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 <asm-generic/kprobes.h>
  27 #include <asm/break.h>
  28
  29 #define BREAK_INST      (long)(__IA64_BREAK_KPROBE << 6)
  30
  31 #ifdef CONFIG_KPROBES
  32
  33 #include <linux/types.h>
  34 #include <linux/ptrace.h>
  35 #include <linux/percpu.h>
  36
  37 #define __ARCH_WANT_KPROBES_INSN_SLOT
  38 #define MAX_INSN_SIZE   2       /* last half is for kprobe-booster */
  39 #define NOP_M_INST      (long)(1<<27)
  40 #define BRL_INST(i1, i2) ((long)((0xcL << 37) | /* brl */ \
  41                                 (0x1L << 12) |  /* many */ \
  42                                 (((i1) & 1) << 36) | ((i2) << 13))) /* imm */
  43
  44 typedef union cmp_inst {
  45         struct {
  46         unsigned long long qp : 6;
  47         unsigned long long p1 : 6;
  48         unsigned long long c  : 1;
  49         unsigned long long r2 : 7;
  50         unsigned long long r3 : 7;
  51         unsigned long long p2 : 6;
  52         unsigned long long ta : 1;
  53         unsigned long long x2 : 2;
  54         unsigned long long tb : 1;
  55         unsigned long long opcode : 4;
  56         unsigned long long reserved : 23;
  57         }f;
  58         unsigned long long l;
  59 } cmp_inst_t;
  60
  61 struct kprobe;
  62
  63 typedef struct _bundle {
  64         struct {
  65                 unsigned long long template : 5;
  66                 unsigned long long slot0 : 41;
  67                 unsigned long long slot1_p0 : 64-46;
  68         } quad0;
  69         struct {
  70                 unsigned long long slot1_p1 : 41 - (64-46);
  71                 unsigned long long slot2 : 41;
  72         } quad1;
  73 } __attribute__((__aligned__(16)))  bundle_t;
  74
  75 struct prev_kprobe {
  76         struct kprobe *kp;
  77         unsigned long status;
  78 };
  79
  80 #define MAX_PARAM_RSE_SIZE      (0x60+0x60/0x3f)
  81 /* per-cpu kprobe control block */
  82 #define ARCH_PREV_KPROBE_SZ 2
  83 struct kprobe_ctlblk {
  84         unsigned long kprobe_status;
  85         struct pt_regs jprobe_saved_regs;
  86         unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
  87         unsigned long *bsp;
  88         unsigned long cfm;
  89         atomic_t prev_kprobe_index;
  90         struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
  91 };
  92
  93 #define kretprobe_blacklist_size 0
  94
  95 #define SLOT0_OPCODE_SHIFT      (37)
  96 #define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
  97 #define SLOT2_OPCODE_SHIFT      (37)
  98
  99 #define INDIRECT_CALL_OPCODE            (1)
 100 #define IP_RELATIVE_CALL_OPCODE         (5)
 101 #define IP_RELATIVE_BRANCH_OPCODE       (4)
 102 #define IP_RELATIVE_PREDICT_OPCODE      (7)
 103 #define LONG_BRANCH_OPCODE              (0xC)
 104 #define LONG_CALL_OPCODE                (0xD)
 105 #define flush_insn_slot(p)              do { } while (0)
 106
 107 typedef struct kprobe_opcode {
 108         bundle_t bundle;
 109 } kprobe_opcode_t;
 110
 111 /* Architecture specific copy of original instruction*/
 112 struct arch_specific_insn {
 113         /* copy of the instruction to be emulated */
 114         kprobe_opcode_t *insn;
 115  #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
 116  #define INST_FLAG_FIX_BRANCH_REG               2
 117  #define INST_FLAG_BREAK_INST                   4
 118  #define INST_FLAG_BOOSTABLE                    8
 119         unsigned long inst_flag;
 120         unsigned short target_br_reg;
 121         unsigned short slot;
 122 };
 123
 124 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 125 extern int kprobe_exceptions_notify(struct notifier_block *self,
 126                                     unsigned long val, void *data);
 127
 128 extern void invalidate_stacked_regs(void);
 129 extern void flush_register_stack(void);
 130 extern void arch_remove_kprobe(struct kprobe *p);
 131
 132 #endif /* CONFIG_KPROBES */
 133 #endif /* _ASM_KPROBES_H */