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Linux/arch/ia64/include/asm/kprobes.h

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  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 */
128 

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