev/null
+++ b/arch/riscv/kernel/riscv_ksyms.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 Zihao Yu
+ */
+
+#include <linux/export.h>
+#include <linux/uaccess.h>
+
+/*
+ * Assembly functions that may be used (directly or indirectly) by modules
+ */
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(__memset);
+EXPORT_SYMBOL(__memcpy);
+EXPORT_SYMBOL(__memmove);
diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
new file mode 100644
index 000000000..5238026f7
--- /dev/null
+++ b/arch/riscv/kernel/sbi.c
@@ -0,0 +1,697 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SBI initialilization and all extension implementation.
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/bits.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+/* default SBI version is 0.1 */
+unsigned long sbi_spec_version __ro_after_init = SBI_SPEC_VERSION_DEFAULT;
+EXPORT_SYMBOL(sbi_spec_version);
+
+static void (*__sbi_set_timer)(uint64_t stime) __ro_after_init;
+static int (*__sbi_send_ipi)(const struct cpumask *cpu_mask) __ro_after_init;
+static int (*__sbi_rfence)(int fid, const struct cpumask *cpu_mask,
+ unsigned long start, unsigned long size,
+ unsigned long arg4, unsigned long arg5) __ro_after_init;
+
+struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
+ unsigned long arg1, unsigned long arg2,
+ unsigned long arg3, unsigned long arg4,
+ unsigned long arg5)
+{
+ struct sbiret ret;
+
+ register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
+ register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
+ register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
+ register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
+ register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
+ register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
+ register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
+ register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
+ asm volatile ("ecall"
+ : "+r" (a0), "+r" (a1)
+ : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
+ : "memory");
+ ret.error = a0;
+ ret.value = a1;
+
+ return ret;
+}
+EXPORT_SYMBOL(sbi_ecall);
+
+int sbi_err_map_linux_errno(int err)
+{
+ switch (err) {
+ case SBI_SUCCESS:
+ return 0;
+ case SBI_ERR_DENIED:
+ return -EPERM;
+ case SBI_ERR_INVALID_PARAM:
+ return -EINVAL;
+ case SBI_ERR_INVALID_ADDRESS:
+ return -EFAULT;
+ case SBI_ERR_NOT_SUPPORTED:
+ case SBI_ERR_FAILURE:
+ default:
+ return -ENOTSUPP;
+ };
+}
+EXPORT_SYMBOL(sbi_err_map_linux_errno);
+
+#ifdef CONFIG_RISCV_SBI_V01
+static unsigned long __sbi_v01_cpumask_to_hartmask(const struct cpumask *cpu_mask)
+{
+ unsigned long cpuid, hartid;
+ unsigned long hmask = 0;
+
+ /*
+ * There is no maximum hartid concept in RISC-V and NR_CPUS must not be
+ * associated with hartid. As SBI v0.1 is only kept for backward compatibility
+ * and will be removed in the future, there is no point in supporting hartid
+ * greater than BITS_PER_LONG (32 for RV32 and 64 for RV64). Ideally, SBI v0.2
+ * should be used for platforms with hartid greater than BITS_PER_LONG.
+ */
+ for_each_cpu(cpuid, cpu_mask) {
+ hartid = cpuid_to_hartid_map(cpuid);
+ if (hartid >= BITS_PER_LONG) {
+ pr_warn("Unable to send any request to hartid > BITS_PER_LONG for SBI v0.1\n");
+ break;
+ }
+ hmask |= BIT(hartid);
+ }
+
+ return hmask;
+}
+
+/**
+ * sbi_console_putchar() - Writes given character to the console device.
+ * @ch: The data to be written to the console.
+ *
+ * Return: None
+ */
+void sbi_console_putchar(int ch)
+{
+ sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0);
+}
+EXPORT_SYMBOL(sbi_console_putchar);
+
+/**
+ * sbi_console_getchar() - Reads a byte from console device.
+ *
+ * Returns the value read from console.
+ */
+int sbi_console_getchar(void)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0, 0, 0, 0, 0, 0);
+
+ return ret.error;
+}
+EXPORT_SYMBOL(sbi_console_getchar);
+
+/**
+ * sbi_shutdown() - Remove all the harts from executing supervisor code.
+ *
+ * Return: None
+ */
+void sbi_shutdown(void)
+{
+ sbi_ecall(SBI_EXT_0_1_SHUTDOWN, 0, 0, 0, 0, 0, 0, 0);
+}
+EXPORT_SYMBOL(sbi_shutdown);
+
+/**
+ * sbi_clear_ipi() - Clear any pending IPIs for the calling hart.
+ *
+ * Return: None
+ */
+void sbi_clear_ipi(void)
+{
+ sbi_ecall(SBI_EXT_0_1_CLEAR_IPI, 0, 0, 0, 0, 0, 0, 0);
+}
+EXPORT_SYMBOL(sbi_clear_ipi);
+
+/**
+ * __sbi_set_timer_v01() - Program the timer for next timer event.
+ * @stime_value: The value after which next timer event should fire.
+ *
+ * Return: None
+ */
+static void __sbi_set_timer_v01(uint64_t stime_value)
+{
+#if __riscv_xlen == 32
+ sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value,
+ stime_value >> 32, 0, 0, 0, 0);
+#else
+ sbi_ecall(SBI_EXT_0_1_SET_TIMER, 0, stime_value, 0, 0, 0, 0, 0);
+#endif
+}
+
+static int __sbi_send_ipi_v01(const struct cpumask *cpu_mask)
+{
+ unsigned long hart_mask;
+
+ if (!cpu_mask || cpumask_empty(cpu_mask))
+ cpu_mask = cpu_online_mask;
+ hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
+
+ sbi_ecall(SBI_EXT_0_1_SEND_IPI, 0, (unsigned long)(&hart_mask),
+ 0, 0, 0, 0, 0);
+ return 0;
+}
+
+static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
+ unsigned long start, unsigned long size,
+ unsigned long arg4, unsigned long arg5)
+{
+ int result = 0;
+ unsigned long hart_mask;
+
+ if (!cpu_mask || cpumask_empty(cpu_mask))
+ cpu_mask = cpu_online_mask;
+ hart_mask = __sbi_v01_cpumask_to_hartmask(cpu_mask);
+
+ /* v0.2 function IDs are equivalent to v0.1 extension IDs */
+ switch (fid) {
+ case SBI_EXT_RFENCE_REMOTE_FENCE_I:
+ sbi_ecall(SBI_EXT_0_1_REMOTE_FENCE_I, 0,
+ (unsigned long)&hart_mask, 0, 0, 0, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
+ sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA, 0,
+ (unsigned long)&hart_mask, start, size,
+ 0, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
+ sbi_ecall(SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID, 0,
+ (unsigned long)&hart_mask, start, size,
+ arg4, 0, 0);
+ break;
+ default:
+ pr_err("SBI call [%d]not supported in SBI v0.1\n", fid);
+ result = -EINVAL;
+ }
+
+ return result;
+}
+
+static void sbi_set_power_off(void)
+{
+ pm_power_off = sbi_shutdown;
+}
+#else
+static void __sbi_set_timer_v01(uint64_t stime_value)
+{
+ pr_warn("Timer extension is not available in SBI v%lu.%lu\n",
+ sbi_major_version(), sbi_minor_version());
+}
+
+static int __sbi_send_ipi_v01(const struct cpumask *cpu_mask)
+{
+ pr_warn("IPI extension is not available in SBI v%lu.%lu\n",
+ sbi_major_version(), sbi_minor_version());
+
+ return 0;
+}
+
+static int __sbi_rfence_v01(int fid, const struct cpumask *cpu_mask,
+ unsigned long start, unsigned long size,
+ unsigned long arg4, unsigned long arg5)
+{
+ pr_warn("remote fence extension is not available in SBI v%lu.%lu\n",
+ sbi_major_version(), sbi_minor_version());
+
+ return 0;
+}
+
+static void sbi_set_power_off(void) {}
+#endif /* CONFIG_RISCV_SBI_V01 */
+
+static void __sbi_set_timer_v02(uint64_t stime_value)
+{
+#if __riscv_xlen == 32
+ sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value,
+ stime_value >> 32, 0, 0, 0, 0);
+#else
+ sbi_ecall(SBI_EXT_TIME, SBI_EXT_TIME_SET_TIMER, stime_value, 0,
+ 0, 0, 0, 0);
+#endif
+}
+
+static int __sbi_send_ipi_v02(const struct cpumask *cpu_mask)
+{
+ unsigned long hartid, cpuid, hmask = 0, hbase = 0, htop = 0;
+ struct sbiret ret = {0};
+ int result;
+
+ if (!cpu_mask || cpumask_empty(cpu_mask))
+ cpu_mask = cpu_online_mask;
+
+ for_each_cpu(cpuid, cpu_mask) {
+ hartid = cpuid_to_hartid_map(cpuid);
+ if (hmask) {
+ if (hartid + BITS_PER_LONG <= htop ||
+ hbase + BITS_PER_LONG <= hartid) {
+ ret = sbi_ecall(SBI_EXT_IPI,
+ SBI_EXT_IPI_SEND_IPI, hmask,
+ hbase, 0, 0, 0, 0);
+ if (ret.error)
+ goto ecall_failed;
+ hmask = 0;
+ } else if (hartid < hbase) {
+ /* shift the mask to fit lower hartid */
+ hmask <<= hbase - hartid;
+ hbase = hartid;
+ }
+ }
+ if (!hmask) {
+ hbase = hartid;
+ htop = hartid;
+ } else if (hartid > htop) {
+ htop = hartid;
+ }
+ hmask |= BIT(hartid - hbase);
+ }
+
+ if (hmask) {
+ ret = sbi_ecall(SBI_EXT_IPI, SBI_EXT_IPI_SEND_IPI,
+ hmask, hbase, 0, 0, 0, 0);
+ if (ret.error)
+ goto ecall_failed;
+ }
+
+ return 0;
+
+ecall_failed:
+ result = sbi_err_map_linux_errno(ret.error);
+ pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n",
+ __func__, hbase, hmask, result);
+ return result;
+}
+
+static int __sbi_rfence_v02_call(unsigned long fid, unsigned long hmask,
+ unsigned long hbase, unsigned long start,
+ unsigned long size, unsigned long arg4,
+ unsigned long arg5)
+{
+ struct sbiret ret = {0};
+ int ext = SBI_EXT_RFENCE;
+ int result = 0;
+
+ switch (fid) {
+ case SBI_EXT_RFENCE_REMOTE_FENCE_I:
+ ret = sbi_ecall(ext, fid, hmask, hbase, 0, 0, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, arg4, 0);
+ break;
+
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, arg4, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, 0, 0);
+ break;
+ case SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID:
+ ret = sbi_ecall(ext, fid, hmask, hbase, start,
+ size, arg4, 0);
+ break;
+ default:
+ pr_err("unknown function ID [%lu] for SBI extension [%d]\n",
+ fid, ext);
+ result = -EINVAL;
+ }
+
+ if (ret.error) {
+ result = sbi_err_map_linux_errno(ret.error);
+ pr_err("%s: hbase = [%lu] hmask = [0x%lx] failed (error [%d])\n",
+ __func__, hbase, hmask, result);
+ }
+
+ return result;
+}
+
+static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
+ unsigned long start, unsigned long size,
+ unsigned long arg4, unsigned long arg5)
+{
+ unsigned long hartid, cpuid, hmask = 0, hbase = 0, htop = 0;
+ int result;
+
+ if (!cpu_mask || cpumask_empty(cpu_mask))
+ cpu_mask = cpu_online_mask;
+
+ for_each_cpu(cpuid, cpu_mask) {
+ hartid = cpuid_to_hartid_map(cpuid);
+ if (hmask) {
+ if (hartid + BITS_PER_LONG <= htop ||
+ hbase + BITS_PER_LONG <= hartid) {
+ result = __sbi_rfence_v02_call(fid, hmask,
+ hbase, start, size, arg4, arg5);
+ if (result)
+ return result;
+ hmask = 0;
+ } else if (hartid < hbase) {
+ /* shift the mask to fit lower hartid */
+ hmask <<= hbase - hartid;
+ hbase = hartid;
+ }
+ }
+ if (!hmask) {
+ hbase = hartid;
+ htop = hartid;
+ } else if (hartid > htop) {
+ htop = hartid;
+ }
+ hmask |= BIT(hartid - hbase);
+ }
+
+ if (hmask) {
+ result = __sbi_rfence_v02_call(fid, hmask, hbase,
+ start, size, arg4, arg5);
+ if (result)
+ return result;
+ }
+
+ return 0;
+}
+
+/**
+ * sbi_set_timer() - Program the timer for next timer event.
+ * @stime_value: The value after which next timer event should fire.
+ *
+ * Return: None.
+ */
+void sbi_set_timer(uint64_t stime_value)
+{
+ __sbi_set_timer(stime_value);
+}
+
+/**
+ * sbi_send_ipi() - Send an IPI to any hart.
+ * @cpu_mask: A cpu mask containing all the target harts.
+ *
+ * Return: 0 on success, appropriate linux error code otherwise.
+ */
+int sbi_send_ipi(const struct cpumask *cpu_mask)
+{
+ return __sbi_send_ipi(cpu_mask);
+}
+EXPORT_SYMBOL(sbi_send_ipi);
+
+/**
+ * sbi_remote_fence_i() - Execute FENCE.I instruction on given remote harts.
+ * @cpu_mask: A cpu mask containing all the target harts.
+ *
+ * Return: 0 on success, appropriate linux error code otherwise.
+ */
+int sbi_remote_fence_i(const struct cpumask *cpu_mask)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_FENCE_I,
+ cpu_mask, 0, 0, 0, 0);
+}
+EXPORT_SYMBOL(sbi_remote_fence_i);
+
+/**
+ * sbi_remote_sfence_vma() - Execute SFENCE.VMA instructions on given remote
+ * harts for the specified virtual address range.
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the virtual address
+ * @size: Total size of the virtual address range.
+ *
+ * Return: 0 on success, appropriate linux error code otherwise.
+ */
+int sbi_remote_sfence_vma(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA,
+ cpu_mask, start, size, 0, 0);
+}
+EXPORT_SYMBOL(sbi_remote_sfence_vma);
+
+/**
+ * sbi_remote_sfence_vma_asid() - Execute SFENCE.VMA instructions on given
+ * remote harts for a virtual address range belonging to a specific ASID.
+ *
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the virtual address
+ * @size: Total size of the virtual address range.
+ * @asid: The value of address space identifier (ASID).
+ *
+ * Return: 0 on success, appropriate linux error code otherwise.
+ */
+int sbi_remote_sfence_vma_asid(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long asid)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_SFENCE_VMA_ASID,
+ cpu_mask, start, size, asid, 0);
+}
+EXPORT_SYMBOL(sbi_remote_sfence_vma_asid);
+
+/**
+ * sbi_remote_hfence_gvma() - Execute HFENCE.GVMA instructions on given remote
+ * harts for the specified guest physical address range.
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the guest physical address
+ * @size: Total size of the guest physical address range.
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_gvma(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA,
+ cpu_mask, start, size, 0, 0);
+}
+EXPORT_SYMBOL_GPL(sbi_remote_hfence_gvma);
+
+/**
+ * sbi_remote_hfence_gvma_vmid() - Execute HFENCE.GVMA instructions on given
+ * remote harts for a guest physical address range belonging to a specific VMID.
+ *
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the guest physical address
+ * @size: Total size of the guest physical address range.
+ * @vmid: The value of guest ID (VMID).
+ *
+ * Return: 0 if success, Error otherwise.
