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[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 `ld' and `as' programs is the
110 /usr/ccs/bin directory. */
111
112 #undef MD_EXEC_PREFIX
113 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
114
115 /* Under svr4, the normal location of the various *crt*.o files is the
116 /usr/ccs/lib directory. */
117
118 #undef MD_STARTFILE_PREFIX
119 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
120
121 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
122 standard C library (unless we are building a shared library) followed by
123 our own magical crtend.o file (see crtstuff.c) which provides part of
124 the support for getting C++ file-scope static object constructed before
125 entering `main', followed by the normal svr3/svr4 "finalizer" file,
126 which is either `gcrtn.o' or `crtn.o'. */
127
128 #undef LIB_SPEC
129 #define LIB_SPEC \
130 "%{!shared:%{!symbolic:-lc}} \
131 crtend.o%s \
132 %{!shared:%{!symbolic:%{pg:gcrtn.o}%{!pg:crtn.o%s}}}"
133
134 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
135 for the special GCC options -static, -shared, and -symbolic which
136 allow us to link things in one of these three modes by applying the
137 appropriate combinations of options at link-time. We also provide
138 support here for as many of the other svr4 linker options as seems
139 reasonable, given that some of them conflict with options for other
140 svr4 tools (e.g. the assembler). In particular, we do support the
141 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
142 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
143 by gcc.c itself. We don't directly support the -m (generate load
144 map) option because that conflicts with the -m (run m4) option of
145 the svr4 assembler. We also don't directly support the svr4 linker's
146 -I* or -M* options because these conflict with existing GCC options.
147 We do however allow passing arbitrary options to the svr4 linker
148 via the -Wl, option. We don't support the svr4 linker's -a option
149 at all because it is totally useless and because it conflicts with
150 GCC's own -a option.
151
152 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
153
154 When the -G link option is used (-shared and -symbolic) a final link is
155 not being done. */
156
157 #undef LINK_SPEC
158 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
159 %{b} %{Wl,*:%*} \
160 %{static:-dn -Bstatic} \
161 %{shared:-G -dy} \
162 %{symbolic:-Bsymbolic -G -dy} \
163 %{G:-G} \
164 %{YP,*} \
165 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
166 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
167 %{Qy:} %{!Qn:-Qy}"
168
169 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
170 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
171 link step (depending upon the other gcc options selected, such as
172 -traditional and -ansi). These files each contain one (initialized)
173 copy of a special variable called `_lib_version'. Each one of these
174 files has `_lib_version' initialized to a different (enum) value.
175 The SVR4 library routines query the value of `_lib_version' at run
176 to decide how they should behave. Specifically, they decide (based
177 upon the value of `_lib_version') if they will act in a strictly ANSI
178 conforming manner or not.
179 */
180
181 #undef STARTFILE_SPEC
182 #define STARTFILE_SPEC "%{!shared: \
183 %{!symbolic: \
184 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
185 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
186 %{ansi:values-Xc.o%s} \
187 %{!ansi: \
188 %{traditional:values-Xt.o%s} \
189 %{!traditional:values-Xa.o%s}}}} crtbegin.o%s"
190
191 /* Attach a special .ident directive to the end of the file to identify
192 the version of GCC which compiled this code. The format of the
