freebsd.h revision 91221
1/* Definitions for Intel 386 running FreeBSD with either a.out or ELF format 2 Copyright (C) 1996-2000 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 91221 2002-02-25 04:49:17Z 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 I took out %{v:%{!V:-V}}. It is too much :-(. They can use 53 -Wl,-V. 54 55 When the -shared link option is used a final link is not being 56 done. */ 57 58#undef LINK_SPEC 59#define LINK_SPEC "\ 60 %{p:%e`-p' not supported; use `-pg' and gprof(1)} \ 61 %{maout: %{shared:-Bshareable} \ 62 %{!shared:%{!nostdlib:%{!r:%{!e*:-e start}}} -dc -dp %{static:-Bstatic} \ 63 %{pg:-Bstatic} %{Z}} \ 64 %{assert*} %{R*}} \ 65 %{!maout: \ 66 %{Wl,*:%*} \ 67 %{assert*} %{R*} %{rpath*} %{defsym*} \ 68 %{shared:-Bshareable %{h*} %{soname*}} \ 69 %{symbolic:-Bsymbolic} \ 70 %{!shared: \ 71 %{!static: \ 72 %{rdynamic: -export-dynamic} \ 73 %{!dynamic-linker: -dynamic-linker /usr/libexec/ld-elf.so.1}} \ 74 %{static:-Bstatic}}}" 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 %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}}" 90 91/* Provide an ENDFILE_SPEC appropriate for FreeBSD/i386. Here we tack on our 92 own magical crtend.o file (compare w/crtstuff.c) which provides part of the 93 support for getting C++ file-scope static object constructed before 94 entering `main', followed by the normal "finalizer" file, `crtn.o'. */ 95 96#undef ENDFILE_SPEC 97#define ENDFILE_SPEC "\ 98 %{!maout: \ 99 %{!shared:crtend.o%s} \ 100 %{shared:crtendS.o%s} crtn.o%s}" 101 102 103/************************[ Target stuff ]***********************************/ 104 105/* Define the actual types of some ANSI-mandated types. 106 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 107 c-common.c, and config/<arch>/<arch>.h. */ 108 109#undef SIZE_TYPE 110#define SIZE_TYPE "unsigned int" 111 112#undef PTRDIFF_TYPE 113#define PTRDIFF_TYPE "int" 114 115/* This is the pseudo-op used to generate a 32-bit word of data with a 116 specific value in some section. */ 117 118#undef INT_ASM_OP 119#define INT_ASM_OP ".long" 120 121/* Biggest alignment supported by the object file format of this 122 machine. Use this macro to limit the alignment which can be 123 specified using the `__attribute__ ((aligned (N)))' construct. If 124 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 125 126#define MAX_OFILE_ALIGNMENT (32768*8) 127 128#undef TARGET_VERSION 129#define TARGET_VERSION fprintf (stderr, " (i386 FreeBSD/ELF)"); 130 131#define MASK_PROFILER_EPILOGUE 010000000000 132#define MASK_AOUT 004000000000 /* a.out not elf */ 133#define MASK_UNDERSCORES 002000000000 /* use leading _ */ 134 135#define TARGET_PROFILER_EPILOGUE (target_flags & MASK_PROFILER_EPILOGUE) 136#define TARGET_AOUT (target_flags & MASK_AOUT) 137#define TARGET_ELF ((target_flags & MASK_AOUT) == 0) 138#define TARGET_UNDERSCORES ((target_flags & MASK_UNDERSCORES) != 0) 139 140#undef SUBTARGET_SWITCHES 141#define SUBTARGET_SWITCHES \ 142 { "profiler-epilogue", MASK_PROFILER_EPILOGUE, "Function profiler epilogue"}, \ 143 { "no-profiler-epilogue", -MASK_PROFILER_EPILOGUE, "No function profiler epilogue"}, \ 144 { "aout", MASK_AOUT, "Generate an a.out (vs. ELF) binary"}, \ 145 { "no-aout", -MASK_AOUT, "Do not generate an a.out binary"}, \ 146 { "underscores", MASK_UNDERSCORES, "Add leading underscores to symbols"}, \ 147 { "no-underscores", -MASK_UNDERSCORES, "Do not add leading underscores to symbols"}, 148 149/* This goes away when the math emulator is fixed. */ 150#undef TARGET_DEFAULT 151#define TARGET_DEFAULT \ 152 