1 /*- 2 * Copyright (c) 2019 Leandro Lupori 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 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 20 * SUCH DAMAGE. 21 */ 22 23 static uint32_t cpu_features; 24 static uint32_t cpu_features2; 25 26 static void 27 init_cpu_features(char **env) 28 { 29 const Elf_Auxinfo *aux; 30 31 /* Find the auxiliary vector on the stack. */ 32 while (*env++ != 0) /* Skip over environment, and NULL terminator */ 33 ; 34 aux = (const Elf_Auxinfo *)env; 35 36 /* Digest the auxiliary vector. */ 37 for (; aux->a_type != AT_NULL; aux++) { 38 switch (aux->a_type) { 39 case AT_HWCAP: 40 cpu_features = (uint32_t)aux->a_un.a_val; 41 break; 42 case AT_HWCAP2: 43 cpu_features2 = (uint32_t)aux->a_un.a_val; 44 break; 45 } 46 } 47 } 48 49 static void 50 crt1_handle_rela(const Elf_Rela *r) 51 { 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; 56 57 switch (ELF_R_TYPE(r->r_info)) { 58 case R_PPC_IRELATIVE: 59 ptr = (Elf_Addr *)r->r_addend; 60 where = (Elf_Addr *)r->r_offset; 61 target = ((ifunc_resolver_t)ptr)(cpu_features, cpu_features2, 62 0, 0, 0, 0, 0, 0); 63 *where = target; 64 break; 65 } 66 } 67