freebsd.h revision 76601
1/* Base configuration file for all FreeBSD targets. 2 Copyright (C) 1999, 2000 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC 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 11GNU CC 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 GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21/* Common FreeBSD configuration. 22 All FreeBSD architectures should include this file, which will specify 23 their commonalities. 24 Adapted from /usr/src/contrib/gcc/config/i386/freebsd.h, 25 /usr/src/contrib/gcc/config/svr4.h & 26 egcs/gcc/config/i386/freebsd-elf.h by 27 David O'Brien <obrien@FreeBSD.org>. */ 28 29/* $FreeBSD: head/contrib/gcc/config/freebsd.h 76601 2001-05-14 22:45:26Z obrien $ */ 30 31 32/* Cpp, assembler, linker, library, and startfile spec's. */ 33 34/* This defines which switch letters take arguments. On FreeBSD, most of 35 the normal cases (defined in gcc.c) apply, and we also have -h* and 36 -z* options (for the linker) (coming from SVR4). 37 We also have -R (alias --rpath), no -z, --soname (-h), --assert etc. */ 38 39#define FBSD_SWITCH_TAKES_ARG(CHAR) \ 40 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \ 41 || (CHAR) == 'h' \ 42 || (CHAR) == 'z' /* ignored by ld */ \ 43 || (CHAR) == 'R') 44 45#undef SWITCH_TAKES_ARG 46#define SWITCH_TAKES_ARG(CHAR) (FBSD_SWITCH_TAKES_ARG(CHAR)) 47 48/* This defines which multi-letter switches take arguments. */ 49 50#define FBSD_WORD_SWITCH_TAKES_ARG(STR) \ 51 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \ 52 || !strcmp ((STR), "rpath") || !strcmp ((STR), "rpath-link") \ 53 || !strcmp ((STR), "soname") || !strcmp ((STR), "defsym") \ 54 || !strcmp ((STR), "assert") || !strcmp ((STR), "dynamic-linker")) 55 56#undef WORD_SWITCH_TAKES_ARG 57#define WORD_SWITCH_TAKES_ARG(STR) (FBSD_WORD_SWITCH_TAKES_ARG(STR)) 58 59/* Place spaces around this string. We depend on string splicing to produce 60 the final CPP_PREDEFINES value. */ 61 62#define FBSD_CPP_PREDEFINES \ 63 " -D__FreeBSD__=5 -D__FreeBSD_cc_version=500002 -Dunix -Asystem(unix) -Asystem(FreeBSD) " 64 65#define FBSD_CPP_SPEC " \ 66 %(cpp_cpu) \ 67 %{!maout: -D__ELF__} \ 68 %{munderscores: -D__UNDERSCORES__} \ 69 %{maout: %{!mno-underscores: -D__UNDERSCORES__}} \ 70 %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__} \ 71 %{posix:-D_POSIX_SOURCE}" 72 73#undef CPP_SPEC 74#define CPP_SPEC FBSD_CPP_SPEC 75 76/* Provide a LIB_SPEC appropriate for FreeBSD. Before 77 __FreeBSD_version 500016, select the appropriate libc, depending on 78 whether we're doing profiling or need threads support. (similar to 79 the default, except no -lg, and no -p). At __FreeBSD_version 80 500016 and later, when threads support is requested include both 81 -lc and -lc_r instead of only -lc_r. */ 82 83#undef LIB_SPEC 84#include <sys/param.h> 85#if __FreeBSD_version >= 500016 86#define LIB_SPEC " \ 87 %{!shared: \ 88 %{!pg: %{pthread:-lc_r} -lc} \ 89 %{pg: %{pthread:-lc_r_p} -lc_p} \ 90 }" 91#else 92#define LIB_SPEC " \ 93 %{!shared: \ 94 %{!pg: \ 95 %{!pthread:-lc} \ 96 %{pthread:-lc_r}} \ 97 %{pg: \ 98 %{!pthread:-lc_p} \ 99 %{pthread:-lc_r_p}} \ 100 }" 101#endif 102 103 104/************************[ Target stuff ]***********************************/ 105 106/* All FreeBSD Architectures support the ELF object file format. */ 107#undef OBJECT_FORMAT_ELF 108#define OBJECT_FORMAT_ELF 109 110/* Don't assume anything about the header files. */ 111#undef NO_IMPLICIT_EXTERN_C 112#define NO_IMPLICIT_EXTERN_C 113 114/* Implicit library calls should use memcpy, not bcopy, etc. */ 115#undef TARGET_MEM_FUNCTIONS 116#define TARGET_MEM_FUNCTIONS 117 118/* Allow #sccs in preprocessor. */ 119#undef SCCS_DIRECTIVE 120#define SCCS_DIRECTIVE 121 122#undef HAVE_ATEXIT 123#define HAVE_ATEXIT 124 125/* Code generation parameters. */ 126 127/* Don't default to pcc-struct-return, because gcc is the only compiler, and 128 we want to retain compatibility with older gcc versions 129 (even though the SVR4 ABI for the i386 says that records and unions are 130 returned in memory). */ 131#undef DEFAULT_PCC_STRUCT_RETURN 132#define DEFAULT_PCC_STRUCT_RETURN 0 133 134/* Writing `int' for a bitfield forces int alignment for the structure. */ 135/* XXX: ok for Alpha?? */ 136#undef PCC_BITFIELD_TYPE_MATTERS 137#define PCC_BITFIELD_TYPE_MATTERS 1 138 139/* Use periods rather than dollar signs in special g++ assembler names. 