1 /* Operating system specific defines to be used when targeting GCC for some
2 generic System V Release 4 system.
3 Copyright (C) 1991, 94-98, 1999 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@monkeys.com).
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA.
23 To use this file, make up a file with a name like:
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
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.
42 /* Define a symbol indicating that we are using svr4.h. */
45 /* Cpp, assembler, linker, library, and startfile spec's. */
47 /* This defines which switch letters take arguments. On svr4, most of
48 the normal cases (defined in gcc.c) apply, and we also have -h* and
49 -z* options (for the linker). Note however that there is no such
50 thing as a -T option for svr4. */
52 #define SWITCH_TAKES_ARG(CHAR) \
53 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
58 /* This defines which multi-letter switches take arguments. On svr4,
59 there are no such switches except those implemented by GCC itself. */
61 #define WORD_SWITCH_TAKES_ARG(STR) \
62 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
63 && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \
64 && strcmp (STR, "Tbss"))
66 /* You should redefine CPP_PREDEFINES in any file which includes this one.
67 The definition should be appropriate for the type of target system
68 involved, and it should include any -A (assertion) options which are
69 appropriate for the given target system. */
72 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
73 many of the specialized svr4 assembler options as seems reasonable,
74 given that there are certain options which we can't (or shouldn't)
75 support directly due to the fact that they conflict with other options
76 for other svr4 tools (e.g. ld) or with other options for GCC itself.
77 For example, we don't support the -o (output file) or -R (remove
78 input file) options because GCC already handles these things. We
79 also don't support the -m (run m4) option for the assembler because
80 that conflicts with the -m (produce load map) option of the svr4
81 linker. We do however allow passing arbitrary options to the svr4
82 assembler via the -Wa, option.
84 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
90 "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
92 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
93 the -o option (and its argument) for some reason. If we try to put it
94 before the -o option, the assembler will try to read the file named as
95 the output file in the -o option as an input file (after it has already
96 written some stuff to it) and the binary stuff contained therein will
97 cause totally confuse the assembler, resulting in many spurious error
100 #undef ASM_FINAL_SPEC
101 #define ASM_FINAL_SPEC "%|"
103 /* Under svr4, the normal location of the `ld' and `as' programs is the
104 /usr/ccs/bin directory. */
106 #ifndef CROSS_COMPILE
107 #undef MD_EXEC_PREFIX
108 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
111 /* Under svr4, the normal location of the various *crt*.o files is the
112 /usr/ccs/lib directory. */
114 #ifndef CROSS_COMPILE
115 #undef MD_STARTFILE_PREFIX
116 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
119 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
120 standard C library (unless we are building a shared library). */
123 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
125 /* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own
126 magical crtend.o file (see crtstuff.c) which provides part of the
127 support for getting C++ file-scope static object constructed before
128 entering `main', followed by the normal svr3/svr4 "finalizer" file,
129 which is either `gcrtn.o' or `crtn.o'. */
132 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
134 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
135 for the special GCC options -static, -shared, and -symbolic which
136 allow us to link things in one of these three modes by applying the
137 appropriate combinations of options at link-time. We also provide
138 support here for as many of the other svr4 linker options as seems
139 reasonable, given that some of them conflict with options for other
140 svr4 tools (e.g. the assembler). In particular, we do support the
141 -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
142 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
143 by gcc.c itself. We don't directly support the -m (generate load
144 map) option because that conflicts with the -m (run m4) option of
145 the svr4 assembler. We also don't directly support the svr4 linker's
146 -I* or -M* options because these conflict with existing GCC options.
147 We do however allow passing arbitrary options to the svr4 linker
148 via the -Wl, option. We don't support the svr4 linker's -a option
149 at all because it is totally useless and because it conflicts with
152 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
154 When the -G link option is used (-shared and -symbolic) a final link is
159 #define LINK_SPEC "%{h*} %{v:-V} \
161 %{static:-dn -Bstatic} \
162 %{shared:-G -dy -z text} \
163 %{symbolic:-Bsymbolic -G -dy -z text} \
168 #define LINK_SPEC "%{h*} %{v:-V} \
170 %{static:-dn -Bstatic} \
171 %{shared:-G -dy -z text} \
172 %{symbolic:-Bsymbolic -G -dy -z text} \
175 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
176 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
180 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
181 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
182 link step (depending upon the other gcc options selected, such as
183 -traditional and -ansi). These files each contain one (initialized)
184 copy of a special variable called `_lib_version'. Each one of these
185 files has `_lib_version' initialized to a different (enum) value.
