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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 do \
334 { \
335 text_section (); \
336 fprintf (FILE, \
337 "\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO); \
338 } \
339 while (0)
340
341 /* Define the actual types of some ANSI-mandated types. (These
342 definitions should work for most SVR4 systems). */
343
344 #undef SIZE_TYPE
345 #define SIZE_TYPE "unsigned int"
346
347 #undef PTRDIFF_TYPE
348 #define PTRDIFF_TYPE "int"
349
350 #undef WCHAR_TYPE
351 #define WCHAR_TYPE "long int"
352
353 #undef WCHAR_TYPE_SIZE
354 #define WCHAR_TYPE_SIZE BITS_PER_WORD
355
356 /* This causes trouble, because it requires the host machine
357 to support ANSI C. */
358 /* #define MULTIBYTE_CHARS */
359
360 #undef ASM_BYTE_OP
361 #define ASM_BYTE_OP ".byte"
362
363 #undef SET_ASM_OP
364 #define SET_ASM_OP ".set"
365
366 /* This is how to begin an assembly language file. Most svr4 assemblers want
367 at least a .file directive to come first, and some want to see a .version
368 directive come right after that. Here we just establish a default
369 which generates only the .file directive. If you need a .version
370 directive for any specific target, you should override this definition
371 in the target-specific file which includes this one. */
372
373 #undef ASM_FILE_START
374 #define ASM_FILE_START(FILE) \
375 output_file_directive ((FILE), main_input_filename)
376
377 /* This is how to allocate empty space in some section. The .zero
378 pseudo-op is used for this on most svr4 assemblers. */
379
380 #define SKIP_ASM_OP ".zero"
381
382 #undef ASM_OUTPUT_SKIP
383 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
384 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
385
386 /* The prefix to add to user-visible assembler symbols.
387
388 For System V Release 4 the convention is *not* to prepend a leading
389 underscore onto user-level symbol names. */
390
391 #undef USER_LABEL_PREFIX
392 #define USER_LABEL_PREFIX ""
393
394 /* This is how to output an internal numbered label where
395 PREFIX is the class of label and NUM is the number within the class.
396
397 For most svr4 systems, the convention is that any symbol which begins
398 with a period is not put into the linker symbol table by the assembler. */
399
400 #undef ASM_OUTPUT_INTERNAL_LABEL
401 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
402 do { \
403 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
404 } while (0)
405
406 /* This is how to store into the string LABEL
407 the symbol_ref name of an internal numbered label where
408 PREFIX is the class of label and NUM is the number within the class.
409 This is suitable for output with `assemble_name'.
410
411 For most svr4 systems, the convention is that any symbol which begins
412 with a period is not put into the linker symbol table by the assembler. */
413
414 #undef ASM_GENERATE_INTERNAL_LABEL
415 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
416 do { \
417 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
418 } while (0)
419
420 /* Output the label which precedes a jumptable. Note that for all svr4
421 systems where we actually generate jumptables (which is to say every
422 svr4 target except i386, where we use casesi instead) we put the jump-
423 tables into the .rodata section and since other stuff could have been
424 put into the .rodata section prior to any given jumptable, we have to
425 make sure that the location counter for the .rodata section gets pro-
426 perly re-aligned prior to the actual beginning of the jump table. */
427
428 #define ALIGN_ASM_OP ".align"
429
430 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
431 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
432 ASM_OUTPUT_ALIGN ((FILE), 2);
433 #endif
434
435 #undef ASM_OUTPUT_CASE_LABEL
436 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
437 do { \
438 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
439 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
440 } while (0)
441
442 /* The standard SVR4 assembler seems to require that certain builtin
443 library routines (e.g. .udiv) be explicitly declared as .globl
444 in each assembly file where they are referenced. */
445
446 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
447 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
448
449 /* This says how to output assembler code to declare an
450 uninitialized external linkage data object. Under SVR4,
451 the linker seems to want the alignment of data objects
452 to depend on their types. We do exactly that here. */
453
454 #define COMMON_ASM_OP ".comm"
455
456 #undef ASM_OUTPUT_ALIGNED_COMMON
457 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
458 do { \
459 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
460 assemble_name ((FILE), (NAME)); \
461 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
462 } while (0)
463
464 /* This says how to output assembler code to declare an
