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({ASM,LINK}_:SPEC): %{V} %{v:%{!V:-V}} -> %{v:-V}.
[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@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 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
57 || (CHAR) == 'h' \
58 || (CHAR) == 'x' \
59 || (CHAR) == 'z')
60
61 /* This defines which multi-letter switches take arguments. On svr4,
62 there are no such switches except those implemented by GCC itself. */
63
64 #define WORD_SWITCH_TAKES_ARG(STR) \
65 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
66 && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \
67 && strcmp (STR, "Tbss"))
68
69 /* You should redefine CPP_PREDEFINES in any file which includes this one.
70 The definition should be appropriate for the type of target system
71 involved, and it should include any -A (assertion) options which are
72 appropriate for the given target system. */
73 #undef CPP_PREDEFINES
74
75 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
76 many of the specialized svr4 assembler options as seems reasonable,
77 given that there are certain options which we can't (or shouldn't)
78 support directly due to the fact that they conflict with other options
79 for other svr4 tools (e.g. ld) or with other options for GCC itself.
80 For example, we don't support the -o (output file) or -R (remove
81 input file) options because GCC already handles these things. We
82 also don't support the -m (run m4) option for the assembler because
83 that conflicts with the -m (produce load map) option of the svr4
84 linker. We do however allow passing arbitrary options to the svr4
85 assembler via the -Wa, option.
86
87 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
88 option.
89 */
90
91 #undef ASM_SPEC
92 #define ASM_SPEC \
93 "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
94
95 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
96 the -o option (and its argument) for some reason. If we try to put it
97 before the -o option, the assembler will try to read the file named as
98 the output file in the -o option as an input file (after it has already
99 written some stuff to it) and the binary stuff contained therein will
100 cause totally confuse the assembler, resulting in many spurious error
101 messages. */
102
103 #undef ASM_FINAL_SPEC
104 #define ASM_FINAL_SPEC "%|"
105
106 /* Under svr4, the normal location of the `ld' and `as' programs is the
107 /usr/ccs/bin directory. */
108
109 #ifndef CROSS_COMPILE
110 #undef MD_EXEC_PREFIX
111 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
112 #endif
113
114 /* Under svr4, the normal location of the various *crt*.o files is the
115 /usr/ccs/lib directory. */
116
117 #ifndef CROSS_COMPILE
118 #undef MD_STARTFILE_PREFIX
119 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
120 #endif
121
122 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
123 standard C library (unless we are building a shared library). */
124
125 #undef LIB_SPEC
126 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
127
128 /* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own
129 magical crtend.o file (see crtstuff.c) which provides part of the
130 support for getting C++ file-scope static object constructed before
131 entering `main', followed by the normal svr3/svr4 "finalizer" file,
132 which is either `gcrtn.o' or `crtn.o'. */
133
134 #undef ENDFILE_SPEC
135 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
136
137 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
138 for the special GCC options -static, -shared, and -symbolic which
139 allow us to link things in one of these three modes by applying the
140 appropriate combinations of options at link-time. We also provide
141 support here for as many of the other svr4 linker options as seems
142 reasonable, given that some of them conflict with options for other
143 svr4 tools (e.g. the assembler). In particular, we do support the
144 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
145 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
146 by gcc.c itself. We don't directly support the -m (generate load
147 map) option because that conflicts with the -m (run m4) option of
148 the svr4 assembler. We also don't directly support the svr4 linker's
149 -I* or -M* options because these conflict with existing GCC options.
