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(LIBGCC_SPEC): Remove.
[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 /* Use DWARF debugging info by default. */
272
273 #ifndef PREFERRED_DEBUGGING_TYPE
274 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
275 #endif
276
277 /* Make LBRAC and RBRAC addresses relative to the start of the
278 function. The native Solaris stabs debugging format works this
279 way, gdb expects it, and it reduces the number of relocation
280 entries. */
281
282 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
283
284 /* When using stabs, gcc2_compiled must be a stabs entry, not an
285 ordinary symbol, or gdb won't see it. The stabs entry must be
286 before the N_SO in order for gdb to find it. */
287
288 #define ASM_IDENTIFY_GCC(FILE) \
289 do \
290 { \
291 if (write_symbols != DBX_DEBUG) \
292 fputs ("gcc2_compiled.:\n", FILE); \
293 else \
294 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
295 } \
296 while (0)
297
298 /* Like block addresses, stabs line numbers are relative to the
299 current function. */
300
301 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
302 do \
303 { \
304 static int sym_lineno = 1; \
305 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
306 line, sym_lineno); \
307 assemble_name (file, \
308 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
309 fprintf (file, "\n.LM%d:\n", sym_lineno); \
310 sym_lineno += 1; \
311 } \
312 while (0)
313
314 /* In order for relative line numbers to work, we must output the
315 stabs entry for the function name first. */
316
317 #define DBX_FUNCTION_FIRST
318
319 /* Generate a blank trailing N_SO to mark the end of the .o file, since
320 we can't depend upon the linker to mark .o file boundaries with
321 embedded stabs. */
322
323 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
324 fprintf (FILE, \
325 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
326
327 /* Define the actual types of some ANSI-mandated types. (These
328 definitions should work for most SVR4 systems). */
329
330 #undef SIZE_TYPE
331 #define SIZE_TYPE "unsigned int"
332
333 #undef PTRDIFF_TYPE
334 #define PTRDIFF_TYPE "int"
335
336 #undef WCHAR_TYPE
337 #define WCHAR_TYPE "long int"
338
339 #undef WCHAR_TYPE_SIZE
340 #define WCHAR_TYPE_SIZE BITS_PER_WORD
341
342 /* This causes trouble, because it requires the host machine
343 to support ANSI C. */
344 /* #define MULTIBYTE_CHARS */
345
346 #undef ASM_BYTE_OP
347 #define ASM_BYTE_OP ".byte"
348
349 #undef SET_ASM_OP
350 #define SET_ASM_OP ".set"
351
352 /* This is how to begin an assembly language file. Most svr4 assemblers want
353 at least a .file directive to come first, and some want to see a .version
354 directive come right after that. Here we just establish a default
355 which generates only the .file directive. If you need a .version
356 directive for any specific target, you should override this definition
357 in the target-specific file which includes this one. */
358
359 #undef ASM_FILE_START
360 #define ASM_FILE_START(FILE) \
361 output_file_directive ((FILE), main_input_filename)
362
363 /* This is how to allocate empty space in some section. The .zero
364 pseudo-op is used for this on most svr4 assemblers. */
365
366 #define SKIP_ASM_OP ".zero"
367
368 #undef ASM_OUTPUT_SKIP
369 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
370 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
371
372 /* This is how to output a reference to a user-level label named NAME.
373 `assemble_name' uses this.
374
375 For System V Release 4 the convention is *not* to prepend a leading
376 underscore onto user-level symbol names. */
377
378 #undef ASM_OUTPUT_LABELREF
379 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
380
381 /* This is how to output an internal numbered label where
382 PREFIX is the class of label and NUM is the number within the class.
383
384 For most svr4 systems, the convention is that any symbol which begins
385 with a period is not put into the linker symbol table by the assembler. */
386
387 #undef ASM_OUTPUT_INTERNAL_LABEL
388 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
389 do { \
390 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
391 } while (0)
