freebsd.h revision 95349
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 95349 2002-04-24 04:49:34Z obrien $ */ 27 28#undef CPP_PREDEFINES 29#define CPP_PREDEFINES \ 30 "-Di386 -Acpu(i386) -Amachine(i386)" \ 31 FBSD_CPP_PREDEFINES 32 33#undef CC1_SPEC 34#define CC1_SPEC "\ 35 %{gline:%{!g:%{!g0:%{!g1:%{!g2: -g1}}}}} \ 36 %{maout: %{!mno-underscores: %{!munderscores: -munderscores }}}" 37 38#undef ASM_SPEC 39#define ASM_SPEC "%{v*: -v} %{maout: %{fpic:-k} %{fPIC:-k}}" 40 41#undef ASM_FINAL_SPEC 42#define ASM_FINAL_SPEC "%|" 43 44/* Provide a LINK_SPEC appropriate for FreeBSD. Here we provide support 45 for the special GCC options -static and -shared, which allow us to 46 link things in one of these three modes by applying the appropriate 47 combinations of options at link-time. We like to support here for 48 as many of the other GNU linker options as possible. But I don't 49 have the time to search for those flags. I am sure how to add 50 support for -soname shared_object_name. H.J. 51 52 When the -shared link option is used a final link is not being 53 done. */ 54 55#undef LINK_SPEC 56#define LINK_SPEC "\ 57 %{p:%e`-p' not supported; use `-pg' and gprof(1)} \ 58 %{maout: %{shared:-Bshareable} \ 59 %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \ 60 %{pg:-Bstatic} %{Z}} \ 61 %{assert*} %{R*}} \ 62 %{!maout: \ 63 %{Wl,*:%*} \ 64 %{v:-V} \ 65 %{assert*} %{R*} %{rpath*} %{defsym*} \ 66 %{shared:-Bshareable %{h*} %{soname*}} \ 67 %{!shared: \ 68 %{!static: \ 69 %{rdynamic: -export-dynamic} \ 70 %{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \ 71 %{static:-Bstatic}} \ 72 %{symbolic:-Bsymbolic}}" 73 74/* Provide a STARTFILE_SPEC appropriate for FreeBSD. Here we add the magical 75 crtbegin.o file (see crtstuff.c) which provides part of the support for 76 getting C++ file-scope static object constructed before entering `main'. */ 77 78#undef STARTFILE_SPEC 79#define STARTFILE_SPEC "\ 80 %{maout: %{shared:c++rt0.o%s} \ 81 %{!shared: \ 82 %{pg:gcrt0.o%s}%{!pg: \ 83 %{static:scrt0.o%s} \ 84 %{!static:crt0.o%s}}}} \ 85 %{!maout: \ 86 %{!shared: \ 87 %{pg:gcrt1.o%s} \ 88 %{!pg: \ 89 %{p:gcrt1.o%s} \ 90 %{!p:crt1.o%s}}} \ 91 crti.o%s \ 92 %{!shared:crtbegin.o%s} \ 93 %{shared:crtbeginS.o%s}}" 94 95/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our 96 own magical crtend.o file (see crtstuff.c) which provides part of the 97 support for getting C++ file-scope static object constructed before 98 entering `main', followed by the normal "finalizer" file, `crtn.o'. */ 99 100#undef ENDFILE_SPEC 101#define ENDFILE_SPEC "\ 102 %{!maout: \ 103 %{!shared:crtend.o%s} \ 104 %{shared:crtendS.o%s} crtn.o%s}" 105 106 107/************************[ Target stuff ]***********************************/ 108 109/* Define the actual types of some ANSI-mandated types. 110 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 111 c-common.c, and config/<arch>/<arch>.h. */ 112 113#undef SIZE_TYPE 114#define SIZE_TYPE "unsigned int" 115 116#undef PTRDIFF_TYPE 117#define PTRDIFF_TYPE "int" 118 119#undef WCHAR_TYPE_SIZE 120#define WCHAR_TYPE_SIZE BITS_PER_WORD 121 122/* This is the pseudo-op used to generate a 32-bit word of data with a 123 specific value in some section. */ 124 125#undef INT_ASM_OP 126#define INT_ASM_OP ".long" 127 128/* Biggest alignment supported by the object file format of this 129 machine. Use this macro to limit the alignment which can be 130 specified using the `__attribute__ ((aligned (N)))' construct. If 131 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 132 133#define MAX_OFILE_ALIGNMENT (32768*8) 134 135#undef TARGET_VERSION 136#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 137 138#define MASK_PROFILER_EPILOGUE 010000000000 139#define MASK_AOUT 004000000000 /* a.out not elf */ 140#define MASK_UNDERSCORES 