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(svn r26208) -Fix (r26197): the cpuid assembly didn't work when PIC was enabled

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rubidium 2014-01-02 21:28:40 +00:00
parent b100125866
commit 456dba4889
1 changed files with 14 additions and 2 deletions
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16
src/cpu.cpp
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@ -96,9 +96,21 @@ void ottd_cpuid(int info[4], int type)
#elif defined(__x86_64__) || defined(__i386)
void ottd_cpuid(int info[4], int type)
{
/* The easy variant would be just cpuid, however... ebx gets clobbered by PIC. */
__asm__ __volatile__ (
"cpuid"
: "=a" (info[0]), "=b" (info[1]), "=c" (info[2]), "=d" (info[3])
#if defined(__x86_64__)
"pushq %%rbx \n\t" // save %rbx
#else
"pushl %%ebx \n\t" // save %ebx
#endif
"cpuid \n\t"
"movl %%ebx, %1 \n\t" // write the result into output var
#if defined(__x86_64__)
"popq %%rbx \n\t" // restore %rbx
#else
"popl %%ebx \n\t" // restore %ebc
#endif
: "=a" (info[0]), "=r" (info[1]), "=c" (info[2]), "=d" (info[3])
: "a" (type)
);
}