freebsd.h revision 99884
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 99884 2002-07-12 17:44:24Z obrien $ */ 27 28#undef CC1_SPEC 29#define CC1_SPEC "%(cc1_cpu) %{profile:-p} \ 30 %{gline:%{!g:%{!g0:%{!g1:%{!g2: -g1}}}}} \ 31 %{maout: %{!mno-underscores: %{!munderscores: -munderscores }}}" 32 33#undef ASM_SPEC 34#define ASM_SPEC "%{v*: -v} %{maout: %{fpic:-k} %{fPIC:-k}}" 35 36#undef ASM_FINAL_SPEC 37#define ASM_FINAL_SPEC "%|" 38 39/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 40 for the special GCC options -static and -shared, which allow us to 41 link things in one of these three modes by applying the appropriate 42 combinations of options at link-time. We like to support here for 43 as many of the other GNU linker options as possible. But I don't 44 have the time to search for those flags. I am sure how to add 45 support for -soname shared_object_name. H.J. 46 47 When the -shared link option is used a final link is not being 48 done. */ 49 50#undef LINK_SPEC 51#define LINK_SPEC "\ 52 %{p:%e`-p' not supported; use `-pg' and gprof(1)} \ 53 %{maout: %{shared:-Bshareable} \ 54 %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \ 55 %{pg:-Bstatic} %{Z}} \ 56 %{assert*} %{R*}} \ 57 %{!maout: \ 58 %{Wl,*:%*} \ 59 %{v:-V} \ 60 %{assert*} %{R*} %{rpath*} %{defsym*} \ 61 %{shared:-Bshareable %{h*} %{soname*}} \ 62 %{!shared: \ 63 %{!static: \ 64 %{rdynamic: -export-dynamic} \ 65 %{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \ 66 %{static:-Bstatic}} \ 67 %{symbolic:-Bsymbolic}}" 68 69/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add the magical 70 crtbegin.o file (see crtstuff.c) which provides part of the support for 71 getting C++ file-scope static object constructed before entering `main'. */ 72 73#undef STARTFILE_SPEC 74#define STARTFILE_SPEC "\ 75 %{maout: %{shared:c++rt0.o%s} \ 76 %{!shared: \ 77 %{pg:gcrt0.o%s}%{!pg: \ 78 %{static:scrt0.o%s} \ 79 %{!static:crt0.o%s}}}} \ 80 %{!maout: \ 81 %{!shared: \ 82 %{pg:gcrt1.o%s} \ 83 %{!pg: \ 84 %{p:gcrt1.o%s} \ 85 %{!p:crt1.o%s}}} \ 86 crti.o%s \ 87 %{!shared:crtbegin.o%s} \ 88 %{shared:crtbeginS.o%s}}" 89 90/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our 91 own magical crtend.o file (see crtstuff.c) which provides part of the 92 support for getting C++ file-scope static object constructed before 93 entering `main', followed by the normal "finalizer" file, `crtn.o'. */ 94 95#undef ENDFILE_SPEC 96#define ENDFILE_SPEC "\ 97 %{!maout: \ 98 %{!shared:crtend.o%s} \ 99 %{shared:crtendS.o%s} crtn.o%s}" 100 101 102/************************[ Target stuff ]***********************************/ 103 104/* Define the actual types of some ANSI-mandated types. 105 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 106 c-common.c, and config/<arch>/<arch>.h. */ 107 108#undef SIZE_TYPE 109#define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int") 110 111#undef PTRDIFF_TYPE 112#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int") 113 114#undef WCHAR_TYPE_SIZE 115#define WCHAR_TYPE_SIZE (TARGET_64BIT ? 32 : BITS_PER_WORD) 116 117#undef TARGET_VERSION 118#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 119 120#define MASK_PROFILER_EPILOGUE 010000000000 121#define MASK_AOUT 004000000000 /* a.out not elf */ 122#define MASK_UNDERSCORES 002000000000 /* use leading _ */ 123 124#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 125#define TARGET_AOUT (target_flags & MASK_AOUT) 126#define TARGET_ELF ((target_flags & MASK_AOUT) == 0) 127#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0) 128 129#undef SUBTARGET_SWITCHES 130#define SUBTARGET_SWITCHES \ 131 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 132 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \ 133 { "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \ 134 { "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \ 135 { "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \ 136 { "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"}, 137 138/* This goes away when the math emulator is fixed. */ 139#undef TARGET_SUBTARGET_DEFAULT 140#define TARGET_SUBTARGET_DEFAULT \ 141 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 142 143/* Don't default to pcc-struct-return, we want to retain compatibility with 144 older gcc versions AND pcc-struct-return is nonreentrant. 145 (even though the SVR4 ABI for the i386 says that records and unions are 146 returned in memory). */ 147 148#undef DEFAULT_PCC_STRUCT_RETURN 149#define DEFAULT_PCC_STRUCT_RETURN 0 150 151/* The a.out tools do not support "linkonce" sections. */ 152#undef SUPPORTS_ONE_ONLY 153#define SUPPORTS_ONE_ONLY TARGET_ELF 154 155/* Prefix for internally generated assembler labels. If we aren't using 156 underscores, we are using prefix `.'s to identify labels that should 157 be ignored, as in `i386/gas.h' --karl@cs.umb.edu */ 158#undef LPREFIX 159#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L") 160 161/* supply our own hook for calling __main() from main() */ 162#undef INVOKE__main 163#define INVOKE__main 164#undef GEN_CALL__MAIN 165#define GEN_CALL__MAIN \ 166 do { \ 167 if (!