002000000000 /* use leading _ */ 141 142#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 143#define TARGET_AOUT (target_flags & MASK_AOUT) 144#define TARGET_ELF ((target_flags & MASK_AOUT) == 0) 145#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0) 146 147#undef SUBTARGET_SWITCHES 148#define SUBTARGET_SWITCHES \ 149 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 150 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \ 151 { "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \ 152 { "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \ 153 { "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \ 154 { "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"}, 155 156/* This goes away when the math emulator is fixed. */ 157#undef TARGET_DEFAULT 158#define TARGET_DEFAULT \ 159 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 160 161/* Don't default to pcc-struct-return, we want to retain compatibility with 162 older gcc versions AND pcc-struct-return is nonreentrant. 163 (even though the SVR4 ABI for the i386 says that records and unions are 164 returned in memory). */ 165 166#undef DEFAULT_PCC_STRUCT_RETURN 167#define DEFAULT_PCC_STRUCT_RETURN 0 168 169/* The a.out tools do not support "linkonce" sections. */ 170#undef SUPPORTS_ONE_ONLY 171#define SUPPORTS_ONE_ONLY TARGET_ELF 172 173/* Prefix for internally generated assembler labels. If we aren't using 174 underscores, we are using prefix `.'s to identify labels that should 175 be ignored, as in `i386/gas.h' --karl@cs.umb.edu */ 176#undef LPREFIX 177#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L") 178 179/* supply our own hook for calling __main() from main() */ 180#undef INVOKE__main 181#define INVOKE__main 182#undef GEN_CALL__MAIN 183#define GEN_CALL__MAIN \ 184 do { \ 185 if (!(TARGET_ELF)) \ 186 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \ 187 VOIDmode, 0); \ 188 } while (0) 189 190/* Indicate that jump tables go in the text section. This is 191 necessary when compiling PIC code. */ 192#undef JUMP_TABLES_IN_TEXT_SECTION 193#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic) 194 195/* override the exception table positioning */ 196#undef EXCEPTION_SECTION 197#define EXCEPTION_SECTION() \ 198 do { \ 199 if (TARGET_ELF) \ 200 { \ 201 named_section (NULL_TREE, ".gcc_except_table", 0); \ 202 } \ 203 else \ 204 { \ 205 if (flag_pic) \ 206 data_section (); \ 207 else \ 208 readonly_data_section (); \ 209 } \ 210 } while (0); 211 212/* Tell final.c that we don't need a label passed to mcount. */ 213#undef NO_PROFILE_COUNTERS 214#define NO_PROFILE_COUNTERS 215 216/* Output assembler code to FILE to begin profiling of the current function. 217 LABELNO is an optional label. */ 218 219#undef FUNCTION_PROFILER 220#define FUNCTION_PROFILER(FILE, LABELNO) \ 221 do { \ 222 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 223 if (flag_pic) \ 224 fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \ 225 else \ 226 fprintf ((FILE), "\tcall %s\n", _name); \ 227 } while (0) 228 229/* Output assembler code to FILE to end profiling of the current function. */ 230 231#undef FUNCTION_PROFILER_EPILOGUE 232#define FUNCTION_PROFILER_EPILOGUE(FILE, DO_RTL) \ 233 do { \ 234 if (TARGET_PROFILER_EPILOGUE) \ 235 { \ 236 if (DO_RTL) \ 237 { \ 238 /* ".mexitcount" is specially handled in \ 239 ASM_HACK_SYMBOLREF () so that we don't need to handle \ 240 flag_pic or TARGET_AOUT here. */ \ 241 rtx xop; \ 242 xop = gen_rtx_MEM (FUNCTION_MODE, \ 243 gen_rtx_SYMBOL_REF (Pmode, ".mexitcount")); \ 244 emit_call_insn (gen_rtx (CALL, VOIDmode, xop, const0_rtx)); \ 245 } \ 246 else \ 247 { \ 248 /* XXX this !DO_RTL case is broken but not actually used. */ \ 249 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 250 if (flag_pic) \ 251 fprintf (FILE, "\tcall *%s@GOT(%%ebx)\n", _name); \ 252 else \ 253 fprintf (FILE, "\tcall %s\n", _name); \ 254 } \ 255 } \ 256 } while (0) 257 258 259/************************[ Assembler stuff ]********************************/ 260 261/* Override the default comment-starter of "/" from unix.h. */ 262#undef ASM_COMMENT_START 263#define ASM_COMMENT_START "#" 264 265#undef ASM_APP_ON 266#define ASM_APP_ON "#APP\n" 267 268#undef ASM_APP_OFF 269#define ASM_APP_OFF "#NO_APP\n" 270 271/* Enable alias attribute support. */ 272#undef SET_ASM_OP 273#define SET_ASM_OP ".set" 274 275/* This is how to begin an assembly language file. 276 The .file command should always begin the output. 277 ELF also needs a .version. */ 278 279#undef ASM_FILE_START 280#define ASM_FILE_START(FILE) \ 281 do { \ 282 output_file_directive ((FILE), main_input_filename); \ 283 if (TARGET_ELF) \ 284 fprintf ((FILE), "\t.version\t\"01.01\"\n"); \ 285 } while (0) 286 287/* This is how to store into the string BUF 288 the symbol_ref name of an internal numbered label where 289 PREFIX is the class of label and NUM is the number within the class. 290 This is suitable for output with `assemble_name'. */ 291#undef ASM_GENERATE_INTERNAL_LABEL 292#define ASM_GENERATE_INTERNAL_LABEL(BUF, PREFIX, NUMBER) \ 293 sprintf ((BUF), "*%s%s%d", (TARGET_UNDERSCORES) ? "" : ".", \ 294 (PREFIX), (NUMBER)) 295 296/* This is how to output an internal numbered label where 297 PREFIX is the class of label and NUM is the number within the class. 298 For most svr4/ELF systems, the convention is that any symbol which begins 299 with a period is not put into the linker symbol table by the assembler. */ 300#undef ASM_OUTPUT_INTERNAL_LABEL 301#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \ 302 fprintf ((FILE), "%s%s%d:\n", (TARGET_UNDERSCORES) ? "" : ".", \ 303 (PREFIX), (NUM)) 304 305/* This is how to output a reference to a user-level label named NAME. */ 306#undef ASM_OUTPUT_LABELREF 307#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 308 do { \ 309 char *_name = (NAME); \ 310 /* Hack to avoid writing lots of rtl in \ 311 FUNCTION_PROFILER_EPILOGUE (). */ \ 312 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 313 { \ 314 if (TARGET_AOUT) \ 315 _name++; \ 316 if (flag_pic) \ 317 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 318 else \ 319 fprintf ((FILE), "%s", _name); \ 320 } \ 321 else \ 322 fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \ 323} while (0) 324 325/* This is how to hack on the symbol code of certain relcalcitrant 326 symbols to modify their output in output_pic_addr_const (). */ 327 328#undef ASM_HACK_SYMBOLREF_CODE 329#define ASM_HACK_SYMBOLREF_CODE(NAME, CODE) \ 330 do { \ 331 /* Part of hack to avoid writing lots of rtl in \ 332 FUNCTION_PROFILER_EPILOGUE (). */ \ 333 char *_name = (NAME); \ 334 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 335 (CODE) = 'X'; \ 336 } while (0) 337 338/* This is how to output an element of a case-vector that is relative. 339 This is only used for PIC code. See comments by the `casesi' insn in 340 i386.md for an explanation of the expression this outputs. */ 341#undef ASM_OUTPUT_ADDR_DIFF_ELT 342#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ 343 fprintf ((FILE), "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, (VALUE)) 344 345#undef ASM_OUTPUT_ALIGN 346#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 347 if ((LOG)!