LXR linux/arch/powerpc/include/asm/kprobes.h

   1#ifndef _ASM_POWERPC_KPROBES_H
   2#define _ASM_POWERPC_KPROBES_H
   3
   4#include <asm-generic/kprobes.h>
   5
   6#ifdef __KERNEL__
   7/*
   8 *  Kernel Probes (KProbes)
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23 *
  24 * Copyright (C) IBM Corporation, 2002, 2004
  25 *
  26 * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
  27 *              Probes initial implementation ( includes suggestions from
  28 *              Rusty Russell).
  29 * 2004-Nov     Modified for PPC64 by Ananth N Mavinakayanahalli
  30 *              <ananth@in.ibm.com>
  31 */
  32#include <linux/types.h>
  33#include <linux/ptrace.h>
  34#include <linux/percpu.h>
  35#include <linux/module.h>
  36#include <asm/probes.h>
  37#include <asm/code-patching.h>
  38
  39#ifdef CONFIG_KPROBES
  40#define  __ARCH_WANT_KPROBES_INSN_SLOT
  41
  42struct pt_regs;
  43struct kprobe;
  44
  45typedef ppc_opcode_t kprobe_opcode_t;
  46
  47extern kprobe_opcode_t optinsn_slot;
  48
  49/* Optinsn template address */
  50extern kprobe_opcode_t optprobe_template_entry[];
  51extern kprobe_opcode_t optprobe_template_op_address[];
  52extern kprobe_opcode_t optprobe_template_call_handler[];
  53extern kprobe_opcode_t optprobe_template_insn[];
  54extern kprobe_opcode_t optprobe_template_call_emulate[];
  55extern kprobe_opcode_t optprobe_template_ret[];
  56extern kprobe_opcode_t optprobe_template_end[];
  57
  58/* Fixed instruction size for powerpc */
  59#define MAX_INSN_SIZE           1
  60#define MAX_OPTIMIZED_LENGTH    sizeof(kprobe_opcode_t) /* 4 bytes */
  61#define MAX_OPTINSN_SIZE        (optprobe_template_end - optprobe_template_entry)
  62#define RELATIVEJUMP_SIZE       sizeof(kprobe_opcode_t) /* 4 bytes */
  63
  64#define flush_insn_slot(p)      do { } while (0)
  65#define kretprobe_blacklist_size 0
  66
  67void kretprobe_trampoline(void);
  68extern void arch_remove_kprobe(struct kprobe *p);
  69
  70/* Architecture specific copy of original instruction */
  71struct arch_specific_insn {
  72        /* copy of original instruction */
  73        kprobe_opcode_t *insn;
  74        /*
  75         * Set in kprobes code, initially to 0. If the instruction can be
  76         * eumulated, this is set to 1, if not, to -1.
  77         */
  78        int boostable;
  79};
  80
  81struct prev_kprobe {
  82        struct kprobe *kp;
  83        unsigned long status;
  84        unsigned long saved_msr;
  85};
  86
  87/* per-cpu kprobe control block */
  88struct kprobe_ctlblk {
  89        unsigned long kprobe_status;
  90        unsigned long kprobe_saved_msr;
  91        struct prev_kprobe prev_kprobe;
  92};
  93
  94struct arch_optimized_insn {
  95        kprobe_opcode_t copied_insn[1];
  96        /* detour buffer */
  97        kprobe_opcode_t *insn;
  98};
  99
 100extern int kprobe_exceptions_notify(struct notifier_block *self,
 101                                        unsigned long val, void *data);
 102extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 103extern int kprobe_handler(struct pt_regs *regs);
 104extern int kprobe_post_handler(struct pt_regs *regs);
 105#else
 106static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
 107static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
 108#endif /* CONFIG_KPROBES */
 109#endif /* __KERNEL__ */
 110#endif  /* _ASM_POWERPC_KPROBES_H */
 111