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annotate gcc/config/openbsd.h @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Base configuration file for all OpenBSD targets. |
| 145 | 2 Copyright (C) 1999-2020 Free Software Foundation, Inc. |
| 0 | 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 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 /* Common OpenBSD configuration. | |
| 21 All OpenBSD architectures include this file, which is intended as | |
| 22 a repository for common defines. | |
| 23 | |
| 24 Some defines are common to all architectures, a few of them are | |
| 25 triggered by OBSD_* guards, so that we won't override architecture | |
| 26 defaults by mistakes. | |
| 27 | |
| 28 OBSD_HAS_CORRECT_SPECS: | |
| 29 another mechanism provides correct specs already. | |
| 30 OBSD_NO_DYNAMIC_LIBRARIES: | |
| 31 no implementation of dynamic libraries. | |
| 32 OBSD_OLD_GAS: | |
| 33 older flavor of gas which needs help for PIC. | |
| 34 OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE, | |
| 35 OBSD_HAS_DECLARE_OBJECT: | |
| 36 PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas | |
| 37 the corresponding logic for OBJECTS is necessarily coupled. | |
| 38 | |
| 39 There are also a few `default' defines such as ASM_WEAKEN_LABEL, | |
| 40 intended as common ground for arch that don't provide | |
| 41 anything suitable. */ | |
| 42 | |
| 43 /* OPENBSD_NATIVE is defined only when gcc is configured as part of | |
| 44 the OpenBSD source tree, specifically through Makefile.bsd-wrapper. | |
| 45 | |
| 46 In such a case the include path can be trimmed as there is no | |
| 47 distinction between system includes and gcc includes. */ | |
| 48 | |
| 49 /* This configuration method, namely Makefile.bsd-wrapper and | |
| 50 OPENBSD_NATIVE is NOT recommended for building cross-compilers. */ | |
| 51 | |
| 52 #ifdef OPENBSD_NATIVE | |
| 53 | |
| 54 /* The compiler is configured with ONLY the gcc/g++ standard headers. */ | |
| 55 #undef INCLUDE_DEFAULTS | |
| 56 #define INCLUDE_DEFAULTS \ | |
| 57 { \ | |
| 58 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \ | |
| 59 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1 }, \ | |
| 60 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1 }, \ | |
| 111 | 61 { NATIVE_SYSTEM_HEADER_DIR, NATIVE_SYSTEM_HEADER_COMPONENT, 0, 0 }, \ |
| 0 | 62 { 0, 0, 0, 0 } \ |
| 63 } | |
| 64 | |
| 65 /* Under OpenBSD, the normal location of the various *crt*.o files is the | |
| 66 /usr/lib directory. */ | |
| 67 #undef STANDARD_STARTFILE_PREFIX | |
| 68 #define STANDARD_STARTFILE_PREFIX "/usr/local/lib/" | |
| 69 | |
| 70 #endif | |
| 71 | |
| 72 | |
| 73 /* Controlling the compilation driver. */ | |
| 74 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD targets. */ | |
| 75 #define OPENBSD_OS_CPP_BUILTINS() \ | |
| 76 do \ | |
| 77 { \ | |
| 78 builtin_define ("__OpenBSD__"); \ | |
| 79 builtin_define ("__unix__"); \ | |
| 80 builtin_define ("__ANSI_COMPAT"); \ | |
| 81 builtin_assert ("system=unix"); \ | |
| 82 builtin_assert ("system=bsd"); \ | |
| 83 builtin_assert ("system=OpenBSD"); \ | |
| 84 } \ | |
| 85 while (0) | |
| 86 | |
|
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87 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD ELF targets. */ |
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88 #define OPENBSD_OS_CPP_BUILTINS_ELF() \ |
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89 do \ |
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90 { \ |
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91 OPENBSD_OS_CPP_BUILTINS(); \ |
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92 builtin_define ("__ELF__"); \ |
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93 } \ |
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94 while (0) |
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95 |
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96 /* TARGET_OS_CPP_BUILTINS() common to all LP64 OpenBSD targets. */ |
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97 #define OPENBSD_OS_CPP_BUILTINS_LP64() \ |
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98 do \ |
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99 { \ |
