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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 | */ | |
7d134b2c LR |
24 | |
25 | #include <asm-generic/kprobes.h> | |
26 | ||
27 | #define BREAKPOINT_INSTRUCTION 0xcc | |
28 | ||
29 | #ifdef CONFIG_KPROBES | |
d6be29b8 MH |
30 | #include <linux/types.h> |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/percpu.h> | |
30a813ae | 33 | #include <asm/insn.h> |
d6be29b8 MH |
34 | |
35 | #define __ARCH_WANT_KPROBES_INSN_SLOT | |
36 | ||
37 | struct pt_regs; | |
38 | struct kprobe; | |
39 | ||
40 | typedef u8 kprobe_opcode_t; | |
d498f763 | 41 | #define RELATIVEJUMP_OPCODE 0xe9 |
c0f7ac3a MH |
42 | #define RELATIVEJUMP_SIZE 5 |
43 | #define RELATIVECALL_OPCODE 0xe8 | |
44 | #define RELATIVE_ADDR_SIZE 4 | |
d6be29b8 | 45 | #define MAX_STACK_SIZE 64 |
aca9c293 LT |
46 | #define CUR_STACK_SIZE(ADDR) \ |
47 | (current_top_of_stack() - (unsigned long)(ADDR)) | |
48 | #define MIN_STACK_SIZE(ADDR) \ | |
49 | (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \ | |
50 | MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR)) | |
d6be29b8 | 51 | |
d6be29b8 MH |
52 | #define flush_insn_slot(p) do { } while (0) |
53 | ||
c0f7ac3a | 54 | /* optinsn template addresses */ |
54a7d50b LT |
55 | extern __visible kprobe_opcode_t optprobe_template_entry[]; |
56 | extern __visible kprobe_opcode_t optprobe_template_val[]; | |
57 | extern __visible kprobe_opcode_t optprobe_template_call[]; | |
58 | extern __visible kprobe_opcode_t optprobe_template_end[]; | |
c0f7ac3a MH |
59 | #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) |
60 | #define MAX_OPTINSN_SIZE \ | |
61 | (((unsigned long)&optprobe_template_end - \ | |
62 | (unsigned long)&optprobe_template_entry) + \ | |
63 | MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) | |
64 | ||
d6be29b8 MH |
65 | extern const int kretprobe_blacklist_size; |
66 | ||
67 | void arch_remove_kprobe(struct kprobe *p); | |
04bb591c | 68 | asmlinkage void kretprobe_trampoline(void); |
d6be29b8 MH |
69 | |
70 | /* Architecture specific copy of original instruction*/ | |
71 | struct arch_specific_insn { | |
72 | /* copy of the original instruction */ | |
73 | kprobe_opcode_t *insn; | |
74 | /* | |
490154bc MH |
75 | * boostable = false: This instruction type is not boostable. |
76 | * boostable = true: This instruction has been boosted: we have | |
d6be29b8 MH |
77 | * added a relative jump after the instruction copy in insn, |
78 | * so no single-step and fixup are needed (unless there's | |
79 | * a post_handler or break_handler). | |
80 | */ | |
490154bc | 81 | bool boostable; |
9a556ab9 | 82 | bool if_modifier; |
d6be29b8 MH |
83 | }; |
84 | ||
c0f7ac3a MH |
85 | struct arch_optimized_insn { |
86 | /* copy of the original instructions */ | |
87 | kprobe_opcode_t copied_insn[RELATIVE_ADDR_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 | ||
d6be29b8 MH |
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 | unsigned long *jprobe_saved_sp; | |
113 | struct pt_regs jprobe_saved_regs; | |
114 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; | |
115 | struct prev_kprobe prev_kprobe; | |
116 | }; | |
117 | ||
d6be29b8 MH |
118 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
119 | extern int kprobe_exceptions_notify(struct notifier_block *self, | |
120 | unsigned long val, void *data); | |
6f6343f5 MH |
121 | extern int kprobe_int3_handler(struct pt_regs *regs); |
122 | extern int kprobe_debug_handler(struct pt_regs *regs); | |
7d134b2c LR |
123 | |
124 | #endif /* CONFIG_KPROBES */ | |
1965aae3 | 125 | #endif /* _ASM_X86_KPROBES_H */ |