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[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 /* All ELF targets can support DWARF-2. */
249
250 #define DWARF2_DEBUGGING_INFO
251
252 /* The numbers used to denote specific machine registers in the System V
253 Release 4 DWARF debugging information are quite likely to be totally
254 different from the numbers used in BSD stabs debugging information
255 for the same kind of target machine. Thus, we undefine the macro
256 DBX_REGISTER_NUMBER here as an extra inducement to get people to
257 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
258 (which is also used to provide DWARF registers numbers in dwarfout.c)
259 in their tm.h files which include this file. */
260
261 #undef DBX_REGISTER_NUMBER
262
263 /* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
264 in general, although it will only work when using gas. */
265
266 #define DBX_DEBUGGING_INFO
267
268 /* When generating stabs debugging, use N_BINCL entries. */
269
270 #define DBX_USE_BINCL
271
272 /* Use DWARF debugging info by default. */
273
274 #ifndef PREFERRED_DEBUGGING_TYPE
275 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
276 #endif
277
278 /* Make LBRAC and RBRAC addresses relative to the start of the
279 function. The native Solaris stabs debugging format works this
280 way, gdb expects it, and it reduces the number of relocation
281 entries. */
282
283 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
284
285 /* When using stabs, gcc2_compiled must be a stabs entry, not an
286 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
287 the input piecemeal, starting with each N_SO, it's a lot easier if
288 the gcc2 flag symbol is *after* the N_SO rather than before it. So
289 we emit an N_OPT stab there. */
290
291 #define ASM_IDENTIFY_GCC(FILE) \
292 do \
293 { \
294 if (write_symbols != DBX_DEBUG) \
295 fputs ("gcc2_compiled.:\n", FILE); \
296 } \
297 while (0)
298
299 #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
300 do \
301 { \
302 if (write_symbols == DBX_DEBUG) \
303 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
304 } \
305 while (0)
306
307 /* Like block addresses, stabs line numbers are relative to the
308 current function. */
309
310 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
311 do \
312 { \
313 static int sym_lineno = 1; \
314 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
315 line, sym_lineno); \
316 assemble_name (file, \
317 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
318 fprintf (file, "\n.LM%d:\n", sym_lineno); \
319 sym_lineno += 1; \
320 } \
321 while (0)
322
323 /* In order for relative line numbers to work, we must output the
324 stabs entry for the function name first. */
325
326 #define DBX_FUNCTION_FIRST
327
328 /* Generate a blank trailing N_SO to mark the end of the .o file, since
329 we can't depend upon the linker to mark .o file boundaries with
330 embedded stabs. */
331
332 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
333 fprintf (FILE, \
334 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
335
336 /* Define the actual types of some ANSI-mandated types. (These
337 definitions should work for most SVR4 systems). */
338
339 #undef SIZE_TYPE
340 #define SIZE_TYPE "unsigned int"
341
342 #undef PTRDIFF_TYPE
343 #define PTRDIFF_TYPE "int"
344
345 #undef WCHAR_TYPE
346 #define WCHAR_TYPE "long int"
347
348 #undef WCHAR_TYPE_SIZE
349 #define WCHAR_TYPE_SIZE BITS_PER_WORD
350
351 /* This causes trouble, because it requires the host machine
352 to support ANSI C. */
353 /* #define MULTIBYTE_CHARS */
354
355 #undef ASM_BYTE_OP
356 #define ASM_BYTE_OP ".byte"
357
358 #undef SET_ASM_OP
359 #define SET_ASM_OP ".set"
360
361 /* This is how to begin an assembly language file. Most svr4 assemblers want
362 at least a .file directive to come first, and some want to see a .version
363 directive come right after that. Here we just establish a default
364 which generates only the .file directive. If you need a .version
365 directive for any specific target, you should override this definition
366 in the target-specific file which includes this one. */
367
368 #undef ASM_FILE_START
369 #define ASM_FILE_START(FILE) \
370 output_file_directive ((FILE), main_input_filename)
371
372 /* This is how to allocate empty space in some section. The .zero
373 pseudo-op is used for this on most svr4 assemblers. */
374
375 #define SKIP_ASM_OP ".zero"
376
377 #undef ASM_OUTPUT_SKIP
378 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
379 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
380
381 /* The prefix to add to user-visible assembler symbols.
