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comparison gcc/config/elfos.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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children 77e2b8dfacca
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1 /* 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 2007, 2009 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 3, 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 Under Section 7 of GPL version 3, you are granted additional
20 permissions described in the GCC Runtime Library Exception, version
21 3.1, as published by the Free Software Foundation.
22
23 You should have received a copy of the GNU General Public License and
24 a copy of the GCC Runtime Library Exception along with this program;
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 <http://www.gnu.org/licenses/>. */
27
28 #define TARGET_OBJFMT_CPP_BUILTINS() \
29 do \
30 { \
31 builtin_define ("__ELF__"); \
32 } \
33 while (0)
34
35 /* Define a symbol indicating that we are using elfos.h.
36 Some CPU specific configuration files use this. */
37 #define USING_ELFOS_H
38
39 /* The prefix to add to user-visible assembler symbols.
40
41 For ELF systems the convention is *not* to prepend a leading
42 underscore onto user-level symbol names. */
43
44 #undef USER_LABEL_PREFIX
45 #define USER_LABEL_PREFIX ""
46
47 /* The biggest alignment supported by ELF in bits. 32-bit ELF
48 supports section alignment up to (0x80000000 * 8), while
49 64-bit ELF supports (0x8000000000000000 * 8). If this macro
50 is not defined, the default is the largest alignment supported
51 by 32-bit ELF and representable on a 32-bit host. Use this
52 macro to limit the alignment which can be specified using
53 the `__attribute__ ((aligned (N)))' construct. */
54 #ifndef MAX_OFILE_ALIGNMENT
55 #define MAX_OFILE_ALIGNMENT (((unsigned int) 1 << 28) * 8)
56 #endif
57
58 /* Use periods rather than dollar signs in special g++ assembler names. */
59
60 #define NO_DOLLAR_IN_LABEL
61
62 /* Writing `int' for a bit-field forces int alignment for the structure. */
63
64 #ifndef PCC_BITFIELD_TYPE_MATTERS
65 #define PCC_BITFIELD_TYPE_MATTERS 1
66 #endif
67
68 /* Handle #pragma weak and #pragma pack. */
69
70 #define HANDLE_SYSV_PRAGMA 1
71
72 /* All ELF targets can support DWARF-2. */
73
74 #define DWARF2_DEBUGGING_INFO 1
75
76 /* The GNU tools operate better with dwarf2, and it is required by some
77 psABI's. Since we don't have any native tools to be compatible with,
78 default to dwarf2. */
79
80 #ifndef PREFERRED_DEBUGGING_TYPE
81 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
82 #endif
83
84 /* All SVR4 targets use the ELF object file format. */
85 #define OBJECT_FORMAT_ELF
86
87
88 /* Output #ident as a .ident. */
89
90 #define ASM_OUTPUT_IDENT(FILE, NAME) \
91 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
92
93 #define IDENT_ASM_OP "\t.ident\t"
94
95 #undef SET_ASM_OP
96 #define SET_ASM_OP "\t.set\t"
97
98 /* Most svr4 assemblers want a .file directive at the beginning of
99 their input file. */
100 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
101
102 /* This is how to allocate empty space in some section. The .zero
103 pseudo-op is used for this on most svr4 assemblers. */
104
105 #define SKIP_ASM_OP "\t.zero\t"