186 The SVR4 library routines query the value of `_lib_version' at run
187 to decide how they should behave. Specifically, they decide (based
188 upon the value of `_lib_version') if they will act in a strictly ANSI
189 conforming manner or not.
192 #undef STARTFILE_SPEC
193 #define STARTFILE_SPEC "%{!shared: \
195 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
196 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
197 %{ansi:values-Xc.o%s} \
199 %{traditional:values-Xt.o%s} \
200 %{!traditional:values-Xa.o%s}} \
203 /* Attach a special .ident directive to the end of the file to identify
204 the version of GCC which compiled this code. The format of the
205 .ident string is patterned after the ones produced by native svr4
208 #define IDENT_ASM_OP ".ident"
210 #define ASM_FILE_END(FILE) \
212 if (!flag_no_ident) \
213 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
214 IDENT_ASM_OP, version_string); \
217 /* Allow #sccs in preprocessor. */
219 #define SCCS_DIRECTIVE
221 /* Output #ident as a .ident. */
223 #define ASM_OUTPUT_IDENT(FILE, NAME) \
224 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
226 /* Use periods rather than dollar signs in special g++ assembler names. */
228 #define NO_DOLLAR_IN_LABEL
230 /* Writing `int' for a bitfield forces int alignment for the structure. */
232 #define PCC_BITFIELD_TYPE_MATTERS 1
234 /* Implicit library calls should use memcpy, not bcopy, etc. */
236 #define TARGET_MEM_FUNCTIONS
238 /* Handle #pragma weak and #pragma pack. */
240 #define HANDLE_SYSV_PRAGMA
242 /* System V Release 4 uses DWARF debugging info. */
244 #define DWARF_DEBUGGING_INFO
246 /* All ELF targets can support DWARF-2. */
247 #ifndef DWARF2_DEBUGGING_INFO
248 #define DWARF2_DEBUGGING_INFO
251 /* The numbers used to denote specific machine registers in the System V
252 Release 4 DWARF debugging information are quite likely to be totally
253 different from the numbers used in BSD stabs debugging information
254 for the same kind of target machine. Thus, we undefine the macro
255 DBX_REGISTER_NUMBER here as an extra inducement to get people to
256 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
257 (which is also used to provide DWARF registers numbers in dwarfout.c)
258 in their tm.h files which include this file. */
260 #undef DBX_REGISTER_NUMBER
262 /* Use DWARF debugging info by default. */
264 #ifndef PREFERRED_DEBUGGING_TYPE
265 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
268 /* But allow STABS to be supoorted as well. */
271 /* Define the actual types of some ANSI-mandated types. (These
272 definitions should work for most SVR4 systems). */
275 #define SIZE_TYPE "unsigned int"
278 #define PTRDIFF_TYPE "int"
281 #define WCHAR_TYPE "long int"
283 #undef WCHAR_TYPE_SIZE
284 #define WCHAR_TYPE_SIZE BITS_PER_WORD
286 /* This causes trouble, because it requires the host machine
287 to support ANSI C. */
288 /* #define MULTIBYTE_CHARS */
291 #define ASM_BYTE_OP ".byte"
294 #define SET_ASM_OP ".set"
296 /* This is how to begin an assembly language file. Most svr4 assemblers want
297 at least a .file directive to come first, and some want to see a .version
298 directive come right after that. Here we just establish a default
299 which generates only the .file directive. If you need a .version
300 directive for any specific target, you should override this definition
301 in the target-specific file which includes this one. */
303 #undef ASM_FILE_START
304 #define ASM_FILE_START(FILE) \
305 output_file_directive ((FILE), main_input_filename)
307 /* This is how to allocate empty space in some section. The .zero
308 pseudo-op is used for this on most svr4 assemblers. */
310 #define SKIP_ASM_OP ".zero"
312 #undef ASM_OUTPUT_SKIP
313 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
314 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
316 /* The prefix to add to user-visible assembler symbols.