382
383 For System V Release 4 the convention is *not* to prepend a leading
384 underscore onto user-level symbol names. */
385
386 #undef USER_LABEL_PREFIX
387 #define USER_LABEL_PREFIX ""
388
389 /* This is how to output an internal numbered label where
390 PREFIX is the class of label and NUM is the number within the class.
391
392 For most svr4 systems, the convention is that any symbol which begins
393 with a period is not put into the linker symbol table by the assembler. */
394
395 #undef ASM_OUTPUT_INTERNAL_LABEL
396 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
397 do { \
398 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
399 } while (0)
400
401 /* This is how to store into the string LABEL
402 the symbol_ref name of an internal numbered label where
403 PREFIX is the class of label and NUM is the number within the class.
404 This is suitable for output with `assemble_name'.
405
406 For most svr4 systems, the convention is that any symbol which begins
407 with a period is not put into the linker symbol table by the assembler. */
408
409 #undef ASM_GENERATE_INTERNAL_LABEL
410 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
411 do { \
412 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
413 } while (0)
414
415 /* Output the label which precedes a jumptable. Note that for all svr4
416 systems where we actually generate jumptables (which is to say every
417 svr4 target except i386, where we use casesi instead) we put the jump-
418 tables into the .rodata section and since other stuff could have been
419 put into the .rodata section prior to any given jumptable, we have to
420 make sure that the location counter for the .rodata section gets pro-
421 perly re-aligned prior to the actual beginning of the jump table. */
422
423 #define ALIGN_ASM_OP ".align"
424
425 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
426 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
427 ASM_OUTPUT_ALIGN ((FILE), 2);
428 #endif
429
430 #undef ASM_OUTPUT_CASE_LABEL
431 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
432 do { \
433 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
434 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
435 } while (0)
436
437 /* The standard SVR4 assembler seems to require that certain builtin
438 library routines (e.g. .udiv) be explicitly declared as .globl
439 in each assembly file where they are referenced. */
440
441 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
442 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
443
444 /* This says how to output assembler code to declare an
445 uninitialized external linkage data object. Under SVR4,
446 the linker seems to want the alignment of data objects
447 to depend on their types. We do exactly that here. */
448
449 #define COMMON_ASM_OP ".comm"
450
451 #undef ASM_OUTPUT_ALIGNED_COMMON
452 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
453 do { \
454 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
455 assemble_name ((FILE), (NAME)); \
456 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
457 } while (0)
458
459 /* This says how to output assembler code to declare an
460 uninitialized internal linkage data object. Under SVR4,
461 the linker seems to want the alignment of data objects
462 to depend on their types. We do exactly that here. */
463
464 #define LOCAL_ASM_OP ".local"
465
466 #undef ASM_OUTPUT_ALIGNED_LOCAL
467 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
468 do { \
469 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
470 assemble_name ((FILE), (NAME)); \
471 fprintf ((FILE), "\n"); \
472 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
473 } while (0)
474
475 /* Biggest alignment supported by the object file format of this
476 machine. Use this macro to limit the alignment which can be
477 specified using the `__attribute__ ((aligned (N)))' construct. If
478 not defined, the default value is `BIGGEST_ALIGNMENT'. */
479
480 #define MAX_OFILE_ALIGNMENT (32768*8)
481
482 /* This is the pseudo-op used to generate a 32-bit word of data with a
483 specific value in some section. This is the same for all known svr4
484 assemblers. */
485
486 #define INT_ASM_OP ".long"
487
488 /* This is the pseudo-op used to generate a contiguous sequence of byte
489 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
490 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
491
492 #undef ASCII_DATA_ASM_OP
493 #define ASCII_DATA_ASM_OP ".ascii"
494
495 /* Support const sections and the ctors and dtors sections for g++.
496 Note that there appears to be two different ways to support const
497 sections at the moment. You can either #define the symbol
498 READONLY_DATA_SECTION (giving it some code which switches to the
499 readonly data section) or else you can #define the symbols
500 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
501 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
502
503 #define USE_CONST_SECTION 1
504
505 #define CONST_SECTION_ASM_OP ".section\t.rodata"
506
507 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
508
509 Note that we want to give these sections the SHF_WRITE attribute
510 because these sections will actually contain data (i.e. tables of
511 addresses of functions in the current root executable or shared library
512 file) and, in the case of a shared library, the relocatable addresses
513 will have to be properly resolved/relocated (and then written into) by
514 the dynamic linker when it actually attaches the given shared library
515 to the executing process. (Note that on SVR4, you may wish to use the
516 `-z text' option to the ELF linker, when building a shared library, as
517 an additional check that you are doing everything right. But if you do
518 use the `-z text' option when building a shared library, you will get
519 errors unless the .ctors and .dtors sections are marked as writable
520 via the SHF_WRITE attribute.) */
521
522 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
523 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
524
525 /* On svr4, we *do* have support for the .init and .fini sections, and we
526 can put stuff in there to be executed before and after `main'. We let
527 crtstuff.c and other files know this by defining the following symbols.