+ */
+int sbi_remote_hfence_gvma_vmid(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long vmid)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_GVMA_VMID,
+ cpu_mask, start, size, vmid, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_gvma_vmid);
+
+/**
+ * sbi_remote_hfence_vvma() - Execute HFENCE.VVMA instructions on given remote
+ * harts for the current guest virtual address range.
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the current guest virtual address
+ * @size: Total size of the current guest virtual address range.
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_vvma(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA,
+ cpu_mask, start, size, 0, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_vvma);
+
+/**
+ * sbi_remote_hfence_vvma_asid() - Execute HFENCE.VVMA instructions on given
+ * remote harts for current guest virtual address range belonging to a specific
+ * ASID.
+ *
+ * @cpu_mask: A cpu mask containing all the target harts.
+ * @start: Start of the current guest virtual address
+ * @size: Total size of the current guest virtual address range.
+ * @asid: The value of address space identifier (ASID).
+ *
+ * Return: None
+ */
+int sbi_remote_hfence_vvma_asid(const struct cpumask *cpu_mask,
+ unsigned long start,
+ unsigned long size,
+ unsigned long asid)
+{
+ return __sbi_rfence(SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID,
+ cpu_mask, start, size, asid, 0);
+}
+EXPORT_SYMBOL(sbi_remote_hfence_vvma_asid);
+
+static void sbi_srst_reset(unsigned long type, unsigned long reason)
+{
+ sbi_ecall(SBI_EXT_SRST, SBI_EXT_SRST_RESET, type, reason,
+ 0, 0, 0, 0);
+ pr_warn("%s: type=0x%lx reason=0x%lx failed\n",
+ __func__, type, reason);
+}
+
+static int sbi_srst_reboot(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ sbi_srst_reset((mode == REBOOT_WARM || mode == REBOOT_SOFT) ?
+ SBI_SRST_RESET_TYPE_WARM_REBOOT :
+ SBI_SRST_RESET_TYPE_COLD_REBOOT,
+ SBI_SRST_RESET_REASON_NONE);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block sbi_srst_reboot_nb;
+
+static void sbi_srst_power_off(void)
+{
+ sbi_srst_reset(SBI_SRST_RESET_TYPE_SHUTDOWN,
+ SBI_SRST_RESET_REASON_NONE);
+}
+
+/**
+ * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
+ * @extid: The extension ID to be probed.
+ *
+ * Return: 1 or an extension specific nonzero value if yes, 0 otherwise.
+ */
+long sbi_probe_extension(int extid)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, extid,
+ 0, 0, 0, 0, 0);
+ if (!ret.error)
+ return ret.value;
+
+ return 0;
+}
+EXPORT_SYMBOL(sbi_probe_extension);
+
+static long __sbi_base_ecall(int fid)
+{
+ struct sbiret ret;
+
+ ret = sbi_ecall(SBI_EXT_BASE, fid, 0, 0, 0, 0, 0, 0);
+ if (!ret.error)
+ return ret.value;
+ else
+ return sbi_err_map_linux_errno(ret.error);
+}
+
+static inline long sbi_get_spec_version(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_SPEC_VERSION);
+}
+
+static inline long sbi_get_firmware_id(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_ID);
+}
+
+static inline long sbi_get_firmware_version(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_IMP_VERSION);
+}
+
+long sbi_get_mvendorid(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_MVENDORID);
+}
+
+long sbi_get_marchid(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_MARCHID);
+}
+
+long sbi_get_mimpid(void)
+{
+ return __sbi_base_ecall(SBI_EXT_BASE_GET_MIMPID);
+}
+
+static void sbi_send_cpumask_ipi(const struct cpumask *target)
+{
+ sbi_send_ipi(target);
+}
+
+static const struct riscv_ipi_ops sbi_ipi_ops = {
+ .ipi_inject = sbi_send_cpumask_ipi
+};
+
+void __init sbi_init(void)
+{
+ int ret;
+
+ sbi_set_power_off();
+ ret = sbi_get_spec_version();
+ if (ret > 0)
+ sbi_spec_version = ret;
+
+ pr_info("SBI specification v%lu.%lu detected\n",
+ sbi_major_version(), sbi_minor_version());
+
+ if (!sbi_spec_is_0_1()) {
+ pr_info("SBI implementation ID=0x%lx Version=0x%lx\n",
+ sbi_get_firmware_id(), sbi_get_firmware_version());
+ if (sbi_probe_extension(SBI_EXT_TIME)) {
+ __sbi_set_timer = __sbi_set_timer_v02;
+ pr_info("SBI TIME extension detected\n");
+ } else {
+ __sbi_set_timer = __sbi_set_timer_v01;
+ }
+ if (sbi_probe_extension(SBI_EXT_IPI)) {
+ __sbi_send_ipi = __sbi_send_ipi_v02;
+ pr_info("SBI IPI extension detected\n");
+ } else {
+ __sbi_send_ipi = __sbi_send_ipi_v01;
+ }
+ if (sbi_probe_extension(SBI_EXT_RFENCE)) {
+ __sbi_rfence = __sbi_rfence_v02;
+ pr_info("SBI RFENCE extension detected\n");
+ } else {
+ __sbi_rfence = __sbi_rfence_v01;
+ }
+ if ((sbi_spec_version >= sbi_mk_version(0, 3)) &&
+ sbi_probe_extension(SBI_EXT_SRST)) {
+ pr_info("SBI SRST extension detected\n");
+ pm_power_off = sbi_srst_power_off;
+ sbi_srst_reboot_nb.notifier_call = sbi_srst_reboot;
+ sbi_srst_reboot_nb.priority = 192;
+ register_restart_handler(&sbi_srst_reboot_nb);
+ }
+ } else {
+ __sbi_set_timer = __sbi_set_timer_v01;
+ __sbi_send_ipi = __sbi_send_ipi_v01;
+ __sbi_rfence = __sbi_rfence_v01;
+ }
+
+ riscv_set_ipi_ops(&sbi_ipi_ops);
+}
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
new file mode 100644
index 000000000..2acf51c23
--- /dev/null
+++ b/arch/riscv/kernel/setup.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2020 FORTH-ICS/CARV
+ * Nick Kossifidis <mick@ics.forth.gr>
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+#include <linux/sched.h>
+#include <linux/console.h>
+#include <linux/screen_info.h>
+#include <linux/of_fdt.h>
+#include <linux/of_platform.h>
+#include <linux/sched/task.h>
+#include <linux/smp.h>
+#include <linux/efi.h>
+#include <linux/crash_dump.h>
+
+#include <asm/alternative.h>
+#include <asm/cacheflush.h>
+#include <asm/cpu_ops.h>
+#include <asm/early_ioremap.h>
+#include <asm/pgtable.h>
+#include <asm/setup.h>
+#include <asm/set_memory.h>
+#include <asm/sections.h>
+#include <asm/sbi.h>
+#include <asm/tlbflush.h>
+#include <asm/thread_info.h>
+#include <asm/kasan.h>
+#include <asm/efi.h>
+
+#include "head.h"
+
+#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)
+struct screen_info screen_info __section(".data") = {
+ .orig_video_lines = 30,
+ .orig_video_cols = 80,
+ .orig_video_mode = 0,
+ .orig_video_ega_bx = 0,
+ .orig_video_isVGA = 1,
+ .orig_video_points = 8
+};
+#endif
+
+/*
+ * The lucky hart to first increment this variable will boot the other cores.
+ * This is used before the kernel initializes the BSS so it can't be in the
+ * BSS.
+ */
+atomic_t hart_lottery __section(".sdata")
+#ifdef CONFIG_XIP_KERNEL
+= ATOMIC_INIT(0xC001BEEF)
+#endif
+;
+unsigned long boot_cpu_hartid;
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+
+/*
+ * Place kernel memory regions on the resource tree so that
+ * kexec-tools can retrieve them from /proc/iomem. While there
+ * also add "System RAM" regions for compatibility with other
+ * archs, and the rest of the known regions for completeness.
+ */
+static struct resource kimage_res = { .name = "Kernel image", };
+static struct resource code_res = { .name = "Kernel code", };
+static struct resource data_res = { .name = "Kernel data", };
+static struct resource rodata_res = { .name = "Kernel rodata", };
+static struct resource bss_res = { .name = "Kernel bss", };
+#ifdef CONFIG_CRASH_DUMP
+static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
+#endif
+
+static int __init add_resource(struct resource *parent,
+ struct resource *res)
+{
+ int ret = 0;
+
+ ret = insert_resource(parent, res);
+ if (ret < 0) {
+ pr_err("Failed to add a %s resource at %llx\n",
+ res->name, (unsigned long long) res->start);
+ return ret;
+ }
+
+ return 1;
+}
+
+static int __init add_kernel_resources(void)
+{
+ int ret = 0;
+
+ /*
+ * The memory region of the kernel image is continuous and
+ * was reserved on setup_bootmem, register it here as a
+ * resource, with the various segments of the image as
+ * child nodes.
+ */
+
+ code_res.start = __pa_symbol(_text);
+ code_res.end = __pa_symbol(_etext) - 1;
+ code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ rodata_res.start = __pa_symbol(__start_rodata);
+ rodata_res.end = __pa_symbol(__end_rodata) - 1;
+ rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ data_res.start = __pa_symbol(_data);
+ data_res.end = __pa_symbol(_edata) - 1;
+ data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ bss_res.start = __pa_symbol(__bss_start);
+ bss_res.end = __pa_symbol(__bss_stop) - 1;
+ bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ kimage_res.start = code_res.start;
+ kimage_res.end = bss_res.end;
+ kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+
+ ret = add_resource(&iomem_resource, &kimage_res);
+ if (ret < 0)
+ return ret;
+
+ ret = add_resource(&kimage_res, &code_res);
+ if (ret < 0)
+ return ret;
+
+ ret = add_resource(&kimage_res, &rodata_res);
+ if (ret < 0)
+ return ret;
+
+ ret = add_resource(&kimage_res, &data_res);
+ if (ret < 0)
+ return ret;
+
+ ret = add_resource(&kimage_res, &bss_res);
+
+ return ret;
+}
+
+static void __init init_resources(void)
+{
+ struct memblock_region *region = NULL;
+ struct resource *res = NULL;
+ struct resource *mem_res = NULL;
+ size_t mem_res_sz = 0;
+ int num_resources = 0, res_idx = 0;
+ int ret = 0;
+
+ /* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
+ num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
+ res_idx = num_resources - 1;
+
+ mem_res_sz = num_resources * sizeof(*mem_res);
+ mem_res = memblock_alloc(mem_res_sz, SMP_CACHE_BYTES);
+ if (!mem_res)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz);
+
+ /*
+ * Start by adding the reserved regions, if they overlap
+ * with /memory regions, insert_resource later on will take
+ * care of it.
+ */
+ ret = add_kernel_resources();
+ if (ret < 0)
+ goto error;
+
+#ifdef CONFIG_KEXEC_CORE
+ if (crashk_res.start != crashk_res.end) {
+ ret = add_resource(&iomem_resource, &crashk_res);
+ if (ret < 0)
+ goto error;
+ }
+#endif
+
+#ifdef CONFIG_CRASH_DUMP
+ if (elfcorehdr_size > 0) {
+ elfcorehdr_res.start = elfcorehdr_addr;
+ elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
+ elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ add_resource(&iomem_resource, &elfcorehdr_res);
+ }
+#endif
+
+ for_each_reserved_mem_region(region) {
+ res = &mem_res[res_idx--];
+
+ res->name = "Reserved";
+ res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
+ res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
+ res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
+
+ /*
+ * Ignore any other reserved regions within
+ * system memory.
+ */
+ if (memblock_is_memory(res->start)) {
+ /* Re-use this pre-allocated resource */
+ res_idx++;
+ continue;
+ }
+
+ ret = add_resource(&iomem_resource, res);
+ if (ret < 0)
+ goto error;
+ }
+
+ /* Add /memory regions to the resource tree */
+ for_each_mem_region(region) {
+ res = &mem_res[res_idx--];
+
+ if (unlikely(memblock_is_nomap(region))) {
+ res->name = "Reserved";
+ res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
+ } else {
+ res->name = "System RAM";
+ res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ }
+
+ res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
+ res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+
+ ret = add_resource(&iomem_resource, res);
+ if (ret < 0)
+ goto error;
+ }
+
+ /* Clean-up any unused pre-allocated resources */
+ if (res_idx >= 0)
+ memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
+ return;
+
+ error:
+ /* Better an empty resource tree than an inconsistent one */
+ release_child_resources(&iomem_resource);
+ memblock_free(mem_res, mem_res_sz);
+}
+
+
+static void __init parse_dtb(void)
+{
+ /* Early scan of device tree from init memory */
+ if (early_init_dt_scan(dtb_early_va)) {
+ const char *name = of_flat_dt_get_machine_name();
+
+ if (name) {
+ pr_info("Machine model: %s\n", name);
+ dump_stack_set_arch_desc("%s (DT)", name);
+ }
+ } else {
+ pr_err("No DTB passed to the kernel\n");
+ }
+
+#ifdef CONFIG_CMDLINE_FORCE
+ strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+ pr_info("Forcing kernel command line to: %s\n", boot_command_line);
+#endif
+}
+
+void __init setup_arch(char **cmdline_p)
+{
+ parse_dtb();
+ setup_initial_init_mm(_stext, _etext, _edata, _end);
+
+ *cmdline_p = boot_command_line;
+
+ early_ioremap_setup();
+ jump_label_init();
+ parse_early_param();
+
+ efi_init();
+ paging_init();
+#if IS_ENABLED(CONFIG_BUILTIN_DTB)
+ unflatten_and_copy_device_tree();
+#else
+ unflatten_device_tree();
+#endif
+ misc_mem_init();
+
+ init_resources();
+ sbi_init();
+
+#ifdef CONFIG_KASAN
+ kasan_init();
+#endif
+
+#ifdef CONFIG_SMP
+ setup_smp();
+#endif
+
+ riscv_init_cbom_blocksize();
+ riscv_fill_hwcap();
+ apply_boot_alternatives();
+}
+
+static int __init topology_init(void)
+{
+ int i, ret;
+
+ for_each_possible_cpu(i) {
+ struct cpu *cpu = &per_cpu(cpu_devices, i);
+
+ cpu->hotpluggable = cpu_has_hotplug(i);
+ ret = register_cpu(cpu, i);
+ if (unlikely(ret))
+ pr_warn("Warning: %s: register_cpu %d failed (%d)\n",
+ __func__, i, ret);
+ }
+
+ return 0;
+}
+subsys_initcall(topology_init);
+
+void free_initmem(void)
+{
+ if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
+ set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx);
+ if (IS_ENABLED(CONFIG_64BIT))
+ set_kernel_memory(__init_begin, __init_end, set_memory_nx);
+ }
+
+ free_initmem_default(POISON_FREE_INITMEM);
+}
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
new file mode 100644
index 000000000..dee66c929
--- /dev/null
+++ b/arch/riscv/kernel/signal.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ * Chen Liqin <liqin.chen@sunplusct.com>
+ * Lennox Wu <lennox.wu@sunplusct.com>
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <linux/compat.h>
+#include <linux/signal.h>
+#include <linux/uaccess.h>
+#include <linux/syscalls.h>
+#include <linux/resume_user_mode.h>
+#include <linux/linkage.h>
+
+#include <asm/ucontext.h>
+#include <asm/vdso.h>
+#include <asm/signal.h>
+#include <asm/signal32.h>
+#include <asm/switch_to.h>
+#include <asm/csr.h>
+#include <asm/cacheflush.h>
+
+extern u32 __user_rt_sigreturn[2];
+
+#define DEBUG_SIG 0
+
+struct rt_sigframe {
+ struct siginfo info;
+ struct ucontext uc;
+#ifndef CONFIG_MMU
+ u32 sigreturn_code[2];
+#endif
+};
+
+#ifdef CONFIG_FPU
+static long restore_fp_state(struct pt_regs *regs,
+ union __riscv_fp_state __user *sc_fpregs)
+{
+ long err;
+ struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
+ size_t i;
+
+ err = __copy_from_user(&current->thread.fstate, state, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ fstate_restore(current, regs);
+
+ /* We support no other extension state at this time. */
+ for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
+ u32 value;
+
+ err = __get_user(value, &sc_fpregs->q.reserved[i]);
+ if (unlikely(err))
+ break;
+ if (value != 0)
+ return -EINVAL;
+ }
+
+ return err;
+}
+
+static long save_fp_state(struct pt_regs *regs,
+ union __riscv_fp_state __user *sc_fpregs)
+{
+ long err;
+ struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
+ size_t i;
+
+ fstate_save(current, regs);
+ err = __copy_to_user(state, &current->thread.fstate, sizeof(*state));
+ if (unlikely(err))
+ return err;
+
+ /* We support no other extension state at this time. */
+ for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
+ err = __put_user(0, &sc_fpregs->q.reserved[i]);
+ if (unlikely(err))
+ break;
+ }
+
+ return err;
+}
+#else
+#define save_fp_state(task, regs) (0)
+#define restore_fp_state(task, regs) (0)
+#endif
+
+static long restore_sigcontext(struct pt_regs *regs,
+ struct sigcontext __user *sc)
+{
+ long err;
+ /* sc_regs is structured the same as the start of pt_regs */
+ err = __copy_from_user(regs, &sc->sc_regs, sizeof(sc->sc_regs));
+ /* Restore the floating-point state. */
+ if (has_fpu())
+ err |= restore_fp_state(regs, &sc->sc_fpregs);
+ return err;
+}
+
+SYSCALL_DEFINE0(rt_sigreturn)
+{
+ struct pt_regs *regs = current_pt_regs();
+ struct rt_sigframe __user *frame;
+ struct task_struct *task;
+ sigset_t set;
+
+ /* Always make any pending restarted system calls return -EINTR */
+ current->restart_block.fn = do_no_restart_syscall;
+
+ frame = (struct rt_sigframe __user *)regs->sp;
+
+ if (!access_ok(frame, sizeof(*frame)))
+ goto badframe;
+
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ set_current_blocked(&set);
+
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ goto badframe;
+
+ if (restore_altstack(&frame->uc.uc_stack))
+ goto badframe;
+
+ regs->cause = -1UL;
+
+ return regs->a0;
+
+badframe:
+ task = current;
+ if (show_unhandled_signals) {
+ pr_info_ratelimited(
+ "%s[%d]: bad frame in %s: frame=%p pc=%p sp=%p\n",
+ task->comm, task_pid_nr(task), __func__,
+ frame, (void *)regs->epc, (void *)regs->sp);
+ }
+ force_sig(SIGSEGV);
+ return 0;
+}
+
+static long setup_sigcontext(struct rt_sigframe __user *frame,
+ struct pt_regs *regs)
+{
+ struct sigcontext __user *sc = &frame->uc.uc_mcontext;
+ long err;
+ /* sc_regs is structured the same as the start of pt_regs */
+ err = __copy_to_user(&sc->sc_regs, regs, sizeof(sc->sc_regs));
+ /* Save the floating-point state. */
+ if (has_fpu())
+ err |= save_fp_state(regs, &sc->sc_fpregs);
+ return err;
+}
+
+static inline void __user *get_sigframe(struct ksignal *ksig,
+ struct pt_regs *regs, size_t framesize)
+{
+ unsigned long sp;
+ /* Default to using normal stack */
+ sp = regs->sp;
+
+ /*
+ * If we are on the alternate signal stack and would overflow it, don't.