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100 builtin_define ("_LP64"); \ |
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101 builtin_define ("__LP64__"); \ |
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102 } \ |
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103 while (0) |
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104 |
| 0 | 105 /* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread. |
| 106 XXX the way threads are handled currently is not very satisfying, | |
| 107 since all code must be compiled with -pthread to work. | |
| 108 This two-stage defines makes it easy to pick that for targets that | |
| 109 have subspecs. */ | |
| 110 #ifdef CPP_CPU_SPEC | |
| 111 #define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" | |
| 112 #else | |
| 113 #define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" | |
| 114 #endif | |
| 115 | |
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116 #undef LIB_SPEC |
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117 #define LIB_SPEC OBSD_LIB_SPEC |
| 0 | 118 |
| 119 #ifndef OBSD_HAS_CORRECT_SPECS | |
| 120 | |
| 121 #undef CPP_SPEC | |
| 122 #define CPP_SPEC OBSD_CPP_SPEC | |
| 123 | |
| 124 #ifdef OBSD_OLD_GAS | |
| 125 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD | |
| 126 still uses a special flavor of gas that needs to be told when generating | |
| 127 pic code. */ | |
| 128 #undef ASM_SPEC | |
| 111 | 129 #define ASM_SPEC "%{" FPIE1_OR_FPIC1_SPEC ":-k} %{" FPIE2_OR_FPIC2_SPEC ":-k -K}" |
| 0 | 130 #endif |
| 131 | |
| 132 /* Since we use gas, stdin -> - is a good idea. */ | |
| 133 #define AS_NEEDS_DASH_FOR_PIPED_INPUT | |
| 134 | |
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135 #undef LIB_SPEC |
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136 #define LIB_SPEC OBSD_LIB_SPEC |
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137 |
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138 #if defined(HAVE_LD_EH_FRAME_HDR) |
| 111 | 139 #define LINK_EH_SPEC "%{!static|static-pie:--eh-frame-hdr} " |
| 0 | 140 #endif |
| 141 | |
| 142 #undef LIB_SPEC | |
| 143 #define LIB_SPEC OBSD_LIB_SPEC | |
| 144 #endif | |
| 145 | |
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146 #define TARGET_POSIX_IO |
| 111 | 147 |
| 148 /* All new versions of OpenBSD have C99 functions. We redefine this hook | |
| 149 so the version from elfos.h header won't be used. */ | |
| 150 #undef TARGET_LIBC_HAS_FUNCTION | |
| 151 #define TARGET_LIBC_HAS_FUNCTION default_libc_has_function | |
| 152 | |
| 0 | 153 |
| 154 /* Runtime target specification. */ | |
| 155 | |
| 156 /* Miscellaneous parameters. */ | |
| 157 | |
| 158 /* Controlling debugging info: dbx options. */ | |
| 159 | |
| 160 /* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that | |
| 161 use DBX don't support it. */ | |
| 162 #define DBX_NO_XREFS | |
| 163 | |
| 164 | |
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165 /* - we use . - _func instead of a local label, |
| 0 | 166 - we put extra spaces in expressions such as |
| 167 .type _func , @function | |
| 168 This is more readable for a human being and confuses c++filt less. */ | |
| 169 | |
| 170 /* Assembler format: output and generation of labels. */ | |
| 171 | |
| 172 /* Define the strings used for the .type and .size directives. | |
| 173 These strings generally do not vary from one system running OpenBSD | |
| 174 to another, but if a given system needs to use different pseudo-op | |
| 175 names for these, they may be overridden in the arch specific file. */ | |
| 176 | |
| 177 /* OpenBSD assembler is hacked to have .type & .size support even in a.out | |
| 178 format object files. Functions size are supported but not activated | |
| 179 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). | |
| 180 SET_ASM_OP is needed for attribute alias to work. */ | |
| 181 | |
| 182 #undef TYPE_ASM_OP | |
| 183 #undef SIZE_ASM_OP | |
| 184 #undef SET_ASM_OP | |
| 185 #undef GLOBAL_ASM_OP | |
| 186 | |
| 187 #define TYPE_ASM_OP "\t.type\t" | |
| 188 #define SIZE_ASM_OP "\t.size\t" | |
| 189 #define SET_ASM_OP "\t.set\t" | |
| 190 #define GLOBAL_ASM_OP "\t.globl\t" | |
| 191 | |
| 192 /* The following macro defines the format used to output the second | |
| 193 operand of the .type assembler directive. */ | |
