diff options
Diffstat (limited to 'include/asm-i386/unwind.h')
-rw-r--r-- | include/asm-i386/unwind.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/include/asm-i386/unwind.h b/include/asm-i386/unwind.h new file mode 100644 index 000000000000..d480f2e38215 --- /dev/null +++ b/include/asm-i386/unwind.h | |||
@@ -0,0 +1,98 @@ | |||
1 | #ifndef _ASM_I386_UNWIND_H | ||
2 | #define _ASM_I386_UNWIND_H | ||
3 | |||
4 | /* | ||
5 | * Copyright (C) 2002-2006 Novell, Inc. | ||
6 | * Jan Beulich <jbeulich@novell.com> | ||
7 | * This code is released under version 2 of the GNU GPL. | ||
8 | */ | ||
9 | |||
10 | #ifdef CONFIG_STACK_UNWIND | ||
11 | |||
12 | #include <linux/sched.h> | ||
13 | #include <asm/fixmap.h> | ||
14 | #include <asm/ptrace.h> | ||
15 | #include <asm/uaccess.h> | ||
16 | |||
17 | struct unwind_frame_info | ||
18 | { | ||
19 | struct pt_regs regs; | ||
20 | struct task_struct *task; | ||
21 | }; | ||
22 | |||
23 | #define UNW_PC(frame) (frame)->regs.eip | ||
24 | #define UNW_SP(frame) (frame)->regs.esp | ||
25 | #ifdef CONFIG_FRAME_POINTER | ||
26 | #define UNW_FP(frame) (frame)->regs.ebp | ||
27 | #define FRAME_RETADDR_OFFSET 4 | ||
28 | #define FRAME_LINK_OFFSET 0 | ||
29 | #define STACK_BOTTOM(tsk) STACK_LIMIT((tsk)->thread.esp0) | ||
30 | #define STACK_TOP(tsk) ((tsk)->thread.esp0) | ||
31 | #endif | ||
32 | #define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1)) | ||
33 | |||
34 | #define UNW_REGISTER_INFO \ | ||
35 | PTREGS_INFO(eax), \ | ||
36 | PTREGS_INFO(ecx), \ | ||
37 | PTREGS_INFO(edx), \ | ||
38 | PTREGS_INFO(ebx), \ | ||
39 | PTREGS_INFO(esp), \ | ||
40 | PTREGS_INFO(ebp), \ | ||
41 | PTREGS_INFO(esi), \ | ||
42 | PTREGS_INFO(edi), \ | ||
43 | PTREGS_INFO(eip) | ||
44 | |||
45 | static inline void arch_unw_init_frame_info(struct unwind_frame_info *info, | ||
46 | /*const*/ struct pt_regs *regs) | ||
47 | { | ||
48 | if (user_mode_vm(regs)) | ||
49 | info->regs = *regs; | ||
50 | else { | ||
51 | memcpy(&info->regs, regs, offsetof(struct pt_regs, esp)); | ||
52 | info->regs.esp = (unsigned long)®s->esp; | ||
53 | info->regs.xss = __KERNEL_DS; | ||
54 | } | ||
55 | } | ||
56 | |||
57 | static inline void arch_unw_init_blocked(struct unwind_frame_info *info) | ||
58 | { | ||
59 | memset(&info->regs, 0, sizeof(info->regs)); | ||
60 | info->regs.eip = info->task->thread.eip; | ||
61 | info->regs.xcs = __KERNEL_CS; | ||
62 | __get_user(info->regs.ebp, (long *)info->task->thread.esp); | ||
63 | info->regs.esp = info->task->thread.esp; | ||
64 | info->regs.xss = __KERNEL_DS; | ||
65 | info->regs.xds = __USER_DS; | ||
66 | info->regs.xes = __USER_DS; | ||
67 | } | ||
68 | |||
69 | extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *, | ||
70 | asmlinkage int (*callback)(struct unwind_frame_info *, | ||
71 | void *arg), | ||
72 | void *arg); | ||
73 | |||
74 | static inline int arch_unw_user_mode(const struct unwind_frame_info *info) | ||
75 | { | ||
76 | #if 0 /* This can only work when selector register and EFLAGS saves/restores | ||
77 | are properly annotated (and tracked in UNW_REGISTER_INFO). */ | ||
78 | return user_mode_vm(&info->regs); | ||
79 | #else | ||
80 | return info->regs.eip < PAGE_OFFSET | ||
81 | || (info->regs.eip >= __fix_to_virt(FIX_VSYSCALL) | ||
82 | && info->regs.eip < __fix_to_virt(FIX_VSYSCALL) + PAGE_SIZE) | ||
83 | || info->regs.esp < PAGE_OFFSET; | ||
84 | #endif | ||
85 | } | ||
86 | |||
87 | #else | ||
88 | |||
89 | #define UNW_PC(frame) ((void)(frame), 0) | ||
90 | |||
91 | static inline int arch_unw_user_mode(const void *info) | ||
92 | { | ||
93 | return 0; | ||
94 | } | ||
95 | |||
96 | #endif | ||
97 | |||
98 | #endif /* _ASM_I386_UNWIND_H */ | ||