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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_X86_KPROBES_H
3#define _ASM_X86_KPROBES_H
4/*
5 * Kernel Probes (KProbes)
6 *
7 * Copyright (C) IBM Corporation, 2002, 2004
8 *
9 * See arch/x86/kernel/kprobes.c for x86 kprobes history.
10 */
11
12#include <asm-generic/kprobes.h>
13
14#ifdef CONFIG_KPROBES
15#include <linux/types.h>
16#include <linux/ptrace.h>
17#include <linux/percpu.h>
18#include <asm/text-patching.h>
19#include <asm/insn.h>
20
21#define __ARCH_WANT_KPROBES_INSN_SLOT
22
23struct pt_regs;
24struct kprobe;
25
26typedef u8 kprobe_opcode_t;
27
28#define MAX_STACK_SIZE 64
29#define CUR_STACK_SIZE(ADDR) \
30 (current_top_of_stack() - (unsigned long)(ADDR))
31#define MIN_STACK_SIZE(ADDR) \
32 (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \
33 MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR))
34
35#define flush_insn_slot(p) do { } while (0)
36
37/* optinsn template addresses */
38extern __visible kprobe_opcode_t optprobe_template_entry[];
39extern __visible kprobe_opcode_t optprobe_template_clac[];
40extern __visible kprobe_opcode_t optprobe_template_val[];
41extern __visible kprobe_opcode_t optprobe_template_call[];
42extern __visible kprobe_opcode_t optprobe_template_end[];
43#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + DISP32_SIZE)
44#define MAX_OPTINSN_SIZE \
45 (((unsigned long)optprobe_template_end - \
46 (unsigned long)optprobe_template_entry) + \
47 MAX_OPTIMIZED_LENGTH + JMP32_INSN_SIZE)
48
49extern const int kretprobe_blacklist_size;
50
51void arch_remove_kprobe(struct kprobe *p);
52
53extern void arch_kprobe_override_function(struct pt_regs *regs);
54
55/* Architecture specific copy of original instruction*/
56struct arch_specific_insn {
57 /* copy of the original instruction */
58 kprobe_opcode_t *insn;
59 /*
60 * boostable = 0: This instruction type is not boostable.
61 * boostable = 1: This instruction has been boosted: we have
62 * added a relative jump after the instruction copy in insn,
63 * so no single-step and fixup are needed (unless there's
64 * a post_handler).
65 */
66 unsigned boostable:1;
67 unsigned char size; /* The size of insn */
68 union {
69 unsigned char opcode;
70 struct {
71 unsigned char type;
72 } jcc;
73 struct {
74 unsigned char type;
75 unsigned char asize;
76 } loop;
77 struct {
78 unsigned char reg;
79 } indirect;
80 };
81 s32 rel32; /* relative offset must be s32, s16, or s8 */
82 void (*emulate_op)(struct kprobe *p, struct pt_regs *regs);
83 /* Number of bytes of text poked */
84 int tp_len;
85};
86
87struct arch_optimized_insn {
88 /* copy of the original instructions */
89 kprobe_opcode_t copied_insn[DISP32_SIZE];
90 /* detour code buffer */
91 kprobe_opcode_t *insn;
92 /* the size of instructions copied to detour code buffer */
93 size_t size;
94};
95
96/* Return true (!0) if optinsn is prepared for optimization. */
97static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
98{
99 return optinsn->size;
100}
101
102struct prev_kprobe {
103 struct kprobe *kp;
104 unsigned long status;
105 unsigned long old_flags;
106 unsigned long saved_flags;
107};
108
109/* per-cpu kprobe control block */
110struct kprobe_ctlblk {
111 unsigned long kprobe_status;
112 unsigned long kprobe_old_flags;
113 unsigned long kprobe_saved_flags;
114 struct prev_kprobe prev_kprobe;
115};
116
117extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
118extern int kprobe_exceptions_notify(struct notifier_block *self,
119 unsigned long val, void *data);
120extern int kprobe_int3_handler(struct pt_regs *regs);
121
122#else
123
124static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; }
125
126#endif /* CONFIG_KPROBES */
127#endif /* _ASM_X86_KPROBES_H */