Marlin 2.0 for Flying Bear 4S/5
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

62 lines
1.9 KiB

/***************************************************************************
* ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
* Updated, adapted and several bug fixes on 2018 by Eduardo José Tagle
*
* This program is PUBLIC DOMAIN.
* This means that there is no copyright and anyone is able to take a copy
* for free and use it as they wish, with or without modifications, and in
* any context, commercially or otherwise. The only limitation is that I
* don't guarantee that the software is fit for any purpose or accept any
* liability for it's use or misuse - this software is without warranty.
***************************************************************************
* File Description: Implementation of the interface into the ARM unwinder.
**************************************************************************/
#if defined(__arm__) || defined(__thumb__)
#define MODULE_NAME "UNWINDER"
#include <stdio.h>
#include <string.h>
#include "unwinder.h"
#include "unwarm.h"
#include "unwarmbytab.h"
/* These symbols point to the unwind index and should be provide by the linker script */
extern "C" const UnwTabEntry __exidx_start[];
extern "C" const UnwTabEntry __exidx_end[];
// Detect if unwind information is present or not
static int HasUnwindTableInfo(void) {
// > 16 because there are default entries we can't supress
return ((char*)(&__exidx_end) - (char*)(&__exidx_start)) > 16 ? 1 : 0;
}
UnwResult UnwindStart(UnwindFrame* frame, const UnwindCallbacks *cb, void *data) {
if (HasUnwindTableInfo()) {
/* We have unwind information tables */
return UnwindByTableStart(frame, cb, data);
} else {
/* We don't have unwind information tables */
UnwState state;
/* Initialise the unwinding state */
UnwInitState(&state, cb, data, frame->pc, frame->sp);
/* Check the Thumb bit */
if(frame->pc & 0x1) {
return UnwStartThumb(&state);
}
else {
return UnwStartArm(&state);
}
}
}
#endif