193 .ident string is patterned after the ones produced by native svr4
194 C compilers. */
195
196 #define ASM_FILE_END(FILE) \
197 do { \
198 fprintf ((FILE), "\t.ident\t\"GCC: (GNU) %s\"\n", \
199 version_string); \
200 } while (0)
201
202 /* Allow #sccs in preprocessor. */
203
204 #define SCCS_DIRECTIVE
205
206 /* Output #ident as a .ident. */
207
208 #define ASM_OUTPUT_IDENT(FILE, NAME) \
209 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
210
211 /* Use periods rather than dollar signs in special g++ assembler names. */
212
213 #define NO_DOLLAR_IN_LABEL
214
215 /* Writing `int' for a bitfield forces int alignment for the structure. */
216
217 #define PCC_BITFIELD_TYPE_MATTERS 1
218
219 /* Implicit library calls should use memcpy, not bcopy, etc. */
220
221 #define TARGET_MEM_FUNCTIONS
222
223 /* System V Release 4 uses DWARF debugging info. */
224
225 #define DWARF_DEBUGGING_INFO
226
227 /* The numbers used to denote specific machine registers in the System V
228 Release 4 DWARF debugging information are quite likely to be totally
229 different from the numbers used in BSD stabs debugging information
230 for the same kind of target machine. Thus, we undefine the macro
231 DBX_REGISTER_NUMBER here as an extra inducement to get people to
232 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
233 (which is also used to provide DWARF registers numbers in dwarfout.c)
234 in their tm.h files which include this file. */
235
236 #undef DBX_REGISTER_NUMBER
237
238 /* Define the actual types of some ANSI-mandated types. (These
239 definitions should work for most SVR4 systems). */
240
241 #undef SIZE_TYPE
242 #define SIZE_TYPE "unsigned int"
243
244 #undef PTRDIFF_TYPE
245 #define PTRDIFF_TYPE "int"
246
247 #undef WCHAR_TYPE
248 #define WCHAR_TYPE "long int"
249
250 #undef WCHAR_TYPE_SIZE
251 #define WCHAR_TYPE_SIZE BITS_PER_WORD
252
253 /* This causes trouble, because it requires the host machine
254 to support ANSI C. */
255 /* #define MULTIBYTE_CHARS */
256
257 #undef ASM_BYTE_OP
258 #define ASM_BYTE_OP ".byte"
259
260 #undef SET_ASM_OP
261 #define SET_ASM_OP ".set"
262
263 /* This is how to begin an assembly language file. Most svr4 assemblers want
264 at least a .file directive to come first, and some want to see a .version
265 directive come right after that. Here we just establish a default
266 which generates only the .file directive. If you need a .version
267 directive for any specific target, you should override this definition
268 in the target-specific file which includes this one. */
269
270 #undef ASM_FILE_START
271 #define ASM_FILE_START(FILE) \
272 output_file_directive ((FILE), main_input_filename)
273
274 /* This is how to allocate empty space in some section. The .zero
275 pseudo-op is used for this on most svr4 assemblers. */
276
277 #define SKIP_ASM_OP ".zero"
278
279 #undef ASM_OUTPUT_SKIP
280 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
281 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
282
283 /* This is how to output a reference to a user-level label named NAME.
284 `assemble_name' uses this.
285
286 For System V Release 4 the convention is *not* to prepend a leading
287 underscore onto user-level symbol names. */
288
289 #undef ASM_OUTPUT_LABELREF
290 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
291
292 /* This is how to output an internal numbered label where
293 PREFIX is the class of label and NUM is the number within the class.
294
295 For most svr4 systems, the convention is that any symbol which begins
296 with a period is not put into the linker symbol table by the assembler. */
297
298 #undef ASM_OUTPUT_INTERNAL_LABEL
299 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
300 do { \
301 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
302 } while (0)
