Hi Dave,
Thanks for the missing .h file for the mips. With that file, I was able to
successfully build the libunwind library files for mips. I have verified that
the libraries built are all MIPS. However, when I go to test the backtrace with
the same application as I had tested successfully with arm, it causes the app
to SEGV fault (signal 11). Was the mips implementation validated with the 1.2
release? I am running GNU/linux 2.6.36. I used -g -O0 options when compiling
libraries and the app, which should turn off all optimization.
I have attached a copy of the app's backtrace.c which I am using to do the
backtrace using libunwind.
I am interested in knowing what you think? I would like to hear if anyone else
is seeing issue with the Mips implementation?
Thanks,
John Knight
[email protected]
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/*******************************************************************
Print a backtrace of the stack to the debug log.
********************************************************************/
#include "debug.h"
#include "config.h"
#include "util.h"
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
// HAVE_LIBUNWIND passed in from Makefile
#ifdef HAVE_LIBUNWIND
#define UNW_LOCAL_ONLY
#include <libunwind.h>
#endif
#ifdef HAVE_LIBUNWIND
void log_stack_trace(char * program_name)
{
unw_cursor_t cursor; unw_context_t uc;
unw_word_t ip, sp, off;
int status;
unsigned i = 0;
char procname[256];
procname[sizeof(procname) - 1] = '\0';
if (unw_getcontext(&uc) != 0) {
INFO("unable to produce a stack trace with libunwind;
unw_getcontext failure\n");
return;
}
if (unw_init_local(&cursor, &uc) != 0) {
INFO("unable to produce a stack trace with libunwind;
unw_init_local failure\n");
return;
}
INFO("%s: BACKTRACE:\n", program_name);
while(1) {
status = unw_step(&cursor);
if(status == 0) {
// INFO("unw_step: returned %d\n", status);
break;
}
if(status < 0) {
INFO("unw_step error: %d\n", status);
break;
}
// we got a valid stack frame to display
ip = sp = 0;
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_get_reg(&cursor, UNW_REG_SP, &sp);
switch (unw_get_proc_name(&cursor, procname, sizeof(procname) - 1,
&off))
{
case 0:
/* Name found. */
case -UNW_ENOMEM:
/* Name truncated. */
INFO(" #%u %s + %#lx [ip=%#lx] [sp=%#lx]\n",
i, procname, (unsigned long)off,
(unsigned long)ip, (unsigned long) sp);
break;
default:
/* case -UNW_ENOINFO: */
/* case -UNW_EUNSPEC: */
/* No symbol name found. */
INFO(" #%u %s [ip=%#lx] [sp=%#lx]\n",
i, "<unknown symbol>",
(unsigned long)ip, (unsigned long) sp);
}
i++;
}
return;
}
#else
// If we don't have libunwind, then we can't do a stack backtrace
void log_stack_trace(char * program_name)
{
INFO("%s: unable to produce a stack trace on this platform; Need
libunwind\n", program_name);
}
#endif
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