1/*-
2 * Copyright (c) 2018 The FreeBSD Foundation
3 *
4 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
5 * under sponsorship from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD$");
28
29#include <machine/specialreg.h>
30#include <machine/cpufunc.h>
31
32static void
33crt1_handle_rel(const Elf_Rel *r)
34{
35	Elf_Addr *where, target;
36	u_int cpuid_supported, p[4];
37	uint32_t cpu_feature, cpu_feature2;
38	uint32_t cpu_stdext_feature, cpu_stdext_feature2;
39
40	__asm __volatile(
41	    "	pushfl\n"
42	    "	popl	%%eax\n"
43	    "	movl    %%eax,%%ecx\n"
44	    "	xorl    $0x200000,%%eax\n"
45	    "	pushl	%%eax\n"
46	    "	popfl\n"
47	    "	pushfl\n"
48	    "	popl    %%eax\n"
49	    "	xorl    %%eax,%%ecx\n"
50	    "	je	1f\n"
51	    "	movl	$1,%0\n"
52	    "	jmp	2f\n"
53	    "1:	movl	$0,%0\n"
54	    "2:\n"
55	    : "=r" (cpuid_supported) : : "eax", "ecx", "cc");
56	if (cpuid_supported) {
57		do_cpuid(1, p);
58		cpu_feature = p[3];
59		cpu_feature2 = p[2];
60		do_cpuid(0, p);
61		if (p[0] >= 7) {
62			cpuid_count(7, 0, p);
63			cpu_stdext_feature = p[1];
64			cpu_stdext_feature2 = p[2];
65		} else {
66			cpu_stdext_feature = 0;
67			cpu_stdext_feature2 = 0;
68		}
69	} else {
70		cpu_feature = 0;
71		cpu_feature2 = 0;
72		cpu_stdext_feature = 0;
73		cpu_stdext_feature2 = 0;
74	}
75
76	switch (ELF_R_TYPE(r->r_info)) {
77	case R_386_IRELATIVE:
78		where = (Elf_Addr *)r->r_offset;
79		target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
80		    uint32_t))*where)(cpu_feature, cpu_feature2,
81		    cpu_stdext_feature, cpu_stdext_feature2);
82		*where = target;
83		break;
84	}
85}
86