303
304 /* This is how to store into the string LABEL
305 the symbol_ref name of an internal numbered label where
306 PREFIX is the class of label and NUM is the number within the class.
307 This is suitable for output with `assemble_name'.
308
309 For most svr4 systems, the convention is that any symbol which begins
310 with a period is not put into the linker symbol table by the assembler. */
311
312 #undef ASM_GENERATE_INTERNAL_LABEL
313 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
314 do { \
315 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
316 } while (0)
317
318 /* The standard SVR4 assembler seems to require that certain builtin
319 library routines (e.g. .udiv) be explicitly declared as .globl
320 in each assembly file where they are referenced. */
321
322 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
323 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
324
325 /* This says how to output assembler code to declare an
326 uninitialized external linkage data object. Under SVR4,
327 the linker seems to want the alignment of data objects
328 to depend on their types. We do exactly that here. */
329
330 #define COMMON_ASM_OP ".comm"
331
332 #undef ASM_OUTPUT_ALIGNED_COMMON
333 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
334 do { \
335 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
336 assemble_name ((FILE), (NAME)); \
337 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
338 } while (0)
339
340 /* This says how to output assembler code to declare an
341 uninitialized internal linkage data object. Under SVR4,
342 the linker seems to want the alignment of data objects
343 to depend on their types. We do exactly that here. */
344
345 #define LOCAL_ASM_OP ".local"
346
347 #undef ASM_OUTPUT_ALIGNED_LOCAL
348 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
349 do { \
350 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
351 assemble_name ((FILE), (NAME)); \
352 fprintf ((FILE), "\n"); \
353 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
354 } while (0)
355
356 /* This is the pseudo-op used to generate a 32-bit word of data with a
357 specific value in some section. This is the same for all known svr4
358 assemblers. */
359
360 #define INT_ASM_OP ".long"
361
362 /* This is the pseudo-op used to generate a contiguous sequence of byte
363 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
364 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
365
366 #undef ASCII_DATA_ASM_OP
367 #define ASCII_DATA_ASM_OP ".ascii"
368
369 /* Support const sections and the ctors and dtors sections for g++.
370 Note that there appears to be two different ways to support const
371 sections at the moment. You can either #define the symbol
372 READONLY_DATA_SECTION (giving it some code which switches to the
373 readonly data section) or else you can #define the symbols
374 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
375 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
376
377 #define USE_CONST_SECTION 1
378
379 #define CONST_SECTION_ASM_OP ".section\t.rodata"
380 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"a\",@progbits"
381 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"a\",@progbits"
382
383 /* On svr4, we *do* have support for the .init section, and we can put
384 stuff in there to be executed before `main'. We let crtstuff.c and
385 other files know this by defining the following symbol. The definition
386 says how to change sections to the .init section. This is the same
387 for all know svr4 assemblers. */
388
389 #define INIT_SECTION_ASM_OP ".section\t.init"
390
391 /* A default list of other sections which we might be "in" at any given
392 time. For targets that use additional sections (e.g. .tdesc) you
393 should override this definition in the target-specific file which
394 includes this file. */
395
396 #undef EXTRA_SECTIONS
397 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
398
399 /* A default list of extra section function definitions. For targets
400 that use additional sections (e.g. .tdesc) you should override this
401 definition in the target-specific file which includes this file. */
402
403 #undef EXTRA_SECTION_FUNCTIONS
404 #define EXTRA_SECTION_FUNCTIONS \
405 CONST_SECTION_FUNCTION \
406 CTORS_SECTION_FUNCTION \
407 DTORS_SECTION_FUNCTION
408
409 #define READONLY_DATA_SECTION() const_section ()
410
411 extern void text_section();
412
413 #define CONST_SECTION_FUNCTION \
414 void \
415 const_section () \
416 { \
417 if (!USE_CONST_SECTION) \
418 text_section(); \
419 else if (in_section != in_const) \
420 { \
421 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
422 in_section = in_const; \
423 } \
424 }
425
426 #define CTORS_SECTION_FUNCTION \
427 void \
428 ctors_section () \
429 { \
430 if (in_section != in_ctors) \
431 { \
432 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
433 in_section = in_ctors; \
434 } \
435 }
436
437 #define DTORS_SECTION_FUNCTION \
438 void \
439 dtors_section () \
440 { \
441 if (in_section != in_dtors) \
442 { \
443 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
444 in_section = in_dtors; \
445 } \
446 }
447
448 /* A C statement (sans semicolon) to output an element in the table of
449 global constructors. */
450 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
451 do { \
452 ctors_section (); \
453 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
454 assemble_name (FILE, NAME); \
455 fprintf (FILE, "\n"); \
456 } while (0)
457
458 /* A C statement (sans semicolon) to output an element in the table of
459 global destructors. */
460 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
461 do { \
462 dtors_section (); \
463 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
464 assemble_name (FILE, NAME); \
465 fprintf (FILE, "\n"); \
466 } while (0)
467
468 /* A C statement or statements to switch to the appropriate
469 section for output of DECL. DECL is either a `VAR_DECL' node
470 or a constant of some sort. RELOC indicates whether forming
471 the initial value of DECL requires link-time relocations. */
472
473 #define SELECT_SECTION(DECL,RELOC) \
474 { \
475 if (TREE_CODE (DECL) == STRING_CST) \
476 { \
477 if (! flag_writable_strings) \
478 const_section (); \
479 else \
480 data_section (); \
481 } \
482 else if (TREE_CODE (DECL) == VAR_DECL) \
483 { \
484 if ((flag_pic && RELOC) \
485 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
486 data_section (); \
487 else \
488 const_section (); \
489 } \
490 else \
491 const_section (); \
492 }
493
494 /* A C statement or statements to switch to the appropriate
495 section for output of RTX in mode MODE. RTX is some kind
496 of constant in RTL. The argument MODE is redundant except
497 in the case of a `const_int' rtx. Currently, these always
498 go into the const section. */
499
500 #undef SELECT_RTX_SECTION
501 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
502
503 /* Define the strings used for the special svr4 .type and .size directives.
