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(MAKE_DECL_ONE_ONLY): Fix typo in use of macro parameter.
[gcc.git] / gcc / config / svr4.h
1 /* Operating system specific defines to be used when targeting GCC for some
2 generic System V Release 4 system.
3 Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@monkeys.com).
5
6 This file is part of GNU CC.
7
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)
11 any later version.
12
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.
17
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.
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 -h*, -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 %{!h*:%{o*:-h %*}}} \
166 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
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 %{!h*:%{o*:-h %*}}} \
175 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
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) \
214 do { \
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 /* The numbers used to denote specific machine registers in the System V
249 Release 4 DWARF debugging information are quite likely to be totally
250 different from the numbers used in BSD stabs debugging information
251 for the same kind of target machine. Thus, we undefine the macro
252 DBX_REGISTER_NUMBER here as an extra inducement to get people to
253 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
254 (which is also used to provide DWARF registers numbers in dwarfout.c)
255 in their tm.h files which include this file. */
256
257 #undef DBX_REGISTER_NUMBER
258
259 /* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
260 in general, although it will only work when using gas. */
261
262 #define DBX_DEBUGGING_INFO
263
264 /* When generating stabs debugging, use N_BINCL entries. */
265
266 #define DBX_USE_BINCL
267
268 /* Use DWARF debugging info by default. */
269
270 #ifndef PREFERRED_DEBUGGING_TYPE
271 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
272 #endif
273
274 /* Make LBRAC and RBRAC addresses relative to the start of the
275 function. The native Solaris stabs debugging format works this
276 way, gdb expects it, and it reduces the number of relocation
277 entries. */
278
279 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
280
281 /* When using stabs, gcc2_compiled must be a stabs entry, not an
282 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
283 the input piecemeal, starting with each N_SO, it's a lot easier if
284 the gcc2 flag symbol is *after* the N_SO rather than before it. So
285 we emit an N_OPT stab there. */
286
287 #define ASM_IDENTIFY_GCC(FILE) \
288 do \
289 { \
290 if (write_symbols != DBX_DEBUG) \
291 fputs ("gcc2_compiled.:\n", FILE); \
292 } \
293 while (0)
294
295 #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
296 do \
297 { \
298 if (write_symbols == DBX_DEBUG) \
299 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
300 } \
301 while (0)
302
303 /* Like block addresses, stabs line numbers are relative to the
304 current function. */
305
306 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
307 do \
308 { \
309 static int sym_lineno = 1; \
310 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
311 line, sym_lineno); \
312 assemble_name (file, \
313 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
314 fprintf (file, "\n.LM%d:\n", sym_lineno); \
315 sym_lineno += 1; \
316 } \
317 while (0)
318
319 /* In order for relative line numbers to work, we must output the
320 stabs entry for the function name first. */
321
322 #define DBX_FUNCTION_FIRST
323
324 /* Generate a blank trailing N_SO to mark the end of the .o file, since
325 we can't depend upon the linker to mark .o file boundaries with
326 embedded stabs. */
327
328 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
329 fprintf (FILE, \
330 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
331
332 /* Define the actual types of some ANSI-mandated types. (These
333 definitions should work for most SVR4 systems). */
334
335 #undef SIZE_TYPE
336 #define SIZE_TYPE "unsigned int"
337
338 #undef PTRDIFF_TYPE
339 #define PTRDIFF_TYPE "int"
340
341 #undef WCHAR_TYPE
342 #define WCHAR_TYPE "long int"
343
344 #undef WCHAR_TYPE_SIZE
345 #define WCHAR_TYPE_SIZE BITS_PER_WORD
346
347 /* This causes trouble, because it requires the host machine
348 to support ANSI C. */
349 /* #define MULTIBYTE_CHARS */
350
351 #undef ASM_BYTE_OP
352 #define ASM_BYTE_OP ".byte"
353
354 #undef SET_ASM_OP
355 #define SET_ASM_OP ".set"
356
357 /* This is how to begin an assembly language file. Most svr4 assemblers want
358 at least a .file directive to come first, and some want to see a .version
359 directive come right after that. Here we just establish a default
360 which generates only the .file directive. If you need a .version
361 directive for any specific target, you should override this definition
362 in the target-specific file which includes this one. */
363
364 #undef ASM_FILE_START
365 #define ASM_FILE_START(FILE) \
366 output_file_directive ((FILE), main_input_filename)
367
368 /* This is how to allocate empty space in some section. The .zero
369 pseudo-op is used for this on most svr4 assemblers. */
370
371 #define SKIP_ASM_OP ".zero"
372
373 #undef ASM_OUTPUT_SKIP
374 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
375 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
376
377 /* The prefix to add to user-visible assembler symbols.
