1 /* Base configuration file for all OpenBSD targets. 2 Copyright (C) 1999, 2000, 2004, 2005, 2007 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 { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_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 #ifndef OBSD_NO_DYNAMIC_LIBRARIES 122 #undef SWITCH_TAKES_ARG 123 #define SWITCH_TAKES_ARG(CHAR) \ 124 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \ 125 || (CHAR) == 'R') 126 #endif 127 128 #undef CPP_SPEC 129 #define CPP_SPEC OBSD_CPP_SPEC 130 131 #ifdef OBSD_OLD_GAS 132 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD 133 still uses a special flavor of gas that needs to be told when generating 134 pic code. */ 135 #undef ASM_SPEC 136 #define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}" 137 #endif 138 139 /* Since we use gas, stdin -> - is a good idea. */ 140 #define AS_NEEDS_DASH_FOR_PIPED_INPUT 141 142 #undef LIB_SPEC 143 #define LIB_SPEC OBSD_LIB_SPEC 144 145 #if defined(HAVE_LD_EH_FRAME_HDR) 146 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} " 147 #endif 148 149 #undef LIB_SPEC 150 #define LIB_SPEC OBSD_LIB_SPEC 151 #endif 152 153 154 /* 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 163 164 165 /* Support of shared libraries, mostly imported from svr4.h through netbsd. */ 166 /* Two differences from svr4.h: 167 - we use . - _func instead of a local label, 168 - we put extra spaces in expressions such as 169 .type _func , @function 170 This is more readable for a human being and confuses c++filt less. */ 171 172 /* Assembler format: output and generation of labels. */ 173 174 /* Define the strings used for the .type and .size directives. 175 These strings generally do not vary from one system running OpenBSD 176 to another, but if a given system needs to use different pseudo-op 177 names for these, they may be overridden in the arch specific file. */ 178 179 /* OpenBSD assembler is hacked to have .type & .size support even in a.out 180 format object files. Functions size are supported but not activated 181 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). 182 SET_ASM_OP is needed for attribute alias to work. */ 183 184 #undef TYPE_ASM_OP 185 #undef SIZE_ASM_OP 186 #undef SET_ASM_OP 187 #undef GLOBAL_ASM_OP 188 189 #define TYPE_ASM_OP "\t.type\t" 190 #define SIZE_ASM_OP "\t.size\t" 191 #define SET_ASM_OP "\t.set\t" 192 #define GLOBAL_ASM_OP "\t.globl\t" 193 194 /* The following macro defines the format used to output the second 195 operand of the .type assembler directive. */ 196 #undef TYPE_OPERAND_FMT 197 #define TYPE_OPERAND_FMT "@%s" 198 199 /* Provision if extra assembler code is needed to declare a function's result 200 (taken from svr4, not needed yet actually). */ 201 #ifndef ASM_DECLARE_RESULT 202 #define ASM_DECLARE_RESULT(FILE, RESULT) 203 #endif 204 205 /* These macros generate the special .type and .size directives which 206 are used to set the corresponding fields of the linker symbol table 207 entries under OpenBSD. These macros also have to output the starting 208 labels for the relevant functions/objects. */ 209 210 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME 211 /* Extra assembler code needed to declare a function properly. 212 Some assemblers may also need to also have something extra said 213 about the function's return value. We allow for that here. */ 214 #undef ASM_DECLARE_FUNCTION_NAME 215 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 216 do { \ 217 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ 218 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 219 ASM_OUTPUT_LABEL(FILE, NAME); \ 220 } while (0) 221 #endif 222 223 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE 224 /* Declare the size of a function. */ 225 #undef ASM_DECLARE_FUNCTION_SIZE 226 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 227 do { \ 228 if (!flag_inhibit_size_directive) \ 229 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ 230 } while (0) 231 #endif 232 233 #ifndef OBSD_HAS_DECLARE_OBJECT 234 /* Extra assembler code needed to declare an object properly. */ 235 #undef ASM_DECLARE_OBJECT_NAME 236 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 237 do { \ 238 HOST_WIDE_INT size; \ 239 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 240 size_directive_output = 0; \ 241 if (!flag_inhibit_size_directive \ 242 && (DECL) && DECL_SIZE (DECL)) \ 243 { \ 244 size_directive_output = 1; \ 245 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 246 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ 247 } \ 248 ASM_OUTPUT_LABEL (FILE, NAME); \ 249 } while (0) 250 251 /* Output the size directive for a decl in rest_of_decl_compilation 252 in the case where we did not do so before the initializer. 253 Once we find the error_mark_node, we know that the value of 254 size_directive_output was set by ASM_DECLARE_OBJECT_NAME 255 when it was run for the same decl. */ 256 #undef ASM_FINISH_DECLARE_OBJECT 257 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 258 do { \ 259 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 260 HOST_WIDE_INT size; \ 261 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 262 && ! AT_END && TOP_LEVEL \ 263 && DECL_INITIAL (DECL) == error_mark_node \ 264 && !size_directive_output) \ 265 { \ 266 size_directive_output = 1; \ 267 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 268 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ 269 } \ 270 } while (0) 271 #endif 272 273 274 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need 275 to override a processor specific definition. Hence, #ifndef ASM_* 276 In case overriding turns out to be needed, one can always #undef ASM_* 277 before including this file. */ 278 279 /* Tell the assembler that a symbol is weak. */ 280 /* Note: netbsd arm32 assembler needs a .globl here. An override may 281 be needed when/if we go for arm32 support. */ 282 #ifndef ASM_WEAKEN_LABEL 283 #define ASM_WEAKEN_LABEL(FILE,NAME) \ 284 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 285 fputc ('\n', FILE); } while (0) 286 #endif 287 288 /* Storage layout. */ 289 290 291 /* bug work around: we don't want to support #pragma weak, but the current 292 code layout needs HANDLE_PRAGMA_WEAK asserted for __attribute((weak)) to 293 work. On the other hand, we don't define HANDLE_PRAGMA_WEAK directly, 294 as this depends on a few other details as well... */ 295 #define HANDLE_SYSV_PRAGMA 1 296 297 /* Stack is explicitly denied execution rights on OpenBSD platforms. */ 298 #define ENABLE_EXECUTE_STACK \ 299 extern void __enable_execute_stack (void *); \ 300 void \ 301 __enable_execute_stack (void *addr) \ 302 { \ 303 long size = getpagesize (); \ 304 long mask = ~(size-1); \ 305 char *page = (char *) (((long) addr) & mask); \ 306 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \ 307 \ 308 if (mprotect (page, end - page, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) \ 309 perror ("mprotect of trampoline code"); \ 310 } 311 312 #include <sys/types.h> 313 #include <sys/mman.h> 314