504 These strings generally do not vary from one system running svr4 to
505 another, but if a given system (e.g. m88k running svr) needs to use
506 different pseudo-op names for these, they may be overridden in the
507 file which includes this one. */
508
509 #define TYPE_ASM_OP ".type"
510 #define SIZE_ASM_OP ".size"
511 #define WEAK_ASM_OP ".weak"
512
513 /* The following macro defines the format used to output the second
514 operand of the .type assembler directive. Different svr4 assemblers
515 expect various different forms for this operand. The one given here
516 is just a default. You may need to override it in your machine-
517 specific tm.h file (depending upon the particulars of your assembler). */
518
519 #define TYPE_OPERAND_FMT "@%s"
520
521 /* Write the extra assembler code needed to declare a function's result.
522 Most svr4 assemblers don't require any special declaration of the
523 result value, but there are exceptions. */
524
525 #ifndef ASM_DECLARE_RESULT
526 #define ASM_DECLARE_RESULT(FILE, RESULT)
527 #endif
528
529 /* These macros generate the special .type and .size directives which
530 are used to set the corresponding fields of the linker symbol table
531 entries in an ELF object file under SVR4. These macros also output
532 the starting labels for the relevant functions/objects. */
533
534 /* Write the extra assembler code needed to declare a function properly.
535 Some svr4 assemblers need to also have something extra said about the
536 function's return value. We allow for that here. */
537
538 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
539 do { \
540 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
541 assemble_name (FILE, NAME); \
542 putc (',', FILE); \
543 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
544 putc ('\n', FILE); \
545 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
546 ASM_OUTPUT_LABEL(FILE, NAME); \
547 } while (0)
548
549 /* Write the extra assembler code needed to declare an object properly. */
550
551 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
552 do { \
553 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
554 assemble_name (FILE, NAME); \
555 putc (',', FILE); \
556 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
557 putc ('\n', FILE); \
558 if (!flag_inhibit_size_directive) \
559 { \
560 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
561 assemble_name (FILE, NAME); \
562 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (decl))); \
563 } \
564 ASM_OUTPUT_LABEL(FILE, NAME); \
565 } while (0)
566
567 /* This is how to declare the size of a function. */
568
569 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
570 do { \
571 if (!flag_inhibit_size_directive) \
572 { \
573 char label[256]; \
574 static int labelno; \
575 labelno++; \
576 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
577 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
578 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
579 assemble_name (FILE, (FNAME)); \
580 fprintf (FILE, ","); \
581 assemble_name (FILE, label); \
582 fprintf (FILE, "-"); \
583 assemble_name (FILE, (FNAME)); \
584 putc ('\n', FILE); \
585 } \
586 } while (0)
587
588 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
589 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
590 corresponds to a particular byte value [0..255]. For any
591 given byte value, if the value in the corresponding table
592 position is zero, the given character can be output directly.