150 We do however allow passing arbitrary options to the svr4 linker
151 via the -Wl, option. We don't support the svr4 linker's -a option
152 at all because it is totally useless and because it conflicts with
153 GCC's own -a option.
154
155 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
156
157 When the -G link option is used (-shared and -symbolic) a final link is
158 not being done. */
159
160 #undef LINK_SPEC
161 #ifdef CROSS_COMPILE
162 #define LINK_SPEC "%{h*} %{v:-V} \
163 %{b} %{Wl,*:%*} \
164 %{static:-dn -Bstatic} \
165 %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \
166 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
167 %{G:-G} \
168 %{YP,*} \
169 %{Qy:} %{!Qn:-Qy}"
170 #else
171 #define LINK_SPEC "%{h*} %{v:-V} \
172 %{b} %{Wl,*:%*} \
173 %{static:-dn -Bstatic} \
174 %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \
175 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
176 %{G:-G} \
177 %{YP,*} \
178 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
179 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
180 %{Qy:} %{!Qn:-Qy}"
181 #endif
182
183 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
184 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
185 link step (depending upon the other gcc options selected, such as
186 -traditional and -ansi). These files each contain one (initialized)
187 copy of a special variable called `_lib_version'. Each one of these
188 files has `_lib_version' initialized to a different (enum) value.
189 The SVR4 library routines query the value of `_lib_version' at run
190 to decide how they should behave. Specifically, they decide (based
191 upon the value of `_lib_version') if they will act in a strictly ANSI
192 conforming manner or not.
193 */
194
195 #undef STARTFILE_SPEC
196 #define STARTFILE_SPEC "%{!shared: \
197 %{!symbolic: \
198 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
199 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
200 %{ansi:values-Xc.o%s} \
201 %{!ansi: \
202 %{traditional:values-Xt.o%s} \
203 %{!traditional:values-Xa.o%s}} \
204 crtbegin.o%s"
205
206 /* Attach a special .ident directive to the end of the file to identify
207 the version of GCC which compiled this code. The format of the
208 .ident string is patterned after the ones produced by native svr4
209 C compilers. */
210
211 #define IDENT_ASM_OP ".ident"
212
213 #define ASM_FILE_END(FILE) \
214 do { \
215 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
216 IDENT_ASM_OP, version_string); \
217 } while (0)
218
219 /* Allow #sccs in preprocessor. */
220
221 #define SCCS_DIRECTIVE
222
223 /* Output #ident as a .ident. */
224
225 #define ASM_OUTPUT_IDENT(FILE, NAME) \
226 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
227
228 /* Use periods rather than dollar signs in special g++ assembler names. */
229
230 #define NO_DOLLAR_IN_LABEL
231
232 /* Writing `int' for a bitfield forces int alignment for the structure. */
233
234 #define PCC_BITFIELD_TYPE_MATTERS 1
235
236 /* Implicit library calls should use memcpy, not bcopy, etc. */
237
238 #define TARGET_MEM_FUNCTIONS
239
240 /* Handle #pragma weak and #pragma pack. */
241
242 #define HANDLE_SYSV_PRAGMA
243
244 /* System V Release 4 uses DWARF debugging info. */
245
246 #define DWARF_DEBUGGING_INFO
247
248 /* The numbers used to denote specific machine registers in the System V
249 Release 4 DWARF debugging information are quite likely to be totally
250 different from the numbers used in BSD stabs debugging information
251 for the same kind of target machine. Thus, we undefine the macro
252 DBX_REGISTER_NUMBER here as an extra inducement to get people to
253 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
254 (which is also used to provide DWARF registers numbers in dwarfout.c)
255 in their tm.h files which include this file. */
256
257 #undef DBX_REGISTER_NUMBER
258
259 /* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
260 in general, although it will only work when using gas. */
261
262 #define DBX_DEBUGGING_INFO
263
264 /* When generating stabs debugging, use N_BINCL entries. */
265
266 #define DBX_USE_BINCL
267
268 /* Use DWARF debugging info by default. */
269
270 #ifndef PREFERRED_DEBUGGING_TYPE
