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 __ARCH_WANT_KPROBES_INSN_SLOT
  33 #define MAX_INSN_SIZE   1
  34 #define BREAK_INST      (long)(__IA64_BREAK_KPROBE << 6)
  35
  36 typedef union cmp_inst {
  37         struct {
  38         unsigned long long qp : 6;
  39         unsigned long long p1 : 6;
  40         unsigned long long c  : 1;
  41         unsigned long long r2 : 7;
  42         unsigned long long r3 : 7;
  43         unsigned long long p2 : 6;
  44         unsigned long long ta : 1;
  45         unsigned long long x2 : 2;
  46         unsigned long long tb : 1;
  47         unsigned long long opcode : 4;
  48         unsigned long long reserved : 23;
  49         }f;
  50         unsigned long long l;
  51 } cmp_inst_t;
  52
  53 struct kprobe;
  54
  55 typedef struct _bundle {
  56         struct {
  57                 unsigned long long template : 5;
  58                 unsigned long long slot0 : 41;
  59                 unsigned long long slot1_p0 : 64-46;
  60         } quad0;
  61         struct {
  62                 unsigned long long slot1_p1 : 41 - (64-46);
  63                 unsigned long long slot2 : 41;
  64         } quad1;
  65 } __attribute__((__aligned__(16)))  bundle_t;
  66
  67 struct prev_kprobe {
  68         struct kprobe *kp;
  69         unsigned long status;
  70 };
  71
  72 #define MAX_PARAM_RSE_SIZE      (0x60+0x60/0x3f)
  73 /* per-cpu kprobe control block */
  74 #define ARCH_PREV_KPROBE_SZ 2
  75 struct kprobe_ctlblk {
  76         unsigned long kprobe_status;
  77         struct pt_regs jprobe_saved_regs;
  78         unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
  79         unsigned long *bsp;
  80         unsigned long cfm;
  81         atomic_t prev_kprobe_index;
  82         struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
  83 };
  84
  85 #define ARCH_SUPPORTS_KRETPROBES
  86 #define  ARCH_INACTIVE_KPROBE_COUNT 1
  87
  88 #define SLOT0_OPCODE_SHIFT      (37)
  89 #define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
  90 #define SLOT2_OPCODE_SHIFT      (37)
  91
  92 #define INDIRECT_CALL_OPCODE            (1)
  93 #define IP_RELATIVE_CALL_OPCODE         (5)
  94 #define IP_RELATIVE_BRANCH_OPCODE       (4)
  95 #define IP_RELATIVE_PREDICT_OPCODE      (7)
  96 #define LONG_BRANCH_OPCODE              (0xC)
  97 #define LONG_CALL_OPCODE                (0xD)
  98 #define flush_insn_slot(p)              do { } while (0)
  99
 100 typedef struct kprobe_opcode {
 101         bundle_t bundle;
 102 } kprobe_opcode_t;
 103
 104 struct fnptr {
 105         unsigned long ip;
 106         unsigned long gp;
 107 };
 108
 109 /* Architecture specific copy of original instruction*/
 110 struct arch_specific_insn {
 111         /* copy of the instruction to be emulated */
 112         kprobe_opcode_t *insn;
 113  #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
 114  #define INST_FLAG_FIX_BRANCH_REG               2
 115  #define INST_FLAG_BREAK_INST                   4
 116         unsigned long inst_flag;
 117         unsigned short target_br_reg;
 118         unsigned short slot;
 119 };
 120
 121 extern int kprobes_fault_handler(struct pt_regs *regs, int trapnr);
 122 extern int kprobe_exceptions_notify(struct notifier_block *self,
 123                                     unsigned long val, void *data);
 124
 125 /* ia64 does not need this */
 126 static inline void jprobe_return(void)
 127 {
 128 }
 129 extern void invalidate_stacked_regs(void);
 130 extern void flush_register_stack(void);
 131 extern void arch_remove_kprobe(struct kprobe *p);
 132
 133 #endif                          /* _ASM_KPROBES_H */