1/* Base configuration file for all OpenBSD targets. 2 Copyright (C) 1999, 2000, 2004, 2005 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GCC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GCC; see the file COPYING. If not, write to 18the Free Software Foundation, 51 Franklin Street, Fifth Floor, 19Boston, MA 02110-1301, USA. */ 20 21/* Common OpenBSD configuration. 22 All OpenBSD architectures include this file, which is intended as 23 a repository for common defines. 24 25 Some defines are common to all architectures, a few of them are 26 triggered by OBSD_* guards, so that we won't override architecture 27 defaults by mistakes. 28 29 OBSD_HAS_CORRECT_SPECS: 30 another mechanism provides correct specs already. 31 OBSD_NO_DYNAMIC_LIBRARIES: 32 no implementation of dynamic libraries. 33 OBSD_OLD_GAS: 34 older flavor of gas which needs help for PIC. 35 OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE, 36 OBSD_HAS_DECLARE_OBJECT: 37 PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas 38 the corresponding logic for OBJECTS is necessarily coupled. 39 40 There are also a few `default' defines such as ASM_WEAKEN_LABEL, 41 intended as common ground for arch that don't provide 42 anything suitable. */ 43 44/* OPENBSD_NATIVE is defined only when gcc is configured as part of 45 the OpenBSD source tree, specifically through Makefile.bsd-wrapper. 46 47 In such a case the include path can be trimmed as there is no 48 distinction between system includes and gcc includes. */ 49 50/* This configuration method, namely Makefile.bsd-wrapper and 51 OPENBSD_NATIVE is NOT recommended for building cross-compilers. */ 52 53#ifdef OPENBSD_NATIVE 54 55/* The compiler is configured with ONLY the gcc/g++ standard headers. */ 56#undef INCLUDE_DEFAULTS 57#define INCLUDE_DEFAULTS \ 58 { \ 59 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \ 60 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1 }, \ 61 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1 }, \ 62 { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_COMPONENT, 0, 0 }, \ 63 { 0, 0, 0, 0 } \ 64 } 65 66/* Under OpenBSD, the normal location of the various *crt*.o files is the 67 /usr/lib directory. */ 68#undef STANDARD_STARTFILE_PREFIX 69#define STANDARD_STARTFILE_PREFIX "/usr/local/lib/" 70 71#endif 72 73 74/* Controlling the compilation driver. */ 75/* TARGET_OS_CPP_BUILTINS() common to all OpenBSD targets. */ 76#define OPENBSD_OS_CPP_BUILTINS() \ 77 do \ 78 { \ 79 builtin_define ("__OpenBSD__"); \ 80 builtin_define ("__unix__"); \ 81 builtin_define ("__ANSI_COMPAT"); \ 82 builtin_assert ("system=unix"); \ 83 builtin_assert ("system=bsd"); \ 84 builtin_assert ("system=OpenBSD"); \ 85 } \ 86 while (0) 87 88/* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread. 89 XXX the way threads are handled currently is not very satisfying, 90 since all code must be compiled with -pthread to work. 91 This two-stage defines makes it easy to pick that for targets that 92 have subspecs. */ 93#ifdef CPP_CPU_SPEC 94#define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" 95#else 96#define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}" 97#endif 98 99/* LIB_SPEC appropriate for OpenBSD. */ 100#ifdef HAS_LIBC_R 101/* -lc(_r)?(_p)?, select _r for threads, and _p for p or pg. */ 102# define OBSD_LIB_SPEC "%{!shared:-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}}" 103#else 104/* Include -lpthread if -pthread is specified on the command line. */ 105# define OBSD_LIB_SPEC "%{!shared:%{pthread:-lpthread%{p:_p}%{!p:%{pg:_p}}}} %{!shared:-lc%{p:_p}%{!p:%{pg:_p}}}" 106#endif 107 108 109#ifndef OBSD_HAS_CORRECT_SPECS 110 111#ifndef OBSD_NO_DYNAMIC_LIBRARIES 112#undef SWITCH_TAKES_ARG 113#define SWITCH_TAKES_ARG(CHAR) \ 114 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \ 115 || (CHAR) == 'R') 116#endif 117 118#undef CPP_SPEC 119#define CPP_SPEC OBSD_CPP_SPEC 120 121#ifdef OBSD_OLD_GAS 122/* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD 123 still uses a special flavor of gas that needs to be told when generating 124 pic code. */ 125#undef ASM_SPEC 126#define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}" 127#endif 128 129/* Since we use gas, stdin -> - is a good idea. */ 130#define AS_NEEDS_DASH_FOR_PIPED_INPUT 131 132/* LINK_SPEC appropriate for OpenBSD. Support for GCC options 133 -static, -assert, and -nostdlib. */ 134#undef LINK_SPEC 135#ifdef OBSD_NO_DYNAMIC_LIBRARIES 136#define LINK_SPEC \ 137 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}" 138#else 139#define LINK_SPEC \ 140 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}}} %{shared:-Bshareable -x} -dc -dp %{R*} %{static:-Bstatic} %{assert*}" 141#endif 142 143#undef LIB_SPEC 144#define LIB_SPEC OBSD_LIB_SPEC 145#endif 146 147 148/* Runtime target specification. */ 149 150/* Miscellaneous parameters. */ 151 152/* Controlling debugging info: dbx options. */ 153 154/* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that 155 use DBX don't support it. */ 156#define DBX_NO_XREFS 157 158 159/* Support of shared libraries, mostly imported from svr4.h through netbsd. */ 160/* Two differences from svr4.h: 161 - we use . - _func instead of a local label, 162 - we put extra spaces in expressions such as 163 .type _func , @function 164 This is more readable for a human being and confuses c++filt less. */ 165 166/* Assembler format: output and generation of labels. */ 167 168/* Define the strings used for the .type and .size directives. 