378
379 For System V Release 4 the convention is *not* to prepend a leading
380 underscore onto user-level symbol names. */
381
382 #undef USER_LABEL_PREFIX
383 #define USER_LABEL_PREFIX ""
384
385 /* This is how to output an internal numbered label where
386 PREFIX is the class of label and NUM is the number within the class.
387
388 For most svr4 systems, the convention is that any symbol which begins
389 with a period is not put into the linker symbol table by the assembler. */
390
391 #undef ASM_OUTPUT_INTERNAL_LABEL
392 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
393 do { \
394 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
395 } while (0)
396
397 /* This is how to store into the string LABEL
398 the symbol_ref name of an internal numbered label where
399 PREFIX is the class of label and NUM is the number within the class.
400 This is suitable for output with `assemble_name'.
401
402 For most svr4 systems, the convention is that any symbol which begins
403 with a period is not put into the linker symbol table by the assembler. */
404
405 #undef ASM_GENERATE_INTERNAL_LABEL
406 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
407 do { \
408 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
409 } while (0)
410
411 /* Output the label which precedes a jumptable. Note that for all svr4
412 systems where we actually generate jumptables (which is to say every
413 svr4 target except i386, where we use casesi instead) we put the jump-
414 tables into the .rodata section and since other stuff could have been
415 put into the .rodata section prior to any given jumptable, we have to
416 make sure that the location counter for the .rodata section gets pro-
417 perly re-aligned prior to the actual beginning of the jump table. */
418
419 #define ALIGN_ASM_OP ".align"
420
421 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
422 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
423 ASM_OUTPUT_ALIGN ((FILE), 2);
424 #endif
425
426 #undef ASM_OUTPUT_CASE_LABEL
427 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
428 do { \
429 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
430 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
431 } while (0)
432
433 /* The standard SVR4 assembler seems to require that certain builtin
434 library routines (e.g. .udiv) be explicitly declared as .globl
435 in each assembly file where they are referenced. */
436
437 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
438 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
439
440 /* This says how to output assembler code to declare an
441 uninitialized external linkage data object. Under SVR4,
442 the linker seems to want the alignment of data objects
443 to depend on their types. We do exactly that here. */
444
445 #define COMMON_ASM_OP ".comm"
446
447 #undef ASM_OUTPUT_ALIGNED_COMMON
448 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
449 do { \
450 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
451 assemble_name ((FILE), (NAME)); \
452 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
453 } while (0)
454
455 /* This says how to output assembler code to declare an
456 uninitialized internal linkage data object. Under SVR4,
457 the linker seems to want the alignment of data objects
458 to depend on their types. We do exactly that here. */
459
460 #define LOCAL_ASM_OP ".local"
461
462 #undef ASM_OUTPUT_ALIGNED_LOCAL
463 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
464 do { \
465 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
466 assemble_name ((FILE), (NAME)); \
467 fprintf ((FILE), "\n"); \
468 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
469 } while (0)
470
471 /* Biggest alignment supported by the object file format of this
472 machine. Use this macro to limit the alignment which can be
473 specified using the `__attribute__ ((aligned (N)))' construct. If
474 not defined, the default value is `BIGGEST_ALIGNMENT'. */
475
476 #define MAX_OFILE_ALIGNMENT (32768*8)
477
478 /* This is the pseudo-op used to generate a 32-bit word of data with a
479 specific value in some section. This is the same for all known svr4
480 assemblers. */
481
482 #define INT_ASM_OP ".long"
483
484 /* This is the pseudo-op used to generate a contiguous sequence of byte
485 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
486 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
487
488 #undef ASCII_DATA_ASM_OP
489 #define ASCII_DATA_ASM_OP ".ascii"
490
491 /* Support const sections and the ctors and dtors sections for g++.
