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 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <machine/specialreg.h> 33#include <machine/cpufunc.h> 34 35static void 36crt1_handle_rel(const Elf_Rel *r) 37{ 38 Elf_Addr *where, target; 39 u_int cpuid_supported, p[4]; 40 uint32_t cpu_feature, cpu_feature2; 41 uint32_t cpu_stdext_feature, cpu_stdext_feature2; 42 43 __asm __volatile( 44 " pushfl\n" 45 " popl %%eax\n" 46 " movl %%eax,%%ecx\n" 47 " xorl $0x200000,%%eax\n" 48 " pushl %%eax\n" 49 " popfl\n" 50 " pushfl\n" 51 " popl %%eax\n" 52 " xorl %%eax,%%ecx\n" 53 " je 1f\n" 54 " movl $1,%0\n" 55 " jmp 2f\n" 56 "1: movl $0,%0\n" 57 "2:\n" 58 : "=r" (cpuid_supported) : : "eax", "ecx", "cc"); 59 if (cpuid_supported) { 60 do_cpuid(1, p); 61 cpu_feature = p[3]; 62 cpu_feature2 = p[2]; 63 do_cpuid(0, p); 64 if (p[0] >= 7) { 65 cpuid_count(7, 0, p); 66 cpu_stdext_feature = p[1]; 67 cpu_stdext_feature2 = p[2]; 68 } else { 69 cpu_stdext_feature = 0; 70 cpu_stdext_feature2 = 0; 71 } 72 } else { 73 cpu_feature = 0; 74 cpu_feature2 = 0; 75 cpu_stdext_feature = 0; 76 cpu_stdext_feature2 = 0; 77 } 78 79 switch (ELF_R_TYPE(r->r_info)) { 80 case R_386_IRELATIVE: 81 where = (Elf_Addr *)r->r_offset; 82 target = ((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, 83 uint32_t))*where)(cpu_feature, cpu_feature2, 84 cpu_stdext_feature, cpu_stdext_feature2); 85 *where = target; 86 break; 87 } 88} 89