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Stephen Rothwellbbeb3f42005-09-27 13:51:59 +10001#ifndef _ASM_POWERPC_KPROBES_H
2#define _ASM_POWERPC_KPROBES_H
Arnd Bergmann88ced032005-12-16 22:43:46 +01003#ifdef __KERNEL__
Paul Mackerras14cf11a2005-09-26 16:04:21 +10004/*
5 * Kernel Probes (KProbes)
Paul Mackerras14cf11a2005-09-26 16:04:21 +10006 *
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>
Ananth N Mavinakayanahalli0dc036c2005-11-07 01:00:10 -080031#include <linux/percpu.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100032
Anil S Keshavamurthy2d14e392006-01-09 20:52:41 -080033#define __ARCH_WANT_KPROBES_INSN_SLOT
34
Paul Mackerras14cf11a2005-09-26 16:04:21 +100035struct pt_regs;
Ananth N Mavinakayanahalli0498b632006-01-09 20:52:46 -080036struct kprobe;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100037
38typedef 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
Kumar Gala82090032007-02-06 22:55:19 -060047#ifdef CONFIG_PPC64
Ananth N Mavinakayanahalli3a872d82006-10-02 02:17:30 -070048/*
49 * 64bit powerpc uses function descriptors.
50 * Handle cases where:
Ananth N Mavinakayanahalli412998c2006-10-02 02:17:31 -070051 * - User passes a <.symbol> or <module:.symbol>
52 * - User passes a <symbol> or <module:symbol>
Ananth N Mavinakayanahalli3a872d82006-10-02 02:17:30 -070053 * - 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); \
Ananth N Mavinakayanahalli412998c2006-10-02 02:17:31 -070059 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; \
Srinivasa Dseb609e52007-04-23 11:28:49 +053067 } else { \
Tejun Heo9281ace2007-07-17 04:03:51 -070068 char dot_name[KSYM_NAME_LEN]; \
Srinivasa Dseb609e52007-04-23 11:28:49 +053069 dot_name[0] = '.'; \
70 dot_name[1] = '\0'; \
Tejun Heo9281ace2007-07-17 04:03:51 -070071 strncat(dot_name, name, KSYM_NAME_LEN - 2); \
Srinivasa Dseb609e52007-04-23 11:28:49 +053072 addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
Ananth N Mavinakayanahalli412998c2006-10-02 02:17:31 -070073 } \
Ananth N Mavinakayanahalli3a872d82006-10-02 02:17:30 -070074}
75
Paul Mackerras14cf11a2005-09-26 16:04:21 +100076#define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \
77 IS_TWI(instr) || IS_TDI(instr))
Kumar Gala82090032007-02-06 22:55:19 -060078#else
79/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
Kumar Gala82090032007-02-06 22:55:19 -060080#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
81#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +100082
83#define ARCH_SUPPORTS_KRETPROBES
Anil S Keshavamurthye6f47f92006-06-26 00:25:29 -070084#define ARCH_INACTIVE_KPROBE_COUNT 1
bibo, maoa9ad9652006-07-30 03:03:26 -070085#define flush_insn_slot(p) do { } while (0)
Anil S Keshavamurthye6f47f92006-06-26 00:25:29 -070086
Paul Mackerras14cf11a2005-09-26 16:04:21 +100087void kretprobe_trampoline(void);
Ananth N Mavinakayanahalli0498b632006-01-09 20:52:46 -080088extern void arch_remove_kprobe(struct kprobe *p);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100089
90/* Architecture specific copy of original instruction */
91struct arch_specific_insn {
92 /* copy of original instruction */
93 kprobe_opcode_t *insn;
Ananth N Mavinakayanahallie6349a92007-04-18 15:57:51 +100094 /*
95 * Set in kprobes code, initially to 0. If the instruction can be
96 * eumulated, this is set to 1, if not, to -1.
97 */
98 int boostable;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100099};
100
Ananth N Mavinakayanahalli0dc036c2005-11-07 01:00:10 -0800101struct prev_kprobe {
102 struct kprobe *kp;
103 unsigned long status;
104 unsigned long saved_msr;
105};
106
107/* per-cpu kprobe control block */
108struct kprobe_ctlblk {
109 unsigned long kprobe_status;
110 unsigned long kprobe_saved_msr;
111 struct pt_regs jprobe_saved_regs;
112 struct prev_kprobe prev_kprobe;
113};
114
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000115extern int kprobe_exceptions_notify(struct notifier_block *self,
Anil S Keshavamurthy41dead42006-01-09 20:52:42 -0800116 unsigned long val, void *data);
Christoph Hellwig9f90b992007-04-30 11:56:46 +0100117extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
Arnd Bergmann88ced032005-12-16 22:43:46 +0100118#endif /* __KERNEL__ */
Stephen Rothwellbbeb3f42005-09-27 13:51:59 +1000119#endif /* _ASM_POWERPC_KPROBES_H */