1/*
2 *  Kernel Probes (KProbes)
3 *  include/asm-mips/kprobes.h
4 *
5 *  Copyright 2006 Sony Corp.
6 *  Copyright 2010 Cavium Networks
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU General Public License as published by
10 *  the Free Software Foundation; version 2 of the License.
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
22#ifndef _ASM_KPROBES_H
23#define _ASM_KPROBES_H
24
25#include <linux/ptrace.h>
26#include <linux/types.h>
27
28#include <asm/cacheflush.h>
29#include <asm/kdebug.h>
30#include <asm/inst.h>
31
32#define	 __ARCH_WANT_KPROBES_INSN_SLOT
33
34struct kprobe;
35struct pt_regs;
36
37typedef union mips_instruction kprobe_opcode_t;
38
39#define MAX_INSN_SIZE 2
40
41#define flush_insn_slot(p)						\
42do {									\
43	flush_icache_range((unsigned long)p->addr,			\
44			   (unsigned long)p->addr +			\
45			   (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)));	\
46} while (0)
47
48
49#define kretprobe_blacklist_size 0
50
51void arch_remove_kprobe(struct kprobe *p);
52
53/* Architecture specific copy of original instruction*/
54struct arch_specific_insn {
55	/* copy of the original instruction */
56	kprobe_opcode_t *insn;
57};
58
59struct prev_kprobe {
60	struct kprobe *kp;
61	unsigned long status;
62	unsigned long old_SR;
63	unsigned long saved_SR;
64	unsigned long saved_epc;
65};
66
67#define MAX_JPROBES_STACK_SIZE 128
68#define MAX_JPROBES_STACK_ADDR \
69	(((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs))
70
71#define MIN_JPROBES_STACK_SIZE(ADDR)					\
72	((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)	\
73		? MAX_JPROBES_STACK_ADDR - (ADDR)			\
74		: MAX_JPROBES_STACK_SIZE)
75
76
77#define SKIP_DELAYSLOT 0x0001
78
79/* per-cpu kprobe control block */
80struct kprobe_ctlblk {
81	unsigned long kprobe_status;
82	unsigned long kprobe_old_SR;
83	unsigned long kprobe_saved_SR;
84	unsigned long kprobe_saved_epc;
85	unsigned long jprobe_saved_sp;
86	struct pt_regs jprobe_saved_regs;
87	/* Per-thread fields, used while emulating branches */
88	unsigned long flags;
89	unsigned long target_epc;
90	u8 jprobes_stack[MAX_JPROBES_STACK_SIZE];
91	struct prev_kprobe prev_kprobe;
92};
93
94extern int kprobe_exceptions_notify(struct notifier_block *self,
95				    unsigned long val, void *data);
96
97#endif				/* _ASM_KPROBES_H */
98