freebsd.h revision 97910
1/* Definitions for Intel 386 running FreeBSD with either a.out or ELF format 2 Copyright (C) 1996, 2000, 2002 Free Software Foundation, Inc. 3 Contributed by Eric Youngdale. 4 Modified for stabs-in-ELF by H.J. Lu. 5 Adapted from GNU/Linux version by John Polstra. 6 Added support for generating "old a.out gas" on the fly by Peter Wemm. 7 Continued development by David O'Brien <obrien@freebsd.org> 8 9This file is part of GNU CC. 10 11GNU CC is free software; you can redistribute it and/or modify 12it under the terms of the GNU General Public License as published by 13the Free Software Foundation; either version 2, or (at your option) 14any later version. 15 16GNU CC is distributed in the hope that it will be useful, 17but WITHOUT ANY WARRANTY; without even the implied warranty of 18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19GNU General Public License for more details. 20 21You should have received a copy of the GNU General Public License 22along with GNU CC; see the file COPYING. If not, write to 23the Free Software Foundation, 59 Temple Place - Suite 330, 24Boston, MA 02111-1307, USA. */ 25 26/* $FreeBSD: head/contrib/gcc/config/i386/freebsd.h 97910 2002-06-06 03:30:40Z obrien $ */ 27 28#undef TARGET_VERSION 29#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 30 31#undef CC1_SPEC 32#define CC1_SPEC "%(cc1_cpu) %{profile:-p} \ 33 %{gline:%{!g:%{!g0:%{!g1:%{!g2: -g1}}}}} \ 34 %{maout: %{!mno-underscores: %{!munderscores: -munderscores }}}" 35 36#undef ASM_SPEC 37#define ASM_SPEC "%{v*: -v} %{maout: %{fpic:-k} %{fPIC:-k}}" 38 39#undef ASM_FINAL_SPEC 40#define ASM_FINAL_SPEC "%|" 41 42/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 43 for the special GCC options -static and -shared, which allow us to 44 link things in one of these three modes by applying the appropriate 45 combinations of options at link-time. We like to support here for 46 as many of the other GNU linker options as possible. But I don't 47 have the time to search for those flags. I am sure how to add 48 support for -soname shared_object_name. H.J. 49 50 When the -shared link option is used a final link is not being 51 done. */ 52 53#undef LINK_SPEC 54#define LINK_SPEC "\ 55 %{p:%e`-p' not supported; use `-pg' and gprof(1)} \ 56 %{maout: %{shared:-Bshareable} \ 57 %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \ 58 %{pg:-Bstatic} %{Z}} \ 59 %{assert*} %{R*}} \ 60 %{!maout: \ 61 %{Wl,*:%*} \ 62 %{v:-V} \ 63 %{assert*} %{R*} %{rpath*} %{defsym*} \ 64 %{shared:-Bshareable %{h*} %{soname*}} \ 65 %{!shared: \ 66 %{!static: \ 67 %{rdynamic: -export-dynamic} \ 68 %{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \ 69 %{static:-Bstatic}} \ 70 %{symbolic:-Bsymbolic}}" 71 72/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add the magical 73 crtbegin.o file (see crtstuff.c) which provides part of the support for 74 getting C++ file-scope static object constructed before entering `main'. */ 75 76#undef STARTFILE_SPEC 77#define STARTFILE_SPEC "\ 78 %{maout: %{shared:c++rt0.o%s} \ 79 %{!shared: \ 80 %{pg:gcrt0.o%s}%{!pg: \ 81 %{static:scrt0.o%s} \ 82 %{!static:crt0.o%s}}}} \ 83 %{!maout: \ 84 %{!shared: \ 85 %{pg:gcrt1.o%s} \ 86 %{!pg: \ 87 %{p:gcrt1.o%s} \ 88 %{!p:crt1.o%s}}} \ 89 crti.o%s \ 90 %{!shared:crtbegin.o%s} \ 91 %{shared:crtbeginS.o%s}}" 92 93/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our 94 own magical crtend.o file (see crtstuff.c) which provides part of the 95 support for getting C++ file-scope static object constructed before 96 entering `main', followed by the normal "finalizer" file, `crtn.o'. */ 97 98#undef ENDFILE_SPEC 99#define ENDFILE_SPEC "\ 100 %{!maout: \ 101 %{!shared:crtend.o%s} \ 102 %{shared:crtendS.o%s} crtn.o%s}" 103 104/* FreeBSD conditionalizes the use of ".section rodata" depending on 105 ELF mode - otherwise .text. */ 106#undef USE_CONST_SECTION 107#define USE_CONST_SECTION TARGET_ELF 108 109/* ".string" doesn't work for the aout case. */ 110#undef STRING_ASM_OP 111#define STRING_ASM_OP (TARGET_AOUT ? "\t.asciz\t" : "\t.string\t") 112 113 114/************************[ Target stuff ]***********************************/ 115 116/* Define the actual types of some ANSI-mandated types. 