summaryrefslogtreecommitdiff
path: root/include/asm-powerpc/kprobes.h
blob: 1ef54be6abfa6272abfe83b1a026def2743a826b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
#ifndef _ASM_POWERPC_KPROBES_H
#define _ASM_POWERPC_KPROBES_H
#ifdef __KERNEL__
/*
 *  Kernel Probes (KProbes)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2002, 2004
 *
 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *		Probes initial implementation ( includes suggestions from
 *		Rusty Russell).
 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
 *		<ananth@in.ibm.com>
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef unsigned int kprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION	0x7fe00008	/* trap */
#define MAX_INSN_SIZE 1

#define IS_TW(instr)		(((instr) & 0xfc0007fe) == 0x7c000008)
#define IS_TD(instr)		(((instr) & 0xfc0007fe) == 0x7c000088)
#define IS_TDI(instr)		(((instr) & 0xfc000000) == 0x08000000)
#define IS_TWI(instr)		(((instr) & 0xfc000000) == 0x0c000000)

/*
 * 64bit powerpc uses function descriptors.
 * Handle cases where:
 * 		- User passes a <.symbol>
 * 		- User passes a <symbol>
 * 		- User passes a non-existant symbol, kallsyms_lookup_name
 * 		  returns 0. Don't deref the NULL pointer in that case
 */
#define kprobe_lookup_name(name, addr)					\
{									\
	addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);		\
	if (!(name[0] == '.') && addr)					\
		addr = *(kprobe_opcode_t **)addr;			\
}

#define JPROBE_ENTRY(pentry)	(kprobe_opcode_t *)((func_descr_t *)pentry)

#define is_trap(instr)	(IS_TW(instr) || IS_TD(instr) || \
			IS_TWI(instr) || IS_TDI(instr))

#define ARCH_SUPPORTS_KRETPROBES
#define  ARCH_INACTIVE_KPROBE_COUNT 1
#define flush_insn_slot(p)	do { } while (0)

void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);

/* Architecture specific copy of original instruction */
struct arch_specific_insn {
	/* copy of original instruction */
	kprobe_opcode_t *insn;
};

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
	unsigned long saved_msr;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_saved_msr;
	struct pt_regs jprobe_saved_regs;
	struct prev_kprobe prev_kprobe;
};

extern int kprobe_exceptions_notify(struct notifier_block *self,
					unsigned long val, void *data);
#endif /* __KERNEL__ */
#endif	/* _ASM_POWERPC_KPROBES_H */