140 This ensures the configuration knows our system correctly so we can link 141 with libraries compiled with the native cc. */ 142#undef NO_DOLLAR_IN_LABEL 143 144/* The prefix to add to user-visible assembler symbols. 145 For System V Release 4 & ELF the convention is *not* to prepend a leading 146 underscore onto user-level symbol names. */ 147 148#undef USER_LABEL_PREFIX 149#define USER_LABEL_PREFIX "" 150 151/* Handle #pragma weak and #pragma pack. */ 152#undef HANDLE_SYSV_PRAGMA 153#define HANDLE_SYSV_PRAGMA 154 155#ifdef WANT_DWARF2_UNWIND 156/* FreeBSD ELF uses across the board will now use DWARF2 unwinding as the IA-64 157 psABI requires it. */ 158#define DWARF2_UNWIND_INFO 1 159#else 160/* Maintain compatibility with the FreeBSD {3,4}.x C++ ABI. */ 161#define DWARF2_UNWIND_INFO 0 162#endif 163 164/* Do not use ``thunks'' to implement C++ vtables. This method still has 165 fatal bugs. Also, GCC 3.0 will have a new C++ ABI that may not even 166 support `thunks'. */ 167#undef DEFAULT_VTABLE_THUNKS 168 169 170/************************[ Assembler stuff ]********************************/ 171 172/* Override the default comment-starter of "/". */ 173#undef ASM_COMMENT_START 174#define ASM_COMMENT_START "#" 175 176/* Attach a special .ident directive to the end of the file to identify 177 the version of GCC which compiled this code. The format of the .ident 178 string is patterned after the ones produced by native SVR4 C compilers. */ 179 180#undef IDENT_ASM_OP 181#define IDENT_ASM_OP "\t.ident\t" 182 183/* Output #ident as a .ident. */ 184 185#undef ASM_OUTPUT_IDENT 186#define ASM_OUTPUT_IDENT(FILE, NAME) \ 187 fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME)); 188 189/* Identify the front-end which produced this file. To keep symbol 190 space down, and not confuse kdb, only do this if the language is 191 not C. (svr4.h defines ASM_IDENTIFY_GCC but neglects this) */ 192 193#undef ASM_IDENTIFY_LANGUAGE 194#define ASM_IDENTIFY_LANGUAGE(FILE) \ 195 { \ 196 if (strcmp (lang_identify (), "c") != 0) \ 197 output_lang_identify (FILE); \ 198 } 199 200#undef ASM_FILE_END 201#define ASM_FILE_END(FILE) \ 202 do { \ 203 if (!flag_no_ident) \ 204 fprintf ((FILE), "%s\"[ASM_FILE_END]GCC: (%s) %s\"\n", \ 205 IDENT_ASM_OP, lang_identify(), version_string); \ 206 } while (0) 207 208/* This is the pseudo-op used to generate a contiguous sequence of byte 209 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL 210 AUTOMATICALLY APPENDED. This is the same for most SVR4 assemblers. */ 211 212#undef ASCII_DATA_ASM_OP 213#define ASCII_DATA_ASM_OP "\t.ascii\t" 214 215#undef ASM_BYTE_OP 216#define ASM_BYTE_OP "\t.byte\t" 217 218/* This is how to allocate empty space in some section. The .zero 219 pseudo-op is used for this on most ELF assemblers. */ 220 221#undef SKIP_ASM_OP 222#define SKIP_ASM_OP "\t.zero\t" 223 224/* A table of bytes codes used by the ASM_OUTPUT_ASCII and 225 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table 226 corresponds to a particular byte value [0..255]. For any 227 given byte value, if the value in the corresponding table 228 position is zero, the given character can be output directly. 