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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [gcc/] [config/] [elfos.h] - Blame information for rev 12

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1 12 jlechner
/* elfos.h  --  operating system specific defines to be used when
2
   targeting GCC for some generic ELF system
3
   Copyright (C) 1991, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004
4
   Free Software Foundation, Inc.
5
   Based on svr4.h contributed by Ron Guilmette (rfg@netcom.com).
6
 
7
This file is part of GCC.
8
 
9
GCC 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
GCC 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 GCC; see the file COPYING.  If not, write to
21
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22
Boston, MA 02110-1301, USA.  */
23
 
24
#define TARGET_OBJFMT_CPP_BUILTINS()            \
25
  do                                            \
26
    {                                           \
27
        builtin_define ("__ELF__");             \
28
    }                                           \
29
  while (0)
30
 
31
/* Define a symbol indicating that we are using elfos.h.
32
   Some CPU specific configuration files use this.  */
33
#define USING_ELFOS_H
34
 
35
/* The prefix to add to user-visible assembler symbols.
36
 
37
   For ELF systems the convention is *not* to prepend a leading
38
   underscore onto user-level symbol names.  */
39
 
40
#undef  USER_LABEL_PREFIX
41
#define USER_LABEL_PREFIX ""
42
 
43
/* Biggest alignment supported by the object file format of this
44
   machine.  Use this macro to limit the alignment which can be
45
   specified using the `__attribute__ ((aligned (N)))' construct.  If
46
   not defined, the default value is `BIGGEST_ALIGNMENT'.  */
47
#ifndef MAX_OFILE_ALIGNMENT
48
#define MAX_OFILE_ALIGNMENT (32768 * 8)
49
#endif
50
 
51
/* Use periods rather than dollar signs in special g++ assembler names.  */
52
 
53
#define NO_DOLLAR_IN_LABEL
54
 
55
/* Writing `int' for a bit-field forces int alignment for the structure.  */
56
 
57
#ifndef PCC_BITFIELD_TYPE_MATTERS
58
#define PCC_BITFIELD_TYPE_MATTERS 1
59
#endif
60
 
61
/* Handle #pragma weak and #pragma pack.  */
62
 
63
#define HANDLE_SYSV_PRAGMA 1
64
 
65
/* All ELF targets can support DWARF-2.  */
66
 
67
#define DWARF2_DEBUGGING_INFO 1
68
 
69
/* The GNU tools operate better with dwarf2, and it is required by some
70
   psABI's.  Since we don't have any native tools to be compatible with,
71
   default to dwarf2.  */
72
 
73
#ifndef PREFERRED_DEBUGGING_TYPE
74
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
75
#endif
76
 
77
/* All SVR4 targets use the ELF object file format.  */
78
#define OBJECT_FORMAT_ELF
79
 
80
 
81
/* Output #ident as a .ident.  */
82
 
83
#define ASM_OUTPUT_IDENT(FILE, NAME) \
84
  fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
85
 
86
#define IDENT_ASM_OP "\t.ident\t"
87
 
88
#undef  SET_ASM_OP
89
#define SET_ASM_OP      "\t.set\t"
90
 
91
/* Most svr4 assemblers want a .file directive at the beginning of
92
   their input file.  */
93
#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
94
 
95
/* This is how to allocate empty space in some section.  The .zero
96
   pseudo-op is used for this on most svr4 assemblers.  */
97
 
98
#define SKIP_ASM_OP     "\t.zero\t"
99
 
100
#undef  ASM_OUTPUT_SKIP
101
#define ASM_OUTPUT_SKIP(FILE, SIZE) \
102
   fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
103
            SKIP_ASM_OP, (SIZE))
104
 
105
/* This is how to store into the string LABEL
106
   the symbol_ref name of an internal numbered label where
107
   PREFIX is the class of label and NUM is the number within the class.
108
   This is suitable for output with `assemble_name'.
109
 
110
   For most svr4 systems, the convention is that any symbol which begins
111
   with a period is not put into the linker symbol table by the assembler.  */
112
 
113
#undef  ASM_GENERATE_INTERNAL_LABEL
114
#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM)         \
115
  do                                                            \
116
    {                                                           \
117
      sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM));      \
118
    }                                                           \
119
  while (0)
120
 
121
/* Output the label which precedes a jumptable.  Note that for all svr4
122
   systems where we actually generate jumptables (which is to say every
123
   svr4 target except i386, where we use casesi instead) we put the jump-
124
   tables into the .rodata section and since other stuff could have been
125
   put into the .rodata section prior to any given jumptable, we have to
126
   make sure that the location counter for the .rodata section gets pro-
127
   perly re-aligned prior to the actual beginning of the jump table.  */
128
 
