include/asm-ppc64/kprobes.h

   1 #ifndef _ASM_KPROBES_H
   2 #define _ASM_KPROBES_H
   3 /*
   4  *  Kernel Probes (KProbes)
   5  *  include/asm-ppc64/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  * 2004-Nov     Modified for PPC64 by Ananth N Mavinakayanahalli
  27  *              <ananth@in.ibm.com>
  28  */
  29 #include <linux/types.h>
  30 #include <linux/ptrace.h>
  31
  32 struct pt_regs;
  33
  34 typedef unsigned int kprobe_opcode_t;
  35 #define BREAKPOINT_INSTRUCTION  0x7fe00008      /* trap */
  36 #define MAX_INSN_SIZE 1
  37
  38 #define IS_TW(instr)            (((instr) & 0xfc0007fe) == 0x7c000008)
  39 #define IS_TD(instr)            (((instr) & 0xfc0007fe) == 0x7c000088)
  40 #define IS_TDI(instr)           (((instr) & 0xfc000000) == 0x08000000)
  41 #define IS_TWI(instr)           (((instr) & 0xfc000000) == 0x0c000000)
  42
  43 #define JPROBE_ENTRY(pentry)    (kprobe_opcode_t *)((func_descr_t *)pentry)
  44
  45 #define is_trap(instr)  (IS_TW(instr) || IS_TD(instr) || \
  46                         IS_TWI(instr) || IS_TDI(instr))
  47
  48 #define ARCH_SUPPORTS_KRETPROBES
  49 void kretprobe_trampoline(void);
  50
  51 /* Architecture specific copy of original instruction */
  52 struct arch_specific_insn {
  53         /* copy of original instruction */
  54         kprobe_opcode_t *insn;
  55 };
  56
  57 #ifdef CONFIG_KPROBES
  58 extern int kprobe_exceptions_notify(struct notifier_block *self,
  59                                     unsigned long val, void *data);
  60 #else                           /* !CONFIG_KPROBES */
  61 static inline int kprobe_exceptions_notify(struct notifier_block *self,
  62                                            unsigned long val, void *data)
  63 {
  64         return 0;
  65 }
  66 #endif
  67 #endif                          /* _ASM_KPROBES_H */