318 For System V Release 4 the convention is *not* to prepend a leading
319 underscore onto user-level symbol names. */
321 #undef USER_LABEL_PREFIX
322 #define USER_LABEL_PREFIX ""
324 /* This is how to output an internal numbered label where
325 PREFIX is the class of label and NUM is the number within the class.
327 For most svr4 systems, the convention is that any symbol which begins
328 with a period is not put into the linker symbol table by the assembler. */
330 #undef ASM_OUTPUT_INTERNAL_LABEL
331 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
333 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
336 /* This is how to store into the string LABEL
337 the symbol_ref name of an internal numbered label where
338 PREFIX is the class of label and NUM is the number within the class.
339 This is suitable for output with `assemble_name'.
341 For most svr4 systems, the convention is that any symbol which begins
342 with a period is not put into the linker symbol table by the assembler. */
344 #undef ASM_GENERATE_INTERNAL_LABEL
345 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
347 sprintf (LABEL, "*.%s%d", PREFIX, (unsigned) (NUM)); \
350 /* Output the label which precedes a jumptable. Note that for all svr4
351 systems where we actually generate jumptables (which is to say every
352 svr4 target except i386, where we use casesi instead) we put the jump-
353 tables into the .rodata section and since other stuff could have been
354 put into the .rodata section prior to any given jumptable, we have to
355 make sure that the location counter for the .rodata section gets pro-
356 perly re-aligned prior to the actual beginning of the jump table. */
358 #define ALIGN_ASM_OP ".align"
360 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
361 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
362 ASM_OUTPUT_ALIGN ((FILE), 2);
365 #undef ASM_OUTPUT_CASE_LABEL
366 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
368 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
369 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
372 /* The standard SVR4 assembler seems to require that certain builtin
373 library routines (e.g. .udiv) be explicitly declared as .globl
374 in each assembly file where they are referenced. */
376 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
377 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
379 /* This says how to output assembler code to declare an
380 uninitialized external linkage data object. Under SVR4,
381 the linker seems to want the alignment of data objects
382 to depend on their types. We do exactly that here. */
384 #define COMMON_ASM_OP ".comm"
386 #undef ASM_OUTPUT_ALIGNED_COMMON
387 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
389 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
390 assemble_name ((FILE), (NAME)); \
391 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
394 /* This says how to output assembler code to declare an
395 uninitialized internal linkage data object. Under SVR4,
396 the linker seems to want the alignment of data objects
397 to depend on their types. We do exactly that here. */
399 #define LOCAL_ASM_OP ".local"
401 #undef ASM_OUTPUT_ALIGNED_LOCAL
402 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
404 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
405 assemble_name ((FILE), (NAME)); \
406 fprintf ((FILE), "\n"); \
407 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
410 /* Biggest alignment supported by the object file format of this
411 machine. Use this macro to limit the alignment which can be
412 specified using the `__attribute__ ((aligned (N)))' construct. If
413 not defined, the default value is `BIGGEST_ALIGNMENT'. */
415 #define MAX_OFILE_ALIGNMENT (32768*8)
417 /* This is the pseudo-op used to generate a 32-bit word of data with a
418 specific value in some section. This is the same for all known svr4
421 #define INT_ASM_OP ".long"
423 /* This is the pseudo-op used to generate a contiguous sequence of byte
424 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
425 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
427 #undef ASCII_DATA_ASM_OP
428 #define ASCII_DATA_ASM_OP ".ascii"
430 /* Support const sections and the ctors and dtors sections for g++.
