Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
[linux-2.6.git] / arch / mips / include / asm / kprobes.h
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
34 struct kprobe;
35 struct pt_regs;
36
37 typedef union mips_instruction kprobe_opcode_t;
38
39 #define MAX_INSN_SIZE 2
40
41 #define flush_insn_slot(p)                                              \
42 do {                                                                    \
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
51 void arch_remove_kprobe(struct kprobe *p);
52
53 /* Architecture specific copy of original instruction*/
54 struct arch_specific_insn {
55         /* copy of the original instruction */
56         kprobe_opcode_t *insn;
57 };
58
59 struct 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 /* per-cpu kprobe control block */
78 struct kprobe_ctlblk {
79         unsigned long kprobe_status;
80         unsigned long kprobe_old_SR;
81         unsigned long kprobe_saved_SR;
82         unsigned long kprobe_saved_epc;
83         unsigned long jprobe_saved_sp;
84         struct pt_regs jprobe_saved_regs;
85         u8 jprobes_stack[MAX_JPROBES_STACK_SIZE];
86         struct prev_kprobe prev_kprobe;
87 };
88
89 extern int kprobe_exceptions_notify(struct notifier_block *self,
90                                     unsigned long val, void *data);
91
92 #endif                          /* _ASM_KPROBES_H */