arch/x86/include/asm/kprobes.h

Source file repositories/reference/linux-study-clean/arch/x86/include/asm/kprobes.h

File Facts

System
Linux kernel
Corpus path
arch/x86/include/asm/kprobes.h
Extension
.h
Size
3292 bytes
Lines
124
Domain
Architecture Layer
Bucket
arch/x86
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 arch_specific_insn {
	/* copy of the original instruction */
	kprobe_opcode_t *insn;
	/*
	 * boostable = 0: This instruction type is not boostable.
	 * boostable = 1: This instruction has been boosted: we have
	 * added a relative jump after the instruction copy in insn,
	 * so no single-step and fixup are needed (unless there's
	 * a post_handler).
	 */
	unsigned boostable:1;
	unsigned char size;	/* The size of insn */
	union {
		unsigned char opcode;
		struct {
			unsigned char type;
		} jcc;
		struct {
			unsigned char type;
			unsigned char asize;
		} loop;
		struct {
			unsigned char reg;
		} indirect;
	};
	s32 rel32;	/* relative offset must be s32, s16, or s8 */
	void (*emulate_op)(struct kprobe *p, struct pt_regs *regs);
	/* Number of bytes of text poked */
	int tp_len;
};

struct arch_optimized_insn {
	/* copy of the original instructions */
	kprobe_opcode_t copied_insn[DISP32_SIZE];
	/* detour code buffer */
	kprobe_opcode_t *insn;
	/* the size of instructions copied to detour code buffer */
	size_t size;
};

/* Return true (!0) if optinsn is prepared for optimization. */
static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
{
	return optinsn->size;
}

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
	unsigned long old_flags;
	unsigned long saved_flags;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_old_flags;
	unsigned long kprobe_saved_flags;
	struct prev_kprobe prev_kprobe;
};

extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_int3_handler(struct pt_regs *regs);

#else

static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; }

#endif /* CONFIG_KPROBES */
#endif /* _ASM_X86_KPROBES_H */

Annotation

Implementation Notes