117 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 118 c-common.c, and config/<arch>/<arch>.h. */ 119 120#undef SIZE_TYPE 121#define SIZE_TYPE "unsigned int" 122 123#undef PTRDIFF_TYPE 124#define PTRDIFF_TYPE "int" 125 126#undef WCHAR_TYPE_SIZE 127#define WCHAR_TYPE_SIZE BITS_PER_WORD 128 129#undef TARGET_VERSION 130#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 131 132#define MASK_PROFILER_EPILOGUE 010000000000 133#define MASK_AOUT 004000000000 /* a.out not elf */ 134#define MASK_UNDERSCORES 002000000000 /* use leading _ */ 135 136#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 137#define TARGET_AOUT (target_flags & MASK_AOUT) 138#define TARGET_ELF ((target_flags & MASK_AOUT) == 0) 139#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0) 140 141#undef SUBTARGET_SWITCHES 142#define SUBTARGET_SWITCHES \ 143 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 144 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \ 145 { "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \ 146 { "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \ 147 { "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \ 148 { "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"}, 149 150/* This goes away when the math emulator is fixed. */ 151#undef TARGET_SUBTARGET_DEFAULT 152#define TARGET_SUBTARGET_DEFAULT \ 153 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 154 155/* Don't default to pcc-struct-return, we want to retain compatibility with 156 older gcc versions AND pcc-struct-return is nonreentrant. 157 (even though the SVR4 ABI for the i386 says that records and unions are 158 returned in memory). */ 159 160#undef DEFAULT_PCC_STRUCT_RETURN 161#define DEFAULT_PCC_STRUCT_RETURN 0 162 163/* The a.out tools do not support "linkonce" sections. */ 164#undef SUPPORTS_ONE_ONLY 165#define SUPPORTS_ONE_ONLY TARGET_ELF 166 167/* Prefix for internally generated assembler labels. If we aren't using 168 underscores, we are using prefix `.'s to identify labels that should 169 be ignored, as in `i386/gas.h' --karl@cs.umb.edu */ 170#undef LPREFIX 171#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L") 172 173/* supply our own hook for calling __main() from main() */ 174#undef INVOKE__main 175#define INVOKE__main 176#undef GEN_CALL__MAIN 177#define GEN_CALL__MAIN \ 178 do { \ 179 if (!(TARGET_ELF)) \ 180 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \ 181 VOIDmode, 0); \ 182 } while (0) 183 184/* Tell final.c that we don't need a label passed to mcount. */ 185#define NO_PROFILE_COUNTERS 1 186 187/* Output assembler code to FILE to begin profiling of the current function. 188 LABELNO is an optional label. */ 189 190#undef FUNCTION_PROFILER 191#define FUNCTION_PROFILER(FILE, LABELNO) \ 192 do { \ 193 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 194 if (flag_pic) \ 195 fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \ 196 else \ 197 fprintf ((FILE), "\tcall %s\n", _name); \ 198 } while (0) 199 200/* Output assembler code to FILE to end profiling of the current function. */ 201 202#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 203 204 205/************************[ Assembler stuff ]********************************/ 206 207/* Override the default comment-starter of "/" from unix.h. */ 208#undef ASM_COMMENT_START 209#define ASM_COMMENT_START "#" 210 211/* Override the default comment-starter of "/APP" from unix.h. */ 212#undef ASM_APP_ON 213#define ASM_APP_ON "#APP\n" 214#undef ASM_APP_OFF 215#define ASM_APP_OFF "#NO_APP\n" 216 217/* This is how to store into the string BUF 218 the symbol_ref name of an internal numbered label where 219 PREFIX is the class of label and NUM is the number within the class. 