freebsd.h revision 96144
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 96144 2002-05-07 02:26:40Z 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}" 103 104 105/************************[ Target stuff ]***********************************/ 106 107/* Define the actual types of some ANSI-mandated types. 108 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 109 c-common.c, and config/<arch>/<arch>.h. */ 110 111#undef SIZE_TYPE 112#define SIZE_TYPE "unsigned int" 113 114#undef PTRDIFF_TYPE 115#define PTRDIFF_TYPE "int" 116 117#undef WCHAR_TYPE_SIZE 118#define WCHAR_TYPE_SIZE BITS_PER_WORD 119 120#undef TARGET_VERSION 121#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 122 123#define MASK_PROFILER_EPILOGUE 010000000000 124#define MASK_AOUT 004000000000 /* a.out not elf */ 125#define MASK_UNDERSCORES 002000000000 /* use leading _ */ 126 127#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 128#define TARGET_AOUT (target_flags & MASK_AOUT) 129#define TARGET_ELF ((target_flags & MASK_AOUT) == 0) 130#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0) 131 132#undef SUBTARGET_SWITCHES 133#define SUBTARGET_SWITCHES \ 134 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 135 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \ 136 { "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \ 137 { "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \ 138 { "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \ 139 { "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"}, 140 141/* This goes away when the math emulator is fixed. */ 142#undef TARGET_SUBTARGET_DEFAULT 143#define TARGET_SUBTARGET_DEFAULT \ 144 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 145 146/* Don't default to pcc-struct-return, we want to retain compatibility with 147 older gcc versions AND pcc-struct-return is nonreentrant. 148 (even though the SVR4 ABI for the i386 says that records and unions are 149 returned in memory). */ 150 151#undef DEFAULT_PCC_STRUCT_RETURN 152#define DEFAULT_PCC_STRUCT_RETURN 0 153 154/* The a.out tools do not support "linkonce" sections. */ 155#undef SUPPORTS_ONE_ONLY 156#define SUPPORTS_ONE_ONLY TARGET_ELF 157 158/* Prefix for internally generated assembler labels. If we aren't using 159 underscores, we are using prefix `.'s to identify labels that should 160 be ignored, as in `i386/gas.h' --karl@cs.umb.edu */ 161#undef LPREFIX 162#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L") 163 164/* supply our own hook for calling __main() from main() */ 165#undef INVOKE__main 166#define INVOKE__main 167#undef GEN_CALL__MAIN 168#define GEN_CALL__MAIN \ 169 do { \ 170 if (!(TARGET_ELF)) \ 171 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \ 172 VOIDmode, 0); \ 173 } while (0) 174 175/* Tell final.c that we don't need a label passed to mcount. */ 176#define NO_PROFILE_COUNTERS 1 177 178/* Output assembler code to FILE to begin profiling of the current function. 179 LABELNO is an optional label. */ 180 181#undef FUNCTION_PROFILER 182#define FUNCTION_PROFILER(FILE, LABELNO) \ 183 do { \ 184 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 185 if (flag_pic) \ 186 fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \ 187 else \ 188 fprintf ((FILE), "\tcall %s\n", _name); \ 189 } while (0) 190 191/* Output assembler code to FILE to end profiling of the current function. */ 192 193#undef FUNCTION_PROFILER_EPILOGUE /* BDE will need to fix this. */ 194 195 196/************************[ Assembler stuff ]********************************/ 197 198/* Override the default comment-starter of "/" from unix.h. */ 199#undef ASM_COMMENT_START 200#define ASM_COMMENT_START "#" 201 202/* Override the default comment-starter of "/APP" from unix.h. */ 203#undef ASM_APP_ON 204#define ASM_APP_ON "#APP\n" 205#undef ASM_APP_OFF 206#define ASM_APP_OFF "#NO_APP\n" 207 208/* This is how to store into the string BUF 209 the symbol_ref name of an internal numbered label where 210 PREFIX is the class of label and NUM is the number within the class. 211 This is suitable for output with `assemble_name'. */ 212#undef ASM_GENERATE_INTERNAL_LABEL 213#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ 214 sprintf ((LABEL), "*%s%s%u", (TARGET_UNDERSCORES) ? "" : ".", \ 215 (PREFIX), (unsigned) (NUM)) 216 217/* This is how to output an internal numbered label where 218 PREFIX is the class of label and NUM is the number within the class. 219 For most svr4/ELF systems, the convention is that any symbol which begins 220 with a period is not put into the linker symbol table by the assembler. */ 221#undef ASM_OUTPUT_INTERNAL_LABEL 222#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \ 223 fprintf ((FILE), "%s%s%u:\n", (TARGET_UNDERSCORES) ? "" : ".", \ 224 (PREFIX), (unsigned) (NUM)) 225 226/* This is how to output a reference to a user-level label named NAME. */ 227#undef ASM_OUTPUT_LABELREF 228#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 229 do { \ 230 char *_name = (NAME); \ 231 /* Hack to avoid writing lots of rtl in \ 232 FUNCTION_PROFILER_EPILOGUE (). */ \ 233 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 234 { \ 235 if (TARGET_AOUT) \ 236 _name++; \ 237 if (flag_pic) \ 238 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 239 else \ 240 fprintf ((FILE), "%s", _name); \ 241 } \ 242 else \ 243 fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \ 244} while (0) 245 246/* This is how to hack on the symbol code of certain relcalcitrant 247 symbols to modify their output in output_pic_addr_const (). */ 248 249#undef ASM_HACK_SYMBOLREF_CODE /* BDE will need to fix this. */ 250 251#undef ASM_OUTPUT_ALIGN 252#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 253 if ((LOG)!