129
#undef ALIGN_ASM_OP
130
#define ALIGN_ASM_OP "\t.align\t"
131
 
132
#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
133
#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
134
  ASM_OUTPUT_ALIGN ((FILE), 2);
135
#endif
136
 
137
#undef  ASM_OUTPUT_CASE_LABEL
138
#define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE)             \
139
  do                                                                    \
140
    {                                                                   \
141
      ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE)       \
142
        (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM);                  \
143
    }                                                                   \
144
  while (0)
145
 
146
/* The standard SVR4 assembler seems to require that certain builtin
147
   library routines (e.g. .udiv) be explicitly declared as .globl
148
   in each assembly file where they are referenced.  */
149
 
150
#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN)  \
151
  (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
152
 
153
/* This says how to output assembler code to declare an
154
   uninitialized external linkage data object.  Under SVR4,
155
   the linker seems to want the alignment of data objects
156
   to depend on their types.  We do exactly that here.  */
157
 
158
#define COMMON_ASM_OP   "\t.comm\t"
159
 
160
#undef  ASM_OUTPUT_ALIGNED_COMMON
161
#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
162
  do                                                                    \
163
    {                                                                   \
164
      fprintf ((FILE), "%s", COMMON_ASM_OP);                            \
165
      assemble_name ((FILE), (NAME));                                   \
166
      fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
167
               (SIZE), (ALIGN) / BITS_PER_UNIT);                        \
168
    }                                                                   \
169
  while (0)
170
 
171
/* This says how to output assembler code to declare an
172
   uninitialized internal linkage data object.  Under SVR4,
173
   the linker seems to want the alignment of data objects
174
   to depend on their types.  We do exactly that here.  */
175
 
176
#define LOCAL_ASM_OP    "\t.local\t"
177
 
178
#undef  ASM_OUTPUT_ALIGNED_LOCAL
179
#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN)       \
180
  do                                                            \
181
    {                                                           \
182
      fprintf ((FILE), "%s", LOCAL_ASM_OP);                     \
183
      assemble_name ((FILE), (NAME));                           \
184
      fprintf ((FILE), "\n");                                   \
185
      ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN);      \
186
    }                                                           \
187
  while (0)
188
 
189
/* This is the pseudo-op used to generate a contiguous sequence of byte
190
   values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
191
   AUTOMATICALLY APPENDED.  This is the same for most svr4 assemblers.  */
192
 
193
#undef  ASCII_DATA_ASM_OP
194
#define ASCII_DATA_ASM_OP       "\t.ascii\t"
195
 
196
/* Support a read-only data section.  */
197
#define READONLY_DATA_SECTION_ASM_OP    "\t.section\t.rodata"
198
 
199
/* On svr4, we *do* have support for the .init and .fini sections, and we
200
   can put stuff in there to be executed before and after `main'.  We let
201
   crtstuff.c and other files know this by defining the following symbols.
202
   The definitions say how to change sections to the .init and .fini
203
   sections.  This is the same for all known svr4 assemblers.  */
204
 
205
#define INIT_SECTION_ASM_OP     "\t.section\t.init"
206
#define FINI_SECTION_ASM_OP     "\t.section\t.fini"
207
 
208
/* Output assembly directive to move to the beginning of current section.  */
209
#ifdef HAVE_GAS_SUBSECTION_ORDERING
210
# define ASM_SECTION_START_OP   "\t.subsection\t-1"
211
# define ASM_OUTPUT_SECTION_START(FILE) \
212
  fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
213
#endif
214
 
215
#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
216
 
217
/* Switch into a generic section.  */
218
#define TARGET_ASM_NAMED_SECTION  default_elf_asm_named_section
219
 
220
#undef  TARGET_ASM_SELECT_RTX_SECTION
221
#define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
222
#undef  TARGET_ASM_SELECT_SECTION
223
#define TARGET_ASM_SELECT_SECTION default_elf_select_section
224
 
225
/* Define the strings used for the special svr4 .type and .size directives.
226
   These strings generally do not vary from one system running svr4 to
227
   another, but if a given system (e.g. m88k running svr) needs to use
228
   different pseudo-op names for these, they may be overridden in the
229
   file which includes this one.  */
230
 
231
#define TYPE_ASM_OP     "\t.type\t"
232
#define SIZE_ASM_OP     "\t.size\t"
233
 
234
/* This is how we tell the assembler that a symbol is weak.  */
235
 
236
#define ASM_WEAKEN_LABEL(FILE, NAME)    \
237
  do                                    \
238
    {                                   \
239
      fputs ("\t.weak\t", (FILE));      \
240
      assemble_name ((FILE), (NAME));   \
241
      fputc ('\n', (FILE));             \
242
    }                                   \
243
  while (0)
244
 
