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-rw-r--r--arch/mips/include/asm/thread_info.h197
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diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h
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+++ b/arch/mips/include/asm/thread_info.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/* thread_info.h: MIPS low-level thread information
+ *
+ * Copyright (C) 2002 David Howells (dhowells@redhat.com)
+ * - Incorporating suggestions made by Linus Torvalds and Dave Miller
+ */
+
+#ifndef _ASM_THREAD_INFO_H
+#define _ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+
+#ifndef __ASSEMBLY__
+
+#include <asm/processor.h>
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants
+ * must also be changed
+ */
+struct thread_info {
+ struct task_struct *task; /* main task structure */
+ unsigned long flags; /* low level flags */
+ unsigned long tp_value; /* thread pointer */
+ __u32 cpu; /* current CPU */
+ int preempt_count; /* 0 => preemptable, <0 => BUG */
+ struct pt_regs *regs;
+ long syscall; /* syscall number */
+};
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ */
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .task = &tsk, \
+ .flags = _TIF_FIXADE, \
+ .cpu = 0, \
+ .preempt_count = INIT_PREEMPT_COUNT, \
+}
+
+/*
+ * A pointer to the struct thread_info for the currently executing thread is
+ * held in register $28/$gp.
+ *
+ * We declare __current_thread_info as a global register variable rather than a
+ * local register variable within current_thread_info() because clang doesn't
+ * support explicit local register variables.
+ *
+ * When building the VDSO we take care not to declare the global register
+ * variable because this causes GCC to not preserve the value of $28/$gp in
+ * functions that change its value (which is common in the PIC VDSO when
+ * accessing the GOT). Since the VDSO shouldn't be accessing
+ * __current_thread_info anyway we declare it extern in order to cause a link
+ * failure if it's referenced.
+ */
+#ifdef __VDSO__
+extern struct thread_info *__current_thread_info;
+#else
+register struct thread_info *__current_thread_info __asm__("$28");
+#endif
+
+static inline struct thread_info *current_thread_info(void)
+{
+ return __current_thread_info;
+}
+
+#ifdef CONFIG_ARCH_HAS_CURRENT_STACK_POINTER
+register unsigned long current_stack_pointer __asm__("sp");
+#endif
+
+#endif /* !__ASSEMBLY__ */
+
+/* thread information allocation */
+#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_32BIT)
+#define THREAD_SIZE_ORDER (1)
+#endif
+#if defined(CONFIG_PAGE_SIZE_4KB) && defined(CONFIG_64BIT)
+#define THREAD_SIZE_ORDER (2)
+#endif
+#ifdef CONFIG_PAGE_SIZE_8KB
+#define THREAD_SIZE_ORDER (1)
+#endif
+#ifdef CONFIG_PAGE_SIZE_16KB
+#define THREAD_SIZE_ORDER (0)
+#endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define THREAD_SIZE_ORDER (0)
+#endif
+#ifdef CONFIG_PAGE_SIZE_64KB
+#define THREAD_SIZE_ORDER (0)
+#endif
+
+#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
+#define THREAD_MASK (THREAD_SIZE - 1UL)
+
+#define STACK_WARN (THREAD_SIZE / 8)
+
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files may need to
+ * access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ */
+#define TIF_SIGPENDING 1 /* signal pending */
+#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
+#define TIF_SYSCALL_AUDIT 3 /* syscall auditing active */
+#define TIF_SECCOMP 4 /* secure computing */
+#define TIF_NOTIFY_RESUME 5 /* callback before returning to user */
+#define TIF_UPROBE 6 /* breakpointed or singlestepping */
+#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
+#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal() */
+#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
+#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
+#define TIF_NOHZ 19 /* in adaptive nohz mode */
+#define TIF_FIXADE 20 /* Fix address errors in software */
+#define TIF_LOGADE 21 /* Log address errors to syslog */
+#define TIF_32BIT_REGS 22 /* 32-bit general purpose registers */
+#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
+#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
+#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
+#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
+#define TIF_32BIT_FPREGS 27 /* 32-bit floating point registers */
+#define TIF_HYBRID_FPREGS 28 /* 64b FP registers, odd singles in bits 63:32 of even doubles */
+#define TIF_USEDMSA 29 /* MSA has been used this quantum */
+#define TIF_MSA_CTX_LIVE 30 /* MSA context must be preserved */
+#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
+
+#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
+#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
+#define _TIF_SECCOMP (1<<TIF_SECCOMP)
+#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
+#define _TIF_UPROBE (1<<TIF_UPROBE)
+#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
+#define _TIF_USEDFPU (1<<TIF_USEDFPU)
+#define _TIF_NOHZ (1<<TIF_NOHZ)
+#define _TIF_FIXADE (1<<TIF_FIXADE)
+#define _TIF_LOGADE (1<<TIF_LOGADE)
+#define _TIF_32BIT_REGS (1<<TIF_32BIT_REGS)
+#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
+#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
+#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
+#define _TIF_32BIT_FPREGS (1<<TIF_32BIT_FPREGS)
+#define _TIF_HYBRID_FPREGS (1<<TIF_HYBRID_FPREGS)
+#define _TIF_USEDMSA (1<<TIF_USEDMSA)
+#define _TIF_MSA_CTX_LIVE (1<<TIF_MSA_CTX_LIVE)
+#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
+
+#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
+ _TIF_SYSCALL_AUDIT | \
+ _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
+
+/* work to do in syscall_trace_leave() */
+#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
+ _TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
+
+/* work to do on interrupt/exception return */
+#define _TIF_WORK_MASK \
+ (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME | \
+ _TIF_UPROBE | _TIF_NOTIFY_SIGNAL)
+/* work to do on any return to u-space */
+#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
+ _TIF_WORK_SYSCALL_EXIT | \
+ _TIF_SYSCALL_TRACEPOINT)
+
+/*
+ * We stash processor id into a COP0 register to retrieve it fast
+ * at kernel exception entry.
+ */
+#if defined(CONFIG_MIPS_PGD_C0_CONTEXT)
+#define SMP_CPUID_REG 20, 0 /* XCONTEXT */
+#define ASM_SMP_CPUID_REG $20
+#define SMP_CPUID_PTRSHIFT 48
+#else
+#define SMP_CPUID_REG 4, 0 /* CONTEXT */
+#define ASM_SMP_CPUID_REG $4
+#define SMP_CPUID_PTRSHIFT 23
+#endif
+
+#ifdef CONFIG_64BIT
+#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 3)
+#else
+#define SMP_CPUID_REGSHIFT (SMP_CPUID_PTRSHIFT + 2)
+#endif
+
+#define ASM_CPUID_MFC0 MFC0
+#define UASM_i_CPUID_MFC0 UASM_i_MFC0
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_THREAD_INFO_H */