+ * Return an always-bogus address instead so we will die with SIGSEGV.
+ */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
+ return (void __user __force *)(-1UL);
+
+ /* This is the X/Open sanctioned signal stack switching. */
+ sp = sigsp(sp, ksig) - framesize;
+
+ /* Align the stack frame. */
+ sp &= ~0xfUL;
+
+ return (void __user *)sp;
+}
+
+static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
+ struct pt_regs *regs)
+{
+ struct rt_sigframe __user *frame;
+ long err = 0;
+ unsigned long __maybe_unused addr;
+
+ frame = get_sigframe(ksig, regs, sizeof(*frame));
+ if (!access_ok(frame, sizeof(*frame)))
+ return -EFAULT;
+
+ err |= copy_siginfo_to_user(&frame->info, &ksig->info);
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(NULL, &frame->uc.uc_link);
+ err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
+ err |= setup_sigcontext(frame, regs);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+ if (err)
+ return -EFAULT;
+
+ /* Set up to return from userspace. */
+#ifdef CONFIG_MMU
+ regs->ra = (unsigned long)VDSO_SYMBOL(
+ current->mm->context.vdso, rt_sigreturn);
+#else
+ /*
+ * For the nommu case we don't have a VDSO. Instead we push two
+ * instructions to call the rt_sigreturn syscall onto the user stack.
+ */
+ if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
+ sizeof(frame->sigreturn_code)))
+ return -EFAULT;
+
+ addr = (unsigned long)&frame->sigreturn_code;
+ /* Make sure the two instructions are pushed to icache. */
+ flush_icache_range(addr, addr + sizeof(frame->sigreturn_code));
+
+ regs->ra = addr;
+#endif /* CONFIG_MMU */
+
+ /*
+ * Set up registers for signal handler.
+ * Registers that we don't modify keep the value they had from
+ * user-space at the time we took the signal.
+ * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
+ * since some things rely on this (e.g. glibc's debug/segfault.c).
+ */
+ regs->epc = (unsigned long)ksig->ka.sa.sa_handler;
+ regs->sp = (unsigned long)frame;
+ regs->a0 = ksig->sig; /* a0: signal number */
+ regs->a1 = (unsigned long)(&frame->info); /* a1: siginfo pointer */
+ regs->a2 = (unsigned long)(&frame->uc); /* a2: ucontext pointer */
+
+#if DEBUG_SIG
+ pr_info("SIG deliver (%s:%d): sig=%d pc=%p ra=%p sp=%p\n",
+ current->comm, task_pid_nr(current), ksig->sig,
+ (void *)regs->epc, (void *)regs->ra, frame);
+#endif
+
+ return 0;
+}
+
+static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
+{
+ sigset_t *oldset = sigmask_to_save();
+ int ret;
+
+ /* Are we from a system call? */
+ if (regs->cause == EXC_SYSCALL) {
+ /* Avoid additional syscall restarting via ret_from_exception */
+ regs->cause = -1UL;
+ /* If so, check system call restarting.. */
+ switch (regs->a0) {
+ case -ERESTART_RESTARTBLOCK:
+ case -ERESTARTNOHAND:
+ regs->a0 = -EINTR;
+ break;
+
+ case -ERESTARTSYS:
+ if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
+ regs->a0 = -EINTR;
+ break;
+ }
+ fallthrough;
+ case -ERESTARTNOINTR:
+ regs->a0 = regs->orig_a0;
+ regs->epc -= 0x4;
+ break;
+ }
+ }
+
+ rseq_signal_deliver(ksig, regs);
+
+ /* Set up the stack frame */
+ if (is_compat_task())
+ ret = compat_setup_rt_frame(ksig, oldset, regs);
+ else
+ ret = setup_rt_frame(ksig, oldset, regs);
+
+ signal_setup_done(ret, ksig, 0);
+}
+
+static void do_signal(struct pt_regs *regs)
+{
+ struct ksignal ksig;
+
+ if (get_signal(&ksig)) {
+ /* Actually deliver the signal */
+ handle_signal(&ksig, regs);
+ return;
+ }
+
+ /* Did we come from a system call? */
+ if (regs->cause == EXC_SYSCALL) {
+ /* Avoid additional syscall restarting via ret_from_exception */
+ regs->cause = -1UL;
+
+ /* Restart the system call - no handlers present */
+ switch (regs->a0) {
+ case -ERESTARTNOHAND:
+ case -ERESTARTSYS:
+ case -ERESTARTNOINTR:
+ regs->a0 = regs->orig_a0;
+ regs->epc -= 0x4;
+ break;
+ case -ERESTART_RESTARTBLOCK:
+ regs->a0 = regs->orig_a0;
+ regs->a7 = __NR_restart_syscall;
+ regs->epc -= 0x4;
+ break;
+ }
+ }
+
+ /*
+ * If there is no signal to deliver, we just put the saved
+ * sigmask back.
+ */
+ restore_saved_sigmask();
+}
+
+/*
+ * Handle any pending work on the resume-to-userspace path, as indicated by
+ * _TIF_WORK_MASK. Entered from assembly with IRQs off.
+ */
+asmlinkage __visible void do_work_pending(struct pt_regs *regs,
+ unsigned long thread_info_flags)
+{
+ do {
+ if (thread_info_flags & _TIF_NEED_RESCHED) {
+ schedule();
+ } else {
+ local_irq_enable();
+ if (thread_info_flags & _TIF_UPROBE)
+ uprobe_notify_resume(regs);
+ /* Handle pending signal delivery */
+ if (thread_info_flags & (_TIF_SIGPENDING |
+ _TIF_NOTIFY_SIGNAL))
+ do_signal(regs);
+ if (thread_info_flags & _TIF_NOTIFY_RESUME)
+ resume_user_mode_work(regs);
+ }
+ local_irq_disable();
+ thread_info_flags = read_thread_flags();
+ } while (thread_info_flags & _TIF_WORK_MASK);
+}
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
new file mode 100644
index 000000000..7f534023f
--- /dev/null
+++ b/arch/riscv/kernel/smp.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMP initialisation and IPI support
+ * Based on arch/arm64/kernel/smp.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 2015 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/cpu.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/profile.h>
+#include <linux/smp.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/irq_work.h>
+
+#include <asm/sbi.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/cpu_ops.h>
+
+enum ipi_message_type {
+ IPI_RESCHEDULE,
+ IPI_CALL_FUNC,
+ IPI_CPU_STOP,
+ IPI_CPU_CRASH_STOP,
+ IPI_IRQ_WORK,
+ IPI_TIMER,
+ IPI_MAX
+};
+
+unsigned long __cpuid_to_hartid_map[NR_CPUS] __ro_after_init = {
+ [0 ... NR_CPUS-1] = INVALID_HARTID
+};
+
+void __init smp_setup_processor_id(void)
+{
+ cpuid_to_hartid_map(0) = boot_cpu_hartid;
+}
+
+/* A collection of single bit ipi messages. */
+static struct {
+ unsigned long stats[IPI_MAX] ____cacheline_aligned;
+ unsigned long bits ____cacheline_aligned;
+} ipi_data[NR_CPUS] __cacheline_aligned;
+
+int riscv_hartid_to_cpuid(unsigned long hartid)
+{
+ int i;
+
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpuid_to_hartid_map(i) == hartid)
+ return i;
+
+ return -ENOENT;
+}
+
+bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
+{
+ return phys_id == cpuid_to_hartid_map(cpu);
+}
+
+static void ipi_stop(void)
+{
+ set_cpu_online(smp_processor_id(), false);
+ while (1)
+ wait_for_interrupt();
+}
+
+#ifdef CONFIG_KEXEC_CORE
+static atomic_t waiting_for_crash_ipi = ATOMIC_INIT(0);
+
+static inline void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
+{
+ crash_save_cpu(regs, cpu);
+
+ atomic_dec(&waiting_for_crash_ipi);
+
+ local_irq_disable();
+
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpu_has_hotplug(cpu))
+ cpu_ops[cpu]->cpu_stop();
+#endif
+
+ for(;;)
+ wait_for_interrupt();
+}
+#else
+static inline void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
+{
+ unreachable();
+}
+#endif
+
+static const struct riscv_ipi_ops *ipi_ops __ro_after_init;
+
+void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
+{
+ ipi_ops = ops;
+}
+EXPORT_SYMBOL_GPL(riscv_set_ipi_ops);
+
+void riscv_clear_ipi(void)
+{
+ if (ipi_ops && ipi_ops->ipi_clear)
+ ipi_ops->ipi_clear();
+
+ csr_clear(CSR_IP, IE_SIE);
+}
+EXPORT_SYMBOL_GPL(riscv_clear_ipi);
+
+static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op)
+{
+ int cpu;
+
+ smp_mb__before_atomic();
+ for_each_cpu(cpu, mask)
+ set_bit(op, &ipi_data[cpu].bits);
+ smp_mb__after_atomic();
+
+ if (ipi_ops && ipi_ops->ipi_inject)
+ ipi_ops->ipi_inject(mask);
+ else
+ pr_warn("SMP: IPI inject method not available\n");
+}
+
+static void send_ipi_single(int cpu, enum ipi_message_type op)
+{
+ smp_mb__before_atomic();
+ set_bit(op, &ipi_data[cpu].bits);
+ smp_mb__after_atomic();
+
+ if (ipi_ops && ipi_ops->ipi_inject)
+ ipi_ops->ipi_inject(cpumask_of(cpu));
+ else
+ pr_warn("SMP: IPI inject method not available\n");
+}
+
+#ifdef CONFIG_IRQ_WORK
+void arch_irq_work_raise(void)
+{
+ send_ipi_single(smp_processor_id(), IPI_IRQ_WORK);
+}
+#endif
+
+void handle_IPI(struct pt_regs *regs)
+{
+ unsigned int cpu = smp_processor_id();
+ unsigned long *pending_ipis = &ipi_data[cpu].bits;
+ unsigned long *stats = ipi_data[cpu].stats;
+
+ riscv_clear_ipi();
+
+ while (true) {
+ unsigned long ops;
+
+ /* Order bit clearing and data access. */
+ mb();
+
+ ops = xchg(pending_ipis, 0);
+ if (ops == 0)
+ return;
+
+ if (ops & (1 << IPI_RESCHEDULE)) {
+ stats[IPI_RESCHEDULE]++;
+ scheduler_ipi();
+ }
+
+ if (ops & (1 << IPI_CALL_FUNC)) {
+ stats[IPI_CALL_FUNC]++;
+ generic_smp_call_function_interrupt();
+ }
+
+ if (ops & (1 << IPI_CPU_STOP)) {
+ stats[IPI_CPU_STOP]++;
+ ipi_stop();
+ }
+
+ if (ops & (1 << IPI_CPU_CRASH_STOP)) {
+ ipi_cpu_crash_stop(cpu, get_irq_regs());
+ }
+
+ if (ops & (1 << IPI_IRQ_WORK)) {
+ stats[IPI_IRQ_WORK]++;
+ irq_work_run();
+ }
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+ if (ops & (1 << IPI_TIMER)) {
+ stats[IPI_TIMER]++;
+ tick_receive_broadcast();
+ }
+#endif
+ BUG_ON((ops >> IPI_MAX) != 0);
+
+ /* Order data access and bit testing. */
+ mb();
+ }
+}
+
+static const char * const ipi_names[] = {
+ [IPI_RESCHEDULE] = "Rescheduling interrupts",
+ [IPI_CALL_FUNC] = "Function call interrupts",
+ [IPI_CPU_STOP] = "CPU stop interrupts",
+ [IPI_CPU_CRASH_STOP] = "CPU stop (for crash dump) interrupts",
+ [IPI_IRQ_WORK] = "IRQ work interrupts",
+ [IPI_TIMER] = "Timer broadcast interrupts",
+};
+
+void show_ipi_stats(struct seq_file *p, int prec)
+{
+ unsigned int cpu, i;
+
+ for (i = 0; i < IPI_MAX; i++) {
+ seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
+ prec >= 4 ? " " : "");
+ for_each_online_cpu(cpu)
+ seq_printf(p, "%10lu ", ipi_data[cpu].stats[i]);
+ seq_printf(p, " %s\n", ipi_names[i]);
+ }
+}
+
+void arch_send_call_function_ipi_mask(struct cpumask *mask)
+{
+ send_ipi_mask(mask, IPI_CALL_FUNC);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+ send_ipi_single(cpu, IPI_CALL_FUNC);
+}
+
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+void tick_broadcast(const struct cpumask *mask)
+{
+ send_ipi_mask(mask, IPI_TIMER);
+}
+#endif
+
+void smp_send_stop(void)
+{
+ unsigned long timeout;
+
+ if (num_online_cpus() > 1) {
+ cpumask_t mask;
+
+ cpumask_copy(&mask, cpu_online_mask);
+ cpumask_clear_cpu(smp_processor_id(), &mask);
+
+ if (system_state <= SYSTEM_RUNNING)
+ pr_crit("SMP: stopping secondary CPUs\n");
+ send_ipi_mask(&mask, IPI_CPU_STOP);
+ }
+
+ /* Wait up to one second for other CPUs to stop */
+ timeout = USEC_PER_SEC;
+ while (num_online_cpus() > 1 && timeout--)
+ udelay(1);
+
+ if (num_online_cpus() > 1)
+ pr_warn("SMP: failed to stop secondary CPUs %*pbl\n",
+ cpumask_pr_args(cpu_online_mask));
+}
+
+#ifdef CONFIG_KEXEC_CORE
+/*
+ * The number of CPUs online, not counting this CPU (which may not be
+ * fully online and so not counted in num_online_cpus()).