492 Note that there appears to be two different ways to support const
493 sections at the moment. You can either #define the symbol
494 READONLY_DATA_SECTION (giving it some code which switches to the
495 readonly data section) or else you can #define the symbols
496 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
497 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
498
499 #define USE_CONST_SECTION 1
500
501 #define CONST_SECTION_ASM_OP ".section\t.rodata"
502
503 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
504
505 Note that we want to give these sections the SHF_WRITE attribute
506 because these sections will actually contain data (i.e. tables of
507 addresses of functions in the current root executable or shared library
508 file) and, in the case of a shared library, the relocatable addresses
509 will have to be properly resolved/relocated (and then written into) by
510 the dynamic linker when it actually attaches the given shared library
511 to the executing process. (Note that on SVR4, you may wish to use the
512 `-z text' option to the ELF linker, when building a shared library, as
513 an additional check that you are doing everything right. But if you do
514 use the `-z text' option when building a shared library, you will get
515 errors unless the .ctors and .dtors sections are marked as writable
516 via the SHF_WRITE attribute.) */
517
518 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
519 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
520
521 /* On svr4, we *do* have support for the .init and .fini sections, and we
522 can put stuff in there to be executed before and after `main'. We let
523 crtstuff.c and other files know this by defining the following symbols.
524 The definitions say how to change sections to the .init and .fini
525 sections. This is the same for all known svr4 assemblers. */
526
527 #define INIT_SECTION_ASM_OP ".section\t.init"
528 #define FINI_SECTION_ASM_OP ".section\t.fini"
529
530 /* A default list of other sections which we might be "in" at any given
531 time. For targets that use additional sections (e.g. .tdesc) you
532 should override this definition in the target-specific file which
533 includes this file. */
534
535 #undef EXTRA_SECTIONS
536 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
537
538 /* A default list of extra section function definitions. For targets
539 that use additional sections (e.g. .tdesc) you should override this
540 definition in the target-specific file which includes this file. */
541
542 #undef EXTRA_SECTION_FUNCTIONS
543 #define EXTRA_SECTION_FUNCTIONS \
544 CONST_SECTION_FUNCTION \
545 CTORS_SECTION_FUNCTION \
546 DTORS_SECTION_FUNCTION
547
548 #define READONLY_DATA_SECTION() const_section ()
549
550 extern void text_section ();
551
552 #define CONST_SECTION_FUNCTION \
553 void \
554 const_section () \
555 { \
556 if (!USE_CONST_SECTION) \
557 text_section(); \
558 else if (in_section != in_const) \
559 { \
560 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
561 in_section = in_const; \
562 } \
563 }
564
565 #define CTORS_SECTION_FUNCTION \
566 void \
567 ctors_section () \
568 { \
569 if (in_section != in_ctors) \
570 { \
571 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
572 in_section = in_ctors; \
573 } \
574 }
575
576 #define DTORS_SECTION_FUNCTION \
577 void \
578 dtors_section () \
579 { \
580 if (in_section != in_dtors) \
581 { \
582 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
583 in_section = in_dtors; \
584 } \
585 }
586
587
588 /*
589 * Switch into a generic section.
590 *
591 * We make the section read-only and executable for a function decl,
592 * read-only for a const data decl, and writable for a non-const data decl.
