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

   1#ifndef _ASM_POWERPC_KPROBES_H
   2#define _ASM_POWERPC_KPROBES_H
   3#ifdef __KERNEL__
   4/*
   5 *  Kernel Probes (KProbes)
   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#include <linux/percpu.h>
  32#include <asm/probes.h>
  33#include <asm/code-patching.h>
  34
  35#define  __ARCH_WANT_KPROBES_INSN_SLOT
  36
  37struct pt_regs;
  38struct kprobe;
  39
  40typedef ppc_opcode_t kprobe_opcode_t;
  41#define MAX_INSN_SIZE 1
  42
  43#ifdef CONFIG_PPC64
  44/*
  45 * 64bit powerpc uses function descriptors.
  46 * Handle cases where:
  47 *              - User passes a <.symbol> or <module:.symbol>
  48 *              - User passes a <symbol> or <module:symbol>
  49 *              - User passes a non-existent symbol, kallsyms_lookup_name
  50 *                returns 0. Don't deref the NULL pointer in that case
  51 */
  52#define kprobe_lookup_name(name, addr)                                  \
  53{                                                                       \
  54        addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);           \
  55        if (addr) {                                                     \
  56                char *colon;                                            \
  57                if ((colon = strchr(name, ':')) != NULL) {              \
  58                        colon++;                                        \
  59                        if (*colon != '\0' && *colon != '.')            \
  60                                addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
  61                } else if (name[0] != '.')                              \
  62                        addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
  63        } else {                                                        \
  64                char dot_name[KSYM_NAME_LEN];                           \
  65                dot_name[0] = '.';                                      \
  66                dot_name[1] = '\0';                                     \
  67                strncat(dot_name, name, KSYM_NAME_LEN - 2);             \
  68                addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
  69        }                                                               \
  70}
  71#endif
  72
  73#define flush_insn_slot(p)      do { } while (0)
  74#define kretprobe_blacklist_size 0
  75
  76void kretprobe_trampoline(void);
  77extern void arch_remove_kprobe(struct kprobe *p);
  78
  79/* Architecture specific copy of original instruction */
  80struct arch_specific_insn {
  81        /* copy of original instruction */
  82        kprobe_opcode_t *insn;
  83        /*
  84         * Set in kprobes code, initially to 0. If the instruction can be
  85         * eumulated, this is set to 1, if not, to -1.
  86         */
  87        int boostable;
  88};
  89
  90struct prev_kprobe {
  91        struct kprobe *kp;
  92        unsigned long status;
  93        unsigned long saved_msr;
  94};
  95
  96/* per-cpu kprobe control block */
  97struct kprobe_ctlblk {
  98        unsigned long kprobe_status;
  99        unsigned long kprobe_saved_msr;
 100        struct pt_regs jprobe_saved_regs;
 101        struct prev_kprobe prev_kprobe;
 102};
 103
 104extern int kprobe_exceptions_notify(struct notifier_block *self,
 105                                        unsigned long val, void *data);
 106extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 107#endif /* __KERNEL__ */
 108#endif  /* _ASM_POWERPC_KPROBES_H */
 109