Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
kprobes.h
Go to the documentation of this file.
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 
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 */
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 #define SKIP_DELAYSLOT 0x0001
78 
79 /* per-cpu kprobe control block */
80 struct 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;
87  /* Per-thread fields, used while emulating branches */
88  unsigned long flags;
89  unsigned long target_epc;
91  struct prev_kprobe prev_kprobe;
92 };
93 
94 extern int kprobe_exceptions_notify(struct notifier_block *self,
95  unsigned long val, void *data);
96 
97 #endif /* _ASM_KPROBES_H */