svr4.h revision 50397
1/* Operating system specific defines to be used when targeting GCC for some 2 generic System V Release 4 system. 3 Copyright (C) 1991, 94-97, 1998 Free Software Foundation, Inc. 4 Contributed by Ron Guilmette (rfg@monkeys.com). 5 6This file is part of GNU CC. 7 8GNU CC is free software; you can redistribute it and/or modify 9it under the terms of the GNU General Public License as published by 10the Free Software Foundation; either version 2, or (at your option) 11any later version. 12 13GNU CC is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18You should have received a copy of the GNU General Public License 19along with GNU CC; see the file COPYING. If not, write to 20the Free Software Foundation, 59 Temple Place - Suite 330, 21Boston, MA 02111-1307, USA. 22 23 To use this file, make up a file with a name like: 24 25 ?????svr4.h 26 27 where ????? is replaced by the name of the basic hardware that you 28 are targeting for. Then, in the file ?????svr4.h, put something 29 like: 30 31 #include "?????.h" 32 #include "svr4.h" 33 34 followed by any really system-specific defines (or overrides of 35 defines) which you find that you need. For example, CPP_PREDEFINES 36 is defined here with only the defined -Dunix and -DSVR4. You should 37 probably override that in your target-specific ?????svr4.h file 38 with a set of defines that includes these, but also contains an 39 appropriate define for the type of hardware that you are targeting. 40*/ 41 42/* Define a symbol indicating that we are using svr4.h. */ 43#define USING_SVR4_H 44 45/* For the sake of libgcc2.c, indicate target supports atexit. */ 46#define HAVE_ATEXIT 47 48/* Cpp, assembler, linker, library, and startfile spec's. */ 49 50/* This defines which switch letters take arguments. On svr4, most of 51 the normal cases (defined in gcc.c) apply, and we also have -h* and 52 -z* options (for the linker). Note however that there is no such 53 thing as a -T option for svr4. */ 54 55#define SWITCH_TAKES_ARG(CHAR) \ 56 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \ 57 || (CHAR) == 'h' \ 58 || (CHAR) == 'x' \ 59 || (CHAR) == 'z') 60 61/* This defines which multi-letter switches take arguments. On svr4, 62 there are no such switches except those implemented by GCC itself. */ 63 64#define WORD_SWITCH_TAKES_ARG(STR) \ 65 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \ 66 && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \ 67 && strcmp (STR, "Tbss")) 68 69/* You should redefine CPP_PREDEFINES in any file which includes this one. 70 The definition should be appropriate for the type of target system 71 involved, and it should include any -A (assertion) options which are 72 appropriate for the given target system. */ 73#undef CPP_PREDEFINES 74 75/* Provide an ASM_SPEC appropriate for svr4. Here we try to support as 76 many of the specialized svr4 assembler options as seems reasonable, 77 given that there are certain options which we can't (or shouldn't) 78 support directly due to the fact that they conflict with other options 79 for other svr4 tools (e.g. ld) or with other options for GCC itself. 80 For example, we don't support the -o (output file) or -R (remove 81 input file) options because GCC already handles these things. We 82 also don't support the -m (run m4) option for the assembler because 83 that conflicts with the -m (produce load map) option of the svr4 84 linker. We do however allow passing arbitrary options to the svr4 85 assembler via the -Wa, option. 86 87 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,* 88 option. 89*/ 90 91#undef ASM_SPEC 92#define ASM_SPEC \ 93 "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}" 94 95/* svr4 assemblers need the `-' (indicating input from stdin) to come after 96 the -o option (and its argument) for some reason. If we try to put it 97 before the -o option, the assembler will try to read the file named as 98 the output file in the -o option as an input file (after it has already 99 written some stuff to it) and the binary stuff contained therein will 100 cause totally confuse the assembler, resulting in many spurious error 101 messages. */ 102 103#undef ASM_FINAL_SPEC 104#define ASM_FINAL_SPEC "%|" 105 106/* Under svr4, the normal location of the `ld' and `as' programs is the 107 /usr/ccs/bin directory. */ 108 109#ifndef CROSS_COMPILE 110#undef MD_EXEC_PREFIX 111#define MD_EXEC_PREFIX "/usr/ccs/bin/" 112#endif 113 114/* Under