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kprobes.h

#ifndef _ASM_POWERPC_KPROBES_H
#define _ASM_POWERPC_KPROBES_H
#ifdef __KERNEL__
/*
 *  Kernel Probes (KProbes)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2002, 2004
 *
 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *          Probes initial implementation ( includes suggestions from
 *          Rusty Russell).
 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
 *          <ananth@in.ibm.com>
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef unsigned int kprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION      0x7fe00008  /* trap */
#define MAX_INSN_SIZE 1

#define IS_TW(instr)          (((instr) & 0xfc0007fe) == 0x7c000008)
#define IS_TD(instr)          (((instr) & 0xfc0007fe) == 0x7c000088)
#define IS_TDI(instr)         (((instr) & 0xfc000000) == 0x08000000)
#define IS_TWI(instr)         (((instr) & 0xfc000000) == 0x0c000000)

#ifdef CONFIG_PPC64
/*
 * 64bit powerpc uses function descriptors.
 * Handle cases where:
 *          - User passes a <.symbol> or <module:.symbol>
 *          - User passes a <symbol> or <module:symbol>
 *          - User passes a non-existant symbol, kallsyms_lookup_name
 *            returns 0. Don't deref the NULL pointer in that case
 */
#define kprobe_lookup_name(name, addr)                            \
{                                                     \
      addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);       \
      if (addr) {                                     \
            char *colon;                                    \
            if ((colon = strchr(name, ':')) != NULL) {            \
                  colon++;                            \
                  if (*colon != '\0' && *colon != '.')            \
                        addr = *(kprobe_opcode_t **)addr;   \
            } else if (name[0] != '.')                      \
                  addr = *(kprobe_opcode_t **)addr;         \
      } else {                                        \
            char dot_name[KSYM_NAME_LEN];                   \
            dot_name[0] = '.';                              \
            dot_name[1] = '\0';                             \
            strncat(dot_name, name, KSYM_NAME_LEN - 2);           \
            addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
      }                                               \
}

#define is_trap(instr)  (IS_TW(instr) || IS_TD(instr) || \
                  IS_TWI(instr) || IS_TDI(instr))
#else
/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
#define is_trap(instr)  (IS_TW(instr) || IS_TWI(instr))
#endif

#define flush_insn_slot(p)    do { } while (0)
#define kretprobe_blacklist_size 0

void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);

/* Architecture specific copy of original instruction */
struct arch_specific_insn {
      /* copy of original instruction */
      kprobe_opcode_t *insn;
      /*
       * Set in kprobes code, initially to 0. If the instruction can be
       * eumulated, this is set to 1, if not, to -1.
       */
      int boostable;
};

struct prev_kprobe {
      struct kprobe *kp;
      unsigned long status;
      unsigned long saved_msr;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
      unsigned long kprobe_status;
      unsigned long kprobe_saved_msr;
      struct pt_regs jprobe_saved_regs;
      struct prev_kprobe prev_kprobe;
};

extern int kprobe_exceptions_notify(struct notifier_block *self,
                              unsigned long val, void *data);
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
#endif /* __KERNEL__ */
#endif      /* _ASM_POWERPC_KPROBES_H */

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