392
393 /* This is how to store into the string LABEL
394 the symbol_ref name of an internal numbered label where
395 PREFIX is the class of label and NUM is the number within the class.
396 This is suitable for output with `assemble_name'.
397
398 For most svr4 systems, the convention is that any symbol which begins
399 with a period is not put into the linker symbol table by the assembler. */
400
401 #undef ASM_GENERATE_INTERNAL_LABEL
402 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
403 do { \
404 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
405 } while (0)
406
407 /* Output the label which precedes a jumptable. Note that for all svr4
408 systems where we actually generate jumptables (which is to say every
409 svr4 target except i386, where we use casesi instead) we put the jump-
410 tables into the .rodata section and since other stuff could have been
411 put into the .rodata section prior to any given jumptable, we have to
412 make sure that the location counter for the .rodata section gets pro-
413 perly re-aligned prior to the actual beginning of the jump table. */
414
415 #define ALIGN_ASM_OP ".align"
416
417 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
418 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
419 ASM_OUTPUT_ALIGN ((FILE), 2);
420 #endif
421
422 #undef ASM_OUTPUT_CASE_LABEL
423 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
424 do { \
425 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
426 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
427 } while (0)
428
429 /* The standard SVR4 assembler seems to require that certain builtin
430 library routines (e.g. .udiv) be explicitly declared as .globl
431 in each assembly file where they are referenced. */
432
433 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
434 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
435
436 /* This says how to output assembler code to declare an
437 uninitialized external linkage data object. Under SVR4,
438 the linker seems to want the alignment of data objects
439 to depend on their types. We do exactly that here. */
440
441 #define COMMON_ASM_OP ".comm"
442
443 #undef ASM_OUTPUT_ALIGNED_COMMON
444 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
445 do { \
446 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
447 assemble_name ((FILE), (NAME)); \
448 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
449 } while (0)
450
451 /* This says how to output assembler code to declare an
452 uninitialized internal linkage data object. Under SVR4,
453 the linker seems to want the alignment of data objects
454 to depend on their types. We do exactly that here. */
455
456 #define LOCAL_ASM_OP ".local"
457
458 #undef ASM_OUTPUT_ALIGNED_LOCAL
459 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
460 do { \
461 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
462 assemble_name ((FILE), (NAME)); \
463 fprintf ((FILE), "\n"); \
464 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
465 } while (0)
466
467 /* This is the pseudo-op used to generate a 32-bit word of data with a
468 specific value in some section. This is the same for all known svr4
469 assemblers. */
470
471 #define INT_ASM_OP ".long"
472
473 /* This is the pseudo-op used to generate a contiguous sequence of byte
474 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
475 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
476
477 #undef ASCII_DATA_ASM_OP
478 #define ASCII_DATA_ASM_OP ".ascii"
479
480 /* Support const sections and the ctors and dtors sections for g++.
481 Note that there appears to be two different ways to support const
482 sections at the moment. You can either #define the symbol
483 READONLY_DATA_SECTION (giving it some code which switches to the
484 readonly data section) or else you can #define the symbols
485 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
486 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
487
488 #define USE_CONST_SECTION 1
489
490 #define CONST_SECTION_ASM_OP ".section\t.rodata"
491
492 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
493
494 Note that we want to give these sections the SHF_WRITE attribute
495 because these sections will actually contain data (i.e. tables of
496 addresses of functions in the current root executable or shared library
497 file) and, in the case of a shared library, the relocatable addresses
498 will have to be properly resolved/relocated (and then written into) by
499 the dynamic linker when it actually attaches the given shared library
500 to the executing process. (Note that on SVR4, you may wish to use the
501 `-z text' option to the ELF linker, when building a shared library, as
502 an additional check that you are doing everything right. But if you do
503 use the `-z text' option when building a shared library, you will get
504 errors unless the .ctors and .dtors sections are marked as writable
505 via the SHF_WRITE attribute.) */
506
507 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
508 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
509
510 /* On svr4, we *do* have support for the .init and .fini sections, and we
511 can put stuff in there to be executed before and after `main'. We let
512 crtstuff.c and other files know this by defining the following symbols.