+ */
+static inline unsigned int num_other_online_cpus(void)
+{
+ unsigned int this_cpu_online = cpu_online(smp_processor_id());
+
+ return num_online_cpus() - this_cpu_online;
+}
+
+void crash_smp_send_stop(void)
+{
+ static int cpus_stopped;
+ cpumask_t mask;
+ unsigned long timeout;
+
+ /*
+ * This function can be called twice in panic path, but obviously
+ * we execute this only once.
+ */
+ if (cpus_stopped)
+ return;
+
+ cpus_stopped = 1;
+
+ /*
+ * If this cpu is the only one alive at this point in time, online or
+ * not, there are no stop messages to be sent around, so just back out.
+ */
+ if (num_other_online_cpus() == 0)
+ return;
+
+ cpumask_copy(&mask, cpu_online_mask);
+ cpumask_clear_cpu(smp_processor_id(), &mask);
+
+ atomic_set(&waiting_for_crash_ipi, num_other_online_cpus());
+
+ pr_crit("SMP: stopping secondary CPUs\n");
+ send_ipi_mask(&mask, IPI_CPU_CRASH_STOP);
+
+ /* Wait up to one second for other CPUs to stop */
+ timeout = USEC_PER_SEC;
+ while ((atomic_read(&waiting_for_crash_ipi) > 0) && timeout--)
+ udelay(1);
+
+ if (atomic_read(&waiting_for_crash_ipi) > 0)
+ pr_warn("SMP: failed to stop secondary CPUs %*pbl\n",
+ cpumask_pr_args(&mask));
+}
+
+bool smp_crash_stop_failed(void)
+{
+ return (atomic_read(&waiting_for_crash_ipi) > 0);
+}
+#endif
+
+void smp_send_reschedule(int cpu)
+{
+ send_ipi_single(cpu, IPI_RESCHEDULE);
+}
+EXPORT_SYMBOL_GPL(smp_send_reschedule);
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
new file mode 100644
index 000000000..ddb2afba6
--- /dev/null
+++ b/arch/riscv/kernel/smpboot.c
@@ -0,0 +1,184 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMP initialisation and IPI support
+ * Based on arch/arm64/kernel/smp.c
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Copyright (C) 2015 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/arch_topology.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/percpu.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/sched/task_stack.h>
+#include <linux/sched/mm.h>
+#include <asm/cpu_ops.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <asm/numa.h>
+#include <asm/tlbflush.h>
+#include <asm/sections.h>
+#include <asm/sbi.h>
+#include <asm/smp.h>
+
+#include "head.h"
+
+static DECLARE_COMPLETION(cpu_running);
+
+void __init smp_prepare_boot_cpu(void)
+{
+}
+
+void __init smp_prepare_cpus(unsigned int max_cpus)
+{
+ int cpuid;
+ int ret;
+ unsigned int curr_cpuid;
+
+ init_cpu_topology();
+
+ curr_cpuid = smp_processor_id();
+ store_cpu_topology(curr_cpuid);
+ numa_store_cpu_info(curr_cpuid);
+ numa_add_cpu(curr_cpuid);
+
+ /* This covers non-smp usecase mandated by "nosmp" option */
+ if (max_cpus == 0)
+ return;
+
+ for_each_possible_cpu(cpuid) {
+ if (cpuid == curr_cpuid)
+ continue;
+ if (cpu_ops[cpuid]->cpu_prepare) {
+ ret = cpu_ops[cpuid]->cpu_prepare(cpuid);
+ if (ret)
+ continue;
+ }
+ set_cpu_present(cpuid, true);
+ numa_store_cpu_info(cpuid);
+ }
+}
+
+void __init setup_smp(void)
+{
+ struct device_node *dn;
+ unsigned long hart;
+ bool found_boot_cpu = false;
+ int cpuid = 1;
+ int rc;
+
+ cpu_set_ops(0);
+
+ for_each_of_cpu_node(dn) {
+ rc = riscv_of_processor_hartid(dn, &hart);
+ if (rc < 0)
+ continue;
+
+ if (hart == cpuid_to_hartid_map(0)) {
+ BUG_ON(found_boot_cpu);
+ found_boot_cpu = 1;
+ early_map_cpu_to_node(0, of_node_to_nid(dn));
+ continue;
+ }
+ if (cpuid >= NR_CPUS) {
+ pr_warn("Invalid cpuid [%d] for hartid [%lu]\n",
+ cpuid, hart);
+ continue;
+ }
+
+ cpuid_to_hartid_map(cpuid) = hart;
+ early_map_cpu_to_node(cpuid, of_node_to_nid(dn));
+ cpuid++;
+ }
+
+ BUG_ON(!found_boot_cpu);
+
+ if (cpuid > nr_cpu_ids)
+ pr_warn("Total number of cpus [%d] is greater than nr_cpus option value [%d]\n",
+ cpuid, nr_cpu_ids);
+
+ for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
+ if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
+ cpu_set_ops(cpuid);
+ set_cpu_possible(cpuid, true);
+ }
+ }
+}
+
+static int start_secondary_cpu(int cpu, struct task_struct *tidle)
+{
+ if (cpu_ops[cpu]->cpu_start)
+ return cpu_ops[cpu]->cpu_start(cpu, tidle);
+
+ return -EOPNOTSUPP;
+}
+
+int __cpu_up(unsigned int cpu, struct task_struct *tidle)
+{
+ int ret = 0;
+ tidle->thread_info.cpu = cpu;
+
+ ret = start_secondary_cpu(cpu, tidle);
+ if (!ret) {
+ wait_for_completion_timeout(&cpu_running,
+ msecs_to_jiffies(1000));
+
+ if (!cpu_online(cpu)) {
+ pr_crit("CPU%u: failed to come online\n", cpu);
+ ret = -EIO;
+ }
+ } else {
+ pr_crit("CPU%u: failed to start\n", cpu);
+ }
+
+ return ret;
+}
+
+void __init smp_cpus_done(unsigned int max_cpus)
+{
+}
+
+/*
+ * C entry point for a secondary processor.
+ */
+asmlinkage __visible void smp_callin(void)
+{
+ struct mm_struct *mm = &init_mm;
+ unsigned int curr_cpuid = smp_processor_id();
+
+ riscv_clear_ipi();
+
+ /* All kernel threads share the same mm context. */
+ mmgrab(mm);
+ current->active_mm = mm;
+
+ store_cpu_topology(curr_cpuid);
+ notify_cpu_starting(curr_cpuid);
+ numa_add_cpu(curr_cpuid);
+ set_cpu_online(curr_cpuid, 1);
+
+ /*
+ * Remote TLB flushes are ignored while the CPU is offline, so emit
+ * a local TLB flush right now just in case.
+ */
+ local_flush_tlb_all();
+ complete(&cpu_running);
+ /*
+ * Disable preemption before enabling interrupts, so we don't try to
+ * schedule a CPU that hasn't actually started yet.
+ */
+ local_irq_enable();
+ cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
+}
diff --git a/arch/riscv/kernel/soc.c b/arch/riscv/kernel/soc.c
new file mode 100644
index 000000000..a0516172a
--- /dev/null
+++ b/arch/riscv/kernel/soc.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+#include <linux/init.h>
+#include <linux/libfdt.h>
+#include <linux/pgtable.h>
+#include <asm/soc.h>
+
+/*
+ * This is called extremly early, before parse_dtb(), to allow initializing
+ * SoC hardware before memory or any device driver initialization.
+ */
+void __init soc_early_init(void)
+{
+ void (*early_fn)(const void *fdt);
+ const struct of_device_id *s;
+ const void *fdt = dtb_early_va;
+
+ for (s = (void *)&__soc_early_init_table_start;
+ (void *)s < (void *)&__soc_early_init_table_end; s++) {
+ if (!fdt_node_check_compatible(fdt, 0, s->compatible)) {
+ early_fn = s->data;
+ early_fn(fdt);
+ return;
+ }
+ }
+}
diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
new file mode 100644
index 000000000..17d7383f2
--- /dev/null
+++ b/arch/riscv/kernel/stacktrace.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2008 ARM Limited
+ * Copyright (C) 2014 Regents of the University of California
+ */
+
+#include <linux/export.h>
+#include <linux/kallsyms.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/stacktrace.h>
+#include <linux/ftrace.h>
+
+#include <asm/stacktrace.h>
+
+#ifdef CONFIG_FRAME_POINTER
+
+void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
+ bool (*fn)(void *, unsigned long), void *arg)
+{
+ unsigned long fp, sp, pc;
+ int level = 0;
+
+ if (regs) {
+ fp = frame_pointer(regs);
+ sp = user_stack_pointer(regs);
+ pc = instruction_pointer(regs);
+ } else if (task == NULL || task == current) {
+ fp = (unsigned long)__builtin_frame_address(0);
+ sp = current_stack_pointer;
+ pc = (unsigned long)walk_stackframe;
+ level = -1;
+ } else {
+ /* task blocked in __switch_to */
+ fp = task->thread.s[0];
+ sp = task->thread.sp;
+ pc = task->thread.ra;
+ }
+
+ for (;;) {
+ unsigned long low, high;
+ struct stackframe *frame;
+
+ if (unlikely(!__kernel_text_address(pc) || (level++ >= 0 && !fn(arg, pc))))
+ break;
+
+ /* Validate frame pointer */
+ low = sp + sizeof(struct stackframe);
+ high = ALIGN(sp, THREAD_SIZE);
+ if (unlikely(fp < low || fp > high || fp & 0x7))
+ break;
+ /* Unwind stack frame */
+ frame = (struct stackframe *)fp - 1;
+ sp = fp;
+ if (regs && (regs->epc == pc) && (frame->fp & 0x7)) {
+ fp = frame->ra;
+ pc = regs->ra;
+ } else {
+ fp = frame->fp;
+ pc = ftrace_graph_ret_addr(current, NULL, frame->ra,
+ &frame->ra);
+ }
+
+ }
+}
+
+#else /* !CONFIG_FRAME_POINTER */
+
+void notrace walk_stackframe(struct task_struct *task,
+ struct pt_regs *regs, bool (*fn)(void *, unsigned long), void *arg)
+{
+ unsigned long sp, pc;
+ unsigned long *ksp;
+
+ if (regs) {
+ sp = user_stack_pointer(regs);
+ pc = instruction_pointer(regs);
+ } else if (task == NULL || task == current) {
+ sp = current_stack_pointer;
+ pc = (unsigned long)walk_stackframe;
+ } else {
+ /* task blocked in __switch_to */
+ sp = task->thread.sp;
+ pc = task->thread.ra;
+ }
+
+ if (unlikely(sp & 0x7))
+ return;
+
+ ksp = (unsigned long *)sp;
+ while (!kstack_end(ksp)) {
+ if (__kernel_text_address(pc) && unlikely(!fn(arg, pc)))
+ break;
+ pc = READ_ONCE_NOCHECK(*ksp++) - 0x4;
+ }
+}
+
+#endif /* CONFIG_FRAME_POINTER */
+
+static bool print_trace_address(void *arg, unsigned long pc)
+{
+ const char *loglvl = arg;
+
+ print_ip_sym(loglvl, pc);
+ return true;
+}
+
+noinline void dump_backtrace(struct pt_regs *regs, struct task_struct *task,
+ const char *loglvl)
+{
+ walk_stackframe(task, regs, print_trace_address, (void *)loglvl);
+}
+
+void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
+{
+ pr_cont("%sCall Trace:\n", loglvl);
+ dump_backtrace(NULL, task, loglvl);
+}
+
+static bool save_wchan(void *arg, unsigned long pc)
+{
+ if (!in_sched_functions(pc)) {
+ unsigned long *p = arg;
+ *p = pc;
+ return false;
+ }
+ return true;
+}
+
+unsigned long __get_wchan(struct task_struct *task)
+{
+ unsigned long pc = 0;
+
+ if (!try_get_task_stack(task))
+ return 0;
+ walk_stackframe(task, NULL, save_wchan, &pc);
+ put_task_stack(task);
+ return pc;
+}
+
+noinline void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
+ struct task_struct *task, struct pt_regs *regs)
+{
+ walk_stackframe(task, regs, consume_entry, cookie);
+}
diff --git a/arch/riscv/kernel/suspend.c b/arch/riscv/kernel/suspend.c
new file mode 100644
index 000000000..9ba24fb8c
--- /dev/null
+++ b/arch/riscv/kernel/suspend.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ * Copyright (c) 2022 Ventana Micro Systems Inc.
+ */
+
+#include <linux/ftrace.h>
+#include <asm/csr.h>
+#include <asm/suspend.h>
+
+static void suspend_save_csrs(struct suspend_context *context)
+{
+ context->scratch = csr_read(CSR_SCRATCH);
+ context->tvec = csr_read(CSR_TVEC);
+ context->ie = csr_read(CSR_IE);
+
+ /*
+ * No need to save/restore IP CSR (i.e. MIP or SIP) because:
+ *
+ * 1. For no-MMU (M-mode) kernel, the bits in MIP are set by
+ * external devices (such as interrupt controller, timer, etc).
+ * 2. For MMU (S-mode) kernel, the bits in SIP are set by
+ * M-mode firmware and external devices (such as interrupt
+ * controller, etc).
+ */
+
+#ifdef CONFIG_MMU
+ context->satp = csr_read(CSR_SATP);
+#endif
+}
+
+static void suspend_restore_csrs(struct suspend_context *context)
+{
+ csr_write(CSR_SCRATCH, context->scratch);
+ csr_write(CSR_TVEC, context->tvec);
+ csr_write(CSR_IE, context->ie);
+
+#ifdef CONFIG_MMU
+ csr_write(CSR_SATP, context->satp);
+#endif
+}
+
+int cpu_suspend(unsigned long arg,
+ int (*finish)(unsigned long arg,
+ unsigned long entry,
+ unsigned long context))
+{
+ int rc = 0;
+ struct suspend_context context = { 0 };
+
+ /* Finisher should be non-NULL */
+ if (!finish)
+ return -EINVAL;
+
+ /* Save additional CSRs*/
+ suspend_save_csrs(&context);
+
+ /*
+ * Function graph tracer state gets incosistent when the kernel
+ * calls functions that never return (aka finishers) hence disable
+ * graph tracing during their execution.