271 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
272 #endif
273
274 /* Make LBRAC and RBRAC addresses relative to the start of the
275 function. The native Solaris stabs debugging format works this
276 way, gdb expects it, and it reduces the number of relocation
277 entries. */
278
279 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
280
281 /* When using stabs, gcc2_compiled must be a stabs entry, not an
282 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
283 the input piecemeal, starting with each N_SO, it's a lot easier if
284 the gcc2 flag symbol is *after* the N_SO rather than before it. So
285 we emit an N_OPT stab there. */
286
287 #define ASM_IDENTIFY_GCC(FILE) \
288 do \
289 { \
290 if (write_symbols != DBX_DEBUG) \
291 fputs ("gcc2_compiled.:\n", FILE); \
292 } \
293 while (0)
294
295 #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
296 do \
297 { \
298 if (write_symbols == DBX_DEBUG) \
299 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
300 } \
301 while (0)
302
303 /* Like block addresses, stabs line numbers are relative to the
304 current function. */
305
306 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
307 do \
308 { \
309 static int sym_lineno = 1; \
310 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
311 line, sym_lineno); \
312 assemble_name (file, \
313 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
314 fprintf (file, "\n.LM%d:\n", sym_lineno); \
315 sym_lineno += 1; \
316 } \
317 while (0)
318
319 /* In order for relative line numbers to work, we must output the
320 stabs entry for the function name first. */
321
322 #define DBX_FUNCTION_FIRST
323
324 /* Generate a blank trailing N_SO to mark the end of the .o file, since
325 we can't depend upon the linker to mark .o file boundaries with
326 embedded stabs. */
327
328 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
329 fprintf (FILE, \
330 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
331
332 /* Define the actual types of some ANSI-mandated types. (These
333 definitions should work for most SVR4 systems). */
334
335 #undef SIZE_TYPE
336 #define SIZE_TYPE "unsigned int"
337
338 #undef PTRDIFF_TYPE
339 #define PTRDIFF_TYPE "int"
340
341 #undef WCHAR_TYPE
342 #define WCHAR_TYPE "long int"
343
344 #undef WCHAR_TYPE_SIZE
345 #define WCHAR_TYPE_SIZE BITS_PER_WORD
346
347 /* This causes trouble, because it requires the host machine
348 to support ANSI C. */
349 /* #define MULTIBYTE_CHARS */
350
351 #undef ASM_BYTE_OP
352 #define ASM_BYTE_OP ".byte"
353
354 #undef SET_ASM_OP
355 #define SET_ASM_OP ".set"
356
357 /* This is how to begin an assembly language file. Most svr4 assemblers want
358 at least a .file directive to come first, and some want to see a .version
359 directive come right after that. Here we just establish a default
360 which generates only the .file directive. If you need a .version
361 directive for any specific target, you should override this definition
362 in the target-specific file which includes this one. */
363
364 #undef ASM_FILE_START
365 #define ASM_FILE_START(FILE) \
366 output_file_directive ((FILE), main_input_filename)
367
368 /* This is how to allocate empty space in some section. The .zero
369 pseudo-op is used for this on most svr4 assemblers. */
370
371 #define SKIP_ASM_OP ".zero"
372
373 #undef ASM_OUTPUT_SKIP
374 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
375 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
376
377 /* This is how to output a reference to a user-level label named NAME.
378 `assemble_name' uses this.
379
380 For System V Release 4 the convention is *not* to prepend a leading
381 underscore onto user-level symbol names. */
382
383 #undef ASM_OUTPUT_LABELREF
384 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
385
386 /* This is how to output an internal numbered label where
387 PREFIX is the class of label and NUM is the number within the class.
388
389 For most svr4 systems, the convention is that any symbol which begins
390 with a period is not put into the linker symbol table by the assembler. */
391
392 #undef ASM_OUTPUT_INTERNAL_LABEL
393 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
394 do { \
395 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
396 } while (0)
