Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_KPROBES_H |
| 2 | #define _ASM_KPROBES_H |
| 3 | /* |
| 4 | * Kernel Probes (KProbes) |
| 5 | * include/asm-i386/kprobes.h |
| 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 | */ |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/ptrace.h> |
| 29 | |
Prasanna S Panchamukhi | 124d90b | 2006-02-24 13:04:08 -0800 | [diff] [blame] | 30 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
| 31 | |
| 32 | struct kprobe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | struct pt_regs; |
| 34 | |
| 35 | typedef u8 kprobe_opcode_t; |
| 36 | #define BREAKPOINT_INSTRUCTION 0xcc |
Masami Hiramatsu | 311ac88 | 2006-03-26 01:38:17 -0800 | [diff] [blame] | 37 | #define RELATIVEJUMP_INSTRUCTION 0xe9 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #define MAX_INSN_SIZE 16 |
| 39 | #define MAX_STACK_SIZE 64 |
| 40 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ |
| 41 | (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ |
| 42 | ? (MAX_STACK_SIZE) \ |
| 43 | : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) |
| 44 | |
| 45 | #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry |
Hien Nguyen | b94cce9 | 2005-06-23 00:09:19 -0700 | [diff] [blame] | 46 | #define ARCH_SUPPORTS_KRETPROBES |
Anil S Keshavamurthy | e6f47f9 | 2006-06-26 00:25:29 -0700 | [diff] [blame] | 47 | #define ARCH_INACTIVE_KPROBE_COUNT 0 |
Hien Nguyen | b94cce9 | 2005-06-23 00:09:19 -0700 | [diff] [blame] | 48 | |
Prasanna S Panchamukhi | 124d90b | 2006-02-24 13:04:08 -0800 | [diff] [blame] | 49 | void arch_remove_kprobe(struct kprobe *p); |
Hien Nguyen | b94cce9 | 2005-06-23 00:09:19 -0700 | [diff] [blame] | 50 | void kretprobe_trampoline(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /* Architecture specific copy of original instruction*/ |
| 53 | struct arch_specific_insn { |
| 54 | /* copy of the original instruction */ |
Prasanna S Panchamukhi | 124d90b | 2006-02-24 13:04:08 -0800 | [diff] [blame] | 55 | kprobe_opcode_t *insn; |
Masami Hiramatsu | 311ac88 | 2006-03-26 01:38:17 -0800 | [diff] [blame] | 56 | /* |
| 57 | * If this flag is not 0, this kprobe can be boost when its |
| 58 | * post_handler and break_handler is not set. |
| 59 | */ |
| 60 | int boostable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | }; |
| 62 | |
Ananth N Mavinakayanahalli | 9a0e3a8 | 2005-11-07 01:00:08 -0800 | [diff] [blame] | 63 | struct prev_kprobe { |
| 64 | struct kprobe *kp; |
| 65 | unsigned long status; |
| 66 | unsigned long old_eflags; |
| 67 | unsigned long saved_eflags; |
| 68 | }; |
| 69 | |
| 70 | /* per-cpu kprobe control block */ |
| 71 | struct kprobe_ctlblk { |
| 72 | unsigned long kprobe_status; |
| 73 | unsigned long kprobe_old_eflags; |
| 74 | unsigned long kprobe_saved_eflags; |
| 75 | long *jprobe_saved_esp; |
| 76 | struct pt_regs jprobe_saved_regs; |
| 77 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; |
| 78 | struct prev_kprobe prev_kprobe; |
| 79 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /* trap3/1 are intr gates for kprobes. So, restore the status of IF, |
| 82 | * if necessary, before executing the original int3/1 (trap) handler. |
| 83 | */ |
| 84 | static inline void restore_interrupts(struct pt_regs *regs) |
| 85 | { |
| 86 | if (regs->eflags & IF_MASK) |
| 87 | local_irq_enable(); |
| 88 | } |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
| 91 | unsigned long val, void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #endif /* _ASM_KPROBES_H */ |