229 If the table value is 1, the byte must be output as a \ooo 230 octal escape. If the tables value is anything else, then the 231 byte value should be output as a \ followed by the value 232 in the table. Note that we can use standard UN*X escape 233 sequences for many control characters, but we don't use 234 \a to represent BEL because some SVR4 assemblers (e.g. on 235 the i386) don't know about that. Also, we don't use \v 236 since some versions of gas, such as 2.2 did not accept it. */ 237 238#define ESCAPES \ 239"\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ 240\0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\ 241\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\ 242\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\ 243\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ 244\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ 245\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\ 246\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1" 247 248/* Some SVR4 assemblers have a limit on the number of characters which 249 can appear in the operand of a .string directive. If your assembler 250 has such a limitation, you should define STRING_LIMIT to reflect that 251 limit. Note that at least some SVR4 assemblers have a limit on the 252 actual number of bytes in the double-quoted string, and that they 253 count each character in an escape sequence as one byte. Thus, an 254 escape sequence like \377 would count as four bytes. 255 256 If your target assembler doesn't support the .string directive, you 257 should define this to zero. 258*/ 259 260#undef STRING_LIMIT 261#define STRING_LIMIT ((unsigned) 256) 262 263#undef STRING_ASM_OP 264#define STRING_ASM_OP "\t.string\t" 265 266/* Output the label which precedes a jumptable. Note that for all svr4/ELF 267 systems where we actually generate jumptables (which is to say every 268 SVR4 target except i386, where we use casesi instead) we put the jump- 269 tables into the .rodata section and since other stuff could have been 270 put into the .rodata section prior to any given jumptable, we have to 271 make sure that the location counter for the .rodata section gets pro- 272 perly re-aligned prior to the actual beginning of the jump table. */ 273 274#undef ALIGN_ASM_OP 275#define ALIGN_ASM_OP "\t.align\t" 276 277/* This says how to output assembler code to declare an 278 uninitialized external linkage data object. Under SVR4/ELF, 279 the linker seems to want the alignment of data objects 280 to depend on their types. We do exactly that here. */ 281 282#undef COMMON_ASM_OP 283#define COMMON_ASM_OP "\t.comm\t" 284 285/* This says how to output assembler code to declare an 286 uninitialized internal linkage data object. Under SVR4/ELF, 287 the linker seems to want the alignment of data objects 288 to depend on their types. We do exactly that here. */ 289 290#undef LOCAL_ASM_OP 291#define LOCAL_ASM_OP "\t.local\t" 292 293#undef ASM_OUTPUT_BEFORE_CASE_LABEL 294#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \ 295 ASM_OUTPUT_ALIGN ((FILE), 2); 296 297#undef ASM_OUTPUT_CASE_LABEL 298#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \ 299 do { \ 300 ASM_OUTPUT_BEFORE_CASE_LABEL ((FILE), (PREFIX), (NUM), (JUMPTABLE)) \ 301 ASM_OUTPUT_INTERNAL_LABEL ((FILE), (PREFIX), (NUM)); \ 302 } while (0) 303 304/* The standard SVR4/ELF assembler seems to require that certain builtin 305 library routines (e.g. .udiv) be explicitly declared as .globl 306 in each assembly file where they are referenced. */ 307 308#undef ASM_OUTPUT_EXTERNAL_LIBCALL 309#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ 310 ASM_GLOBALIZE_LABEL ((FILE), XSTR ((FUN), 0)) 311 312/* Support const sections and the ctors and dtors sections for g++. 313 Note that there appears to be two different ways to support const 314 sections at the moment. You can either #define the symbol 315 READONLY_DATA_SECTION (giving it some code which switches to the 316 readonly data section) or else you can #define the symbols 317 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and 318 SELECT_RTX_SECTION. We do both here just to be on the safe side. 319 FreeBSD conditionalizes the use of ".section rodata" depending on 320 ELF mode - otherwise .text. */ 321 322#undef USE_CONST_SECTION 323#define USE_CONST_SECTION TARGET_ELF 324 325#undef CONST_SECTION_ASM_OP 326#define CONST_SECTION_ASM_OP "\t.section\t.rodata" 327 328/* Define the pseudo-ops used to switch to the .ctors and .dtors sections. 