projects / gcc.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
*** empty log message ***
[gcc.git] / gcc / config / svr4.h
1 /* svr4.h -- operating system specific defines to be used when
2 targeting GCC for some generic System V Release 4 system.
3 Copyright (C) 1991 Free Software Foundation, Inc.
4
5 Written by Ron Guilmette (rfg@ncd.com).
6
7 This file is part of GNU CC.
8
9 GNU CC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
13
14 GNU CC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with GNU CC; see the file COPYING. If not, write to
21 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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 /* For the sake of libgcc2.c, indicate target supports atexit. */
43 #define HAVE_ATEXIT
44
45 /* Cpp, assembler, linker, library, and startfile spec's. */
46
47 /* This defines which switch letters take arguments. On svr4, most of
48 the normal cases (defined in gcc.c) apply, and we also have -h* and
49 -z* options (for the linker). Note however that there is no such
50 thing as a -T option for svr4. */
51
52 #define SWITCH_TAKES_ARG(CHAR) \
53 ( (CHAR) == 'D' \
54 || (CHAR) == 'U' \
55 || (CHAR) == 'o' \
56 || (CHAR) == 'e' \
57 || (CHAR) == 'u' \
58 || (CHAR) == 'I' \
59 || (CHAR) == 'm' \
60 || (CHAR) == 'L' \
61 || (CHAR) == 'A' \
62 || (CHAR) == 'h' \
63 || (CHAR) == 'z')
64
65 /* This defines which multi-letter switches take arguments. On svr4,
66 there are no such switches except those implemented by GCC itself. */
67
68 #define WORD_SWITCH_TAKES_ARG(STR) \
69 (!strcmp (STR, "include") || !strcmp (STR, "imacros") \
70 || !strcmp (STR, "aux-info"))
71
72 /* You should redefine CPP_PREDEFINES in any file which includes this one.
73 The definition should be appropriate for the type of target system
74 involved, and it should include any -A (assertion) options which are
75 appropriate for the given target system. */
76 #undef CPP_PREDEFINES
77
78 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
79 many of the specialized svr4 assembler options as seems reasonable,
80 given that there are certain options which we can't (or shouldn't)
81 support directly due to the fact that they conflict with other options
82 for other svr4 tools (e.g. ld) or with other options for GCC itself.
83 For example, we don't support the -o (output file) or -R (remove
84 input file) options because GCC already handles these things. We
85 also don't support the -m (run m4) option for the assembler because
86 that conflicts with the -m (produce load map) option of the svr4
87 linker. We do however allow passing arbitrary options to the svr4
88 assembler via the -Wa, option.
89
90 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
91 option.
92 */
93
94 #undef ASM_SPEC
95 #define ASM_SPEC \
96 "%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
97
98 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
99 the -o option (and its argument) for some reason. If we try to put it
100 before the -o option, the assembler will try to read the file named as
101 the output file in the -o option as an input file (after it has already
102 written some stuff to it) and the binary stuff contained therein will
103 cause totally confuse the assembler, resulting in many spurious error
104 messages. */
105
106 #undef ASM_FINAL_SPEC
107 #define ASM_FINAL_SPEC "%{pipe:-}"
108
109 /* Under svr4, the normal location of the various *crt*.o files is the
110 /usr/ccs/lib directory. */
111
112 #undef MD_STARTFILE_PREFIX
113 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
114
115 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
116 standard C library (unless we are building a shared library) followed by
117 our own magical crtend.o file (see crtstuff.c) which provides part of
118 the support for getting C++ file-scope static object constructed before
119 entering `main', followed by the normal svr3/svr4 "finalizer" file,
120 which is either `gcrtn.o' or `crtn.o'. */
121
122 #undef LIB_SPEC
123 #define LIB_SPEC \
124 "%{!shared:%{!symbolic:-lc}} \
125 crtend.o%s \
126 %{!shared:%{!symbolic:%{pg:gcrtn.o}%{!pg:crtn.o%s}}}"
127
128 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
129 for the special GCC options -static, -shared, and -symbolic which
130 allow us to link things in one of these three modes by applying the
131 appropriate combinations of options at link-time. We also provide
132 support here for as many of the other svr4 linker options as seems
133 reasonable, given that some of them conflict with options for other
134 svr4 tools (e.g. the assembler). In particular, we do support the
135 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
136 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
137 by gcc.c itself. We don't directly support the -m (generate load
138 map) option because that conflicts with the -m (run m4) option of
139 the svr4 assembler. We also don't directly support the svr4 linker's
140 -I* or -M* options because these conflict with existing GCC options.