=0) { \ 348 if (in_text_section()) \ 349 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 350 else \ 351 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 352 } 353 354#undef ASM_OUTPUT_ALIGNED_COMMON 355#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 356 do { \ 357 if (TARGET_ELF) \ 358 { \ 359 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 360 assemble_name ((FILE), (NAME)); \ 361 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 362 } \ 363 else \ 364 { \ 365 int rounded = (SIZE); \ 366 if (rounded == 0) rounded = 1; \ 367 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 368 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 369 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 370 fprintf ((FILE), "%s ", COMMON_ASM_OP); \ 371 assemble_name ((FILE), (NAME)); \ 372 fprintf ((FILE), ",%u\n", (rounded)); \ 373 } \ 374 } while (0) 375 376/* This says how to output assembler code to declare an 377 uninitialized internal linkage data object. Under SVR4, 378 the linker seems to want the alignment of data objects 379 to depend on their types. We do exactly that here. */ 380 381#undef ASM_OUTPUT_ALIGNED_LOCAL 382#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 383 do { \ 384 if (TARGET_ELF) \ 385 { \ 386 fprintf ((FILE), "%s", LOCAL_ASM_OP); \ 387 assemble_name ((FILE), (NAME)); \ 388 fprintf ((FILE), "\n"); \ 389 ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \ 390 } \ 391 else \ 392 { \ 393 int rounded = (SIZE); \ 394 if (rounded == 0) rounded = 1; \ 395 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 396 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 397 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 398 fputs ("\t.lcomm\t", (FILE)); \ 399 assemble_name ((FILE), (NAME)); \ 400 fprintf ((FILE), ",%u\n", (rounded)); \ 401 } \ 402 } while (0) 403 404/* How to output some space. The rules are different depending on the 405 object format. */ 406#undef ASM_OUTPUT_SKIP 407#define ASM_OUTPUT_SKIP(FILE, SIZE) \ 408 do { \ 409 if (TARGET_ELF) \ 410 { \ 411 fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \ 412 } \ 413 else \ 414 { \ 415 fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \ 416 } \ 417 } while (0) 418 419#undef ASM_OUTPUT_SOURCE_LINE 420#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \ 421 do { \ 422 static int sym_lineno = 1; \ 423 if (TARGET_ELF) \ 424 { \ 425 fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \ 426 assemble_name ((FILE), \ 427 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 428 fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \ 429 sym_lineno += 1; \ 430 } \ 431 else \ 432 { \ 433 fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \ 434 lineno); \ 435 } \ 436 } while (0) 437 438/* These macros generate the special .type and .size directives which 439 are used to set the corresponding fields of the linker symbol table 440 entries in an ELF object file under SVR4. These macros also output 441 the starting labels for the relevant functions/objects. */ 442 443/* Write the extra assembler code needed to declare a function properly. 444 Some svr4 assemblers need to also have something extra said about the 445 function's return value. We allow for that here. */ 446 447#undef ASM_DECLARE_FUNCTION_NAME 448#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 449 do { \ 450 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \ 451 assemble_name (FILE, NAME); \ 452 putc (',', FILE); \ 453 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \ 454 putc ('\n', FILE); \ 455 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 456 ASM_OUTPUT_LABEL(FILE, NAME); \ 457 } while (0) 458 459/* This is how to declare the size of a function. */ 460 461#undef ASM_DECLARE_FUNCTION_SIZE 462#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 463 do { \ 464 if (!flag_inhibit_size_directive) \ 465 { \ 466 char label[256]; \ 467 static int labelno; \ 468 labelno++; \ 469 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \ 470 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \ 471 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ 472 assemble_name (FILE, (FNAME)); \ 473 fprintf (FILE, ","); \ 