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_NO_FANCY_MATH_387) 153 154/* Prefix for internally generated assembler labels. If we aren't using 155 underscores, we are using prefix `.'s to identify labels that should 156 be ignored, as in `i386/gas.h' --karl@cs.umb.edu */ 157#undef LPREFIX 158#define LPREFIX ((TARGET_UNDERSCORES) ? "L" : ".L") 159 160/* The a.out tools do not support "linkonce" sections. */ 161#undef SUPPORTS_ONE_ONLY 162#define SUPPORTS_ONE_ONLY TARGET_ELF 163 164/* Enable alias attribute support. */ 165#undef SET_ASM_OP 166#define SET_ASM_OP ".set" 167 168/* The a.out tools do not support "Lscope" .stabs symbols. */ 169#undef NO_DBX_FUNCTION_END 170#define NO_DBX_FUNCTION_END TARGET_AOUT 171 172/* In ELF, the function stabs come first, before the relative offsets. */ 173#undef DBX_FUNCTION_FIRST 174#define DBX_CHECK_FUNCTION_FIRST TARGET_ELF 175 176/* supply our own hook for calling __main() from main() */ 177#undef INVOKE__main 178#define INVOKE__main 179#undef GEN_CALL__MAIN 180#define GEN_CALL__MAIN \ 181 do { \ 182 if (!(TARGET_ELF)) \ 183 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, NAME__MAIN), 0, \ 184 VOIDmode, 0); \ 185 } while (0) 186 187/* Indicate that jump tables go in the text section. This is 188 necessary when compiling PIC code. */ 189#undef JUMP_TABLES_IN_TEXT_SECTION 190#define JUMP_TABLES_IN_TEXT_SECTION (flag_pic) 191 192/* override the exception table positioning */ 193#undef EXCEPTION_SECTION 194#define EXCEPTION_SECTION() \ 195 do { \ 196 if (TARGET_ELF) \ 197 { \ 198 named_section (NULL_TREE, ".gcc_except_table", 0); \ 199 } \ 200 else \ 201 { \ 202 if (flag_pic) \ 203 data_section (); \ 204 else \ 205 readonly_data_section (); \ 206 } \ 207 } while (0); 208 209/* Tell final.c that we don't need a label passed to mcount. */ 210#undef NO_PROFILE_COUNTERS 211#define NO_PROFILE_COUNTERS 212 213/* Output assembler code to FILE to begin profiling of the current function. 214 LABELNO is an optional label. */ 215 216#undef FUNCTION_PROFILER 217#define FUNCTION_PROFILER(FILE, LABELNO) \ 218 do { \ 219 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 220 if (flag_pic) \ 221 fprintf ((FILE), "\tcall *%s@GOT(%%ebx)\n", _name); \ 222 else \ 223 fprintf ((FILE), "\tcall %s\n", _name); \ 224 } while (0) 225 226/* Output assembler code to FILE to end profiling of the current function. */ 227 228#undef FUNCTION_PROFILER_EPILOGUE 229#define FUNCTION_PROFILER_EPILOGUE(FILE, DO_RTL) \ 230 do { \ 231 if (TARGET_PROFILER_EPILOGUE) \ 232 { \ 233 if (DO_RTL) \ 234 { \ 235 /* ".mexitcount" is specially handled in \ 236 ASM_HACK_SYMBOLREF () so that we don't need to handle \ 237 flag_pic or TARGET_AOUT here. */ \ 238 rtx xop; \ 239 xop = gen_rtx_MEM (FUNCTION_MODE, \ 240 gen_rtx_SYMBOL_REF (Pmode, ".mexitcount")); \ 241 emit_call_insn (gen_rtx (CALL, VOIDmode, xop, const0_rtx)); \ 242 } \ 243 else \ 244 { \ 245 /* XXX this !DO_RTL case is broken but not actually used. */ \ 246 char *_name = TARGET_AOUT ? "mcount" : ".mcount"; \ 247 if (flag_pic) \ 248 fprintf (FILE, "\tcall *%s@GOT(%%ebx)\n", _name); \ 249 else \ 250 fprintf (FILE, "\tcall %s\n", _name); \ 251 } \ 252 } \ 253 } while (0) 254 255 256/************************[ Assembler stuff ]********************************/ 257 258#undef ASM_APP_ON 259#define ASM_APP_ON "#APP\n" 260 261#undef ASM_APP_OFF 262#define ASM_APP_OFF "#NO_APP\n" 263 264/* This is how to begin an assembly language file. 265 The .file command should always begin the output. 