1#ifndef _ASM_KPROBES_H 2#define _ASM_KPROBES_H 3/* 4 * Kernel Probes (KProbes) 5 * include/asm-x86_64/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 * 2004-Oct Prasanna S Panchamukhi <prasanna@in.ibm.com> and Jim Keniston 24 * kenistoj@us.ibm.com adopted from i386. 25 */ 26#include <linux/types.h> 27#include <linux/ptrace.h> 28#include <linux/percpu.h> 29 30#define __ARCH_WANT_KPROBES_INSN_SLOT 31 32struct pt_regs; 33struct kprobe; 34 35typedef u8 kprobe_opcode_t; 36#define BREAKPOINT_INSTRUCTION 0xcc 37#define MAX_INSN_SIZE 15 38#define MAX_STACK_SIZE 64 39#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ 40 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ 41 ? (MAX_STACK_SIZE) \ 42 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) 43 44#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry 45#define ARCH_SUPPORTS_KRETPROBES 46#define ARCH_INACTIVE_KPROBE_COUNT 1 47 48void kretprobe_trampoline(void); 49extern void arch_remove_kprobe(struct kprobe *p); 50#define flush_insn_slot(p) do { } while (0) 51 52/* Architecture specific copy of original instruction*/ 53struct arch_specific_insn { 54 /* copy of the original instruction */ 55 kprobe_opcode_t *insn; 56}; 57 58struct prev_kprobe { 59 struct kprobe *kp; 60 unsigned long status; 61 unsigned long old_rflags; 62 unsigned long saved_rflags; 63}; 64 65/* per-cpu kprobe control block */ 66struct kprobe_ctlblk { 67 unsigned long kprobe_status; 68 unsigned long kprobe_old_rflags; 69 unsigned long kprobe_saved_rflags; 70 long *jprobe_saved_rsp; 71 struct pt_regs jprobe_saved_regs; 72 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 73 struct prev_kprobe prev_kprobe; 74}; 75 76/* trap3/1 are intr gates for kprobes. So, restore the status of IF, 77 * if necessary, before executing the original int3/1 (trap) handler. 78 */ 79static inline void restore_interrupts(struct pt_regs *regs) 80{ 81 if (regs->eflags & IF_MASK) 82 local_irq_enable(); 83} 84 85extern int post_kprobe_handler(struct pt_regs *regs); 86extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 87extern int kprobe_handler(struct pt_regs *regs); 88 89extern int kprobe_exceptions_notify(struct notifier_block *self, 90 unsigned long val, void *data); 91#endif /* _ASM_KPROBES_H */ 92