513 The definitions say how to change sections to the .init and .fini
514 sections. This is the same for all known svr4 assemblers. */
515
516 #define INIT_SECTION_ASM_OP ".section\t.init"
517 #define FINI_SECTION_ASM_OP ".section\t.fini"
518
519 /* A default list of other sections which we might be "in" at any given
520 time. For targets that use additional sections (e.g. .tdesc) you
521 should override this definition in the target-specific file which
522 includes this file. */
523
524 #undef EXTRA_SECTIONS
525 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
526
527 /* A default list of extra section function definitions. For targets
528 that use additional sections (e.g. .tdesc) you should override this
529 definition in the target-specific file which includes this file. */
530
531 #undef EXTRA_SECTION_FUNCTIONS
532 #define EXTRA_SECTION_FUNCTIONS \
533 CONST_SECTION_FUNCTION \
534 CTORS_SECTION_FUNCTION \
535 DTORS_SECTION_FUNCTION
536
537 #define READONLY_DATA_SECTION() const_section ()
538
539 extern void text_section ();
540
541 #define CONST_SECTION_FUNCTION \
542 void \
543 const_section () \
544 { \
545 if (!USE_CONST_SECTION) \
546 text_section(); \
547 else if (in_section != in_const) \
548 { \
549 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
550 in_section = in_const; \
551 } \
552 }
553
554 #define CTORS_SECTION_FUNCTION \
555 void \
556 ctors_section () \
557 { \
558 if (in_section != in_ctors) \
559 { \
560 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
561 in_section = in_ctors; \
562 } \
563 }
564
565 #define DTORS_SECTION_FUNCTION \
566 void \
567 dtors_section () \
568 { \
569 if (in_section != in_dtors) \
570 { \
571 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
572 in_section = in_dtors; \
573 } \
574 }
575
576 /* Switch into a generic section.
577 This is currently only used to support section attributes.
578
579 We make the section read-only and executable for a function decl,
580 read-only for a const data decl, and writable for a non-const data decl. */
581 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
582 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \
583 (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
584 (DECL) && TREE_READONLY (DECL) ? "a" : "aw")
585
586
587 /* A C statement (sans semicolon) to output an element in the table of
588 global constructors. */
589 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
590 do { \
591 ctors_section (); \
592 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
593 assemble_name (FILE, NAME); \
594 fprintf (FILE, "\n"); \
595 } while (0)
596
597 /* A C statement (sans semicolon) to output an element in the table of
598 global destructors. */
599 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
600 do { \
601 dtors_section (); \
602 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
603 assemble_name (FILE, NAME); \
604 fprintf (FILE, "\n"); \
605 } while (0)
606
607 /* A C statement or statements to switch to the appropriate
608 section for output of DECL. DECL is either a `VAR_DECL' node
609 or a constant of some sort. RELOC indicates whether forming
610 the initial value of DECL requires link-time relocations. */
611
612 #define SELECT_SECTION(DECL,RELOC) \
613 { \
614 if (TREE_CODE (DECL) == STRING_CST) \
615 { \
616 if (! flag_writable_strings) \
617 const_section (); \
618 else \
619 data_section (); \
620 } \
621 else if (TREE_CODE (DECL) == VAR_DECL) \
622 { \
623 if ((flag_pic && RELOC) \
624 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
625 || !DECL_INITIAL (DECL) \
626 || (DECL_INITIAL (DECL) != error_mark_node \
627 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
628 data_section (); \
629 else \
630 const_section (); \
631 } \
632 else \
633 const_section (); \
634 }
635
636 /* A C statement or statements to switch to the appropriate
637 section for output of RTX in mode MODE. RTX is some kind
638 of constant in RTL. The argument MODE is redundant except
639 in the case of a `const_int' rtx. Currently, these always
640 go into the const section. */
641
642 #undef SELECT_RTX_SECTION
643 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
644
645 /* Define the strings used for the special svr4 .type and .size directives.
