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 <linux/percpu.h>
  30 #include <asm/break.h>
  31
  32 #define MAX_INSN_SIZE   16
  33 #define BREAK_INST      (long)(__IA64_BREAK_KPROBE << 6)
  34
  35 typedef union cmp_inst {
  36         struct {
  37         unsigned long long qp : 6;
  38         unsigned long long p1 : 6;
  39         unsigned long long c  : 1;
  40         unsigned long long r2 : 7;
  41         unsigned long long r3 : 7;
  42         unsigned long long p2 : 6;
  43         unsigned long long ta : 1;
  44         unsigned long long x2 : 2;
  45         unsigned long long tb : 1;
  46         unsigned long long opcode : 4;
  47         unsigned long long reserved : 23;
  48         }f;
  49         unsigned long long l;
  50 } cmp_inst_t;
  51
  52 struct kprobe;
  53
  54 typedef struct _bundle {
  55         struct {
  56                 unsigned long long template : 5;
  57                 unsigned long long slot0 : 41;
  58                 unsigned long long slot1_p0 : 64-46;
  59         } quad0;
  60         struct {
  61                 unsigned long long slot1_p1 : 41 - (64-46);
  62                 unsigned long long slot2 : 41;
  63         } quad1;
  64 } __attribute__((__aligned__(16)))  bundle_t;
  65
  66 struct prev_kprobe {
  67         struct kprobe *kp;
  68         unsigned long status;
  69 };
  70
  71 /* per-cpu kprobe control block */
  72 struct kprobe_ctlblk {
  73         unsigned long kprobe_status;
  74         struct pt_regs jprobe_saved_regs;
  75         struct prev_kprobe prev_kprobe;
  76 };
  77
  78 #define JPROBE_ENTRY(pentry)    (kprobe_opcode_t *)pentry
  79
  80 #define ARCH_SUPPORTS_KRETPROBES
  81
  82 #define SLOT0_OPCODE_SHIFT      (37)
  83 #define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
  84 #define SLOT2_OPCODE_SHIFT      (37)
  85
  86 #define INDIRECT_CALL_OPCODE            (1)
  87 #define IP_RELATIVE_CALL_OPCODE         (5)
  88 #define IP_RELATIVE_BRANCH_OPCODE       (4)
  89 #define IP_RELATIVE_PREDICT_OPCODE      (7)
  90 #define LONG_BRANCH_OPCODE              (0xC)
  91 #define LONG_CALL_OPCODE                (0xD)
  92
  93 typedef struct kprobe_opcode {
  94         bundle_t bundle;
  95 } kprobe_opcode_t;
  96
  97 struct fnptr {
  98         unsigned long ip;
  99         unsigned long gp;
 100 };
 101
 102 /* Architecture specific copy of original instruction*/
 103 struct arch_specific_insn {
 104         /* copy of the instruction to be emulated */
 105         kprobe_opcode_t insn;
 106  #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
 107  #define INST_FLAG_FIX_BRANCH_REG               2
 108  #define INST_FLAG_BREAK_INST                   4
 109         unsigned long inst_flag;
 110         unsigned short target_br_reg;
 111 };
 112
 113 /* ia64 does not need this */
 114 static inline void arch_copy_kprobe(struct kprobe *p)
 115 {
 116 }
 117
 118 #ifdef CONFIG_KPROBES
 119 extern int kprobe_exceptions_notify(struct notifier_block *self,
 120                                     unsigned long val, void *data);
 121
 122 /* ia64 does not need this */
 123 static inline void jprobe_return(void)
 124 {
 125 }
 126
 127 #else                           /* !CONFIG_KPROBES */
 128 static inline int kprobe_exceptions_notify(struct notifier_block *self,
 129                                            unsigned long val, void *data)
 130 {
 131         return 0;
 132 }
 133 #endif
 134 #endif                          /* _ASM_KPROBES_H */