svr4, the normal location of the various *crt*.o files is the 115 /usr/ccs/lib directory. */ 116 117#ifndef CROSS_COMPILE 118#undef MD_STARTFILE_PREFIX 119#define MD_STARTFILE_PREFIX "/usr/ccs/lib/" 120#endif 121 122/* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default 123 standard C library (unless we are building a shared library). */ 124 125#undef LIB_SPEC 126#define LIB_SPEC "%{!shared:%{!symbolic:-lc}}" 127 128/* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own 129 magical crtend.o file (see crtstuff.c) which provides part of the 130 support for getting C++ file-scope static object constructed before 131 entering `main', followed by the normal svr3/svr4 "finalizer" file, 132 which is either `gcrtn.o' or `crtn.o'. */ 133 134#undef ENDFILE_SPEC 135#define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}" 136 137/* Provide a LINK_SPEC appropriate for svr4. Here we provide support 138 for the special GCC options -static, -shared, and -symbolic which 139 allow us to link things in one of these three modes by applying the 140 appropriate combinations of options at link-time. We also provide 141 support here for as many of the other svr4 linker options as seems 142 reasonable, given that some of them conflict with options for other 143 svr4 tools (e.g. the assembler). In particular, we do support the 144 -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*, 145 -l*, -o*, -r, -s, -u*, and -L* options are directly supported 146 by gcc.c itself. We don't directly support the -m (generate load 147 map) option because that conflicts with the -m (run m4) option of 148 the svr4 assembler. We also don't directly support the svr4 linker's 149 -I* or -M* options because these conflict with existing GCC options. 150 We do however allow passing arbitrary options to the svr4 linker 151 via the -Wl, option. We don't support the svr4 linker's -a option 152 at all because it is totally useless and because it conflicts with 153 GCC's own -a option. 154 155 Note that gcc doesn't allow a space to follow -Y in a -YP,* option. 156 157 When the -G link option is used (-shared and -symbolic) a final link is 158 not being done. */ 159 160#undef LINK_SPEC 161#ifdef CROSS_COMPILE 162#define LINK_SPEC "%{h*} %{v:-V} \ 163 %{b} %{Wl,*:%*} \ 164 %{static:-dn -Bstatic} \ 165 %{shared:-G -dy -z text} \ 166 %{symbolic:-Bsymbolic -G -dy -z text} \ 167 %{G:-G} \ 168 %{YP,*} \ 169 %{Qy:} %{!Qn:-Qy}" 170#else 171#define LINK_SPEC "%{h*} %{v:-V} \ 172 %{b} %{Wl,*:%*} \ 173 %{static:-dn -Bstatic} \ 174 %{shared:-G -dy -z text} \ 175 %{symbolic:-Bsymbolic -G -dy -z text} \ 176 %{G:-G} \ 177 %{YP,*} \ 178 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \ 179 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \ 180 %{Qy:} %{!Qn:-Qy}" 181#endif 182 183/* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o, 184 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final 185 link step (depending upon the other gcc options selected, such as 186 -traditional and -ansi). These files each contain one (initialized) 187 copy of a special variable called `_lib_version'. Each one of these 188 files has `_lib_version' initialized to a different (enum) value. 189 The SVR4 library routines query the value of `_lib_version' at run 190 to decide how they should behave. Specifically, they decide (based 191 upon the value of `_lib_version') if they will act in a strictly ANSI 192 conforming manner or not. 193*/ 194 195#undef STARTFILE_SPEC 196#define STARTFILE_SPEC "%{!shared: \ 197 %{!symbolic: \ 198 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\ 199 %{pg:gcrti.o%s}%{!pg:crti.o%s} \ 200 %{ansi:values-Xc.o%s} \ 201 %{!ansi: \ 202 %{traditional:values-Xt.o%s} \ 203 %{!traditional:values-Xa.o%s}} \ 204 crtbegin.o%s" 205 206/* Attach a special .ident directive to the end of the file to identify 207 the version of GCC which compiled this code. The format of the 208 .ident string is patterned after the ones produced by native svr4 209 C compilers. */ 210 211#define IDENT_ASM_OP ".ident" 212 213#define ASM_FILE_END(FILE) \ 214do { \ 215 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \ 216 IDENT_ASM_OP, version_string); \ 217 } while (0) 218 219/* Allow #sccs in preprocessor. */ 220 221#define SCCS_DIRECTIVE 222 223/* Output #ident as a .ident. */ 224 225#define ASM_OUTPUT_IDENT(FILE, NAME) \ 226 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME); 227 228/* Use periods rather than