646 These strings generally do not vary from one system running svr4 to
647 another, but if a given system (e.g. m88k running svr) needs to use
648 different pseudo-op names for these, they may be overridden in the
649 file which includes this one. */
650
651 #define TYPE_ASM_OP ".type"
652 #define SIZE_ASM_OP ".size"
653
654 /* This is how we tell the assembler that a symbol is weak. */
655
656 #define ASM_WEAKEN_LABEL(FILE,NAME) \
657 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
658 fputc ('\n', FILE); } while (0)
659
660 /* The following macro defines the format used to output the second
661 operand of the .type assembler directive. Different svr4 assemblers
662 expect various different forms for this operand. The one given here
663 is just a default. You may need to override it in your machine-
664 specific tm.h file (depending upon the particulars of your assembler). */
665
666 #define TYPE_OPERAND_FMT "@%s"
667
668 /* Write the extra assembler code needed to declare a function's result.
669 Most svr4 assemblers don't require any special declaration of the
670 result value, but there are exceptions. */
671
672 #ifndef ASM_DECLARE_RESULT
673 #define ASM_DECLARE_RESULT(FILE, RESULT)
674 #endif
675
676 /* These macros generate the special .type and .size directives which
677 are used to set the corresponding fields of the linker symbol table
678 entries in an ELF object file under SVR4. These macros also output
679 the starting labels for the relevant functions/objects. */
680
681 /* Write the extra assembler code needed to declare a function properly.
682 Some svr4 assemblers need to also have something extra said about the
683 function's return value. We allow for that here. */
684
685 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
686 do { \
687 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
688 assemble_name (FILE, NAME); \
689 putc (',', FILE); \
690 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
691 putc ('\n', FILE); \
692 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
693 ASM_OUTPUT_LABEL(FILE, NAME); \
694 } while (0)
695
696 /* Write the extra assembler code needed to declare an object properly. */
697
698 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
699 do { \
700 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
701 assemble_name (FILE, NAME); \
702 putc (',', FILE); \
703 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
704 putc ('\n', FILE); \
705 size_directive_output = 0; \
706 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
707 { \
708 size_directive_output = 1; \
709 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
710 assemble_name (FILE, NAME); \
711 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
712 } \
713 ASM_OUTPUT_LABEL(FILE, NAME); \
714 } while (0)
715
716 /* Output the size directive for a decl in rest_of_decl_compilation
717 in the case where we did not do so before the initializer.
718 Once we find the error_mark_node, we know that the value of
719 size_directive_output was set
720 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
721
722 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
723 do { \
724 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
725 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
726 && ! AT_END && TOP_LEVEL \
727 && DECL_INITIAL (DECL) == error_mark_node \
728 && !size_directive_output) \
729 { \
730 size_directive_output = 1; \
731 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
732 assemble_name (FILE, name); \
733 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
734 } \
735 } while (0)
736
737 /* This is how to declare the size of a function. */
738
739 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
740 do { \
741 if (!flag_inhibit_size_directive) \
742 { \
743 char label[256]; \
744 static int labelno; \
745 labelno++; \
746 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
747 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
748 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
749 assemble_name (FILE, (FNAME)); \
750 fprintf (FILE, ","); \
751 assemble_name (FILE, label); \
752 fprintf (FILE, "-"); \
753 assemble_name (FILE, (FNAME)); \
754 putc ('\n', FILE); \
755 } \
756 } while (0)
757
758 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
759 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
760 corresponds to a particular byte value [0..255]. For any
761 given byte value, if the value in the corresponding table
762 position is zero, the given character can be output directly.