528 The definitions say how to change sections to the .init and .fini
529 sections. This is the same for all known svr4 assemblers. */
530
531 #define INIT_SECTION_ASM_OP ".section\t.init"
532 #define FINI_SECTION_ASM_OP ".section\t.fini"
533
534 /* A default list of other sections which we might be "in" at any given
535 time. For targets that use additional sections (e.g. .tdesc) you
536 should override this definition in the target-specific file which
537 includes this file. */
538
539 #undef EXTRA_SECTIONS
540 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
541
542 /* A default list of extra section function definitions. For targets
543 that use additional sections (e.g. .tdesc) you should override this
544 definition in the target-specific file which includes this file. */
545
546 #undef EXTRA_SECTION_FUNCTIONS
547 #define EXTRA_SECTION_FUNCTIONS \
548 CONST_SECTION_FUNCTION \
549 CTORS_SECTION_FUNCTION \
550 DTORS_SECTION_FUNCTION
551
552 #define READONLY_DATA_SECTION() const_section ()
553
554 extern void text_section ();
555
556 #define CONST_SECTION_FUNCTION \
557 void \
558 const_section () \
559 { \
560 if (!USE_CONST_SECTION) \
561 text_section(); \
562 else if (in_section != in_const) \
563 { \
564 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
565 in_section = in_const; \
566 } \
567 }
568
569 #define CTORS_SECTION_FUNCTION \
570 void \
571 ctors_section () \
572 { \
573 if (in_section != in_ctors) \
574 { \
575 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
576 in_section = in_ctors; \
577 } \
578 }
579
580 #define DTORS_SECTION_FUNCTION \
581 void \
582 dtors_section () \
583 { \
584 if (in_section != in_dtors) \
585 { \
586 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
587 in_section = in_dtors; \
588 } \
589 }
590
591
592 /*
593 * Switch into a generic section.
594 *
595 * We make the section read-only and executable for a function decl,
596 * read-only for a const data decl, and writable for a non-const data decl.
597 *
598 * If the section has already been defined, we must not
599 * emit the attributes here. The SVR4 assembler does not
600 * recognize section redefinitions.
601 * If DECL is NULL, no attributes are emitted.
602 */
603 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
604 do { \
605 static struct section_info \
606 { \
607 struct section_info *next; \
608 char *name; \
609 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
610 } *sections; \
611 struct section_info *s; \
612 char *mode; \
613 enum sect_enum type; \
614 \
615 for (s = sections; s; s = s->next) \
616 if (!strcmp (NAME, s->name)) \
617 break; \
618 \
619 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
620 type = SECT_EXEC, mode = "ax"; \
621 else if (DECL && TREE_READONLY (DECL)) \
622 type = SECT_RO, mode = "a"; \
623 else \
624 type = SECT_RW, mode = "aw"; \
625 \
626 if (s == 0) \
627 { \
628 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
629 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
630 strcpy (s->name, NAME); \
631 s->type = type; \
632 s->next = sections; \
633 sections = s; \
634 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \
635 } \
636 else \
637 { \
638 if (DECL && s->type != type) \
639 error_with_decl (DECL, "%s causes a section type conflict"); \
640 \
641 fprintf (FILE, ".section\t%s\n", NAME); \
642 } \
643 } while (0)
644
645 /* A C statement (sans semicolon) to mark DECL to be emitted as a
646 public symbol such that extra copies in multiple translation units will
647 be discarded by the linker. */
648 #define MAKE_DECL_ONE_ONLY(DECL) \
649 do { \
650 int len; \
651 char *name, *string, *prefix; \
652 \
653 DECL_WEAK (DECL) = 1; \
654 \
655 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
656 \
657 if (TREE_CODE (DECL) == FUNCTION_DECL) \
658 prefix = ".gnu.linkonce.t."; \
659 else if (TREE_READONLY (DECL)) \
660 prefix = ".gnu.linkonce.r."; \
661 else \
662 prefix = ".gnu.linkonce.d."; \
663 \
664 len = strlen (name) + strlen (prefix); \
665 string = alloca (len + 1); \
666 sprintf (string, "%s%s", prefix, name); \
667 \
668 DECL_SECTION_NAME (DECL) = build_string (len, string); \
669 } while (0)
670
671 /* A C statement (sans semicolon) to output an element in the table of
672 global constructors. */
673 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
674 do { \
675 ctors_section (); \
676 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
677 assemble_name (FILE, NAME); \
678 fprintf (FILE, "\n"); \
679 } while (0)
680
681 /* A C statement (sans semicolon) to output an element in the table of
682 global destructors. */
683 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
684 do { \
685 dtors_section (); \
686 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
687 assemble_name (FILE, NAME); \
688 fprintf (FILE, "\n"); \
689 } while (0)
690
691 /* A C statement or statements to switch to the appropriate
692 section for output of DECL. DECL is either a `VAR_DECL' node
693 or a constant of some sort. RELOC indicates whether forming
694 the initial value of DECL requires link-time relocations. */
695
696 #define SELECT_SECTION(DECL,RELOC) \
697 { \
698 if (flag_pic && RELOC) \
699 data_section (); \
700 else if (TREE_CODE (DECL) == STRING_CST) \
701 { \
702 if (! flag_writable_strings) \
703 const_section (); \
704 else \
705 data_section (); \
706 } \