593 *
594 * If the section has already been defined, we must not
595 * emit the attributes here. The SVR4 assembler does not
596 * recognize section redefinitions.
597 * If DECL is NULL, no attributes are emitted.
598 */
599 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
600 do { \
601 static struct section_info \
602 { \
603 struct section_info *next; \
604 char *name; \
605 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
606 } *sections; \
607 struct section_info *s; \
608 char *mode; \
609 enum sect_enum type; \
610 \
611 for (s = sections; s; s = s->next) \
612 if (!strcmp (NAME, s->name)) \
613 break; \
614 \
615 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
616 type = SECT_EXEC, mode = "ax"; \
617 else if (DECL && TREE_READONLY (DECL)) \
618 type = SECT_RO, mode = "a"; \
619 else \
620 type = SECT_RW, mode = "aw"; \
621 \
622 if (s == 0) \
623 { \
624 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
625 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
626 strcpy (s->name, NAME); \
627 s->type = type; \
628 s->next = sections; \
629 sections = s; \
630 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \
631 } \
632 else \
633 { \
634 if (DECL && s->type != type) \
635 error_with_decl (DECL, "%s causes a section type conflict"); \
636 \
637 fprintf (FILE, ".section\t%s\n", NAME); \
638 } \
639 } while (0)
640
641 /* A C statement (sans semicolon) to mark DECL to be emitted as a
642 public symbol such that extra copies in multiple translation units will
643 be discarded by the linker. */
644 #define MAKE_DECL_ONE_ONLY(DECL) \
645 do { \
646 int len; \
647 char *name, *string, *prefix; \
648 \
649 DECL_WEAK (DECL) = 1; \
650 \
651 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
652 \
653 if (TREE_CODE (DECL) == FUNCTION_DECL) \
654 prefix = ".gnu.linkonce.t."; \
655 else if (TREE_READONLY (DECL)) \
656 prefix = ".gnu.linkonce.r."; \
657 else \
658 prefix = ".gnu.linkonce.d."; \
659 \
660 len = strlen (name) + strlen (prefix); \
661 string = alloca (len + 1); \
662 sprintf (string, "%s%s", prefix, name); \
663 \
664 DECL_SECTION_NAME (DECL) = build_string (len, string); \
665 } while (0)
666
667 /* A C statement (sans semicolon) to output an element in the table of
668 global constructors. */
669 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
670 do { \
671 ctors_section (); \
672 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
673 assemble_name (FILE, NAME); \
674 fprintf (FILE, "\n"); \
675 } while (0)
676
677 /* A C statement (sans semicolon) to output an element in the table of
678 global destructors. */
679 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
680 do { \
681 dtors_section (); \
682 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
683 assemble_name (FILE, NAME); \
684 fprintf (FILE, "\n"); \
685 } while (0)
686
687 /* A C statement or statements to switch to the appropriate
688 section for output of DECL. DECL is either a `VAR_DECL' node
689 or a constant of some sort. RELOC indicates whether forming
690 the initial value of DECL requires link-time relocations. */
691
692 #define SELECT_SECTION(DECL,RELOC) \
693 { \
694 if (flag_pic && RELOC) \
695 data_section (); \
696 else if (TREE_CODE (DECL) == STRING_CST) \
697 { \
698 if (! flag_writable_strings) \
699 const_section (); \
700 else \
701 data_section (); \
702 } \
703 else if (TREE_CODE (DECL) == VAR_DECL) \
704 { \
705 if (!TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
706 || !DECL_INITIAL (DECL) \
707 || (DECL_INITIAL (DECL) != error_mark_node \
708 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
709 data_section (); \
710 else \
711 const_section (); \
712 } \
713 else \
714 const_section (); \
715 }
716
717 /* A C statement or statements to switch to the appropriate
718 section for output of RTX in mode MODE. RTX is some kind
719 of constant in RTL. The argument MODE is redundant except
720 in the case of a `const_int' rtx. Currently, these always
721 go into the const section. */
722
723 #undef SELECT_RTX_SECTION
724 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
725
726 /* Define the strings used for the special svr4 .type and .size directives.
