| 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 | |
| 30 | struct pt_regs; |
| 31 | |
| 32 | typedef u8 kprobe_opcode_t; |
| 33 | #define BREAKPOINT_INSTRUCTION 0xcc |
| 34 | #define MAX_INSN_SIZE 16 |
| 35 | #define MAX_STACK_SIZE 64 |
| 36 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ |
| 37 | (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ |
| 38 | ? (MAX_STACK_SIZE) \ |
| 39 | : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) |
| 40 | |
| 41 | #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry |
| Hien Nguyen | b94cce9 | 2005-06-23 00:09:19 -0700 | [diff] [blame] | 42 | #define ARCH_SUPPORTS_KRETPROBES |
| 43 | |
| 44 | void kretprobe_trampoline(void); |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | /* Architecture specific copy of original instruction*/ |
| 47 | struct arch_specific_insn { |
| 48 | /* copy of the original instruction */ |
| 49 | kprobe_opcode_t insn[MAX_INSN_SIZE]; |
| 50 | }; |
| 51 | |
| 52 | |
| 53 | /* trap3/1 are intr gates for kprobes. So, restore the status of IF, |
| 54 | * if necessary, before executing the original int3/1 (trap) handler. |
| 55 | */ |
| 56 | static inline void restore_interrupts(struct pt_regs *regs) |
| 57 | { |
| 58 | if (regs->eflags & IF_MASK) |
| 59 | local_irq_enable(); |
| 60 | } |
| 61 | |
| 62 | #ifdef CONFIG_KPROBES |
| 63 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
| 64 | unsigned long val, void *data); |
| 65 | #else /* !CONFIG_KPROBES */ |
| 66 | static inline int kprobe_exceptions_notify(struct notifier_block *self, |
| 67 | unsigned long val, void *data) |
| 68 | { |
| 69 | return 0; |
| 70 | } |
| 71 | #endif |
| 72 | #endif /* _ASM_KPROBES_H */ |