141 We do however allow passing arbitrary options to the svr4 linker
142 via the -Wl, option. We don't support the svr4 linker's -a option
143 at all because it is totally useless and because it conflicts with
144 GCC's own -a option.
145
146 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
147
148 When the -G link option is used (-shared and -symbolic) a final link is
149 not being done. */
150
151 #undef LINK_SPEC
152 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
153 %{b} %{Wl,*:%*} \
154 %{static:-dn -Bstatic} \
155 %{shared:-G -dy} \
156 %{symbolic:-Bsymbolic -G -dy} \
157 %{G:-G} \
158 %{YP,*} \
159 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
160 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
161 %{Qy:} %{!Qn:-Qy}"
162
163 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
164 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
165 link step (depending upon the other gcc options selected, such as
166 -traditional and -ansi). These files each contain one (initialized)
167 copy of a special variable called `_lib_version'. Each one of these
168 files has `_lib_version' initialized to a different (enum) value.
169 The SVR4 library routines query the value of `_lib_version' at run
170 to decide how they should behave. Specifically, they decide (based
171 upon the value of `_lib_version') if they will act in a strictly ANSI
172 conforming manner or not.
173 */
174
175 #undef STARTFILE_SPEC
176 #define STARTFILE_SPEC "%{!shared: \
177 %{!symbolic: \
178 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
179 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
180 %{ansi:values-Xc.o%s} \
181 %{!ansi: \
182 %{traditional:values-Xt.o%s} \
183 %{!traditional:values-Xa.o%s}}}} crtbegin.o%s"
184
185 /* Attach a special .ident directive to the end of the file to identify
186 the version of GCC which compiled this code. The format of the
187 .ident string is patterned after the ones produced by native svr4
188 C compilers. */
189
190 #define ASM_FILE_END(FILE) \
191 do { \
192 fprintf ((FILE), "\t.ident\t\"GCC: (GNU) %s\"\n", \
193 version_string); \
194 } while (0)
195
196 /* Allow #sccs in preprocessor. */
197
198 #define SCCS_DIRECTIVE
199
200 /* Output #ident as a .ident. */
201
202 #define ASM_OUTPUT_IDENT(FILE, NAME) \
203 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
204
205 /* Use periods rather than dollar signs in special g++ assembler names. */
206
207 #define NO_DOLLAR_IN_LABEL
208
209 /* Writing `int' for a bitfield forces int alignment for the structure. */
210
211 #define PCC_BITFIELD_TYPE_MATTERS 1
212
213 /* Implicit library calls should use memcpy, not bcopy, etc. */
214
215 #define TARGET_MEM_FUNCTIONS
216
217 /* System V Release 4 uses DWARF debugging info. */
218
219 #define DWARF_DEBUGGING_INFO
220
221 /* The numbers used to denote specific machine registers in the System V
222 Release 4 DWARF debugging information are quite likely to be totally
223 different from the numbers used in BSD stabs debugging information
224 for the same kind of target machine. Thus, we undefine the macro
225 DBX_REGISTER_NUMBER here as an extra inducement to get people to
226 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
227 (which is also used to provide DWARF registers numbers in dwarfout.c)
228 in their tm.h files which include this file. */
229
230 #undef DBX_REGISTER_NUMBER
231
232 /* Define the actual types of some ANSI-mandated types. (These
233 definitions should work for most SVR4 systems). */
234
235 #undef SIZE_TYPE
236 #define SIZE_TYPE "unsigned int"
237
238 #undef PTRDIFF_TYPE
239 #define PTRDIFF_TYPE "int"
240
241 #undef WCHAR_TYPE
242 #define WCHAR_TYPE "long int"
243
244 #undef WCHAR_TYPE_SIZE
245 #define WCHAR_TYPE_SIZE BITS_PER_WORD
246
247 /* This causes trouble, because it requires the host machine
248 to support ANSI C. */
249 /* #define MULTIBYTE_CHARS */
250
251 #undef ASM_BYTE_OP
252 #define ASM_BYTE_OP ".byte"
253
254 #undef SET_ASM_OP
255 #define SET_ASM_OP ".set"
256
257 /* This is how to begin an assembly language file. Most svr4 assemblers want
258 at least a .file directive to come first, and some want to see a .version
259 directive come right after that. Here we just establish a default
260 which generates only the .file directive. If you need a .version
261 directive for any specific target, you should override this definition
262 in the target-specific file which includes this one. */
263
264 #undef ASM_FILE_START
265 #define ASM_FILE_START(FILE) \
266 output_file_directive ((FILE), main_input_filename)
267
268 /* This is how to allocate empty space in some section. The .zero
269 pseudo-op is used for this on most svr4 assemblers. */
270
271 #define SKIP_ASM_OP ".zero"
272
273 #undef ASM_OUTPUT_SKIP
274 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
275 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
276
277 /* This is how to output a reference to a user-level label named NAME.
