f16fb1ecc5
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>
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include "stacktrace.h"
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int walk_stackframe(unsigned long fp, unsigned long low, unsigned long high,
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int (*fn)(struct stackframe *, void *), void *data)
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{
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struct stackframe *frame;
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do {
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/*
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* Check current frame pointer is within bounds
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*/
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if ((fp - 12) < low || fp + 4 >= high)
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break;
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frame = (struct stackframe *)(fp - 12);
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if (fn(frame, data))
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break;
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/*
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* Update the low bound - the next frame must always
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* be at a higher address than the current frame.
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*/
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low = fp + 4;
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fp = frame->fp;
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} while (fp);
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return 0;
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}
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#ifdef CONFIG_STACKTRACE
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struct stack_trace_data {
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struct stack_trace *trace;
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unsigned int skip;
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};
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static int save_trace(struct stackframe *frame, void *d)
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{
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struct stack_trace_data *data = d;
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struct stack_trace *trace = data->trace;
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if (data->skip) {
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data->skip--;
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return 0;
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}
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trace->entries[trace->nr_entries++] = frame->lr;
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return trace->nr_entries >= trace->max_entries;
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}
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void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
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{
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struct stack_trace_data data;
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unsigned long fp, base;
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data.trace = trace;
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data.skip = trace->skip;
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if (task) {
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base = (unsigned long)task_stack_page(task);
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fp = 0; /* FIXME */
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} else {
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base = (unsigned long)task_stack_page(current);
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asm("mov %0, fp" : "=r" (fp));
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}
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walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
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}
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#endif
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