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
28 #include <machine/specialreg.h>
29 #include <machine/cpufunc.h>
30
31 static uint32_t cpu_feature, cpu_feature2;
32 static uint32_t cpu_stdext_feature, cpu_stdext_feature2;
33
34 static void
ifunc_init(const Elf_Auxinfo * aux __unused)35 ifunc_init(const Elf_Auxinfo *aux __unused)
36 {
37 u_int cpuid_supported, p[4];
38
39 __asm __volatile(
40 " pushfl\n"
41 " popl %%eax\n"
42 " movl %%eax,%%ecx\n"
43 " xorl $0x200000,%%eax\n"
44 " pushl %%eax\n"
45 " popfl\n"
46 " pushfl\n"
47 " popl %%eax\n"
48 " xorl %%eax,%%ecx\n"
49 " je 1f\n"
50 " movl $1,%0\n"
51 " jmp 2f\n"
52 "1: movl $0,%0\n"
53 "2:\n"
54 : "=r" (cpuid_supported) : : "eax", "ecx", "cc");
55 if (cpuid_supported) {
56 do_cpuid(1, p);
57 cpu_feature = p[3];
58 cpu_feature2 = p[2];
59 do_cpuid(0, p);
60 if (p[0] >= 7) {
61 cpuid_count(7, 0, p);
62 cpu_stdext_feature = p[1];
63 cpu_stdext_feature2 = p[2];
64 } else {
65 cpu_stdext_feature = 0;
66 cpu_stdext_feature2 = 0;
67 }
68 } else {
69 cpu_feature = 0;
70 cpu_feature2 = 0;
71 cpu_stdext_feature = 0;
72 cpu_stdext_feature2 = 0;
73 }
74 }
75
76 static void
crt1_handle_rel(const Elf_Rel * r)77 crt1_handle_rel(const Elf_Rel *r)
78 {
79 Elf_Addr *where, target;
80
81 switch (ELF_R_TYPE(r->r_info)) {
82 case R_386_IRELATIVE:
83 where = (Elf_Addr *)r->r_offset;
84 target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
85 uint32_t))*where)(cpu_feature, cpu_feature2,
86 cpu_stdext_feature, cpu_stdext_feature2);
87 *where = target;
88 break;
89 }
90 }
91