278 `assemble_name' uses this.
279
280 For System V Release 4 the convention is *not* to prepend a leading
281 underscore onto user-level symbol names. */
282
283 #undef ASM_OUTPUT_LABELREF
284 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
285
286 /* This is how to output an internal numbered label where
287 PREFIX is the class of label and NUM is the number within the class.
288
289 For most svr4 systems, the convention is that any symbol which begins
290 with a period is not put into the linker symbol table by the assembler. */
291
292 #undef ASM_OUTPUT_INTERNAL_LABEL
293 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
294 do { \
295 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
296 } while (0)
297
298 /* This is how to store into the string LABEL
299 the symbol_ref name of an internal numbered label where
300 PREFIX is the class of label and NUM is the number within the class.
301 This is suitable for output with `assemble_name'.
302
303 For most svr4 systems, the convention is that any symbol which begins
304 with a period is not put into the linker symbol table by the assembler. */
305
306 #undef ASM_GENERATE_INTERNAL_LABEL
307 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
308 do { \
309 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
310 } while (0)
311
312 /* The standard SVR4 assembler seems to require that certain builtin
313 library routines (e.g. .udiv) be explicitly declared as .globl
314 in each assembly file where they are referenced. */
315
316 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
317 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
318
319 /* This says how to output assembler code to declare an
320 uninitialized external linkage data object. Under SVR4,
321 the linker seems to want the alignment of data objects
322 to depend on their types. We do exactly that here. */
323
324 #define COMMON_ASM_OP ".comm"
325
326 #undef ASM_OUTPUT_ALIGNED_COMMON
327 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
328 do { \
329 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
330 assemble_name ((FILE), (NAME)); \
331 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
332 } while (0)
333
334 /* This says how to output assembler code to declare an
335 uninitialized internal linkage data object. Under SVR4,
336 the linker seems to want the alignment of data objects
337 to depend on their types. We do exactly that here. */
338
339 #define LOCAL_ASM_OP ".local"
340
341 #undef ASM_OUTPUT_ALIGNED_LOCAL
342 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
343 do { \
344 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
345 assemble_name ((FILE), (NAME)); \
346 fprintf ((FILE), "\n"); \
347 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
348 } while (0)
349
350 /* This is the pseudo-op used to generate a 32-bit word of data with a
351 specific value in some section. This is the same for all known svr4
352 assemblers. */
353
354 #define INT_ASM_OP ".long"
355
356 /* This is the pseudo-op used to generate a contiguous sequence of byte
357 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
358 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
359
360 #undef ASCII_DATA_ASM_OP
361 #define ASCII_DATA_ASM_OP ".ascii"
362
363 /* Support const sections and the ctors and dtors sections for g++.
364 Note that there appears to be two different ways to support const
365 sections at the moment. You can either #define the symbol
366 READONLY_DATA_SECTION (giving it some code which switches to the
367 readonly data section) or else you can #define the symbols
368 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
369 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
370
371 #define USE_CONST_SECTION 1
372
373 #define CONST_SECTION_ASM_OP ".section\t.rodata"
374 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"a\",@progbits"
375 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"a\",@progbits"
376
377 /* On svr4, we *do* have support for the .init section, and we can put
378 stuff in there to be executed before `main'. We let crtstuff.c and
379 other files know this by defining the following symbol. The definition
380 says how to change sections to the .init section. This is the same
381 for all know svr4 assemblers. */
382
383 #define INIT_SECTION_ASM_OP ".section\t.init"
384
385 /* A default list of other sections which we might be "in" at any given
386 time. For targets that use additional sections (e.g. .tdesc) you
387 should override this definition in the target-specific file which
388 includes this file. */
389
390 #undef EXTRA_SECTIONS
391 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
392
393 /* A default list of extra section function definitions. For targets
394 that use additional sections (e.g. .tdesc) you should override this
395 definition in the target-specific file which includes this file. */
396
397 #undef EXTRA_SECTION_FUNCTIONS
398 #define EXTRA_SECTION_FUNCTIONS \
399 CONST_SECTION_FUNCTION \
400 CTORS_SECTION_FUNCTION \
401 DTORS_SECTION_FUNCTION
402
403 #define READONLY_DATA_SECTION() const_section ()
404
405 extern void text_section();
406
407 #define CONST_SECTION_FUNCTION \
408 void \
409 const_section () \
410 { \
411 if (!USE_CONST_SECTION) \
412 text_section(); \
413 else if (in_section != in_const) \
414 { \
415 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
416 in_section = in_const; \
417 } \
418 }
419
420 #define CTORS_SECTION_FUNCTION \
421 void \
422 ctors_section () \
423 { \
424 if (in_section != in_ctors) \
425 { \
426 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