727 These strings generally do not vary from one system running svr4 to
728 another, but if a given system (e.g. m88k running svr) needs to use
729 different pseudo-op names for these, they may be overridden in the
730 file which includes this one. */
731
732 #define TYPE_ASM_OP ".type"
733 #define SIZE_ASM_OP ".size"
734
735 /* This is how we tell the assembler that a symbol is weak. */
736
737 #define ASM_WEAKEN_LABEL(FILE,NAME) \
738 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
739 fputc ('\n', FILE); } while (0)
740
741 /* The following macro defines the format used to output the second
742 operand of the .type assembler directive. Different svr4 assemblers
743 expect various different forms for this operand. The one given here
744 is just a default. You may need to override it in your machine-
745 specific tm.h file (depending upon the particulars of your assembler). */
746
747 #define TYPE_OPERAND_FMT "@%s"
748
749 /* Write the extra assembler code needed to declare a function's result.
750 Most svr4 assemblers don't require any special declaration of the
751 result value, but there are exceptions. */
752
753 #ifndef ASM_DECLARE_RESULT
754 #define ASM_DECLARE_RESULT(FILE, RESULT)
755 #endif
756
757 /* These macros generate the special .type and .size directives which
758 are used to set the corresponding fields of the linker symbol table
759 entries in an ELF object file under SVR4. These macros also output
760 the starting labels for the relevant functions/objects. */
761
762 /* Write the extra assembler code needed to declare a function properly.
763 Some svr4 assemblers need to also have something extra said about the
764 function's return value. We allow for that here. */
765
766 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
767 do { \
768 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
769 assemble_name (FILE, NAME); \
770 putc (',', FILE); \
771 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
772 putc ('\n', FILE); \
773 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
774 ASM_OUTPUT_LABEL(FILE, NAME); \
775 } while (0)
776
777 /* Write the extra assembler code needed to declare an object properly. */
778
779 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
780 do { \
781 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
782 assemble_name (FILE, NAME); \
783 putc (',', FILE); \
784 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
785 putc ('\n', FILE); \
786 size_directive_output = 0; \
787 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
788 { \
789 size_directive_output = 1; \
790 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
791 assemble_name (FILE, NAME); \
792 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
793 } \
794 ASM_OUTPUT_LABEL(FILE, NAME); \
795 } while (0)
796
797 /* Output the size directive for a decl in rest_of_decl_compilation
798 in the case where we did not do so before the initializer.
799 Once we find the error_mark_node, we know that the value of
800 size_directive_output was set
801 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
802
803 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
804 do { \
805 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
806 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
807 && ! AT_END && TOP_LEVEL \
808 && DECL_INITIAL (DECL) == error_mark_node \
809 && !size_directive_output) \
810 { \
811 size_directive_output = 1; \
812 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
813 assemble_name (FILE, name); \
814 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
815 } \
816 } while (0)
817
818 /* This is how to declare the size of a function. */
819
820 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
821 do { \
822 if (!flag_inhibit_size_directive) \
823 { \
824 char label[256]; \
825 static int labelno; \
826 labelno++; \
827 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
828 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
829 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
830 assemble_name (FILE, (FNAME)); \
831 fprintf (FILE, ","); \
832 assemble_name (FILE, label); \
833 fprintf (FILE, "-"); \
834 assemble_name (FILE, (FNAME)); \
835 putc ('\n', FILE); \
836 } \
837 } while (0)
838
839 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
840 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
841 corresponds to a particular byte value [0..255]. For any
842 given byte value, if the value in the corresponding table
843 position is zero, the given character can be output directly.
