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1#ifndef _ASM_POWERPC_KPROBES_H
2#define _ASM_POWERPC_KPROBES_H
3
4#include <asm-generic/kprobes.h>
5
6#ifdef __KERNEL__
7/*
8 * Kernel Probes (KProbes)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 * Copyright (C) IBM Corporation, 2002, 2004
25 *
26 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
27 * Probes initial implementation ( includes suggestions from
28 * Rusty Russell).
29 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
30 * <ananth@in.ibm.com>
31 */
32#include <linux/types.h>
33#include <linux/ptrace.h>
34#include <linux/percpu.h>
35#include <linux/module.h>
36#include <asm/probes.h>
37#include <asm/code-patching.h>
38
39#ifdef CONFIG_KPROBES
40#define __ARCH_WANT_KPROBES_INSN_SLOT
41
42struct pt_regs;
43struct kprobe;
44
45typedef ppc_opcode_t kprobe_opcode_t;
46
47extern kprobe_opcode_t optinsn_slot;
48
49/* Optinsn template address */
50extern kprobe_opcode_t optprobe_template_entry[];
51extern kprobe_opcode_t optprobe_template_op_address[];
52extern kprobe_opcode_t optprobe_template_call_handler[];
53extern kprobe_opcode_t optprobe_template_insn[];
54extern kprobe_opcode_t optprobe_template_call_emulate[];
55extern kprobe_opcode_t optprobe_template_ret[];
56extern kprobe_opcode_t optprobe_template_end[];
57
58/* Fixed instruction size for powerpc */
59#define MAX_INSN_SIZE 1
60#define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */
61#define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry)
62#define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */
63
64#ifdef PPC64_ELF_ABI_v2
65/* PPC64 ABIv2 needs local entry point */
66#define kprobe_lookup_name(name, addr) \
67{ \
68 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
69 if (addr) \
70 addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
71}
72#elif defined(PPC64_ELF_ABI_v1)
73/*
74 * 64bit powerpc ABIv1 uses function descriptors:
75 * - Check for the dot variant of the symbol first.
76 * - If that fails, try looking up the symbol provided.
77 *
78 * This ensures we always get to the actual symbol and not the descriptor.
79 * Also handle <module:symbol> format.
80 */
81#define kprobe_lookup_name(name, addr) \
82{ \
83 char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \
84 const char *modsym; \
85 bool dot_appended = false; \
86 if ((modsym = strchr(name, ':')) != NULL) { \
87 modsym++; \
88 if (*modsym != '\0' && *modsym != '.') { \
89 /* Convert to <module:.symbol> */ \
90 strncpy(dot_name, name, modsym - name); \
91 dot_name[modsym - name] = '.'; \
92 dot_name[modsym - name + 1] = '\0'; \
93 strncat(dot_name, modsym, \
94 sizeof(dot_name) - (modsym - name) - 2);\
95 dot_appended = true; \
96 } else { \
97 dot_name[0] = '\0'; \
98 strncat(dot_name, name, sizeof(dot_name) - 1); \
99 } \
100 } else if (name[0] != '.') { \
101 dot_name[0] = '.'; \
102 dot_name[1] = '\0'; \
103 strncat(dot_name, name, KSYM_NAME_LEN - 2); \
104 dot_appended = true; \
105 } else { \
106 dot_name[0] = '\0'; \
107 strncat(dot_name, name, KSYM_NAME_LEN - 1); \
108 } \
109 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
110 if (!addr && dot_appended) { \
111 /* Let's try the original non-dot symbol lookup */ \
112 addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
113 } \
114}
115#endif
116
117#define flush_insn_slot(p) do { } while (0)
118#define kretprobe_blacklist_size 0
119
120void kretprobe_trampoline(void);
121extern void arch_remove_kprobe(struct kprobe *p);
122
123/* Architecture specific copy of original instruction */
124struct arch_specific_insn {
125 /* copy of original instruction */
126 kprobe_opcode_t *insn;
127 /*
128 * Set in kprobes code, initially to 0. If the instruction can be
129 * eumulated, this is set to 1, if not, to -1.
130 */
131 int boostable;
132};
133
134struct prev_kprobe {
135 struct kprobe *kp;
136 unsigned long status;
137 unsigned long saved_msr;
138};
139
140/* per-cpu kprobe control block */
141struct kprobe_ctlblk {
142 unsigned long kprobe_status;
143 unsigned long kprobe_saved_msr;
144 struct pt_regs jprobe_saved_regs;
145 struct prev_kprobe prev_kprobe;
146};
147
148struct arch_optimized_insn {
149 kprobe_opcode_t copied_insn[1];
150 /* detour buffer */
151 kprobe_opcode_t *insn;
152};
153
154extern int kprobe_exceptions_notify(struct notifier_block *self,
155 unsigned long val, void *data);
156extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
157extern int kprobe_handler(struct pt_regs *regs);
158extern int kprobe_post_handler(struct pt_regs *regs);
159#else
160static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
161static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
162#endif /* CONFIG_KPROBES */
163#endif /* __KERNEL__ */
164#endif /* _ASM_POWERPC_KPROBES_H */