include/asm-x86_64/kprobes.h

   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
  32 struct pt_regs;
  33 struct kprobe;
  34
  35 typedef 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
  47 void kretprobe_trampoline(void);
  48 extern void arch_remove_kprobe(struct kprobe *p);
  49
  50 /* Architecture specific copy of original instruction*/
  51 struct arch_specific_insn {
  52         /* copy of the original instruction */
  53         kprobe_opcode_t *insn;
  54 };
  55
  56 struct prev_kprobe {
  57         struct kprobe *kp;
  58         unsigned long status;
  59         unsigned long old_rflags;
  60         unsigned long saved_rflags;
  61 };
  62
  63 /* per-cpu kprobe control block */
  64 struct kprobe_ctlblk {
  65         unsigned long kprobe_status;
  66         unsigned long kprobe_old_rflags;
  67         unsigned long kprobe_saved_rflags;
  68         long *jprobe_saved_rsp;
  69         struct pt_regs jprobe_saved_regs;
  70         kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
  71         struct prev_kprobe prev_kprobe;
  72 };
  73
  74 /* trap3/1 are intr gates for kprobes.  So, restore the status of IF,
  75  * if necessary, before executing the original int3/1 (trap) handler.
  76  */
  77 static inline void restore_interrupts(struct pt_regs *regs)
  78 {
  79         if (regs->eflags & IF_MASK)
  80                 local_irq_enable();
  81 }
  82
  83 extern int post_kprobe_handler(struct pt_regs *regs);
  84 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  85 extern int kprobe_handler(struct pt_regs *regs);
  86
  87 extern int kprobe_exceptions_notify(struct notifier_block *self,
  88                                     unsigned long val, void *data);
  89 #endif                          /* _ASM_KPROBES_H */