397
398 /* This is how to store into the string LABEL
399 the symbol_ref name of an internal numbered label where
400 PREFIX is the class of label and NUM is the number within the class.
401 This is suitable for output with `assemble_name'.
402
403 For most svr4 systems, the convention is that any symbol which begins
404 with a period is not put into the linker symbol table by the assembler. */
405
406 #undef ASM_GENERATE_INTERNAL_LABEL
407 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
408 do { \
409 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
410 } while (0)
411
412 /* Output the label which precedes a jumptable. Note that for all svr4
413 systems where we actually generate jumptables (which is to say every
414 svr4 target except i386, where we use casesi instead) we put the jump-
415 tables into the .rodata section and since other stuff could have been
416 put into the .rodata section prior to any given jumptable, we have to
417 make sure that the location counter for the .rodata section gets pro-
418 perly re-aligned prior to the actual beginning of the jump table. */
419
420 #define ALIGN_ASM_OP ".align"
421
422 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
423 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
424 ASM_OUTPUT_ALIGN ((FILE), 2);
425 #endif
426
427 #undef ASM_OUTPUT_CASE_LABEL
428 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
429 do { \
430 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
431 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
432 } while (0)
433
434 /* The standard SVR4 assembler seems to require that certain builtin
435 library routines (e.g. .udiv) be explicitly declared as .globl
436 in each assembly file where they are referenced. */
437
438 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
439 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
440
441 /* This says how to output assembler code to declare an
442 uninitialized external linkage data object. Under SVR4,
443 the linker seems to want the alignment of data objects
444 to depend on their types. We do exactly that here. */
445
446 #define COMMON_ASM_OP ".comm"
447
448 #undef ASM_OUTPUT_ALIGNED_COMMON
449 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
450 do { \
451 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
452 assemble_name ((FILE), (NAME)); \
453 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
454 } while (0)
455
456 /* This says how to output assembler code to declare an
457 uninitialized internal linkage data object. Under SVR4,
458 the linker seems to want the alignment of data objects
459 to depend on their types. We do exactly that here. */
460
461 #define LOCAL_ASM_OP ".local"
462
463 #undef ASM_OUTPUT_ALIGNED_LOCAL
464 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
465 do { \
466 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
467 assemble_name ((FILE), (NAME)); \
468 fprintf ((FILE), "\n"); \
469 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
470 } while (0)
471
472 /* Biggest alignment supported by the object file format of this
473 machine. Use this macro to limit the alignment which can be
474 specified using the `__attribute__ ((aligned (N)))' construct. If
475 not defined, the default value is `BIGGEST_ALIGNMENT'. */
476
477 #define MAX_OFILE_ALIGNMENT (32768*8)
478
479 /* This is the pseudo-op used to generate a 32-bit word of data with a
480 specific value in some section. This is the same for all known svr4
481 assemblers. */
482
483 #define INT_ASM_OP ".long"
484
485 /* This is the pseudo-op used to generate a contiguous sequence of byte
486 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
487 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
488
489 #undef ASCII_DATA_ASM_OP
490 #define ASCII_DATA_ASM_OP ".ascii"
491
492 /* Support const sections and the ctors and dtors sections for g++.
493 Note that there appears to be two different ways to support const
494 sections at the moment. You can either #define the symbol
495 READONLY_DATA_SECTION (giving it some code which switches to the
496 readonly data section) or else you can #define the symbols
497 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
498 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
499
500 #define USE_CONST_SECTION 1
501
502 #define CONST_SECTION_ASM_OP ".section\t.rodata"
503
504 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
505
506 Note that we want to give these sections the SHF_WRITE attribute
507 because these sections will actually contain data (i.e. tables of
508 addresses of functions in the current root executable or shared library
509 file) and, in the case of a shared library, the relocatable addresses
510 will have to be properly resolved/relocated (and then written into) by
511 the dynamic linker when it actually attaches the given shared library
512 to the executing process. (Note that on SVR4, you may wish to use the
513 `-z text' option to the ELF linker, when building a shared library, as
514 an additional check that you are doing everything right. But if you do
515 use the `-z text' option when building a shared library, you will get
516 errors unless the .ctors and .dtors sections are marked as writable
517 via the SHF_WRITE attribute.) */
518
519 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
520 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
521
522 /* On svr4, we *do* have support for the .init and .fini sections, and we
523 can put stuff in there to be executed before and after `main'. We let
524 crtstuff.c and other files know this by defining the following symbols.