dollar signs in special g++ assembler names. */ 229 230#define NO_DOLLAR_IN_LABEL 231 232/* Writing `int' for a bitfield forces int alignment for the structure. */ 233 234#define PCC_BITFIELD_TYPE_MATTERS 1 235 236/* Implicit library calls should use memcpy, not bcopy, etc. */ 237 238#define TARGET_MEM_FUNCTIONS 239 240/* Handle #pragma weak and #pragma pack. */ 241 242#define HANDLE_SYSV_PRAGMA 243 244/* System V Release 4 uses DWARF debugging info. */ 245 246#define DWARF_DEBUGGING_INFO 247 248/* All ELF targets can support DWARF-2. */ 249 250#define DWARF2_DEBUGGING_INFO 251 252/* The numbers used to denote specific machine registers in the System V 253 Release 4 DWARF debugging information are quite likely to be totally 254 different from the numbers used in BSD stabs debugging information 255 for the same kind of target machine. Thus, we undefine the macro 256 DBX_REGISTER_NUMBER here as an extra inducement to get people to 257 provide proper machine-specific definitions of DBX_REGISTER_NUMBER 258 (which is also used to provide DWARF registers numbers in dwarfout.c) 259 in their tm.h files which include this file. */ 260 261#undef DBX_REGISTER_NUMBER 262 263/* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used 264 in general, although it will only work when using gas. */ 265 266#define DBX_DEBUGGING_INFO 267 268/* When generating stabs debugging, use N_BINCL entries. */ 269 270#define DBX_USE_BINCL 271 272/* Use DWARF debugging info by default. */ 273 274#ifndef PREFERRED_DEBUGGING_TYPE 275#define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG 276#endif 277 278/* Make LBRAC and RBRAC addresses relative to the start of the 279 function. The native Solaris stabs debugging format works this 280 way, gdb expects it, and it reduces the number of relocation 281 entries. */ 282 283#define DBX_BLOCKS_FUNCTION_RELATIVE 1 284 285/* When using stabs, gcc2_compiled must be a stabs entry, not an 286 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads 287 the input piecemeal, starting with each N_SO, it's a lot easier if 288 the gcc2 flag symbol is *after* the N_SO rather than before it. So 289 we emit an N_OPT stab there. */ 290 291#define ASM_IDENTIFY_GCC(FILE) \ 292do \ 293 { \ 294 if (write_symbols != DBX_DEBUG) \ 295 fputs ("gcc2_compiled.:\n", FILE); \ 296 } \ 297while (0) 298 299#define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \ 300do \ 301 { \ 302 if (write_symbols == DBX_DEBUG) \ 303 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \ 304 } \ 305while (0) 306 307/* Like block addresses, stabs line numbers are relative to the 308 current function. */ 309 310#define ASM_OUTPUT_SOURCE_LINE(file, line) \ 311do \ 312 { \ 313 static int sym_lineno = 1; \ 314 fprintf (file, ".stabn 68,0,%d,.LM%d-", \ 315 line, sym_lineno); \ 316 assemble_name (file, \ 317 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\ 318 fprintf (file, "\n.LM%d:\n", sym_lineno); \ 319 sym_lineno += 1; \ 320 } \ 321while (0) 322 323/* In order for relative line numbers to work, we must output the 324 stabs entry for the function name first. */ 325 326#define DBX_FUNCTION_FIRST 327 328/* Generate a blank trailing N_SO to mark the end of the .o file, since 329 we can't depend upon the linker to mark .o file boundaries with 330 embedded stabs. */ 331 332#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \ 333do \ 334 { \ 335 text_section (); \ 336 fprintf (FILE, \ 337 "\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO); \ 338 } \ 339while (0) 340 341/* Define the actual types of some ANSI-mandated types. (These 342 definitions should work for most SVR4 systems). */ 343 344#undef SIZE_TYPE 345#define SIZE_TYPE "unsigned int" 346 347#undef PTRDIFF_TYPE 348#define PTRDIFF_TYPE "int" 349 350#undef WCHAR_TYPE 351#define WCHAR_TYPE "long int" 352 353#undef WCHAR_TYPE_SIZE 354#define WCHAR_TYPE_SIZE BITS_PER_WORD 355 356/* This causes trouble, because it requires the host machine 357 to support ANSI C. */ 358/* #define MULTIBYTE_CHARS */ 359 360#undef ASM_BYTE_OP 361#define ASM_BYTE_OP ".byte" 362 363#undef SET_ASM_OP 364#define SET_ASM_OP ".set" 365 366/* This is how to begin an assembly language file. Most svr4 assemblers want 367 at least a .file directive to come first, and some want to see a .version 368 directive come right after that. Here we just establish a default 369 which generates only the .file directive. If you need a .version 370 directive for any specific target, you should override this definition 371 in the target-specific file which includes this one. */ 372 373#undef ASM_FILE_START 374#define ASM_FILE_START(FILE) \ 375 output_file_directive ((FILE), main_input_filename) 376 377/* This is how to allocate empty space in some section. The .zero 378 pseudo-op is used for this on most svr4 assemblers. */ 379 380#define SKIP_ASM_OP ".zero" 381 382#undef ASM_OUTPUT_SKIP 383#define ASM_OUTPUT_SKIP(FILE,SIZE) \ 384 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE)) 385 386/* The prefix to add to user-visible assembler symbols. 