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1da177e4 LT |
1 | #ifndef _ASM_KPROBES_H |
2 | #define _ASM_KPROBES_H | |
3 | /* | |
4 | * Kernel Probes (KProbes) | |
5 | * include/asm-i386/kprobes.h | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | * | |
21 | * Copyright (C) IBM Corporation, 2002, 2004 | |
22 | * | |
23 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
24 | * Probes initial implementation ( includes suggestions from | |
25 | * Rusty Russell). | |
26 | */ | |
27 | #include <linux/types.h> | |
28 | #include <linux/ptrace.h> | |
29 | ||
30 | struct pt_regs; | |
31 | ||
32 | typedef u8 kprobe_opcode_t; | |
33 | #define BREAKPOINT_INSTRUCTION 0xcc | |
34 | #define MAX_INSN_SIZE 16 | |
35 | #define MAX_STACK_SIZE 64 | |
36 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ | |
37 | (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ | |
38 | ? (MAX_STACK_SIZE) \ | |
39 | : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) | |
40 | ||
41 | #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry | |
b94cce92 HN |
42 | #define ARCH_SUPPORTS_KRETPROBES |
43 | ||
44 | void kretprobe_trampoline(void); | |
1da177e4 LT |
45 | |
46 | /* Architecture specific copy of original instruction*/ | |
47 | struct arch_specific_insn { | |
48 | /* copy of the original instruction */ | |
49 | kprobe_opcode_t insn[MAX_INSN_SIZE]; | |
50 | }; | |
51 | ||
52 | ||
53 | /* trap3/1 are intr gates for kprobes. So, restore the status of IF, | |
54 | * if necessary, before executing the original int3/1 (trap) handler. | |
55 | */ | |
56 | static inline void restore_interrupts(struct pt_regs *regs) | |
57 | { | |
58 | if (regs->eflags & IF_MASK) | |
59 | local_irq_enable(); | |
60 | } | |
61 | ||
62 | #ifdef CONFIG_KPROBES | |
63 | extern int kprobe_exceptions_notify(struct notifier_block *self, | |
64 | unsigned long val, void *data); | |
65 | #else /* !CONFIG_KPROBES */ | |
66 | static inline int kprobe_exceptions_notify(struct notifier_block *self, | |
67 | unsigned long val, void *data) | |
68 | { | |
69 | return 0; | |
70 | } | |
71 | #endif | |
72 | #endif /* _ASM_KPROBES_H */ |