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
linux_translate_traps(int signal,int trap_code)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
bsd_to_linux_trapcode(int code)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
linux_x86_elf_hwcap2(void)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