| 194 #undef TYPE_OPERAND_FMT | |
| 195 #define TYPE_OPERAND_FMT "@%s" | |
| 196 | |
| 197 /* Provision if extra assembler code is needed to declare a function's result | |
| 198 (taken from svr4, not needed yet actually). */ | |
| 199 #ifndef ASM_DECLARE_RESULT | |
| 200 #define ASM_DECLARE_RESULT(FILE, RESULT) | |
| 201 #endif | |
| 202 | |
| 203 /* These macros generate the special .type and .size directives which | |
| 204 are used to set the corresponding fields of the linker symbol table | |
| 205 entries under OpenBSD. These macros also have to output the starting | |
| 206 labels for the relevant functions/objects. */ | |
| 207 | |
| 208 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME | |
| 209 /* Extra assembler code needed to declare a function properly. | |
| 210 Some assemblers may also need to also have something extra said | |
| 211 about the function's return value. We allow for that here. */ | |
| 212 #undef ASM_DECLARE_FUNCTION_NAME | |
| 213 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ | |
| 214 do { \ | |
| 215 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ | |
| 216 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ | |
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217 ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \ |
| 0 | 218 } while (0) |
| 219 #endif | |
| 220 | |
| 221 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE | |
| 222 /* Declare the size of a function. */ | |
| 223 #undef ASM_DECLARE_FUNCTION_SIZE | |
| 224 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ | |
| 225 do { \ | |
| 226 if (!flag_inhibit_size_directive) \ | |
| 227 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ | |
| 228 } while (0) | |
| 229 #endif | |
| 230 | |
| 231 #ifndef OBSD_HAS_DECLARE_OBJECT | |
| 232 /* Extra assembler code needed to declare an object properly. */ | |
| 233 #undef ASM_DECLARE_OBJECT_NAME | |
| 234 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ | |
| 235 do { \ | |
| 236 HOST_WIDE_INT size; \ | |
| 237 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ | |
| 238 size_directive_output = 0; \ | |
| 239 if (!flag_inhibit_size_directive \ | |
| 240 && (DECL) && DECL_SIZE (DECL)) \ | |
| 241 { \ | |
| 242 size_directive_output = 1; \ | |
| 243 size = int_size_in_bytes (TREE_TYPE (DECL)); \ | |
| 244 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ | |
| 245 } \ | |
| 246 ASM_OUTPUT_LABEL (FILE, NAME); \ | |
| 247 } while (0) | |
| 248 | |
| 249 /* Output the size directive for a decl in rest_of_decl_compilation | |
| 250 in the case where we did not do so before the initializer. | |
| 251 Once we find the error_mark_node, we know that the value of | |
| 252 size_directive_output was set by ASM_DECLARE_OBJECT_NAME | |
| 253 when it was run for the same decl. */ | |
| 254 #undef ASM_FINISH_DECLARE_OBJECT | |
| 255 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ | |
| 256 do { \ | |
| 257 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ | |
| 258 HOST_WIDE_INT size; \ | |
| 259 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ | |
| 260 && ! AT_END && TOP_LEVEL \ | |
| 261 && DECL_INITIAL (DECL) == error_mark_node \ | |
| 262 && !size_directive_output) \ | |
| 263 { \ | |
| 264 size_directive_output = 1; \ | |
| 265 size = int_size_in_bytes (TREE_TYPE (DECL)); \ | |
| 266 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ | |
| 267 } \ | |
| 268 } while (0) | |
| 269 #endif | |
| 270 | |
| 271 | |
| 272 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need | |
| 273 to override a processor specific definition. Hence, #ifndef ASM_* | |
| 274 In case overriding turns out to be needed, one can always #undef ASM_* | |
| 275 before including this file. */ | |
| 276 | |
| 277 /* Tell the assembler that a symbol is weak. */ | |
| 278 /* Note: netbsd arm32 assembler needs a .globl here. An override may | |
| 279 be needed when/if we go for arm32 support. */ | |
| 280 #ifndef ASM_WEAKEN_LABEL | |
| 281 #define ASM_WEAKEN_LABEL(FILE,NAME) \ | |
| 282 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ | |
| 283 fputc ('\n', FILE); } while (0) | |
| 284 #endif | |
| 285 | |
| 286 /* Storage layout. */ | |
| 287 | |
| 288 | |
| 111 | 289 #define HAVE_ENABLE_EXECUTE_STACK |