169 These strings generally do not vary from one system running OpenBSD 170 to another, but if a given system needs to use different pseudo-op 171 names for these, they may be overridden in the arch specific file. */ 172 173/* OpenBSD assembler is hacked to have .type & .size support even in a.out 174 format object files. Functions size are supported but not activated 175 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c). 176 SET_ASM_OP is needed for attribute alias to work. */ 177 178#undef TYPE_ASM_OP 179#undef SIZE_ASM_OP 180#undef SET_ASM_OP 181#undef GLOBAL_ASM_OP 182 183#define TYPE_ASM_OP "\t.type\t" 184#define SIZE_ASM_OP "\t.size\t" 185#define SET_ASM_OP "\t.set\t" 186#define GLOBAL_ASM_OP "\t.globl\t" 187 188/* The following macro defines the format used to output the second 189 operand of the .type assembler directive. */ 190#undef TYPE_OPERAND_FMT 191#define TYPE_OPERAND_FMT "@%s" 192 193/* Provision if extra assembler code is needed to declare a function's result 194 (taken from svr4, not needed yet actually). */ 195#ifndef ASM_DECLARE_RESULT 196#define ASM_DECLARE_RESULT(FILE, RESULT) 197#endif 198 199/* These macros generate the special .type and .size directives which 200 are used to set the corresponding fields of the linker symbol table 201 entries under OpenBSD. These macros also have to output the starting 202 labels for the relevant functions/objects. */ 203 204#ifndef OBSD_HAS_DECLARE_FUNCTION_NAME 205/* Extra assembler code needed to declare a function properly. 206 Some assemblers may also need to also have something extra said 207 about the function's return value. We allow for that here. */ 208#undef ASM_DECLARE_FUNCTION_NAME 209#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 210 do { \ 211 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \ 212 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 213 ASM_OUTPUT_LABEL(FILE, NAME); \ 214 } while (0) 215#endif 216 217#ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE 218/* Declare the size of a function. */ 219#undef ASM_DECLARE_FUNCTION_SIZE 220#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 221 do { \ 222 if (!flag_inhibit_size_directive) \ 223 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \ 224 } while (0) 225#endif 226 227#ifndef OBSD_HAS_DECLARE_OBJECT 228/* Extra assembler code needed to declare an object properly. */ 229#undef ASM_DECLARE_OBJECT_NAME 230#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 231 do { \ 232 HOST_WIDE_INT size; \ 233 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ 234 size_directive_output = 0; \ 235 if (!flag_inhibit_size_directive \ 236 && (DECL) && DECL_SIZE (DECL)) \ 237 { \ 238 size_directive_output = 1; \ 239 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 240 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ 241 } \ 242 ASM_OUTPUT_LABEL (FILE, NAME); \ 243 } while (0) 244 245/* Output the size directive for a decl in rest_of_decl_compilation 246 in the case where we did not do so before the initializer. 247 Once we find the error_mark_node, we know that the value of 248 size_directive_output was set by ASM_DECLARE_OBJECT_NAME 249 when it was run for the same decl. */ 250#undef ASM_FINISH_DECLARE_OBJECT 251#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 252do { \ 253 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 254 HOST_WIDE_INT size; \ 255 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 256 && ! AT_END && TOP_LEVEL \ 257 && DECL_INITIAL (DECL) == error_mark_node \ 258 && !size_directive_output) \ 259 { \ 260 size_directive_output = 1; \ 261 size = int_size_in_bytes (TREE_TYPE (DECL)); \ 262 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ 263 } \ 264 } while (0) 265#endif 266 267 268/* Those are `generic' ways to weaken/globalize a label. We shouldn't need 269 to override a processor specific definition. Hence, #ifndef ASM_* 270 In case overriding turns out to be needed, one can always #undef ASM_* 271 before including this file. */ 272 273/* Tell the assembler that a symbol is weak. */ 274/* Note: netbsd arm32 assembler needs a .globl here. An override may 275 be needed when/if we go for arm32 support. */ 276#ifndef ASM_WEAKEN_LABEL 277#define ASM_WEAKEN_LABEL(FILE,NAME) \ 278 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 279 fputc ('\n', FILE); } while (0) 280#endif 281 282/* Storage layout. */ 283 284 285/* Otherwise, since we support weak, gthr.h erroneously tries to use 286 #pragma weak. */ 287#define GTHREAD_USE_WEAK 0 288 289/* bug work around: we don't want to support #pragma weak, but the current 290 code layout needs HANDLE_PRAGMA_WEAK asserted for __attribute((weak)) to 291 work. On the other hand, we don't define HANDLE_PRAGMA_WEAK directly, 292 as this depends on a few other details as well... */ 293#define HANDLE_SYSV_PRAGMA 1 294 295/* Stack is explicitly denied execution rights on OpenBSD platforms. */ 296#define ENABLE_EXECUTE_STACK \ 297extern void __enable_execute_stack (void *); \ 298void \ 299__enable_execute_stack (void *addr) \ 300{ \ 301 long size = getpagesize (); \ 302 long mask = ~(size-1); \ 303 char *page = (char *) (((long) addr) & mask); \ 304 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \ 305 \ 306 if (mprotect (page, end - page, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) \ 307 perror ("mprotect of trampoline code"); \ 308} 309 310#include <sys/types.h> 311#include <sys/mman.h> 312