1 #ifndef _ASM_POWERPC_KPROBES_H
2 #define _ASM_POWERPC_KPROBES_H
5 * Kernel Probes (KProbes)
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.
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.
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.
21 * Copyright (C) IBM Corporation, 2002, 2004
23 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
24 * Probes initial implementation ( includes suggestions from
26 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
29 #include <linux/types.h>
30 #include <linux/ptrace.h>
31 #include <linux/percpu.h>
32 #include <linux/module.h>
33 #include <asm/probes.h>
34 #include <asm/code-patching.h>
36 #define __ARCH_WANT_KPROBES_INSN_SLOT
41 typedef ppc_opcode_t kprobe_opcode_t;
42 #define MAX_INSN_SIZE 1
45 #if defined(_CALL_ELF) && _CALL_ELF == 2
46 /* PPC64 ABIv2 needs local entry point */
47 #define kprobe_lookup_name(name, addr) \
49 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
51 addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
55 * 64bit powerpc ABIv1 uses function descriptors:
56 * - Check for the dot variant of the symbol first.
57 * - If that fails, try looking up the symbol provided.
59 * This ensures we always get to the actual symbol and not the descriptor.
60 * Also handle <module:symbol> format.
62 #define kprobe_lookup_name(name, addr) \
64 char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \
66 bool dot_appended = false; \
67 if ((modsym = strchr(name, ':')) != NULL) { \
69 if (*modsym != '\0' && *modsym != '.') { \
70 /* Convert to <module:.symbol> */ \
71 strncpy(dot_name, name, modsym - name); \
72 dot_name[modsym - name] = '.'; \
73 dot_name[modsym - name + 1] = '\0'; \
74 strncat(dot_name, modsym, \
75 sizeof(dot_name) - (modsym - name) - 2);\
76 dot_appended = true; \
79 strncat(dot_name, name, sizeof(dot_name) - 1); \
81 } else if (name[0] != '.') { \
84 strncat(dot_name, name, KSYM_NAME_LEN - 2); \
85 dot_appended = true; \
88 strncat(dot_name, name, KSYM_NAME_LEN - 1); \
90 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
91 if (!addr && dot_appended) { \
92 /* Let's try the original non-dot symbol lookup */ \
93 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
96 #endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */
97 #endif /* CONFIG_PPC64 */
99 #define flush_insn_slot(p) do { } while (0)
100 #define kretprobe_blacklist_size 0
102 void kretprobe_trampoline(void);
103 extern void arch_remove_kprobe(struct kprobe *p);
105 /* Architecture specific copy of original instruction */
106 struct arch_specific_insn {
107 /* copy of original instruction */
108 kprobe_opcode_t *insn;
110 * Set in kprobes code, initially to 0. If the instruction can be
111 * eumulated, this is set to 1, if not, to -1.
118 unsigned long status;
119 unsigned long saved_msr;
122 /* per-cpu kprobe control block */
123 struct kprobe_ctlblk {
124 unsigned long kprobe_status;
125 unsigned long kprobe_saved_msr;
126 struct pt_regs jprobe_saved_regs;
127 struct prev_kprobe prev_kprobe;
130 extern int kprobe_exceptions_notify(struct notifier_block *self,
131 unsigned long val, void *data);
132 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
133 #endif /* __KERNEL__ */
134 #endif /* _ASM_POWERPC_KPROBES_H */