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_exceptions_notify(struct notifier_block *self, |
117 | unsigned long val, void *data); |
118 | extern int kprobe_int3_handler(struct pt_regs *regs); |
119 | |
120 | #else |
121 | |
122 | static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } |
123 | |
124 | #endif /* CONFIG_KPROBES */ |
125 | #endif /* _ASM_X86_KPROBES_H */ |
126 | |