525 The definitions say how to change sections to the .init and .fini
526 sections. This is the same for all known svr4 assemblers. */
527
528 #define INIT_SECTION_ASM_OP ".section\t.init"
529 #define FINI_SECTION_ASM_OP ".section\t.fini"
530
531 /* A default list of other sections which we might be "in" at any given
532 time. For targets that use additional sections (e.g. .tdesc) you
533 should override this definition in the target-specific file which
534 includes this file. */
535
536 #undef EXTRA_SECTIONS
537 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
538
539 /* A default list of extra section function definitions. For targets
540 that use additional sections (e.g. .tdesc) you should override this
541 definition in the target-specific file which includes this file. */
542
543 #undef EXTRA_SECTION_FUNCTIONS
544 #define EXTRA_SECTION_FUNCTIONS \
545 CONST_SECTION_FUNCTION \
546 CTORS_SECTION_FUNCTION \
547 DTORS_SECTION_FUNCTION
548
549 #define READONLY_DATA_SECTION() const_section ()
550
551 extern void text_section ();
552
553 #define CONST_SECTION_FUNCTION \
554 void \
555 const_section () \
556 { \
557 if (!USE_CONST_SECTION) \
558 text_section(); \
559 else if (in_section != in_const) \
560 { \
561 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
562 in_section = in_const; \
563 } \
564 }
565
566 #define CTORS_SECTION_FUNCTION \
567 void \
568 ctors_section () \
569 { \
570 if (in_section != in_ctors) \
571 { \
572 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
573 in_section = in_ctors; \
574 } \
575 }
576
577 #define DTORS_SECTION_FUNCTION \
578 void \
579 dtors_section () \
580 { \
581 if (in_section != in_dtors) \
582 { \
583 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
584 in_section = in_dtors; \
585 } \
586 }
587
588
589 /*
590 * Switch into a generic section.
591 *
592 * We make the section read-only and executable for a function decl,
593 * read-only for a const data decl, and writable for a non-const data decl.
594 *
595 * If the section has already been defined, we must not
596 * emit the attributes here. The SVR4 assembler does not
597 * recognize section redefinitions.
598 * If DECL is NULL, no attributes are emitted.
599 */
600 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
601 do { \
602 static struct section_info \
603 { \
604 struct section_info *next; \
605 char *name; \
606 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
607 } *sections; \
608 struct section_info *s; \
609 char *mode; \
610 enum sect_enum type; \
611 \
612 for (s = sections; s; s = s->next) \
613 if (!strcmp (NAME, s->name)) \
614 break; \
615 \
616 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
617 type = SECT_EXEC, mode = "ax"; \
618 else if (DECL && TREE_READONLY (DECL)) \
619 type = SECT_RO, mode = "a"; \
620 else \
621 type = SECT_RW, mode = "aw"; \
622 \
623 if (s == 0) \
624 { \
625 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
626 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
627 strcpy (s->name, NAME); \
628 s->type = type; \
629 s->next = sections; \
630 sections = s; \
631 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \
632 } \
633 else \
634 { \
635 if (DECL && s->type != type) \
636 error_with_decl (DECL, "%s causes a section type conflict"); \
637 \
638 fprintf (FILE, ".section\t%s\n", NAME); \
639 } \
640 } while (0)
641
642 /* A C statement (sans semicolon) to output an element in the table of
643 global constructors. */
644 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
645 do { \
646 ctors_section (); \
647 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
648 assemble_name (FILE, NAME); \
649 fprintf (FILE, "\n"); \
650 } while (0)
651
652 /* A C statement (sans semicolon) to output an element in the table of
653 global destructors. */
654 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
655 do { \
656 dtors_section (); \
657 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
658 assemble_name (FILE, NAME); \
659 fprintf (FILE, "\n"); \
660 } while (0)
661
662 /* A C statement or statements to switch to the appropriate
663 section for output of DECL. DECL is either a `VAR_DECL' node
664 or a constant of some sort. RELOC indicates whether forming
665 the initial value of DECL requires link-time relocations. */
666
667 #define SELECT_SECTION(DECL,RELOC) \
668 { \
669 if (flag_pic && RELOC) \
670 data_section (); \
671 else if (TREE_CODE (DECL) == STRING_CST) \
672 { \
673 if (! flag_writable_strings) \
674 const_section (); \
675 else \
676 data_section (); \
677 } \
678 else if (TREE_CODE (DECL) == VAR_DECL) \
679 { \
680 if (!TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
681 || !DECL_INITIAL (DECL) \
682 || (DECL_INITIAL (DECL) != error_mark_node \
683 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
684 data_section (); \
685 else \
686 const_section (); \
687 } \
688 else \
689 const_section (); \
690 }
691
692 /* A C statement or statements to switch to the appropriate
693 section for output of RTX in mode MODE. RTX is some kind
694 of constant in RTL. The argument MODE is redundant except
695 in the case of a `const_int' rtx. Currently, these always
696 go into the const section. */
697
698 #undef SELECT_RTX_SECTION
699 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
700
701 /* Define the strings used for the special svr4 .type and .size directives.
