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/* Helper file for i386 platform. Runtime check for MMX/SSE/SSE2 support.
Copyright 2004, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
/* 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;
}
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