474 assemble_name (FILE, label); \ 475 fprintf (FILE, "-"); \ 476 assemble_name (FILE, (FNAME)); \ 477 putc ('\n', FILE); \ 478 } \ 479 } while (0) 480 481 482/* The routine used to output NUL terminated strings. We use a special 483 version of this for most svr4 targets because doing so makes the 484 generated assembly code more compact (and thus faster to assemble) 485 as well as more readable, especially for targets like the i386 486 (where the only alternative is to output character sequences as 487 comma separated lists of numbers). */ 488 489#undef ASM_OUTPUT_LIMITED_STRING 490#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \ 491 do { \ 492 register unsigned char *_limited_str = (unsigned char *) (STR); \ 493 register unsigned ch; \ 494 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \ 495 for (; (ch = *_limited_str); _limited_str++) \ 496 { \ 497 register int escape; \ 498 switch (escape = ESCAPES[ch]) \ 499 { \ 500 case 0: \ 501 putc (ch, (FILE)); \ 502 break; \ 503 case 1: \ 504 fprintf ((FILE), "\\%03o", ch); \ 505 break; \ 506 default: \ 507 putc ('\\', (FILE)); \ 508 putc (escape, (FILE)); \ 509 break; \ 510 } \ 511 } \ 512 fprintf ((FILE), "\"\n"); \ 513 } while (0) 514 515/* Switch into a generic section. 516 517 We make the section read-only and executable for a function decl, 518 read-only for a const data decl, and writable for a non-const data decl. 519 520 If the section has already been defined, we must not 521 emit the attributes here. The SVR4 assembler does not 522 recognize section redefinitions. 523 If DECL is NULL, no attributes are emitted. */ 524 525#undef ASM_OUTPUT_SECTION_NAME 526#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \ 527 do { \ 528 static struct section_info \ 529 { \ 530 struct section_info *next; \ 531 char *name; \ 532 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \ 533 } *sections; \ 534 struct section_info *s; \ 535 char *mode; \ 536 enum sect_enum type; \ 537 \ 538 for (s = sections; s; s = s->next) \ 539 if (!strcmp (NAME, s->name)) \ 540 break; \ 541 \ 542 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \ 543 type = SECT_EXEC, mode = "ax"; \ 544 else if (DECL && DECL_READONLY_SECTION (DECL, RELOC)) \ 545 type = SECT_RO, mode = "a"; \ 546 else \ 547 type = SECT_RW, mode = "aw"; \ 548 \ 549 if (s == 0) \ 550 { \ 551 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \ 552 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \ 553 strcpy (s->name, NAME); \ 554 s->type = type; \ 555 s->next = sections; \ 556 sections = s; \ 557 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \ 558 } \ 559 else \ 560 { \ 561 if (DECL && s->type != type) \ 562 error_with_decl (DECL, "%s causes a section type conflict"); \ 563 \ 564 fprintf (FILE, ".section\t%s\n", NAME); \ 565 } \ 566 } while (0) 567 568#undef MAKE_DECL_ONE_ONLY 569#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 570#undef UNIQUE_SECTION_P 571#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL)) 572#undef UNIQUE_SECTION 573#define UNIQUE_SECTION(DECL,RELOC) \ 574 do { \ 575 int len; \ 576 char *name, *string, *prefix; \ 577 \ 578 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ 579 \ 580 if (! DECL_ONE_ONLY (DECL)) \ 581 { \ 582 prefix = "."; \ 583 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 584 prefix = ".text."; \ 585 else if (DECL_READONLY_SECTION (DECL, RELOC)) \ 586 prefix = ".rodata."; \ 587 else \ 588 prefix = ".data."; \ 589 } \ 590 else if (TREE_CODE (DECL) == FUNCTION_DECL) \ 591 prefix = ".gnu.linkonce.t."; \ 592 else if (DECL_READONLY_SECTION (DECL, RELOC)) \ 593 prefix = ".gnu.linkonce.r."; \ 594 else \ 595 prefix = ".gnu.linkonce.d."; \ 596 \ 597 len = strlen (name) + strlen (prefix); \ 598 string = alloca (len + 1); \ 599 sprintf (string, "%s%s", prefix, name); \ 