220 This is suitable for output with `assemble_name'. */ 221#undef ASM_GENERATE_INTERNAL_LABEL 222#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ 223 sprintf ((LABEL), "*%s%s%u", (TARGET_UNDERSCORES) ? "" : ".", \ 224 (PREFIX), (unsigned) (NUM)) 225 226/* This is how to output an internal numbered label where 227 PREFIX is the class of label and NUM is the number within the class. 228 For most svr4/ELF systems, the convention is that any symbol which begins 229 with a period is not put into the linker symbol table by the assembler. */ 230#undef ASM_OUTPUT_INTERNAL_LABEL 231#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \ 232 fprintf ((FILE), "%s%s%u:\n", (TARGET_UNDERSCORES) ? "" : ".", \ 233 (PREFIX), (unsigned) (NUM)) 234 235/* This is how to output a reference to a user-level label named NAME. */ 236#undef ASM_OUTPUT_LABELREF 237#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 238 do { \ 239 char *_name = (NAME); \ 240 /* Hack to avoid writing lots of rtl in \ 241 FUNCTION_PROFILER_EPILOGUE (). */ \ 242 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 243 { \ 244 if (TARGET_AOUT) \ 245 _name++; \ 246 if (flag_pic) \ 247 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 248 else \ 249 fprintf ((FILE), "%s", _name); \ 250 } \ 251 else \ 252 fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \ 253} while (0) 254 255/* This is how to hack on the symbol code of certain relcalcitrant 256 symbols to modify their output in output_pic_addr_const (). */ 257 258#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 259 260#undef ASM_OUTPUT_ALIGN 261#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 262 do { \ 263 if ((LOG)!=0) { \ 264 if (in_text_section()) \ 265 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 266 else \ 267 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 268 } \ 269 } while (0) 270 271#undef ASM_OUTPUT_ALIGNED_COMMON 272#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 273 do { \ 274 if (TARGET_ELF) \ 275 { \ 276 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 277 assemble_name ((FILE), (NAME)); \ 278 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 279 } \ 280 else \ 281 { \ 282 int alignbytes = ((ALIGN) + BITS_PER_UNIT - 1) / BITS_PER_UNIT; \ 283 int rounded = (SIZE); \ 284 rounded += alignbytes - 1; \ 285 rounded = (rounded / alignbytes) * alignbytes; \ 286 fprintf ((FILE), "%s ", COMMON_ASM_OP); \ 287 assemble_name ((FILE), (NAME)); \ 288 fprintf ((FILE), ",%u\n", (rounded)); \ 289 } \ 290 } while (0) 291 292/* This says how to output assembler code to declare an 293 uninitialized internal linkage data object. Under SVR4, 294 the linker seems to want the alignment of data objects 295 to depend on their types. We do exactly that here. */ 296 297#undef ASM_OUTPUT_ALIGNED_LOCAL 298#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 299 do { \ 300 if (TARGET_ELF) \ 301 { \ 302 fprintf ((FILE), "%s", LOCAL_ASM_OP); \ 303 assemble_name ((FILE), (NAME)); \ 304 fprintf ((FILE), "\n"); \ 305 ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \ 306 } \ 307 else \ 308 { \ 309 int rounded = (SIZE); \ 310 if (rounded == 0) rounded = 1; \ 311 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 312 