106
107 #undef ASM_OUTPUT_SKIP
108 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
109 fprintf ((FILE), "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n",\
110 SKIP_ASM_OP, (SIZE))
111
112 /* This is how to store into the string LABEL
113 the symbol_ref name of an internal numbered label where
114 PREFIX is the class of label and NUM is the number within the class.
115 This is suitable for output with `assemble_name'.
116
117 For most svr4 systems, the convention is that any symbol which begins
118 with a period is not put into the linker symbol table by the assembler. */
119
120 #undef ASM_GENERATE_INTERNAL_LABEL
121 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
122 do \
123 { \
124 sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM)); \
125 } \
126 while (0)
127
128 /* Output the label which precedes a jumptable. Note that for all svr4
129 systems where we actually generate jumptables (which is to say every
130 svr4 target except i386, where we use casesi instead) we put the jump-
131 tables into the .rodata section and since other stuff could have been
132 put into the .rodata section prior to any given jumptable, we have to
133 make sure that the location counter for the .rodata section gets pro-
134 perly re-aligned prior to the actual beginning of the jump table. */
135
136 #undef ALIGN_ASM_OP
137 #define ALIGN_ASM_OP "\t.align\t"
138
139 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
140 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
141 ASM_OUTPUT_ALIGN ((FILE), 2);
142 #endif
143
144 #undef ASM_OUTPUT_CASE_LABEL
145 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
146 do \
147 { \
148 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
149 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \
150 } \
151 while (0)
152
153 /* The standard SVR4 assembler seems to require that certain builtin
154 library routines (e.g. .udiv) be explicitly declared as .globl
155 in each assembly file where they are referenced. */
156
157 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
158 (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0))
159
160 /* This says how to output assembler code to declare an
161 uninitialized external linkage data object. Under SVR4,
162 the linker seems to want the alignment of data objects
163 to depend on their types. We do exactly that here. */
164
165 #define COMMON_ASM_OP "\t.comm\t"
166
167 #undef ASM_OUTPUT_ALIGNED_COMMON
168 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
169 do \
170 { \
171 fprintf ((FILE), "%s", COMMON_ASM_OP); \
172 assemble_name ((FILE), (NAME)); \
173 fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n", \
174 (SIZE), (ALIGN) / BITS_PER_UNIT); \
175 } \
176 while (0)
177
178 /* This says how to output assembler code to declare an
179 uninitialized internal linkage data object. Under SVR4,
180 the linker seems to want the alignment of data objects
181 to depend on their types. We do exactly that here. */
182
183 #define LOCAL_ASM_OP "\t.local\t"
184
185 #undef ASM_OUTPUT_ALIGNED_LOCAL
186 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
187 do \
188 { \
189 fprintf ((FILE), "%s", LOCAL_ASM_OP); \
190 assemble_name ((FILE), (NAME)); \
191 fprintf ((FILE), "\n"); \
192 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
193 } \
194 while (0)
195
196 /* This is the pseudo-op used to generate a contiguous sequence of byte
197 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
198 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
199
200 #undef ASCII_DATA_ASM_OP
201 #define ASCII_DATA_ASM_OP "\t.ascii\t"
202
203 /* Support a read-only data section. */
204 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata"
205
206 /* On svr4, we *do* have support for the .init and .fini sections, and we
207 can put stuff in there to be executed before and after `main'. We let
208 crtstuff.c and other files know this by defining the following symbols.
209 The definitions say how to change sections to the .init and .fini
210 sections. This is the same for all known svr4 assemblers. */
211
212 #define INIT_SECTION_ASM_OP "\t.section\t.init"
213 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
214
215 /* Output assembly directive to move to the beginning of current section. */
216 #ifdef HAVE_GAS_SUBSECTION_ORDERING
217 # define ASM_SECTION_START_OP "\t.subsection\t-1"
218 # define ASM_OUTPUT_SECTION_START(FILE) \
219 fprintf ((FILE), "%s\n", ASM_SECTION_START_OP)
220 #endif
221
222 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
223
224 /* Switch into a generic section. */
225 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section
226
227 #undef TARGET_ASM_SELECT_RTX_SECTION
228 #define TARGET_ASM_SELECT_RTX_SECTION default_elf_select_rtx_section
229 #undef TARGET_ASM_SELECT_SECTION
230 #define TARGET_ASM_SELECT_SECTION default_elf_select_section
231 #undef TARGET_HAVE_SWITCHABLE_BSS_SECTIONS
232 #define TARGET_HAVE_SWITCHABLE_BSS_SECTIONS true
233
234 /* Define the strings used for the special svr4 .type and .size directives.
235 These strings generally do not vary from one system running svr4 to
236 another, but if a given system (e.g. m88k running svr) needs to use
237 different pseudo-op names for these, they may be overridden in the
238 file which includes this one. */
239
240 #define TYPE_ASM_OP "\t.type\t"
241 #define SIZE_ASM_OP "\t.size\t"
242
243 /* This is how we tell the assembler that a symbol is weak. */
244
245 #define ASM_WEAKEN_LABEL(FILE, NAME) \
246 do \
247 { \
248 fputs ("\t.weak\t", (FILE)); \
249 assemble_name ((FILE), (NAME)); \
250 fputc ('\n', (FILE)); \
251 } \
252 while (0)
253
254 /* The following macro defines the format used to output the second
255 operand of the .type assembler directive. Different svr4 assemblers
256 expect various different forms for this operand. The one given here
257 is just a default. You may need to override it in your machine-
258 specific tm.h file (depending upon the particulars of your assembler). */
259
260 #define TYPE_OPERAND_FMT "@%s"
261
262 /* Write the extra assembler code needed to declare a function's result.
