diff options
Diffstat (limited to 'arch/i386')
-rw-r--r-- | arch/i386/Kconfig | 4 | ||||
-rw-r--r-- | arch/i386/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/i386/kernel/stacktrace.c | 98 |
3 files changed, 103 insertions, 0 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig index 27d8dddbaa47..076a72c7a41f 100644 --- a/arch/i386/Kconfig +++ b/arch/i386/Kconfig | |||
@@ -18,6 +18,10 @@ config GENERIC_TIME | |||
18 | bool | 18 | bool |
19 | default y | 19 | default y |
20 | 20 | ||
21 | config STACKTRACE_SUPPORT | ||
22 | bool | ||
23 | default y | ||
24 | |||
21 | config SEMAPHORE_SLEEPERS | 25 | config SEMAPHORE_SLEEPERS |
22 | bool | 26 | bool |
23 | default y | 27 | default y |
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile index cbc1184e9473..1b452a1665c4 100644 --- a/arch/i386/kernel/Makefile +++ b/arch/i386/kernel/Makefile | |||
@@ -9,6 +9,7 @@ obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o \ | |||
9 | pci-dma.o i386_ksyms.o i387.o bootflag.o \ | 9 | pci-dma.o i386_ksyms.o i387.o bootflag.o \ |
10 | quirks.o i8237.o topology.o alternative.o i8253.o tsc.o | 10 | quirks.o i8237.o topology.o alternative.o i8253.o tsc.o |
11 | 11 | ||
12 | obj-$(CONFIG_STACKTRACE) += stacktrace.o | ||
12 | obj-y += cpu/ | 13 | obj-y += cpu/ |
13 | obj-y += acpi/ | 14 | obj-y += acpi/ |
14 | obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o | 15 | obj-$(CONFIG_X86_BIOS_REBOOT) += reboot.o |
diff --git a/arch/i386/kernel/stacktrace.c b/arch/i386/kernel/stacktrace.c new file mode 100644 index 000000000000..e62a037ab399 --- /dev/null +++ b/arch/i386/kernel/stacktrace.c | |||
@@ -0,0 +1,98 @@ | |||
1 | /* | ||
2 | * arch/i386/kernel/stacktrace.c | ||
3 | * | ||
4 | * Stack trace management functions | ||
5 | * | ||
6 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | ||
7 | */ | ||
8 | #include <linux/sched.h> | ||
9 | #include <linux/stacktrace.h> | ||
10 | |||
11 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) | ||
12 | { | ||
13 | return p > (void *)tinfo && | ||
14 | p < (void *)tinfo + THREAD_SIZE - 3; | ||
15 | } | ||
16 | |||
17 | /* | ||
18 | * Save stack-backtrace addresses into a stack_trace buffer: | ||
19 | */ | ||
20 | static inline unsigned long | ||
21 | save_context_stack(struct stack_trace *trace, unsigned int skip, | ||
22 | struct thread_info *tinfo, unsigned long *stack, | ||
23 | unsigned long ebp) | ||
24 | { | ||
25 | unsigned long addr; | ||
26 | |||
27 | #ifdef CONFIG_FRAME_POINTER | ||
28 | while (valid_stack_ptr(tinfo, (void *)ebp)) { | ||
29 | addr = *(unsigned long *)(ebp + 4); | ||
30 | if (!skip) | ||
31 | trace->entries[trace->nr_entries++] = addr; | ||
32 | else | ||
33 | skip--; | ||
34 | if (trace->nr_entries >= trace->max_entries) | ||
35 | break; | ||
36 | /* | ||
37 | * break out of recursive entries (such as | ||
38 | * end_of_stack_stop_unwind_function): | ||
39 | */ | ||
40 | if (ebp == *(unsigned long *)ebp) | ||
41 | break; | ||
42 | |||
43 | ebp = *(unsigned long *)ebp; | ||
44 | } | ||
45 | #else | ||
46 | while (valid_stack_ptr(tinfo, stack)) { | ||
47 | addr = *stack++; | ||
48 | if (__kernel_text_address(addr)) { | ||
49 | if (!skip) | ||
50 | trace->entries[trace->nr_entries++] = addr; | ||
51 | else | ||
52 | skip--; | ||
53 | if (trace->nr_entries >= trace->max_entries) | ||
54 | break; | ||
55 | } | ||
56 | } | ||
57 | #endif | ||
58 | |||
59 | return ebp; | ||
60 | } | ||
61 | |||
62 | /* | ||
63 | * Save stack-backtrace addresses into a stack_trace buffer. | ||
64 | * If all_contexts is set, all contexts (hardirq, softirq and process) | ||
65 | * are saved. If not set then only the current context is saved. | ||
66 | */ | ||
67 | void save_stack_trace(struct stack_trace *trace, | ||
68 | struct task_struct *task, int all_contexts, | ||
69 | unsigned int skip) | ||
70 | { | ||
71 | unsigned long ebp; | ||
72 | unsigned long *stack = &ebp; | ||
73 | |||
74 | WARN_ON(trace->nr_entries || !trace->max_entries); | ||
75 | |||
76 | if (!task || task == current) { | ||
77 | /* Grab ebp right from our regs: */ | ||
78 | asm ("movl %%ebp, %0" : "=r" (ebp)); | ||
79 | } else { | ||
80 | /* ebp is the last reg pushed by switch_to(): */ | ||
81 | ebp = *(unsigned long *) task->thread.esp; | ||
82 | } | ||
83 | |||
84 | while (1) { | ||
85 | struct thread_info *context = (struct thread_info *) | ||
86 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | ||
87 | |||
88 | ebp = save_context_stack(trace, skip, context, stack, ebp); | ||
89 | stack = (unsigned long *)context->previous_esp; | ||
90 | if (!all_contexts || !stack || | ||
91 | trace->nr_entries >= trace->max_entries) | ||
92 | break; | ||
93 | trace->entries[trace->nr_entries++] = ULONG_MAX; | ||
94 | if (trace->nr_entries >= trace->max_entries) | ||
95 | break; | ||
96 | } | ||
97 | } | ||
98 | |||