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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 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, 675 Mass Ave, Cambridge, MA 02139, USA.
21
22 To use this file, make up a file with a name like:
23
24 ?????svr4.h
25
26 where ????? is replaced by the name of the basic hardware that you
27 are targeting for. Then, in the file ?????svr4.h, put something
28 like:
29
30 #include "?????.h"
31 #include "svr4.h"
32
33 followed by any really system-specific defines (or overrides of
34 defines) which you find that you need. For example, CPP_PREDEFINES
35 is defined here with only the defined -Dunix and -DSVR4. You should
36 probably override that in your target-specific ?????svr4.h file
37 with a set of defines that includes these, but also contains an
38 appropriate define for the type of hardware that you are targeting.
39 */
40
41 /* Define a symbol indicating that we are using svr4.h. */
42 #define USING_SVR4_H
43
44 /* For the sake of libgcc2.c, indicate target supports atexit. */
45 #define HAVE_ATEXIT
46
47 /* Cpp, assembler, linker, library, and startfile spec's. */
48
49 /* This defines which switch letters take arguments. On svr4, most of
50 the normal cases (defined in gcc.c) apply, and we also have -h* and
51 -z* options (for the linker). Note however that there is no such
52 thing as a -T option for svr4. */
53
54 #define SWITCH_TAKES_ARG(CHAR) \
55 ( (CHAR) == 'D' \
56 || (CHAR) == 'U' \
57 || (CHAR) == 'o' \
58 || (CHAR) == 'e' \
59 || (CHAR) == 'u' \
60 || (CHAR) == 'I' \
61 || (CHAR) == 'm' \
62 || (CHAR) == 'L' \
63 || (CHAR) == 'A' \
64 || (CHAR) == 'h' \
65 || (CHAR) == 'z')
66
67 /* This defines which multi-letter switches take arguments. On svr4,
68 there are no such switches except those implemented by GCC itself. */
69
70 #define WORD_SWITCH_TAKES_ARG(STR) \
71 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
72 && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \
73 && strcmp (STR, "Tbss"))
74
75 /* You should redefine CPP_PREDEFINES in any file which includes this one.
76 The definition should be appropriate for the type of target system
77 involved, and it should include any -A (assertion) options which are
78 appropriate for the given target system. */
79 #undef CPP_PREDEFINES
80
81 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
82 many of the specialized svr4 assembler options as seems reasonable,
83 given that there are certain options which we can't (or shouldn't)
84 support directly due to the fact that they conflict with other options
85 for other svr4 tools (e.g. ld) or with other options for GCC itself.
86 For example, we don't support the -o (output file) or -R (remove
87 input file) options because GCC already handles these things. We
88 also don't support the -m (run m4) option for the assembler because
89 that conflicts with the -m (produce load map) option of the svr4
90 linker. We do however allow passing arbitrary options to the svr4
91 assembler via the -Wa, option.
92
93 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
94 option.
95 */
96
97 #undef ASM_SPEC
98 #define ASM_SPEC \
99 "%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
100
101 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
102 the -o option (and its argument) for some reason. If we try to put it
103 before the -o option, the assembler will try to read the file named as
104 the output file in the -o option as an input file (after it has already
105 written some stuff to it) and the binary stuff contained therein will
106 cause totally confuse the assembler, resulting in many spurious error
107 messages. */
108
109 #undef ASM_FINAL_SPEC
110 #define ASM_FINAL_SPEC "%{pipe:-}"
111
112 /* Under svr4, the normal location of the `ld' and `as' programs is the
113 /usr/ccs/bin directory. */
114
115 #undef MD_EXEC_PREFIX
116 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
117
118 /* Under svr4, the normal location of the various *crt*.o files is the
119 /usr/ccs/lib directory. */
120
121 #undef MD_STARTFILE_PREFIX
122 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
123
124 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
125 standard C library (unless we are building a shared library). */
126
127 #undef LIB_SPEC
128 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
129
130 /* Provide a LIBGCC_SPEC appropriate for svr4. We also want to exclude
131 libgcc when -symbolic. */
132
133 #undef LIBGCC_SPEC
134 #define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}"
135
136 /* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own
137 magical crtend.o file (see crtstuff.c) which provides part of the
138 support for getting C++ file-scope static object constructed before
139 entering `main', followed by the normal svr3/svr4 "finalizer" file,
140 which is either `gcrtn.o' or `crtn.o'. */
141
142 #undef ENDFILE_SPEC
143 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}"
144
145 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
146 for the special GCC options -static, -shared, and -symbolic which
147 allow us to link things in one of these three modes by applying the
148 appropriate combinations of options at link-time. We also provide
149 support here for as many of the other svr4 linker options as seems
150 reasonable, given that some of them conflict with options for other
151 svr4 tools (e.g. the assembler). In particular, we do support the
152 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
153 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
154 by gcc.c itself. We don't directly support the -m (generate load
155 map) option because that conflicts with the -m (run m4) option of
156 the svr4 assembler. We also don't directly support the svr4 linker's
157 -I* or -M* options because these conflict with existing GCC options.