(TARGET_ELF)) \ 168 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \ 169 VOIDmode, 0); \ 170 } while (0) 171 172/* Tell final.c that we don't need a label passed to mcount. */ 173#define NO_PROFILE_COUNTERS 1 174 175/* Output assembler code to FILE to begin profiling of the current function. 176 LABELNO is an optional label. */ 177 178#undef FUNCTION_PROFILER 179#define FUNCTION_PROFILER(FILE, LABELNO) \ 180 do { \ 181 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 182 if (flag_pic) \ 183 fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \ 184 else \ 185 fprintf ((FILE), "\tcall %s\n", _name); \ 186 } while (0) 187 188/* Output assembler code to FILE to end profiling of the current function. */ 189 190#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 191 192 193/************************[ Assembler stuff ]********************************/ 194 195/* Override the default comment-starter of "/" from unix.h. */ 196#undef ASM_COMMENT_START 197#define ASM_COMMENT_START "#" 198 199/* Override the default comment-starter of "/APP" from unix.h. */ 200#undef ASM_APP_ON 201#define ASM_APP_ON "#APP\n" 202#undef ASM_APP_OFF 203#define ASM_APP_OFF "#NO_APP\n" 204 205/* Override the default string pseudo-op of "\t.string\t" from ../elfos.h. 206 ".string" doesn't work for the aout case. */ 207#undef STRING_ASM_OP 208#define STRING_ASM_OP (TARGET_AOUT ? "\t.asciz\t" : "\t.string\t") 209 210/* Override the use of "\t.section\t.rodata" from ../elfos.h. Neither 211 ".section" nor "rodata" works for the aout case. This forces a fallback 212 to ".text". */ 213#undef USE_CONST_SECTION 214#define USE_CONST_SECTION TARGET_ELF 215 216/* This is how to store into the string BUF 217 the symbol_ref name of an internal numbered label where 218 PREFIX is the class of label and NUM is the number within the class. 219 This is suitable for output with `assemble_name'. */ 220#undef ASM_GENERATE_INTERNAL_LABEL 221#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ 222 sprintf ((LABEL), "*%s%s%u", (TARGET_UNDERSCORES) ? "" : ".", \ 223 (PREFIX), (unsigned) (NUM)) 224 225/* This is how to output an internal numbered label where 226 PREFIX is the class of label and NUM is the number within the class. 227 For most svr4/ELF systems, the convention is that any symbol which begins 228 with a period is not put into the linker symbol table by the assembler. */ 229#undef ASM_OUTPUT_INTERNAL_LABEL 230#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \ 231 fprintf ((FILE), "%s%s%u:\n", (TARGET_UNDERSCORES) ? "" : ".", \ 232 (PREFIX), (unsigned) (NUM)) 233 234/* This is how to output a reference to a user-level label named NAME. */ 235#undef ASM_OUTPUT_LABELREF 236#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 237 do { \ 238 char *_name = (NAME); \ 239 /* Hack to avoid writing lots of rtl in \ 240 FUNCTION_PROFILER_EPILOGUE (). */ \ 241 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 242 { \ 243 if (TARGET_AOUT) \ 244 _name++; \ 245 if (flag_pic) \ 246 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 247 else \ 248 fprintf ((FILE), "%s", _name); \ 249 } \ 250 else \ 251 fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \ 252} while (0) 253 254/* This is how to hack on the symbol code of certain relcalcitrant 255 symbols to modify their output in output_pic_addr_const (). */ 256 257#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 258 259#undef ASM_OUTPUT_ALIGN 260#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 261 do { \ 262 if ((LOG)!=0) { \ 263 if (in_text_section()) \ 264 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 265 else \ 266 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 267 } \ 268 } while (0) 269 270#undef ASM_OUTPUT_ALIGNED_COMMON 271#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 272 do { \ 273 if (TARGET_ELF) \ 274 { \ 275 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 276 assemble_name ((FILE), (NAME)); \ 277 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 278 } \ 279 else \ 280 { \ 281 int alignbytes = ((ALIGN) + BITS_PER_UNIT - 1) / BITS_PER_UNIT; \ 282 int rounded = (SIZE); \ 283 rounded += alignbytes - 1; \ 284 rounded = (rounded / alignbytes) * alignbytes; \ 285 fprintf ((FILE), "%s ", COMMON_ASM_OP); \ 286 assemble_name ((FILE), (NAME)); \ 287 fprintf ((FILE), ",%u\n", (rounded)); \ 288 } \ 289 } while (0) 290 291/* This