+ */
+ pause_graph_tracing();
+
+ /* Save context on stack */
+ if (__cpu_suspend_enter(&context)) {
+ /* Call the finisher */
+ rc = finish(arg, __pa_symbol(__cpu_resume_enter),
+ (ulong)&context);
+
+ /*
+ * Should never reach here, unless the suspend finisher
+ * fails. Successful cpu_suspend() should return from
+ * __cpu_resume_entry()
+ */
+ if (!rc)
+ rc = -EOPNOTSUPP;
+ }
+
+ /* Enable function graph tracer */
+ unpause_graph_tracing();
+
+ /* Restore additional CSRs */
+ suspend_restore_csrs(&context);
+
+ return rc;
+}
diff --git a/arch/riscv/kernel/suspend_entry.S b/arch/riscv/kernel/suspend_entry.S
new file mode 100644
index 000000000..aafcca58c
--- /dev/null
+++ b/arch/riscv/kernel/suspend_entry.S
@@ -0,0 +1,125 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
+ * Copyright (c) 2022 Ventana Micro Systems Inc.
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/csr.h>
+#include <asm/xip_fixup.h>
+
+ .text
+ .altmacro
+ .option norelax
+
+ENTRY(__cpu_suspend_enter)
+ /* Save registers (except A0 and T0-T6) */
+ REG_S ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
+ REG_S sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
+ REG_S gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
+ REG_S tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
+ REG_S s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
+ REG_S s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
+ REG_S a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
+ REG_S a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
+ REG_S a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
+ REG_S a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
+ REG_S a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
+ REG_S a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
+ REG_S a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
+ REG_S s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
+ REG_S s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
+ REG_S s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
+ REG_S s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
+ REG_S s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
+ REG_S s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
+ REG_S s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
+ REG_S s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
+ REG_S s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
+ REG_S s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
+
+ /* Save CSRs */
+ csrr t0, CSR_EPC
+ REG_S t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
+ csrr t0, CSR_STATUS
+ REG_S t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
+ csrr t0, CSR_TVAL
+ REG_S t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
+ csrr t0, CSR_CAUSE
+ REG_S t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
+
+ /* Return non-zero value */
+ li a0, 1
+
+ /* Return to C code */
+ ret
+END(__cpu_suspend_enter)
+
+ENTRY(__cpu_resume_enter)
+ /* Load the global pointer */
+ .option push
+ .option norelax
+ la gp, __global_pointer$
+ .option pop
+
+#ifdef CONFIG_MMU
+ /* Save A0 and A1 */
+ add t0, a0, zero
+ add t1, a1, zero
+
+ /* Enable MMU */
+ la a0, swapper_pg_dir
+ XIP_FIXUP_OFFSET a0
+ call relocate_enable_mmu
+
+ /* Restore A0 and A1 */
+ add a0, t0, zero
+ add a1, t1, zero
+#endif
+
+ /* Make A0 point to suspend context */
+ add a0, a1, zero
+
+ /* Restore CSRs */
+ REG_L t0, (SUSPEND_CONTEXT_REGS + PT_EPC)(a0)
+ csrw CSR_EPC, t0
+ REG_L t0, (SUSPEND_CONTEXT_REGS + PT_STATUS)(a0)
+ csrw CSR_STATUS, t0
+ REG_L t0, (SUSPEND_CONTEXT_REGS + PT_BADADDR)(a0)
+ csrw CSR_TVAL, t0
+ REG_L t0, (SUSPEND_CONTEXT_REGS + PT_CAUSE)(a0)
+ csrw CSR_CAUSE, t0
+
+ /* Restore registers (except A0 and T0-T6) */
+ REG_L ra, (SUSPEND_CONTEXT_REGS + PT_RA)(a0)
+ REG_L sp, (SUSPEND_CONTEXT_REGS + PT_SP)(a0)
+ REG_L gp, (SUSPEND_CONTEXT_REGS + PT_GP)(a0)
+ REG_L tp, (SUSPEND_CONTEXT_REGS + PT_TP)(a0)
+ REG_L s0, (SUSPEND_CONTEXT_REGS + PT_S0)(a0)
+ REG_L s1, (SUSPEND_CONTEXT_REGS + PT_S1)(a0)
+ REG_L a1, (SUSPEND_CONTEXT_REGS + PT_A1)(a0)
+ REG_L a2, (SUSPEND_CONTEXT_REGS + PT_A2)(a0)
+ REG_L a3, (SUSPEND_CONTEXT_REGS + PT_A3)(a0)
+ REG_L a4, (SUSPEND_CONTEXT_REGS + PT_A4)(a0)
+ REG_L a5, (SUSPEND_CONTEXT_REGS + PT_A5)(a0)
+ REG_L a6, (SUSPEND_CONTEXT_REGS + PT_A6)(a0)
+ REG_L a7, (SUSPEND_CONTEXT_REGS + PT_A7)(a0)
+ REG_L s2, (SUSPEND_CONTEXT_REGS + PT_S2)(a0)
+ REG_L s3, (SUSPEND_CONTEXT_REGS + PT_S3)(a0)
+ REG_L s4, (SUSPEND_CONTEXT_REGS + PT_S4)(a0)
+ REG_L s5, (SUSPEND_CONTEXT_REGS + PT_S5)(a0)
+ REG_L s6, (SUSPEND_CONTEXT_REGS + PT_S6)(a0)
+ REG_L s7, (SUSPEND_CONTEXT_REGS + PT_S7)(a0)
+ REG_L s8, (SUSPEND_CONTEXT_REGS + PT_S8)(a0)
+ REG_L s9, (SUSPEND_CONTEXT_REGS + PT_S9)(a0)
+ REG_L s10, (SUSPEND_CONTEXT_REGS + PT_S10)(a0)
+ REG_L s11, (SUSPEND_CONTEXT_REGS + PT_S11)(a0)
+
+ /* Return zero value */
+ add a0, zero, zero
+
+ /* Return to C code */
+ ret
+END(__cpu_resume_enter)
diff --git a/arch/riscv/kernel/sys_riscv.c b/arch/riscv/kernel/sys_riscv.c
new file mode 100644
index 000000000..5d3f2fbeb
--- /dev/null
+++ b/arch/riscv/kernel/sys_riscv.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2014 Darius Rad <darius@bluespec.com>
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/syscalls.h>
+#include <asm/unistd.h>
+#include <asm/cacheflush.h>
+#include <asm-generic/mman-common.h>
+
+static long riscv_sys_mmap(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, off_t offset,
+ unsigned long page_shift_offset)
+{
+ if (unlikely(offset & (~PAGE_MASK >> page_shift_offset)))
+ return -EINVAL;
+
+ return ksys_mmap_pgoff(addr, len, prot, flags, fd,
+ offset >> (PAGE_SHIFT - page_shift_offset));
+}
+
+#ifdef CONFIG_64BIT
+SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, off_t, offset)
+{
+ return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 0);
+}
+#endif
+
+#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT)
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+ unsigned long, prot, unsigned long, flags,
+ unsigned long, fd, off_t, offset)
+{
+ /*
+ * Note that the shift for mmap2 is constant (12),
+ * regardless of PAGE_SIZE
+ */
+ return riscv_sys_mmap(addr, len, prot, flags, fd, offset, 12);
+}
+#endif
+
+/*
+ * Allows the instruction cache to be flushed from userspace. Despite RISC-V
+ * having a direct 'fence.i' instruction available to userspace (which we
+ * can't trap!), that's not actually viable when running on Linux because the
+ * kernel might schedule a process on another hart. There is no way for
+ * userspace to handle this without invoking the kernel (as it doesn't know the
+ * thread->hart mappings), so we've defined a RISC-V specific system call to
+ * flush the instruction cache.
+ *
+ * sys_riscv_flush_icache() is defined to flush the instruction cache over an
+ * address range, with the flush applying to either all threads or just the
+ * caller. We don't currently do anything with the address range, that's just
+ * in there for forwards compatibility.
+ */
+SYSCALL_DEFINE3(riscv_flush_icache, uintptr_t, start, uintptr_t, end,
+ uintptr_t, flags)
+{
+ /* Check the reserved flags. */
+ if (unlikely(flags & ~SYS_RISCV_FLUSH_ICACHE_ALL))
+ return -EINVAL;
+
+ flush_icache_mm(current->mm, flags & SYS_RISCV_FLUSH_ICACHE_LOCAL);
+
+ return 0;
+}
diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
new file mode 100644
index 000000000..44b1420a2
--- /dev/null
+++ b/arch/riscv/kernel/syscall_table.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2009 Arnd Bergmann <arnd@arndb.de>
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <linux/linkage.h>
+#include <linux/syscalls.h>
+#include <asm-generic/syscalls.h>
+#include <asm/syscall.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+void * const sys_call_table[__NR_syscalls] = {
+ [0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c
new file mode 100644
index 000000000..1cf21db4f
--- /dev/null
+++ b/arch/riscv/kernel/time.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/of_clk.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/delay.h>
+#include <asm/sbi.h>
+#include <asm/processor.h>
+#include <asm/timex.h>
+
+unsigned long riscv_timebase __ro_after_init;
+EXPORT_SYMBOL_GPL(riscv_timebase);
+
+void __init time_init(void)
+{
+ struct device_node *cpu;
+ u32 prop;
+
+ cpu = of_find_node_by_path("/cpus");
+ if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
+ panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
+ of_node_put(cpu);
+ riscv_timebase = prop;
+
+ lpj_fine = riscv_timebase / HZ;
+
+ of_clk_init(NULL);
+ timer_probe();
+
+ tick_setup_hrtimer_broadcast();
+}
+
+void clocksource_arch_init(struct clocksource *cs)
+{
+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
+ cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER;
+#else
+ cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
+#endif
+}
diff --git a/arch/riscv/kernel/trace_irq.c b/arch/riscv/kernel/trace_irq.c
new file mode 100644
index 000000000..095ac976d
--- /dev/null
+++ b/arch/riscv/kernel/trace_irq.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
+ */
+
+#include <linux/irqflags.h>
+#include <linux/kprobes.h>
+#include "trace_irq.h"
+
+/*
+ * trace_hardirqs_on/off require the caller to setup frame pointer properly.
+ * Otherwise, CALLER_ADDR1 might trigger an pagging exception in kernel.
+ * Here we add one extra level so they can be safely called by low
+ * level entry code which $fp is used for other purpose.
+ */
+
+void __trace_hardirqs_on(void)
+{
+ trace_hardirqs_on();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_on);
+
+void __trace_hardirqs_off(void)
+{
+ trace_hardirqs_off();
+}
+NOKPROBE_SYMBOL(__trace_hardirqs_off);
diff --git a/arch/riscv/kernel/trace_irq.h b/arch/riscv/kernel/trace_irq.h
new file mode 100644
index 000000000..99fe67377
--- /dev/null
+++ b/arch/riscv/kernel/trace_irq.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 Changbin Du <changbin.du@gmail.com>
+ */
+#ifndef __TRACE_IRQ_H
+#define __TRACE_IRQ_H
+
+void __trace_hardirqs_on(void);
+void __trace_hardirqs_off(void);
+
+#endif /* __TRACE_IRQ_H */
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
new file mode 100644
index 000000000..5d07f6b3c
--- /dev/null
+++ b/arch/riscv/kernel/traps.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/signal.h>
+#include <linux/signal.h>
+#include <linux/kdebug.h>
+#include <linux/uaccess.h>
+#include <linux/kprobes.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/kexec.h>
+
+#include <asm/asm-prototypes.h>
+#include <asm/bug.h>
+#include <asm/csr.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/thread_info.h>
+
+int show_unhandled_signals = 1;
+
+static DEFINE_SPINLOCK(die_lock);
+
+void die(struct pt_regs *regs, const char *str)
+{
+ static int die_counter;
+ int ret;
+ long cause;
+ unsigned long flags;
+
+ oops_enter();
+
+ spin_lock_irqsave(&die_lock, flags);
+ console_verbose();
+ bust_spinlocks(1);
+
+ pr_emerg("%s [#%d]\n", str, ++die_counter);
+ print_modules();
+ if (regs)
+ show_regs(regs);
+
+ cause = regs ? regs->cause : -1;
+ ret = notify_die(DIE_OOPS, str, regs, 0, cause, SIGSEGV);
+
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
+
+ bust_spinlocks(0);
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
+ spin_unlock_irqrestore(&die_lock, flags);
+ oops_exit();
+
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+ if (panic_on_oops)
+ panic("Fatal exception");
+ if (ret != NOTIFY_STOP)
+ make_task_dead(SIGSEGV);
+}
+
+void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
+{
+ struct task_struct *tsk = current;
+
+ if (show_unhandled_signals && unhandled_signal(tsk, signo)
+ && printk_ratelimit()) {
+ pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x" REG_FMT,
+ tsk->comm, task_pid_nr(tsk), signo, code, addr);
+ print_vma_addr(KERN_CONT " in ", instruction_pointer(regs));
+ pr_cont("\n");
+ __show_regs(regs);
+ }
+
+ force_sig_fault(signo, code, (void __user *)addr);
+}
+
+static void do_trap_error(struct pt_regs *regs, int signo, int code,
+ unsigned long addr, const char *str)
+{
+ current->thread.bad_cause = regs->cause;
+
+ if (user_mode(regs)) {
+ do_trap(regs, signo, code, addr);
+ } else {
+ if (!fixup_exception(regs))
+ die(regs, str);
+ }
+}
+
+#if defined(CONFIG_XIP_KERNEL) && defined(CONFIG_RISCV_ALTERNATIVE)
+#define __trap_section __section(".xip.traps")
+#else
+#define __trap_section
+#endif
+#define DO_ERROR_INFO(name, signo, code, str) \
+asmlinkage __visible __trap_section void name(struct pt_regs *regs) \
+{ \
+ do_trap_error(regs, signo, code, regs->epc, "Oops - " str); \
+}
+
+DO_ERROR_INFO(do_trap_unknown,
+ SIGILL, ILL_ILLTRP, "unknown exception");
+DO_ERROR_INFO(do_trap_insn_misaligned,
+ SIGBUS, BUS_ADRALN, "instruction address misaligned");
+DO_ERROR_INFO(do_trap_insn_fault,
+ SIGSEGV, SEGV_ACCERR, "instruction access fault");
+DO_ERROR_INFO(do_trap_insn_illegal,
+ SIGILL, ILL_ILLOPC, "illegal instruction");
+DO_ERROR_INFO(do_trap_load_fault,
+ SIGSEGV, SEGV_ACCERR, "load access fault");
+#ifndef CONFIG_RISCV_M_MODE
+DO_ERROR_INFO(do_trap_load_misaligned,
+ SIGBUS, BUS_ADRALN, "Oops - load address misaligned");
+DO_ERROR_INFO(do_trap_store_misaligned,
+ SIGBUS, BUS_ADRALN, "Oops - store (or AMO) address misaligned");
+#else
+int handle_misaligned_load(struct pt_regs *regs);
+int handle_misaligned_store(struct pt_regs *regs);
+
+asmlinkage void __trap_section do_trap_load_misaligned(struct pt_regs *regs)
+{
+ if (!handle_misaligned_load(regs))
+ return;
+ do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc,
+ "Oops - load address misaligned");
+}
+
+asmlinkage void __trap_section do_trap_store_misaligned(struct pt_regs *regs)
+{
+ if (!handle_misaligned_store(regs))
+ return;
+ do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->epc,
+ "Oops - store (or AMO) address misaligned");
+}
+#endif
+DO_ERROR_INFO(do_trap_store_fault,
+ SIGSEGV, SEGV_ACCERR, "store (or AMO) access fault");
+DO_ERROR_INFO(do_trap_ecall_u,
+ SIGILL, ILL_ILLTRP, "environment call from U-mode");
+DO_ERROR_INFO(do_trap_ecall_s,
+ SIGILL, ILL_ILLTRP, "environment call from S-mode");
+DO_ERROR_INFO(do_trap_ecall_m,
+ SIGILL, ILL_ILLTRP, "environment call from M-mode");
+
+static inline unsigned long get_break_insn_length(unsigned long pc)
+{
+ bug_insn_t insn;
+
+ if (get_kernel_nofault(insn, (bug_insn_t *)pc))
+ return 0;
+
+ return GET_INSN_LENGTH(insn);
+}
+
+asmlinkage __visible __trap_section void do_trap_break(struct pt_regs *regs)
+{
+#ifdef CONFIG_KPROBES
+ if (kprobe_single_step_handler(regs))
+ return;
+
+ if (kprobe_breakpoint_handler(regs))
+ return;
+#endif
+#ifdef CONFIG_UPROBES
+ if (uprobe_single_step_handler(regs))
+ return;
+
+ if (uprobe_breakpoint_handler(regs))
+ return;
+#endif
+ current->thread.bad_cause = regs->cause;
+
+ if (user_mode(regs))
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->epc);
+#ifdef CONFIG_KGDB
+ else if (notify_die(DIE_TRAP, "EBREAK", regs, 0, regs->cause, SIGTRAP)
+ == NOTIFY_STOP)
+ return;
+#endif
+ else if (report_bug(regs->epc, regs) == BUG_TRAP_TYPE_WARN)
+ regs->epc += get_break_insn_length(regs->epc);
+ else
+ die(regs, "Kernel BUG");
+}
+NOKPROBE_SYMBOL(do_trap_break);
+
+#ifdef CONFIG_GENERIC_BUG
+int is_valid_bugaddr(unsigned long pc)
+{
+ bug_insn_t insn;
+
+ if (pc < VMALLOC_START)
+ return 0;
+ if (get_kernel_nofault(insn, (bug_insn_t *)pc))
+ return 0;
+ if ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32)
+ return (insn == __BUG_INSN_32);
+ else
+ return ((insn & __COMPRESSED_INSN_MASK) == __BUG_INSN_16);
+}
+#endif /* CONFIG_GENERIC_BUG */
+
+#ifdef CONFIG_VMAP_STACK
+static DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)],
+ overflow_stack)__aligned(16);
+/*
+ * shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used
+ * to get per-cpu overflow stack(get_overflow_stack).
