1 /*- 2 * Copyright (c) 2018 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #include <machine/specialreg.h> 28 #include <machine/cpufunc.h> 29 30 static uint32_t cpu_feature, cpu_feature2; 31 static uint32_t cpu_stdext_feature, cpu_stdext_feature2; 32 33 static void 34 init_cpu_features(void) 35 { 36 u_int p[4]; 37 38 do_cpuid(1, p); 39 cpu_feature = p[3]; 40 cpu_feature2 = p[2]; 41 do_cpuid(0, p); 42 if (p[0] >= 7) { 43 cpuid_count(7, 0, p); 44 cpu_stdext_feature = p[1]; 45 cpu_stdext_feature2 = p[2]; 46 } else { 47 cpu_stdext_feature = 0; 48 cpu_stdext_feature2 = 0; 49 } 50 } 51 52 static void 53 crt1_handle_rela(const Elf_Rela *r) 54 { 55 Elf_Addr *ptr, *where, target; 56 57 switch (ELF_R_TYPE(r->r_info)) { 58 case R_X86_64_IRELATIVE: 59 ptr = (Elf_Addr *)r->r_addend; 60 where = (Elf_Addr *)r->r_offset; 61 target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, 62 uint32_t))ptr)(cpu_feature, cpu_feature2, 63 cpu_stdext_feature, cpu_stdext_feature2); 64 *where = target; 65 break; 66 } 67 } 68