158 We do however allow passing arbitrary options to the svr4 linker
159 via the -Wl, option. We don't support the svr4 linker's -a option
160 at all because it is totally useless and because it conflicts with
161 GCC's own -a option.
162
163 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
164
165 When the -G link option is used (-shared and -symbolic) a final link is
166 not being done. */
167
168 #undef LINK_SPEC
169 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
170 %{b} %{Wl,*:%*} \
171 %{static:-dn -Bstatic} \
172 %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \
173 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
174 %{G:-G} \
175 %{YP,*} \
176 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
177 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
178 %{Qy:} %{!Qn:-Qy}"
179
180 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
181 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
182 link step (depending upon the other gcc options selected, such as
183 -traditional and -ansi). These files each contain one (initialized)
184 copy of a special variable called `_lib_version'. Each one of these
185 files has `_lib_version' initialized to a different (enum) value.
186 The SVR4 library routines query the value of `_lib_version' at run
187 to decide how they should behave. Specifically, they decide (based
188 upon the value of `_lib_version') if they will act in a strictly ANSI
189 conforming manner or not.
190 */
191
192 #undef STARTFILE_SPEC
193 #define STARTFILE_SPEC "%{!shared: \
194 %{!symbolic: \
195 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
196 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
197 %{ansi:values-Xc.o%s} \
198 %{!ansi: \
199 %{traditional:values-Xt.o%s} \
200 %{!traditional:values-Xa.o%s}} \
201 crtbegin.o%s"
202
203 /* Attach a special .ident directive to the end of the file to identify
204 the version of GCC which compiled this code. The format of the
205 .ident string is patterned after the ones produced by native svr4
206 C compilers. */
207
208 #define IDENT_ASM_OP ".ident"
209
210 #define ASM_FILE_END(FILE) \
211 do { \
212 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
213 IDENT_ASM_OP, version_string); \
214 } while (0)
215
216 /* Allow #sccs in preprocessor. */
217
218 #define SCCS_DIRECTIVE
219
220 /* Output #ident as a .ident. */
221
222 #define ASM_OUTPUT_IDENT(FILE, NAME) \
223 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
224
225 /* Use periods rather than dollar signs in special g++ assembler names. */
226
227 #define NO_DOLLAR_IN_LABEL
228
229 /* Writing `int' for a bitfield forces int alignment for the structure. */
230
231 #define PCC_BITFIELD_TYPE_MATTERS 1
232
233 /* Implicit library calls should use memcpy, not bcopy, etc. */
234
235 #define TARGET_MEM_FUNCTIONS
236
237 /* Handle #pragma weak and #pragma pack. */
238
239 #define HANDLE_SYSV_PRAGMA
240
241 /* System V Release 4 uses DWARF debugging info. */
242
243 #define DWARF_DEBUGGING_INFO
244
245 /* The numbers used to denote specific machine registers in the System V
246 Release 4 DWARF debugging information are quite likely to be totally
247 different from the numbers used in BSD stabs debugging information
248 for the same kind of target machine. Thus, we undefine the macro
249 DBX_REGISTER_NUMBER here as an extra inducement to get people to
250 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
251 (which is also used to provide DWARF registers numbers in dwarfout.c)
252 in their tm.h files which include this file. */
253
254 #undef DBX_REGISTER_NUMBER
255
256 /* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
257 in general, although it will only work when using gas. */
