On 10/16/19 3:17 PM, Josef Wolf wrote:
> Hello all,
>
> I experience target crashing when cross compiling for ARM with
> -ftree-loop-distribute-patterns, which is enabled by the -O3 flag.
>
> The crash happens in the startup code, before main() is called. This startup
> code looks like this:
>
> extern unsigned long _sidata; /* Set by the linker */
> extern unsigned long _sdata; /* Set by the linker */
> extern unsigned long _sbss; /* Set by the linker */
> extern unsigned long _ebss; /* Set by the linker */
>
> void Reet_Handler (void)
> {
> unsigned long *src = &_sidata
> unsigned long *src = &_sdata
>
> /* Copy data segment into RAM */
> if (src != dst) {
> while (dst < &_edata)
> *(dst++) = *(src++);
> }
>
> /* Zero BSS segment */
> dst = &_sbss;
> while (dst < &_ebss)
> *(dst++) = 0;
>
> main();
> }
>
>
> With -ftree-loop-distribute-patterns those two loops are replaced by calls to
> memcpy() and memset().
>
> The memcpy function finishes just fine. But the memset function doesn't seem
> to finish. It looks like this:
>
> void memset (void *s, int c, size_t n)
> {
> int i;
> for (i=0; i<n; i++)
> ((char *)s)[i] = c;
> }
>
> Any ideas why this function is crashing? I can't see anything suspicious here.
>
> Thanks
Is your stack part of the BSS? In that case the call to memset will
cause a crash.
Matthias
--
Matthias Pfaller Software Entwicklung
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