707 else if (TREE_CODE (DECL) == VAR_DECL) \
708 { \
709 if (!TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
710 || !DECL_INITIAL (DECL) \
711 || (DECL_INITIAL (DECL) != error_mark_node \
712 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
713 data_section (); \
714 else \
715 const_section (); \
716 } \
717 else \
718 const_section (); \
719 }
720
721 /* A C statement or statements to switch to the appropriate
722 section for output of RTX in mode MODE. RTX is some kind
723 of constant in RTL. The argument MODE is redundant except
724 in the case of a `const_int' rtx. Currently, these always
725 go into the const section. */
726
727 #undef SELECT_RTX_SECTION
728 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
729
730 /* Define the strings used for the special svr4 .type and .size directives.
731 These strings generally do not vary from one system running svr4 to
732 another, but if a given system (e.g. m88k running svr) needs to use
733 different pseudo-op names for these, they may be overridden in the
734 file which includes this one. */
735
736 #define TYPE_ASM_OP ".type"
737 #define SIZE_ASM_OP ".size"
738
739 /* This is how we tell the assembler that a symbol is weak. */
740
741 #define ASM_WEAKEN_LABEL(FILE,NAME) \
742 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
743 fputc ('\n', FILE); } while (0)
744
745 /* The following macro defines the format used to output the second
746 operand of the .type assembler directive. Different svr4 assemblers
747 expect various different forms for this operand. The one given here
748 is just a default. You may need to override it in your machine-
749 specific tm.h file (depending upon the particulars of your assembler). */
750
751 #define TYPE_OPERAND_FMT "@%s"
752
753 /* Write the extra assembler code needed to declare a function's result.
754 Most svr4 assemblers don't require any special declaration of the
755 result value, but there are exceptions. */
756
757 #ifndef ASM_DECLARE_RESULT
758 #define ASM_DECLARE_RESULT(FILE, RESULT)
759 #endif
760
761 /* These macros generate the special .type and .size directives which
762 are used to set the corresponding fields of the linker symbol table
763 entries in an ELF object file under SVR4. These macros also output
764 the starting labels for the relevant functions/objects. */
765
766 /* Write the extra assembler code needed to declare a function properly.
767 Some svr4 assemblers need to also have something extra said about the
768 function's return value. We allow for that here. */
769
770 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
771 do { \
772 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
773 assemble_name (FILE, NAME); \
774 putc (',', FILE); \
775 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
776 putc ('\n', FILE); \
777 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
778 ASM_OUTPUT_LABEL(FILE, NAME); \
779 } while (0)
780
781 /* Write the extra assembler code needed to declare an object properly. */
782
783 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
784 do { \
785 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
786 assemble_name (FILE, NAME); \
787 putc (',', FILE); \
788 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
789 putc ('\n', FILE); \
790 size_directive_output = 0; \
791 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
792 { \
793 size_directive_output = 1; \
794 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
795 assemble_name (FILE, NAME); \
796 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
797 } \
798 ASM_OUTPUT_LABEL(FILE, NAME); \
799 } while (0)
800
801 /* Output the size directive for a decl in rest_of_decl_compilation
802 in the case where we did not do so before the initializer.
803 Once we find the error_mark_node, we know that the value of
804 size_directive_output was set
805 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
806
807 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
808 do { \
809 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
810 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
811 && ! AT_END && TOP_LEVEL \
812 && DECL_INITIAL (DECL) == error_mark_node \
813 && !size_directive_output) \
814 { \
815 size_directive_output = 1; \
816 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
817 assemble_name (FILE, name); \
818 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
819 } \
820 } while (0)
821
822 /* This is how to declare the size of a function. */
823
824 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
825 do { \
826 if (!flag_inhibit_size_directive) \
827 { \
828 char label[256]; \
829 static int labelno; \
830 labelno++; \
831 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
832 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
833 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
834 assemble_name (FILE, (FNAME)); \
835 fprintf (FILE, ","); \
836 assemble_name (FILE, label); \
837 fprintf (FILE, "-"); \
838 assemble_name (FILE, (FNAME)); \
839 putc ('\n', FILE); \
840 } \
841 } while (0)
842
843 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
844 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
845 corresponds to a particular byte value [0..255]. For any
846 given byte value, if the value in the corresponding table
847 position is zero, the given character can be output directly.
