include/asm-ia64/kprobes.h

   1 #ifndef _ASM_KPROBES_H
   2 #define _ASM_KPROBES_H
   3 /*
   4  *  Kernel Probes (KProbes)
   5  *  include/asm-ia64/kprobes.h
   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  * Copyright (C) Intel Corporation, 2005
  23  *
  24  * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
  25  *              <anil.s.keshavamurthy@intel.com> adapted from i386
  26  */
  27 #include <linux/types.h>
  28 #include <linux/ptrace.h>
  29 #include <asm/break.h>
  30
  31 #define MAX_INSN_SIZE   16
  32 #define BREAK_INST      (long)(__IA64_BREAK_KPROBE << 6)
  33
  34 typedef union cmp_inst {
  35         struct {
  36         unsigned long long qp : 6;
  37         unsigned long long p1 : 6;
  38         unsigned long long c  : 1;
  39         unsigned long long r2 : 7;
  40         unsigned long long r3 : 7;
  41         unsigned long long p2 : 6;
  42         unsigned long long ta : 1;
  43         unsigned long long x2 : 2;
  44         unsigned long long tb : 1;
  45         unsigned long long opcode : 4;
  46         unsigned long long reserved : 23;
  47         }f;
  48         unsigned long long l;
  49 } cmp_inst_t;
  50
  51 struct kprobe;
  52
  53 typedef struct _bundle {
  54         struct {
  55                 unsigned long long template : 5;
  56                 unsigned long long slot0 : 41;
  57                 unsigned long long slot1_p0 : 64-46;
  58         } quad0;
  59         struct {
  60                 unsigned long long slot1_p1 : 41 - (64-46);
  61                 unsigned long long slot2 : 41;
  62         } quad1;
  63 } __attribute__((__aligned__(16)))  bundle_t;
  64
  65 #define JPROBE_ENTRY(pentry)    (kprobe_opcode_t *)pentry
  66
  67 #define ARCH_SUPPORTS_KRETPROBES
  68
  69 #define SLOT0_OPCODE_SHIFT      (37)
  70 #define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
  71 #define SLOT2_OPCODE_SHIFT      (37)
  72
  73 #define INDIRECT_CALL_OPCODE            (1)
  74 #define IP_RELATIVE_CALL_OPCODE         (5)
  75 #define IP_RELATIVE_BRANCH_OPCODE       (4)
  76 #define IP_RELATIVE_PREDICT_OPCODE      (7)
  77 #define LONG_BRANCH_OPCODE              (0xC)
  78 #define LONG_CALL_OPCODE                (0xD)
  79
  80 typedef struct kprobe_opcode {
  81         bundle_t bundle;
  82 } kprobe_opcode_t;
  83
  84 struct fnptr {
  85         unsigned long ip;
  86         unsigned long gp;
  87 };
  88
  89 /* Architecture specific copy of original instruction*/
  90 struct arch_specific_insn {
  91         /* copy of the instruction to be emulated */
  92         kprobe_opcode_t insn;
  93  #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
  94  #define INST_FLAG_FIX_BRANCH_REG               2
  95  #define INST_FLAG_BREAK_INST                   4
  96         unsigned long inst_flag;
  97         unsigned short target_br_reg;
  98 };
  99
 100 /* ia64 does not need this */
 101 static inline void arch_copy_kprobe(struct kprobe *p)
 102 {
 103 }
 104
 105 #ifdef CONFIG_KPROBES
 106 extern int kprobe_exceptions_notify(struct notifier_block *self,
 107                                     unsigned long val, void *data);
 108
 109 /* ia64 does not need this */
 110 static inline void jprobe_return(void)
 111 {
 112 }
 113
 114 #else                           /* !CONFIG_KPROBES */
 115 static inline int kprobe_exceptions_notify(struct notifier_block *self,
 116                                            unsigned long val, void *data)
 117 {
 118         return 0;
 119 }
 120 #endif
 121 #endif                          /* _ASM_KPROBES_H */