266 ELF also needs a .version. */ 267 268#undef ASM_FILE_START 269#define ASM_FILE_START(FILE) \ 270 do { \ 271 output_file_directive ((FILE), main_input_filename); \ 272 if (TARGET_ELF) \ 273 fprintf ((FILE), "\t.version\t\"01.01\"\n"); \ 274 } while (0) 275 276/* This is how to store into the string BUF 277 the symbol_ref name of an internal numbered label where 278 PREFIX is the class of label and NUM is the number within the class. 279 This is suitable for output with `assemble_name'. */ 280#undef ASM_GENERATE_INTERNAL_LABEL 281#define ASM_GENERATE_INTERNAL_LABEL(BUF, PREFIX, NUMBER) \ 282 sprintf ((BUF), "*%s%s%d", (TARGET_UNDERSCORES) ? "" : ".", \ 283 (PREFIX), (NUMBER)) 284 285/* This is how to output an internal numbered label where 286 PREFIX is the class of label and NUM is the number within the class. 287 For most svr4/ELF systems, the convention is that any symbol which begins 288 with a period is not put into the linker symbol table by the assembler. */ 289#undef ASM_OUTPUT_INTERNAL_LABEL 290#define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \ 291 fprintf ((FILE), "%s%s%d:\n", (TARGET_UNDERSCORES) ? "" : ".", \ 292 (PREFIX), (NUM)) 293 294/* This is how to output a reference to a user-level label named NAME. */ 295#undef ASM_OUTPUT_LABELREF 296#define ASM_OUTPUT_LABELREF(FILE, NAME) \ 297 do { \ 298 char *_name = (NAME); \ 299 /* Hack to avoid writing lots of rtl in \ 300 FUNCTION_PROFILER_EPILOGUE (). */ \ 301 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 302 { \ 303 if (TARGET_AOUT) \ 304 _name++; \ 305 if (flag_pic) \ 306 fprintf ((FILE), "*%s@GOT(%%ebx)", _name); \ 307 else \ 308 fprintf ((FILE), "%s", _name); \ 309 } \ 310 else \ 311 fprintf (FILE, "%s%s", TARGET_UNDERSCORES ? "_" : "", _name); \ 312} while (0) 313 314/* This is how to hack on the symbol code of certain relcalcitrant 315 symbols to modify their output in output_pic_addr_const (). */ 316 317#undef ASM_HACK_SYMBOLREF_CODE 318#define ASM_HACK_SYMBOLREF_CODE(NAME, CODE) \ 319 do { \ 320 /* Part of hack to avoid writing lots of rtl in \ 321 FUNCTION_PROFILER_EPILOGUE (). */ \ 322 char *_name = (NAME); \ 323 if (*_name == '.' && strcmp(_name + 1, "mexitcount") == 0) \ 324 (CODE) = 'X'; \ 325 } while (0) 326 327/* This is how to output an element of a case-vector that is relative. 328 This is only used for PIC code. See comments by the `casesi' insn in 329 i386.md for an explanation of the expression this outputs. */ 330#undef ASM_OUTPUT_ADDR_DIFF_ELT 331#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, BODY, VALUE, REL) \ 332 fprintf ((FILE), "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, (VALUE)) 333 334#undef ASM_OUTPUT_ALIGN 335#define ASM_OUTPUT_ALIGN(FILE, LOG) \ 336 if ((LOG)!=0) { \ 337 if (in_text_section()) \ 338 fprintf ((FILE), "\t.p2align %d,0x90\n", (LOG)); \ 339 else \ 340 fprintf ((FILE), "\t.p2align %d\n", (LOG)); \ 341 } 342 343#undef ASM_OUTPUT_ALIGNED_COMMON 344#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 345 do { \ 346 if (TARGET_ELF) \ 347 { \ 348 fprintf ((FILE), "%s", COMMON_ASM_OP); \ 349 assemble_name ((FILE), (NAME)); \ 350 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 351 } \ 352 else \ 353 { \ 354 int rounded = (SIZE); \ 355 if (rounded == 0) rounded = 1; \ 356 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 357 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 358 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 359 fprintf ((FILE), "%s ", COMMON_ASM_OP); \ 360 assemble_name ((FILE), (NAME)); \ 361 fprintf ((FILE), ",%u\n", (rounded)); \ 362 } \ 363 } while (0) 364 365/* This says how to output