848 If the table value is 1, the byte must be output as a \ooo
849 octal escape. If the tables value is anything else, then the
850 byte value should be output as a \ followed by the value
851 in the table. Note that we can use standard UN*X escape
852 sequences for many control characters, but we don't use
853 \a to represent BEL because some svr4 assemblers (e.g. on
854 the i386) don't know about that. Also, we don't use \v
855 since some versions of gas, such as 2.2 did not accept it. */
856
857 #define ESCAPES \
858 "\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\
859 \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\
860 \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\
861 \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\
862 \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\
863 \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\
864 \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\
865 \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"
866
867 /* Some svr4 assemblers have a limit on the number of characters which
868 can appear in the operand of a .string directive. If your assembler
869 has such a limitation, you should define STRING_LIMIT to reflect that
870 limit. Note that at least some svr4 assemblers have a limit on the
871 actual number of bytes in the double-quoted string, and that they
872 count each character in an escape sequence as one byte. Thus, an
873 escape sequence like \377 would count as four bytes.
874
875 If your target assembler doesn't support the .string directive, you
876 should define this to zero.
877 */
878
879 #define STRING_LIMIT ((unsigned) 256)
880
881 #define STRING_ASM_OP ".string"
882
883 /* The routine used to output NUL terminated strings. We use a special
884 version of this for most svr4 targets because doing so makes the
885 generated assembly code more compact (and thus faster to assemble)
886 as well as more readable, especially for targets like the i386
887 (where the only alternative is to output character sequences as
888 comma separated lists of numbers). */
889
890 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
891 do \
892 { \
893 register unsigned char *_limited_str = (unsigned char *) (STR); \
894 register unsigned ch; \
895 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
896 for (; ch = *_limited_str; _limited_str++) \
897 { \
898 register int escape; \
899 switch (escape = ESCAPES[ch]) \
900 { \
901 case 0: \
902 putc (ch, (FILE)); \
903 break; \
904 case 1: \
905 fprintf ((FILE), "\\%03o", ch); \
906 break; \
907 default: \
908 putc ('\\', (FILE)); \
909 putc (escape, (FILE)); \
910 break; \
911 } \
912 } \
913 fprintf ((FILE), "\"\n"); \
914 } \
915 while (0)
916
917 /* The routine used to output sequences of byte values. We use a special
918 version of this for most svr4 targets because doing so makes the
919 generated assembly code more compact (and thus faster to assemble)
920 as well as more readable. Note that if we find subparts of the
921 character sequence which end with NUL (and which are shorter than
922 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
923
924 #undef ASM_OUTPUT_ASCII
925 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
926 do \
927 { \
928 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
929 register unsigned char *limit = _ascii_bytes + (LENGTH); \
930 register unsigned bytes_in_chunk = 0; \
931 for (; _ascii_bytes < limit; _ascii_bytes++) \
932 { \
933 register unsigned char *p; \
934 if (bytes_in_chunk >= 60) \
935 { \
936 fprintf ((FILE), "\"\n"); \
937 bytes_in_chunk = 0; \
938 } \
939 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
940 continue; \
941 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
942 { \
943 if (bytes_in_chunk > 0) \
944 { \
945 fprintf ((FILE), "\"\n"); \
946 bytes_in_chunk = 0; \
947 } \
948 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
949 _ascii_bytes = p; \
950 } \
951 else \
952 { \
953 register int escape; \
954 register unsigned ch; \
955 if (bytes_in_chunk == 0) \
956 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
957 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
958 { \
959 case 0: \
960 putc (ch, (FILE)); \
961 bytes_in_chunk++; \
962 break; \
963 case 1: \
964 fprintf ((FILE), "\\%03o", ch); \
965 bytes_in_chunk += 4; \
966 break; \
967 default: \
968 putc ('\\', (FILE)); \
969 putc (escape, (FILE)); \
970 bytes_in_chunk += 2; \
971 break; \
972 } \
973 } \
974 } \
975 if (bytes_in_chunk > 0) \
976 fprintf ((FILE), "\"\n"); \
977 } \
978 while (0)
979
980 /* All SVR4 targets use the ELF object file format. */
981 #define OBJECT_FORMAT_ELF