1 /* Definitions for option handling for IA-32.
2    Copyright (C) 1988-2022 Free Software Foundation, Inc.
3 
4 This file is part of GCC.
5 
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10 
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 GNU General Public License for more details.
15 
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19 
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23 <http://www.gnu.org/licenses/>.  */
24 
25 #ifndef I386_OPTS_H
26 #define I386_OPTS_H
27 
28 /* Algorithm to expand string function with.  */
29 enum stringop_alg
30 {
31 #undef DEF_ALG
32 #define DEF_ALG(alg, name) alg,
33 
34 #include "stringop.def"
35 last_alg
36 
37 #undef DEF_ALG
38 };
39 
40 /* Available call abi.  */
41 enum calling_abi
42 {
43   SYSV_ABI = 0,
44   MS_ABI = 1
45 };
46 
47 enum fpmath_unit
48 {
49   FPMATH_387 = 1,
50   FPMATH_SSE = 2
51 };
52 
53 enum tls_dialect
54 {
55   TLS_DIALECT_GNU,
56   TLS_DIALECT_GNU2,
57   TLS_DIALECT_SUN
58 };
59 
60 enum cmodel {
61   CM_32,  /* The traditional 32-bit ABI.  */
62   CM_SMALL,         /* Assumes all code and data fits in the low 31 bits.  */
63   CM_KERNEL,        /* Assumes all code and data fits in the high 31 bits.  */
64   CM_MEDIUM,        /* Assumes code fits in the low 31 bits; data unlimited.  */
65   CM_LARGE,         /* No assumptions.  */
66   CM_SMALL_PIC,     /* Assumes code+data+got/plt fits in a 31 bit region.  */
67   CM_MEDIUM_PIC,/* Assumes code+got/plt fits in a 31 bit region.  */
68   CM_LARGE_PIC      /* No assumptions.  */
69 };
70 
71 enum pmode {
72   PMODE_SI,         /* Pmode == SImode. */
73   PMODE_DI          /* Pmode == DImode. */
74 };
75 
76 enum ix86_align_data {
77   ix86_align_data_type_compat,
78   ix86_align_data_type_abi,
79   ix86_align_data_type_cacheline
80 };
81 
82 enum asm_dialect {
83   ASM_ATT,
84   ASM_INTEL
85 };
86 
87 enum ix86_veclibabi {
88   ix86_veclibabi_type_none,
89   ix86_veclibabi_type_svml,
90   ix86_veclibabi_type_acml
91 };
92 
93 enum stack_protector_guard {
94   SSP_TLS,      /* per-thread canary in TLS block */
95   SSP_GLOBAL    /* global canary */
96 };
97 
98 enum prefer_vector_width {
99     PVW_NONE,
100     PVW_AVX128,
101     PVW_AVX256,
102     PVW_AVX512
103 };
104 
105 /* This is used to mitigate variant #2 of the speculative execution
106    vulnerabilities on x86 processors identified by CVE-2017-5715, aka
107    Spectre.  They convert indirect branches and function returns to
108    call and return thunks to avoid speculative execution via indirect
109    call, jmp and ret.  */
110 enum indirect_branch {
111   indirect_branch_unset = 0,
112   indirect_branch_keep,
113   indirect_branch_thunk,
114   indirect_branch_thunk_inline,
115   indirect_branch_thunk_extern
116 };
117 
118 enum instrument_return {
119   instrument_return_none = 0,
120   instrument_return_call,
121   instrument_return_nop5
122 };
123 
124 enum harden_sls {
125   harden_sls_none = 0,
126   harden_sls_return = 1 << 0,
127   harden_sls_indirect_jmp = 1 << 1,
128   harden_sls_all = harden_sls_return | harden_sls_indirect_jmp
129 };
130 
131 #endif
132