diff options
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/mips/kernel/process.c | 1 | ||||
| -rw-r--r-- | arch/mips/kernel/stacktrace.c | 111 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 37 |
4 files changed, 116 insertions, 34 deletions
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 881c467c698..cd9cec9e39e 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -11,6 +11,7 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \ binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \ irix5sys.o sysirix.o +obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-$(CONFIG_MODULES) += mips_ksyms.o module.o obj-$(CONFIG_APM) += apm.o diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 2613a0dd4b8..695538031c6 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -40,6 +40,7 @@ #include <asm/elf.h> #include <asm/isadep.h> #include <asm/inst.h> +#include <asm/stacktrace.h> #ifdef CONFIG_MIPS_MT_SMTC #include <asm/mipsmtregs.h> extern void smtc_idle_loop_hook(void); diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c new file mode 100644 index 00000000000..f851d0cc245 --- /dev/null +++ b/arch/mips/kernel/stacktrace.c @@ -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; + } +} diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index e51d8fd9a15..440b8651fd8 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -41,6 +41,7 @@ #include <asm/mmu_context.h> #include <asm/watch.h> #include <asm/types.h> +#include <asm/stacktrace.h> extern asmlinkage void handle_int(void); extern asmlinkage void handle_tlbm(void); @@ -92,16 +93,14 @@ static void show_raw_backtrace(unsigned long reg29) } #ifdef CONFIG_KALLSYMS -static int raw_show_trace; +int raw_show_trace; static int __init set_raw_show_trace(char *str) { raw_show_trace = 1; return 1; } __setup("raw_show_trace", set_raw_show_trace); - -extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp, - unsigned long pc, unsigned long ra); +#endif static void show_backtrace(struct task_struct *task, struct pt_regs *regs) { @@ -121,9 +120,6 @@ static void show_backtrace(struct task_struct *task, struct pt_regs *regs) } while (pc); printk("\n"); } -#else -#define show_backtrace(task, r) show_raw_backtrace((r)->regs[29]); -#endif /* * This routine abuses get_user()/put_user() to reference pointers @@ -158,28 +154,6 @@ static void show_stacktrace(struct task_struct *task, struct pt_regs *regs) show_backtrace(task, regs); } -static __always_inline void prepare_frametrace(struct pt_regs *regs) -{ - __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"); -} - void show_stack(struct task_struct *task, unsigned long *sp) { struct pt_regs regs; @@ -206,11 +180,6 @@ void dump_stack(void) { struct pt_regs regs; - /* - * Remove any garbage that may be in regs (specially func - * addresses) to avoid show_raw_backtrace() to report them - */ - memset(®s, 0, sizeof(regs)); prepare_frametrace(®s); show_backtrace(current, ®s); } |