387 388 For System V Release 4 the convention is *not* to prepend a leading 389 underscore onto user-level symbol names. */ 390 391#undef USER_LABEL_PREFIX 392#define USER_LABEL_PREFIX "" 393 394/* This is how to output an internal numbered label where 395 PREFIX is the class of label and NUM is the number within the class. 396 397 For most svr4 systems, the convention is that any symbol which begins 398 with a period is not put into the linker symbol table by the assembler. */ 399 400#undef ASM_OUTPUT_INTERNAL_LABEL 401#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \ 402do { \ 403 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \ 404} while (0) 405 406/* This is how to store into the string LABEL 407 the symbol_ref name of an internal numbered label where 408 PREFIX is the class of label and NUM is the number within the class. 409 This is suitable for output with `assemble_name'. 410 411 For most svr4 systems, the convention is that any symbol which begins 412 with a period is not put into the linker symbol table by the assembler. */ 413 414#undef ASM_GENERATE_INTERNAL_LABEL 415#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ 416do { \ 417 sprintf (LABEL, "*.%s%d", PREFIX, (unsigned) (NUM)); \ 418} while (0) 419 420/* Output the label which precedes a jumptable. Note that for all svr4 421 systems where we actually generate jumptables (which is to say every 422 svr4 target except i386, where we use casesi instead) we put the jump- 423 tables into the .rodata section and since other stuff could have been 424 put into the .rodata section prior to any given jumptable, we have to 425 make sure that the location counter for the .rodata section gets pro- 426 perly re-aligned prior to the actual beginning of the jump table. */ 427 428#define ALIGN_ASM_OP ".align" 429 430#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL 431#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \ 432 ASM_OUTPUT_ALIGN ((FILE), 2); 433#endif 434 435#undef ASM_OUTPUT_CASE_LABEL 436#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \ 437 do { \ 438 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \ 439 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \ 440 } while (0) 441 442/* The standard SVR4 assembler seems to require that certain builtin 443 library routines (e.g. .udiv) be explicitly declared as .globl 444 in each assembly file where they are referenced. */ 445 446#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ 447 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0)) 448 449/* This says how to output assembler code to declare an 450 uninitialized external linkage data object. Under SVR4, 451 the linker seems to want the alignment of data objects 452 to depend on their types. We do exactly that here. */ 453 454#define COMMON_ASM_OP ".comm" 455 456#undef ASM_OUTPUT_ALIGNED_COMMON 457#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ 458do { \ 459 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \ 460 assemble_name ((FILE), (NAME)); \ 461 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ 462} while (0) 463 464/* This says how to output assembler code to declare an 465 uninitialized internal linkage data object. Under SVR4, 466 the linker seems to want the alignment of data objects 467 to depend on their types. We do exactly that here. */ 468 469#define LOCAL_ASM_OP ".local" 470 471#undef ASM_OUTPUT_ALIGNED_LOCAL 472#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ 473do { \ 474 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \ 475 assemble_name ((FILE), (NAME)); \ 476 fprintf ((FILE), "\n"); \ 477 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \ 478} while (0) 479 480/* Biggest alignment supported by the object file format of this 481 machine. Use this macro to limit the alignment which can be 482 specified using the `__attribute__ ((aligned (N)))' construct. If 483 not defined, the default value is `BIGGEST_ALIGNMENT'. */ 484 485#define MAX_OFILE_ALIGNMENT (32768*8) 486 487/* This is the pseudo-op used to generate a 32-bit word of data with a 488 specific value in some section. This is the same for all known svr4 489 assemblers. */ 490 491#define INT_ASM_OP ".long" 492 493/* This is the pseudo-op used to generate a contiguous sequence of byte 494 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL 495 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */ 496 497#undef ASCII_DATA_ASM_OP 498#define ASCII_DATA_ASM_OP ".ascii" 499 500/* Support const sections and the ctors and dtors sections for g++. 501 Note that there appears to be two different ways to support const 502 sections at the moment. You can either #define the symbol 503 READONLY_DATA_SECTION (giving it some code which switches to the 504 readonly data section) or else you can #define the symbols 505 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and 506 SELECT_RTX_SECTION. We do both here just to be on the safe side. */ 507 508#define USE_CONST_SECTION 1 509 510#define CONST_SECTION_ASM_OP ".section\t.rodata" 511 512/* Define the pseudo-ops used to switch to the .ctors and .dtors sections. 513 514 Note that we want to give these sections the SHF_WRITE attribute 515 because these sections will actually contain data (i.e. tables of 516 addresses of functions in the current root executable or shared library 517 file) and, in the case of a shared library, the relocatable addresses 518 will have to be properly resolved/relocated (and then written into) by 519 the dynamic linker when it actually attaches the given shared library 520 to the executing process. (Note that on SVR4, you may wish to use the 521 `-z text' option to the ELF linker, when building a shared library, as 522 an additional check that you are doing everything right. But if you do 523 use the `-z text' option when building a shared library, you will get 524 errors unless the .ctors and .dtors sections are marked as writable 525 via the SHF_WRITE attribute.) */ 526 527#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\"" 528#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\"" 529 530/* On svr4, we *do* have support for the .init and .fini sections, and we 531 can put stuff in there to be executed before and after `main'. We let 532 crtstuff.c and other files know this by defining the following symbols. 533 The definitions say how to change sections to the .init and .fini 534 sections. This is the same for all known svr4 assemblers. */ 535 536#define INIT_SECTION_ASM_OP ".section\t.init" 537#define FINI_SECTION_ASM_OP ".section\t.fini" 538 539/* A default list of other sections which we might be "in" at any given 540 time. For targets that use additional sections (e.g. .tdesc) you 541 should override this definition in the target-specific file which 542 includes this file. */ 543 544#undef EXTRA_SECTIONS 545#define EXTRA_SECTIONS in_const, in_ctors, in_dtors 546 547/* A default list of extra section function definitions. For targets 548 that use additional sections (e.g. .tdesc) you should override this 549 definition in the target-specific file which includes this file. */ 550 551#undef EXTRA_SECTION_FUNCTIONS 552#define EXTRA_SECTION_FUNCTIONS \ 553 CONST_SECTION_FUNCTION \ 554 CTORS_SECTION_FUNCTION \ 555 DTORS_SECTION_FUNCTION 556 557#define READONLY_DATA_SECTION() const_section () 558 559extern void text_section (); 560 561#define CONST_SECTION_FUNCTION \ 562void \ 563const_section () \ 564{ \ 565 if (!USE_CONST_SECTION) \ 566 text_section(); \ 567 else if (in_section != in_const) \ 568 { \ 569 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \ 570 in_section = in_const; \ 571 } \ 572} 573 574#define CTORS_SECTION_FUNCTION \ 575void \ 576ctors_section () \ 577{ \ 578 if (in_section != in_ctors) \ 579 { \ 580 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ 581 in_section = in_ctors; \ 582 } \ 583} 584 585#define DTORS_SECTION_FUNCTION \ 586void \ 587dtors_section () \ 588{ \ 589 if (in_section != in_dtors) \ 590 { \ 591 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ 592 in_section = in_dtors; \ 593 } \ 594} 595 596/* Switch into a generic section. 597 598 We make the section read-only and executable for a function decl, 599 read-only for a const data decl, and writable for a non-const data decl. 600 601 If the section has already been defined, we must not 602 emit the attributes here. The SVR4 assembler does not 603 recognize section redefinitions. 