431 Note that there appears to be two different ways to support const
432 sections at the moment. You can either #define the symbol
433 READONLY_DATA_SECTION (giving it some code which switches to the
434 readonly data section) or else you can #define the symbols
435 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
436 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
438 #define USE_CONST_SECTION 1
440 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
442 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
444 Note that we want to give these sections the SHF_WRITE attribute
445 because these sections will actually contain data (i.e. tables of
446 addresses of functions in the current root executable or shared library
447 file) and, in the case of a shared library, the relocatable addresses
448 will have to be properly resolved/relocated (and then written into) by
449 the dynamic linker when it actually attaches the given shared library
450 to the executing process. (Note that on SVR4, you may wish to use the
451 `-z text' option to the ELF linker, when building a shared library, as
452 an additional check that you are doing everything right. But if you do
453 use the `-z text' option when building a shared library, you will get
454 errors unless the .ctors and .dtors sections are marked as writable
455 via the SHF_WRITE attribute.) */
457 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
458 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
460 /* On svr4, we *do* have support for the .init and .fini sections, and we
461 can put stuff in there to be executed before and after `main'. We let
462 crtstuff.c and other files know this by defining the following symbols.
463 The definitions say how to change sections to the .init and .fini
464 sections. This is the same for all known svr4 assemblers. */
466 #define INIT_SECTION_ASM_OP "\t.section\t.init"
467 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
469 /* A default list of other sections which we might be "in" at any given
470 time. For targets that use additional sections (e.g. .tdesc) you
471 should override this definition in the target-specific file which
472 includes this file. */
474 #undef EXTRA_SECTIONS
475 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
477 /* A default list of extra section function definitions. For targets
478 that use additional sections (e.g. .tdesc) you should override this
479 definition in the target-specific file which includes this file. */
481 #undef EXTRA_SECTION_FUNCTIONS
482 #define EXTRA_SECTION_FUNCTIONS \
483 CONST_SECTION_FUNCTION \
484 CTORS_SECTION_FUNCTION \
485 DTORS_SECTION_FUNCTION
487 #define READONLY_DATA_SECTION() const_section ()
489 extern void text_section ();
491 #define CONST_SECTION_FUNCTION \
495 if (!USE_CONST_SECTION) \
497 else if (in_section != in_const) \
499 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
500 in_section = in_const; \
504 #define CTORS_SECTION_FUNCTION \
508 if (in_section != in_ctors) \
510 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
511 in_section = in_ctors; \
515 #define DTORS_SECTION_FUNCTION \
519 if (in_section != in_dtors) \
521 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
522 in_section = in_dtors; \
526 /* Switch into a generic section.
528 We make the section read-only and executable for a function decl,
529 read-only for a const data decl, and writable for a non-const data decl.
531 If the section has already been defined, we must not
532 emit the attributes here. The SVR4 assembler does not
533 recognize section redefinitions.
534 If DECL is NULL, no attributes are emitted. */
536 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
538 static struct section_info \
540 struct section_info *next; \
542 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
544 struct section_info *s; \
546 enum sect_enum type; \
548 for (s = sections; s; s = s->next) \
549 if (!strcmp (NAME, s->name)) \
552 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
553 type = SECT_EXEC, mode = "ax"; \
554 else if (DECL && DECL_READONLY_SECTION (DECL, RELOC)) \
555 type = SECT_RO, mode = "a"; \
557 type = SECT_RW, mode = "aw"; \
561 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
562 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
563 strcpy (s->name, NAME); \
565 s->next = sections; \
567 fprintf (FILE, "\t.section\t%s,\"%s\",@progbits\n", NAME, mode); \
571 if (DECL && s->type != type) \
572 error_with_decl (DECL, "%s causes a section type conflict"); \
574 fprintf (FILE, "\t.section\t%s\n", NAME); \
578 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
579 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
580 #define UNIQUE_SECTION(DECL,RELOC) \
583 char *name, *string, *prefix; \
585 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