245
/* The following macro defines the format used to output the second
246
   operand of the .type assembler directive.  Different svr4 assemblers
247
   expect various different forms for this operand.  The one given here
248
   is just a default.  You may need to override it in your machine-
249
   specific tm.h file (depending upon the particulars of your assembler).  */
250
 
251
#define TYPE_OPERAND_FMT        "@%s"
252
 
253
/* Write the extra assembler code needed to declare a function's result.
254
   Most svr4 assemblers don't require any special declaration of the
255
   result value, but there are exceptions.  */
256
 
257
#ifndef ASM_DECLARE_RESULT
258
#define ASM_DECLARE_RESULT(FILE, RESULT)
259
#endif
260
 
261
/* These macros generate the special .type and .size directives which
262
   are used to set the corresponding fields of the linker symbol table
263
   entries in an ELF object file under SVR4.  These macros also output
264
   the starting labels for the relevant functions/objects.  */
265
 
266
/* Write the extra assembler code needed to declare a function properly.
267
   Some svr4 assemblers need to also have something extra said about the
268
   function's return value.  We allow for that here.  */
269
 
270
#ifndef ASM_DECLARE_FUNCTION_NAME
271
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)             \
272
  do                                                            \
273
    {                                                           \
274
      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function");       \
275
      ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL));            \
276
      ASM_OUTPUT_LABEL (FILE, NAME);                            \
277
    }                                                           \
278
  while (0)
279
#endif
280
 
281
/* Write the extra assembler code needed to declare an object properly.  */
282
 
283
#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL)               \
284
  do                                                            \
285
    {                                                           \
286
      HOST_WIDE_INT size;                                       \
287
                                                                \
288
      ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object");         \
289
                                                                \
290
      size_directive_output = 0;                         \
291
      if (!flag_inhibit_size_directive                          \
292
          && (DECL) && DECL_SIZE (DECL))                        \
293
        {                                                       \
294
          size_directive_output = 1;                            \
295
          size = int_size_in_bytes (TREE_TYPE (DECL));          \
296
          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size);         \
297
        }                                                       \
298
                                                                \
299
      ASM_OUTPUT_LABEL (FILE, NAME);                            \
300
    }                                                           \
301
  while (0)
302
 
303
/* Output the size directive for a decl in rest_of_decl_compilation
304
   in the case where we did not do so before the initializer.
305
   Once we find the error_mark_node, we know that the value of
306
   size_directive_output was set
307
   by ASM_DECLARE_OBJECT_NAME when it was run for the same decl.  */
308
 
309
#undef ASM_FINISH_DECLARE_OBJECT
310
#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
311
  do                                                            \
312
    {                                                           \
313
      const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0);     \
314
      HOST_WIDE_INT size;                                       \
315
                                                                \
316
      if (!flag_inhibit_size_directive                          \
317
          && DECL_SIZE (DECL)                                   \
318
          && ! AT_END && TOP_LEVEL                              \
319
          && DECL_INITIAL (DECL) == error_mark_node             \
320
          && !size_directive_output)                            \
321
        {                                                       \
322
          size_directive_output = 1;                            \
323
          size = int_size_in_bytes (TREE_TYPE (DECL));          \
324
          ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size);         \
325
        }                                                       \
326
    }                                                           \
327
  while (0)
328
 
329
/* This is how to declare the size of a function.  */
330
#ifndef ASM_DECLARE_FUNCTION_SIZE
331
#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)            \
332
  do                                                            \
333
    {                                                           \
334
      if (!flag_inhibit_size_directive)                         \
335
        ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME);                 \
336
    }                                                           \
337
  while (0)
338
#endif
339
 
340
/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
341
   ASM_OUTPUT_LIMITED_STRING macros.  Each byte in the table
342
   corresponds to a particular byte value [0..255].  For any
343
   given byte value, if the value in the corresponding table
344
   position is zero, the given character can be output directly.
345
   If the table value is 1, the byte must be output as a \ooo
346
   octal escape.  If the tables value is anything else, then the
347
   byte value should be output as a \ followed by the value
348
   in the table.  Note that we can use standard UN*X escape
349
   sequences for many control characters, but we don't use
350
   \a to represent BEL because some svr4 assemblers (e.g. on
351
   the i386) don't know about that.  Also, we don't use \v
352
   since some versions of gas, such as 2.2 did not accept it.  */
353
 
354
#define ESCAPES \
355
"\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\
356
\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\
357
\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\
358
\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\
359
\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\
360
\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\
361
\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\
362
\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"
363
 
364
/* Some svr4 assemblers have a limit on the number of characters which
365
   can appear in the operand of a .string directive.  If your assembler
366
   has such a limitation, you should define STRING_LIMIT to reflect that
367
   limit.  Note that at least some svr4 assemblers have a limit on the
368
   actual number of bytes in the double-quoted string, and that they
369
   count each character in an escape sequence as one byte.  Thus, an
370
   escape sequence like \377 would count as four bytes.
371
 
