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 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/12/lib/csu/amd64/reloc.c 339351 2018-10-13 23:52:55Z kib $");
31
32 #include <machine/specialreg.h>
33 #include <machine/cpufunc.h>
34
35 static void
crt1_handle_rela(const Elf_Rela * r)36 crt1_handle_rela(const Elf_Rela *r)
37 {
38 Elf_Addr *ptr, *where, target;
39 u_int p[4];
40 uint32_t cpu_feature, cpu_feature2;
41 uint32_t cpu_stdext_feature, cpu_stdext_feature2;
42
43 do_cpuid(1, p);
44 cpu_feature = p[3];
45 cpu_feature2 = p[2];
46 do_cpuid(0, p);
47 if (p[0] >= 7) {
48 cpuid_count(7, 0, p);
49 cpu_stdext_feature = p[1];
50 cpu_stdext_feature2 = p[2];
51 } else {
52 cpu_stdext_feature = 0;
53 cpu_stdext_feature2 = 0;
54 }
55
56 switch (ELF_R_TYPE(r->r_info)) {
57 case R_X86_64_IRELATIVE:
58 ptr = (Elf_Addr *)r->r_addend;
59 where = (Elf_Addr *)r->r_offset;
60 target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t,
61 uint32_t))ptr)(cpu_feature, cpu_feature2,
62 cpu_stdext_feature, cpu_stdext_feature2);
63 *where = target;
64 break;
65 }
66 }
67