Antti P Miettinen <[EMAIL PROTECTED]> writes:
> Looks like the kernel somehow ends up thinking that we are loading
> something from zero. Hmm.. the value being loaded to r1 is zero. So
> could this be related to crossing a page boundary in the middle of an
> instruction? But anyway - I'll try to debug this further..
Looks like it might be the page crossing. The below little program is
a bit smaller test case. Without args, no segfault, with arg it
segfaults (inside ARM sysemu - at least for me):
#include <stdio.h>
#include <string.h>
long buf[8192/4];
int
main(int ac, char **av)
{
unsigned long base = (unsigned long)(void *)(buf + 4096/4);
unsigned long dummy;
if (ac > 1)
{
base &= ~0xfff;
base -= 4;
}
printf("buf: %p, base: 0x%08lx, dummy: 0x%08lx\n", buf, base, dummy);
__asm__ __volatile__ ("ldmia %0,{%1,%2}"
: "=r" (base) : "0" (base), "r" (dummy));
printf("base: 0x%08lx, dummy: 0x%08lx\n", base, dummy);
return 0;
}
--
http://www.iki.fi/~ananaza/
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