604 If DECL is NULL, no attributes are emitted. */ 605 606#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \ 607do { \ 608 static struct section_info \ 609 { \ 610 struct section_info *next; \ 611 char *name; \ 612 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \ 613 } *sections; \ 614 struct section_info *s; \ 615 char *mode; \ 616 enum sect_enum type; \ 617 \ 618 for (s = sections; s; s = s->next) \ 619 if (!strcmp (NAME, s->name)) \ 620 break; \ 621 \ 622 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \ 623 type = SECT_EXEC, mode = "ax"; \ 624 else if (DECL && DECL_READONLY_SECTION (DECL, RELOC)) \ 625 type = SECT_RO, mode = "a"; \ 626 else \ 627 type = SECT_RW, mode = "aw"; \ 628 \ 629 if (s == 0) \ 630 { \ 631 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \ 632 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \ 633 strcpy (s->name, NAME); \ 634 s->type = type; \ 635 s->next = sections; \ 636 sections = s; \ 637 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \ 638 } \ 639 else \ 640 { \ 641 if (DECL && s->type != type) \ 642 error_with_decl (DECL, "%s causes a section type conflict"); \ 643 \ 644 fprintf (FILE, ".section\t%s\n", NAME); \ 645 } \ 646} while (0) 647 648#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) 649#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL)) 650#define UNIQUE_SECTION(DECL,RELOC) \ 651do { \ 652 int len; \ 653 char *name, *string, *prefix; \ 654 \ 655 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \ 656 \ 657 if (! DECL_ONE_ONLY (DECL)) \ 658 prefix = "."; \ 659 else if (TREE_CODE (DECL) == FUNCTION_DECL) \ 660 prefix = ".gnu.linkonce.t."; \ 661 else if (DECL_READONLY_SECTION (DECL, RELOC)) \ 662 prefix = ".gnu.linkonce.r."; \ 663 else \ 664 prefix = ".gnu.linkonce.d."; \ 665 \ 666 len = strlen (name) + strlen (prefix); \ 667 string = alloca (len + 1); \ 668 sprintf (string, "%s%s", prefix, name); \ 669 \ 670 DECL_SECTION_NAME (DECL) = build_string (len, string); \ 671} while (0) 672 673/* A C statement (sans semicolon) to output an element in the table of 674 global constructors. */ 675#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ 676 do { \ 677 ctors_section (); \ 678 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \ 679 assemble_name (FILE, NAME); \ 680 fprintf (FILE, "\n"); \ 681 } while (0) 682 683/* A C statement (sans semicolon) to output an element in the table of 684 global destructors. */ 685#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \ 686 do { \ 687 dtors_section (); \ 688 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \ 689 assemble_name (FILE, NAME); \ 690 fprintf (FILE, "\n"); \ 691 } while (0) 692 693/* A C statement or statements to switch to the appropriate 694 section for output of DECL. DECL is either a `VAR_DECL' node 695 or a constant of some sort. RELOC indicates whether forming 696 the initial value of DECL requires link-time relocations. */ 697 698#define SELECT_SECTION(DECL,RELOC) \ 699{ \ 700 if (flag_pic && RELOC) \ 701 data_section (); \ 702 else if (TREE_CODE (DECL) == STRING_CST) \ 703 { \ 704 if (! flag_writable_strings) \ 705 const_section (); \ 706 else \ 707 data_section (); \ 708 } \ 709 else if (TREE_CODE (DECL) == VAR_DECL) \ 710 { \ 711 if (! DECL_READONLY_SECTION (DECL, RELOC)) \ 712 data_section (); \ 713 else \ 714 const_section (); \ 715 } \ 716 else \ 717 const_section (); \ 718} 719 720/* A C statement or statements to switch to the appropriate 721 section for output of RTX in mode MODE. RTX is some kind 722 of constant in RTL. The argument MODE is redundant except 723 in the case of a `const_int' rtx. Currently, these always 724 go into the const section. */ 725 726#undef SELECT_RTX_SECTION 727#define SELECT_RTX_SECTION(MODE,RTX) const_section() 728 729/* Define the strings used for the special svr4 .type and .size directives. 