gcc/config/elfos.h

   1 /* elfos.h  --  operating system specific defines to be used when
   2    targeting GCC for some generic ELF system
   3    Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001
   4    Free Software Foundation, Inc.
   5    Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24
  25 /* Define a symbol indicating that we are using elfos.h.
  26    Some CPU specific configuration files use this.  */
  27 #define USING_ELFOS_H
  28
  29 /* The prefix to add to user-visible assembler symbols.
  30
  31    For ELF systems the convention is *not* to prepend a leading
  32    underscore onto user-level symbol names.  */
  33
  34 #undef  USER_LABEL_PREFIX
  35 #define USER_LABEL_PREFIX ""
  36
  37 /* Biggest alignment supported by the object file format of this
  38    machine.  Use this macro to limit the alignment which can be
  39    specified using the `__attribute__ ((aligned (N)))' construct.  If
  40    not defined, the default value is `BIGGEST_ALIGNMENT'.  */
  41 #ifndef MAX_OFILE_ALIGNMENT
  42 #define MAX_OFILE_ALIGNMENT (32768 * 8)
  43 #endif
  44
  45 /* Use periods rather than dollar signs in special g++ assembler names.  */
  46
  47 #define NO_DOLLAR_IN_LABEL
  48
  49 /* Writing `int' for a bitfield forces int alignment for the structure.  */
  50
  51 #define PCC_BITFIELD_TYPE_MATTERS 1
  52
  53 /* Implicit library calls should use memcpy, not bcopy, etc.  */
  54
  55 #define TARGET_MEM_FUNCTIONS
  56
  57 /* Handle #pragma weak and #pragma pack.  */
  58
  59 #define HANDLE_SYSV_PRAGMA
  60
  61 /* System V Release 4 uses DWARF debugging info.  */
  62
  63 #ifndef DWARF_DEBUGGING_INFO
  64 #define DWARF_DEBUGGING_INFO 1
  65 #endif
  66
  67 /* All ELF targets can support DWARF-2.  */
  68
  69 #ifndef DWARF2_DEBUGGING_INFO
  70 #define DWARF2_DEBUGGING_INFO 1
  71 #endif
  72
  73 /* The GNU tools operate better with stabs.  Since we don't have
  74    any native tools to be compatible with, default to stabs.  */
  75
  76 #ifndef PREFERRED_DEBUGGING_TYPE
  77 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
  78 #endif
  79
  80 /* All SVR4 targets use the ELF object file format.  */
  81 #define OBJECT_FORMAT_ELF
  82
  83
  84 /* Output #ident as a .ident.  */
  85
  86 #define ASM_OUTPUT_IDENT(FILE, NAME) \
  87   fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
  88
  89 #define IDENT_ASM_OP "\t.ident\t"
  90
  91 #undef  SET_ASM_OP
  92 #define SET_ASM_OP      "\t.set\t"
  93
  94 /* This is how to begin an assembly language file.  Most svr4 assemblers want
  95    at least a .file directive to come first, and some want to see a .version
  96    directive come right after that.  Here we just establish a default
  97    which generates only the .file directive.  If you need a .version
  98    directive for any specific target, you should override this definition
  99    in the target-specific file which includes this one.  */
 100
 101 #undef ASM_FILE_START
 102 #define ASM_FILE_START(FILE)                            \
 103   output_file_directive ((FILE), main_input_filename)
 104
 105 /* This is how to allocate empty space in some section.  The .zero
 106    pseudo-op is used for this on most svr4 assemblers.  */
 107
 108 #define SKIP_ASM_OP     "\t.zero\t"
 109
 110 #undef  ASM_OUTPUT_SKIP
 111 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
 112   fprintf (FILE, "%s%u\n", SKIP_ASM_OP, (SIZE))
