问题
We are running the uclibc linux on ARM 9. The problem is uclibc doesn't support backtrace. When a core dump happens, I cannot grab the call stack.
Does anyone have a good solution for that?
For example, an existing porting of backtrace for uclibc, or any good method to grab the call stack when a core dump happens (uclibc+ARM+Linux)?
回答1:
Update:
It seems that a patch was created to support backtrace()
on uclibc for x86 and ARM (XScale) and it makes use of the __libc_stack_end
symbol.
Original Answer:
I worked on a project where the version of glibc we were using did not provide a functional backtrace()
for our ARM processor, so we developed our own outside of glibc using the __libc_stack_end
symbol. Below is the resulting code. Perhaps you can use it to write a uclibc backtrace()
function.
extern void * __libc_stack_end;
struct backtrace_frame_t
{
void * fp;
void * sp;
void * lr;
void * pc;
};
int backtrace(void ** array, int size)
{
void * top_frame_p;
void * current_frame_p;
struct backtrace_frame_t * frame_p;
int frame_count;
top_frame_p = __builtin_frame_address(0);
current_frame_p = top_frame_p;
frame_p = (struct backtrace_frame_t*)((void**)(current_frame_p)-3);
frame_count = 0;
if (__builtin_return_address(0) != frame_p->lr)
{
fprintf(stderr, "backtrace error: __builtin_return_address(0) != frame_p->lr\n");
return frame_count;
}
if (current_frame_p != NULL
&& current_frame_p > (void*)&frame_count
&& current_frame_p < __libc_stack_end)
{
while (frame_count < size
&& current_frame_p != NULL
&& current_frame_p > (void*)&frame_count
&& current_frame_p < __libc_stack_end)
{
frame_p = (struct backtrace_frame_t*)((void**)(current_frame_p)-3);
array[frame_count] = frame_p->lr;
frame_count++;
current_frame_p = frame_p->fp;
}
}
return frame_count;
}
Note: The __libc_stack_end
symbol is no longer exported in more recent versions of glibc and I'm not sure of the existence of it or a similar symbol in uclibc.
回答2:
Have a look at the same question asked here:
http://lists.uclibc.org/pipermail/uclibc/2010-June/044115.html
which mentions a patch from here:
http://git.stlinux.com/?p=stm/uclibc.git;a=commit;h=d6a3d9ece5922a337800a8e2ed4db7e226f9ccb3
来源:https://stackoverflow.com/questions/2536021/any-porting-available-of-backtrace-for-uclibc