427 in_section = in_ctors; \
428 } \
429 }
430
431 #define DTORS_SECTION_FUNCTION \
432 void \
433 dtors_section () \
434 { \
435 if (in_section != in_dtors) \
436 { \
437 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
438 in_section = in_dtors; \
439 } \
440 }
441
442 /* A C statement (sans semicolon) to output an element in the table of
443 global constructors. */
444 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
445 do { \
446 ctors_section (); \
447 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
448 assemble_name (FILE, NAME); \
449 fprintf (FILE, "\n"); \
450 } while (0)
451
452 /* A C statement (sans semicolon) to output an element in the table of
453 global destructors. */
454 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
455 do { \
456 dtors_section (); \
457 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
458 assemble_name (FILE, NAME); \
459 fprintf (FILE, "\n"); \
460 } while (0)
461
462 /* A C statement or statements to switch to the appropriate
463 section for output of DECL. DECL is either a `VAR_DECL' node
464 or a constant of some sort. RELOC indicates whether forming
465 the initial value of DECL requires link-time relocations. */
466
467 #define SELECT_SECTION(DECL,RELOC) \
468 { \
469 if (TREE_CODE (DECL) == STRING_CST) \
470 { \
471 if (! flag_writable_strings) \
472 const_section (); \
473 else \
474 data_section (); \
475 } \
476 else if (TREE_CODE (DECL) == VAR_DECL) \
477 { \
478 if ((flag_pic && RELOC) \
479 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
480 data_section (); \
481 else \
482 const_section (); \
483 } \
484 else \
485 const_section (); \
486 }
487
488 /* A C statement or statements to switch to the appropriate
489 section for output of RTX in mode MODE. RTX is some kind
490 of constant in RTL. The argument MODE is redundant except
491 in the case of a `const_int' rtx. Currently, these always
492 go into the const section. */
493
494 #undef SELECT_RTX_SECTION
495 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
496
497 /* Define the strings used for the special svr4 .type and .size directives.
498 These strings generally do not vary from one system running svr4 to
499 another, but if a given system (e.g. m88k running svr) needs to use
500 different pseudo-op names for these, they may be overridden in the
501 file which includes this one. */
502
503 #define TYPE_ASM_OP ".type"
504 #define SIZE_ASM_OP ".size"
505 #define WEAK_ASM_OP ".weak"
506
507 /* The following macro defines the format used to output the second
508 operand of the .type assembler directive. Different svr4 assemblers
509 expect various different forms for this operand. The one given here
510 is just a default. You may need to override it in your machine-
511 specific tm.h file (depending upon the particulars of your assembler). */
512
513 #define TYPE_OPERAND_FMT "@%s"
514
515 /* Write the extra assembler code needed to declare a function's result.
516 Most svr4 assemblers don't require any special declaration of the
517 result value, but there are exceptions. */
518
519 #ifndef ASM_DECLARE_RESULT
520 #define ASM_DECLARE_RESULT(FILE, RESULT)
521 #endif
522
523 /* These macros generate the special .type and .size directives which
524 are used to set the corresponding fields of the linker symbol table
525 entries in an ELF object file under SVR4. These macros also output
526 the starting labels for the relevant functions/objects. */
527
528 /* Write the extra assembler code needed to declare a function properly.
529 Some svr4 assemblers need to also have something extra said about the
530 function's return value. We allow for that here. */
531
532 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
533 do { \
534 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
535 assemble_name (FILE, NAME); \
536 putc (',', FILE); \
537 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
538 putc ('\n', FILE); \
539 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
540 ASM_OUTPUT_LABEL(FILE, NAME); \
541 } while (0)
542
543 /* Write the extra assembler code needed to declare an object properly. */
544
545 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
546 do { \
547 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
548 assemble_name (FILE, NAME); \
549 putc (',', FILE); \
550 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
551 putc ('\n', FILE); \
552 if (!flag_inhibit_size_directive) \
553 { \
554 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
555 assemble_name (FILE, NAME); \
556 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (decl))); \
557 } \
558 ASM_OUTPUT_LABEL(FILE, NAME); \
559 } while (0)
560
561 /* This is how to declare the size of a function. */
562
563 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
564 do { \
565 if (!flag_inhibit_size_directive) \
566 { \
567 char label[256]; \
568 static int labelno; \
569 labelno++; \
570 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
571 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
572 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
573 assemble_name (FILE, (FNAME)); \
574 fprintf (FILE, ","); \
575 assemble_name (FILE, label); \
576 fprintf (FILE, "-"); \
577 assemble_name (FILE, (FNAME)); \
578 putc ('\n', FILE); \
579 } \
580 } while (0)
581
582 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
583 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
584 corresponds to a particular byte value [0..255]. For any
585 given byte value, if the value in the corresponding table
586 position is zero, the given character can be output directly.