+ */
+long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)] __aligned(16);
+asmlinkage unsigned long get_overflow_stack(void)
+{
+ return (unsigned long)this_cpu_ptr(overflow_stack) +
+ OVERFLOW_STACK_SIZE;
+}
+
+/*
+ * A pseudo spinlock to protect the shadow stack from being used by multiple
+ * harts concurrently. This isn't a real spinlock because the lock side must
+ * be taken without a valid stack and only a single register, it's only taken
+ * while in the process of panicing anyway so the performance and error
+ * checking a proper spinlock gives us doesn't matter.
+ */
+unsigned long spin_shadow_stack;
+
+asmlinkage void handle_bad_stack(struct pt_regs *regs)
+{
+ unsigned long tsk_stk = (unsigned long)current->stack;
+ unsigned long ovf_stk = (unsigned long)this_cpu_ptr(overflow_stack);
+
+ /*
+ * We're done with the shadow stack by this point, as we're on the
+ * overflow stack. Tell any other concurrent overflowing harts that
+ * they can proceed with panicing by releasing the pseudo-spinlock.
+ *
+ * This pairs with an amoswap.aq in handle_kernel_stack_overflow.
+ */
+ smp_store_release(&spin_shadow_stack, 0);
+
+ console_verbose();
+
+ pr_emerg("Insufficient stack space to handle exception!\n");
+ pr_emerg("Task stack: [0x%016lx..0x%016lx]\n",
+ tsk_stk, tsk_stk + THREAD_SIZE);
+ pr_emerg("Overflow stack: [0x%016lx..0x%016lx]\n",
+ ovf_stk, ovf_stk + OVERFLOW_STACK_SIZE);
+
+ __show_regs(regs);
+ panic("Kernel stack overflow");
+
+ for (;;)
+ wait_for_interrupt();
+}
+#endif
diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
new file mode 100644
index 000000000..5348d842c
--- /dev/null
+++ b/arch/riscv/kernel/traps_misaligned.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/stringify.h>
+
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/csr.h>
+
+#define INSN_MATCH_LB 0x3
+#define INSN_MASK_LB 0x707f
+#define INSN_MATCH_LH 0x1003
+#define INSN_MASK_LH 0x707f
+#define INSN_MATCH_LW 0x2003
+#define INSN_MASK_LW 0x707f
+#define INSN_MATCH_LD 0x3003
+#define INSN_MASK_LD 0x707f
+#define INSN_MATCH_LBU 0x4003
+#define INSN_MASK_LBU 0x707f
+#define INSN_MATCH_LHU 0x5003
+#define INSN_MASK_LHU 0x707f
+#define INSN_MATCH_LWU 0x6003
+#define INSN_MASK_LWU 0x707f
+#define INSN_MATCH_SB 0x23
+#define INSN_MASK_SB 0x707f
+#define INSN_MATCH_SH 0x1023
+#define INSN_MASK_SH 0x707f
+#define INSN_MATCH_SW 0x2023
+#define INSN_MASK_SW 0x707f
+#define INSN_MATCH_SD 0x3023
+#define INSN_MASK_SD 0x707f
+
+#define INSN_MATCH_FLW 0x2007
+#define INSN_MASK_FLW 0x707f
+#define INSN_MATCH_FLD 0x3007
+#define INSN_MASK_FLD 0x707f
+#define INSN_MATCH_FLQ 0x4007
+#define INSN_MASK_FLQ 0x707f
+#define INSN_MATCH_FSW 0x2027
+#define INSN_MASK_FSW 0x707f
+#define INSN_MATCH_FSD 0x3027
+#define INSN_MASK_FSD 0x707f
+#define INSN_MATCH_FSQ 0x4027
+#define INSN_MASK_FSQ 0x707f
+
+#define INSN_MATCH_C_LD 0x6000
+#define INSN_MASK_C_LD 0xe003
+#define INSN_MATCH_C_SD 0xe000
+#define INSN_MASK_C_SD 0xe003
+#define INSN_MATCH_C_LW 0x4000
+#define INSN_MASK_C_LW 0xe003
+#define INSN_MATCH_C_SW 0xc000
+#define INSN_MASK_C_SW 0xe003
+#define INSN_MATCH_C_LDSP 0x6002
+#define INSN_MASK_C_LDSP 0xe003
+#define INSN_MATCH_C_SDSP 0xe002
+#define INSN_MASK_C_SDSP 0xe003
+#define INSN_MATCH_C_LWSP 0x4002
+#define INSN_MASK_C_LWSP 0xe003
+#define INSN_MATCH_C_SWSP 0xc002
+#define INSN_MASK_C_SWSP 0xe003
+
+#define INSN_MATCH_C_FLD 0x2000
+#define INSN_MASK_C_FLD 0xe003
+#define INSN_MATCH_C_FLW 0x6000
+#define INSN_MASK_C_FLW 0xe003
+#define INSN_MATCH_C_FSD 0xa000
+#define INSN_MASK_C_FSD 0xe003
+#define INSN_MATCH_C_FSW 0xe000
+#define INSN_MASK_C_FSW 0xe003
+#define INSN_MATCH_C_FLDSP 0x2002
+#define INSN_MASK_C_FLDSP 0xe003
+#define INSN_MATCH_C_FSDSP 0xa002
+#define INSN_MASK_C_FSDSP 0xe003
+#define INSN_MATCH_C_FLWSP 0x6002
+#define INSN_MASK_C_FLWSP 0xe003
+#define INSN_MATCH_C_FSWSP 0xe002
+#define INSN_MASK_C_FSWSP 0xe003
+
+#define INSN_LEN(insn) ((((insn) & 0x3) < 0x3) ? 2 : 4)
+
+#if defined(CONFIG_64BIT)
+#define LOG_REGBYTES 3
+#define XLEN 64
+#else
+#define LOG_REGBYTES 2
+#define XLEN 32
+#endif
+#define REGBYTES (1 << LOG_REGBYTES)
+#define XLEN_MINUS_16 ((XLEN) - 16)
+
+#define SH_RD 7
+#define SH_RS1 15
+#define SH_RS2 20
+#define SH_RS2C 2
+
+#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
+#define RVC_LW_IMM(x) ((RV_X(x, 6, 1) << 2) | \
+ (RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 5, 1) << 6))
+#define RVC_LD_IMM(x) ((RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 5, 2) << 6))
+#define RVC_LWSP_IMM(x) ((RV_X(x, 4, 3) << 2) | \
+ (RV_X(x, 12, 1) << 5) | \
+ (RV_X(x, 2, 2) << 6))
+#define RVC_LDSP_IMM(x) ((RV_X(x, 5, 2) << 3) | \
+ (RV_X(x, 12, 1) << 5) | \
+ (RV_X(x, 2, 3) << 6))
+#define RVC_SWSP_IMM(x) ((RV_X(x, 9, 4) << 2) | \
+ (RV_X(x, 7, 2) << 6))
+#define RVC_SDSP_IMM(x) ((RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 7, 3) << 6))
+#define RVC_RS1S(insn) (8 + RV_X(insn, SH_RD, 3))
+#define RVC_RS2S(insn) (8 + RV_X(insn, SH_RS2C, 3))
+#define RVC_RS2(insn) RV_X(insn, SH_RS2C, 5)
+
+#define SHIFT_RIGHT(x, y) \
+ ((y) < 0 ? ((x) << -(y)) : ((x) >> (y)))
+
+#define REG_MASK \
+ ((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
+
+#define REG_OFFSET(insn, pos) \
+ (SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
+
+#define REG_PTR(insn, pos, regs) \
+ (ulong *)((ulong)(regs) + REG_OFFSET(insn, pos))
+
+#define GET_RM(insn) (((insn) >> 12) & 7)
+
+#define GET_RS1(insn, regs) (*REG_PTR(insn, SH_RS1, regs))
+#define GET_RS2(insn, regs) (*REG_PTR(insn, SH_RS2, regs))
+#define GET_RS1S(insn, regs) (*REG_PTR(RVC_RS1S(insn), 0, regs))
+#define GET_RS2S(insn, regs) (*REG_PTR(RVC_RS2S(insn), 0, regs))
+#define GET_RS2C(insn, regs) (*REG_PTR(insn, SH_RS2C, regs))
+#define GET_SP(regs) (*REG_PTR(2, 0, regs))
+#define SET_RD(insn, regs, val) (*REG_PTR(insn, SH_RD, regs) = (val))
+#define IMM_I(insn) ((s32)(insn) >> 20)
+#define IMM_S(insn) (((s32)(insn) >> 25 << 5) | \
+ (s32)(((insn) >> 7) & 0x1f))
+#define MASK_FUNCT3 0x7000
+
+#define GET_PRECISION(insn) (((insn) >> 25) & 3)
+#define GET_RM(insn) (((insn) >> 12) & 7)
+#define PRECISION_S 0
+#define PRECISION_D 1
+
+#define DECLARE_UNPRIVILEGED_LOAD_FUNCTION(type, insn) \
+static inline type load_##type(const type *addr) \
+{ \
+ type val; \
+ asm (#insn " %0, %1" \
+ : "=&r" (val) : "m" (*addr)); \
+ return val; \
+}
+
+#define DECLARE_UNPRIVILEGED_STORE_FUNCTION(type, insn) \
+static inline void store_##type(type *addr, type val) \
+{ \
+ asm volatile (#insn " %0, %1\n" \
+ : : "r" (val), "m" (*addr)); \
+}
+
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u8, lbu)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u16, lhu)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s8, lb)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s16, lh)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(s32, lw)
+DECLARE_UNPRIVILEGED_STORE_FUNCTION(u8, sb)
+DECLARE_UNPRIVILEGED_STORE_FUNCTION(u16, sh)
+DECLARE_UNPRIVILEGED_STORE_FUNCTION(u32, sw)
+#if defined(CONFIG_64BIT)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u32, lwu)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u64, ld)
+DECLARE_UNPRIVILEGED_STORE_FUNCTION(u64, sd)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(ulong, ld)
+#else
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(u32, lw)
+DECLARE_UNPRIVILEGED_LOAD_FUNCTION(ulong, lw)
+
+static inline u64 load_u64(const u64 *addr)
+{
+ return load_u32((u32 *)addr)
+ + ((u64)load_u32((u32 *)addr + 1) << 32);
+}
+
+static inline void store_u64(u64 *addr, u64 val)
+{
+ store_u32((u32 *)addr, val);
+ store_u32((u32 *)addr + 1, val >> 32);
+}
+#endif
+
+static inline ulong get_insn(ulong mepc)
+{
+ register ulong __mepc asm ("a2") = mepc;
+ ulong val, rvc_mask = 3, tmp;
+
+ asm ("and %[tmp], %[addr], 2\n"
+ "bnez %[tmp], 1f\n"
+#if defined(CONFIG_64BIT)
+ __stringify(LWU) " %[insn], (%[addr])\n"
+#else
+ __stringify(LW) " %[insn], (%[addr])\n"
+#endif
+ "and %[tmp], %[insn], %[rvc_mask]\n"
+ "beq %[tmp], %[rvc_mask], 2f\n"
+ "sll %[insn], %[insn], %[xlen_minus_16]\n"
+ "srl %[insn], %[insn], %[xlen_minus_16]\n"
+ "j 2f\n"
+ "1:\n"
+ "lhu %[insn], (%[addr])\n"
+ "and %[tmp], %[insn], %[rvc_mask]\n"
+ "bne %[tmp], %[rvc_mask], 2f\n"
+ "lhu %[tmp], 2(%[addr])\n"
+ "sll %[tmp], %[tmp], 16\n"
+ "add %[insn], %[insn], %[tmp]\n"
+ "2:"
+ : [insn] "=&r" (val), [tmp] "=&r" (tmp)
+ : [addr] "r" (__mepc), [rvc_mask] "r" (rvc_mask),
+ [xlen_minus_16] "i" (XLEN_MINUS_16));
+
+ return val;
+}
+
+union reg_data {
+ u8 data_bytes[8];
+ ulong data_ulong;
+ u64 data_u64;
+};
+
+int handle_misaligned_load(struct pt_regs *regs)
+{
+ union reg_data val;
+ unsigned long epc = regs->epc;
+ unsigned long insn = get_insn(epc);
+ unsigned long addr = csr_read(mtval);
+ int i, fp = 0, shift = 0, len = 0;
+
+ regs->epc = 0;
+
+ if ((insn & INSN_MASK_LW) == INSN_MATCH_LW) {
+ len = 4;
+ shift = 8 * (sizeof(unsigned long) - len);
+#if defined(CONFIG_64BIT)
+ } else if ((insn & INSN_MASK_LD) == INSN_MATCH_LD) {
+ len = 8;
+ shift = 8 * (sizeof(unsigned long) - len);
+ } else if ((insn & INSN_MASK_LWU) == INSN_MATCH_LWU) {
+ len = 4;
+#endif
+ } else if ((insn & INSN_MASK_FLD) == INSN_MATCH_FLD) {
+ fp = 1;
+ len = 8;
+ } else if ((insn & INSN_MASK_FLW) == INSN_MATCH_FLW) {
+ fp = 1;
+ len = 4;
+ } else if ((insn & INSN_MASK_LH) == INSN_MATCH_LH) {
+ len = 2;
+ shift = 8 * (sizeof(unsigned long) - len);
+ } else if ((insn & INSN_MASK_LHU) == INSN_MATCH_LHU) {
+ len = 2;
+#if defined(CONFIG_64BIT)
+ } else if ((insn & INSN_MASK_C_LD) == INSN_MATCH_C_LD) {
+ len = 8;
+ shift = 8 * (sizeof(unsigned long) - len);
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_LDSP) == INSN_MATCH_C_LDSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 8;
+ shift = 8 * (sizeof(unsigned long) - len);
+#endif
+ } else if ((insn & INSN_MASK_C_LW) == INSN_MATCH_C_LW) {
+ len = 4;
+ shift = 8 * (sizeof(unsigned long) - len);
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_LWSP) == INSN_MATCH_C_LWSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 4;
+ shift = 8 * (sizeof(unsigned long) - len);
+ } else if ((insn & INSN_MASK_C_FLD) == INSN_MATCH_C_FLD) {
+ fp = 1;
+ len = 8;
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_FLDSP) == INSN_MATCH_C_FLDSP) {
+ fp = 1;
+ len = 8;
+#if defined(CONFIG_32BIT)
+ } else if ((insn & INSN_MASK_C_FLW) == INSN_MATCH_C_FLW) {
+ fp = 1;
+ len = 4;
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_FLWSP) == INSN_MATCH_C_FLWSP) {
+ fp = 1;
+ len = 4;
+#endif
+ } else {
+ regs->epc = epc;
+ return -1;
+ }
+
+ val.data_u64 = 0;
+ for (i = 0; i < len; i++)
+ val.data_bytes[i] = load_u8((void *)(addr + i));
+
+ if (fp)
+ return -1;
+ SET_RD(insn, regs, val.data_ulong << shift >> shift);
+
+ regs->epc = epc + INSN_LEN(insn);
+
+ return 0;
+}
+
+int handle_misaligned_store(struct pt_regs *regs)
+{
+ union reg_data val;
+ unsigned long epc = regs->epc;
