arch/arm64/include/asm/ptrace.h

Source file repositories/reference/linux-study-clean/arch/arm64/include/asm/ptrace.h

File Facts

System
Linux kernel
Corpus path
arch/arm64/include/asm/ptrace.h
Extension
.h
Size
9532 bytes
Lines
366
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct pt_regs {
	union {
		struct user_pt_regs user_regs;
		struct {
			u64 regs[31];
			u64 sp;
			u64 pc;
			u64 pstate;
		};
	};
	u64 orig_x0;
	s32 syscallno;
	u32 pmr;

	u64 sdei_ttbr1;
	struct frame_record_meta stackframe;
};

/* For correct stack alignment, pt_regs has to be a multiple of 16 bytes. */
static_assert(IS_ALIGNED(sizeof(struct pt_regs), 16));

static inline bool in_syscall(struct pt_regs const *regs)
{
	return regs->syscallno != NO_SYSCALL;
}

static inline void forget_syscall(struct pt_regs *regs)
{
	regs->syscallno = NO_SYSCALL;
}

#define MAX_REG_OFFSET offsetof(struct pt_regs, pstate)

#define arch_has_single_step()	(1)

#ifdef CONFIG_COMPAT
#define compat_thumb_mode(regs) \
	(((regs)->pstate & PSR_AA32_T_BIT))
#else
#define compat_thumb_mode(regs) (0)
#endif

#define user_mode(regs)	\
	(((regs)->pstate & PSR_MODE_MASK) == PSR_MODE_EL0t)

#define compat_user_mode(regs)	\
	(((regs)->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK)) == \
	 (PSR_MODE32_BIT | PSR_MODE_EL0t))

#define processor_mode(regs) \
	((regs)->pstate & PSR_MODE_MASK)

#define irqs_priority_unmasked(regs)					\
	(system_uses_irq_prio_masking() ?				\
		(regs)->pmr == GIC_PRIO_IRQON :				\
		true)

static __always_inline bool regs_irqs_disabled(const struct pt_regs *regs)
{
	return (regs->pstate & PSR_I_BIT) || !irqs_priority_unmasked(regs);
}

#define interrupts_enabled(regs)	(!regs_irqs_disabled(regs))

static inline unsigned long user_stack_pointer(struct pt_regs *regs)
{
	if (compat_user_mode(regs))
		return regs->compat_sp;
	return regs->sp;
}

extern int regs_query_register_offset(const char *name);
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 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 u64 regs_get_register(struct pt_regs *regs, unsigned int offset)
{
	u64 val = 0;

	WARN_ON(offset & 7);

Annotation

Implementation Notes