 113
 114 /* This is how to output an internal numbered label where
 115    PREFIX is the class of label and NUM is the number within the class.
 116
 117    For most svr4 systems, the convention is that any symbol which begins
 118    with a period is not put into the linker symbol table by the assembler.  */
 119
 120 #undef  ASM_OUTPUT_INTERNAL_LABEL
 121 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM)            \
 122   do                                                            \
 123     {                                                           \
 124       fprintf (FILE, ".%s%u:\n", PREFIX, (unsigned) (NUM));     \
 125     }                                                           \
 126   while (0)
 127
 128 /* This is how to store into the string LABEL
 129    the symbol_ref name of an internal numbered label where
 130    PREFIX is the class of label and NUM is the number within the class.
 131    This is suitable for output with `assemble_name'.
 132
 133    For most svr4 systems, the convention is that any symbol which begins
 134    with a period is not put into the linker symbol table by the assembler.  */
 135
 136 #undef  ASM_GENERATE_INTERNAL_LABEL
 137 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
 138   do                                                            \
 139     {                                                           \
 140       sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM));      \
 141     }                                                           \
 142   while (0)
 143
 144 /* Output the label which precedes a jumptable.  Note that for all svr4
 145    systems where we actually generate jumptables (which is to say every
 146    svr4 target except i386, where we use casesi instead) we put the jump-
 147    tables into the .rodata section and since other stuff could have been
 148    put into the .rodata section prior to any given jumptable, we have to
 149    make sure that the location counter for the .rodata section gets pro-
 150    perly re-aligned prior to the actual beginning of the jump table.  */
 151
 152 #undef ALIGN_ASM_OP
 153 #define ALIGN_ASM_OP "\t.align\t"
 154
 155 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
 156 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
 157   ASM_OUTPUT_ALIGN ((FILE), 2);
 158 #endif
 159
 160 #undef  ASM_OUTPUT_CASE_LABEL
 161 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
 162   do                                                                    \
 163     {                                                                   \
 164       ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE)       \
 165         ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM);                  \
 166     }                                                                   \
 167   while (0)
 168
 169 /* The standard SVR4 assembler seems to require that certain builtin
 170    library routines (e.g. .udiv) be explicitly declared as .globl
 171    in each assembly file where they are referenced.  */
 172
 173 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)  \
 174   ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
 175
 176 /* This says how to output assembler code to declare an
 177    uninitialized external linkage data object.  Under SVR4,
 178    the linker seems to want the alignment of data objects
 179    to depend on their types.  We do exactly that here.  */
 180
 181 #define COMMON_ASM_OP   "\t.comm\t"
 182
 183 #undef  ASM_OUTPUT_ALIGNED_COMMON
 184 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 185   do                                                                    \
 186     {                                                                   \
 187       fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
 188       assemble_name ((FILE), (NAME));                                   \
 189       fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT);    \
 190     }                                                                   \
 191   while (0)
 192
 193 /* This says how to output assembler code to declare an
 194    uninitialized internal linkage data object.  Under SVR4,
 195    the linker seems to want the alignment of data objects
 196    to depend on their types.  We do exactly that here.  */
 197
 198 #define LOCAL_ASM_OP    "\t.local\t"
 199
 200 #undef  ASM_OUTPUT_ALIGNED_LOCAL
 201 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
 202   do                                                            \
 203     {                                                           \
 204       fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
 205       assemble_name ((FILE), (NAME));                           \
 206       fprintf ((FILE), "\n");                                   \
 207       ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN);      \
 208     }                                                           \
 209   while (0)
 210
 211 /* This is the pseudo-op used to generate a contiguous sequence of byte
 212    values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
 213    AUTOMATICALLY APPENDED.  This is the same for most svr4 assemblers.  */
 214
 215 #undef  ASCII_DATA_ASM_OP
 216 #define ASCII_DATA_ASM_OP       "\t.ascii\t"
 217
 218 /* Support const sections and the ctors and dtors sections for g++.