+ unsigned long insn = get_insn(epc);
+ unsigned long addr = csr_read(mtval);
+ int i, len = 0;
+
+ regs->epc = 0;
+
+ val.data_ulong = GET_RS2(insn, regs);
+
+ if ((insn & INSN_MASK_SW) == INSN_MATCH_SW) {
+ len = 4;
+#if defined(CONFIG_64BIT)
+ } else if ((insn & INSN_MASK_SD) == INSN_MATCH_SD) {
+ len = 8;
+#endif
+ } else if ((insn & INSN_MASK_SH) == INSN_MATCH_SH) {
+ len = 2;
+#if defined(CONFIG_64BIT)
+ } else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
+ len = 8;
+ val.data_ulong = GET_RS2S(insn, regs);
+ } else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP) {
+ len = 8;
+ val.data_ulong = GET_RS2C(insn, regs);
+#endif
+ } else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
+ len = 4;
+ val.data_ulong = GET_RS2S(insn, regs);
+ } else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP) {
+ len = 4;
+ val.data_ulong = GET_RS2C(insn, regs);
+ } else {
+ regs->epc = epc;
+ return -1;
+ }
+
+ for (i = 0; i < len; i++)
+ store_u8((void *)(addr + i), val.data_bytes[i]);
+
+ regs->epc = epc + INSN_LEN(insn);
+
+ return 0;
+}
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
new file mode 100644
index 000000000..123d05255
--- /dev/null
+++ b/arch/riscv/kernel/vdso.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ * Copyright (C) 2012 ARM Limited
+ * Copyright (C) 2015 Regents of the University of California
+ */
+
+#include <linux/elf.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/binfmts.h>
+#include <linux/err.h>
+#include <asm/page.h>
+#include <asm/vdso.h>
+#include <linux/time_namespace.h>
+
+#ifdef CONFIG_GENERIC_TIME_VSYSCALL
+#include <vdso/datapage.h>
+#else
+struct vdso_data {
+};
+#endif
+
+extern char vdso_start[], vdso_end[];
+#ifdef CONFIG_COMPAT
+extern char compat_vdso_start[], compat_vdso_end[];
+#endif
+
+enum vvar_pages {
+ VVAR_DATA_PAGE_OFFSET,
+ VVAR_TIMENS_PAGE_OFFSET,
+ VVAR_NR_PAGES,
+};
+
+enum rv_vdso_map {
+ RV_VDSO_MAP_VVAR,
+ RV_VDSO_MAP_VDSO,
+};
+
+#define VVAR_SIZE (VVAR_NR_PAGES << PAGE_SHIFT)
+
+/*
+ * The vDSO data page.
+ */
+static union {
+ struct vdso_data data;
+ u8 page[PAGE_SIZE];
+} vdso_data_store __page_aligned_data;
+struct vdso_data *vdso_data = &vdso_data_store.data;
+
+struct __vdso_info {
+ const char *name;
+ const char *vdso_code_start;
+ const char *vdso_code_end;
+ unsigned long vdso_pages;
+ /* Data Mapping */
+ struct vm_special_mapping *dm;
+ /* Code Mapping */
+ struct vm_special_mapping *cm;
+};
+
+static struct __vdso_info vdso_info;
+#ifdef CONFIG_COMPAT
+static struct __vdso_info compat_vdso_info;
+#endif
+
+static int vdso_mremap(const struct vm_special_mapping *sm,
+ struct vm_area_struct *new_vma)
+{
+ current->mm->context.vdso = (void *)new_vma->vm_start;
+
+ return 0;
+}
+
+static void __init __vdso_init(struct __vdso_info *vdso_info)
+{
+ unsigned int i;
+ struct page **vdso_pagelist;
+ unsigned long pfn;
+
+ if (memcmp(vdso_info->vdso_code_start, "\177ELF", 4))
+ panic("vDSO is not a valid ELF object!\n");
+
+ vdso_info->vdso_pages = (
+ vdso_info->vdso_code_end -
+ vdso_info->vdso_code_start) >>
+ PAGE_SHIFT;
+
+ vdso_pagelist = kcalloc(vdso_info->vdso_pages,
+ sizeof(struct page *),
+ GFP_KERNEL);
+ if (vdso_pagelist == NULL)
+ panic("vDSO kcalloc failed!\n");
+
+ /* Grab the vDSO code pages. */
+ pfn = sym_to_pfn(vdso_info->vdso_code_start);
+
+ for (i = 0; i < vdso_info->vdso_pages; i++)
+ vdso_pagelist[i] = pfn_to_page(pfn + i);
+
+ vdso_info->cm->pages = vdso_pagelist;
+}
+
+#ifdef CONFIG_TIME_NS
+struct vdso_data *arch_get_vdso_data(void *vvar_page)
+{
+ return (struct vdso_data *)(vvar_page);
+}
+
+/*
+ * The vvar mapping contains data for a specific time namespace, so when a task
+ * changes namespace we must unmap its vvar data for the old namespace.
+ * Subsequent faults will map in data for the new namespace.
+ *
+ * For more details see timens_setup_vdso_data().
+ */
+int vdso_join_timens(struct task_struct *task, struct time_namespace *ns)
+{
+ struct mm_struct *mm = task->mm;
+ struct vm_area_struct *vma;
+ VMA_ITERATOR(vmi, mm, 0);
+
+ mmap_read_lock(mm);
+
+ for_each_vma(vmi, vma) {
+ unsigned long size = vma->vm_end - vma->vm_start;
+
+ if (vma_is_special_mapping(vma, vdso_info.dm))
+ zap_page_range(vma, vma->vm_start, size);
+#ifdef CONFIG_COMPAT
+ if (vma_is_special_mapping(vma, compat_vdso_info.dm))
+ zap_page_range(vma, vma->vm_start, size);
+#endif
+ }
+
+ mmap_read_unlock(mm);
+ return 0;
+}
+
+static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
+{
+ if (likely(vma->vm_mm == current->mm))
+ return current->nsproxy->time_ns->vvar_page;
+
+ /*
+ * VM_PFNMAP | VM_IO protect .fault() handler from being called
+ * through interfaces like /proc/$pid/mem or
+ * process_vm_{readv,writev}() as long as there's no .access()
+ * in special_mapping_vmops.
+ * For more details check_vma_flags() and __access_remote_vm()
+ */
+ WARN(1, "vvar_page accessed remotely");
+
+ return NULL;
+}
+#else
+static struct page *find_timens_vvar_page(struct vm_area_struct *vma)
+{
+ return NULL;
+}
+#endif
+
+static vm_fault_t vvar_fault(const struct vm_special_mapping *sm,
+ struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct page *timens_page = find_timens_vvar_page(vma);
+ unsigned long pfn;
+
+ switch (vmf->pgoff) {
+ case VVAR_DATA_PAGE_OFFSET:
+ if (timens_page)
+ pfn = page_to_pfn(timens_page);
+ else
+ pfn = sym_to_pfn(vdso_data);
+ break;
+#ifdef CONFIG_TIME_NS
+ case VVAR_TIMENS_PAGE_OFFSET:
+ /*
+ * If a task belongs to a time namespace then a namespace
+ * specific VVAR is mapped with the VVAR_DATA_PAGE_OFFSET and
+ * the real VVAR page is mapped with the VVAR_TIMENS_PAGE_OFFSET
+ * offset.
+ * See also the comment near timens_setup_vdso_data().
+ */
+ if (!timens_page)
+ return VM_FAULT_SIGBUS;
+ pfn = sym_to_pfn(vdso_data);
+ break;
+#endif /* CONFIG_TIME_NS */
+ default:
+ return VM_FAULT_SIGBUS;
+ }
+
+ return vmf_insert_pfn(vma, vmf->address, pfn);
+}
+
+static struct vm_special_mapping rv_vdso_maps[] __ro_after_init = {
+ [RV_VDSO_MAP_VVAR] = {
+ .name = "[vvar]",
+ .fault = vvar_fault,
+ },
+ [RV_VDSO_MAP_VDSO] = {
+ .name = "[vdso]",
+ .mremap = vdso_mremap,
+ },
+};
+
+static struct __vdso_info vdso_info __ro_after_init = {
+ .name = "vdso",
+ .vdso_code_start = vdso_start,
+ .vdso_code_end = vdso_end,
+ .dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
+ .cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
+};
+
+#ifdef CONFIG_COMPAT
+static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
+ [RV_VDSO_MAP_VVAR] = {
+ .name = "[vvar]",
+ .fault = vvar_fault,
+ },
+ [RV_VDSO_MAP_VDSO] = {
+ .name = "[vdso]",
+ .mremap = vdso_mremap,
+ },
+};
+
+static struct __vdso_info compat_vdso_info __ro_after_init = {
+ .name = "compat_vdso",
+ .vdso_code_start = compat_vdso_start,
+ .vdso_code_end = compat_vdso_end,
+ .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
+ .cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
+};
+#endif
+
+static int __init vdso_init(void)
+{
+ __vdso_init(&vdso_info);
+#ifdef CONFIG_COMPAT
+ __vdso_init(&compat_vdso_info);
+#endif
+
+ return 0;
+}
+arch_initcall(vdso_init);
+
+static int __setup_additional_pages(struct mm_struct *mm,
+ struct linux_binprm *bprm,
+ int uses_interp,
+ struct __vdso_info *vdso_info)
+{
+ unsigned long vdso_base, vdso_text_len, vdso_mapping_len;
+ void *ret;
+
+ BUILD_BUG_ON(VVAR_NR_PAGES != __VVAR_PAGES);
+
+ vdso_text_len = vdso_info->vdso_pages << PAGE_SHIFT;
+ /* Be sure to map the data page */
+ vdso_mapping_len = vdso_text_len + VVAR_SIZE;
+
+ vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
+ if (IS_ERR_VALUE(vdso_base)) {
+ ret = ERR_PTR(vdso_base);
+ goto up_fail;
+ }
+
+ ret = _install_special_mapping(mm, vdso_base, VVAR_SIZE,
+ (VM_READ | VM_MAYREAD | VM_PFNMAP), vdso_info->dm);
+ if (IS_ERR(ret))
+ goto up_fail;
+
+ vdso_base += VVAR_SIZE;
+ mm->context.vdso = (void *)vdso_base;
+
+ ret =
+ _install_special_mapping(mm, vdso_base, vdso_text_len,
+ (VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC),
+ vdso_info->cm);
+
+ if (IS_ERR(ret))
+ goto up_fail;
+
+ return 0;
+
+up_fail:
+ mm->context.vdso = NULL;
+ return PTR_ERR(ret);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
+ int uses_interp)
+{
+ struct mm_struct *mm = current->mm;
+ int ret;
+
+ if (mmap_write_lock_killable(mm))
+ return -EINTR;
+
+ ret = __setup_additional_pages(mm, bprm, uses_interp,
+ &compat_vdso_info);
+ mmap_write_unlock(mm);
+
+ return ret;
+}
+#endif
+
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ struct mm_struct *mm = current->mm;
+ int ret;
+
+ if (mmap_write_lock_killable(mm))
+ return -EINTR;
+
+ ret = __setup_additional_pages(mm, bprm, uses_interp, &vdso_info);
+ mmap_write_unlock(mm);
+
+ return ret;
+}
diff --git a/arch/riscv/kernel/vdso/.gitignore b/arch/riscv/kernel/vdso/.gitignore
new file mode 100644
index 000000000..3a19def86
--- /dev/null
+++ b/arch/riscv/kernel/vdso/.gitignore
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+vdso.lds
+*.tmp
+vdso-syms.S
diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
new file mode 100644
index 000000000..06e6b27f3
--- /dev/null
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copied from arch/tile/kernel/vdso/Makefile
+
+# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
+# the inclusion of generic Makefile.
+ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT
+include $(srctree)/lib/vdso/Makefile
+# Symbols present in the vdso
+vdso-syms = rt_sigreturn
+ifdef CONFIG_64BIT
+vdso-syms += vgettimeofday
+endif
+vdso-syms += getcpu
+vdso-syms += flush_icache
+
+# Files to link into the vdso
+obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
+
+ccflags-y := -fno-stack-protector
+ccflags-y += -DDISABLE_BRANCH_PROFILING
+
+ifneq ($(c-gettimeofday-y),)
+ CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
+endif
+
+# Build rules
+targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds
+obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
+
+obj-y += vdso.o
+CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
+ifneq ($(filter vgettimeofday, $(vdso-syms)),)
+CPPFLAGS_vdso.lds += -DHAS_VGETTIMEOFDAY
+endif
+
+# Disable -pg to prevent insert call site
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE)
+
+# Disable profiling and instrumentation for VDSO code
+GCOV_PROFILE := n
+KCOV_INSTRUMENT := n
+KASAN_SANITIZE := n
+UBSAN_SANITIZE := n
+
+# Force dependency
+$(obj)/vdso.o: $(obj)/vdso.so
+
+# link rule for the .so file, .lds has to be first
+$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
+ $(call if_changed,vdsold)
+LDFLAGS_vdso.so.dbg = -shared -S -soname=linux-vdso.so.1 \
+ --build-id=sha1 --hash-style=both --eh-frame-hdr
+
+# strip rule for the .so file
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
+ $(call if_changed,vdsosym)
+
+# actual build commands
+# The DSO images are built using a special linker script
+# Make sure only to export the intended __vdso_xxx symbol offsets.
