1 /*- 2 * Copyright (c) 2019 Leandro Lupori 3 * Copyright (c) 2024 Jessica Clarke <jrtc27@FreeBSD.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 12 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 13 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 14 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 15 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 16 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 17 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 18 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 19 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 20 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 21 * SUCH DAMAGE. 22 */ 23 24 static unsigned long elf_hwcap; 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 elf_hwcap = (uint32_t)aux->a_un.a_val; 34 break; 35 } 36 } 37 } 38 39 static void 40 crt1_handle_rela(const Elf_Rela *r) 41 { 42 typedef Elf_Addr (*ifunc_resolver_t)( 43 unsigned long, unsigned long, unsigned long, unsigned long, 44 unsigned long, unsigned long, unsigned long, unsigned long); 45 Elf_Addr *ptr, *where, target; 46 47 switch (ELF_R_TYPE(r->r_info)) { 48 case R_RISCV_IRELATIVE: 49 ptr = (Elf_Addr *)r->r_addend; 50 where = (Elf_Addr *)r->r_offset; 51 target = ((ifunc_resolver_t)ptr)(elf_hwcap, 52 0, 0, 0, 0, 0, 0, 0); 53 *where = target; 54 break; 55 } 56 } 57