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#define __ARCH_WANT_KPROBES_INSN_SLOT 31 32struct kprobe; 33struct pt_regs; 34 35typedef u8 kprobe_opcode_t; 36#define BREAKPOINT_INSTRUCTION 0xcc 37#define RELATIVEJUMP_INSTRUCTION 0xe9 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 46#define ARCH_SUPPORTS_KRETPROBES 47#define ARCH_INACTIVE_KPROBE_COUNT 0 48#define flush_insn_slot(p) do { } while (0) 49 50void arch_remove_kprobe(struct kprobe *p); 51void kretprobe_trampoline(void); 52 53/* Architecture specific copy of original instruction*/ 54struct arch_specific_insn { 55 /* copy of the original instruction */ 56 kprobe_opcode_t *insn; 57 /* 58 * If this flag is not 0, this kprobe can be boost when its 59 * post_handler and break_handler is not set. 60 */ 61 int boostable; 62}; 63 64struct prev_kprobe { 65 struct kprobe *kp; 66 unsigned long status; 67 unsigned long old_eflags; 68 unsigned long saved_eflags; 69}; 70 71/* per-cpu kprobe control block */ 72struct kprobe_ctlblk { 73 unsigned long kprobe_status; 74 unsigned long kprobe_old_eflags; 75 unsigned long kprobe_saved_eflags; 76 long *jprobe_saved_esp; 77 struct pt_regs jprobe_saved_regs; 78 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 79 struct prev_kprobe prev_kprobe; 80}; 81 82/* trap3/1 are intr gates for kprobes. So, restore the status of IF, 83 * if necessary, before executing the original int3/1 (trap) handler. 84 */ 85static inline void restore_interrupts(struct pt_regs *regs) 86{ 87 if (regs->eflags & IF_MASK) 88 local_irq_enable(); 89} 90 91extern int kprobe_exceptions_notify(struct notifier_block *self, 92 unsigned long val, void *data); 93#endif /* _ASM_KPROBES_H */ 94