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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/signal.h> 34 #include <x86/specialreg.h> 35 #include <x86/trap.h> 36 #include <x86/x86_var.h> 37 38 #include <x86/linux/linux_x86.h> 39 40 #define LINUX_T_UNKNOWN 255 41 static int _bsd_to_linux_trapcode[] = { 42 LINUX_T_UNKNOWN, /* 0 */ 43 6, /* 1 T_PRIVINFLT */ 44 LINUX_T_UNKNOWN, /* 2 */ 45 3, /* 3 T_BPTFLT */ 46 LINUX_T_UNKNOWN, /* 4 */ 47 LINUX_T_UNKNOWN, /* 5 */ 48 16, /* 6 T_ARITHTRAP */ 49 254, /* 7 T_ASTFLT */ 50 LINUX_T_UNKNOWN, /* 8 */ 51 13, /* 9 T_PROTFLT */ 52 1, /* 10 T_TRCTRAP */ 53 LINUX_T_UNKNOWN, /* 11 */ 54 14, /* 12 T_PAGEFLT */ 55 LINUX_T_UNKNOWN, /* 13 */ 56 17, /* 14 T_ALIGNFLT */ 57 LINUX_T_UNKNOWN, /* 15 */ 58 LINUX_T_UNKNOWN, /* 16 */ 59 LINUX_T_UNKNOWN, /* 17 */ 60 0, /* 18 T_DIVIDE */ 61 2, /* 19 T_NMI */ 62 4, /* 20 T_OFLOW */ 63 5, /* 21 T_BOUND */ 64 7, /* 22 T_DNA */ 65 8, /* 23 T_DOUBLEFLT */ 66 9, /* 24 T_FPOPFLT */ 67 10, /* 25 T_TSSFLT */ 68 11, /* 26 T_SEGNPFLT */ 69 12, /* 27 T_STKFLT */ 70 18, /* 28 T_MCHK */ 71 19, /* 29 T_XMMFLT */ 72 15 /* 30 T_RESERVED */ 73 }; 74 75 /* 76 * If FreeBSD & Linux have a difference of opinion about what a trap 77 * means, deal with it here. 78 */ 79 int 80 linux_translate_traps(int signal, int trap_code) 81 { 82 if (signal != SIGBUS) 83 return (signal); 84 switch (trap_code) { 85 case T_PROTFLT: 86 case T_TSSFLT: 87 case T_DOUBLEFLT: 88 case T_PAGEFLT: 89 return (SIGSEGV); 90 default: 91 return (signal); 92 } 93 } 94 95 int 96 bsd_to_linux_trapcode(int code) 97 { 98 99 return (code < nitems(_bsd_to_linux_trapcode) ? 100 _bsd_to_linux_trapcode[code] : LINUX_T_UNKNOWN); 101 } 102 103 u_int 104 linux_x86_elf_hwcap2(void) 105 { 106 static u_int elf_hwcap2 = 0; 107 static bool elf_hwcap2_valid = false; 108 109 if (!elf_hwcap2_valid) { 110 if ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) 111 elf_hwcap2 |= LINUX_HWCAP2_FSGSBASE; 112 elf_hwcap2_valid = true; 113 } 114 return (elf_hwcap2); 115 } 116