1 /*- 2 * Copyright (c) 2019 Leandro Lupori 3 * Copyright (c) 2021 The FreeBSD Foundation 4 * 5 * Portions of this software were developed by Andrew Turner 6 * under sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 #include <machine/ifunc.h> 29 30 static __ifunc_arg_t ifunc_arg; 31 32 static void 33 ifunc_init(const Elf_Auxinfo *aux) 34 { 35 ifunc_arg._size = sizeof(ifunc_arg); 36 ifunc_arg._hwcap = 0; 37 ifunc_arg._hwcap2 = 0; 38 ifunc_arg._hwcap3 = 0; 39 ifunc_arg._hwcap4 = 0; 40 41 for (; aux->a_type != AT_NULL; aux++) { 42 switch (aux->a_type) { 43 case AT_HWCAP: 44 ifunc_arg._hwcap = aux->a_un.a_val | _IFUNC_ARG_HWCAP; 45 break; 46 case AT_HWCAP2: 47 ifunc_arg._hwcap2 = aux->a_un.a_val; 48 break; 49 case AT_HWCAP3: 50 ifunc_arg._hwcap3 = aux->a_un.a_val; 51 break; 52 case AT_HWCAP4: 53 ifunc_arg._hwcap4 = aux->a_un.a_val; 54 break; 55 } 56 } 57 } 58 59 static void 60 crt1_handle_rela(const Elf_Rela *r) 61 { 62 typedef Elf_Addr (*ifunc_resolver_t)( 63 uint64_t, const __ifunc_arg_t *, uint64_t, uint64_t, 64 uint64_t, uint64_t, uint64_t, uint64_t); 65 Elf_Addr *ptr, *where, target; 66 67 switch (ELF_R_TYPE(r->r_info)) { 68 case R_AARCH64_IRELATIVE: 69 ptr = (Elf_Addr *)r->r_addend; 70 where = (Elf_Addr *)r->r_offset; 71 target = ((ifunc_resolver_t)ptr)(ifunc_arg._hwcap, &ifunc_arg, 0, 0, 0, 0, 0, 0); 72 *where = target; 73 break; 74 } 75 } 76