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