=0) { \ 254 if (in_text_section()) \ 255 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 256 else \ 257 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 258 } 259 260#undef ASM_OUTPUT_ALIGNED_COMMON 261#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 262 do { \ 263 if (TARGET_ELF) \ 264 { \ 265 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 266 assemble_name ((FILE), (NAME)); \ 267 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 268 } \ 269 else \ 270 { \ 271 int rounded = (SIZE); \ 272 if (rounded == 0) rounded = 1; \ 273 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 274 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 275 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 276 fprintf ((FILE), "%s ", COMMON_ASM_OP); \ 277 assemble_name ((FILE), (NAME)); \ 278 fprintf ((FILE), ",%u\n", (rounded)); \ 279 } \ 280 } while (0) 281 282/* This says how to output assembler code to declare an 283 uninitialized internal linkage data object. Under SVR4, 284 the linker seems to want the alignment of data objects 285 to depend on their types. We do exactly that here. */ 286 287#undef ASM_OUTPUT_ALIGNED_LOCAL 288#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 289 do { \ 290 if (TARGET_ELF) \ 291 { \ 292 fprintf ((FILE), "%s", LOCAL_ASM_OP); \ 293 assemble_name ((FILE), (NAME)); \ 294 fprintf ((FILE), "\n"); \ 295 ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \ 296 } \ 297 else \ 298 { \ 299 int rounded = (SIZE); \ 300 if (rounded == 0) rounded = 1; \ 301 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 302 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 303 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 304 fputs ("\t.lcomm\t", (FILE)); \ 305 assemble_name ((FILE), (NAME)); \ 306 fprintf ((FILE), ",%u\n", (rounded)); \ 307 } \ 308 } while (0) 309 310/* How to output some space. The rules are different depending on the 311 object format. */ 312#undef ASM_OUTPUT_SKIP 313#define ASM_OUTPUT_SKIP(FILE, SIZE) \ 314 do { \ 315 if (TARGET_ELF) \ 316 { \ 317 fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \ 318 } \ 319 else \ 320 { \ 321 fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \ 322 } \ 323 } while (0) 324 325#undef ASM_OUTPUT_SOURCE_LINE 326#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \ 327 do { \ 328 static int sym_lineno = 1; \ 329 if (TARGET_ELF) \ 330 { \ 331 fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \ 332 assemble_name ((FILE), \ 333 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 334 fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \ 335 sym_lineno += 1; \ 336 } \ 337 else \ 338 { \ 339 fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \ 340 lineno); \ 341 } \ 342 } while (0) 343 344/* A C statement to output to the stdio stream FILE an assembler 345 command to advance the location counter to a multiple of 1<<LOG 346 bytes if it is within MAX_SKIP bytes. 347 348 This is used to align code labels according to Intel recommendations. */ 349 350#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN 351#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE, LOG, MAX_SKIP) \ 352 if ((LOG) != 0) { \ 353 if ((MAX_SKIP) == 0) fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 354 else fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \ 355 } 356#endif 357 358 359/************************[ Debugger stuff ]*********************************/ 360 361/* The a.out tools do not support "Lscope" .stabs symbols. */ 362#undef NO_DBX_FUNCTION_END 363#define NO_DBX_FUNCTION_END TARGET_AOUT 364 365/* In ELF, the function stabs come first, before the relative offsets. */ 366#undef DBX_FUNCTION_FIRST 367#define DBX_CHECK_FUNCTION_FIRST TARGET_ELF 368 369#undef DBX_REGISTER_NUMBER 370#define DBX_REGISTER_NUMBER(n) (TARGET_64BIT ? dbx64_register_map[n] \ 371 : (write_symbols == DWARF2_DEBUG \ 372 || write_symbols == DWARF_DEBUG) \ 373 ? svr4_dbx_register_map[(n)] \ 374 : dbx_register_map[(n)]) 375 376/* tag end of file in elf mode */ 377#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END 378#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 379 do { \ 380 if (TARGET_ELF) { \ 381 fprintf ((FILE), "\t.text\n\t.stabs \"\",%d,0,0,%LLetext\n%LLetext:\n", \ 382 N_SO); \ 383 } \ 384 } while (0) 385 386/* stabs-in-elf has offsets relative to function beginning */ 387#undef DBX_OUTPUT_LBRAC 388#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 389 do { \ 390 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 391 assemble_name (asmfile, buf); \ 392 if (TARGET_ELF) \ 393 { \ 394 fputc ('-', asmfile); \ 395 assemble_name (asmfile, \ 396 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 397 } \ 398 fprintf (asmfile, "\n"); \ 399 } while (0) 400 401#undef DBX_OUTPUT_RBRAC 402#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 403 do { \ 404 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 405 assemble_name (asmfile, buf); \ 406 if (TARGET_ELF) \ 407 { \ 408 fputc ('-', asmfile); \ 409 assemble_name (asmfile, \ 410 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 411 } \ 412 fprintf (asmfile, "\n"); \ 413 } while (0) 414