587 If the table value is 1, the byte must be output as a \ooo
588 octal escape. If the tables value is anything else, then the
589 byte value should be output as a \ followed by the value
590 in the table. Note that we can use standard UN*X escape
591 sequences for many control characters, but we don't use
592 \a to represent BEL because some svr4 assemblers (e.g. on
593 the i386) don't know about that. */
594
595 #define ESCAPES \
596 "\1\1\1\1\1\1\1\1btnvfr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
597 \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\
598 \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\
599 \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\
600 \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\
601 \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\
602 \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\
603 \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"
604
605 /* Some svr4 assemblers have a limit on the number of characters which
606 can appear in the operand of a .string directive. If your assembler
607 has such a limitation, you should define STRING_LIMIT to reflect that
608 limit. Note that at least some svr4 assemblers have a limit on the
609 actual number of bytes in the double-quoted string, and that they
610 count each character in an escape sequence as one byte. Thus, an
611 escape sequence like \377 would count as four bytes.
612
613 If your target assembler doesn't support the .string directive, you
614 should define this to zero.
615 */
616
617 #define STRING_LIMIT ((unsigned) 256)
618
619 #define STRING_ASM_OP ".string"
620
621 /* The routine used to output NUL terminated strings. We use a special
622 version of this for most svr4 targets because doing so makes the
623 generated assembly code more compact (and thus faster to assemble)
624 as well as more readable, especially for targets like the i386
625 (where the only alternative is to output character sequences as
626 comma separated lists of numbers). */
627
628 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
629 do \
630 { \
631 register unsigned char *_limited_str = (unsigned char *) (STR); \
632 register unsigned ch; \
633 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
634 for (; ch = *_limited_str; _limited_str++) \
635 { \
636 register int escape; \
637 switch (escape = ESCAPES[ch]) \
638 { \
639 case 0: \
640 putc (ch, (FILE)); \
641 break; \
642 case 1: \
643 fprintf ((FILE), "\\%03o", ch); \
644 break; \
645 default: \
646 putc ('\\', (FILE)); \
647 putc (escape, (FILE)); \
648 break; \
649 } \
650 } \
651 fprintf ((FILE), "\"\n"); \
652 } \
653 while (0)
654
655 /* The routine used to output sequences of byte values. We use a special
656 version of this for most svr4 targets because doing so makes the
657 generated assembly code more compact (and thus faster to assemble)
658 as well as more readable. Note that if we find subparts of the
659 character sequence which end with NUL (and which are shorter than
660 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
661
662 #undef ASM_OUTPUT_ASCII
663 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
664 do \
665 { \
666 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
667 register unsigned char *limit = _ascii_bytes + (LENGTH); \
668 register unsigned bytes_in_chunk = 0; \
669 for (; _ascii_bytes < limit; _ascii_bytes++) \
670 { \
671 register unsigned char *p; \
672 if (bytes_in_chunk >= 60) \
673 { \
674 fprintf ((FILE), "\"\n"); \
675 bytes_in_chunk = 0; \
676 } \
677 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
678 continue; \
679 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
680 { \
681 if (bytes_in_chunk > 0) \
682 { \
683 fprintf ((FILE), "\"\n"); \
684 bytes_in_chunk = 0; \
685 } \
686 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
687 _ascii_bytes = p; \
688 } \
689 else \
690 { \
691 register int escape; \
692 register unsigned ch; \
693 if (bytes_in_chunk == 0) \
694 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
695 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
696 { \
697 case 0: \
698 putc (ch, (FILE)); \
699 bytes_in_chunk++; \
700 break; \
701 case 1: \
702 fprintf ((FILE), "\\%03o", ch); \
703 bytes_in_chunk += 4; \
704 break; \
705 default: \
706 putc ('\\', (FILE)); \
707 putc (escape, (FILE)); \
708 bytes_in_chunk += 2; \
709 break; \
710 } \
711 } \
712 } \
713 if (bytes_in_chunk > 0) \
714 fprintf ((FILE), "\"\n"); \
715 } \
716 while (0)