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Workaround PIC limitations in cpuid. 

cpuid uses register ebx, but ebx is reserved in PIC.
So save ebx, swap ebx & edi, and return edi.

Copied from Igor Pavlov's equivalent fix for 7zip (in CpuArch.c),
which is public domain and thus OK license-wise.
This commit is contained in:
Isaac Dunham 2014-08-28 13:05:07 -07:00
parent 2702323f7d
commit db7e6366cd
1 changed files with 8 additions and 1 deletions
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9
cpuid_x86.c
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@ -59,9 +59,16 @@
void cpuid(int op, int *eax, int *ebx, int *ecx, int *edx);
#else
static inline void cpuid(int op, int *eax, int *ebx, int *ecx, int *edx){
#if defined(__i386__) && defined(__PIC__)
__asm__ __volatile__
("mov %%ebx, %%edi;"
"cpuid;"
"xchgl %%ebx, %%edi;"
: "=a" (*eax), "=D" (*ebx), "=c" (*ecx), "=d" (*edx) : "a" (op) : "cc");
#else
__asm__ __volatile__
("cpuid": "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) : "a" (op) : "cc");
#endif
}
#endif