 219    Note that there appears to be two different ways to support const
 220    sections at the moment.  You can either #define the symbol
 221    READONLY_DATA_SECTION (giving it some code which switches to the
 222    readonly data section) or else you can #define the symbols
 223    EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
 224    SELECT_RTX_SECTION.  We do both here just to be on the safe side.  */
 225
 226 #define USE_CONST_SECTION       1
 227
 228 #define CONST_SECTION_ASM_OP    "\t.section\t.rodata"
 229
 230 /* On svr4, we *do* have support for the .init and .fini sections, and we
 231    can put stuff in there to be executed before and after `main'.  We let
 232    crtstuff.c and other files know this by defining the following symbols.
 233    The definitions say how to change sections to the .init and .fini
 234    sections.  This is the same for all known svr4 assemblers.  */
 235
 236 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 237 #define FINI_SECTION_ASM_OP     "\t.section\t.fini"
 238
 239 #ifdef HAVE_GAS_SUBSECTION_ORDERING
 240
 241 #define ASM_SECTION_START_OP    "\t.subsection\t-1"
 242
 243 /* Output assembly directive to move to the beginning of current section.  */
 244 #define ASM_OUTPUT_SECTION_START(FILE)  \
 245   fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
 246
 247 #endif
 248
 249 /* A default list of other sections which we might be "in" at any given
 250    time.  For targets that use additional sections (e.g. .tdesc) you
 251    should override this definition in the target-specific file which
 252    includes this file.  */
 253
 254 #undef  EXTRA_SECTIONS
 255 #define EXTRA_SECTIONS in_const
 256
 257 /* A default list of extra section function definitions.  For targets
 258    that use additional sections (e.g. .tdesc) you should override this
 259    definition in the target-specific file which includes this file.  */
 260
 261 #undef  EXTRA_SECTION_FUNCTIONS
 262 #define EXTRA_SECTION_FUNCTIONS         \
 263   CONST_SECTION_FUNCTION
 264
 265 #define READONLY_DATA_SECTION() const_section ()
 266
 267 #define CONST_SECTION_FUNCTION                                  \
 268 void                                                            \
 269 const_section ()                                                \
 270 {                                                               \
 271   if (!USE_CONST_SECTION)                                       \
 272     text_section ();                                            \
 273   else if (in_section != in_const)                              \
 274     {                                                           \
 275       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);     \
 276       in_section = in_const;                                    \
 277     }                                                           \
 278 }
 279
 280 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
 281
 282 #define UNIQUE_SECTION(DECL, RELOC)                             \
 283   do                                                            \
 284     {                                                           \
 285       int len;                                                  \
 286       int sec;                                                  \
 287       const char *name;                                         \
 288       char *string;                                             \
 289       const char *prefix;                                       \
 290       static const char *const prefixes[4][2] =                 \
 291       {                                                         \
 292         { ".text.",   ".gnu.linkonce.t." },                     \
 293         { ".rodata.", ".gnu.linkonce.r." },                     \
 294         { ".data.",   ".gnu.linkonce.d." },                     \
 295         { ".bss.",    ".gnu.linkonce.b." }                      \
 296       };                                                        \
 297                                                                 \
 298       if (TREE_CODE (DECL) == FUNCTION_DECL)                    \
 299         sec = 0;                                                \
 300       else if (DECL_INITIAL (DECL) == 0                         \
 301                || DECL_INITIAL (DECL) == error_mark_node)       \
 302         sec =  3;                                               \
 303       else if (DECL_READONLY_SECTION (DECL, RELOC))             \
 304         sec = 1;                                                \
 305       else                                                      \
 306         sec = 2;                                                \
 307                                                                 \
 308       name   = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
 309       /* Strip off any encoding in name.  */                    \
 310       STRIP_NAME_ENCODING (name, name);                         \
 311       prefix = prefixes[sec][DECL_ONE_ONLY(DECL)];              \
 312       len    = strlen (name) + strlen (prefix);                 \
 313       string = alloca (len + 1);                                \
 314                                                                 \
 315       sprintf (string, "%s%s", prefix, name);                   \
 316                                                                 \
 317       DECL_SECTION_NAME (DECL) = build_string (len, string);    \
 318     }                                                           \
 319   while (0)
 320
 321 /* Switch into a generic section.  */
 322 #define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
 323
 324 /* A C statement or statements to switch to the appropriate
 325    section for output of RTX in mode MODE.  RTX is some kind
 326    of constant in RTL.  The argument MODE is redundant except
 327    in the case of a `const_int' rtx.