593 If the table value is 1, the byte must be output as a \ooo
594 octal escape. If the tables value is anything else, then the
595 byte value should be output as a \ followed by the value
596 in the table. Note that we can use standard UN*X escape
597 sequences for many control characters, but we don't use
598 \a to represent BEL because some svr4 assemblers (e.g. on
599 the i386) don't know about that. */
600
601 #define ESCAPES \
602 "\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\
603 \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\
604 \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\
605 \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\
606 \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\
607 \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\
608 \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\
609 \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"
610
611 /* Some svr4 assemblers have a limit on the number of characters which
612 can appear in the operand of a .string directive. If your assembler
613 has such a limitation, you should define STRING_LIMIT to reflect that
614 limit. Note that at least some svr4 assemblers have a limit on the
615 actual number of bytes in the double-quoted string, and that they
616 count each character in an escape sequence as one byte. Thus, an
617 escape sequence like \377 would count as four bytes.
618
619 If your target assembler doesn't support the .string directive, you
620 should define this to zero.
621 */
622
623 #define STRING_LIMIT ((unsigned) 256)
624
625 #define STRING_ASM_OP ".string"
626
627 /* The routine used to output NUL terminated strings. We use a special
628 version of this for most svr4 targets because doing so makes the
629 generated assembly code more compact (and thus faster to assemble)
630 as well as more readable, especially for targets like the i386
631 (where the only alternative is to output character sequences as
632 comma separated lists of numbers). */
633
634 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
635 do \
636 { \
637 register unsigned char *_limited_str = (unsigned char *) (STR); \
638 register unsigned ch; \
639 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
640 for (; ch = *_limited_str; _limited_str++) \
641 { \
642 register int escape; \
643 switch (escape = ESCAPES[ch]) \
644 { \
645 case 0: \
646 putc (ch, (FILE)); \
647 break; \
648 case 1: \
649 fprintf ((FILE), "\\%03o", ch); \
650 break; \
651 default: \
652 putc ('\\', (FILE)); \
653 putc (escape, (FILE)); \
654 break; \
655 } \
656 } \
657 fprintf ((FILE), "\"\n"); \
658 } \
659 while (0)
660
661 /* The routine used to output sequences of byte values. We use a special
662 version of this for most svr4 targets because doing so makes the
663 generated assembly code more compact (and thus faster to assemble)
664 as well as more readable. Note that if we find subparts of the
665 character sequence which end with NUL (and which are shorter than
666 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
667
668 #undef ASM_OUTPUT_ASCII
669 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
670 do \
671 { \
672 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
673 register unsigned char *limit = _ascii_bytes + (LENGTH); \
674 register unsigned bytes_in_chunk = 0; \
675 for (; _ascii_bytes < limit; _ascii_bytes++) \
676 { \
677 register unsigned char *p; \
678 if (bytes_in_chunk >= 60) \
679 { \
680 fprintf ((FILE), "\"\n"); \
681 bytes_in_chunk = 0; \
682 } \
683 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
684 continue; \
685 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
686 { \
687 if (bytes_in_chunk > 0) \
688 { \
689 fprintf ((FILE), "\"\n"); \
690 bytes_in_chunk = 0; \
691 } \
692 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
693 _ascii_bytes = p; \
694 } \
695 else \
696 { \
697 register int escape; \
698 register unsigned ch; \
699 if (bytes_in_chunk == 0) \
700 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
701 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
702 { \
703 case 0: \
704 putc (ch, (FILE)); \
705 bytes_in_chunk++; \
706 break; \
707 case 1: \
708 fprintf ((FILE), "\\%03o", ch); \
709 bytes_in_chunk += 4; \
710 break; \
711 default: \
712 putc ('\\', (FILE)); \
713 putc (escape, (FILE)); \
714 bytes_in_chunk += 2; \
715 break; \
716 } \
717 } \
718 } \
719 if (bytes_in_chunk > 0) \
720 fprintf ((FILE), "\"\n"); \
721 } \
722 while (0)