702 These strings generally do not vary from one system running svr4 to
703 another, but if a given system (e.g. m88k running svr) needs to use
704 different pseudo-op names for these, they may be overridden in the
705 file which includes this one. */
706
707 #define TYPE_ASM_OP ".type"
708 #define SIZE_ASM_OP ".size"
709
710 /* This is how we tell the assembler that a symbol is weak. */
711
712 #define ASM_WEAKEN_LABEL(FILE,NAME) \
713 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
714 fputc ('\n', FILE); } while (0)
715
716 /* The following macro defines the format used to output the second
717 operand of the .type assembler directive. Different svr4 assemblers
718 expect various different forms for this operand. The one given here
719 is just a default. You may need to override it in your machine-
720 specific tm.h file (depending upon the particulars of your assembler). */
721
722 #define TYPE_OPERAND_FMT "@%s"
723
724 /* Write the extra assembler code needed to declare a function's result.
725 Most svr4 assemblers don't require any special declaration of the
726 result value, but there are exceptions. */
727
728 #ifndef ASM_DECLARE_RESULT
729 #define ASM_DECLARE_RESULT(FILE, RESULT)
730 #endif
731
732 /* These macros generate the special .type and .size directives which
733 are used to set the corresponding fields of the linker symbol table
734 entries in an ELF object file under SVR4. These macros also output
735 the starting labels for the relevant functions/objects. */
736
737 /* Write the extra assembler code needed to declare a function properly.
738 Some svr4 assemblers need to also have something extra said about the
739 function's return value. We allow for that here. */
740
741 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
742 do { \
743 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
744 assemble_name (FILE, NAME); \
745 putc (',', FILE); \
746 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
747 putc ('\n', FILE); \
748 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
749 ASM_OUTPUT_LABEL(FILE, NAME); \
750 } while (0)
751
752 /* Write the extra assembler code needed to declare an object properly. */
753
754 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
755 do { \
756 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
757 assemble_name (FILE, NAME); \
758 putc (',', FILE); \
759 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
760 putc ('\n', FILE); \
761 size_directive_output = 0; \
762 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
763 { \
764 size_directive_output = 1; \
765 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
766 assemble_name (FILE, NAME); \
767 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
768 } \
769 ASM_OUTPUT_LABEL(FILE, NAME); \
770 } while (0)
771
772 /* Output the size directive for a decl in rest_of_decl_compilation
773 in the case where we did not do so before the initializer.
774 Once we find the error_mark_node, we know that the value of
775 size_directive_output was set
776 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
777
778 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
779 do { \
780 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
781 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
782 && ! AT_END && TOP_LEVEL \
783 && DECL_INITIAL (DECL) == error_mark_node \
784 && !size_directive_output) \
785 { \
786 size_directive_output = 1; \
787 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
788 assemble_name (FILE, name); \
789 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
790 } \
791 } while (0)
792
793 /* This is how to declare the size of a function. */
794
795 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
796 do { \
797 if (!flag_inhibit_size_directive) \
798 { \
799 char label[256]; \
800 static int labelno; \
801 labelno++; \
802 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
803 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
804 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
805 assemble_name (FILE, (FNAME)); \
806 fprintf (FILE, ","); \
807 assemble_name (FILE, label); \
808 fprintf (FILE, "-"); \
809 assemble_name (FILE, (FNAME)); \
810 putc ('\n', FILE); \
811 } \
812 } while (0)
813
814 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
815 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
816 corresponds to a particular byte value [0..255]. For any
817 given byte value, if the value in the corresponding table
818 position is zero, the given character can be output directly.
