1/*
 2 * arch/tile/include/asm/kprobes.h
 3 *
 4 * Copyright 2012 Tilera Corporation. All Rights Reserved.
 5 *
 6 *   This program is free software; you can redistribute it and/or
 7 *   modify it under the terms of the GNU General Public License
 8 *   as published by the Free Software Foundation, version 2.
 9 *
10 *   This program is distributed in the hope that it will be useful, but
11 *   WITHOUT ANY WARRANTY; without even the implied warranty of
12 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 *   NON INFRINGEMENT.  See the GNU General Public License for
14 *   more details.
15 */
16
17#ifndef _ASM_TILE_KPROBES_H
18#define _ASM_TILE_KPROBES_H
19
20#include <linux/types.h>
21#include <linux/ptrace.h>
22#include <linux/percpu.h>
23
24#include <arch/opcode.h>
25
26#define __ARCH_WANT_KPROBES_INSN_SLOT
27#define MAX_INSN_SIZE			2
28
29#define kretprobe_blacklist_size 0
30
31typedef tile_bundle_bits kprobe_opcode_t;
32
33#define flush_insn_slot(p)						\
34	flush_icache_range((unsigned long)p->addr,			\
35			   (unsigned long)p->addr +			\
36			   (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
37
38struct kprobe;
39
40/* Architecture specific copy of original instruction. */
41struct arch_specific_insn {
42	kprobe_opcode_t *insn;
43};
44
45struct prev_kprobe {
46	struct kprobe *kp;
47	unsigned long status;
48	unsigned long saved_pc;
49};
50
51#define MAX_JPROBES_STACK_SIZE 128
52#define MAX_JPROBES_STACK_ADDR \
53	(((unsigned long)current_thread_info()) + THREAD_SIZE - 32 \
54		- sizeof(struct pt_regs))
55
56#define MIN_JPROBES_STACK_SIZE(ADDR)					\
57	((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)	\
58		? MAX_JPROBES_STACK_ADDR - (ADDR)			\
59		: MAX_JPROBES_STACK_SIZE)
60
61/* per-cpu kprobe control block. */
62struct kprobe_ctlblk {
63	unsigned long kprobe_status;
64	unsigned long kprobe_saved_pc;
65	unsigned long jprobe_saved_sp;
66	struct prev_kprobe prev_kprobe;
67	struct pt_regs jprobe_saved_regs;
68	char jprobes_stack[MAX_JPROBES_STACK_SIZE];
69};
70
71extern tile_bundle_bits breakpoint2_insn;
72extern tile_bundle_bits breakpoint_insn;
73
74void arch_remove_kprobe(struct kprobe *);
75
76extern int kprobe_exceptions_notify(struct notifier_block *self,
77			     unsigned long val, void *data);
78
79#endif /* _ASM_TILE_KPROBES_H */