/* Helper file for i386 platform. Runtime check for MMX/SSE/SSE2 support. Copyright 2004 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Used by 20020523-2.c and i386-sse-6.c, and possibly others. */ /* Plagarized from 20020523-2.c. */ /* Plagarized from gcc. */ #define bit_CMOV (1 << 15) #define bit_MMX (1 << 23) #define bit_SSE (1 << 25) #define bit_SSE2 (1 << 26) #ifndef NOINLINE #define NOINLINE __attribute__ ((noinline)) #endif unsigned int i386_cpuid (void) NOINLINE; unsigned int NOINLINE i386_cpuid (void) { int fl1, fl2; #ifndef __x86_64__ /* See if we can use cpuid. On AMD64 we always can. */ __asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;" "pushl %0; popfl; pushfl; popl %0; popfl" : "=&r" (fl1), "=&r" (fl2) : "i" (0x00200000)); if (((fl1 ^ fl2) & 0x00200000) == 0) return (0); #endif /* Host supports cpuid. See if cpuid gives capabilities, try CPUID(0). Preserve %ebx and %ecx; cpuid insn clobbers these, we don't need their CPUID values here, and %ebx may be the PIC register. */ #ifdef __x86_64__ __asm__ ("pushq %%rcx; pushq %%rbx; cpuid; popq %%rbx; popq %%rcx" : "=a" (fl1) : "0" (0) : "rdx", "cc"); #else __asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx" : "=a" (fl1) : "0" (0) : "edx", "cc"); #endif if (fl1 == 0) return (0); /* Invoke CPUID(1), return %edx; caller can examine bits to determine what's supported. */ #ifdef __x86_64__ __asm__ ("pushq %%rcx; pushq %%rbx; cpuid; popq %%rbx; popq %%rcx" : "=d" (fl2), "=a" (fl1) : "1" (1) : "cc"); #else __asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx" : "=d" (fl2), "=a" (fl1) : "1" (1) : "cc"); #endif return fl2; }