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authorJan Beulich <jbeulich@novell.com>2006-06-26 07:57:32 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 13:48:17 -0400
commitb538ed278b80641ee6d7b75497d5e14de1bb1137 (patch)
treefe508a2f950ec08c832474a253f41b188ceece75 /include
parent4552d5dc08b79868829b4be8951b29b07284753f (diff)
[PATCH] x86_64: reliable stack trace support (x86-64)
These are the x86_64-specific pieces to enable reliable stack traces. The only restriction with this is that it currently cannot unwind across the interrupt->normal stack boundary, as that transition is lacking proper annotation. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86_64/proto.h2
-rw-r--r--include/asm-x86_64/unwind.h106
2 files changed, 107 insertions, 1 deletions
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h
index 1064533e0959..105476ff8039 100644
--- a/include/asm-x86_64/proto.h
+++ b/include/asm-x86_64/proto.h
@@ -75,7 +75,7 @@ extern void main_timer_handler(struct pt_regs *regs);
75 75
76extern unsigned long end_pfn_map; 76extern unsigned long end_pfn_map;
77 77
78extern void show_trace(unsigned long * rsp); 78extern void show_trace(struct task_struct *, struct pt_regs *, unsigned long * rsp);
79extern void show_registers(struct pt_regs *regs); 79extern void show_registers(struct pt_regs *regs);
80 80
81extern void exception_table_check(void); 81extern void exception_table_check(void);
diff --git a/include/asm-x86_64/unwind.h b/include/asm-x86_64/unwind.h
new file mode 100644
index 000000000000..4f61de246179
--- /dev/null
+++ b/include/asm-x86_64/unwind.h
@@ -0,0 +1,106 @@
1#ifndef _ASM_X86_64_UNWIND_H
2#define _ASM_X86_64_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/ptrace.h>
14#include <asm/uaccess.h>
15#include <asm/vsyscall.h>
16
17struct unwind_frame_info
18{
19 struct pt_regs regs;
20 struct task_struct *task;
21};
22
23#define UNW_PC(frame) (frame)->regs.rip
24#define UNW_SP(frame) (frame)->regs.rsp
25#ifdef CONFIG_FRAME_POINTER
26#define UNW_FP(frame) (frame)->regs.rbp
27#define FRAME_RETADDR_OFFSET 8
28#define FRAME_LINK_OFFSET 0
29#define STACK_BOTTOM(tsk) (((tsk)->thread.rsp0 - 1) & ~(THREAD_SIZE - 1))
30#define STACK_TOP(tsk) ((tsk)->thread.rsp0)
31#endif
32/* Might need to account for the special exception and interrupt handling
33 stacks here, since normally
34 EXCEPTION_STACK_ORDER < THREAD_ORDER < IRQSTACK_ORDER,
35 but the construct is needed only for getting across the stack switch to
36 the interrupt stack - thus considering the IRQ stack itself is unnecessary,
37 and the overhead of comparing against all exception handling stacks seems
38 not desirable. */
39#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
40
41#define UNW_REGISTER_INFO \
42 PTREGS_INFO(rax), \
43 PTREGS_INFO(rdx), \
44 PTREGS_INFO(rcx), \
45 PTREGS_INFO(rbx), \
46 PTREGS_INFO(rsi), \
47 PTREGS_INFO(rdi), \
48 PTREGS_INFO(rbp), \
49 PTREGS_INFO(rsp), \
50 PTREGS_INFO(r8), \
51 PTREGS_INFO(r9), \
52 PTREGS_INFO(r10), \
53 PTREGS_INFO(r11), \
54 PTREGS_INFO(r12), \
55 PTREGS_INFO(r13), \
56 PTREGS_INFO(r14), \
57 PTREGS_INFO(r15), \
58 PTREGS_INFO(rip)
59
60static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
61 /*const*/ struct pt_regs *regs)
62{
63 info->regs = *regs;
64}
65
66static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
67{
68 extern const char thread_return[];
69
70 memset(&info->regs, 0, sizeof(info->regs));
71 info->regs.rip = (unsigned long)thread_return;
72 info->regs.cs = __KERNEL_CS;
73 __get_user(info->regs.rbp, (unsigned long *)info->task->thread.rsp);
74 info->regs.rsp = info->task->thread.rsp;
75 info->regs.ss = __KERNEL_DS;
76}
77
78extern void arch_unwind_init_running(struct unwind_frame_info *,
79 void (*callback)(struct unwind_frame_info *,
80 void *arg),
81 void *arg);
82
83static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
84{
85#if 0 /* This can only work when selector register saves/restores
86 are properly annotated (and tracked in UNW_REGISTER_INFO). */
87 return user_mode(&info->regs);
88#else
89 return (long)info->regs.rip >= 0
90 || (info->regs.rip >= VSYSCALL_START && info->regs.rip < VSYSCALL_END)
91 || (long)info->regs.rsp >= 0;
92#endif
93}
94
95#else
96
97#define UNW_PC(frame) ((void)(frame), 0)
98
99static inline int arch_unw_user_mode(const void *info)
100{
101 return 0;
102}
103
104#endif
105
106#endif /* _ASM_X86_64_UNWIND_H */