465 uninitialized internal linkage data object. Under SVR4,
466 the linker seems to want the alignment of data objects
467 to depend on their types. We do exactly that here. */
468
469 #define LOCAL_ASM_OP ".local"
470
471 #undef ASM_OUTPUT_ALIGNED_LOCAL
472 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
473 do { \
474 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
475 assemble_name ((FILE), (NAME)); \
476 fprintf ((FILE), "\n"); \
477 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
478 } while (0)
479
480 /* Biggest alignment supported by the object file format of this
481 machine. Use this macro to limit the alignment which can be
482 specified using the `__attribute__ ((aligned (N)))' construct. If
483 not defined, the default value is `BIGGEST_ALIGNMENT'. */
484
485 #define MAX_OFILE_ALIGNMENT (32768*8)
486
487 /* This is the pseudo-op used to generate a 32-bit word of data with a
488 specific value in some section. This is the same for all known svr4
489 assemblers. */
490
491 #define INT_ASM_OP ".long"
492
493 /* This is the pseudo-op used to generate a contiguous sequence of byte
494 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
495 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
496
497 #undef ASCII_DATA_ASM_OP
498 #define ASCII_DATA_ASM_OP ".ascii"
499
500 /* Support const sections and the ctors and dtors sections for g++.
501 Note that there appears to be two different ways to support const
502 sections at the moment. You can either #define the symbol
503 READONLY_DATA_SECTION (giving it some code which switches to the
504 readonly data section) or else you can #define the symbols
505 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
506 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
507
508 #define USE_CONST_SECTION 1
509
510 #define CONST_SECTION_ASM_OP ".section\t.rodata"
511
512 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
513
514 Note that we want to give these sections the SHF_WRITE attribute
515 because these sections will actually contain data (i.e. tables of
516 addresses of functions in the current root executable or shared library
517 file) and, in the case of a shared library, the relocatable addresses
518 will have to be properly resolved/relocated (and then written into) by
519 the dynamic linker when it actually attaches the given shared library
520 to the executing process. (Note that on SVR4, you may wish to use the
521 `-z text' option to the ELF linker, when building a shared library, as
522 an additional check that you are doing everything right. But if you do
523 use the `-z text' option when building a shared library, you will get
524 errors unless the .ctors and .dtors sections are marked as writable
525 via the SHF_WRITE attribute.) */
526
527 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
528 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
529
530 /* On svr4, we *do* have support for the .init and .fini sections, and we
531 can put stuff in there to be executed before and after `main'. We let
532 crtstuff.c and other files know this by defining the following symbols.
533 The definitions say how to change sections to the .init and .fini
534 sections. This is the same for all known svr4 assemblers. */
535
536 #define INIT_SECTION_ASM_OP ".section\t.init"
537 #define FINI_SECTION_ASM_OP ".section\t.fini"
538
539 /* A default list of other sections which we might be "in" at any given
540 time. For targets that use additional sections (e.g. .tdesc) you
541 should override this definition in the target-specific file which
542 includes this file. */
543
544 #undef EXTRA_SECTIONS
545 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
546
547 /* A default list of extra section function definitions. For targets
548 that use additional sections (e.g. .tdesc) you should override this
549 definition in the target-specific file which includes this file. */
550
551 #undef EXTRA_SECTION_FUNCTIONS
552 #define EXTRA_SECTION_FUNCTIONS \
553 CONST_SECTION_FUNCTION \
554 CTORS_SECTION_FUNCTION \
555 DTORS_SECTION_FUNCTION
556
557 #define READONLY_DATA_SECTION() const_section ()
558
559 extern void text_section ();
560
561 #define CONST_SECTION_FUNCTION \
562 void \
563 const_section () \
564 { \
565 if (!USE_CONST_SECTION) \
566 text_section(); \
567 else if (in_section != in_const) \
568 { \
569 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
570 in_section = in_const; \
571 } \
572 }
573
574 #define CTORS_SECTION_FUNCTION \
575 void \
576 ctors_section () \
577 { \
578 if (in_section != in_ctors) \
579 { \
580 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
581 in_section = in_ctors; \
582 } \
583 }
584
585 #define DTORS_SECTION_FUNCTION \
586 void \
587 dtors_section () \
588 { \
589 if (in_section != in_dtors) \
590 { \
591 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
592 in_section = in_dtors; \
593 } \
594 }
595
596
597 /*
598 * Switch into a generic section.
