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
  39 typedef 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
  56 struct kprobe;
  57
  58 typedef 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
  70 struct 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
  78 struct 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
 102 typedef struct kprobe_opcode {
 103         bundle_t bundle;
 104 } kprobe_opcode_t;
 105
 106 /* Architecture specific copy of original instruction*/
 107 struct 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
 119 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 120 extern int kprobe_exceptions_notify(struct notifier_block *self,
 121                                     unsigned long val, void *data);
 122
 123 extern void invalidate_stacked_regs(void);
 124 extern void flush_register_stack(void);
 125 extern void arch_remove_kprobe(struct kprobe *p);
 126
 127 #endif                          /* _ASM_KPROBES_H */