600 \ 601 DECL_SECTION_NAME (DECL) = build_string (len, string); \ 602 } while (0) 603 604/* A C statement or statements to switch to the appropriate 605 section for output of DECL. DECL is either a `VAR_DECL' node 606 or a constant of some sort. RELOC indicates whether forming 607 the initial value of DECL requires link-time relocations. */ 608 609#undef SELECT_SECTION 610#define SELECT_SECTION(DECL,RELOC) \ 611 { \ 612 if (flag_pic && RELOC) \ 613 data_section (); \ 614 else if (TREE_CODE (DECL) == STRING_CST) \ 615 { \ 616 if (! flag_writable_strings) \ 617 const_section (); \ 618 else \ 619 data_section (); \ 620 } \ 621 else if (TREE_CODE (DECL) == VAR_DECL) \ 622 { \ 623 if (! DECL_READONLY_SECTION (DECL, RELOC)) \ 624 data_section (); \ 625 else \ 626 const_section (); \ 627 } \ 628 else \ 629 const_section (); \ 630 } 631 632/* A C statement (sans semicolon) to output an element in the table of 633 global constructors. */ 634#undef ASM_OUTPUT_CONSTRUCTOR 635#define ASM_OUTPUT_CONSTRUCTOR(FILE, NAME) \ 636 do { \ 637 if (TARGET_ELF) \ 638 { \ 639 ctors_section (); \ 640 fprintf ((FILE), "%s ", INT_ASM_OP); \ 641 assemble_name ((FILE), (NAME)); \ 642 fprintf ((FILE), "\n"); \ 643 } \ 644 else \ 645 { \ 646 fprintf (asm_out_file, "%s \"%s__CTOR_LIST__\",22,0,0,", \ 647 ASM_STABS_OP, (TARGET_UNDERSCORES) ? "_" : ""); \ 648 assemble_name (asm_out_file, name); \ 649 fputc ('\n', asm_out_file); \ 650 } \ 651 } while (0) 652 653/* A C statement (sans semicolon) to output an element in the table of 654 global destructors. */ 655#undef ASM_OUTPUT_DESTRUCTOR 656#define ASM_OUTPUT_DESTRUCTOR(FILE, NAME) \ 657 do { \ 658 if (TARGET_ELF) \ 659 { \ 660 dtors_section (); \ 661 fprintf ((FILE), "%s ", INT_ASM_OP); \ 662 assemble_name ((FILE), (NAME)); \ 663 fprintf ((FILE), "\n"); \ 664 } \ 665 else \ 666 { \ 667 fprintf (asm_out_file, "%s \"%s__DTOR_LIST__\",22,0,0,", \ 668 ASM_STABS_OP, (TARGET_UNDERSCORES) ? "_" : ""); \ 669 assemble_name (asm_out_file, name); \ 670 fputc ('\n', asm_out_file); \ 671 } \ 672 } while (0) 673 674/* Define macro used to output shift-double opcodes when the shift 675 count is in %cl. Some assemblers require %cl as an argument; 676 some don't. 677 678 *OLD* GAS requires the %cl argument, so override i386/unix.h. */ 679 680#undef AS3_SHIFT_DOUBLE 681#define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d) 682 683 684/************************[ Debugger stuff ]*********************************/ 685 686/* The a.out tools do not support "Lscope" .stabs symbols. */ 687#undef NO_DBX_FUNCTION_END 688#define NO_DBX_FUNCTION_END TARGET_AOUT 689 690/* In ELF, the function stabs come first, before the relative offsets. */ 691#undef DBX_FUNCTION_FIRST 692#define DBX_CHECK_FUNCTION_FIRST TARGET_ELF 693 694/* Copy this from the svr4 specifications... */ 695/* Define the register numbers to be used in Dwarf debugging information. 696 The SVR4 reference port C compiler uses the following register numbers 697 in its Dwarf output code: 698 0 for %eax (gnu regno = 0) 699 1 for %ecx (gnu regno = 2) 700 2 for %edx (gnu regno = 1) 701 3 for %ebx (gnu regno = 3) 702 4 for %esp (gnu regno = 7) 703 5 for %ebp (gnu regno = 6) 704 6 for %esi (gnu regno = 4) 705 7 for %edi (gnu regno = 5) 706 The following three DWARF register numbers are never generated by 707 the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4 708 believes these numbers have these meanings. 