http://bugs.gentoo.org/270388 --- a/cpuid.c +++ b/cpuid.c @@ -62,12 +62,28 @@ sched_setaffinity(getpid(), sizeof(set), &set); } +#ifdef __PIC__ + /* GCC on i386 bitches if you clobber ebx. So hide it behind + * gcc's back. */ + asm( + "movl %%ebx,%%edi\n" + "cpuid\n" + "movl %%ebx,%1\n" + "movl %%edi,%%ebx\n" + : "=a" (a), + "=m" (b), + "+c" (c), + "=d" (d) + : "0" ((unsigned int)idx) + : "edi"); +#else asm("cpuid" : "=a" (a), "=b" (b), "+c" (c), "=d" (d) : "0" ((unsigned int)idx)); +#endif if (eax!=NULL) *eax = a;