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95b93c6e | 1 | /* Assembler macros for x86. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
95b93c6e L |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef _X86_SYSDEP_H | |
20 | #define _X86_SYSDEP_H 1 | |
21 | ||
22 | #include <sysdeps/generic/sysdep.h> | |
23 | ||
ebff9c5c L |
24 | /* __CET__ is defined by GCC with Control-Flow Protection values: |
25 | ||
26 | enum cf_protection_level | |
27 | { | |
28 | CF_NONE = 0, | |
29 | CF_BRANCH = 1 << 0, | |
30 | CF_RETURN = 1 << 1, | |
31 | CF_FULL = CF_BRANCH | CF_RETURN, | |
32 | CF_SET = 1 << 2 | |
33 | }; | |
34 | */ | |
35 | ||
36 | /* Set if CF_BRANCH (IBT) is enabled. */ | |
37 | #define X86_FEATURE_1_IBT (1U << 0) | |
38 | /* Set if CF_RETURN (SHSTK) is enabled. */ | |
39 | #define X86_FEATURE_1_SHSTK (1U << 1) | |
40 | ||
41 | #ifdef __CET__ | |
42 | # define CET_ENABLED 1 | |
43 | # define IBT_ENABLED (__CET__ & X86_FEATURE_1_IBT) | |
44 | # define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK) | |
45 | #else | |
46 | # define CET_ENABLED 0 | |
47 | # define IBT_ENABLED 0 | |
48 | # define SHSTK_ENABLED 0 | |
49 | #endif | |
50 | ||
fb4c32ae L |
51 | /* Offset for fxsave/xsave area used by _dl_runtime_resolve. Also need |
52 | space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX. It must be | |
53 | aligned to 16 bytes for fxsave and 64 bytes for xsave. */ | |
54 | #define STATE_SAVE_OFFSET (8 * 7 + 8) | |
55 | ||
56 | /* Save SSE, AVX, AVX512, mask and bound registers. */ | |
57 | #define STATE_SAVE_MASK \ | |
58 | ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7)) | |
59 | ||
95b93c6e L |
60 | #ifdef __ASSEMBLER__ |
61 | ||
62 | /* Syntactic details of assembler. */ | |
63 | ||
f753fa7d L |
64 | #ifdef _CET_ENDBR |
65 | # define _CET_NOTRACK notrack | |
66 | #else | |
67 | # define _CET_ENDBR | |
68 | # define _CET_NOTRACK | |
69 | #endif | |
70 | ||
95b93c6e L |
71 | /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ |
72 | #define ALIGNARG(log2) 1<<log2 | |
73 | #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; | |
74 | ||
75 | /* Define an entry point visible from C. */ | |
76 | #define ENTRY(name) \ | |
77 | .globl C_SYMBOL_NAME(name); \ | |
78 | .type C_SYMBOL_NAME(name),@function; \ | |
79 | .align ALIGNARG(4); \ | |
80 | C_LABEL(name) \ | |
81 | cfi_startproc; \ | |
f753fa7d | 82 | _CET_ENDBR; \ |
95b93c6e L |
83 | CALL_MCOUNT |
84 | ||
85 | #undef END | |
86 | #define END(name) \ | |
87 | cfi_endproc; \ | |
88 | ASM_SIZE_DIRECTIVE(name) | |
89 | ||
90 | #define ENTRY_CHK(name) ENTRY (name) | |
91 | #define END_CHK(name) END (name) | |
92 | ||
93 | /* Since C identifiers are not normally prefixed with an underscore | |
94 | on this system, the asm identifier `syscall_error' intrudes on the | |
95 | C name space. Make sure we use an innocuous name. */ | |
96 | #define syscall_error __syscall_error | |
97 | #define mcount _mcount | |
98 | ||
99 | #undef PSEUDO_END | |
100 | #define PSEUDO_END(name) \ | |
101 | END (name) | |
102 | ||
103 | /* Local label name for asm code. */ | |
104 | #ifndef L | |
105 | /* ELF-like local names start with `.L'. */ | |
106 | # define L(name) .L##name | |
107 | #endif | |
108 | ||
109 | #define atom_text_section .section ".text.atom", "ax" | |
110 | ||
111 | #endif /* __ASSEMBLER__ */ | |
112 | ||
113 | #endif /* _X86_SYSDEP_H */ |