Stephen Rothwell | bbeb3f4 | 2005-09-27 13:51:59 +1000 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_KPROBES_H |
| 2 | #define _ASM_POWERPC_KPROBES_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 4 | /* |
| 5 | * Kernel Probes (KProbes) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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> |
Ananth N Mavinakayanahalli | 0dc036c | 2005-11-07 01:00:10 -0800 | [diff] [blame] | 31 | #include <linux/percpu.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 32 | |
Anil S Keshavamurthy | 2d14e39 | 2006-01-09 20:52:41 -0800 | [diff] [blame] | 33 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
| 34 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 35 | struct pt_regs; |
Ananth N Mavinakayanahalli | 0498b63 | 2006-01-09 20:52:46 -0800 | [diff] [blame] | 36 | struct kprobe; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Kumar Gala | 8209003 | 2007-02-06 22:55:19 -0600 | [diff] [blame] | 47 | #ifdef CONFIG_PPC64 |
Ananth N Mavinakayanahalli | 3a872d8 | 2006-10-02 02:17:30 -0700 | [diff] [blame] | 48 | /* |
| 49 | * 64bit powerpc uses function descriptors. |
| 50 | * Handle cases where: |
Ananth N Mavinakayanahalli | 412998c | 2006-10-02 02:17:31 -0700 | [diff] [blame] | 51 | * - User passes a <.symbol> or <module:.symbol> |
| 52 | * - User passes a <symbol> or <module:symbol> |
Ananth N Mavinakayanahalli | 3a872d8 | 2006-10-02 02:17:30 -0700 | [diff] [blame] | 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); \ |
Ananth N Mavinakayanahalli | 412998c | 2006-10-02 02:17:31 -0700 | [diff] [blame] | 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; \ |
Srinivasa Ds | eb609e5 | 2007-04-23 11:28:49 +0530 | [diff] [blame] | 67 | } else { \ |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 68 | char dot_name[KSYM_NAME_LEN]; \ |
Srinivasa Ds | eb609e5 | 2007-04-23 11:28:49 +0530 | [diff] [blame] | 69 | dot_name[0] = '.'; \ |
| 70 | dot_name[1] = '\0'; \ |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 71 | strncat(dot_name, name, KSYM_NAME_LEN - 2); \ |
Srinivasa Ds | eb609e5 | 2007-04-23 11:28:49 +0530 | [diff] [blame] | 72 | addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \ |
Ananth N Mavinakayanahalli | 412998c | 2006-10-02 02:17:31 -0700 | [diff] [blame] | 73 | } \ |
Ananth N Mavinakayanahalli | 3a872d8 | 2006-10-02 02:17:30 -0700 | [diff] [blame] | 74 | } |
| 75 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 76 | #define is_trap(instr) (IS_TW(instr) || IS_TD(instr) || \ |
| 77 | IS_TWI(instr) || IS_TDI(instr)) |
Kumar Gala | 8209003 | 2007-02-06 22:55:19 -0600 | [diff] [blame] | 78 | #else |
| 79 | /* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */ |
Kumar Gala | 8209003 | 2007-02-06 22:55:19 -0600 | [diff] [blame] | 80 | #define is_trap(instr) (IS_TW(instr) || IS_TWI(instr)) |
| 81 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 82 | |
| 83 | #define ARCH_SUPPORTS_KRETPROBES |
Anil S Keshavamurthy | e6f47f9 | 2006-06-26 00:25:29 -0700 | [diff] [blame] | 84 | #define ARCH_INACTIVE_KPROBE_COUNT 1 |
bibo, mao | a9ad965 | 2006-07-30 03:03:26 -0700 | [diff] [blame] | 85 | #define flush_insn_slot(p) do { } while (0) |
Anil S Keshavamurthy | e6f47f9 | 2006-06-26 00:25:29 -0700 | [diff] [blame] | 86 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 87 | void kretprobe_trampoline(void); |
Ananth N Mavinakayanahalli | 0498b63 | 2006-01-09 20:52:46 -0800 | [diff] [blame] | 88 | extern void arch_remove_kprobe(struct kprobe *p); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 89 | |
| 90 | /* Architecture specific copy of original instruction */ |
| 91 | struct arch_specific_insn { |
| 92 | /* copy of original instruction */ |
| 93 | kprobe_opcode_t *insn; |
Ananth N Mavinakayanahalli | e6349a9 | 2007-04-18 15:57:51 +1000 | [diff] [blame] | 94 | /* |
| 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | }; |
| 100 | |
Ananth N Mavinakayanahalli | 0dc036c | 2005-11-07 01:00:10 -0800 | [diff] [blame] | 101 | struct prev_kprobe { |
| 102 | struct kprobe *kp; |
| 103 | unsigned long status; |
| 104 | unsigned long saved_msr; |
| 105 | }; |
| 106 | |
| 107 | /* per-cpu kprobe control block */ |
| 108 | struct 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 115 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
Anil S Keshavamurthy | 41dead4 | 2006-01-09 20:52:42 -0800 | [diff] [blame] | 116 | unsigned long val, void *data); |
Christoph Hellwig | 9f90b99 | 2007-04-30 11:56:46 +0100 | [diff] [blame] | 117 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 118 | #endif /* __KERNEL__ */ |
Stephen Rothwell | bbeb3f4 | 2005-09-27 13:51:59 +1000 | [diff] [blame] | 119 | #endif /* _ASM_POWERPC_KPROBES_H */ |