assembler code to declare an 366 uninitialized internal linkage data object. Under SVR4, 367 the linker seems to want the alignment of data objects 368 to depend on their types. We do exactly that here. */ 369 370#undef ASM_OUTPUT_ALIGNED_LOCAL 371#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 372 do { \ 373 if (TARGET_ELF) \ 374 { \ 375 fprintf ((FILE), "%s", LOCAL_ASM_OP); \ 376 assemble_name ((FILE), (NAME)); \ 377 fprintf ((FILE), "\n"); \ 378 ASM_OUTPUT_ALIGNED_COMMON ((FILE), (NAME), (SIZE), (ALIGN)); \ 379 } \ 380 else \ 381 { \ 382 int rounded = (SIZE); \ 383 if (rounded == 0) rounded = 1; \ 384 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1; \ 385 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT) \ 386 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT)); \ 387 fputs ("\t.lcomm\t", (FILE)); \ 388 assemble_name ((FILE), (NAME)); \ 389 fprintf ((FILE), ",%u\n", (rounded)); \ 390 } \ 391 } while (0) 392 393/* How to output some space. The rules are different depending on the 394 object format. */ 395#undef ASM_OUTPUT_SKIP 396#define ASM_OUTPUT_SKIP(FILE, SIZE) \ 397 do { \ 398 if (TARGET_ELF) \ 399 { \ 400 fprintf ((FILE), "%s%u\n", SKIP_ASM_OP, (SIZE)); \ 401 } \ 402 else \ 403 { \ 404 fprintf ((FILE), "\t.space\t%u\n", (SIZE)); \ 405 } \ 406 } while (0) 407 408 409#undef ASM_OUTPUT_SOURCE_LINE 410#define ASM_OUTPUT_SOURCE_LINE(FILE, LINE) \ 411 do { \ 412 static int sym_lineno = 1; \ 413 if (TARGET_ELF) \ 414 { \ 415 fprintf ((FILE), ".stabn 68,0,%d,.LM%d-", (LINE), sym_lineno); \ 416 assemble_name ((FILE), \ 417 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 418 fprintf ((FILE), "\n.LM%d:\n", sym_lineno); \ 419 sym_lineno += 1; \ 420 } \ 421 else \ 422 { \ 423 fprintf ((FILE), "\t%s %d,0,%d\n", ASM_STABD_OP, N_SLINE, \ 424 lineno); \ 425 } \ 426 } while (0) 427 428/* These macros generate the special .type and .size directives which 429 are used to set the corresponding fields of the linker symbol table 430 entries in an ELF object file under SVR4. These macros also output 431 the starting labels for the relevant functions/objects. */ 432 433/* Write the extra assembler code needed to declare a function properly. 434 Some svr4 assemblers need to also have something extra said about the 435 function's return value. We allow for that here. */ 436 437#undef ASM_DECLARE_FUNCTION_NAME 438#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 439 do { \ 440 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \ 441 assemble_name (FILE, NAME); \ 442 putc (',', FILE); \ 443 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \ 444 putc ('\n', FILE); \ 445 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 446 ASM_OUTPUT_LABEL(FILE, NAME); \ 447 } while (0) 448 449/* This is how to declare the size of a function. */ 450 451#undef ASM_DECLARE_FUNCTION_SIZE 452#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 453 do { \ 454 if (!flag_inhibit_size_directive) \ 455 { \ 456 char label[256]; \ 457 static int labelno; \ 458 labelno++; \ 459 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \ 460 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \ 461 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ 462 assemble_name (FILE, (FNAME)); \ 463 fprintf (FILE, ","); \ 464 assemble_name (FILE, label); \ 465 fprintf (FILE, "-"); \ 466 assemble_name (FILE, (FNAME)); \ 467 putc ('\n', FILE); \ 468 } \ 469 } while (0) 470 471 472/* The routine used to output NUL terminated strings. We use a special 473 version of this for most svr4 targets because doing so makes the 474 