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kprobes.h
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1 #ifndef _ASM_POWERPC_KPROBES_H
2 #define _ASM_POWERPC_KPROBES_H
3 #ifdef __KERNEL__
4 /*
5  * Kernel Probes (KProbes)
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
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  * Copyright (C) IBM Corporation, 2002, 2004
22  *
23  * 2002-Oct Created by Vamsi Krishna S <[email protected]> Kernel
24  * Probes initial implementation ( includes suggestions from
25  * Rusty Russell).
26  * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
28  */
29 #include <linux/types.h>
30 #include <linux/ptrace.h>
31 #include <linux/percpu.h>
32 #include <asm/probes.h>
33 
34 #define __ARCH_WANT_KPROBES_INSN_SLOT
35 
36 struct pt_regs;
37 struct kprobe;
38 
39 typedef ppc_opcode_t kprobe_opcode_t;
40 #define MAX_INSN_SIZE 1
41 
42 #ifdef CONFIG_PPC64
43 /*
44  * 64bit powerpc uses function descriptors.
45  * Handle cases where:
46  * - User passes a <.symbol> or <module:.symbol>
47  * - User passes a <symbol> or <module:symbol>
48  * - User passes a non-existent symbol, kallsyms_lookup_name
49  * returns 0. Don't deref the NULL pointer in that case
50  */
51 #define kprobe_lookup_name(name, addr) \
52 { \
53  addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
54  if (addr) { \
55  char *colon; \
56  if ((colon = strchr(name, ':')) != NULL) { \
57  colon++; \
58  if (*colon != '\0' && *colon != '.') \
59  addr = *(kprobe_opcode_t **)addr; \
60  } else if (name[0] != '.') \
61  addr = *(kprobe_opcode_t **)addr; \
62  } else { \
63  char dot_name[KSYM_NAME_LEN]; \
64  dot_name[0] = '.'; \
65  dot_name[1] = '\0'; \
66  strncat(dot_name, name, KSYM_NAME_LEN - 2); \
67  addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
68  } \
69 }
70 #endif
71 
72 #define flush_insn_slot(p) do { } while (0)
73 #define kretprobe_blacklist_size 0
74 
75 void kretprobe_trampoline(void);
76 extern void arch_remove_kprobe(struct kprobe *p);
77 
78 /* Architecture specific copy of original instruction */
79 struct arch_specific_insn {
80  /* copy of original instruction */
82  /*
83  * Set in kprobes code, initially to 0. If the instruction can be
84  * eumulated, this is set to 1, if not, to -1.
85  */
86  int boostable;
87 };
88 
89 struct prev_kprobe {
90  struct kprobe *kp;
91  unsigned long status;
92  unsigned long saved_msr;
93 };
94 
95 /* per-cpu kprobe control block */
96 struct kprobe_ctlblk {
97  unsigned long kprobe_status;
98  unsigned long kprobe_saved_msr;
100  struct prev_kprobe prev_kprobe;
101 };
102 
103 extern int kprobe_exceptions_notify(struct notifier_block *self,
104  unsigned long val, void *data);
105 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
106 #endif /* __KERNEL__ */
107 #endif /* _ASM_POWERPC_KPROBES_H */