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 313 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 314 fputs ("\t.lcomm\t", (FILE)); \ 315 assemble_name ((FILE), (NAME)); \ 316 fprintf ((FILE), ",%u\n", (rounded)); \ 317 } \ 318 } while (0) 319 320/* How to output some space. The rules are different depending on the 321 object format. */ 322#undef ASM_OUTPUT_SKIP 323#define ASM_OUTPUT_SKIP(FILE, SIZE) \ 324 do { \ 325 if (TARGET_ELF) \ 326 { \ 327 fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \ 328 } \ 329 else \ 330 { \ 331 fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \ 332 } \ 333 } while (0) 334 335#undef ASM_OUTPUT_SOURCE_LINE 336#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \ 337 do { \ 338 static int sym_lineno = 1; \ 339 if (TARGET_ELF) \ 340 { \ 341 fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \ 342 assemble_name ((FILE), \ 343 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 344 fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \ 345 sym_lineno += 1; \ 346 } \ 347 else \ 348 { \ 349 fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \ 350 lineno); \ 351 } \ 352 } while (0) 353 354/* A C statement to output to the stdio stream FILE an assembler 355 command to advance the location counter to a multiple of 1<<LOG 356 bytes if it is within MAX_SKIP bytes. 357 358 This is used to align code labels according to Intel recommendations. */ 359 360/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE, 361 but it is easier to fix in an MD way. */ 362 363#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 364#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 365 do { \ 366 if ((LOG) != 0) { \ 367 if (TARGET_AOUT) \ 368 ASM_OUTPUT_ALIGN ((FILE), (LOG)); \ 369 else if ((MAX_SKIP) == 0) \ 370 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 371 else \ 372 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 373 } \ 374 } while (0) 375#endif 376 377 378/************************[ Debugger stuff ]*********************************/ 379 380/* The a.out tools do not support "Lscope" .stabs symbols. */ 381#undef NO_DBX_FUNCTION_END 382#define NO_DBX_FUNCTION_END TARGET_AOUT 383 384/* In ELF, the function stabs come first, before the relative offsets. */ 385#undef DBX_FUNCTION_FIRST 386#define DBX_CHECK_FUNCTION_FIRST TARGET_ELF 387 388#undef DBX_REGISTER_NUMBER 389#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 390 : (write_symbols == DWARF2_DEBUG \ 391 || write_symbols == DWARF_DEBUG) \ 392 ? svr4_dbx_register_map[(n)] \ 393 : dbx_register_map[(n)]) 394 395/* tag end of file in elf mode */ 396#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END 397#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 398 do { \ 399 if (TARGET_ELF) { \ 400 fprintf ((FILE), "\t.text\n\t.stabs \"\",%d,0,0,%LLetext\n%LLetext:\n", \ 401 N_SO); \ 402 } \ 403 } while (0) 404 405/* stabs-in-elf has offsets relative to function beginning */ 406#undef DBX_OUTPUT_LBRAC 407#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 408 do { \ 409 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 410 assemble_name (asmfile, buf); \ 411 if (TARGET_ELF) \ 412 { \ 413 fputc ('-', asmfile); \ 414 assemble_name (asmfile, \ 415 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 416 } \ 417 fprintf (asmfile, "\n"); \ 418 } while (0) 419 420#undef DBX_OUTPUT_RBRAC 421#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 422 do { \ 423 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 424 assemble_name (asmfile, buf); \ 425 if (TARGET_ELF) \ 426 { \ 427 fputc ('-', asmfile); \ 428 assemble_name (asmfile, \ 429 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 430 } \ 431 fprintf (asmfile, "\n"); \ 432 } while (0) 433