generated assembly code more compact (and thus faster to assemble) 475 as well as more readable, especially for targets like the i386 476 (where the only alternative is to output character sequences as 477 comma separated lists of numbers). */ 478 479#undef ASM_OUTPUT_LIMITED_STRING 480#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \ 481 do { \ 482 register unsigned char *_limited_str = (unsigned char *) (STR); \ 483 register unsigned ch; \ 484 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \ 485 for (; (ch = *_limited_str); _limited_str++) \ 486 { \ 487 register int escape; \ 488 switch (escape = ESCAPES[ch]) \ 489 { \ 490 case 0: \ 491 putc (ch, (FILE)); \ 492 break; \ 493 case 1: \ 494 fprintf ((FILE), "\\%03o", ch); \ 495 break; \ 496 default: \ 497 putc ('\\', (FILE)); \ 498 putc (escape, (FILE)); \ 499 break; \ 500 } \ 501 } \ 502 fprintf ((FILE), "\"\n"); \ 503 } while (0) 504 505/* Switch into a generic section. 506 507 We make the section read-only and executable for a function decl, 508 read-only for a const data decl, and writable for a non-const data decl. 509 510 If the section has already been defined, we must not 511 emit the attributes here. The SVR4 assembler does not 512 recognize section redefinitions. 513 If DECL is NULL, no attributes are emitted. */ 514 515#undef ASM_OUTPUT_SECTION_NAME 516#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \ 517 do { \ 518 static struct section_info \ 519 { \ 520 struct section_info *next; \ 521 char *name; \ 522 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \ 523 } *sections; \ 524 struct section_info *s; \ 525 char *mode; \ 526 enum sect_enum type; \ 527 \ 528 for (s = sections; s; s = s->next) \ 529 if (!strcmp (NAME, s->name)) \ 530 break; \ 531 \ 532 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \ 533 type = SECT_EXEC, mode = "ax"; \ 534 else if (DECL && DECL_READONLY_SECTION (DECL, RELOC)) \ 535 type = SECT_RO, mode = "a"; \ 536 else \ 537 type = SECT_RW, mode = "aw"; \ 538 \ 539 if (s == 0) \ 540 { \ 541 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \ 542 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \ 543 strcpy (s->name, NAME); \ 544 s->type = type; \ 545 s->next = sections; \ 546 sections = s; \ 547 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \ 548 } \ 549 else \ 550 { \ 551 if (DECL && s->type != type) \ 552 error_with_decl (DECL, "%s causes a section type conflict"); \ 553 \ 554 fprintf (FILE, ".section\t%s\n", NAME); \ 555 } \ 556 } while (0) 557 558#undef MAKE_DECL_ONE_ONLY 559#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 560#undef UNIQUE_SECTION_P 561#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL)) 562#undef UNIQUE_SECTION 563#define UNIQUE_SECTION(DECL,RELOC) \ 564 do { \ 565 int len; \ 566 char *name, *string, *prefix; \ 567 \ 568 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ 569 \ 570 if (! DECL_ONE_ONLY (DECL)) \ 571 { \ 572 prefix = "."; \ 573 if (TREE_CODE (DECL) == FUNCTION_DECL) \ 574 prefix = ".text."; \ 575 else if (DECL_READONLY_SECTION (DECL, RELOC)) \ 576 prefix = ".rodata."; \ 577 else \ 578 prefix = ".data."; \ 579 } \ 580 else if (TREE_CODE (DECL) == FUNCTION_DECL) \ 581 prefix = ".gnu.linkonce.t."; \ 582 else if (DECL_READONLY_SECTION (DECL, RELOC)) \ 583 prefix = ".gnu.linkonce.r."; \ 584 else \ 585 prefix = ".gnu.linkonce.d."; \ 586 \ 587 len = strlen (name) + strlen (prefix); \ 588 string = alloca (len + 1); \ 589 sprintf (string, "%s%s", prefix, name); \ 590 \ 591 DECL_SECTION_NAME (DECL) = build_string (len, string); \ 592 } while (0) 