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/*
* Copyright (c) 1995-1996, 1998, 1999 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
/*
* This function provides a dump of the function call stack on an x86. It
* starts with its caller's frame, and goes back until either the
* maximum number of levels is exceeded, or its hits a null fp or eip.
*
* The prototype is in <oskit/debug.h>
*/
#define MAX_ST_LEVELS 16
/*
* dump current stack trace to specified printf function
*/
void dump_stack_trace_bis(int (*__printf)(const char *,...), int max_st_levels)
{
unsigned int *fp, i;
asm volatile ("movl %%ebp,%0" : "=r" (fp));
__printf("Backtrace: fp=%x", (int) fp);
for (i = 0; i < max_st_levels; i++) {
if ((i % 8) == 0)
__printf("\n");
fp = (int *)(*fp);
if (!(*(fp + 1) && *fp))
break;
__printf(" %08x", *(fp + 1));
}
__printf("\n");
}
/*
* dump current stack trace
*/
void dump_stack_trace(void)
{
dump_stack_trace_bis(printf, MAX_ST_LEVELS);
}
/*
* store a backtrace
*/
void
store_stack_trace(unsigned *backtrace, int max_len)
{
unsigned *ebp;
unsigned i;
asm volatile("movl %%ebp,%0" : "=r" (ebp));
for (i = 0; ebp && i < max_len - 1; i++)
{
backtrace[i] = ebp[1];
ebp = (unsigned*)ebp[0];
}
backtrace[i] = 0;
}
/*
* dump a stored backtrace
*/
void
dump_stored_stack_trace(int (*__printf)(const char *,...),
unsigned *backtrace,
int max_st_levels)
{
unsigned int i;
__printf("Backtrace:");
for (i = 0; backtrace[i] && i < max_st_levels; i++)
__printf(" %08x", backtrace[i]);
__printf("\n");
}
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