fac0779029
ab1b6f03a1 said
- remove the unused task argument to save_stack_trace, it's always current
then broke arm:
arch/arm/kernel/stacktrace.c:56: error: conflicting types for 'save_stack_trace'
include/linux/stacktrace.h:11: error: previous declaration of 'save_stack_trace' was here
arch/arm/kernel/stacktrace.c:56: error: conflicting types for 'save_stack_trace'
include/linux/stacktrace.h:11: error: previous declaration of 'save_stack_trace' was here
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
#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 stack_trace_data data;
|
|
unsigned long fp, base;
|
|
|
|
data.trace = trace;
|
|
data.skip = trace->skip;
|
|
base = (unsigned long)task_stack_page(current);
|
|
asm("mov %0, fp" : "=r" (fp));
|
|
|
|
walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
|
|
}
|
|
#endif
|