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[MIPS] lockdep: Add STACKTRACE_SUPPORT and enable LOCKDEP_SUPPORT
Implement stacktrace interface by using unwind_stack() and enable lockdep support in Kconfig. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Atsushi Nemoto
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Ralf Baechle
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Oct 1, 2006
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| 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> | ||
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|
||
| /* | ||
| * 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; | ||
| } | ||
| } | ||
| } | ||
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| 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); | ||
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| 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; | ||
| } | ||
|
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||
| /* | ||
| * 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; | ||
|
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| WARN_ON(trace->nr_entries || !trace->max_entries); | ||
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| 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; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| #ifndef _ASM_STACKTRACE_H | ||
| #define _ASM_STACKTRACE_H | ||
|
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| #include <asm/ptrace.h> | ||
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| #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 | ||
|
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| 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"); | ||
| } | ||
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| #endif /* _ASM_STACKTRACE_H */ |