include/asm-powerpc/kprobes.h

   1 #ifndef _ASM_POWERPC_KPROBES_H
   2 #define _ASM_POWERPC_KPROBES_H
   3 /*
   4  *  Kernel Probes (KProbes)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  * Copyright (C) IBM Corporation, 2002, 2004
  21  *
  22  * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
  23  *              Probes initial implementation ( includes suggestions from
  24  *              Rusty Russell).
  25  * 2004-Nov     Modified for PPC64 by Ananth N Mavinakayanahalli
  26  *              <ananth@in.ibm.com>
  27  */
  28 #include <linux/types.h>
  29 #include <linux/ptrace.h>
  30
  31 struct pt_regs;
  32
  33 typedef unsigned int kprobe_opcode_t;
  34 #define BREAKPOINT_INSTRUCTION  0x7fe00008      /* trap */
  35 #define MAX_INSN_SIZE 1
  36
  37 #define IS_TW(instr)            (((instr) & 0xfc0007fe) == 0x7c000008)
  38 #define IS_TD(instr)            (((instr) & 0xfc0007fe) == 0x7c000088)
  39 #define IS_TDI(instr)           (((instr) & 0xfc000000) == 0x08000000)
  40 #define IS_TWI(instr)           (((instr) & 0xfc000000) == 0x0c000000)
  41
  42 #define JPROBE_ENTRY(pentry)    (kprobe_opcode_t *)((func_descr_t *)pentry)
  43
  44 #define is_trap(instr)  (IS_TW(instr) || IS_TD(instr) || \
  45                         IS_TWI(instr) || IS_TDI(instr))
  46
  47 #define ARCH_SUPPORTS_KRETPROBES
  48 void kretprobe_trampoline(void);
  49
  50 /* Architecture specific copy of original instruction */
  51 struct arch_specific_insn {
  52         /* copy of original instruction */
  53         kprobe_opcode_t *insn;
  54 };
  55
  56 #ifdef CONFIG_KPROBES
  57 extern int kprobe_exceptions_notify(struct notifier_block *self,
  58                                     unsigned long val, void *data);
  59 #else                           /* !CONFIG_KPROBES */
  60 static inline int kprobe_exceptions_notify(struct notifier_block *self,
  61                                            unsigned long val, void *data)
  62 {
  63         return 0;
  64 }
  65 #endif
  66 #endif  /* _ASM_POWERPC_KPROBES_H */