593 594/* A C statement or statements to switch to the appropriate 595 section for output of DECL. DECL is either a `VAR_DECL' node 596 or a constant of some sort. RELOC indicates whether forming 597 the initial value of DECL requires link-time relocations. */ 598 599#undef SELECT_SECTION 600#define SELECT_SECTION(DECL,RELOC) \ 601 { \ 602 if (flag_pic && RELOC) \ 603 data_section (); \ 604 else if (TREE_CODE (DECL) == STRING_CST) \ 605 { \ 606 if (! flag_writable_strings) \ 607 const_section (); \ 608 else \ 609 data_section (); \ 610 } \ 611 else if (TREE_CODE (DECL) == VAR_DECL) \ 612 { \ 613 if (! DECL_READONLY_SECTION (DECL, RELOC)) \ 614 data_section (); \ 615 else \ 616 const_section (); \ 617 } \ 618 else \ 619 const_section (); \ 620 } 621 622/* A C statement (sans semicolon) to output an element in the table of 623 global constructors. */ 624#undef ASM_OUTPUT_CONSTRUCTOR 625#define ASM_OUTPUT_CONSTRUCTOR(FILE, NAME) \ 626 do { \ 627 if (TARGET_ELF) \ 628 { \ 629 ctors_section (); \ 630 fprintf ((FILE), "%s ", INT_ASM_OP); \ 631 assemble_name ((FILE), (NAME)); \ 632 fprintf ((FILE), "\n"); \ 633 } \ 634 else \ 635 { \ 636 fprintf (asm_out_file, "%s \"%s__CTOR_LIST__\",22,0,0,", \ 637 ASM_STABS_OP, (TARGET_UNDERSCORES) ? "_" : ""); \ 638 assemble_name (asm_out_file, name); \ 639 fputc ('\n', asm_out_file); \ 640 } \ 641 } while (0) 642 643/* A C statement (sans semicolon) to output an element in the table of 644 global destructors. */ 645#undef ASM_OUTPUT_DESTRUCTOR 646#define ASM_OUTPUT_DESTRUCTOR(FILE, NAME) \ 647 do { \ 648 if (TARGET_ELF) \ 649 { \ 650 dtors_section (); \ 651 fprintf ((FILE), "%s ", INT_ASM_OP); \ 652 assemble_name ((FILE), (NAME)); \ 653 fprintf ((FILE), "\n"); \ 654 } \ 655 else \ 656 { \ 657 fprintf (asm_out_file, "%s \"%s__DTOR_LIST__\",22,0,0,", \ 658 ASM_STABS_OP, (TARGET_UNDERSCORES) ? "_" : ""); \ 659 assemble_name (asm_out_file, name); \ 660 fputc ('\n', asm_out_file); \ 661 } \ 662 } while (0) 663 664/* Define macro used to output shift-double opcodes when the shift 665 count is in %cl. Some assemblers require %cl as an argument; 666 some don't. 667 668 *OLD* GAS requires the %cl argument, so override i386/unix.h. */ 669 670#undef AS3_SHIFT_DOUBLE 671#define AS3_SHIFT_DOUBLE(a,b,c,d) AS3 (a,b,c,d) 672 673 674/************************[ Debugger stuff ]*********************************/ 675 676/* Copy this from the svr4 specifications... */ 677/* Define the register numbers to be used in Dwarf debugging information. 678 The SVR4 reference port C compiler uses the following register numbers 679 in its Dwarf output code: 680 0 for %eax (gnu regno = 0) 681 1 for %ecx (gnu regno = 2) 682 2 for %edx (gnu regno = 1) 683 3 for %ebx (gnu regno = 3) 684 4 for %esp (gnu regno = 7) 685 5 for %ebp (gnu regno = 6) 686 6 for %esi (gnu regno = 4) 687 7 for %edi (gnu regno = 5) 688 The following three DWARF register numbers are never generated by 689 the SVR4 C compiler or by the GNU compilers, but SDB on x86/svr4 690 believes these numbers have these meanings. 