599 *
600 * We make the section read-only and executable for a function decl,
601 * read-only for a const data decl, and writable for a non-const data decl.
602 *
603 * If the section has already been defined, we must not
604 * emit the attributes here. The SVR4 assembler does not
605 * recognize section redefinitions.
606 * If DECL is NULL, no attributes are emitted.
607 */
608 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
609 do { \
610 static struct section_info \
611 { \
612 struct section_info *next; \
613 char *name; \
614 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
615 } *sections; \
616 struct section_info *s; \
617 char *mode; \
618 enum sect_enum type; \
619 \
620 for (s = sections; s; s = s->next) \
621 if (!strcmp (NAME, s->name)) \
622 break; \
623 \
624 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
625 type = SECT_EXEC, mode = "ax"; \
626 else if (DECL && TREE_READONLY (DECL)) \
627 type = SECT_RO, mode = "a"; \
628 else \
629 type = SECT_RW, mode = "aw"; \
630 \
631 if (s == 0) \
632 { \
633 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
634 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
635 strcpy (s->name, NAME); \
636 s->type = type; \
637 s->next = sections; \
638 sections = s; \
639 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \
640 } \
641 else \
642 { \
643 if (DECL && s->type != type) \
644 error_with_decl (DECL, "%s causes a section type conflict"); \
645 \
646 fprintf (FILE, ".section\t%s\n", NAME); \
647 } \
648 } while (0)
649
650 /* A C statement (sans semicolon) to mark DECL to be emitted as a
651 public symbol such that extra copies in multiple translation units will
652 be discarded by the linker. */
653 #define MAKE_DECL_ONE_ONLY(DECL) \
654 do { \
655 int len; \
656 char *name, *string, *prefix; \
657 \
658 DECL_WEAK (DECL) = 1; \
659 \
660 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
661 \
662 if (TREE_CODE (DECL) == FUNCTION_DECL) \
663 prefix = ".gnu.linkonce.t."; \
664 else if (TREE_READONLY (DECL)) \
665 prefix = ".gnu.linkonce.r."; \
666 else \
667 prefix = ".gnu.linkonce.d."; \
668 \
669 len = strlen (name) + strlen (prefix); \
670 string = alloca (len + 1); \
671 sprintf (string, "%s%s", prefix, name); \
672 \
673 DECL_SECTION_NAME (DECL) = build_string (len, string); \
674 } while (0)
675
676 /* A C statement (sans semicolon) to output an element in the table of
677 global constructors. */
678 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
679 do { \
680 ctors_section (); \
681 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
682 assemble_name (FILE, NAME); \
683 fprintf (FILE, "\n"); \
684 } while (0)
685
686 /* A C statement (sans semicolon) to output an element in the table of
687 global destructors. */
688 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
689 do { \
690 dtors_section (); \
691 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
692 assemble_name (FILE, NAME); \
693 fprintf (FILE, "\n"); \
694 } while (0)
695
696 /* A C statement or statements to switch to the appropriate
697 section for output of DECL. DECL is either a `VAR_DECL' node
698 or a constant of some sort. RELOC indicates whether forming
699 the initial value of DECL requires link-time relocations. */
700
701 #define SELECT_SECTION(DECL,RELOC) \
702 { \
703 if (flag_pic && RELOC) \
704 data_section (); \
705 else if (TREE_CODE (DECL) == STRING_CST) \
706 { \
707 if (! flag_writable_strings) \
708 const_section (); \
709 else \
710 data_section (); \
711 } \
712 else if (TREE_CODE (DECL) == VAR_DECL) \
713 { \
714 if (!TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
715 || !DECL_INITIAL (DECL) \
716 || (DECL_INITIAL (DECL) != error_mark_node \
717 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
718 data_section (); \
719 else \
720 const_section (); \
721 } \
722 else \
723 const_section (); \
724 }
725
726 /* A C statement or statements to switch to the appropriate
727 section for output of RTX in mode MODE. RTX is some kind
728 of constant in RTL. The argument MODE is redundant except
729 in the case of a `const_int' rtx. Currently, these always
730 go into the const section. */
731
732 #undef SELECT_RTX_SECTION
733 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
734
735 /* Define the strings used for the special svr4 .type and .size directives.
