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