258
259 #define DBX_DEBUGGING_INFO
260
261 /* Use DWARF debugging info by default. */
262
263 #ifndef PREFERRED_DEBUGGING_TYPE
264 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
265 #endif
266
267 /* Make LBRAC and RBRAC addresses relative to the start of the
268 function. The native Solaris stabs debugging format works this
269 way, gdb expects it, and it reduces the number of relocation
270 entries. */
271
272 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
273
274 /* When using stabs, gcc2_compiled must be a stabs entry, not an
275 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
276 the input piecemeal, starting with each N_SO, it's a lot easier if
277 the gcc2 flag symbol is *after* the N_SO rather than before it. So
278 we emit an N_OPT stab there. */
279
280 #define ASM_IDENTIFY_GCC(FILE) \
281 do \
282 { \
283 if (write_symbols != DBX_DEBUG) \
284 fputs ("gcc2_compiled.:\n", FILE); \
285 } \
286 while (0)
287
288 #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
289 do \
290 { \
291 if (write_symbols == DBX_DEBUG) \
292 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
293 } \
294 while (0)
295
296 /* Like block addresses, stabs line numbers are relative to the
297 current function. */
298
299 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
300 do \
301 { \
302 static int sym_lineno = 1; \
303 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
304 line, sym_lineno); \
305 assemble_name (file, \
306 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
307 fprintf (file, "\n.LM%d:\n", sym_lineno); \
308 sym_lineno += 1; \
309 } \
310 while (0)
311
312 /* In order for relative line numbers to work, we must output the
313 stabs entry for the function name first. */
314
315 #define DBX_FUNCTION_FIRST
316
317 /* Generate a blank trailing N_SO to mark the end of the .o file, since
318 we can't depend upon the linker to mark .o file boundaries with
319 embedded stabs. */
320
321 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
322 fprintf (FILE, \
323 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
324
325 /* Define the actual types of some ANSI-mandated types. (These
326 definitions should work for most SVR4 systems). */
327
328 #undef SIZE_TYPE
329 #define SIZE_TYPE "unsigned int"
330
331 #undef PTRDIFF_TYPE
332 #define PTRDIFF_TYPE "int"
333
334 #undef WCHAR_TYPE
335 #define WCHAR_TYPE "long int"
336
337 #undef WCHAR_TYPE_SIZE
338 #define WCHAR_TYPE_SIZE BITS_PER_WORD
339
340 /* This causes trouble, because it requires the host machine
341 to support ANSI C. */
342 /* #define MULTIBYTE_CHARS */
343
344 #undef ASM_BYTE_OP
345 #define ASM_BYTE_OP ".byte"
346
347 #undef SET_ASM_OP
348 #define SET_ASM_OP ".set"
349
350 /* This is how to begin an assembly language file. Most svr4 assemblers want
351 at least a .file directive to come first, and some want to see a .version
352 directive come right after that. Here we just establish a default
353 which generates only the .file directive. If you need a .version
354 directive for any specific target, you should override this definition
355 in the target-specific file which includes this one. */
356
357 #undef ASM_FILE_START
358 #define ASM_FILE_START(FILE) \
359 output_file_directive ((FILE), main_input_filename)
360
361 /* This is how to allocate empty space in some section. The .zero
362 pseudo-op is used for this on most svr4 assemblers. */
363
364 #define SKIP_ASM_OP ".zero"
365
366 #undef ASM_OUTPUT_SKIP
367 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
368 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
369
370 /* This is how to output a reference to a user-level label named NAME.
371 `assemble_name' uses this.
