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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-x86_64/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 * 2004-Oct Prasanna S Panchamukhi <prasanna@in.ibm.com> and Jim Keniston
24 * kenistoj@us.ibm.com adopted from i386.
25 */
26#include <linux/types.h>
27#include <linux/ptrace.h>
Ananth N Mavinakayanahallie7a510f2005-11-07 01:00:12 -080028#include <linux/percpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Anil S Keshavamurthy2d14e392006-01-09 20:52:41 -080030#define __ARCH_WANT_KPROBES_INSN_SLOT
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032struct pt_regs;
Ananth N Mavinakayanahalli0498b632006-01-09 20:52:46 -080033struct kprobe;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35typedef u8 kprobe_opcode_t;
36#define BREAKPOINT_INSTRUCTION 0xcc
37#define MAX_INSN_SIZE 15
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
Rusty Lynch73649da2005-06-23 00:09:23 -070044#define ARCH_SUPPORTS_KRETPROBES
Anil S Keshavamurthye6f47f92006-06-26 00:25:29 -070045#define ARCH_INACTIVE_KPROBE_COUNT 1
Rusty Lynch73649da2005-06-23 00:09:23 -070046
47void kretprobe_trampoline(void);
Ananth N Mavinakayanahalli0498b632006-01-09 20:52:46 -080048extern void arch_remove_kprobe(struct kprobe *p);
bibo, maoa9ad9652006-07-30 03:03:26 -070049#define flush_insn_slot(p) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/* Architecture specific copy of original instruction*/
52struct arch_specific_insn {
53 /* copy of the original instruction */
54 kprobe_opcode_t *insn;
55};
56
Ananth N Mavinakayanahallie7a510f2005-11-07 01:00:12 -080057struct prev_kprobe {
58 struct kprobe *kp;
59 unsigned long status;
60 unsigned long old_rflags;
61 unsigned long saved_rflags;
62};
63
64/* per-cpu kprobe control block */
65struct kprobe_ctlblk {
66 unsigned long kprobe_status;
67 unsigned long kprobe_old_rflags;
68 unsigned long kprobe_saved_rflags;
69 long *jprobe_saved_rsp;
70 struct pt_regs jprobe_saved_regs;
71 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
72 struct prev_kprobe prev_kprobe;
73};
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075/* trap3/1 are intr gates for kprobes. So, restore the status of IF,
76 * if necessary, before executing the original int3/1 (trap) handler.
77 */
78static inline void restore_interrupts(struct pt_regs *regs)
79{
80 if (regs->eflags & IF_MASK)
81 local_irq_enable();
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084extern int post_kprobe_handler(struct pt_regs *regs);
85extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
86extern int kprobe_handler(struct pt_regs *regs);
87
88extern int kprobe_exceptions_notify(struct notifier_block *self,
89 unsigned long val, void *data);
90#endif /* _ASM_KPROBES_H */