kprobes.h

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#ifndef _ASM_KPROBES_H
#define _ASM_KPROBES_H
/*
 *  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
 * Copyright (C) Intel Corporation, 2005
 *
 * 2005-Apr     Rusty Lynch <[email protected]> and Anil S Keshavamurthy
 *              <[email protected]> adapted from i386
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>
#include <asm/break.h>

#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE   2   /* last half is for kprobe-booster */
#define BREAK_INST  (long)(__IA64_BREAK_KPROBE << 6)
#define NOP_M_INST  (long)(1<<27)
#define BRL_INST(i1, i2) ((long)((0xcL << 37) | /* brl */ \
                (0x1L << 12) |  /* many */ \
                (((i1) & 1) << 36) | ((i2) << 13))) /* imm */

typedef union cmp_inst {
    struct {
    unsigned long long qp : 6;
    unsigned long long p1 : 6;
    unsigned long long c  : 1;
    unsigned long long r2 : 7;
    unsigned long long r3 : 7;
    unsigned long long p2 : 6;
    unsigned long long ta : 1;
    unsigned long long x2 : 2;
    unsigned long long tb : 1;
    unsigned long long opcode : 4;
    unsigned long long reserved : 23;
    }f;
    unsigned long long l;
} cmp_inst_t;

struct kprobe;

typedef struct _bundle {
    struct {
        unsigned long long template : 5;
        unsigned long long slot0 : 41;
        unsigned long long slot1_p0 : 64-46;
    } quad0;
    struct {
        unsigned long long slot1_p1 : 41 - (64-46);
        unsigned long long slot2 : 41;
    } quad1;
} __attribute__((__aligned__(16)))  bundle_t;

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

#define MAX_PARAM_RSE_SIZE  (0x60+0x60/0x3f)
/* per-cpu kprobe control block */
#define ARCH_PREV_KPROBE_SZ 2
struct kprobe_ctlblk {
    unsigned long kprobe_status;
    struct pt_regs jprobe_saved_regs;
    unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
    unsigned long *bsp;
    unsigned long cfm;
    atomic_t prev_kprobe_index;
    struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
};

#define kretprobe_blacklist_size 0

#define SLOT0_OPCODE_SHIFT  (37)
#define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
#define SLOT2_OPCODE_SHIFT  (37)

#define INDIRECT_CALL_OPCODE        (1)
#define IP_RELATIVE_CALL_OPCODE     (5)
#define IP_RELATIVE_BRANCH_OPCODE   (4)
#define IP_RELATIVE_PREDICT_OPCODE  (7)
#define LONG_BRANCH_OPCODE      (0xC)
#define LONG_CALL_OPCODE        (0xD)
#define flush_insn_slot(p)      do { } while (0)

typedef struct kprobe_opcode {
    bundle_t bundle;
} kprobe_opcode_t;

/* Architecture specific copy of original instruction*/
struct arch_specific_insn {
    /* copy of the instruction to be emulated */
    kprobe_opcode_t *insn;
 #define INST_FLAG_FIX_RELATIVE_IP_ADDR     1
 #define INST_FLAG_FIX_BRANCH_REG       2
 #define INST_FLAG_BREAK_INST           4
 #define INST_FLAG_BOOSTABLE            8
    unsigned long inst_flag;
    unsigned short target_br_reg;
    unsigned short slot;
};

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

extern void invalidate_stacked_regs(void);
extern void flush_register_stack(void);
extern void arch_remove_kprobe(struct kprobe *p);

#endif              /* _ASM_KPROBES_H */