 328    If assembler supports SHF_MERGE sections, put it into
 329    a .rodata.cstN section where N is size of the constant,
 330    otherwise into const section.  */
 331
 332 #undef  SELECT_RTX_SECTION
 333 #define SELECT_RTX_SECTION(MODE, RTX, ALIGN)    \
 334   mergeable_constant_section ((MODE), (ALIGN), 0)
 335
 336 /* A C statement or statements to switch to the appropriate
 337    section for output of DECL.  DECL is either a `VAR_DECL' node
 338    or a constant of some sort.  RELOC indicates whether forming
 339    the initial value of DECL requires link-time relocations.
 340
 341    To optimize loading of shared programs, define following subsections
 342    of data section by attaching:
 343
 344    .rel
 345      Section with this string in name contains data that do have
 346      relocations, so they get grouped together and dynamic linker
 347      will visit fewer pages in memory.
 348    .ro
 349      Marks data read only otherwise.  This is useful with prelinking
 350      as most of relocations won't be dynamically linked and thus
 351      stay read only.
 352    .local
 353      Marks data containing relocations only to local objects.  These
 354      relocation will get fully resolved by prelinking.
 355  */
 356
 357 #undef SELECT_SECTION
 358 #define SELECT_SECTION(DECL, RELOC, ALIGN)                      \
 359 {                                                               \
 360   if (TREE_CODE (DECL) == STRING_CST)                           \
 361     {                                                           \
 362       if (! flag_writable_strings)                              \
 363         mergeable_string_section ((DECL), (ALIGN), 0);          \
 364       else                                                      \
 365         data_section ();                                        \
 366     }                                                           \
 367   else if (TREE_CODE (DECL) == VAR_DECL)                        \
 368     {                                                           \
 369       if (!TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)     \
 370           || !DECL_INITIAL (DECL)                               \
 371           || (DECL_INITIAL (DECL) != error_mark_node            \
 372               && !TREE_CONSTANT (DECL_INITIAL (DECL))))         \
 373         {                                                       \
 374           if (flag_pic && ((RELOC) & 2))                        \
 375             named_section (NULL_TREE, ".data.rel", RELOC);      \
 376           else if (flag_pic && (RELOC))                         \
 377             named_section (NULL_TREE, ".data.rel.local", RELOC);\
 378           else                                                  \
 379             data_section ();                                    \
 380         }                                                       \
 381       else if (flag_pic && ((RELOC) & 2))                       \
 382         named_section (NULL_TREE, ".data.rel.ro", RELOC);       \
 383       else if (flag_pic && (RELOC))                             \
 384         named_section (NULL_TREE, ".data.rel.ro.local", RELOC); \
 385       else if (flag_merge_constants < 2)                        \
 386         /* C and C++ don't allow different variables to share   \
 387            the same location.  -fmerge-all-constants allows     \
 388            even that (at the expense of not conforming).  */    \
 389         const_section ();                                       \
 390       else if (TREE_CODE (DECL_INITIAL (DECL)) == STRING_CST)   \
 391         mergeable_string_section (DECL_INITIAL (DECL), (ALIGN), \
 392                                   0);                           \
 393       else                                                      \
 394         mergeable_constant_section (DECL_MODE (DECL), (ALIGN),  \
 395                                     0);                         \
 396     }                                                           \
 397   else if (TREE_CODE (DECL) == CONSTRUCTOR)                     \
 398     {                                                           \
 399       if ((flag_pic && RELOC)                                   \
 400           || TREE_SIDE_EFFECTS (DECL)                           \
 401           || ! TREE_CONSTANT (DECL))                            \
 402         data_section ();                                        \
 403       else                                                      \
 404         const_section ();                                       \
 405     }                                                           \
 406   else                                                          \
 407     const_section ();                                           \
 408 }
 409
 410 /* Define the strings used for the special svr4 .type and .size directives.
