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
23 struct pt_regs;
24 struct kprobe;
25
26 typedef 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 */
38 extern __visible kprobe_opcode_t optprobe_template_entry[];
39 extern __visible kprobe_opcode_t optprobe_template_clac[];
40 extern __visible kprobe_opcode_t optprobe_template_val[];
41 extern __visible kprobe_opcode_t optprobe_template_call[];
42 extern __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
49 extern const int kretprobe_blacklist_size;
50
51 void arch_remove_kprobe(struct kprobe *p);
52
53 /* Architecture specific copy of original instruction*/
54 struct arch_specific_insn {
55 /* copy of the original instruction */
56 kprobe_opcode_t *insn;
57 /*
58 * boostable = 0: This instruction type is not boostable.
59 * boostable = 1: This instruction has been boosted: we have
60 * added a relative jump after the instruction copy in insn,
61 * so no single-step and fixup are needed (unless there's
62 * a post_handler).
63 */
64 unsigned boostable:1;
65 unsigned char size; /* The size of insn */
66 union {
67 unsigned char opcode;
68 struct {
69 unsigned char type;
70 } jcc;
71 struct {
72 unsigned char type;
73 unsigned char asize;
74 } loop;
75 struct {
76 unsigned char reg;
77 } indirect;
78 };
79 s32 rel32; /* relative offset must be s32, s16, or s8 */
80 void (*emulate_op)(struct kprobe *p, struct pt_regs *regs);
81 /* Number of bytes of text poked */
82 int tp_len;
83 };
84
85 struct arch_optimized_insn {
86 /* copy of the original instructions */
87 kprobe_opcode_t copied_insn[DISP32_SIZE];
88 /* detour code buffer */
89 kprobe_opcode_t *insn;
90 /* the size of instructions copied to detour code buffer */
91 size_t size;
92 };
93
94 /* Return true (!0) if optinsn is prepared for optimization. */
95 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
96 {
97 return optinsn->size;
98 }
99
100 struct prev_kprobe {
101 struct kprobe *kp;
102 unsigned long status;
103 unsigned long old_flags;
104 unsigned long saved_flags;
105 };
106
107 /* per-cpu kprobe control block */
108 struct kprobe_ctlblk {
109 unsigned long kprobe_status;
110 unsigned long kprobe_old_flags;
111 unsigned long kprobe_saved_flags;
112 struct prev_kprobe prev_kprobe;
113 };
114
115 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
116 extern int kprobe_int3_handler(struct pt_regs *regs);
117
118 #else
119
120 static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; }
121
122 #endif /* CONFIG_KPROBES */
123 #endif /* _ASM_X86_KPROBES_H */
124
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