86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
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/*-
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* Copyright (c) 2018 The FreeBSD Foundation
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <machine/specialreg.h>
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#include <machine/cpufunc.h>
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static void
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crt1_handle_rel(const Elf_Rel *r)
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{
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Elf_Addr *where, target;
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u_int cpuid_supported, p[4];
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uint32_t cpu_feature, cpu_feature2;
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uint32_t cpu_stdext_feature, cpu_stdext_feature2;
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__asm __volatile(
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" pushfl\n"
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" popl %%eax\n"
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" movl %%eax,%%ecx\n"
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" xorl $0x200000,%%eax\n"
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" pushl %%eax\n"
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" popfl\n"
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" pushfl\n"
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" popl %%eax\n"
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" xorl %%eax,%%ecx\n"
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" je 1f\n"
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" movl $1,%0\n"
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" jmp 2f\n"
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"1: movl $0,%0\n"
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"2:\n"
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: "=r" (cpuid_supported) : : "eax", "ecx", "cc");
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if (cpuid_supported) {
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do_cpuid(1, p);
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cpu_feature = p[3];
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cpu_feature2 = p[2];
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do_cpuid(0, p);
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if (p[0] >= 7) {
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cpuid_count(7, 0, p);
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cpu_stdext_feature = p[1];
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cpu_stdext_feature2 = p[2];
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} else {
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cpu_stdext_feature = 0;
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cpu_stdext_feature2 = 0;
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}
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} else {
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cpu_feature = 0;
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cpu_feature2 = 0;
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cpu_stdext_feature = 0;
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cpu_stdext_feature2 = 0;
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}
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switch (ELF_R_TYPE(r->r_info)) {
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case R_386_IRELATIVE:
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where = (Elf_Addr *)r->r_offset;
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target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
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uint32_t))*where)(cpu_feature, cpu_feature2,
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cpu_stdext_feature, cpu_stdext_feature2);
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*where = target;
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break;
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}
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}
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