372
373 For System V Release 4 the convention is *not* to prepend a leading
374 underscore onto user-level symbol names. */
375
376 #undef ASM_OUTPUT_LABELREF
377 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
378
379 /* This is how to output an internal numbered label where
380 PREFIX is the class of label and NUM is the number within the class.
381
382 For most svr4 systems, the convention is that any symbol which begins
383 with a period is not put into the linker symbol table by the assembler. */
384
385 #undef ASM_OUTPUT_INTERNAL_LABEL
386 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
387 do { \
388 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
389 } while (0)
390
391 /* This is how to store into the string LABEL
392 the symbol_ref name of an internal numbered label where
393 PREFIX is the class of label and NUM is the number within the class.
394 This is suitable for output with `assemble_name'.
395
396 For most svr4 systems, the convention is that any symbol which begins
397 with a period is not put into the linker symbol table by the assembler. */
398
399 #undef ASM_GENERATE_INTERNAL_LABEL
400 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
401 do { \
402 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
403 } while (0)
404
405 /* Output the label which precedes a jumptable. Note that for all svr4
406 systems where we actually generate jumptables (which is to say every
407 svr4 target except i386, where we use casesi instead) we put the jump-
408 tables into the .rodata section and since other stuff could have been
409 put into the .rodata section prior to any given jumptable, we have to
410 make sure that the location counter for the .rodata section gets pro-
411 perly re-aligned prior to the actual beginning of the jump table. */
412
413 #define ALIGN_ASM_OP ".align"
414
415 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
416 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
417 ASM_OUTPUT_ALIGN ((FILE), 2);
418 #endif
419
420 #undef ASM_OUTPUT_CASE_LABEL
421 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
422 do { \
423 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
424 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
425 } while (0)
426
427 /* The standard SVR4 assembler seems to require that certain builtin
428 library routines (e.g. .udiv) be explicitly declared as .globl
429 in each assembly file where they are referenced. */
430
431 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
432 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
433
434 /* This says how to output assembler code to declare an
435 uninitialized external linkage data object. Under SVR4,
436 the linker seems to want the alignment of data objects
437 to depend on their types. We do exactly that here. */
438
439 #define COMMON_ASM_OP ".comm"
440
441 #undef ASM_OUTPUT_ALIGNED_COMMON
442 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
443 do { \
444 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
445 assemble_name ((FILE), (NAME)); \
446 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
447 } while (0)
448
449 /* This says how to output assembler code to declare an
450 uninitialized internal 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 LOCAL_ASM_OP ".local"
455
456 #undef ASM_OUTPUT_ALIGNED_LOCAL
457 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
458 do { \
459 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
460 assemble_name ((FILE), (NAME)); \
461 fprintf ((FILE), "\n"); \
462 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
463 } while (0)
464
465 /* This is the pseudo-op used to generate a 32-bit word of data with a
466 specific value in some section. This is the same for all known svr4
467 assemblers. */
468
469 #define INT_ASM_OP ".long"
470
471 /* This is the pseudo-op used to generate a contiguous sequence of byte
472 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
473 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
474
475 #undef ASCII_DATA_ASM_OP
476 #define ASCII_DATA_ASM_OP ".ascii"
477
478 /* Support const sections and the ctors and dtors sections for g++.
479 Note that there appears to be two different ways to support const
480 sections at the moment. You can either #define the symbol
481 READONLY_DATA_SECTION (giving it some code which switches to the
482 readonly data section) or else you can #define the symbols
483 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
484 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
485
486 #define USE_CONST_SECTION 1
487
488 #define CONST_SECTION_ASM_OP ".section\t.rodata"
489
490 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
491
492 Note that we want to give these sections the SHF_WRITE attribute
493 because these sections will actually contain data (i.e. tables of
494 addresses of functions in the current root executable or shared library
495 file) and, in the case of a shared library, the relocatable addresses
496 will have to be properly resolved/relocated (and then written into) by
497 the dynamic linker when it actually attaches the given shared library
498 to the executing process. (Note that on SVR4, you may wish to use the
499 `-z text' option to the ELF linker, when building a shared library, as
500 an additional check that you are doing everything right. But if you do
501 use the `-z text' option when building a shared library, you will get
502 errors unless the .ctors and .dtors sections are marked as writable
503 via the SHF_WRITE attribute.) */
504
505 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
506 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
507
508 /* On svr4, we *do* have support for the .init and .fini sections, and we
509 can put stuff in there to be executed before and after `main'. We let
510 crtstuff.c and other files know this by defining the following symbols.