730 These strings generally do not vary from one system running svr4 to 731 another, but if a given system (e.g. m88k running svr) needs to use 732 different pseudo-op names for these, they may be overridden in the 733 file which includes this one. */ 734 735#define TYPE_ASM_OP ".type" 736#define SIZE_ASM_OP ".size" 737 738/* This is how we tell the assembler that a symbol is weak. */ 739 740#define ASM_WEAKEN_LABEL(FILE,NAME) \ 741 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ 742 fputc ('\n', FILE); } while (0) 743 744/* The following macro defines the format used to output the second 745 operand of the .type assembler directive. Different svr4 assemblers 746 expect various different forms for this operand. The one given here 747 is just a default. You may need to override it in your machine- 748 specific tm.h file (depending upon the particulars of your assembler). */ 749 750#define TYPE_OPERAND_FMT "@%s" 751 752/* Write the extra assembler code needed to declare a function's result. 753 Most svr4 assemblers don't require any special declaration of the 754 result value, but there are exceptions. */ 755 756#ifndef ASM_DECLARE_RESULT 757#define ASM_DECLARE_RESULT(FILE, RESULT) 758#endif 759 760/* These macros generate the special .type and .size directives which 761 are used to set the corresponding fields of the linker symbol table 762 entries in an ELF object file under SVR4. These macros also output 763 the starting labels for the relevant functions/objects. */ 764 765/* Write the extra assembler code needed to declare a function properly. 766 Some svr4 assemblers need to also have something extra said about the 767 function's return value. We allow for that here. */ 768 769#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \ 770 do { \ 771 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \ 772 assemble_name (FILE, NAME); \ 773 putc (',', FILE); \ 774 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \ 775 putc ('\n', FILE); \ 776 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \ 777 ASM_OUTPUT_LABEL(FILE, NAME); \ 778 } while (0) 779 780/* Write the extra assembler code needed to declare an object properly. */ 781 782#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ 783 do { \ 784 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \ 785 assemble_name (FILE, NAME); \ 786 putc (',', FILE); \ 787 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \ 788 putc ('\n', FILE); \ 789 size_directive_output = 0; \ 790 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \ 791 { \ 792 size_directive_output = 1; \ 793 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ 794 assemble_name (FILE, NAME); \ 795 putc (',', FILE); \ 796 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ 797 int_size_in_bytes (TREE_TYPE (DECL))); \ 798 fputc ('\n', FILE); \ 799 } \ 800 ASM_OUTPUT_LABEL(FILE, NAME); \ 801 } while (0) 802 803/* Output the size directive for a decl in rest_of_decl_compilation 804 in the case where we did not do so before the initializer. 805 Once we find the error_mark_node, we know that the value of 806 size_directive_output was set 807 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ 808 809#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ 810do { \ 811 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ 812 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \ 813 && ! AT_END && TOP_LEVEL \ 814 && DECL_INITIAL (DECL) == error_mark_node \ 815 && !size_directive_output) \ 816 { \ 817 size_directive_output = 1; \ 818 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ 819 assemble_name (FILE, name); \ 820 putc (',', FILE); \ 821 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \ 822 int_size_in_bytes (TREE_TYPE (DECL))); \ 823 fputc ('\n', FILE); \ 824 } \ 825 } while (0) 826 827/* This is how to declare the size of a function. */ 828 829#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \ 830 do { \ 831 if (!flag_inhibit_size_directive) \ 832 { \ 833 char label[256]; \ 834 static int labelno; \ 835 labelno++; \ 836 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \ 837 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \ 838 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \ 839 assemble_name (FILE, (FNAME)); \ 840 fprintf (FILE, ","); \ 841 assemble_name (FILE, label); \ 842 fprintf (FILE, "-"); \ 843 assemble_name (FILE, (FNAME)); \ 844 putc ('\n', FILE); \ 845 } \ 846 } while (0) 847 848/* A table of bytes codes used by the ASM_OUTPUT_ASCII and 849 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table 850 corresponds to a particular byte value [0..255]. For any 851 given byte value, if the value in the corresponding table 852 position is zero, the given character can be output directly. 