1#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>
28#include <linux/percpu.h>
29
30#define  __ARCH_WANT_KPROBES_INSN_SLOT
31
32struct pt_regs;
33struct kprobe;
34
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
44#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)pentry
45#define ARCH_SUPPORTS_KRETPROBES
46#define  ARCH_INACTIVE_KPROBE_COUNT 1
47
48void kretprobe_trampoline(void);
49extern void arch_remove_kprobe(struct kprobe *p);
50#define flush_insn_slot(p)	do { } while (0)
51
52/* Architecture specific copy of original instruction*/
53struct arch_specific_insn {
54	/* copy of the original instruction */
55	kprobe_opcode_t *insn;
56};
57
58struct prev_kprobe {
59	struct kprobe *kp;
60	unsigned long status;
61	unsigned long old_rflags;
62	unsigned long saved_rflags;
63};
64
65/* per-cpu kprobe control block */
66struct kprobe_ctlblk {
67	unsigned long kprobe_status;
68	unsigned long kprobe_old_rflags;
69	unsigned long kprobe_saved_rflags;
70	long *jprobe_saved_rsp;
71	struct pt_regs jprobe_saved_regs;
72	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
73	struct prev_kprobe prev_kprobe;
74};
75
76/* trap3/1 are intr gates for kprobes.  So, restore the status of IF,
77 * if necessary, before executing the original int3/1 (trap) handler.
78 */
79static inline void restore_interrupts(struct pt_regs *regs)
80{
81	if (regs->eflags & IF_MASK)
82		local_irq_enable();
83}
84
85extern int post_kprobe_handler(struct pt_regs *regs);
86extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
87extern int kprobe_handler(struct pt_regs *regs);
88
89extern int kprobe_exceptions_notify(struct notifier_block *self,
90				    unsigned long val, void *data);
91#endif				/* _ASM_KPROBES_H */
92