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1da177e4 LT |
1 | #ifndef _ASM_KPROBES_H |
2 | #define _ASM_KPROBES_H | |
3 | /* | |
4 | * Kernel Probes (KProbes) | |
5 | * include/asm-i386/kprobes.h | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | * | |
21 | * Copyright (C) IBM Corporation, 2002, 2004 | |
22 | * | |
23 | * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel | |
24 | * Probes initial implementation ( includes suggestions from | |
25 | * Rusty Russell). | |
26 | */ | |
27 | #include <linux/types.h> | |
28 | #include <linux/ptrace.h> | |
29 | ||
124d90be PP |
30 | #define __ARCH_WANT_KPROBES_INSN_SLOT |
31 | ||
32 | struct kprobe; | |
1da177e4 LT |
33 | struct pt_regs; |
34 | ||
35 | typedef u8 kprobe_opcode_t; | |
36 | #define BREAKPOINT_INSTRUCTION 0xcc | |
311ac88f | 37 | #define RELATIVEJUMP_INSTRUCTION 0xe9 |
1da177e4 LT |
38 | #define MAX_INSN_SIZE 16 |
39 | #define MAX_STACK_SIZE 64 | |
40 | #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ | |
41 | (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ | |
42 | ? (MAX_STACK_SIZE) \ | |
43 | : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) | |
44 | ||
b94cce92 | 45 | #define ARCH_SUPPORTS_KRETPROBES |
a9ad965e | 46 | #define flush_insn_slot(p) do { } while (0) |
b94cce92 | 47 | |
124d90be | 48 | void arch_remove_kprobe(struct kprobe *p); |
b94cce92 | 49 | void kretprobe_trampoline(void); |
1da177e4 LT |
50 | |
51 | /* Architecture specific copy of original instruction*/ | |
52 | struct arch_specific_insn { | |
53 | /* copy of the original instruction */ | |
124d90be | 54 | kprobe_opcode_t *insn; |
311ac88f MH |
55 | /* |
56 | * If this flag is not 0, this kprobe can be boost when its | |
57 | * post_handler and break_handler is not set. | |
58 | */ | |
59 | int boostable; | |
1da177e4 LT |
60 | }; |
61 | ||
9a0e3a86 AM |
62 | struct prev_kprobe { |
63 | struct kprobe *kp; | |
64 | unsigned long status; | |
65 | unsigned long old_eflags; | |
66 | unsigned long saved_eflags; | |
67 | }; | |
68 | ||
69 | /* per-cpu kprobe control block */ | |
70 | struct kprobe_ctlblk { | |
71 | unsigned long kprobe_status; | |
72 | unsigned long kprobe_old_eflags; | |
73 | unsigned long kprobe_saved_eflags; | |
74 | long *jprobe_saved_esp; | |
75 | struct pt_regs jprobe_saved_regs; | |
76 | kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; | |
77 | struct prev_kprobe prev_kprobe; | |
78 | }; | |
1da177e4 LT |
79 | |
80 | /* trap3/1 are intr gates for kprobes. So, restore the status of IF, | |
81 | * if necessary, before executing the original int3/1 (trap) handler. | |
82 | */ | |
83 | static inline void restore_interrupts(struct pt_regs *regs) | |
84 | { | |
85 | if (regs->eflags & IF_MASK) | |
86 | local_irq_enable(); | |
87 | } | |
88 | ||
1da177e4 LT |
89 | extern int kprobe_exceptions_notify(struct notifier_block *self, |
90 | unsigned long val, void *data); | |
74a0b576 | 91 | extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); |
1da177e4 | 92 | #endif /* _ASM_KPROBES_H */ |