691 8 for %eip (no gnu equivalent) 692 9 for %eflags (no gnu equivalent) 693 10 for %trapno (no gnu equivalent) 694 It is not at all clear how we should number the FP stack registers 695 for the x86 architecture. If the version of SDB on x86/svr4 were 696 a bit less brain dead with respect to floating-point then we would 697 have a precedent to follow with respect to DWARF register numbers 698 for x86 FP registers, but the SDB on x86/svr4 is so completely 699 broken with respect to FP registers that it is hardly worth thinking 700 of it as something to strive for compatibility with. 701 The version of x86/svr4 SDB I have at the moment does (partially) 702 seem to believe that DWARF register number 11 is associated with 703 the x86 register %st(0), but that's about all. Higher DWARF 704 register numbers don't seem to be associated with anything in 705 particular, and even for DWARF regno 11, SDB only seems to under- 706 stand that it should say that a variable lives in %st(0) (when 707 asked via an `=' command) if we said it was in DWARF regno 11, 708 but SDB still prints garbage when asked for the value of the 709 variable in question (via a `/' command). 710 (Also note that the labels SDB prints for various FP stack regs 711 when doing an `x' command are all wrong.) 712 Note that these problems generally don't affect the native SVR4 713 C compiler because it doesn't allow the use of -O with -g and 714 because when it is *not* optimizing, it allocates a memory 715 location for each floating-point variable, and the memory 716 location is what gets described in the DWARF AT_location 717 attribute for the variable in question. 718 Regardless of the severe mental illness of the x86/svr4 SDB, we 719 do something sensible here and we use the following DWARF 720 register numbers. Note that these are all stack-top-relative 721 numbers. 722 11 for %st(0) (gnu regno = 8) 723 12 for %st(1) (gnu regno = 9) 724 13 for %st(2) (gnu regno = 10) 725 14 for %st(3) (gnu regno = 11) 726 15 for %st(4) (gnu regno = 12) 727 16 for %st(5) (gnu regno = 13) 728 17 for %st(6) (gnu regno = 14) 729 18 for %st(7) (gnu regno = 15) 730*/ 731#undef DWARF_DBX_REGISTER_NUMBER 732#define DWARF_DBX_REGISTER_NUMBER(n) \ 733((n) == 0 ? 0 \ 734 : (n) == 1 ? 2 \ 735 : (n) == 2 ? 1 \ 736 : (n) == 3 ? 3 \ 737 : (n) == 4 ? 6 \ 738 : (n) == 5 ? 7 \ 739 : (n) == 6 ? 5 \ 740 : (n) == 7 ? 4 \ 741 : ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG) ? (n)+3 \ 742 : (-1)) 743 744/* Now what stabs expects in the register. */ 745#undef STABS_DBX_REGISTER_NUMBER 746#define STABS_DBX_REGISTER_NUMBER(n) \ 747((n) == 0 ? 0 : \ 748 (n) == 1 ? 2 : \ 749 (n) == 2 ? 1 : \ 750 (n) == 3 ? 3 : \ 751 (n) == 4 ? 6 : \ 752 (n) == 5 ? 7 : \ 753 (n) == 6 ? 4 : \ 754 (n) == 7 ? 5 : \ 755 (n) + 4) 756 757#undef DBX_REGISTER_NUMBER 758#define DBX_REGISTER_NUMBER(n) ((write_symbols == DWARF_DEBUG) \ 759 ? DWARF_DBX_REGISTER_NUMBER(n) \ 760 : STABS_DBX_REGISTER_NUMBER(n)) 761 762/* tag end of file in elf mode */ 763#undef DBX_OUTPUT_MAIN_SOURCE_FILE_END 764#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 765 do { \ 766 if (TARGET_ELF) { \ 767 fprintf ((FILE), "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", \ 768 N_SO); \ 769 } \ 770 } while (0) 771 772/* stabs-in-elf has offsets relative to function beginning */ 773#undef DBX_OUTPUT_LBRAC 774#define DBX_OUTPUT_LBRAC(FILE, NAME) \ 775 do { \ 776 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_LBRAC); \ 777 assemble_name (asmfile, buf); \ 778 if (TARGET_ELF) \ 779 { \ 780 fputc ('-', asmfile); \ 781 assemble_name (asmfile, \ 782 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 783 } \ 784 fprintf (asmfile, "\n"); \ 785 } while (0) 786 787#undef DBX_OUTPUT_RBRAC 788#define DBX_OUTPUT_RBRAC(FILE, NAME) \ 789 do { \ 790 fprintf (asmfile, "%s %d,0,0,", ASM_STABN_OP, N_RBRAC); \ 791 assemble_name (asmfile, buf); \ 792 if (TARGET_ELF) \ 793 { \ 794 fputc ('-', asmfile); \ 795 assemble_name (asmfile, \ 796 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0)); \ 797 } \ 798 fprintf (asmfile, "\n"); \ 799 } while (0) 800