marcus.brinkmann at ruhr-uni-bochum
Jan 21, 2008, 9:02 AM
Post #2 of 2
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At Mon, 21 Jan 2008 01:04:00 +0200,
Ismail Dönmez <ismail [at] pardus> wrote:
> Jakub Jelinek of gcc and glibc fame fixed inline asm in padlock support code.
> His patch and explanation is available at
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34725#c4 .
>
> I tested the patch and it works.
Yes, but it leaves a superfluous %0 which is not used. So, I put in a
slightly simpler fix:
asm volatile
("pushl %%ebx\n\t" /* Save GOT register. */
"xorl %%eax, %%eax\n\t" /* 0 -> EAX. */
"cpuid\n\t" /* Get vendor ID. */
"movl %%ebx, (%0)\n\t" /* EBX,EDX,ECX -> VENDOR_ID. */
"movl %%edx, 4(%0)\n\t"
"movl %%ecx, 8(%0)\n\t"
"popl %%ebx\n"
:
: "S" (&vendor_id[0])
: "%eax", "%ecx", "%edx", "cc"
);
Thanks,
Marcus
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