736 These strings generally do not vary from one system running svr4 to
737 another, but if a given system (e.g. m88k running svr) needs to use
738 different pseudo-op names for these, they may be overridden in the
739 file which includes this one. */
740
741 #define TYPE_ASM_OP ".type"
742 #define SIZE_ASM_OP ".size"
743
744 /* This is how we tell the assembler that a symbol is weak. */
745
746 #define ASM_WEAKEN_LABEL(FILE,NAME) \
747 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
748 fputc ('\n', FILE); } while (0)
749
750 /* The following macro defines the format used to output the second
751 operand of the .type assembler directive. Different svr4 assemblers
752 expect various different forms for this operand. The one given here
753 is just a default. You may need to override it in your machine-
754 specific tm.h file (depending upon the particulars of your assembler). */
755
756 #define TYPE_OPERAND_FMT "@%s"
757
758 /* Write the extra assembler code needed to declare a function's result.
759 Most svr4 assemblers don't require any special declaration of the
760 result value, but there are exceptions. */
761
762 #ifndef ASM_DECLARE_RESULT
763 #define ASM_DECLARE_RESULT(FILE, RESULT)
764 #endif
765
766 /* These macros generate the special .type and .size directives which
767 are used to set the corresponding fields of the linker symbol table
768 entries in an ELF object file under SVR4. These macros also output
769 the starting labels for the relevant functions/objects. */
770
771 /* Write the extra assembler code needed to declare a function properly.
772 Some svr4 assemblers need to also have something extra said about the
773 function's return value. We allow for that here. */
774
775 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
776 do { \
777 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
778 assemble_name (FILE, NAME); \
779 putc (',', FILE); \
780 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
781 putc ('\n', FILE); \
782 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
783 ASM_OUTPUT_LABEL(FILE, NAME); \
784 } while (0)
785
786 /* Write the extra assembler code needed to declare an object properly. */
787
788 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
789 do { \
790 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
791 assemble_name (FILE, NAME); \
792 putc (',', FILE); \
793 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
794 putc ('\n', FILE); \
795 size_directive_output = 0; \
796 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
797 { \
798 size_directive_output = 1; \
799 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
800 assemble_name (FILE, NAME); \
801 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
802 } \
803 ASM_OUTPUT_LABEL(FILE, NAME); \
804 } while (0)
805
806 /* Output the size directive for a decl in rest_of_decl_compilation
807 in the case where we did not do so before the initializer.
808 Once we find the error_mark_node, we know that the value of
809 size_directive_output was set
810 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
811
812 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
813 do { \
814 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
815 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
816 && ! AT_END && TOP_LEVEL \
817 && DECL_INITIAL (DECL) == error_mark_node \
818 && !size_directive_output) \
819 { \
820 size_directive_output = 1; \
821 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
822 assemble_name (FILE, name); \
823 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
824 } \
825 } while (0)
826
827 /* This is how to declare the size of a function. */
828
829 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
830 do { \
831 if (!flag_inhibit_size_directive) \
832 { \
833 char label[256]; \
834 static int labelno; \
835 labelno++; \
836 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
837 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
838 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
839 assemble_name (FILE, (FNAME)); \
840 fprintf (FILE, ","); \
841 assemble_name (FILE, label); \
842 fprintf (FILE, "-"); \
843 assemble_name (FILE, (FNAME)); \
844 putc ('\n', FILE); \
845 } \
846 } while (0)
847
848 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
849 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
850 corresponds to a particular byte value [0..255]. For any
851 given byte value, if the value in the corresponding table
852 position is zero, the given character can be output directly.
