LXR linux/arch/ia64/include/asm/kprobes.h

   1#ifndef _ASM_KPROBES_H
   2#define _ASM_KPROBES_H
   3/*
   4 *  Kernel Probes (KProbes)
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 *
  20 * Copyright (C) IBM Corporation, 2002, 2004
  21 * Copyright (C) Intel Corporation, 2005
  22 *
  23 * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
  24 *              <anil.s.keshavamurthy@intel.com> adapted from i386
  25 */
  26#include <linux/types.h>
  27#include <linux/ptrace.h>
  28#include <linux/percpu.h>
  29#include <asm/break.h>
  30
  31#define __ARCH_WANT_KPROBES_INSN_SLOT
  32#define MAX_INSN_SIZE   2       /* last half is for kprobe-booster */
  33#define BREAK_INST      (long)(__IA64_BREAK_KPROBE << 6)
  34#define NOP_M_INST      (long)(1<<27)
  35#define BRL_INST(i1, i2) ((long)((0xcL << 37) | /* brl */ \
  36                                (0x1L << 12) |  /* many */ \
  37                                (((i1) & 1) << 36) | ((i2) << 13))) /* imm */
  38
  39typedef union cmp_inst {
  40        struct {
  41        unsigned long long qp : 6;
  42        unsigned long long p1 : 6;
  43        unsigned long long c  : 1;
  44        unsigned long long r2 : 7;
  45        unsigned long long r3 : 7;
  46        unsigned long long p2 : 6;
  47        unsigned long long ta : 1;
  48        unsigned long long x2 : 2;
  49        unsigned long long tb : 1;
  50        unsigned long long opcode : 4;
  51        unsigned long long reserved : 23;
  52        }f;
  53        unsigned long long l;
  54} cmp_inst_t;
  55
  56struct kprobe;
  57
  58typedef struct _bundle {
  59        struct {
  60                unsigned long long template : 5;
  61                unsigned long long slot0 : 41;
  62                unsigned long long slot1_p0 : 64-46;
  63        } quad0;
  64        struct {
  65                unsigned long long slot1_p1 : 41 - (64-46);
  66                unsigned long long slot2 : 41;
  67        } quad1;
  68} __attribute__((__aligned__(16)))  bundle_t;
  69
  70struct prev_kprobe {
  71        struct kprobe *kp;
  72        unsigned long status;
  73};
  74
  75#define MAX_PARAM_RSE_SIZE      (0x60+0x60/0x3f)
  76/* per-cpu kprobe control block */
  77#define ARCH_PREV_KPROBE_SZ 2
  78struct kprobe_ctlblk {
  79        unsigned long kprobe_status;
  80        struct pt_regs jprobe_saved_regs;
  81        unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
  82        unsigned long *bsp;
  83        unsigned long cfm;
  84        atomic_t prev_kprobe_index;
  85        struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
  86};
  87
  88#define kretprobe_blacklist_size 0
  89
  90#define SLOT0_OPCODE_SHIFT      (37)
  91#define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
  92#define SLOT2_OPCODE_SHIFT      (37)
  93
  94#define INDIRECT_CALL_OPCODE            (1)
  95#define IP_RELATIVE_CALL_OPCODE         (5)
  96#define IP_RELATIVE_BRANCH_OPCODE       (4)
  97#define IP_RELATIVE_PREDICT_OPCODE      (7)
  98#define LONG_BRANCH_OPCODE              (0xC)
  99#define LONG_CALL_OPCODE                (0xD)
 100#define flush_insn_slot(p)              do { } while (0)
 101
 102typedef struct kprobe_opcode {
 103        bundle_t bundle;
 104} kprobe_opcode_t;
 105
 106/* Architecture specific copy of original instruction*/
 107struct arch_specific_insn {
 108        /* copy of the instruction to be emulated */
 109        kprobe_opcode_t *insn;
 110 #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
 111 #define INST_FLAG_FIX_BRANCH_REG               2
 112 #define INST_FLAG_BREAK_INST                   4
 113 #define INST_FLAG_BOOSTABLE                    8
 114        unsigned long inst_flag;
 115        unsigned short target_br_reg;
 116        unsigned short slot;
 117};
 118
 119extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 120extern int kprobe_exceptions_notify(struct notifier_block *self,
 121                                    unsigned long val, void *data);
 122
 123extern void invalidate_stacked_regs(void);
 124extern void flush_register_stack(void);
 125extern void arch_remove_kprobe(struct kprobe *p);
 126
 127#endif                          /* _ASM_KPROBES_H */
 128