On Thu, 12 Mar 2009 09:32, dex...@debian.org said:
> Program received signal SIGILL, Illegal instruction.
> [Switching to Thread 0xb7b9c6e0 (LWP 2196)]
> 0xb7bae10e in _gcry_detect_hw_features () at hwfeatures.c:78
That seems to be the cpuid opcode which is not available, Linux knows
about it:
> cpuid level : -1
but my code gets the detection wrong:
/* Detect the CPUID feature by testing some undefined behaviour (16
vs 32 bit pushf/popf). */
asm volatile
("pushf\n\t" /* Copy flags to EAX. */
"popl %%eax\n\t"
"movl %%eax, %%ecx\n\t" /* Save flags into ECX. */
"xorl $0x200000, %%eax\n\t" /* Toggle ID bit and copy it to the flags. */
"pushl %%eax\n\t"
"popf\n\t"
"pushf\n\t" /* Copy changed flags again to EAX. */
"popl %%eax\n\t"
"pushl %%ecx\n\t" /* Restore flags from ECX. */
"popf\n\t"
"xorl %%eax, %%ecx\n\t" /* Compare flags against saved flags. */
"jz .Lno_cpuid%=\n\t" /* Toggling did not work, thus no CPUID. */
"movl $1, %0\n" /* Worked. true -> HAS_CPUID. */
".Lno_cpuid%=:\n\t"
: "=r" (has_cpuid)
:
: "%eax", "%ecx", "cc"
);
if (!has_cpuid)
return; /* No way. */
Any ideas? Would anyone be so kind and compare it to the Linux code?
A workaround is to use
./configure --disable-padlock-support
However, that makes it slow on VIA CPUs.
Shalom-Salam,
Werner
--
Die Gedanken sind frei. Auschnahme regelt ein Bundeschgesetz.
--
To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org
with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