587 if (! DECL_ONE_ONLY (DECL)) \
590 if (TREE_CODE (DECL) == FUNCTION_DECL) \
592 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
593 prefix = ".rodata."; \
597 else if (TREE_CODE (DECL) == FUNCTION_DECL) \
598 prefix = ".gnu.linkonce.t."; \
599 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
600 prefix = ".gnu.linkonce.r."; \
602 prefix = ".gnu.linkonce.d."; \
604 len = strlen (name) + strlen (prefix); \
605 string = alloca (len + 1); \
606 sprintf (string, "%s%s", prefix, name); \
608 DECL_SECTION_NAME (DECL) = build_string (len, string); \
610 /* A C statement (sans semicolon) to output an element in the table of
611 global constructors. */
612 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
615 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
616 assemble_name (FILE, NAME); \
617 fprintf (FILE, "\n"); \
620 /* A C statement (sans semicolon) to output an element in the table of
621 global destructors. */
622 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
625 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
626 assemble_name (FILE, NAME); \
627 fprintf (FILE, "\n"); \
630 /* A C statement or statements to switch to the appropriate
631 section for output of DECL. DECL is either a `VAR_DECL' node
632 or a constant of some sort. RELOC indicates whether forming
633 the initial value of DECL requires link-time relocations. */
635 #define SELECT_SECTION(DECL,RELOC) \
637 if (flag_pic && RELOC) \
639 else if (TREE_CODE (DECL) == STRING_CST) \
641 if (! flag_writable_strings) \
646 else if (TREE_CODE (DECL) == VAR_DECL) \
648 if (! DECL_READONLY_SECTION (DECL, RELOC)) \
657 /* A C statement or statements to switch to the appropriate
658 section for output of RTX in mode MODE. RTX is some kind
659 of constant in RTL. The argument MODE is redundant except
660 in the case of a `const_int' rtx. Currently, these always
661 go into the const section. */
663 #undef SELECT_RTX_SECTION
664 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
666 /* Define the strings used for the special svr4 .type and .size directives.
667 These strings generally do not vary from one system running svr4 to
668 another, but if a given system (e.g. m88k running svr) needs to use
669 different pseudo-op names for these, they may be overridden in the
670 file which includes this one. */
672 #define TYPE_ASM_OP ".type"
673 #define SIZE_ASM_OP ".size"
675 /* This is how we tell the assembler that a symbol is weak. */
677 #define ASM_WEAKEN_LABEL(FILE,NAME) \
678 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
679 fputc ('\n', FILE); } while (0)
681 /* The following macro defines the format used to output the second
682 operand of the .type assembler directive. Different svr4 assemblers
683 expect various different forms for this operand. The one given here
684 is just a default. You may need to override it in your machine-
685 specific tm.h file (depending upon the particulars of your assembler). */
687 #define TYPE_OPERAND_FMT "@%s"
689 /* Write the extra assembler code needed to declare a function's result.
690 Most svr4 assemblers don't require any special declaration of the
691 result value, but there are exceptions. */
693 #ifndef ASM_DECLARE_RESULT
694 #define ASM_DECLARE_RESULT(FILE, RESULT)
697 /* These macros generate the special .type and .size directives which
698 are used to set the corresponding fields of the linker symbol table
699 entries in an ELF object file under SVR4. These macros also output
700 the starting labels for the relevant functions/objects. */
702 /* Write the extra assembler code needed to declare a function properly.
703 Some svr4 assemblers need to also have something extra said about the
704 function's return value. We allow for that here. */
706 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
708 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
709 assemble_name (FILE, NAME); \
711 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
713 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
714 ASM_OUTPUT_LABEL(FILE, NAME); \
717 /* Write the extra assembler code needed to declare an object properly. */
719 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
721 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
722 assemble_name (FILE, NAME); \
724 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
726 size_directive_output = 0; \
727 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
729 size_directive_output = 1; \
730 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
731 assemble_name (FILE, NAME); \
733 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
734 int_size_in_bytes (TREE_TYPE (DECL))); \
735 fputc ('\n', FILE); \
737 ASM_OUTPUT_LABEL(FILE, NAME); \
740 /* Output the size directive for a decl in rest_of_decl_compilation
741 in the case where we did not do so before the initializer.