329 330 Note that we want to give these sections the SHF_WRITE attribute 331 because these sections will actually contain data (i.e. tables of 332 addresses of functions in the current root executable or shared library 333 file) and, in the case of a shared library, the relocatable addresses 334 will have to be properly resolved/relocated (and then written into) by 335 the dynamic linker when it actually attaches the given shared library 336 to the executing process. (Note that on SVR4, you may wish to use the 337 `-z text' option to the ELF linker, when building a shared library, as 338 an additional check that you are doing everything right. But if you do 339 use the `-z text' option when building a shared library, you will get 340 errors unless the .ctors and .dtors sections are marked as writable 341 via the SHF_WRITE attribute.) */ 342 343#undef CTORS_SECTION_ASM_OP 344#define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\"" 345#undef DTORS_SECTION_ASM_OP 346#define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\"" 347 348/* On SVR4, we *do* have support for the .init and .fini sections, and we 349 can put stuff in there to be executed before and after `main'. We let 350 crtstuff.c and other files know this by defining the following symbols. 351 The definitions say how to change sections to the .init and .fini 352 sections. This is the same for all known SVR4 assemblers. */ 353 354#undef INIT_SECTION_ASM_OP 355#define INIT_SECTION_ASM_OP "\t.section\t.init" 356#undef FINI_SECTION_ASM_OP 357#define FINI_SECTION_ASM_OP "\t.section\t.fini" 358 359/* A default list of other sections which we might be "in" at any given 360 time. For targets that use additional sections (e.g. .tdesc) you 361 should override this definition in the target-specific file which 362 includes this file. */ 363 364#undef EXTRA_SECTIONS 365#define EXTRA_SECTIONS in_const, in_ctors, in_dtors 366 367/* A default list of extra section function definitions. For targets 368 that use additional sections (e.g. .tdesc) you should override this 369 definition in the target-specific file which includes this file. */ 370 371#undef EXTRA_SECTION_FUNCTIONS 372#define EXTRA_SECTION_FUNCTIONS \ 373 CONST_SECTION_FUNCTION \ 374 CTORS_SECTION_FUNCTION \ 375 DTORS_SECTION_FUNCTION 376 377#undef READONLY_DATA_SECTION 378#define READONLY_DATA_SECTION() const_section () 379 380extern void text_section (); 381 382#undef CONST_SECTION_FUNCTION 383#define CONST_SECTION_FUNCTION \ 384 void \ 385 const_section () \ 386 { \ 387 if (!USE_CONST_SECTION) \ 388 text_section(); \ 389 else if (in_section != in_const) \ 390 { \ 391 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \ 392 in_section = in_const; \ 393 } \ 394 } 395 396#undef CTORS_SECTION_FUNCTION 397#define CTORS_SECTION_FUNCTION \ 398 void \ 399 ctors_section () \ 400 { \ 401 if (in_section != in_ctors) \ 402 { \ 403 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ 404 in_section = in_ctors; \ 405 } \ 406 } 407 408#undef DTORS_SECTION_FUNCTION 409#define DTORS_SECTION_FUNCTION \ 410 void \ 411 dtors_section () \ 412 { \ 413 if (in_section != in_dtors) \ 414 { \ 415 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ 416 in_section = in_dtors; \ 417 } \ 418 } 419 420/* A C statement or statements to switch to the appropriate 421 section for output of RTX in mode MODE. RTX is some kind 422 of constant in RTL. The argument MODE is redundant except 423 in the case of a `const_int' rtx. Currently, these always 424 go into the const section. */ 425 426#undef SELECT_RTX_SECTION 