709 8 for %eip (no gnu equivalent) 710 9 for %eflags (no gnu equivalent) 711 10 for %trapno (no gnu equivalent) 712 It is not at all clear how we should number the FP stack registers 713 for the x86 architecture. If the version of SDB on x86/svr4 were 714 a bit less brain dead with respect to floating-point then we would 715 have a precedent to follow with respect to DWARF register numbers 716 for x86 FP registers, but the SDB on x86/svr4 is so completely 717 broken with respect to FP registers that it is hardly worth thinking 718 of it as something to strive for compatibility with. 719 The version of x86/svr4 SDB I have at the moment does (partially) 720 seem to believe that DWARF register number 11 is associated with 721 the x86 register %st(0), but that's about all. Higher DWARF 722 register numbers don't seem to be associated with anything in 723 particular, and even for DWARF regno 11, SDB only seems to under- 724 stand that it should say that a variable lives in %st(0) (when 725 asked via an `=' command) if we said it was in DWARF regno 11, 726 but SDB still prints garbage when asked for the value of the 727 variable in question (via a `/' command). 728 (Also note that the labels SDB prints for various FP stack regs 729 when doing an `x' command are all wrong.) 730 Note that these problems generally don't affect the native SVR4 731 C compiler because it doesn't allow the use of -O with -g and 732 because when it is *not* optimizing, it allocates a memory 733 location for each floating-point variable, and the memory 734 location is what gets described in the DWARF AT_location 735 attribute for the variable in question. 736 Regardless of the severe mental illness of the x86/svr4 SDB, we 737 do something sensible here and we use the following DWARF 738 register numbers. Note that these are all stack-top-relative 739 numbers. 740 11 for %st(0) (gnu regno = 8) 741 12 for %st(1) (gnu regno = 9) 742 13 for %st(2) (gnu regno = 10) 743 14 for %st(3) (gnu regno = 11) 744 15 for %st(4) (gnu regno = 12) 745 16 for %st(5) (gnu regno = 13) 746 17 for %st(6) (gnu regno = 14) 747 18 for %st(7) (gnu regno = 15) 748*/ 749#undef DWARF_DBX_REGISTER_NUMBER 750#define DWARF_DBX_REGISTER_NUMBER(n) \ 751((n) == 0 ? 0 \ 752 : (n) == 1 ? 2 \ 753 : (n) == 2 ? 1 \ 754 : (n) == 3 ? 3 \ 755 : (n) == 4 ? 6 \ 756 : (n) == 5 ? 7 \ 757 : (n) == 6 ? 5 \ 758 : (n) == 7 ? 4 \ 759 : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \ 760 : (-1)) 761 762/* Now what stabs expects in the register. */ 763#undef STABS_DBX_REGISTER_NUMBER 764#define STABS_DBX_REGISTER_NUMBER(n) \ 765((n) == 0 ? 0 : \ 766 (n) == 1 ? 2 : \ 767 (n) == 2 ? 1 : \ 768 (n) == 3 ? 3 : \ 769 (n) == 4 ? 6 : \ 770 (n) == 5 ? 7 : \ 771 (n) == 6 ? 4 : \ 772 (n) == 7 ? 5 : \ 773 (n) + 4) 774 775#undef DBX_REGISTER_NUMBER 776#define DBX_REGISTER_NUMBER(n) ((write_symbols == DWARF2_DEBUG \ 777 || write_symbols == DWARF_DEBUG) \ 778 ? DWARF_DBX_REGISTER_NUMBER(n) \ 779 : STABS_DBX_REGISTER_NUMBER(n)) 780 781/* tag end of file in elf mode */ 782#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END 783#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 784 do { \ 785 if (TARGET_ELF) { \ 786 fprintf ((FILE), "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", \ 787 N_SO); \ 788 } \ 789 } while (0) 790 791/* stabs-in-elf has offsets relative to function beginning */ 792#undef DBX_OUTPUT_LBRAC 793#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 794 do { \ 795 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 796 assemble_name (asmfile, buf); \ 797 if (TARGET_ELF) \ 798 { \ 799 fputc ('-', asmfile); \ 800 assemble_name (asmfile, \ 801 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 802 } \ 803 fprintf (asmfile, "\n"); \ 804 } while (0) 805 806#undef DBX_OUTPUT_RBRAC 807#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 808 do { \ 809 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 810 assemble_name (asmfile, buf); \ 811 if (TARGET_ELF) \ 812 { \ 813 fputc ('-', asmfile); \ 814 assemble_name (asmfile, \ 815 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 816 } \ 817 fprintf (asmfile, "\n"); \ 818 } while (0) 819