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 <asm/probes.h>
33 #include <asm/code-patching.h>
35 #define __ARCH_WANT_KPROBES_INSN_SLOT
40 typedef ppc_opcode_t kprobe_opcode_t;
41 #define MAX_INSN_SIZE 1
43 #ifdef PPC64_ELF_ABI_v2
44 /* PPC64 ABIv2 needs local entry point */
45 #define kprobe_lookup_name(name, addr) \
47 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
49 addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
51 #elif defined(PPC64_ELF_ABI_v1)
53 * 64bit powerpc ABIv1 uses function descriptors:
54 * - Check for the dot variant of the symbol first.
55 * - If that fails, try looking up the symbol provided.
57 * This ensures we always get to the actual symbol and not the descriptor.
58 * Also handle <module:symbol> format.
60 #define kprobe_lookup_name(name, addr) \
62 char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \
64 bool dot_appended = false; \
65 if ((modsym = strchr(name, ':')) != NULL) { \
67 if (*modsym != '\0' && *modsym != '.') { \
68 /* Convert to <module:.symbol> */ \
69 strncpy(dot_name, name, modsym - name); \
70 dot_name[modsym - name] = '.'; \
71 dot_name[modsym - name + 1] = '\0'; \
72 strncat(dot_name, modsym, \
73 sizeof(dot_name) - (modsym - name) - 2);\
74 dot_appended = true; \
77 strncat(dot_name, name, sizeof(dot_name) - 1); \
79 } else if (name[0] != '.') { \
82 strncat(dot_name, name, KSYM_NAME_LEN - 2); \
83 dot_appended = true; \
86 strncat(dot_name, name, KSYM_NAME_LEN - 1); \
88 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
89 if (!addr && dot_appended) { \
90 /* Let's try the original non-dot symbol lookup */ \
91 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
96 #define flush_insn_slot(p) do { } while (0)
97 #define kretprobe_blacklist_size 0
99 void kretprobe_trampoline(void);
100 extern void arch_remove_kprobe(struct kprobe *p);
102 /* Architecture specific copy of original instruction */
103 struct arch_specific_insn {
104 /* copy of original instruction */
105 kprobe_opcode_t *insn;
107 * Set in kprobes code, initially to 0. If the instruction can be
108 * eumulated, this is set to 1, if not, to -1.
115 unsigned long status;
116 unsigned long saved_msr;
119 /* per-cpu kprobe control block */
120 struct kprobe_ctlblk {
121 unsigned long kprobe_status;
122 unsigned long kprobe_saved_msr;
123 struct pt_regs jprobe_saved_regs;
124 struct prev_kprobe prev_kprobe;
127 extern int kprobe_exceptions_notify(struct notifier_block *self,
128 unsigned long val, void *data);
129 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
130 #endif /* __KERNEL__ */
131 #endif /* _ASM_POWERPC_KPROBES_H */