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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <processor.h>
#include <cpu.h>
/* Upto 10 frames each of length 40 bytes + header = 440 bytes */
#define STACK_BUF_SZ 440
static char backtrace_buffer[STACK_BUF_SZ];
/* Dumps backtrace to buffer */
void __nomcount __backtrace(char *bt_buf, int bt_buf_len)
{
unsigned int pir = mfspr(SPR_PIR);
unsigned long *sp;
unsigned long *bottom, *top;
char *buf;
int len = 0;
/* Check if there's a __builtin_something instead */
asm("mr %0,1" : "=r" (sp));
bottom = cpu_stack_bottom(pir);
top = cpu_stack_top(pir);
if (!bt_buf || !bt_buf_len)
return;
buf = bt_buf;
len += snprintf(buf, bt_buf_len, "CPU %08x Backtrace:\n", pir);
/* XXX Handle SMP */
while (sp > bottom && sp < top) {
len += snprintf(buf + len, bt_buf_len - len, " S: %016lx "
"R: %016lx\n", (unsigned long)sp, sp[2]);
sp = (unsigned long *)sp[0];
}
}
void backtrace(void)
{
memset(backtrace_buffer, 0, STACK_BUF_SZ);
__backtrace(backtrace_buffer, STACK_BUF_SZ);
fputs(backtrace_buffer, stderr);
}
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