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 #include <sys/cdefs.h> 24 static uint32_t cpu_features; 25 static uint32_t cpu_features2; 26 27 static void 28 init_cpu_features(char **env) 29 { 30 const Elf_Auxinfo *aux; 31 32 /* Find the auxiliary vector on the stack. */ 33 while (*env++ != 0) /* Skip over environment, and NULL terminator */ 34 ; 35 aux = (const Elf_Auxinfo *)env; 36 37 /* Digest the auxiliary vector. */ 38 for (; aux->a_type != AT_NULL; aux++) { 39 switch (aux->a_type) { 40 case AT_HWCAP: 41 cpu_features = (uint32_t)aux->a_un.a_val; 42 break; 43 case AT_HWCAP2: 44 cpu_features2 = (uint32_t)aux->a_un.a_val; 45 break; 46 } 47 } 48 } 49 50 static void 51 crt1_handle_rela(const Elf_Rela *r) 52 { 53 typedef Elf_Addr (*ifunc_resolver_t)( 54 uint32_t, uint32_t, uint64_t, uint64_t, 55 uint64_t, uint64_t, uint64_t, uint64_t); 56 Elf_Addr *ptr, *where, target; 57 58 switch (ELF_R_TYPE(r->r_info)) { 59 case R_PPC_IRELATIVE: 60 ptr = (Elf_Addr *)r->r_addend; 61 where = (Elf_Addr *)r->r_offset; 62 target = ((ifunc_resolver_t)ptr)(cpu_features, cpu_features2, 63 0, 0, 0, 0, 0, 0); 64 *where = target; 65 break; 66 } 67 } 68