 411    These strings generally do not vary from one system running svr4 to
 412    another, but if a given system (e.g. m88k running svr) needs to use
 413    different pseudo-op names for these, they may be overridden in the
 414    file which includes this one.  */
 415
 416 #define TYPE_ASM_OP     "\t.type\t"
 417 #define SIZE_ASM_OP     "\t.size\t"
 418
 419 /* This is how we tell the assembler that a symbol is weak.  */
 420
 421 #define ASM_WEAKEN_LABEL(FILE, NAME)    \
 422   do                                    \
 423     {                                   \
 424       fputs ("\t.weak\t", (FILE));      \
 425       assemble_name ((FILE), (NAME));   \
 426       fputc ('\n', (FILE));             \
 427     }                                   \
 428   while (0)
 429
 430 /* The following macro defines the format used to output the second
 431    operand of the .type assembler directive.  Different svr4 assemblers
 432    expect various different forms for this operand.  The one given here
 433    is just a default.  You may need to override it in your machine-
 434    specific tm.h file (depending upon the particulars of your assembler).  */
 435
 436 #define TYPE_OPERAND_FMT        "@%s"
 437
 438 /* Write the extra assembler code needed to declare a function's result.
 439    Most svr4 assemblers don't require any special declaration of the
 440    result value, but there are exceptions.  */
 441
 442 #ifndef ASM_DECLARE_RESULT
 443 #define ASM_DECLARE_RESULT(FILE, RESULT)
 444 #endif
 445
 446 /* These macros generate the special .type and .size directives which
 447    are used to set the corresponding fields of the linker symbol table
 448    entries in an ELF object file under SVR4.  These macros also output
 449    the starting labels for the relevant functions/objects.  */
 450
 451 /* Write the extra assembler code needed to declare a function properly.
 452    Some svr4 assemblers need to also have something extra said about the
 453    function's return value.  We allow for that here.  */
 454
 455 #ifndef ASM_DECLARE_FUNCTION_NAME
 456 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)     \
 457   do                                                    \
 458     {                                                   \
 459       fprintf (FILE, "%s", TYPE_ASM_OP);                \
 460       assemble_name (FILE, NAME);                       \
 461       putc (',', FILE);                                 \
 462       fprintf (FILE, TYPE_OPERAND_FMT, "function");     \
 463       putc ('\n', FILE);                                \
 464                                                         \
 465       ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));    \
 466       ASM_OUTPUT_LABEL(FILE, NAME);                     \
 467     }                                                   \
 468   while (0)
 469 #endif
 470
 471 /* Write the extra assembler code needed to declare an object properly.  */
 472
 473 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
 474   do                                                            \
 475     {                                                           \
 476       fprintf (FILE, "%s", TYPE_ASM_OP);                        \
 477       assemble_name (FILE, NAME);                               \
 478       putc (',', FILE);                                         \
 479       fprintf (FILE, TYPE_OPERAND_FMT, "object");               \
 480       putc ('\n', FILE);                                        \
 481                                                                 \
 482       size_directive_output = 0;                                \
 483                                                                 \
 484       if (!flag_inhibit_size_directive                          \
 485           && (DECL) && DECL_SIZE (DECL))                        \
 486         {                                                       \
 487           size_directive_output = 1;                            \
 488           fprintf (FILE, "%s", SIZE_ASM_OP);                    \
 489           assemble_name (FILE, NAME);                           \
 490           putc (',', FILE);                                     \
 491           fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,               \
 492                    int_size_in_bytes (TREE_TYPE (DECL)));       \
 493           fputc ('\n', FILE);                                   \
 494         }                                                       \
 495                                                                 \
 496       ASM_OUTPUT_LABEL (FILE, NAME);                            \
 497     }                                                           \
 498   while (0)
 499
 500 /* Output the size directive for a decl in rest_of_decl_compilation
 501    in the case where we did not do so before the initializer.
