include/asm-i386/kprobes.h

   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
  32 struct kprobe;
  33 struct pt_regs;
  34
  35 typedef 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 ARCH_SUPPORTS_KRETPROBES
  46 #define  ARCH_INACTIVE_KPROBE_COUNT 0
  47 #define flush_insn_slot(p)      do { } while (0)
  48
  49 void arch_remove_kprobe(struct kprobe *p);
  50 void kretprobe_trampoline(void);
  51
  52 /* Architecture specific copy of original instruction*/
  53 struct arch_specific_insn {
  54         /* copy of the original instruction */
  55         kprobe_opcode_t *insn;
  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;
  61 };
  62
  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 };
  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
  90 extern int kprobe_exceptions_notify(struct notifier_block *self,
  91                                     unsigned long val, void *data);
  92 #endif                          /* _ASM_KPROBES_H */