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kprobes.h
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1 #ifndef _ASM_X86_KPROBES_H
2 #define _ASM_X86_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  *
22  * See arch/x86/kernel/kprobes.c for x86 kprobes history.
23  */
24 #include <linux/types.h>
25 #include <linux/ptrace.h>
26 #include <linux/percpu.h>
27 #include <asm/insn.h>
28 
29 #define __ARCH_WANT_KPROBES_INSN_SLOT
30 #define ARCH_SUPPORTS_KPROBES_ON_FTRACE
31 
32 struct pt_regs;
33 struct kprobe;
34 
35 typedef u8 kprobe_opcode_t;
36 #define BREAKPOINT_INSTRUCTION 0xcc
37 #define RELATIVEJUMP_OPCODE 0xe9
38 #define RELATIVEJUMP_SIZE 5
39 #define RELATIVECALL_OPCODE 0xe8
40 #define RELATIVE_ADDR_SIZE 4
41 #define MAX_STACK_SIZE 64
42 #define MIN_STACK_SIZE(ADDR) \
43  (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \
44  THREAD_SIZE - (unsigned long)(ADDR))) \
45  ? (MAX_STACK_SIZE) \
46  : (((unsigned long)current_thread_info()) + \
47  THREAD_SIZE - (unsigned long)(ADDR)))
48 
49 #define flush_insn_slot(p) do { } while (0)
50 
51 /* optinsn template addresses */
56 #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
57 #define MAX_OPTINSN_SIZE \
58  (((unsigned long)&optprobe_template_end - \
59  (unsigned long)&optprobe_template_entry) + \
60  MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
61 
62 extern const int kretprobe_blacklist_size;
63 
64 void arch_remove_kprobe(struct kprobe *p);
65 void kretprobe_trampoline(void);
66 
67 /* Architecture specific copy of original instruction*/
68 struct arch_specific_insn {
69  /* copy of the original instruction */
71  /*
72  * boostable = -1: This instruction type is not boostable.
73  * boostable = 0: This instruction type is boostable.
74  * boostable = 1: This instruction has been boosted: we have
75  * added a relative jump after the instruction copy in insn,
76  * so no single-step and fixup are needed (unless there's
77  * a post_handler or break_handler).
78  */
79  int boostable;
80 };
81 
83  /* copy of the original instructions */
85  /* detour code buffer */
87  /* the size of instructions copied to detour code buffer */
88  size_t size;
89 };
90 
91 /* Return true (!0) if optinsn is prepared for optimization. */
92 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
93 {
94  return optinsn->size;
95 }
96 
97 struct prev_kprobe {
98  struct kprobe *kp;
99  unsigned long status;
100  unsigned long old_flags;
101  unsigned long saved_flags;
102 };
103 
104 /* per-cpu kprobe control block */
105 struct kprobe_ctlblk {
106  unsigned long kprobe_status;
107  unsigned long kprobe_old_flags;
108  unsigned long kprobe_saved_flags;
109  unsigned long *jprobe_saved_sp;
110  struct pt_regs jprobe_saved_regs;
112  struct prev_kprobe prev_kprobe;
113 };
114 
115 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
116 extern int kprobe_exceptions_notify(struct notifier_block *self,
117  unsigned long val, void *data);
118 #endif /* _ASM_X86_KPROBES_H */