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Linux kernel mirror (for testing)
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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
30struct pt_regs;
31
32typedef 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
42#define ARCH_SUPPORTS_KRETPROBES
43#define arch_remove_kprobe(p) do {} while (0)
44
45void kretprobe_trampoline(void);
46
47/* Architecture specific copy of original instruction*/
48struct arch_specific_insn {
49 /* copy of the original instruction */
50 kprobe_opcode_t insn[MAX_INSN_SIZE];
51};
52
53struct prev_kprobe {
54 struct kprobe *kp;
55 unsigned long status;
56 unsigned long old_eflags;
57 unsigned long saved_eflags;
58};
59
60/* per-cpu kprobe control block */
61struct kprobe_ctlblk {
62 unsigned long kprobe_status;
63 unsigned long kprobe_old_eflags;
64 unsigned long kprobe_saved_eflags;
65 long *jprobe_saved_esp;
66 struct pt_regs jprobe_saved_regs;
67 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
68 struct prev_kprobe prev_kprobe;
69};
70
71/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
72 * if necessary, before executing the original int3/1 (trap) handler.
73 */
74static inline void restore_interrupts(struct pt_regs *regs)
75{
76 if (regs->eflags & IF_MASK)
77 local_irq_enable();
78}
79
80extern int kprobe_exceptions_notify(struct notifier_block *self,
81 unsigned long val, void *data);
82#endif /* _ASM_KPROBES_H */