| Author: Andreas Beckmann <anbe@debian.org> |
| Description: fix cpuid inline assembly |
| the old code zeroed the upper half of %rbx |
| |
| --- a/helper_functions.c |
| +++ b/helper_functions.c |
| @@ -101,13 +101,7 @@ static inline void cpuid (unsigned int i |
| unsigned int *ecx, unsigned int *edx) |
| { |
| unsigned int _eax = info, _ebx, _ecx, _edx; |
| - asm volatile ("mov %%ebx, %%edi;" // save ebx (for PIC) |
| - "cpuid;" |
| - "mov %%ebx, %%esi;" // pass to caller |
| - "mov %%edi, %%ebx;" // restore ebx |
| - :"+a" (_eax), "=S" (_ebx), "=c" (_ecx), "=d" (_edx) |
| - : /* inputs: eax is handled above */ |
| - :"edi" /* clobbers: we hit edi directly */); |
| + asm volatile ("cpuid\n\t" : "+a" (_eax), "=b" (_ebx), "=c" (_ecx), "=d" (_edx) : : ); |
| if (eax) *eax = _eax; |
| if (ebx) *ebx = _ebx; |
| if (ecx) *ecx = _ecx; |
