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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> |
14cf11af | 32 | |
2d14e39d AK |
33 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
34 | ||
14cf11af | 35 | struct pt_regs; |
0498b635 | 36 | struct kprobe; |
14cf11af PM |
37 | |
38 | typedef unsigned int kprobe_opcode_t; | |
39 | #define BREAKPOINT_INSTRUCTION 0x7fe00008 /* trap */ | |
40 | #define MAX_INSN_SIZE 1 | |
41 | ||
42 | #define IS_TW(instr) (((instr) & 0xfc0007fe) == 0x7c000008) | |
43 | #define IS_TD(instr) (((instr) & 0xfc0007fe) == 0x7c000088) | |
44 | #define IS_TDI(instr) (((instr) & 0xfc000000) == 0x08000000) | |
45 | #define IS_TWI(instr) (((instr) & 0xfc000000) == 0x0c000000) | |
46 | ||
82090035 | 47 | #ifdef CONFIG_PPC64 |
3a872d89 AM |
48 | /* |
49 | * 64bit powerpc uses function descriptors. | |
50 | * Handle cases where: | |
412998cf AM |
51 | * - User passes a <.symbol> or <module:.symbol> |
52 | * - User passes a <symbol> or <module:symbol> | |
3a872d89 AM |
53 | * - User passes a non-existant symbol, kallsyms_lookup_name |
54 | * returns 0. Don't deref the NULL pointer in that case | |
55 | */ | |
56 | #define kprobe_lookup_name(name, addr) \ | |
57 | { \ | |
58 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \ | |
412998cf AM |
59 | if (addr) { \ |
60 | char *colon; \ | |
61 | if ((colon = strchr(name, ':')) != NULL) { \ | |
62 | colon++; \ | |
63 | if (*colon != '\0' && *colon != '.') \ | |
64 | addr = *(kprobe_opcode_t **)addr; \ | |
65 | } else if (name[0] != '.') \ | |
66 | addr = *(kprobe_opcode_t **)addr; \ | |
eb609e52 | 67 | } else { \ |
9281acea | 68 | char dot_name[KSYM_NAME_LEN]; \ |
eb609e52 SD |
69 | dot_name[0] = '.'; \ |
70 | dot_name[1] = '\0'; \ | |
9281acea | 71 | strncat(dot_name, name, KSYM_NAME_LEN - 2); \ |
eb609e52 | 72 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ |
412998cf | 73 | } \ |
3a872d89 AM |
74 | } |
75 | ||
14cf11af PM |
76 | #define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \ |
77 | IS_TWI(instr) || IS_TDI(instr)) | |
82090035 KG |
78 | #else |
79 | /* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */ | |
82090035 KG |
80 | #define is_trap(instr) (IS_TW(instr) || IS_TWI(instr)) |
81 | #endif | |
14cf11af | 82 | |
a9ad965e | 83 | #define flush_insn_slot(p) do { } while (0) |
f438d914 | 84 | #define kretprobe_blacklist_size 0 |
e6f47f97 | 85 | |
14cf11af | 86 | void kretprobe_trampoline(void); |
0498b635 | 87 | extern void arch_remove_kprobe(struct kprobe *p); |
14cf11af PM |
88 | |
89 | /* Architecture specific copy of original instruction */ | |
90 | struct arch_specific_insn { | |
91 | /* copy of original instruction */ | |
92 | kprobe_opcode_t *insn; | |
e6349a95 AM |
93 | /* |
94 | * Set in kprobes code, initially to 0. If the instruction can be | |
95 | * eumulated, this is set to 1, if not, to -1. | |
96 | */ | |
97 | int boostable; | |
14cf11af PM |
98 | }; |
99 | ||
0dc036c9 AM |
100 | struct prev_kprobe { |
101 | struct kprobe *kp; | |
102 | unsigned long status; | |
103 | unsigned long saved_msr; | |
104 | }; | |
105 | ||
106 | /* per-cpu kprobe control block */ | |
107 | struct kprobe_ctlblk { | |
108 | unsigned long kprobe_status; | |
109 | unsigned long kprobe_saved_msr; | |
110 | struct pt_regs jprobe_saved_regs; | |
111 | struct prev_kprobe prev_kprobe; | |
112 | }; | |
113 | ||
14cf11af | 114 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
41dead49 | 115 | unsigned long val, void *data); |
9f90b997 | 116 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
88ced031 | 117 | #endif /* __KERNEL__ */ |
bbeb3f4c | 118 | #endif /* _ASM_POWERPC_KPROBES_H */ |