511 The definitions say how to change sections to the .init and .fini
512 sections. This is the same for all known svr4 assemblers. */
513
514 #define INIT_SECTION_ASM_OP ".section\t.init"
515 #define FINI_SECTION_ASM_OP ".section\t.fini"
516
517 /* A default list of other sections which we might be "in" at any given
518 time. For targets that use additional sections (e.g. .tdesc) you
519 should override this definition in the target-specific file which
520 includes this file. */
521
522 #undef EXTRA_SECTIONS
523 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
524
525 /* A default list of extra section function definitions. For targets
526 that use additional sections (e.g. .tdesc) you should override this
527 definition in the target-specific file which includes this file. */
528
529 #undef EXTRA_SECTION_FUNCTIONS
530 #define EXTRA_SECTION_FUNCTIONS \
531 CONST_SECTION_FUNCTION \
532 CTORS_SECTION_FUNCTION \
533 DTORS_SECTION_FUNCTION
534
535 #define READONLY_DATA_SECTION() const_section ()
536
537 extern void text_section ();
538
539 #define CONST_SECTION_FUNCTION \
540 void \
541 const_section () \
542 { \
543 if (!USE_CONST_SECTION) \
544 text_section(); \
545 else if (in_section != in_const) \
546 { \
547 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
548 in_section = in_const; \
549 } \
550 }
551
552 #define CTORS_SECTION_FUNCTION \
553 void \
554 ctors_section () \
555 { \
556 if (in_section != in_ctors) \
557 { \
558 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
559 in_section = in_ctors; \
560 } \
561 }
562
563 #define DTORS_SECTION_FUNCTION \
564 void \
565 dtors_section () \
566 { \
567 if (in_section != in_dtors) \
568 { \
569 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
570 in_section = in_dtors; \
571 } \
572 }
573
574 /* Switch into a generic section.
575 This is currently only used to support section attributes.
576
577 We make the section read-only and executable for a function decl,
578 read-only for a const data decl, and writable for a non-const data decl. */
579 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
580 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \
581 TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
582 TREE_READONLY (DECL) ? "a" : "aw")
583
584
585 /* A C statement (sans semicolon) to output an element in the table of
586 global constructors. */
587 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
588 do { \
589 ctors_section (); \
590 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
591 assemble_name (FILE, NAME); \
592 fprintf (FILE, "\n"); \
593 } while (0)
594
595 /* A C statement (sans semicolon) to output an element in the table of
596 global destructors. */
597 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
598 do { \
599 dtors_section (); \
600 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
601 assemble_name (FILE, NAME); \
602 fprintf (FILE, "\n"); \
603 } while (0)
604
605 /* A C statement or statements to switch to the appropriate
606 section for output of DECL. DECL is either a `VAR_DECL' node
607 or a constant of some sort. RELOC indicates whether forming
608 the initial value of DECL requires link-time relocations. */
609
610 #define SELECT_SECTION(DECL,RELOC) \
611 { \
612 if (TREE_CODE (DECL) == STRING_CST) \
613 { \
614 if (! flag_writable_strings) \
615 const_section (); \
616 else \
617 data_section (); \
618 } \
619 else if (TREE_CODE (DECL) == VAR_DECL) \
620 { \
621 if ((flag_pic && RELOC) \
622 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
623 || !DECL_INITIAL (DECL) \
624 || (DECL_INITIAL (DECL) != error_mark_node \
625 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
626 data_section (); \
627 else \
628 const_section (); \
629 } \
630 else \
631 const_section (); \
632 }
633
634 /* A C statement or statements to switch to the appropriate
635 section for output of RTX in mode MODE. RTX is some kind
636 of constant in RTL. The argument MODE is redundant except
637 in the case of a `const_int' rtx. Currently, these always
638 go into the const section. */
639
640 #undef SELECT_RTX_SECTION
641 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
642
643 /* Define the strings used for the special svr4 .type and .size directives.
