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1965aae3 PA |
1 | #ifndef _ASM_X86_KPROBES_H |
2 | #define _ASM_X86_KPROBES_H | |
d6be29b8 MH |
3 | /* |
4 | * Kernel Probes (KProbes) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | * Copyright (C) IBM Corporation, 2002, 2004 | |
21 | * | |
22 | * See arch/x86/kernel/kprobes.c for x86 kprobes history. | |
23 | */ | |
24 | #include <linux/types.h> | |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/percpu.h> | |
30a813ae | 27 | #include <asm/insn.h> |
d6be29b8 MH |
28 | |
29 | #define __ARCH_WANT_KPROBES_INSN_SLOT | |
e5253896 | 30 | #define ARCH_SUPPORTS_KPROBES_ON_FTRACE |
d6be29b8 MH |
31 | |
32 | struct pt_regs; | |
33 | struct kprobe; | |
34 | ||
35 | typedef u8 kprobe_opcode_t; | |
36 | #define BREAKPOINT_INSTRUCTION 0xcc | |
d498f763 | 37 | #define RELATIVEJUMP_OPCODE 0xe9 |
c0f7ac3a MH |
38 | #define RELATIVEJUMP_SIZE 5 |
39 | #define RELATIVECALL_OPCODE 0xe8 | |
40 | #define RELATIVE_ADDR_SIZE 4 | |
d6be29b8 | 41 | #define MAX_STACK_SIZE 64 |
864dfa13 JP |
42 | #define MIN_STACK_SIZE(ADDR) \ |
43 | (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ | |
44 | THREAD_SIZE - (unsigned long)(ADDR))) \ | |
45 | ? (MAX_STACK_SIZE) \ | |
46 | : (((unsigned long)current_thread_info()) + \ | |
47 | THREAD_SIZE - (unsigned long)(ADDR))) | |
d6be29b8 | 48 | |
d6be29b8 MH |
49 | #define flush_insn_slot(p) do { } while (0) |
50 | ||
c0f7ac3a | 51 | /* optinsn template addresses */ |
04bb591c AK |
52 | extern __visible kprobe_opcode_t optprobe_template_entry; |
53 | extern __visible kprobe_opcode_t optprobe_template_val; | |
54 | extern __visible kprobe_opcode_t optprobe_template_call; | |
55 | extern __visible kprobe_opcode_t optprobe_template_end; | |
c0f7ac3a MH |
56 | #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) |
57 | #define MAX_OPTINSN_SIZE \ | |
58 | (((unsigned long)&optprobe_template_end - \ | |
59 | (unsigned long)&optprobe_template_entry) + \ | |
60 | MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) | |
61 | ||
d6be29b8 MH |
62 | extern const int kretprobe_blacklist_size; |
63 | ||
64 | void arch_remove_kprobe(struct kprobe *p); | |
04bb591c | 65 | asmlinkage void kretprobe_trampoline(void); |
d6be29b8 MH |
66 | |
67 | /* Architecture specific copy of original instruction*/ | |
68 | struct arch_specific_insn { | |
69 | /* copy of the original instruction */ | |
70 | kprobe_opcode_t *insn; | |
71 | /* | |
72 | * boostable = -1: This instruction type is not boostable. | |
73 | * boostable = 0: This instruction type is boostable. | |
74 | * boostable = 1: This instruction has been boosted: we have | |
75 | * added a relative jump after the instruction copy in insn, | |
76 | * so no single-step and fixup are needed (unless there's | |
77 | * a post_handler or break_handler). | |
78 | */ | |
79 | int boostable; | |
9a556ab9 | 80 | bool if_modifier; |
d6be29b8 MH |
81 | }; |
82 | ||
c0f7ac3a MH |
83 | struct arch_optimized_insn { |
84 | /* copy of the original instructions */ | |
85 | kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE]; | |
86 | /* detour code buffer */ | |
87 | kprobe_opcode_t *insn; | |
88 | /* the size of instructions copied to detour code buffer */ | |
89 | size_t size; | |
90 | }; | |
91 | ||
92 | /* Return true (!0) if optinsn is prepared for optimization. */ | |
93 | static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) | |
94 | { | |
95 | return optinsn->size; | |
96 | } | |
97 | ||
d6be29b8 MH |
98 | struct prev_kprobe { |
99 | struct kprobe *kp; | |
100 | unsigned long status; | |
101 | unsigned long old_flags; | |
102 | unsigned long saved_flags; | |
103 | }; | |
104 | ||
105 | /* per-cpu kprobe control block */ | |
106 | struct kprobe_ctlblk { | |
107 | unsigned long kprobe_status; | |
108 | unsigned long kprobe_old_flags; | |
109 | unsigned long kprobe_saved_flags; | |
110 | unsigned long *jprobe_saved_sp; | |
111 | struct pt_regs jprobe_saved_regs; | |
112 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; | |
113 | struct prev_kprobe prev_kprobe; | |
114 | }; | |
115 | ||
d6be29b8 MH |
116 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
117 | extern int kprobe_exceptions_notify(struct notifier_block *self, | |
118 | unsigned long val, void *data); | |
6f6343f5 MH |
119 | extern int kprobe_int3_handler(struct pt_regs *regs); |
120 | extern int kprobe_debug_handler(struct pt_regs *regs); | |
1965aae3 | 121 | #endif /* _ASM_X86_KPROBES_H */ |