844 If the table value is 1, the byte must be output as a \ooo
845 octal escape. If the tables value is anything else, then the
846 byte value should be output as a \ followed by the value
847 in the table. Note that we can use standard UN*X escape
848 sequences for many control characters, but we don't use
849 \a to represent BEL because some svr4 assemblers (e.g. on
850 the i386) don't know about that. Also, we don't use \v
851 since some versions of gas, such as 2.2 did not accept it. */
852
853 #define ESCAPES \
854 "\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\
855 \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\
856 \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\
857 \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\
858 \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\
859 \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\
860 \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\
861 \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"
862
863 /* Some svr4 assemblers have a limit on the number of characters which
864 can appear in the operand of a .string directive. If your assembler
865 has such a limitation, you should define STRING_LIMIT to reflect that
866 limit. Note that at least some svr4 assemblers have a limit on the
867 actual number of bytes in the double-quoted string, and that they
868 count each character in an escape sequence as one byte. Thus, an
869 escape sequence like \377 would count as four bytes.
870
871 If your target assembler doesn't support the .string directive, you
872 should define this to zero.
873 */
874
875 #define STRING_LIMIT ((unsigned) 256)
876
877 #define STRING_ASM_OP ".string"
878
879 /* The routine used to output NUL terminated strings. We use a special
880 version of this for most svr4 targets because doing so makes the
881 generated assembly code more compact (and thus faster to assemble)
882 as well as more readable, especially for targets like the i386
883 (where the only alternative is to output character sequences as
884 comma separated lists of numbers). */
885
886 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
887 do \
888 { \
889 register unsigned char *_limited_str = (unsigned char *) (STR); \
890 register unsigned ch; \
891 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
892 for (; ch = *_limited_str; _limited_str++) \
893 { \
894 register int escape; \
895 switch (escape = ESCAPES[ch]) \
896 { \
897 case 0: \
898 putc (ch, (FILE)); \
899 break; \
900 case 1: \
901 fprintf ((FILE), "\\%03o", ch); \
902 break; \
903 default: \
904 putc ('\\', (FILE)); \
905 putc (escape, (FILE)); \
906 break; \
907 } \
908 } \
909 fprintf ((FILE), "\"\n"); \
910 } \
911 while (0)
912
913 /* The routine used to output sequences of byte values. We use a special
914 version of this for most svr4 targets because doing so makes the
915 generated assembly code more compact (and thus faster to assemble)
916 as well as more readable. Note that if we find subparts of the
917 character sequence which end with NUL (and which are shorter than
918 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
919
920 #undef ASM_OUTPUT_ASCII
921 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
922 do \
923 { \
924 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
925 register unsigned char *limit = _ascii_bytes + (LENGTH); \
926 register unsigned bytes_in_chunk = 0; \
927 for (; _ascii_bytes < limit; _ascii_bytes++) \
928 { \
929 register unsigned char *p; \
930 if (bytes_in_chunk >= 60) \
931 { \
932 fprintf ((FILE), "\"\n"); \
933 bytes_in_chunk = 0; \
934 } \
935 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
936 continue; \
937 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
938 { \
939 if (bytes_in_chunk > 0) \
940 { \
941 fprintf ((FILE), "\"\n"); \
942 bytes_in_chunk = 0; \
943 } \
944 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
945 _ascii_bytes = p; \
946 } \
947 else \
948 { \
949 register int escape; \
950 register unsigned ch; \
951 if (bytes_in_chunk == 0) \
952 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
953 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
954 { \
955 case 0: \
956 putc (ch, (FILE)); \
957 bytes_in_chunk++; \
958 break; \
959 case 1: \
960 fprintf ((FILE), "\\%03o", ch); \
961 bytes_in_chunk += 4; \
962 break; \
963 default: \
964 putc ('\\', (FILE)); \
965 putc (escape, (FILE)); \
966 bytes_in_chunk += 2; \
967 break; \
968 } \
969 } \
970 } \
971 if (bytes_in_chunk > 0) \
972 fprintf ((FILE), "\"\n"); \
973 } \
974 while (0)
975
976 /* All SVR4 targets use the ELF object file format. */
977 #define OBJECT_FORMAT_ELF