644 These strings generally do not vary from one system running svr4 to
645 another, but if a given system (e.g. m88k running svr) needs to use
646 different pseudo-op names for these, they may be overridden in the
647 file which includes this one. */
648
649 #define TYPE_ASM_OP ".type"
650 #define SIZE_ASM_OP ".size"
651
652 /* This is how we tell the assembler that a symbol is weak. */
653
654 #define ASM_WEAKEN_LABEL(FILE,NAME) \
655 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
656 fputc ('\n', FILE); } while (0)
657
658 /* The following macro defines the format used to output the second
659 operand of the .type assembler directive. Different svr4 assemblers
660 expect various different forms for this operand. The one given here
661 is just a default. You may need to override it in your machine-
662 specific tm.h file (depending upon the particulars of your assembler). */
663
664 #define TYPE_OPERAND_FMT "@%s"
665
666 /* Write the extra assembler code needed to declare a function's result.
667 Most svr4 assemblers don't require any special declaration of the
668 result value, but there are exceptions. */
669
670 #ifndef ASM_DECLARE_RESULT
671 #define ASM_DECLARE_RESULT(FILE, RESULT)
672 #endif
673
674 /* These macros generate the special .type and .size directives which
675 are used to set the corresponding fields of the linker symbol table
676 entries in an ELF object file under SVR4. These macros also output
677 the starting labels for the relevant functions/objects. */
678
679 /* Write the extra assembler code needed to declare a function properly.
680 Some svr4 assemblers need to also have something extra said about the
681 function's return value. We allow for that here. */
682
683 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
684 do { \
685 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
686 assemble_name (FILE, NAME); \
687 putc (',', FILE); \
688 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
689 putc ('\n', FILE); \
690 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
691 ASM_OUTPUT_LABEL(FILE, NAME); \
692 } while (0)
693
694 /* Write the extra assembler code needed to declare an object properly. */
695
696 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
697 do { \
698 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
699 assemble_name (FILE, NAME); \
700 putc (',', FILE); \
701 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
702 putc ('\n', FILE); \
703 size_directive_output = 0; \
704 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
705 { \
706 size_directive_output = 1; \
707 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
708 assemble_name (FILE, NAME); \
709 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
710 } \
711 ASM_OUTPUT_LABEL(FILE, NAME); \
712 } while (0)
713
714 /* Output the size directive for a decl in rest_of_decl_compilation
715 in the case where we did not do so before the initializer.
716 Once we find the error_mark_node, we know that the value of
717 size_directive_output was set
718 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
719
720 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
721 do { \
722 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
723 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
724 && ! AT_END && TOP_LEVEL \
725 && DECL_INITIAL (DECL) == error_mark_node \
726 && !size_directive_output) \
727 { \
728 size_directive_output = 1; \
729 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
730 assemble_name (FILE, name); \
731 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
732 } \
733 } while (0)
734
735 /* This is how to declare the size of a function. */
736
737 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
738 do { \
739 if (!flag_inhibit_size_directive) \
740 { \
741 char label[256]; \
742 static int labelno; \
743 labelno++; \
744 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
745 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
746 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
747 assemble_name (FILE, (FNAME)); \
748 fprintf (FILE, ","); \
749 assemble_name (FILE, label); \
750 fprintf (FILE, "-"); \
751 assemble_name (FILE, (FNAME)); \
752 putc ('\n', FILE); \
753 } \
754 } while (0)
755
756 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
757 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
758 corresponds to a particular byte value [0..255]. For any
759 given byte value, if the value in the corresponding table
760 position is zero, the given character can be output directly.