+quiet_cmd_vdsold = VDSOLD $@
+ cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
+ $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \
+ rm $@.tmp
+
+# install commands for the unstripped file
+quiet_cmd_vdso_install = INSTALL $@
+ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
+
+vdso.so: $(obj)/vdso.so.dbg
+ @mkdir -p $(MODLIB)/vdso
+ $(call cmd,vdso_install)
+
+vdso_install: vdso.so
diff --git a/arch/riscv/kernel/vdso/flush_icache.S b/arch/riscv/kernel/vdso/flush_icache.S
new file mode 100644
index 000000000..82f97d67c
--- /dev/null
+++ b/arch/riscv/kernel/vdso/flush_icache.S
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+ .text
+/* int __vdso_flush_icache(void *start, void *end, unsigned long flags); */
+ENTRY(__vdso_flush_icache)
+ .cfi_startproc
+#ifdef CONFIG_SMP
+ li a7, __NR_riscv_flush_icache
+ ecall
+#else
+ fence.i
+ li a0, 0
+#endif
+ ret
+ .cfi_endproc
+ENDPROC(__vdso_flush_icache)
diff --git a/arch/riscv/kernel/vdso/gen_vdso_offsets.sh b/arch/riscv/kernel/vdso/gen_vdso_offsets.sh
new file mode 100755
index 000000000..c2e5613f3
--- /dev/null
+++ b/arch/riscv/kernel/vdso/gen_vdso_offsets.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+LC_ALL=C
+sed -n -e 's/^[0]\+\(0[0-9a-fA-F]*\) . \(__vdso_[a-zA-Z0-9_]*\)$/\#define \2_offset\t0x\1/p'
diff --git a/arch/riscv/kernel/vdso/getcpu.S b/arch/riscv/kernel/vdso/getcpu.S
new file mode 100644
index 000000000..bb0c05e2f
--- /dev/null
+++ b/arch/riscv/kernel/vdso/getcpu.S
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017 SiFive
+ */
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+ .text
+/* int __vdso_getcpu(unsigned *cpu, unsigned *node, void *unused); */
+ENTRY(__vdso_getcpu)
+ .cfi_startproc
+ /* For now, just do the syscall. */
+ li a7, __NR_getcpu
+ ecall
+ ret
+ .cfi_endproc
+ENDPROC(__vdso_getcpu)
diff --git a/arch/riscv/kernel/vdso/note.S b/arch/riscv/kernel/vdso/note.S
new file mode 100644
index 000000000..2a956c942
--- /dev/null
+++ b/arch/riscv/kernel/vdso/note.S
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
+ * Here we can supply some information useful to userland.
+ */
+
+#include <linux/elfnote.h>
+#include <linux/version.h>
+
+ELFNOTE_START(Linux, 0, "a")
+ .long LINUX_VERSION_CODE
+ELFNOTE_END
diff --git a/arch/riscv/kernel/vdso/rt_sigreturn.S b/arch/riscv/kernel/vdso/rt_sigreturn.S
new file mode 100644
index 000000000..0573705ea
--- /dev/null
+++ b/arch/riscv/kernel/vdso/rt_sigreturn.S
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2014 Regents of the University of California
+ */
+
+#include <linux/linkage.h>
+#include <asm/unistd.h>
+
+ .text
+ENTRY(__vdso_rt_sigreturn)
+ .cfi_startproc
+ .cfi_signal_frame
+ li a7, __NR_rt_sigreturn
+ scall
+ .cfi_endproc
+ENDPROC(__vdso_rt_sigreturn)
diff --git a/arch/riscv/kernel/vdso/vdso.S b/arch/riscv/kernel/vdso/vdso.S
new file mode 100644
index 000000000..83f1c899e
--- /dev/null
+++ b/arch/riscv/kernel/vdso/vdso.S
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2014 Regents of the University of California
+ */
+
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+#ifndef __VDSO_PATH
+#define __VDSO_PATH "arch/riscv/kernel/vdso/vdso.so"
+#endif
+
+ __PAGE_ALIGNED_DATA
+
+ .globl vdso_start, vdso_end
+ .balign PAGE_SIZE
+vdso_start:
+ .incbin __VDSO_PATH
+ .balign PAGE_SIZE
+vdso_end:
+
+ .previous
diff --git a/arch/riscv/kernel/vdso/vdso.lds.S b/arch/riscv/kernel/vdso/vdso.lds.S
new file mode 100644
index 000000000..150b1a572
--- /dev/null
+++ b/arch/riscv/kernel/vdso/vdso.lds.S
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+#include <asm/page.h>
+#include <asm/vdso.h>
+
+OUTPUT_ARCH(riscv)
+
+SECTIONS
+{
+ PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE);
+#ifdef CONFIG_TIME_NS
+ PROVIDE(_timens_data = _vdso_data + PAGE_SIZE);
+#endif
+ . = SIZEOF_HEADERS;
+
+ .hash : { *(.hash) } :text
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+
+ .note : { *(.note.*) } :text :note
+ .dynamic : { *(.dynamic) } :text :dynamic
+
+ .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
+ .eh_frame : { KEEP (*(.eh_frame)) } :text
+
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+
+ /*
+ * This linker script is used both with -r and with -shared.
+ * For the layouts to match, we need to skip more than enough
+ * space for the dynamic symbol table, etc. If this amount is
+ * insufficient, ld -shared will error; simply increase it here.
+ */
+ . = 0x800;
+ .text : { *(.text .text.*) } :text
+
+ .data : {
+ *(.got.plt) *(.got)
+ *(.data .data.* .gnu.linkonce.d.*)
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ }
+}
+
+/*
+ * We must supply the ELF program headers explicitly to get just one
+ * PT_LOAD segment, and set the flags explicitly to make segments read-only.
+ */
+PHDRS
+{
+ text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+ note PT_NOTE FLAGS(4); /* PF_R */
+ eh_frame_hdr PT_GNU_EH_FRAME;
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+ LINUX_4.15 {
+ global:
+ __vdso_rt_sigreturn;
+#ifdef HAS_VGETTIMEOFDAY
+ __vdso_gettimeofday;
+ __vdso_clock_gettime;
+ __vdso_clock_getres;
+#endif
+ __vdso_getcpu;
+ __vdso_flush_icache;
+ local: *;
+ };
+}
diff --git a/arch/riscv/kernel/vdso/vgettimeofday.c b/arch/riscv/kernel/vdso/vgettimeofday.c
new file mode 100644
index 000000000..cc0d80699
--- /dev/null
+++ b/arch/riscv/kernel/vdso/vgettimeofday.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copied from arch/arm64/kernel/vdso/vgettimeofday.c
+ *
+ * Copyright (C) 2018 ARM Ltd.
+ * Copyright (C) 2020 SiFive
+ */
+
+#include <linux/time.h>
+#include <linux/types.h>
+
+extern
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
+{
+ return __cvdso_clock_gettime(clock, ts);
+}
+
+extern
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
+{
+ return __cvdso_gettimeofday(tv, tz);
+}
+
+extern
+int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res);
+int __vdso_clock_getres(clockid_t clock_id, struct __kernel_timespec *res)
+{
+ return __cvdso_clock_getres(clock_id, res);
+}
diff --git a/arch/riscv/kernel/vmlinux-xip.lds.S b/arch/riscv/kernel/vmlinux-xip.lds.S
new file mode 100644
index 000000000..24a2fdd3b
--- /dev/null
+++ b/arch/riscv/kernel/vmlinux-xip.lds.S
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ * Copyright (C) 2020 Vitaly Wool, Konsulko AB
+ */
+
+#include <asm/pgtable.h>
+#define LOAD_OFFSET KERNEL_LINK_ADDR
+/* No __ro_after_init data in the .rodata section - which will always be ro */
+#define RO_AFTER_INIT_DATA
+
+#include <asm/vmlinux.lds.h>
+#include <asm/page.h>
+#include <asm/cache.h>
+#include <asm/thread_info.h>
+
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+
+jiffies = jiffies_64;
+
+SECTIONS
+{
+ /* Beginning of code and text segment */
+ . = LOAD_OFFSET;
+ _xiprom = .;
+ _start = .;
+ HEAD_TEXT_SECTION
+ INIT_TEXT_SECTION(PAGE_SIZE)
+ /* we have to discard exit text and such at runtime, not link time */
+ __exittext_begin = .;
+ .exit.text :
+ {
+ EXIT_TEXT
+ }
+ __exittext_end = .;
+
+ .text : {
+ _text = .;
+ _stext = .;
+ TEXT_TEXT
+ SCHED_TEXT
+ CPUIDLE_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ ENTRY_TEXT
+ IRQENTRY_TEXT
+ SOFTIRQENTRY_TEXT
+ _etext = .;
+ }
+ RO_DATA(L1_CACHE_BYTES)
+ .srodata : {
+ *(.srodata*)
+ }
+ .init.rodata : {
+ INIT_SETUP(16)
+ INIT_CALLS
+ CON_INITCALL
+ INIT_RAM_FS
+ }
+ _exiprom = .; /* End of XIP ROM area */
+
+
+/*
+ * From this point, stuff is considered writable and will be copied to RAM
+ */
+ __data_loc = ALIGN(PAGE_SIZE); /* location in file */
+ . = KERNEL_LINK_ADDR + XIP_OFFSET; /* location in memory */
+
+#undef LOAD_OFFSET
+#define LOAD_OFFSET (KERNEL_LINK_ADDR + XIP_OFFSET - (__data_loc & XIP_OFFSET_MASK))
+
+ _sdata = .; /* Start of data section */
+ _data = .;
+ RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
+ _edata = .;
+ __start_ro_after_init = .;
+ .data.ro_after_init : AT(ADDR(.data.ro_after_init) - LOAD_OFFSET) {
+ *(.data..ro_after_init)
+ }
+ __end_ro_after_init = .;
+
+ . = ALIGN(PAGE_SIZE);
+ __init_begin = .;
+ .init.data : {
+ INIT_DATA
+ }
+ .exit.data : {
+ EXIT_DATA
+ }
+ . = ALIGN(8);
+ __soc_early_init_table : {
+ __soc_early_init_table_start = .;
+ KEEP(*(__soc_early_init_table))
+ __soc_early_init_table_end = .;
+ }
+ __soc_builtin_dtb_table : {
+ __soc_builtin_dtb_table_start = .;
+ KEEP(*(__soc_builtin_dtb_table))
+ __soc_builtin_dtb_table_end = .;
+ }
+
+ . = ALIGN(8);
+ .alternative : {
+ __alt_start = .;
+ *(.alternative)
+ __alt_end = .;
+ }
+ __init_end = .;
+
+ . = ALIGN(16);
+ .xip.traps : {
+ __xip_traps_start = .;
+ *(.xip.traps)
+ __xip_traps_end = .;
+ }
+
+ . = ALIGN(PAGE_SIZE);
+ .sdata : {
+ __global_pointer$ = . + 0x800;
+ *(.sdata*)
+ *(.sbss*)
+ }
+
+ BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
+
+ PERCPU_SECTION(L1_CACHE_BYTES)
+
+ .rel.dyn : AT(ADDR(.rel.dyn) - LOAD_OFFSET) {
+ *(.rel.dyn*)
+ }
+
+ /*
+ * End of copied data. We need a dummy section to get its LMA.
+ * Also located before final ALIGN() as trailing padding is not stored
+ * in the resulting binary file and useless to copy.
+ */
+ .data.endmark : AT(ADDR(.data.endmark) - LOAD_OFFSET) { }
+ _edata_loc = LOADADDR(.data.endmark);
+
+ . = ALIGN(PAGE_SIZE);
+ _end = .;
+
+ STABS_DEBUG
+ DWARF_DEBUG
+
+ DISCARDS
+}
diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
new file mode 100644
index 000000000..d478e063b
--- /dev/null
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ * Copyright (C) 2017 SiFive
+ */
+
+#define RO_EXCEPTION_TABLE_ALIGN 4
+
+#ifdef CONFIG_XIP_KERNEL
+#include "vmlinux-xip.lds.S"
+#else
+
+#include <asm/pgtable.h>
+#define LOAD_OFFSET KERNEL_LINK_ADDR
+
+#include <asm/vmlinux.lds.h>
+#include <asm/page.h>
+#include <asm/cache.h>
+#include <asm/thread_info.h>
+#include <asm/set_memory.h>
+#include "image-vars.h"
+
+#include <linux/sizes.h>
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+
+jiffies = jiffies_64;
+
+PECOFF_SECTION_ALIGNMENT = 0x1000;
+PECOFF_FILE_ALIGNMENT = 0x200;
+
+SECTIONS
+{
+ /* Beginning of code and text segment */
+ . = LOAD_OFFSET;
+ _start = .;
+ HEAD_TEXT_SECTION
+ . = ALIGN(PAGE_SIZE);
+
+ .text : {
+ _text = .;
+ _stext = .;
+ TEXT_TEXT
+ SCHED_TEXT
+ CPUIDLE_TEXT
+ LOCK_TEXT
+ KPROBES_TEXT
+ ENTRY_TEXT
+ IRQENTRY_TEXT
+ SOFTIRQENTRY_TEXT
+ _etext = .;
+ }
+
+ . = ALIGN(SECTION_ALIGN);
+ __init_begin = .;
+ __init_text_begin = .;
+ .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) ALIGN(SECTION_ALIGN) { \
+ _sinittext = .; \
+ INIT_TEXT \
+ _einittext = .; \
+ }
+
+ . = ALIGN(8);
+ __soc_early_init_table : {
+ __soc_early_init_table_start = .;
+ KEEP(*(__soc_early_init_table))
+ __soc_early_init_table_end = .;
+ }
+ __soc_builtin_dtb_table : {
+ __soc_builtin_dtb_table_start = .;
+ KEEP(*(__soc_builtin_dtb_table))
+ __soc_builtin_dtb_table_end = .;
+ }
+ /* we have to discard exit text and such at runtime, not link time */
+ __exittext_begin = .;
+ .exit.text :
+ {
+ EXIT_TEXT
+ }
+ __exittext_end = .;
+
+ __init_text_end = .;
+ . = ALIGN(SECTION_ALIGN);
+#ifdef CONFIG_EFI
+ . = ALIGN(PECOFF_SECTION_ALIGNMENT);
+ __pecoff_text_end = .;
+#endif
+ /* Start of init data section */
+ __init_data_begin = .;
+ INIT_DATA_SECTION(16)
+ .exit.data :
+ {
+ EXIT_DATA
+ }
+ PERCPU_SECTION(L1_CACHE_BYTES)
+
+ .rel.dyn : {
+ *(.rel.dyn*)
+ }
+
+ __init_data_end = .;
+
+ . = ALIGN(8);
+ .alternative : {
+ __alt_start = .;
+ *(.alternative)
+ __alt_end = .;
+ }
+ __init_end = .;
+
+ /* Start of data section */
+ _sdata = .;
+ RO_DATA(SECTION_ALIGN)
+ .srodata : {
+ *(.srodata*)
+ }
+
+ . = ALIGN(SECTION_ALIGN);
+ _data = .;
+
+ RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_ALIGN)
+ .sdata : {
+ __global_pointer$ = . + 0x800;
+ *(.sdata*)
+ }
+
+#ifdef CONFIG_EFI
+ .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
+ __pecoff_data_raw_size = ABSOLUTE(. - __pecoff_text_end);
+#endif
+
+ /* End of data section */
+ _edata = .;
+
+ BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0)
+
+#ifdef CONFIG_EFI
+ . = ALIGN(PECOFF_SECTION_ALIGNMENT);
+ __pecoff_data_virt_size = ABSOLUTE(. - __pecoff_text_end);
+#endif
+ _end = .;
+
+ STABS_DEBUG
+ DWARF_DEBUG
+ ELF_DETAILS
+
+ DISCARDS
+}
+#endif /* CONFIG_XIP_KERNEL */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 05:13:11 +0000