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 #include <linux/types.h>
25 #include <linux/ptrace.h>
26 #include <linux/percpu.h>
27
28 #define __ARCH_WANT_KPROBES_INSN_SLOT
29
30 struct pt_regs;
31 struct kprobe;
32
33 typedef u8 kprobe_opcode_t;
34 #define BREAKPOINT_INSTRUCTION 0xcc
35 #define RELATIVEJUMP_INSTRUCTION 0xe9
36 #define MAX_INSN_SIZE 16
37 #define MAX_STACK_SIZE 64
38 #define MIN_STACK_SIZE(ADDR) \
39 (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \
40 THREAD_SIZE - (unsigned long)(ADDR))) \
41 ? (MAX_STACK_SIZE) \
42 : (((unsigned long)current_thread_info()) + \
43 THREAD_SIZE - (unsigned long)(ADDR)))
44
45 #define flush_insn_slot(p) do { } while (0)
46
47 extern const int kretprobe_blacklist_size;
48
49 void arch_remove_kprobe(struct kprobe *p);
50 void kretprobe_trampoline(void);
51
52 /* Architecture specific copy of original instruction*/
53 struct arch_specific_insn {
54 /* copy of the original instruction */
55 kprobe_opcode_t *insn;
56 /*
57 * boostable = -1: This instruction type is not boostable.
58 * boostable = 0: This instruction type is 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 or break_handler).
63 */
64 int boostable;
65 };
66
67 struct prev_kprobe {
68 struct kprobe *kp;
69 unsigned long status;
70 unsigned long old_flags;
71 unsigned long saved_flags;
72 };
73
74 /* per-cpu kprobe control block */
75 struct kprobe_ctlblk {
76 unsigned long kprobe_status;
77 unsigned long kprobe_old_flags;
78 unsigned long kprobe_saved_flags;
79 unsigned long *jprobe_saved_sp;
80 struct pt_regs jprobe_saved_regs;
81 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
82 struct prev_kprobe prev_kprobe;
83 };
84
85 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
86 extern int kprobe_exceptions_notify(struct notifier_block *self,
87 unsigned long val, void *data);
88 #endif /* _ASM_X86_KPROBES_H */
89
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