853 If the table value is 1, the byte must be output as a \ooo
854 octal escape. If the tables value is anything else, then the
855 byte value should be output as a \ followed by the value
856 in the table. Note that we can use standard UN*X escape
857 sequences for many control characters, but we don't use
858 \a to represent BEL because some svr4 assemblers (e.g. on
859 the i386) don't know about that. Also, we don't use \v
860 since some versions of gas, such as 2.2 did not accept it. */
861
862 #define ESCAPES \
863 "\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\
864 \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\
865 \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\
866 \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\
867 \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\
868 \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\
869 \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\
870 \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"
871
872 /* Some svr4 assemblers have a limit on the number of characters which
873 can appear in the operand of a .string directive. If your assembler
874 has such a limitation, you should define STRING_LIMIT to reflect that
875 limit. Note that at least some svr4 assemblers have a limit on the
876 actual number of bytes in the double-quoted string, and that they
877 count each character in an escape sequence as one byte. Thus, an
878 escape sequence like \377 would count as four bytes.
879
880 If your target assembler doesn't support the .string directive, you
881 should define this to zero.
882 */
883
884 #define STRING_LIMIT ((unsigned) 256)
885
886 #define STRING_ASM_OP ".string"
887
888 /* The routine used to output NUL terminated strings. We use a special
889 version of this for most svr4 targets because doing so makes the
890 generated assembly code more compact (and thus faster to assemble)
891 as well as more readable, especially for targets like the i386
892 (where the only alternative is to output character sequences as
893 comma separated lists of numbers). */
894
895 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
896 do \
897 { \
898 register unsigned char *_limited_str = (unsigned char *) (STR); \
899 register unsigned ch; \
900 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
901 for (; ch = *_limited_str; _limited_str++) \
902 { \
903 register int escape; \
904 switch (escape = ESCAPES[ch]) \
905 { \
906 case 0: \
907 putc (ch, (FILE)); \
908 break; \
909 case 1: \
910 fprintf ((FILE), "\\%03o", ch); \
911 break; \
912 default: \
913 putc ('\\', (FILE)); \
914 putc (escape, (FILE)); \
915 break; \
916 } \
917 } \
918 fprintf ((FILE), "\"\n"); \
919 } \
920 while (0)
921
922 /* The routine used to output sequences of byte values. We use a special
923 version of this for most svr4 targets because doing so makes the
924 generated assembly code more compact (and thus faster to assemble)
925 as well as more readable. Note that if we find subparts of the
926 character sequence which end with NUL (and which are shorter than
927 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
928
929 #undef ASM_OUTPUT_ASCII
930 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
931 do \
932 { \
933 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
934 register unsigned char *limit = _ascii_bytes + (LENGTH); \
935 register unsigned bytes_in_chunk = 0; \
936 for (; _ascii_bytes < limit; _ascii_bytes++) \
937 { \
938 register unsigned char *p; \
939 if (bytes_in_chunk >= 60) \
940 { \
941 fprintf ((FILE), "\"\n"); \
942 bytes_in_chunk = 0; \
943 } \
944 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
945 continue; \
946 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
947 { \
948 if (bytes_in_chunk > 0) \
949 { \
950 fprintf ((FILE), "\"\n"); \
951 bytes_in_chunk = 0; \
952 } \
953 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
954 _ascii_bytes = p; \
955 } \
956 else \
957 { \
958 register int escape; \
959 register unsigned ch; \
960 if (bytes_in_chunk == 0) \
961 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
962 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
963 { \
964 case 0: \
965 putc (ch, (FILE)); \
966 bytes_in_chunk++; \
967 break; \
968 case 1: \
969 fprintf ((FILE), "\\%03o", ch); \
970 bytes_in_chunk += 4; \
971 break; \
972 default: \
973 putc ('\\', (FILE)); \
974 putc (escape, (FILE)); \
975 bytes_in_chunk += 2; \
976 break; \
977 } \
978 } \
979 } \
980 if (bytes_in_chunk > 0) \
981 fprintf ((FILE), "\"\n"); \
982 } \
983 while (0)
984
985 /* All SVR4 targets use the ELF object file format. */
986 #define OBJECT_FORMAT_ELF