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 p[4];
38
39 do_cpuid(1, p);
40 cpu_feature = p[3];
41 cpu_feature2 = p[2];
42 do_cpuid(0, p);
43 if (p[0] >= 7) {
44 cpuid_count(7, 0, p);
45 cpu_stdext_feature = p[1];
46 cpu_stdext_feature2 = p[2];
47 } else {
48 cpu_stdext_feature = 0;
49 cpu_stdext_feature2 = 0;
50 }
51 }
52
53 static void
crt1_handle_rela(const Elf_Rela * r)54 crt1_handle_rela(const Elf_Rela *r)
55 {
56 Elf_Addr *ptr, *where, target;
57
58 switch (ELF_R_TYPE(r->r_info)) {
59 case R_X86_64_IRELATIVE:
60 ptr = (Elf_Addr *)r->r_addend;
61 where = (Elf_Addr *)r->r_offset;
62 target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
63 uint32_t))ptr)(cpu_feature, cpu_feature2,
64 cpu_stdext_feature, cpu_stdext_feature2);
65 *where = target;
66 break;
67 }
68 }
69