742 Once we find the error_mark_node, we know that the value of
743 size_directive_output was set
744 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
746 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
748 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
749 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
750 && ! AT_END && TOP_LEVEL \
751 && DECL_INITIAL (DECL) == error_mark_node \
752 && !size_directive_output) \
754 size_directive_output = 1; \
755 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
756 assemble_name (FILE, name); \
758 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
759 int_size_in_bytes (TREE_TYPE (DECL))); \
760 fputc ('\n', FILE); \
764 /* This is how to declare the size of a function. */
766 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
768 if (!flag_inhibit_size_directive) \
771 static int labelno; \
773 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
774 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
775 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
776 assemble_name (FILE, (FNAME)); \
777 fprintf (FILE, ","); \
778 assemble_name (FILE, label); \
779 fprintf (FILE, "-"); \
780 assemble_name (FILE, (FNAME)); \
785 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
786 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
787 corresponds to a particular byte value [0..255]. For any
788 given byte value, if the value in the corresponding table
789 position is zero, the given character can be output directly.
790 If the table value is 1, the byte must be output as a \ooo
791 octal escape. If the tables value is anything else, then the
792 byte value should be output as a \ followed by the value
793 in the table. Note that we can use standard UN*X escape
794 sequences for many control characters, but we don't use
795 \a to represent BEL because some svr4 assemblers (e.g. on
796 the i386) don't know about that. Also, we don't use \v
797 since some versions of gas, such as 2.2 did not accept it. */
800 "\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\
801 \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\
802 \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\
803 \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\
804 \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\
805 \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\
806 \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\
807 \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"
809 /* Some svr4 assemblers have a limit on the number of characters which
810 can appear in the operand of a .string directive. If your assembler
811 has such a limitation, you should define STRING_LIMIT to reflect that
812 limit. Note that at least some svr4 assemblers have a limit on the
813 actual number of bytes in the double-quoted string, and that they
814 count each character in an escape sequence as one byte. Thus, an
815 escape sequence like \377 would count as four bytes.
817 If your target assembler doesn't support the .string directive, you
818 should define this to zero.
821 #define STRING_LIMIT ((unsigned) 256)
823 #define STRING_ASM_OP ".string"
825 /* The routine used to output NUL terminated strings. We use a special
826 version of this for most svr4 targets because doing so makes the
827 generated assembly code more compact (and thus faster to assemble)
828 as well as more readable, especially for targets like the i386
829 (where the only alternative is to output character sequences as
830 comma separated lists of numbers). */
832 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
835 register unsigned char *_limited_str = (unsigned char *) (STR); \
836 register unsigned ch; \
837 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
838 for (; (ch = *_limited_str); _limited_str++) \
840 register int escape; \
841 switch (escape = ESCAPES[ch]) \
847 fprintf ((FILE), "\\%03o", ch); \
850 putc ('\\', (FILE)); \
851 putc (escape, (FILE)); \
855 fprintf ((FILE), "\"\n"); \
859 /* The routine used to output sequences of byte values. We use a special
860 version of this for most svr4 targets because doing so makes the
861 generated assembly code more compact (and thus faster to assemble)
862 as well as more readable. Note that if we find subparts of the
863 character sequence which end with NUL (and which are shorter than
864 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
866 #undef ASM_OUTPUT_ASCII
867 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
870 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
871 register unsigned char *limit = _ascii_bytes + (LENGTH); \
872 register unsigned bytes_in_chunk = 0; \
873 for (; _ascii_bytes < limit; _ascii_bytes++) \
875 register unsigned char *p; \
876 if (bytes_in_chunk >= 60) \
878 fprintf ((FILE), "\"\n"); \
879 bytes_in_chunk = 0; \
881 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
883 if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \
885 if (bytes_in_chunk > 0) \
887 fprintf ((FILE), "\"\n"); \
888 bytes_in_chunk = 0; \
890 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
895 register int escape; \
896 register unsigned ch; \
897 if (bytes_in_chunk == 0) \
898 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
899 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
906 fprintf ((FILE), "\\%03o", ch); \
907 bytes_in_chunk += 4; \
910 putc ('\\', (FILE)); \
911 putc (escape, (FILE)); \
912 bytes_in_chunk += 2; \
917 if (bytes_in_chunk > 0) \
918 fprintf ((FILE), "\"\n"); \
922 /* All SVR4 targets use the ELF object file format. */
923 #define OBJECT_FORMAT_ELF