427#define SELECT_RTX_SECTION(MODE, RTX) const_section() 428 429/* Define the strings used for the special svr4/ELF .type and .size 430 directives. These strings generally do not vary from one svr4/ELF 431 system to another. */ 432 433#undef TYPE_ASM_OP 434#define TYPE_ASM_OP "\t.type\t" 435#undef SIZE_ASM_OP 436#define SIZE_ASM_OP "\t.size\t" 437 438/* This is how we tell the assembler that a symbol is weak. */ 439 440#undef ASM_WEAKEN_LABEL 441#define ASM_WEAKEN_LABEL(FILE, NAME) \ 442 do { \ 443 fputs ("\t.globl\t", (FILE)); assemble_name ((FILE), (NAME)); \ 444 fputc ('\n', (FILE)); \ 445 fputs ("\t.weak\t", (FILE)); assemble_name ((FILE), (NAME)); \ 446 fputc ('\n', (FILE)); \ 447 } while (0) 448 449/* The following macro defines the [default] format used with ELF to output 450 the second operand of the .type assembler directive. */ 451 452#undef TYPE_OPERAND_FMT 453#define TYPE_OPERAND_FMT "@%s" 454 455/* Write the extra assembler code needed to declare a function's result. 456 Most svr4/ELF assemblers don't require any special declaration of the 457 result value. */ 458 459#undef ASM_DECLARE_RESULT 460#define ASM_DECLARE_RESULT(FILE, RESULT) 461 462/* These macros generate the special .type and .size directives which 463 are used to set the corresponding fields of the linker symbol table 464 entries in an ELF object file under SVR4/ELF. These macros also output 465 the starting labels for the relevant functions/objects. */ 466 467/* Write the extra assembler code needed to declare an object properly. */ 468 469#undef ASM_DECLARE_OBJECT_NAME 470#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 471 do { \ 472 fprintf (FILE, "%s ", TYPE_ASM_OP); \ 473 assemble_name (FILE, NAME); \ 474 putc (',', FILE); \ 475 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \ 476 putc ('\n', FILE); \ 477 size_directive_output = 0; \ 478 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \ 479 { \ 480 size_directive_output = 1; \ 481 fprintf (FILE, "%s ", SIZE_ASM_OP); \ 482 assemble_name (FILE, NAME); \ 483 putc (',', FILE); \ 484 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ 485 int_size_in_bytes (TREE_TYPE (DECL))); \ 486 fputc ('\n', FILE); \ 487 } \ 488 ASM_OUTPUT_LABEL(FILE, NAME); \ 489 } while (0) 490 491/* Output the size directive for a decl in rest_of_decl_compilation 492 in the case where we did not do so before the initializer. 493 Once we find the error_mark_node, we know that the value of 494 size_directive_output was set 495 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ 496 497#undef ASM_FINISH_DECLARE_OBJECT 498#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 499 do { \ 500 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 501 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 502 && ! AT_END && TOP_LEVEL \ 503 && DECL_INITIAL (DECL) == error_mark_node \ 504 && !size_directive_output) \ 505 { \ 506 size_directive_output = 1; \ 507 fprintf (FILE, "%s ", SIZE_ASM_OP); \ 508 assemble_name (FILE, name); \ 509 putc (',', FILE); \ 510 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ 511 int_size_in_bytes (TREE_TYPE (DECL))); \ 512 fputc ('\n', FILE); \ 513 } \ 514 } while (0) 515 516 517/************************[ Debugger stuff ]*********************************/ 518 519/* All ELF targets can support DWARF-2. */ 520#undef DWARF2_DEBUGGING_INFO 521#define DWARF2_DEBUGGING_INFO 522 523/* This is BSD, so we want the DBX format. */ 524#undef DBX_DEBUGGING_INFO 525#define DBX_DEBUGGING_INFO 526 527/* This is BSD, so use stabs instead of DWARF debug format. */ 528#undef PREFERRED_DEBUGGING_TYPE 529#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG 530 531/* But allow STABS to be supported as well. 532 Note that we want to override some definition settings done for some 533 architecture's native OS's tools that don't apply to us. */ 534#undef ASM_IDENTIFY_GCC 535#undef ASM_IDENTIFY_LANGUAGE 536