761 If the table value is 1, the byte must be output as a \ooo
762 octal escape. If the tables value is anything else, then the
763 byte value should be output as a \ followed by the value
764 in the table. Note that we can use standard UN*X escape
765 sequences for many control characters, but we don't use
766 \a to represent BEL because some svr4 assemblers (e.g. on
767 the i386) don't know about that. Also, we don't use \v
768 since some versions of gas, such as 2.2 did not accept it. */
769
770 #define ESCAPES \
771 "\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\
772 \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\
773 \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\
774 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\
775 \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\
776 \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\
777 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
778 \1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1"
779
780 /* Some svr4 assemblers have a limit on the number of characters which
781 can appear in the operand of a .string directive. If your assembler
782 has such a limitation, you should define STRING_LIMIT to reflect that
783 limit. Note that at least some svr4 assemblers have a limit on the
784 actual number of bytes in the double-quoted string, and that they
785 count each character in an escape sequence as one byte. Thus, an
786 escape sequence like \377 would count as four bytes.
787
788 If your target assembler doesn't support the .string directive, you
789 should define this to zero.
790 */
791
792 #define STRING_LIMIT ((unsigned) 256)
793
794 #define STRING_ASM_OP ".string"
795
796 /* The routine used to output NUL terminated strings. We use a special
797 version of this for most svr4 targets because doing so makes the
798 generated assembly code more compact (and thus faster to assemble)
799 as well as more readable, especially for targets like the i386
800 (where the only alternative is to output character sequences as
801 comma separated lists of numbers). */
802
803 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
804 do \
805 { \
806 register unsigned char *_limited_str = (unsigned char *) (STR); \
807 register unsigned ch; \
808 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
809 for (; ch = *_limited_str; _limited_str++) \
810 { \
811 register int escape; \
812 switch (escape = ESCAPES[ch]) \
813 { \
814 case 0: \
815 putc (ch, (FILE)); \
816 break; \
817 case 1: \
818 fprintf ((FILE), "\\%03o", ch); \
819 break; \
820 default: \
821 putc ('\\', (FILE)); \
822 putc (escape, (FILE)); \
823 break; \
824 } \
825 } \
826 fprintf ((FILE), "\"\n"); \
827 } \
828 while (0)
829
830 /* The routine used to output sequences of byte values. We use a special
831 version of this for most svr4 targets because doing so makes the
832 generated assembly code more compact (and thus faster to assemble)
833 as well as more readable. Note that if we find subparts of the
834 character sequence which end with NUL (and which are shorter than
835 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
836
837 #undef ASM_OUTPUT_ASCII
838 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
839 do \
840 { \
841 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
842 register unsigned char *limit = _ascii_bytes + (LENGTH); \
843 register unsigned bytes_in_chunk = 0; \
844 for (; _ascii_bytes < limit; _ascii_bytes++) \
845 { \
846 register unsigned char *p; \
847 if (bytes_in_chunk >= 60) \
848 { \
849 fprintf ((FILE), "\"\n"); \
850 bytes_in_chunk = 0; \
851 } \
852 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
853 continue; \
854 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
855 { \
856 if (bytes_in_chunk > 0) \
857 { \
858 fprintf ((FILE), "\"\n"); \
859 bytes_in_chunk = 0; \
860 } \
861 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
862 _ascii_bytes = p; \
863 } \
864 else \
865 { \
866 register int escape; \
867 register unsigned ch; \
868 if (bytes_in_chunk == 0) \
869 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
870 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
871 { \
872 case 0: \
873 putc (ch, (FILE)); \
874 bytes_in_chunk++; \
875 break; \
876 case 1: \
877 fprintf ((FILE), "\\%03o", ch); \
878 bytes_in_chunk += 4; \
879 break; \
880 default: \
881 putc ('\\', (FILE)); \
882 putc (escape, (FILE)); \
883 bytes_in_chunk += 2; \
884 break; \
885 } \
886 } \
887 } \
888 if (bytes_in_chunk > 0) \
889 fprintf ((FILE), "\"\n"); \
890 } \
891 while (0)
892
893 /* All SVR4 targets use the ELF object file format. */
894 #define OBJECT_FORMAT_ELF