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 #include <linux/percpu.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 struct prev_kprobe {
  58         struct kprobe *kp;
  59         unsigned long status;
  60         unsigned long saved_msr;
  61 };
  62
  63 /* per-cpu kprobe control block */
  64 struct kprobe_ctlblk {
  65         unsigned long kprobe_status;
  66         unsigned long kprobe_saved_msr;
  67         struct pt_regs jprobe_saved_regs;
  68         struct prev_kprobe prev_kprobe;
  69 };
  70
  71 #ifdef CONFIG_KPROBES
  72 extern int kprobe_exceptions_notify(struct notifier_block *self,
  73                                     unsigned long val, void *data);
  74 #else                           /* !CONFIG_KPROBES */
  75 static inline int kprobe_exceptions_notify(struct notifier_block *self,
  76                                            unsigned long val, void *data)
  77 {
  78         return 0;
  79 }
  80 #endif
  81 #endif  /* _ASM_POWERPC_KPROBES_H */