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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 | * | |
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 | ||
28 | #define __ARCH_WANT_KPROBES_INSN_SLOT | |
29 | ||
30 | struct pt_regs; | |
31 | struct kprobe; | |
32 | ||
33 | typedef u8 kprobe_opcode_t; | |
34 | #define BREAKPOINT_INSTRUCTION 0xcc | |
35 | #define RELATIVEJUMP_INSTRUCTION 0xe9 | |
36 | #define MAX_INSN_SIZE 16 | |
37 | #define MAX_STACK_SIZE 64 | |
864dfa13 JP |
38 | #define MIN_STACK_SIZE(ADDR) \ |
39 | (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ | |
40 | THREAD_SIZE - (unsigned long)(ADDR))) \ | |
41 | ? (MAX_STACK_SIZE) \ | |
42 | : (((unsigned long)current_thread_info()) + \ | |
43 | THREAD_SIZE - (unsigned long)(ADDR))) | |
d6be29b8 | 44 | |
d6be29b8 MH |
45 | #define flush_insn_slot(p) do { } while (0) |
46 | ||
47 | extern const int kretprobe_blacklist_size; | |
48 | ||
49 | void arch_remove_kprobe(struct kprobe *p); | |
50 | void kretprobe_trampoline(void); | |
51 | ||
52 | /* Architecture specific copy of original instruction*/ | |
53 | struct arch_specific_insn { | |
54 | /* copy of the original instruction */ | |
55 | kprobe_opcode_t *insn; | |
56 | /* | |
57 | * boostable = -1: This instruction type is not boostable. | |
58 | * boostable = 0: This instruction type is boostable. | |
59 | * boostable = 1: This instruction has been boosted: we have | |
60 | * added a relative jump after the instruction copy in insn, | |
61 | * so no single-step and fixup are needed (unless there's | |
62 | * a post_handler or break_handler). | |
63 | */ | |
64 | int boostable; | |
65 | }; | |
66 | ||
67 | struct prev_kprobe { | |
68 | struct kprobe *kp; | |
69 | unsigned long status; | |
70 | unsigned long old_flags; | |
71 | unsigned long saved_flags; | |
72 | }; | |
73 | ||
74 | /* per-cpu kprobe control block */ | |
75 | struct kprobe_ctlblk { | |
76 | unsigned long kprobe_status; | |
77 | unsigned long kprobe_old_flags; | |
78 | unsigned long kprobe_saved_flags; | |
79 | unsigned long *jprobe_saved_sp; | |
80 | struct pt_regs jprobe_saved_regs; | |
81 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; | |
82 | struct prev_kprobe prev_kprobe; | |
83 | }; | |
84 | ||
85 | /* trap3/1 are intr gates for kprobes. So, restore the status of IF, | |
86 | * if necessary, before executing the original int3/1 (trap) handler. | |
87 | */ | |
88 | static inline void restore_interrupts(struct pt_regs *regs) | |
89 | { | |
053de044 | 90 | if (regs->flags & X86_EFLAGS_IF) |
d6be29b8 MH |
91 | local_irq_enable(); |
92 | } | |
93 | ||
94 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); | |
95 | extern int kprobe_exceptions_notify(struct notifier_block *self, | |
96 | unsigned long val, void *data); | |
97 | #endif /* _ASM_KPROBES_H */ |