1#ifndef _ASM_X86_KPROBES_H
2#define _ASM_X86_KPROBES_H
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
25#include <asm-generic/kprobes.h>
26
27#define BREAKPOINT_INSTRUCTION 0xcc
28
29#ifdef CONFIG_KPROBES
30#include <linux/types.h>
31#include <linux/ptrace.h>
32#include <linux/percpu.h>
33#include <asm/insn.h>
34
35#define __ARCH_WANT_KPROBES_INSN_SLOT
36
37struct pt_regs;
38struct kprobe;
39
40typedef u8 kprobe_opcode_t;
41#define RELATIVEJUMP_OPCODE 0xe9
42#define RELATIVEJUMP_SIZE 5
43#define RELATIVECALL_OPCODE 0xe8
44#define RELATIVE_ADDR_SIZE 4
45#define MAX_STACK_SIZE 64
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))
51
52#define flush_insn_slot(p) do { } while (0)
53
54/* optinsn template addresses */
55extern __visible kprobe_opcode_t optprobe_template_entry[];
56extern __visible kprobe_opcode_t optprobe_template_val[];
57extern __visible kprobe_opcode_t optprobe_template_call[];
58extern __visible kprobe_opcode_t optprobe_template_end[];
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
65extern const int kretprobe_blacklist_size;
66
67void arch_remove_kprobe(struct kprobe *p);
68asmlinkage void kretprobe_trampoline(void);
69
70extern void arch_kprobe_override_function(struct pt_regs *regs);
71
72/* Architecture specific copy of original instruction*/
73struct arch_specific_insn {
74 /* copy of the original instruction */
75 kprobe_opcode_t *insn;
76 /*
77 * boostable = false: This instruction type is not boostable.
78 * boostable = true: This instruction has been boosted: we have
79 * added a relative jump after the instruction copy in insn,
80 * so no single-step and fixup are needed (unless there's
81 * a post_handler).
82 */
83 bool boostable;
84 bool if_modifier;
85};
86
87struct arch_optimized_insn {
88 /* copy of the original instructions */
89 kprobe_opcode_t copied_insn[RELATIVE_ADDR_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);
121extern int kprobe_debug_handler(struct pt_regs *regs);
122
123#endif /* CONFIG_KPROBES */
124#endif /* _ASM_X86_KPROBES_H */
125