 502    Once we find the error_mark_node, we know that the value of
 503    size_directive_output was set
 504    by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
 505
 506 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
 507   do                                                            \
 508     {                                                           \
 509       const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);   \
 510                                                                 \
 511       if (!flag_inhibit_size_directive                          \
 512           && DECL_SIZE (DECL)                                   \
 513           && ! AT_END && TOP_LEVEL                              \
 514           && DECL_INITIAL (DECL) == error_mark_node             \
 515           && !size_directive_output)                            \
 516         {                                                       \
 517           size_directive_output = 1;                            \
 518           fprintf (FILE, "%s", SIZE_ASM_OP);                    \
 519           assemble_name (FILE, name);                           \
 520           putc (',', FILE);                                     \
 521           fprintf (FILE, HOST_WIDE_INT_PRINT_DEC,               \
 522                    int_size_in_bytes (TREE_TYPE (DECL)));       \
 523           fputc ('\n', FILE);                                   \
 524         }                                                       \
 525     }                                                           \
 526   while (0)
 527
 528 /* This is how to declare the size of a function.  */
 529 #ifndef ASM_DECLARE_FUNCTION_SIZE
 530 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
 531   do                                                            \
 532     {                                                           \
 533       if (!flag_inhibit_size_directive)                         \
 534         {                                                       \
 535           char label[256];                                      \
 536           static int labelno;                                   \
 537                                                                 \
 538           labelno++;                                            \
 539                                                                 \
 540           ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno);  \
 541           ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno);     \
 542                                                                 \
 543           fprintf (FILE, "%s", SIZE_ASM_OP);                    \
 544           assemble_name (FILE, (FNAME));                        \
 545           fprintf (FILE, ",");                                  \
 546           assemble_name (FILE, label);                          \
 547           fprintf (FILE, "-");                                  \
 548           assemble_name (FILE, (FNAME));                        \
 549           putc ('\n', FILE);                                    \
 550         }                                                       \
 551     }                                                           \
 552   while (0)
 553 #endif
 554
 555 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
 556    ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
 557    corresponds to a particular byte value [0..255].  For any
 558    given byte value, if the value in the corresponding table
 559    position is zero, the given character can be output directly.
 560    If the table value is 1, the byte must be output as a \ooo
 561    octal escape.  If the tables value is anything else, then the
 562    byte value should be output as a \ followed by the value
 563    in the table.  Note that we can use standard UN*X escape
 564    sequences for many control characters, but we don't use
 565    \a to represent BEL because some svr4 assemblers (e.g. on
 566    the i386) don't know about that.  Also, we don't use \v
 567    since some versions of gas, such as 2.2 did not accept it.  */
 568
 569 #define ESCAPES \
 570 "\1\1\1\1\1\1\1\1btn\1fr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 571 \0\0\"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 572 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\\\0\0\0\
 573 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
 574 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 575 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 576 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
 577 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
 578
 579 /* Some svr4 assemblers have a limit on the number of characters which
 580    can appear in the operand of a .string directive.  If your assembler
 581    has such a limitation, you should define STRING_LIMIT to reflect that
 582    limit.  Note that at least some svr4 assemblers have a limit on the
 583    actual number of bytes in the double-quoted string, and that they
 584    count each character in an escape sequence as one byte.  Thus, an
 585    escape sequence like \377 would count as four bytes.
 586
 587    If your target assembler doesn't support the .string directive, you
 588    should define this to zero.