says how to output assembler code to declare an 292 uninitialized internal linkage data object. Under SVR4, 293 the linker seems to want the alignment of data objects 294 to depend on their types. We do exactly that here. */ 295 296#undef ASM_OUTPUT_ALIGNED_LOCAL 297#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 298 do { \ 299 if (TARGET_ELF) \ 300 { \ 301 fprintf ((FILE), "%s", LOCAL_ASM_OP); \ 302 assemble_name ((FILE), (NAME)); \ 303 fprintf ((FILE), "\n"); \ 304 ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \ 305 } \ 306 else \ 307 { \ 308 int rounded = (SIZE); \ 309 if (rounded == 0) rounded = 1; \ 310 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 311 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 312 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 313 fputs ("\t.lcomm\t", (FILE)); \ 314 assemble_name ((FILE), (NAME)); \ 315 fprintf ((FILE), ",%u\n", (rounded)); \ 316 } \ 317 } while (0) 318 319/* How to output some space. The rules are different depending on the 320 object format. */ 321#undef ASM_OUTPUT_SKIP 322#define ASM_OUTPUT_SKIP(FILE, SIZE) \ 323 do { \ 324 if (TARGET_ELF) \ 325 { \ 326 fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \ 327 } \ 328 else \ 329 { \ 330 fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \ 331 } \ 332 } while (0) 333 334#undef ASM_OUTPUT_SOURCE_LINE 335#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \ 336 do { \ 337 static int sym_lineno = 1; \ 338 if (TARGET_ELF) \ 339 { \ 340 fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \ 341 assemble_name ((FILE), \ 342 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 343 fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \ 344 sym_lineno += 1; \ 345 } \ 346 else \ 347 { \ 348 fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \ 349 lineno); \ 350 } \ 351 } while (0) 352 353/* A C statement to output to the stdio stream FILE an assembler 354 command to advance the location counter to a multiple of 1<<LOG 355 bytes if it is within MAX_SKIP bytes. 356 357 This is used to align code labels according to Intel recommendations. */ 358 359/* XXX configuration of this is broken in the same way as HAVE_GAS_SHF_MERGE, 360 but it is easier to fix in an MD way. */ 361 362#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 363#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 364 do { \ 365 if ((LOG) != 0) { \ 366 if (TARGET_AOUT) \ 367 ASM_OUTPUT_ALIGN ((FILE), (LOG)); \ 368 else if ((MAX_SKIP) == 0) \ 369 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 370 else \ 371 fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 372 } \ 373 } while (0) 374#endif 375 376 377/************************[ Debugger stuff ]*********************************/ 378 379/* The a.out tools do not support "Lscope" .stabs symbols. */ 380#undef NO_DBX_FUNCTION_END 381#define NO_DBX_FUNCTION_END TARGET_AOUT 382 383#undef DBX_REGISTER_NUMBER 384#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 385 : (write_symbols == DWARF2_DEBUG \ 386 || write_symbols == DWARF_DEBUG) \ 387 ? svr4_dbx_register_map[(n)] \ 388 : dbx_register_map[(n)]) 389 390/* The same functions are used to creating the DWARF2 debug info and C++ 391 unwind info (except.c). Regardless of the debug format requested, the 392 register numbers used in exception unwinding sections still have to be 393 DWARF compatible. IMO the GCC folks may be abusing the DBX_REGISTER_NUMBER 394 macro to mean too much. */ 395#define DWARF_FRAME_REGNUM(n) (TARGET_64BIT ? dbx64_register_map[n] \ 396 : svr4_dbx_register_map[(n)]) 397 398/* tag end of file in elf mode */ 399#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END 400#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 401 do { \ 402 if (TARGET_ELF) { \ 403 asm_fprintf ((FILE), \ 404 "\t.text\n\t.stabs \"\",%d,0,0,%LLetext\n%LLetext:\n",\ 405 N_SO); \ 406 } \ 407 } while (0) 408 409/* stabs-in-elf has offsets relative to function beginning */ 410#undef DBX_OUTPUT_LBRAC 411#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 412 do { \ 413 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 414 assemble_name (asmfile, buf); \ 415 if (TARGET_ELF) \ 416 { \ 417 fputc ('-', asmfile); \ 418 assemble_name (asmfile, \ 419 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 420 } \ 421 fprintf (asmfile, "\n"); \ 422 } while (0) 423 424#undef DBX_OUTPUT_RBRAC 425#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 426 do { \ 427 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 428 assemble_name (asmfile, buf); \ 429 if (TARGET_ELF) \ 430 { \ 431 fputc ('-', asmfile); \ 432 assemble_name (asmfile, \ 433 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 434 } \ 435 fprintf (asmfile, "\n"); \ 436 } while (0) 437