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Saving %rbx may actually be required depending on the memory model.

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This commit is contained in:
Frank Denis 2014-05-07 09:01:01 -07:00
parent 95d9a625db
commit a234e505f9
1 changed files with 13 additions and 1 deletions
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14
src/libsodium/sodium/runtime.c
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@ -47,7 +47,7 @@ _cpuid(unsigned int cpu_info[4U], const unsigned int cpu_info_type)
__cpuidex((int *) cpu_info, cpu_info_type, 0);
#elif defined(HAVE_CPUID)
cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
# if defined(__i386__) && !defined(__x86_64__)
# ifdef __i386__
__asm__ __volatile__ ("pushfl; pushfl; "
"popl %0; "
"movl %0, %1; xorl %2, %0; "
@ -59,10 +59,22 @@ _cpuid(unsigned int cpu_info[4U], const unsigned int cpu_info_type)
return;
}
# endif
# ifdef __i386__
__asm__ __volatile__ ("xchgl %%ebx, %k1; cpuid; xchgl %%ebx, %k1" :
"=a" (cpu_info[0]), "=&r" (cpu_info[1]),
"=c" (cpu_info[2]), "=d" (cpu_info[3]) :
"0" (cpu_info_type), "2" (0U));
# elif defined(__x86_64__)
__asm__ __volatile__ ("xchgq %%rbx, %q1; cpuid; xchgq %%rbx, %q1" :
"=a" (cpu_info[0]), "=&r" (cpu_info[1]),
"=c" (cpu_info[2]), "=d" (cpu_info[3]) :
"0" (cpu_info_type), "2" (0U));
# else
__asm__ __volatile__ ("cpuid" :
"=a" (cpu_info[0]), "=b" (cpu_info[1]),
"=c" (cpu_info[2]), "=d" (cpu_info[3]) :
"0" (cpu_info_type), "2" (0U));
# endif
#else
cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
#endif