 589 */
 590
 591 #define STRING_LIMIT    ((unsigned) 256)
 592
 593 #define STRING_ASM_OP   "\t.string\t"
 594
 595 /* The routine used to output NUL terminated strings.  We use a special
 596    version of this for most svr4 targets because doing so makes the
 597    generated assembly code more compact (and thus faster to assemble)
 598    as well as more readable, especially for targets like the i386
 599    (where the only alternative is to output character sequences as
 600    comma separated lists of numbers).   */
 601
 602 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR)            \
 603   do                                                    \
 604     {                                                   \
 605       register const unsigned char *_limited_str =      \
 606         (const unsigned char *) (STR);                  \
 607       register unsigned ch;                             \
 608                                                         \
 609       fprintf ((FILE), "%s\"", STRING_ASM_OP);          \
 610                                                         \
 611       for (; (ch = *_limited_str); _limited_str++)      \
 612         {                                               \
 613           register int escape;                          \
 614                                                         \
 615           switch (escape = ESCAPES[ch])                 \
 616             {                                           \
 617             case 0:                                     \
 618               putc (ch, (FILE));                        \
 619               break;                                    \
 620             case 1:                                     \
 621               fprintf ((FILE), "\\%03o", ch);           \
 622               break;                                    \
 623             default:                                    \
 624               putc ('\\', (FILE));                      \
 625               putc (escape, (FILE));                    \
 626               break;                                    \
 627             }                                           \
 628         }                                               \
 629                                                         \
 630       fprintf ((FILE), "\"\n");                         \
 631     }                                                   \
 632   while (0)
 633
 634 /* The routine used to output sequences of byte values.  We use a special
 635    version of this for most svr4 targets because doing so makes the
 636    generated assembly code more compact (and thus faster to assemble)
 637    as well as more readable.  Note that if we find subparts of the
 638    character sequence which end with NUL (and which are shorter than
 639    STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
 640
 641 #undef  ASM_OUTPUT_ASCII
 642 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
 643   do                                                                    \
 644     {                                                                   \
 645       register const unsigned char *_ascii_bytes =                      \
 646         (const unsigned char *) (STR);                                  \
 647       register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
 648       register unsigned bytes_in_chunk = 0;                             \
 649                                                                         \
 650       for (; _ascii_bytes < limit; _ascii_bytes++)                      \
 651         {                                                               \
 652           register const unsigned char *p;                              \
 653                                                                         \
 654           if (bytes_in_chunk >= 60)                                     \
 655             {                                                           \
 656               fprintf ((FILE), "\"\n");                                 \
 657               bytes_in_chunk = 0;                                       \
 658             }                                                           \
 659                                                                         \
 660           for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
 661             continue;                                                   \
 662                                                                         \
 663           if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT)    \
 664             {                                                           \
 665               if (bytes_in_chunk > 0)                                   \
 666                 {                                                       \
 667                   fprintf ((FILE), "\"\n");                             \
 668                   bytes_in_chunk = 0;                                   \
 669                 }                                                       \
 670                                                                         \
 671               ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
 672               _ascii_bytes = p;                                         \
 673             }                                                           \
 674           else                                                          \
 675             {                                                           \
 676               register int escape;                                      \
 677               register unsigned ch;                                     \
 678                                                                         \
 679               if (bytes_in_chunk == 0)                                  \
 680                 fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP);            \
 681                                                                         \
 682               switch (escape = ESCAPES[ch = *_ascii_bytes])             \
 683                 {                                                       \
 684                 case 0:                                                 \
 685                   putc (ch, (FILE));                                    \
 686                   bytes_in_chunk++;                                     \
 687                   break;                                                \
 688                 case 1:                                                 \
 689                   fprintf ((FILE), "\\%03o", ch);                       \
 690                   bytes_in_chunk += 4;                                  \
 691                   break;                                                \
 692                 default:                                                \
 693                   putc ('\\', (FILE));                                  \
 694                   putc (escape, (FILE));                                \
 695                   bytes_in_chunk += 2;                                  \
 696                   break;                                                \
 697                 }                                                       \
 698             }                                                           \
 699         }                                                               \
 700                                                                         \
 701       if (bytes_in_chunk > 0)                                           \
 702         fprintf ((FILE), "\"\n");                                       \
 703     }                                                                   \
 704   while (0)