1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1994-1996 Søren Schmidt 5 * All rights reserved. 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/param.h> 30 #include <sys/signal.h> 31 #include <x86/specialreg.h> 32 #include <x86/trap.h> 33 #include <x86/x86_var.h> 34 35 #include <x86/linux/linux_x86.h> 36 37 #define LINUX_T_UNKNOWN 255 38 static int _bsd_to_linux_trapcode[] = { 39 LINUX_T_UNKNOWN, /* 0 */ 40 6, /* 1 T_PRIVINFLT */ 41 LINUX_T_UNKNOWN, /* 2 */ 42 3, /* 3 T_BPTFLT */ 43 LINUX_T_UNKNOWN, /* 4 */ 44 LINUX_T_UNKNOWN, /* 5 */ 45 16, /* 6 T_ARITHTRAP */ 46 254, /* 7 T_ASTFLT */ 47 LINUX_T_UNKNOWN, /* 8 */ 48 13, /* 9 T_PROTFLT */ 49 1, /* 10 T_TRCTRAP */ 50 LINUX_T_UNKNOWN, /* 11 */ 51 14, /* 12 T_PAGEFLT */ 52 LINUX_T_UNKNOWN, /* 13 */ 53 17, /* 14 T_ALIGNFLT */ 54 LINUX_T_UNKNOWN, /* 15 */ 55 LINUX_T_UNKNOWN, /* 16 */ 56 LINUX_T_UNKNOWN, /* 17 */ 57 0, /* 18 T_DIVIDE */ 58 2, /* 19 T_NMI */ 59 4, /* 20 T_OFLOW */ 60 5, /* 21 T_BOUND */ 61 7, /* 22 T_DNA */ 62 8, /* 23 T_DOUBLEFLT */ 63 9, /* 24 T_FPOPFLT */ 64 10, /* 25 T_TSSFLT */ 65 11, /* 26 T_SEGNPFLT */ 66 12, /* 27 T_STKFLT */ 67 18, /* 28 T_MCHK */ 68 19, /* 29 T_XMMFLT */ 69 15 /* 30 T_RESERVED */ 70 }; 71 72 /* 73 * If FreeBSD & Linux have a difference of opinion about what a trap 74 * means, deal with it here. 75 */ 76 int 77 linux_translate_traps(int signal, int trap_code) 78 { 79 if (signal != SIGBUS) 80 return (signal); 81 switch (trap_code) { 82 case T_PROTFLT: 83 case T_TSSFLT: 84 case T_DOUBLEFLT: 85 case T_PAGEFLT: 86 return (SIGSEGV); 87 default: 88 return (signal); 89 } 90 } 91 92 int 93 bsd_to_linux_trapcode(int code) 94 { 95 96 return (code < nitems(_bsd_to_linux_trapcode) ? 97 _bsd_to_linux_trapcode[code] : LINUX_T_UNKNOWN); 98 } 99 100 u_int 101 linux_x86_elf_hwcap2(void) 102 { 103 static u_int elf_hwcap2 = 0; 104 static bool elf_hwcap2_valid = false; 105 106 if (!elf_hwcap2_valid) { 107 if ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) 108 elf_hwcap2 |= LINUX_HWCAP2_FSGSBASE; 109 elf_hwcap2_valid = true; 110 } 111 return (elf_hwcap2); 112 } 113