summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/ptrace.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/include/asm/ptrace.h
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/include/asm/ptrace.h')
-rw-r--r--arch/arm/include/asm/ptrace.h200
1 files changed, 200 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
new file mode 100644
index 0000000000..7f44e88d1f
--- /dev/null
+++ b/arch/arm/include/asm/ptrace.h
@@ -0,0 +1,200 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * arch/arm/include/asm/ptrace.h
+ *
+ * Copyright (C) 1996-2003 Russell King
+ */
+#ifndef __ASM_ARM_PTRACE_H
+#define __ASM_ARM_PTRACE_H
+
+#include <uapi/asm/ptrace.h>
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>
+
+struct pt_regs {
+ unsigned long uregs[18];
+};
+
+struct svc_pt_regs {
+ struct pt_regs regs;
+ u32 dacr;
+};
+
+#define to_svc_pt_regs(r) container_of(r, struct svc_pt_regs, regs)
+
+#define user_mode(regs) \
+ (((regs)->ARM_cpsr & 0xf) == 0)
+
+#ifdef CONFIG_ARM_THUMB
+#define thumb_mode(regs) \
+ (((regs)->ARM_cpsr & PSR_T_BIT))
+#else
+#define thumb_mode(regs) (0)
+#endif
+
+#ifndef CONFIG_CPU_V7M
+#define isa_mode(regs) \
+ ((((regs)->ARM_cpsr & PSR_J_BIT) >> (__ffs(PSR_J_BIT) - 1)) | \
+ (((regs)->ARM_cpsr & PSR_T_BIT) >> (__ffs(PSR_T_BIT))))
+#else
+#define isa_mode(regs) 1 /* Thumb */
+#endif
+
+#define processor_mode(regs) \
+ ((regs)->ARM_cpsr & MODE_MASK)
+
+#define interrupts_enabled(regs) \
+ (!((regs)->ARM_cpsr & PSR_I_BIT))
+
+#define fast_interrupts_enabled(regs) \
+ (!((regs)->ARM_cpsr & PSR_F_BIT))
+
+/* Are the current registers suitable for user mode?
+ * (used to maintain security in signal handlers)
+ */
+static inline int valid_user_regs(struct pt_regs *regs)
+{
+#ifndef CONFIG_CPU_V7M
+ unsigned long mode = regs->ARM_cpsr & MODE_MASK;
+
+ /*
+ * Always clear the F (FIQ) and A (delayed abort) bits
+ */
+ regs->ARM_cpsr &= ~(PSR_F_BIT | PSR_A_BIT);
+
+ if ((regs->ARM_cpsr & PSR_I_BIT) == 0) {
+ if (mode == USR_MODE)
+ return 1;
+ if (elf_hwcap & HWCAP_26BIT && mode == USR26_MODE)
+ return 1;
+ }
+
+ /*
+ * Force CPSR to something logical...
+ */
+ regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | PSR_T_BIT | MODE32_BIT;
+ if (!(elf_hwcap & HWCAP_26BIT))
+ regs->ARM_cpsr |= USR_MODE;
+
+ return 0;
+#else /* ifndef CONFIG_CPU_V7M */
+ return 1;
+#endif
+}
+
+static inline long regs_return_value(struct pt_regs *regs)
+{
+ return regs->ARM_r0;
+}
+
+#define instruction_pointer(regs) (regs)->ARM_pc
+
+#ifdef CONFIG_THUMB2_KERNEL
+#define frame_pointer(regs) (regs)->ARM_r7
+#else
+#define frame_pointer(regs) (regs)->ARM_fp
+#endif
+
+static inline void instruction_pointer_set(struct pt_regs *regs,
+ unsigned long val)
+{
+ instruction_pointer(regs) = val;
+}
+
+#ifdef CONFIG_SMP
+extern unsigned long profile_pc(struct pt_regs *regs);
+#else
+#define profile_pc(regs) instruction_pointer(regs)
+#endif
+
+#define predicate(x) ((x) & 0xf0000000)
+#define PREDICATE_ALWAYS 0xe0000000
+
+/*
+ * True if instr is a 32-bit thumb instruction. This works if instr
+ * is the first or only half-word of a thumb instruction. It also works
+ * when instr holds all 32-bits of a wide thumb instruction if stored
+ * in the form (first_half<<16)|(second_half)
+ */
+#define is_wide_instruction(instr) ((unsigned)(instr) >= 0xe800)
+
+/*
+ * kprobe-based event tracer support
+ */
+#include <linux/compiler.h>
+#define MAX_REG_OFFSET (offsetof(struct pt_regs, ARM_ORIG_r0))
+
+extern int regs_query_register_offset(const char *name);
+extern const char *regs_query_register_name(unsigned int offset);
+extern bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr);
+extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
+ unsigned int n);
+
+/**
+ * regs_get_register() - get register value from its offset
+ * @regs: pt_regs from which register value is gotten
+ * @offset: offset number of the register.
+ *
+ * regs_get_register returns the value of a register whose offset from @regs.
+ * The @offset is the offset of the register in struct pt_regs.
+ * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
+ */
+static inline unsigned long regs_get_register(struct pt_regs *regs,
+ unsigned int offset)
+{
+ if (unlikely(offset > MAX_REG_OFFSET))
+ return 0;
+ return *(unsigned long *)((unsigned long)regs + offset);
+}
+
+/* Valid only for Kernel mode traps. */
+static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
+{
+ return regs->ARM_sp;
+}
+
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+ return regs->ARM_sp;
+}
+
+#define current_pt_regs(void) ({ (struct pt_regs *) \
+ ((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
+})
+
+static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
+{
+ regs->ARM_r0 = rc;
+}
+
+/*
+ * Update ITSTATE after normal execution of an IT block instruction.
+ *
+ * The 8 IT state bits are split into two parts in CPSR:
+ * ITSTATE<1:0> are in CPSR<26:25>
+ * ITSTATE<7:2> are in CPSR<15:10>
+ */
+static inline unsigned long it_advance(unsigned long cpsr)
+{
+ if ((cpsr & 0x06000400) == 0) {
+ /* ITSTATE<2:0> == 0 means end of IT block, so clear IT state */
+ cpsr &= ~PSR_IT_MASK;
+ } else {
+ /* We need to shift left ITSTATE<4:0> */
+ const unsigned long mask = 0x06001c00; /* Mask ITSTATE<4:0> */
+ unsigned long it = cpsr & mask;
+ it <<= 1;
+ it |= it >> (27 - 10); /* Carry ITSTATE<2> to correct place */
+ it &= mask;
+ cpsr &= ~mask;
+ cpsr |= it;
+ }
+ return cpsr;
+}
+
+int syscall_trace_enter(struct pt_regs *regs);
+void syscall_trace_exit(struct pt_regs *regs);
+
+#endif /* __ASSEMBLY__ */
+#endif