2 * Copyright (c) 2019 Leandro Lupori
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
10 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
11 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
12 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
14 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
15 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
16 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
18 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
19 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 static uint32_t cpu_features;
24 static uint32_t cpu_features2;
27 init_cpu_features(char **env)
29 const Elf_Auxinfo *aux;
31 /* Find the auxiliary vector on the stack. */
32 while (*env++ != 0) /* Skip over environment, and NULL terminator */
34 aux = (const Elf_Auxinfo *)env;
36 /* Digest the auxiliary vector. */
37 for (; aux->a_type != AT_NULL; aux++) {
38 switch (aux->a_type) {
40 cpu_features = (uint32_t)aux->a_un.a_val;
43 cpu_features2 = (uint32_t)aux->a_un.a_val;
50 crt1_handle_rela(const Elf_Rela *r)
52 typedef Elf_Addr (*ifunc_resolver_t)(
53 uint32_t, uint32_t, uint64_t, uint64_t,
54 uint64_t, uint64_t, uint64_t, uint64_t);
55 Elf_Addr *ptr, *where, target;
57 switch (ELF_R_TYPE(r->r_info)) {
59 ptr = (Elf_Addr *)r->r_addend;
60 where = (Elf_Addr *)r->r_offset;
61 target = ((ifunc_resolver_t)ptr)(cpu_features, cpu_features2,