-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
yaml --- r: 37866 b: refs/heads/master c: 1df0f0f h: refs/heads/master v: v3
- Loading branch information
Atsushi Nemoto
authored and
Ralf Baechle
committed
Oct 1, 2006
1 parent
a32c4b8
commit 8d8b53a
Showing
7 changed files
with
169 additions
and
35 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: eae6c0da9df81300895949897c0451423340ac40 | ||
| refs/heads/master: 1df0f0ff7e56f6dcb1351b9490d55ebf91ff4bd8 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * arch/mips/kernel/stacktrace.c | ||
| * | ||
| * Stack trace management functions | ||
| * | ||
| * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp> | ||
| */ | ||
| #include <linux/sched.h> | ||
| #include <linux/stacktrace.h> | ||
| #include <asm/stacktrace.h> | ||
|
|
||
| /* | ||
| * Save stack-backtrace addresses into a stack_trace buffer: | ||
| */ | ||
| static void save_raw_context_stack(struct stack_trace *trace, | ||
| unsigned int skip, unsigned long reg29) | ||
| { | ||
| unsigned long *sp = (unsigned long *)reg29; | ||
| unsigned long addr; | ||
|
|
||
| while (!kstack_end(sp)) { | ||
| addr = *sp++; | ||
| if (__kernel_text_address(addr)) { | ||
| if (!skip) | ||
| trace->entries[trace->nr_entries++] = addr; | ||
| else | ||
| skip--; | ||
| if (trace->nr_entries >= trace->max_entries) | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| static struct pt_regs * save_context_stack(struct stack_trace *trace, | ||
| unsigned int skip, struct task_struct *task, struct pt_regs *regs) | ||
| { | ||
| unsigned long sp = regs->regs[29]; | ||
| #ifdef CONFIG_KALLSYMS | ||
| unsigned long ra = regs->regs[31]; | ||
| unsigned long pc = regs->cp0_epc; | ||
| extern void ret_from_irq(void); | ||
|
|
||
| if (raw_show_trace || !__kernel_text_address(pc)) { | ||
| save_raw_context_stack(trace, skip, sp); | ||
| return NULL; | ||
| } | ||
| do { | ||
| if (!skip) | ||
| trace->entries[trace->nr_entries++] = pc; | ||
| else | ||
| skip--; | ||
| if (trace->nr_entries >= trace->max_entries) | ||
| break; | ||
| /* | ||
| * If we reached the bottom of interrupt context, | ||
| * return saved pt_regs. | ||
| */ | ||
| if (pc == (unsigned long)ret_from_irq) { | ||
| unsigned long stack_page = | ||
| (unsigned long)task_stack_page(task); | ||
| if (!stack_page || | ||
| sp < stack_page || | ||
| sp > stack_page + THREAD_SIZE - 32) | ||
| break; | ||
| return (struct pt_regs *)sp; | ||
| } | ||
| pc = unwind_stack(task, &sp, pc, ra); | ||
| ra = 0; | ||
| } while (pc); | ||
| #else | ||
| save_raw_context_stack(sp); | ||
| #endif | ||
|
|
||
| return NULL; | ||
| } | ||
|
|
||
| /* | ||
| * Save stack-backtrace addresses into a stack_trace buffer. | ||
| * If all_contexts is set, all contexts (hardirq, softirq and process) | ||
| * are saved. If not set then only the current context is saved. | ||
| */ | ||
| void save_stack_trace(struct stack_trace *trace, | ||
| struct task_struct *task, int all_contexts, | ||
| unsigned int skip) | ||
| { | ||
| struct pt_regs dummyregs; | ||
| struct pt_regs *regs = &dummyregs; | ||
|
|
||
| WARN_ON(trace->nr_entries || !trace->max_entries); | ||
|
|
||
| if (task && task != current) { | ||
| regs->regs[29] = task->thread.reg29; | ||
| regs->regs[31] = 0; | ||
| regs->cp0_epc = task->thread.reg31; | ||
| } else { | ||
| if (!task) | ||
| task = current; | ||
| prepare_frametrace(regs); | ||
| } | ||
|
|
||
| while (1) { | ||
| regs = save_context_stack(trace, skip, task, regs); | ||
| if (!all_contexts || !regs || | ||
| trace->nr_entries >= trace->max_entries) | ||
| break; | ||
| trace->entries[trace->nr_entries++] = ULONG_MAX; | ||
| if (trace->nr_entries >= trace->max_entries) | ||
| break; | ||
| skip = 0; | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| #ifndef _ASM_STACKTRACE_H | ||
| #define _ASM_STACKTRACE_H | ||
|
|
||
| #include <asm/ptrace.h> | ||
|
|
||
| #ifdef CONFIG_KALLSYMS | ||
| extern int raw_show_trace; | ||
| extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp, | ||
| unsigned long pc, unsigned long ra); | ||
| #else | ||
| #define raw_show_trace 1 | ||
| #define unwind_stack(task, sp, pc, ra) 0 | ||
| #endif | ||
|
|
||
| static __always_inline void prepare_frametrace(struct pt_regs *regs) | ||
| { | ||
| #ifndef CONFIG_KALLSYMS | ||
| /* | ||
| * Remove any garbage that may be in regs (specially func | ||
| * addresses) to avoid show_raw_backtrace() to report them | ||
| */ | ||
| memset(regs, 0, sizeof(*regs)); | ||
| #endif | ||
| __asm__ __volatile__( | ||
| ".set push\n\t" | ||
| ".set noat\n\t" | ||
| #ifdef CONFIG_64BIT | ||
| "1: dla $1, 1b\n\t" | ||
| "sd $1, %0\n\t" | ||
| "sd $29, %1\n\t" | ||
| "sd $31, %2\n\t" | ||
| #else | ||
| "1: la $1, 1b\n\t" | ||
| "sw $1, %0\n\t" | ||
| "sw $29, %1\n\t" | ||
| "sw $31, %2\n\t" | ||
| #endif | ||
| ".set pop\n\t" | ||
| : "=m" (regs->cp0_epc), | ||
| "=m" (regs->regs[29]), "=m" (regs->regs[31]) | ||
| : : "memory"); | ||
| } | ||
|
|
||
| #endif /* _ASM_STACKTRACE_H */ |