kprobes.h

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#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 <[email protected]> Kernel
 *      Probes initial implementation ( includes suggestions from
 *      Rusty Russell).
 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
 *      <[email protected]>
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>
#include <asm/probes.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef ppc_opcode_t kprobe_opcode_t;
#define MAX_INSN_SIZE 1

#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-existent 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); \
    }                               \
}
#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 */