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5a361c3a54
Don't invoke CPUID with feature levels above the supported maximum. In this case CPUID will return the highest supported basic information leaf, which will have unrelated bits in the relevant positions.
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 2018-2018 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Xinchen Hui <xinchen.h@zend.com> |
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+----------------------------------------------------------------------+
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*/
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#include "zend_cpuinfo.h"
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typedef struct _zend_cpu_info {
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uint32_t eax;
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t initialized;
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} zend_cpu_info;
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static zend_cpu_info cpuinfo = {0};
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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# if defined(HAVE_CPUID_H) && defined(HAVE_CPUID_COUNT)
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# include <cpuid.h>
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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__cpuid_count(func, subfunc, cpuinfo->eax, cpuinfo->ebx, cpuinfo->ecx, cpuinfo->edx);
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}
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# else
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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#if defined(__i386__) && (defined(__pic__) || defined(__PIC__))
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/* PIC on i386 uses %ebx, so preserve it. */
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__asm__ __volatile__ (
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"pushl %%ebx\n"
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"cpuid\n"
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"mov %%ebx,%1\n"
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"popl %%ebx"
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: "=a"(cpuinfo->eax), "=r"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
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: "a"(func), "c"(subfunc)
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);
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#else
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__asm__ __volatile__ (
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"cpuid"
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: "=a"(cpuinfo->eax), "=b"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
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: "a"(func), "c"(subfunc)
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);
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#endif
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}
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# endif
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#elif defined(ZEND_WIN32) && !defined(__clang__)
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# include <intrin.h>
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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int regs[4];
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__cpuidex(regs, func, subfunc);
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cpuinfo->eax = regs[0];
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cpuinfo->ebx = regs[1];
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cpuinfo->ecx = regs[2];
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cpuinfo->edx = regs[3];
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}
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#else
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static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
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cpuinfo->eax = 0;
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}
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#endif
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void zend_cpu_startup(void)
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{
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if (!cpuinfo.initialized) {
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zend_cpu_info ebx;
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int max_feature;
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cpuinfo.initialized = 1;
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__zend_cpuid(0, 0, &cpuinfo);
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max_feature = cpuinfo.eax;
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if (max_feature == 0) {
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return;
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}
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__zend_cpuid(1, 0, &cpuinfo);
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/* for avx2 */
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if (max_feature >= 7) {
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__zend_cpuid(7, 0, &ebx);
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cpuinfo.ebx = ebx.ebx;
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} else {
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cpuinfo.ebx = 0;
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}
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}
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}
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ZEND_API int zend_cpu_supports(zend_cpu_feature feature) {
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if (feature & ZEND_CPU_EDX_MASK) {
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return (cpuinfo.edx & (feature & ~ZEND_CPU_EDX_MASK));
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} else if (feature & ZEND_CPU_EBX_MASK) {
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return (cpuinfo.ebx & (feature & ~ZEND_CPU_EBX_MASK));
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} else {
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return (cpuinfo.ecx & feature);
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}
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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*/
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