853 If the table value is 1, the byte must be output as a \ooo 854 octal escape. If the tables value is anything else, then the 855 byte value should be output as a \ followed by the value 856 in the table. Note that we can use standard UN*X escape 857 sequences for many control characters, but we don't use 858 \a to represent BEL because some svr4 assemblers (e.g. on 859 the i386) don't know about that. Also, we don't use \v 860 since some versions of gas, such as 2.2 did not accept it. */ 861 862#define ESCAPES \ 863"\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\ 864\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\ 865\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\ 866\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\ 867\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\ 868\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\ 869\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\ 870\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" 871 872/* Some svr4 assemblers have a limit on the number of characters which 873 can appear in the operand of a .string directive. If your assembler 874 has such a limitation, you should define STRING_LIMIT to reflect that 875 limit. Note that at least some svr4 assemblers have a limit on the 876 actual number of bytes in the double-quoted string, and that they 877 count each character in an escape sequence as one byte. Thus, an 878 escape sequence like \377 would count as four bytes. 879 880 If your target assembler doesn't support the .string directive, you 881 should define this to zero. 882*/ 883 884#define STRING_LIMIT ((unsigned) 256) 885 886#define STRING_ASM_OP ".string" 887 888/* The routine used to output NUL terminated strings. We use a special 889 version of this for most svr4 targets because doing so makes the 890 generated assembly code more compact (and thus faster to assemble) 891 as well as more readable, especially for targets like the i386 892 (where the only alternative is to output character sequences as 893 comma separated lists of numbers). */ 894 895#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \ 896 do \ 897 { \ 898 register unsigned char *_limited_str = (unsigned char *) (STR); \ 899 register unsigned ch; \ 900 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \ 901 for (; (ch = *_limited_str); _limited_str++) \ 902 { \ 903 register int escape; \ 904 switch (escape = ESCAPES[ch]) \ 905 { \ 906 case 0: \ 907 putc (ch, (FILE)); \ 908 break; \ 909 case 1: \ 910 fprintf ((FILE), "\\%03o", ch); \ 911 break; \ 912 default: \ 913 putc ('\\', (FILE)); \ 914 putc (escape, (FILE)); \ 915 break; \ 916 } \ 917 } \ 918 fprintf ((FILE), "\"\n"); \ 919 } \ 920 while (0) 921 922/* The routine used to output sequences of byte values. We use a special 923 version of this for most svr4 targets because doing so makes the 924 generated assembly code more compact (and thus faster to assemble) 925 as well as more readable. Note that if we find subparts of the 926 character sequence which end with NUL (and which are shorter than 927 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */ 928 929#undef ASM_OUTPUT_ASCII 930#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \ 931 do \ 932 { \ 933 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \ 934 register unsigned char *limit = _ascii_bytes + (LENGTH); \ 935 register unsigned bytes_in_chunk = 0; \ 936 for (; _ascii_bytes < limit; _ascii_bytes++) \ 937 { \ 938 register unsigned char *p; \ 939 if (bytes_in_chunk >= 60) \ 940 { \ 941 fprintf ((FILE), "\"\n"); \ 942 bytes_in_chunk = 0; \ 943 } \ 944 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \ 945 continue; \ 946 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \ 947 { \ 948 if (bytes_in_chunk > 0) \ 949 { \ 950 fprintf ((FILE), "\"\n"); \ 951 bytes_in_chunk = 0; \ 952 } \ 953 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \ 954 _ascii_bytes = p; \ 955 } \ 956 else \ 957 { \ 958 register int escape; \ 959 register unsigned ch; \ 960 if (bytes_in_chunk == 0) \ 961 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \ 962 switch (escape = ESCAPES[ch = *_ascii_bytes]) \ 963 { \ 964 case 0: \ 965 putc (ch, (FILE)); \ 966 bytes_in_chunk++; \ 967 break; \ 968 case 1: \ 969 fprintf ((FILE), "\\%03o", ch); \ 970 bytes_in_chunk += 4; \ 971 break; \ 972 default: \ 973 putc ('\\', (FILE)); \ 974 putc (escape, (FILE)); \ 975 bytes_in_chunk += 2; \ 976 break; \ 977 } \ 978 } \ 979 } \ 980 if (bytes_in_chunk > 0) \ 981 fprintf ((FILE), "\"\n"); \ 982 } \ 983 while (0) 984 985/* All SVR4 targets use the ELF object file format. */ 986#define OBJECT_FORMAT_ELF 987