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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2007-04-28 09:59:37 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-04-28 09:59:37 +0100 |
commit | f16fb1ecc5a1cb2f7cc595179d1fe55e711e599f (patch) | |
tree | 6fae06d1edc3cd1235149c4e68058120e00ef4a8 /arch/arm/kernel/stacktrace.c | |
parent | ed519dede3d705e1c0012acd5b8de4074aa30fa4 (diff) | |
download | kernel_samsung_smdk4412-f16fb1ecc5a1cb2f7cc595179d1fe55e711e599f.zip kernel_samsung_smdk4412-f16fb1ecc5a1cb2f7cc595179d1fe55e711e599f.tar.gz kernel_samsung_smdk4412-f16fb1ecc5a1cb2f7cc595179d1fe55e711e599f.tar.bz2 |
[ARM] Add stacktrace support and make oprofile use it
Add support for stacktrace. Use the new stacktrace code with
oprofile instead of it's version; there's no point having
multiple versions of stacktracing in the kernel.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/stacktrace.c')
-rw-r--r-- | arch/arm/kernel/stacktrace.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c new file mode 100644 index 0000000..77ef35e --- /dev/null +++ b/arch/arm/kernel/stacktrace.c @@ -0,0 +1,73 @@ +#include <linux/sched.h> +#include <linux/stacktrace.h> + +#include "stacktrace.h" + +int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high, + int (*fn)(struct stackframe *, void *), void *data) +{ + struct stackframe *frame; + + do { + /* + * Check current frame pointer is within bounds + */ + if ((fp - 12) < low || fp + 4 >= high) + break; + + frame = (struct stackframe *)(fp - 12); + + if (fn(frame, data)) + break; + + /* + * Update the low bound - the next frame must always + * be at a higher address than the current frame. + */ + low = fp + 4; + fp = frame->fp; + } while (fp); + + return 0; +} + +#ifdef CONFIG_STACKTRACE +struct stack_trace_data { + struct stack_trace *trace; + unsigned int skip; +}; + +static int save_trace(struct stackframe *frame, void *d) +{ + struct stack_trace_data *data = d; + struct stack_trace *trace = data->trace; + + if (data->skip) { + data->skip--; + return 0; + } + + trace->entries[trace->nr_entries++] = frame->lr; + + return trace->nr_entries >= trace->max_entries; +} + +void save_stack_trace(struct stack_trace *trace, struct task_struct *task) +{ + struct stack_trace_data data; + unsigned long fp, base; + + data.trace = trace; + data.skip = trace->skip; + + if (task) { + base = (unsigned long)task_stack_page(task); + fp = 0; /* FIXME */ + } else { + base = (unsigned long)task_stack_page(current); + asm("mov %0, fp" : "=r" (fp)); + } + + walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data); +} +#endif |