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 ifunc_init(const Elf_Auxinfo *aux) 28 { 29 /* Digest the auxiliary vector. */ 30 for (; aux->a_type != AT_NULL; aux++) { 31 switch (aux->a_type) { 32 case AT_HWCAP: 33 cpu_features = (uint32_t)aux->a_un.a_val; 34 break; 35 case AT_HWCAP2: 36 cpu_features2 = (uint32_t)aux->a_un.a_val; 37 break; 38 } 39 } 40 } 41 42 static void 43 crt1_handle_rela(const Elf_Rela *r) 44 { 45 typedef Elf_Addr (*ifunc_resolver_t)( 46 uint32_t, uint32_t, uint64_t, uint64_t, 47 uint64_t, uint64_t, uint64_t, uint64_t); 48 Elf_Addr *ptr, *where, target; 49 50 switch (ELF_R_TYPE(r->r_info)) { 51 case R_PPC_IRELATIVE: 52 ptr = (Elf_Addr *)r->r_addend; 53 where = (Elf_Addr *)r->r_offset; 54 target = ((ifunc_resolver_t)ptr)(cpu_features, cpu_features2, 55 0, 0, 0, 0, 0, 0); 56 *where = target; 57 break; 58 } 59 } 60