76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* Helper file for i386 platform. Runtime check for MMX/SSE/SSE2 support.
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Copyright 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Used by 20020523-2.c and i386-sse-6.c, and possibly others. */
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/* Plagarized from 20020523-2.c. */
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/* Plagarized from gcc. */
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#define bit_CMOV (1 << 15)
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#define bit_MMX (1 << 23)
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#define bit_SSE (1 << 25)
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#define bit_SSE2 (1 << 26)
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#ifndef NOINLINE
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#define NOINLINE __attribute__ ((noinline))
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#endif
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unsigned int i386_cpuid (void) NOINLINE;
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unsigned int NOINLINE
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i386_cpuid (void)
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{
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int fl1, fl2;
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#ifndef __x86_64__
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/* See if we can use cpuid. On AMD64 we always can. */
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__asm__ ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
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"pushl %0; popfl; pushfl; popl %0; popfl"
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: "=&r" (fl1), "=&r" (fl2)
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: "i" (0x00200000));
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if (((fl1 ^ fl2) & 0x00200000) == 0)
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return (0);
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#endif
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/* Host supports cpuid. See if cpuid gives capabilities, try
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CPUID(0). Preserve %ebx and %ecx; cpuid insn clobbers these, we
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don't need their CPUID values here, and %ebx may be the PIC
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register. */
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#ifdef __x86_64__
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__asm__ ("pushq %%rcx; pushq %%rbx; cpuid; popq %%rbx; popq %%rcx"
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: "=a" (fl1) : "0" (0) : "rdx", "cc");
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#else
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__asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx"
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: "=a" (fl1) : "0" (0) : "edx", "cc");
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#endif
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if (fl1 == 0)
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return (0);
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/* Invoke CPUID(1), return %edx; caller can examine bits to
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determine what's supported. */
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#ifdef __x86_64__
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__asm__ ("pushq %%rcx; pushq %%rbx; cpuid; popq %%rbx; popq %%rcx"
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: "=d" (fl2), "=a" (fl1) : "1" (1) : "cc");
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#else
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__asm__ ("pushl %%ecx; pushl %%ebx; cpuid; popl %%ebx; popl %%ecx"
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: "=d" (fl2), "=a" (fl1) : "1" (1) : "cc");
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#endif
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return fl2;
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}
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