372
   If your target assembler doesn't support the .string directive, you
373
   should define this to zero.
374
*/
375
 
376
#define STRING_LIMIT    ((unsigned) 256)
377
 
378
#define STRING_ASM_OP   "\t.string\t"
379
 
380
/* The routine used to output NUL terminated strings.  We use a special
381
   version of this for most svr4 targets because doing so makes the
382
   generated assembly code more compact (and thus faster to assemble)
383
   as well as more readable, especially for targets like the i386
384
   (where the only alternative is to output character sequences as
385
   comma separated lists of numbers).  */
386
 
387
#define ASM_OUTPUT_LIMITED_STRING(FILE, STR)            \
388
  do                                                    \
389
    {                                                   \
390
      register const unsigned char *_limited_str =      \
391
        (const unsigned char *) (STR);                  \
392
      register unsigned ch;                             \
393
                                                        \
394
      fprintf ((FILE), "%s\"", STRING_ASM_OP);          \
395
                                                        \
396
      for (; (ch = *_limited_str); _limited_str++)      \
397
        {                                               \
398
          register int escape;                          \
399
                                                        \
400
          switch (escape = ESCAPES[ch])                 \
401
            {                                           \
402
            case 0:                                      \
403
              putc (ch, (FILE));                        \
404
              break;                                    \
405
            case 1:                                     \
406
              fprintf ((FILE), "\\%03o", ch);           \
407
              break;                                    \
408
            default:                                    \
409
              putc ('\\', (FILE));                      \
410
              putc (escape, (FILE));                    \
411
              break;                                    \
412
            }                                           \
413
        }                                               \
414
                                                        \
415
      fprintf ((FILE), "\"\n");                         \
416
    }                                                   \
417
  while (0)
418
 
419
/* The routine used to output sequences of byte values.  We use a special
420
   version of this for most svr4 targets because doing so makes the
421
   generated assembly code more compact (and thus faster to assemble)
422
   as well as more readable.  Note that if we find subparts of the
423
   character sequence which end with NUL (and which are shorter than
424
   STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING.  */
425
 
426
#undef  ASM_OUTPUT_ASCII
427
#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH)                             \
428
  do                                                                    \
429
    {                                                                   \
430
      register const unsigned char *_ascii_bytes =                      \
431
        (const unsigned char *) (STR);                                  \
432
      register const unsigned char *limit = _ascii_bytes + (LENGTH);    \
433
      register unsigned bytes_in_chunk = 0;                              \
434
                                                                        \
435
      for (; _ascii_bytes < limit; _ascii_bytes++)                      \
436
        {                                                               \
437
          register const unsigned char *p;                              \
438
                                                                        \
439
          if (bytes_in_chunk >= 60)                                     \
440
            {                                                           \
441
              fprintf ((FILE), "\"\n");                                 \
442
              bytes_in_chunk = 0;                                        \
443
            }                                                           \
444
                                                                        \
445
          for (p = _ascii_bytes; p < limit && *p != '\0'; p++)          \
446
            continue;                                                   \
447
                                                                        \
448
          if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT)    \
449
            {                                                           \
450
              if (bytes_in_chunk > 0)                                    \
451
                {                                                       \
452
                  fprintf ((FILE), "\"\n");                             \
453
                  bytes_in_chunk = 0;                                    \
454
                }                                                       \
455
                                                                        \
456
              ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes);         \
457
              _ascii_bytes = p;                                         \
458
            }                                                           \
459
          else                                                          \
460
            {                                                           \
461
              register int escape;                                      \
462
              register unsigned ch;                                     \
463
                                                                        \
464
              if (bytes_in_chunk == 0)                                   \
465
                fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP);            \
466
                                                                        \
467
              switch (escape = ESCAPES[ch = *_ascii_bytes])             \
468
                {                                                       \
469
                case 0:                                                  \
470
                  putc (ch, (FILE));                                    \
471
                  bytes_in_chunk++;                                     \
472
                  break;                                                \
473
                case 1:                                                 \
474
                  fprintf ((FILE), "\\%03o", ch);                       \
475
                  bytes_in_chunk += 4;                                  \
476
                  break;                                                \
477
                default:                                                \
478
                  putc ('\\', (FILE));                                  \
479
                  putc (escape, (FILE));                                \
480
                  bytes_in_chunk += 2;                                  \
481
                  break;                                                \
482
                }                                                       \
483
            }                                                           \
484
        }                                                               \
485
                                                                        \
486
      if (bytes_in_chunk > 0)                                            \
487
        fprintf ((FILE), "\"\n");                                       \
488
    }                                                                   \
489
  while (0)

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