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bbeb3f4c SR |
1 | #ifndef _ASM_POWERPC_KPROBES_H |
2 | #define _ASM_POWERPC_KPROBES_H | |
88ced031 | 3 | #ifdef __KERNEL__ |
14cf11af PM |
4 | /* |
5 | * Kernel Probes (KProbes) | |
14cf11af PM |
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 <vamsi_krishna@in.ibm.com> Kernel | |
24 | * Probes initial implementation ( includes suggestions from | |
25 | * Rusty Russell). | |
26 | * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli | |
27 | * <ananth@in.ibm.com> | |
28 | */ | |
29 | #include <linux/types.h> | |
30 | #include <linux/ptrace.h> | |
0dc036c9 | 31 | #include <linux/percpu.h> |
7118e7e6 | 32 | #include <asm/probes.h> |
47f86b4e | 33 | #include <asm/code-patching.h> |
14cf11af | 34 | |
2d14e39d AK |
35 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
36 | ||
14cf11af | 37 | struct pt_regs; |
0498b635 | 38 | struct kprobe; |
14cf11af | 39 | |
28e1e58f | 40 | typedef ppc_opcode_t kprobe_opcode_t; |
14cf11af PM |
41 | #define MAX_INSN_SIZE 1 |
42 | ||
82090035 | 43 | #ifdef CONFIG_PPC64 |
bf794bf5 NR |
44 | #if defined(_CALL_ELF) && _CALL_ELF == 2 |
45 | /* PPC64 ABIv2 needs local entry point */ | |
46 | #define kprobe_lookup_name(name, addr) \ | |
47 | { \ | |
48 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ | |
49 | if (addr) \ | |
50 | addr = (kprobe_opcode_t *)ppc_function_entry(addr); \ | |
51 | } | |
52 | #else | |
3a872d89 | 53 | /* |
bf794bf5 NR |
54 | * 64bit powerpc ABIv1 uses function descriptors: |
55 | * - Check for the dot variant of the symbol first. | |
56 | * - If that fails, try looking up the symbol provided. | |
57 | * | |
58 | * This ensures we always get to the actual symbol and not the descriptor. | |
59 | * Also handle <module:symbol> format. | |
3a872d89 AM |
60 | */ |
61 | #define kprobe_lookup_name(name, addr) \ | |
62 | { \ | |
bf794bf5 NR |
63 | char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \ |
64 | char *modsym; \ | |
65 | bool dot_appended = false; \ | |
66 | if ((modsym = strchr(name, ':')) != NULL) { \ | |
67 | modsym++; \ | |
68 | if (*modsym != '\0' && *modsym != '.') { \ | |
69 | /* Convert to <module:.symbol> */ \ | |
70 | strncpy(dot_name, name, modsym - name); \ | |
71 | dot_name[modsym - name] = '.'; \ | |
72 | dot_name[modsym - name + 1] = '\0'; \ | |
73 | strncat(dot_name, modsym, \ | |
74 | sizeof(dot_name) - (modsym - name) - 2);\ | |
75 | dot_appended = true; \ | |
76 | } else { \ | |
77 | dot_name[0] = '\0'; \ | |
78 | strncat(dot_name, name, sizeof(dot_name) - 1); \ | |
79 | } \ | |
80 | } else if (name[0] != '.') { \ | |
eb609e52 SD |
81 | dot_name[0] = '.'; \ |
82 | dot_name[1] = '\0'; \ | |
9281acea | 83 | strncat(dot_name, name, KSYM_NAME_LEN - 2); \ |
bf794bf5 NR |
84 | dot_appended = true; \ |
85 | } else { \ | |
86 | dot_name[0] = '\0'; \ | |
87 | strncat(dot_name, name, KSYM_NAME_LEN - 1); \ | |
88 | } \ | |
89 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ | |
90 | if (!addr && dot_appended) { \ | |
91 | /* Let's try the original non-dot symbol lookup */ \ | |
92 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ | |
412998cf | 93 | } \ |
3a872d89 | 94 | } |
bf794bf5 NR |
95 | #endif /* defined(_CALL_ELF) && _CALL_ELF == 2 */ |
96 | #endif /* CONFIG_PPC64 */ | |
14cf11af | 97 | |
a9ad965e | 98 | #define flush_insn_slot(p) do { } while (0) |
f438d914 | 99 | #define kretprobe_blacklist_size 0 |
e6f47f97 | 100 | |
14cf11af | 101 | void kretprobe_trampoline(void); |
0498b635 | 102 | extern void arch_remove_kprobe(struct kprobe *p); |
14cf11af PM |
103 | |
104 | /* Architecture specific copy of original instruction */ | |
105 | struct arch_specific_insn { | |
106 | /* copy of original instruction */ | |
107 | kprobe_opcode_t *insn; | |
e6349a95 AM |
108 | /* |
109 | * Set in kprobes code, initially to 0. If the instruction can be | |
110 | * eumulated, this is set to 1, if not, to -1. | |
111 | */ | |
112 | int boostable; | |
14cf11af PM |
113 | }; |
114 | ||
0dc036c9 AM |
115 | struct prev_kprobe { |
116 | struct kprobe *kp; | |
117 | unsigned long status; | |
118 | unsigned long saved_msr; | |
119 | }; | |
120 | ||
121 | /* per-cpu kprobe control block */ | |
122 | struct kprobe_ctlblk { | |
123 | unsigned long kprobe_status; | |
124 | unsigned long kprobe_saved_msr; | |
125 | struct pt_regs jprobe_saved_regs; | |
126 | struct prev_kprobe prev_kprobe; | |
127 | }; | |
128 | ||
14cf11af | 129 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
41dead49 | 130 | unsigned long val, void *data); |
9f90b997 | 131 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
88ced031 | 132 | #endif /* __KERNEL__ */ |
bbeb3f4c | 133 | #endif /* _ASM_POWERPC_KPROBES_H */ |