1 /* Base configuration file for all OpenBSD targets. 2 Copyright (C) 1999-2013 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 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 }, \ 61 { NATIVE_SYSTEM_HEADER_DIR, NATIVE_SYSTEM_HEADER_COMPONENT, 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 87 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD ELF targets. */ 88 #define OPENBSD_OS_CPP_BUILTINS_ELF() \ 89 do \ 90 { \ 91 OPENBSD_OS_CPP_BUILTINS(); \ 92 builtin_define ("__ELF__"); \ 93 } \ 94 while (0) 95 96 /* TARGET_OS_CPP_BUILTINS() common to all LP64 OpenBSD targets. */ 97 #define OPENBSD_OS_CPP_BUILTINS_LP64() \ 98 do \ 99 { \ 100 builtin_define ("_LP64"); \ 101 builtin_define ("__LP64__"); \ 102 } \ 103 while (0) 104 105 /* 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 115 116 #undef LIB_SPEC 117 #define LIB_SPEC OBSD_LIB_SPEC 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 129 #define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}" 130 #endif 131 132 /* Since we use gas, stdin -> - is a good idea. */ 133 #define AS_NEEDS_DASH_FOR_PIPED_INPUT 134 135 #undef LIB_SPEC 136 #define LIB_SPEC OBSD_LIB_SPEC 137 138 #if defined(HAVE_LD_EH_FRAME_HDR) 139 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} " 140 #endif 141 142 #undef LIB_SPEC 143 #define LIB_SPEC OBSD_LIB_SPEC 144 #endif 145 146 #define TARGET_POSIX_IO 147 148 /* All new versions of OpenBSD have C99 functions. */ 149 #define TARGET_C99_FUNCTIONS 1 150 151 152 /* Runtime target specification. */ 153 154 /* Miscellaneous parameters. */ 155 156 /* Controlling debugging info: dbx options. */ 157 158 /* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that 159 use DBX don't support it. */ 160 #define DBX_NO_XREFS 161 162 163 /* - we use . - _func instead of a local label, 164 - we put extra spaces in expressions such as 165 .type _func , @function 166 This is more readable for a human being and confuses c++filt less. */ 167 168 /* Assembler format: output and generation of labels. */ 169 170 /* Define the strings used for the .type and .size directives. 171 These strings generally do not vary from one system running OpenBSD 172 to another, but if a given system needs to use different pseudo-op 173 names for these, they may be overridden in the arch specific file. */ 174 175 /* OpenBSD assembler is hacked to have .type & .size support even in a.out 176 format object files. Functions size are supported but not activated 177 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). 178 SET_ASM_OP is needed for attribute alias to work. */ 179 180 #undef TYPE_ASM_OP 181 #undef SIZE_ASM_OP 182 #undef SET_ASM_OP 183 #undef GLOBAL_ASM_OP 184 185 #define TYPE_ASM_OP "\t.type\t" 186 #define SIZE_ASM_OP "\t.size\t" 187 #define SET_ASM_OP "\t.set\t" 188 #define GLOBAL_ASM_OP "\t.globl\t" 189 190 /* The following macro defines the format used to output the second 191 operand of the .type assembler directive. */ 192 #undef TYPE_OPERAND_FMT 193 #define TYPE_OPERAND_FMT "@%s" 194 195 /* Provision if extra assembler code is needed to declare a function's result 196 (taken from svr4, not needed yet actually). */ 197 #ifndef ASM_DECLARE_RESULT 198 #define ASM_DECLARE_RESULT(FILE, RESULT) 199 #endif 200 201 /* These macros generate the special .type and .size directives which 202 are used to set the corresponding fields of the linker symbol table 203 entries under OpenBSD. These macros also have to output the starting 204 labels for the relevant functions/objects. */ 205 206 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME 207 /* Extra assembler code needed to declare a function properly. 208 Some assemblers may also need to also have something extra said 209 about the function's return value. We allow for that here. */ 210 #undef ASM_DECLARE_FUNCTION_NAME 211 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 212 do { \ 213 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ 214 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 215 ASM_OUTPUT_FUNCTION_LABEL (FILE, NAME, DECL); \ 216 } while (0) 217 #endif 218 219 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE 220 /* Declare the size of a function. */ 221 #undef ASM_DECLARE_FUNCTION_SIZE 222 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 223 do { \ 224 if (!flag_inhibit_size_directive) \ 225 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ 226 } while (0) 227 #endif 228 229 #ifndef OBSD_HAS_DECLARE_OBJECT 230 /* Extra assembler code needed to declare an object properly. */ 231 #undef ASM_DECLARE_OBJECT_NAME 232 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 233 do { \ 234 HOST_WIDE_INT size; \ 235 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 236 size_directive_output = 0; \ 237 if (!flag_inhibit_size_directive \ 238 && (DECL) && DECL_SIZE (DECL)) \ 239 { \ 240 size_directive_output = 1; \ 241 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 242 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ 243 } \ 244 ASM_OUTPUT_LABEL (FILE, NAME); \ 245 } while (0) 246 247 /* Output the size directive for a decl in rest_of_decl_compilation 248 in the case where we did not do so before the initializer. 249 Once we find the error_mark_node, we know that the value of 250 size_directive_output was set by ASM_DECLARE_OBJECT_NAME 251 when it was run for the same decl. */ 252 #undef ASM_FINISH_DECLARE_OBJECT 253 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 254 do { \ 255 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 256 HOST_WIDE_INT size; \ 257 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 258 && ! AT_END && TOP_LEVEL \ 259 && DECL_INITIAL (DECL) == error_mark_node \ 260 && !size_directive_output) \ 261 { \ 262 size_directive_output = 1; \ 263 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 264 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ 265 } \ 266 } while (0) 267 #endif 268 269 270 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need 271 to override a processor specific definition. Hence, #ifndef ASM_* 272 In case overriding turns out to be needed, one can always #undef ASM_* 273 before including this file. */ 274 275 /* Tell the assembler that a symbol is weak. */ 276 /* Note: netbsd arm32 assembler needs a .globl here. An override may 277 be needed when/if we go for arm32 support. */ 278 #ifndef ASM_WEAKEN_LABEL 279 #define ASM_WEAKEN_LABEL(FILE,NAME) \ 280 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 281 fputc ('\n', FILE); } while (0) 282 #endif 283 284 /* Storage layout. */ 285 286 287 #define HAVE_ENABLE_EXECUTE_STACK 288