763 If the table value is 1, the byte must be output as a \ooo
764 octal escape. If the tables value is anything else, then the
765 byte value should be output as a \ followed by the value
766 in the table. Note that we can use standard UN*X escape
767 sequences for many control characters, but we don't use
768 \a to represent BEL because some svr4 assemblers (e.g. on
769 the i386) don't know about that. Also, we don't use \v
770 since some versions of gas, such as 2.2 did not accept it. */
771
772 #define ESCAPES \
773 "\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\
774 \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\
775 \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\
776 \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\
777 \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\
778 \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\
779 \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\
780 \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"
781
782 /* Some svr4 assemblers have a limit on the number of characters which
783 can appear in the operand of a .string directive. If your assembler
784 has such a limitation, you should define STRING_LIMIT to reflect that
785 limit. Note that at least some svr4 assemblers have a limit on the
786 actual number of bytes in the double-quoted string, and that they
787 count each character in an escape sequence as one byte. Thus, an
788 escape sequence like \377 would count as four bytes.
789
790 If your target assembler doesn't support the .string directive, you
791 should define this to zero.
792 */
793
794 #define STRING_LIMIT ((unsigned) 256)
795
796 #define STRING_ASM_OP ".string"
797
798 /* The routine used to output NUL terminated strings. We use a special
799 version of this for most svr4 targets because doing so makes the
800 generated assembly code more compact (and thus faster to assemble)
801 as well as more readable, especially for targets like the i386
802 (where the only alternative is to output character sequences as
803 comma separated lists of numbers). */
804
805 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
806 do \
807 { \
808 register unsigned char *_limited_str = (unsigned char *) (STR); \
809 register unsigned ch; \
810 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
811 for (; ch = *_limited_str; _limited_str++) \
812 { \
813 register int escape; \
814 switch (escape = ESCAPES[ch]) \
815 { \
816 case 0: \
817 putc (ch, (FILE)); \
818 break; \
819 case 1: \
820 fprintf ((FILE), "\\%03o", ch); \
821 break; \
822 default: \
823 putc ('\\', (FILE)); \
824 putc (escape, (FILE)); \
825 break; \
826 } \
827 } \
828 fprintf ((FILE), "\"\n"); \
829 } \
830 while (0)
831
832 /* The routine used to output sequences of byte values. We use a special
833 version of this for most svr4 targets because doing so makes the
834 generated assembly code more compact (and thus faster to assemble)
835 as well as more readable. Note that if we find subparts of the
836 character sequence which end with NUL (and which are shorter than
837 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
838
839 #undef ASM_OUTPUT_ASCII
840 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
841 do \
842 { \
843 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
844 register unsigned char *limit = _ascii_bytes + (LENGTH); \
845 register unsigned bytes_in_chunk = 0; \
846 for (; _ascii_bytes < limit; _ascii_bytes++) \
847 { \
848 register unsigned char *p; \
849 if (bytes_in_chunk >= 60) \
850 { \
851 fprintf ((FILE), "\"\n"); \
852 bytes_in_chunk = 0; \
853 } \
854 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
855 continue; \
856 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
857 { \
858 if (bytes_in_chunk > 0) \
859 { \
860 fprintf ((FILE), "\"\n"); \
861 bytes_in_chunk = 0; \
862 } \
863 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
864 _ascii_bytes = p; \
865 } \
866 else \
867 { \
868 register int escape; \
869 register unsigned ch; \
870 if (bytes_in_chunk == 0) \
871 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
872 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
873 { \
874 case 0: \
875 putc (ch, (FILE)); \
876 bytes_in_chunk++; \
877 break; \
878 case 1: \
879 fprintf ((FILE), "\\%03o", ch); \
880 bytes_in_chunk += 4; \
881 break; \
882 default: \
883 putc ('\\', (FILE)); \
884 putc (escape, (FILE)); \
885 bytes_in_chunk += 2; \
886 break; \
887 } \
888 } \
889 } \
890 if (bytes_in_chunk > 0) \
891 fprintf ((FILE), "\"\n"); \
892 } \
893 while (0)
894
895 /* All SVR4 targets use the ELF object file format. */
896 #define OBJECT_FORMAT_ELF
897
898 /* The maximum alignment which the object file format can support.
899 ELF doesn't have a limit, but we've got to override the default
900 (which is BIGGEST_ALIGNMENT). */
901 #define MAX_OFILE_ALIGNMENT 0x10000