diff options
| -rw-r--r-- | arch/cris/Kconfig | 3 | ||||
| -rw-r--r-- | arch/cris/include/asm/stacktrace.h | 8 | ||||
| -rw-r--r-- | arch/cris/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/cris/kernel/stacktrace.c | 76 |
4 files changed, 88 insertions, 0 deletions
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig index e7ba2d4bdd4f..61f4acceb9d4 100644 --- a/arch/cris/Kconfig +++ b/arch/cris/Kconfig @@ -40,6 +40,9 @@ config TRACE_IRQFLAGS_SUPPORT depends on ETRAX_ARCH_V32 def_bool y +config STACKTRACE_SUPPORT + def_bool y + config CRIS bool default y diff --git a/arch/cris/include/asm/stacktrace.h b/arch/cris/include/asm/stacktrace.h new file mode 100644 index 000000000000..2d90856943ad --- /dev/null +++ b/arch/cris/include/asm/stacktrace.h @@ -0,0 +1,8 @@ +#ifndef __CRIS_STACKTRACE_H +#define __CRIS_STACKTRACE_H + +void walk_stackframe(unsigned long sp, + int (*fn)(unsigned long addr, void *data), + void *data); + +#endif diff --git a/arch/cris/kernel/Makefile b/arch/cris/kernel/Makefile index edef71f12bb8..5fae398ca915 100644 --- a/arch/cris/kernel/Makefile +++ b/arch/cris/kernel/Makefile @@ -8,6 +8,7 @@ extra-y := vmlinux.lds obj-y := process.o traps.o irq.o ptrace.o setup.o time.o sys_cris.o obj-y += devicetree.o +obj-y += stacktrace.o obj-$(CONFIG_MODULES) += crisksyms.o obj-$(CONFIG_MODULES) += module.o diff --git a/arch/cris/kernel/stacktrace.c b/arch/cris/kernel/stacktrace.c new file mode 100644 index 000000000000..99838c74456d --- /dev/null +++ b/arch/cris/kernel/stacktrace.c @@ -0,0 +1,76 @@ +#include <linux/sched.h> +#include <linux/stacktrace.h> +#include <linux/stacktrace.h> +#include <asm/stacktrace.h> + +void walk_stackframe(unsigned long sp, + int (*fn)(unsigned long addr, void *data), + void *data) +{ + unsigned long high = ALIGN(sp, THREAD_SIZE); + + for (; sp <= high - 4; sp += 4) { + unsigned long addr = *(unsigned long *) sp; + + if (!kernel_text_address(addr)) + continue; + + if (fn(addr, data)) + break; + } +} + +struct stack_trace_data { + struct stack_trace *trace; + unsigned int no_sched_functions; + unsigned int skip; +}; + +#ifdef CONFIG_STACKTRACE + +static int save_trace(unsigned long addr, void *d) +{ + struct stack_trace_data *data = d; + struct stack_trace *trace = data->trace; + + if (data->no_sched_functions && in_sched_functions(addr)) + return 0; + + if (data->skip) { + data->skip--; + return 0; + } + + trace->entries[trace->nr_entries++] = addr; + + return trace->nr_entries >= trace->max_entries; +} + +void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) +{ + struct stack_trace_data data; + unsigned long sp; + + data.trace = trace; + data.skip = trace->skip; + + if (tsk != current) { + data.no_sched_functions = 1; + sp = tsk->thread.ksp; + } else { + data.no_sched_functions = 0; + sp = rdsp(); + } + + walk_stackframe(sp, save_trace, &data); + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} + +void save_stack_trace(struct stack_trace *trace) +{ + save_stack_trace_tsk(current, trace); +} +EXPORT_SYMBOL_GPL(save_stack_trace); + +#endif /* CONFIG_STACKTRACE */ |