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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Prasanna S Panchamukhi124d90b2006-02-24 13:04:08 -080030#define __ARCH_WANT_KPROBES_INSN_SLOT
31
32struct kprobe;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033struct pt_regs;
34
35typedef u8 kprobe_opcode_t;
36#define BREAKPOINT_INSTRUCTION 0xcc
37#define MAX_INSN_SIZE 16
38#define MAX_STACK_SIZE 64
39#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
40 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
41 ? (MAX_STACK_SIZE) \
42 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
43
44#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry
Hien Nguyenb94cce92005-06-23 00:09:19 -070045#define ARCH_SUPPORTS_KRETPROBES
46
Prasanna S Panchamukhi124d90b2006-02-24 13:04:08 -080047void arch_remove_kprobe(struct kprobe *p);
Hien Nguyenb94cce92005-06-23 00:09:19 -070048void kretprobe_trampoline(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50/* Architecture specific copy of original instruction*/
51struct arch_specific_insn {
52 /* copy of the original instruction */
Prasanna S Panchamukhi124d90b2006-02-24 13:04:08 -080053 kprobe_opcode_t *insn;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054};
55
Ananth N Mavinakayanahalli9a0e3a82005-11-07 01:00:08 -080056struct prev_kprobe {
57 struct kprobe *kp;
58 unsigned long status;
59 unsigned long old_eflags;
60 unsigned long saved_eflags;
61};
62
63/* per-cpu kprobe control block */
64struct kprobe_ctlblk {
65 unsigned long kprobe_status;
66 unsigned long kprobe_old_eflags;
67 unsigned long kprobe_saved_eflags;
68 long *jprobe_saved_esp;
69 struct pt_regs jprobe_saved_regs;
70 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
71 struct prev_kprobe prev_kprobe;
72};
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
75 * if necessary, before executing the original int3/1 (trap) handler.
76 */
77static inline void restore_interrupts(struct pt_regs *regs)
78{
79 if (regs->eflags & IF_MASK)
80 local_irq_enable();
81}
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083extern int kprobe_exceptions_notify(struct notifier_block *self,
84 unsigned long val, void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#endif /* _ASM_KPROBES_H */