old-cross-binutils/gdb/testsuite/gdb.arch/i386-cpuid.h
Joel Brobecker a9762ec78a Switch the license of all .c files to GPLv3.
Switch the license of all .h files to GPLv3.
        Switch the license of all .cc files to GPLv3.
2007-08-23 18:08:50 +00:00

75 lines
2.4 KiB
C

/* Helper file for i386 platform. Runtime check for MMX/SSE/SSE2 support.
Copyright 2004, 2007 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;
}