819 If the table value is 1, the byte must be output as a \ooo
820 octal escape. If the tables value is anything else, then the
821 byte value should be output as a \ followed by the value
822 in the table. Note that we can use standard UN*X escape
823 sequences for many control characters, but we don't use
824 \a to represent BEL because some svr4 assemblers (e.g. on
825 the i386) don't know about that. Also, we don't use \v
826 since some versions of gas, such as 2.2 did not accept it. */
827
828 #define ESCAPES \
829 "\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\
830 \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\
831 \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\
832 \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\
833 \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\
834 \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\
835 \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\
836 \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"
837
838 /* Some svr4 assemblers have a limit on the number of characters which
839 can appear in the operand of a .string directive. If your assembler
840 has such a limitation, you should define STRING_LIMIT to reflect that
841 limit. Note that at least some svr4 assemblers have a limit on the
842 actual number of bytes in the double-quoted string, and that they
843 count each character in an escape sequence as one byte. Thus, an
844 escape sequence like \377 would count as four bytes.
845
846 If your target assembler doesn't support the .string directive, you
847 should define this to zero.
848 */
849
850 #define STRING_LIMIT ((unsigned) 256)
851
852 #define STRING_ASM_OP ".string"
853
854 /* The routine used to output NUL terminated strings. We use a special
855 version of this for most svr4 targets because doing so makes the
856 generated assembly code more compact (and thus faster to assemble)
857 as well as more readable, especially for targets like the i386
858 (where the only alternative is to output character sequences as
859 comma separated lists of numbers). */
860
861 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
862 do \
863 { \
864 register unsigned char *_limited_str = (unsigned char *) (STR); \
865 register unsigned ch; \
866 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
867 for (; ch = *_limited_str; _limited_str++) \
868 { \
869 register int escape; \
870 switch (escape = ESCAPES[ch]) \
871 { \
872 case 0: \
873 putc (ch, (FILE)); \
874 break; \
875 case 1: \
876 fprintf ((FILE), "\\%03o", ch); \
877 break; \
878 default: \
879 putc ('\\', (FILE)); \
880 putc (escape, (FILE)); \
881 break; \
882 } \
883 } \
884 fprintf ((FILE), "\"\n"); \
885 } \
886 while (0)
887
888 /* The routine used to output sequences of byte values. 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. Note that if we find subparts of the
892 character sequence which end with NUL (and which are shorter than
893 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
894
895 #undef ASM_OUTPUT_ASCII
896 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
897 do \
898 { \
899 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
900 register unsigned char *limit = _ascii_bytes + (LENGTH); \
901 register unsigned bytes_in_chunk = 0; \
902 for (; _ascii_bytes < limit; _ascii_bytes++) \
903 { \
904 register unsigned char *p; \
905 if (bytes_in_chunk >= 60) \
906 { \
907 fprintf ((FILE), "\"\n"); \
908 bytes_in_chunk = 0; \
909 } \
910 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
911 continue; \
912 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
913 { \
914 if (bytes_in_chunk > 0) \
915 { \
916 fprintf ((FILE), "\"\n"); \
917 bytes_in_chunk = 0; \
918 } \
919 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
920 _ascii_bytes = p; \
921 } \
922 else \
923 { \
924 register int escape; \
925 register unsigned ch; \
926 if (bytes_in_chunk == 0) \
927 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
928 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
929 { \
930 case 0: \
931 putc (ch, (FILE)); \
932 bytes_in_chunk++; \
933 break; \
934 case 1: \
935 fprintf ((FILE), "\\%03o", ch); \
936 bytes_in_chunk += 4; \
937 break; \
938 default: \
939 putc ('\\', (FILE)); \
940 putc (escape, (FILE)); \
941 bytes_in_chunk += 2; \
942 break; \
943 } \
944 } \
945 } \
946 if (bytes_in_chunk > 0) \
947 fprintf ((FILE), "\"\n"); \
948 } \
949 while (0)
950
951 /* All SVR4 targets use the ELF object file format. */
952 #define OBJECT_FORMAT_ELF