263 Most svr4 assemblers don't require any special declaration of the
264 result value, but there are exceptions. */
265
266 #ifndef ASM_DECLARE_RESULT
267 #define ASM_DECLARE_RESULT(FILE, RESULT)
268 #endif
269
270 /* These macros generate the special .type and .size directives which
271 are used to set the corresponding fields of the linker symbol table
272 entries in an ELF object file under SVR4. These macros also output
273 the starting labels for the relevant functions/objects. */
274
275 /* Write the extra assembler code needed to declare a function properly.
276 Some svr4 assemblers need to also have something extra said about the
277 function's return value. We allow for that here. */
278
279 #ifndef ASM_DECLARE_FUNCTION_NAME
280 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
281 do \
282 { \
283 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
284 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
285 ASM_OUTPUT_LABEL (FILE, NAME); \
286 } \
287 while (0)
288 #endif
289
290 /* Write the extra assembler code needed to declare an object properly. */
291
292 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
293 do \
294 { \
295 HOST_WIDE_INT size; \
296 \
297 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
298 \
299 size_directive_output = 0; \
300 if (!flag_inhibit_size_directive \
301 && (DECL) && DECL_SIZE (DECL)) \
302 { \
303 size_directive_output = 1; \
304 size = int_size_in_bytes (TREE_TYPE (DECL)); \
305 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
306 } \
307 \
308 ASM_OUTPUT_LABEL (FILE, NAME); \
309 } \
310 while (0)
311
312 /* Output the size directive for a decl in rest_of_decl_compilation
313 in the case where we did not do so before the initializer.
314 Once we find the error_mark_node, we know that the value of
315 size_directive_output was set
316 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
317
318 #undef ASM_FINISH_DECLARE_OBJECT
319 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
320 do \
321 { \
322 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
323 HOST_WIDE_INT size; \
324 \
325 if (!flag_inhibit_size_directive \
326 && DECL_SIZE (DECL) \
327 && ! AT_END && TOP_LEVEL \
328 && DECL_INITIAL (DECL) == error_mark_node \
329 && !size_directive_output) \
330 { \
331 size_directive_output = 1; \
332 size = int_size_in_bytes (TREE_TYPE (DECL)); \
333 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
334 } \
335 } \
336 while (0)
337
338 /* This is how to declare the size of a function. */
339 #ifndef ASM_DECLARE_FUNCTION_SIZE
340 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
341 do \
342 { \
343 if (!flag_inhibit_size_directive) \
344 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
345 } \
346 while (0)
347 #endif
348
349 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
350 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
351 corresponds to a particular byte value [0..255]. For any
352 given byte value, if the value in the corresponding table
353 position is zero, the given character can be output directly.
354 If the table value is 1, the byte must be output as a \ooo
355 octal escape. If the tables value is anything else, then the
356 byte value should be output as a \ followed by the value
357 in the table. Note that we can use standard UN*X escape
358 sequences for many control characters, but we don't use
359 \a to represent BEL because some svr4 assemblers (e.g. on
360 the i386) don't know about that. Also, we don't use \v
361 since some versions of gas, such as 2.2 did not accept it. */
362
363 #define ESCAPES \
364 "\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\
365 \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\
366 \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\
367 \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\
368 \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\
369 \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\
370 \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\
371 \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"
372
373 /* Some svr4 assemblers have a limit on the number of characters which
374 can appear in the operand of a .string directive. If your assembler
375 has such a limitation, you should define STRING_LIMIT to reflect that
376 limit. Note that at least some svr4 assemblers have a limit on the
377 actual number of bytes in the double-quoted string, and that they
378 count each character in an escape sequence as one byte. Thus, an
379 escape sequence like \377 would count as four bytes.
380
381 If your target assembler doesn't support the .string directive, you
382 should define this to zero.
383 */
384
385 #define STRING_LIMIT ((unsigned) 256)
386
387 #define STRING_ASM_OP "\t.string\t"
388
389 /* The routine used to output NUL terminated strings. We use a special
390 version of this for most svr4 targets because doing so makes the
391 generated assembly code more compact (and thus faster to assemble)
392 as well as more readable, especially for targets like the i386
393 (where the only alternative is to output character sequences as
394 comma separated lists of numbers). */
395
396 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
397 do \
398 { \
399 register const unsigned char *_limited_str = \
400 (const unsigned char *) (STR); \
401 register unsigned ch; \
402 \
403 fprintf ((FILE), "%s\"", STRING_ASM_OP); \
404 \
405 for (; (ch = *_limited_str); _limited_str++) \
406 { \
407 register int escape; \
408 \
409 switch (escape = ESCAPES[ch]) \
410 { \
411 case 0: \
412 putc (ch, (FILE)); \
413 break; \
414 case 1: \
415 fprintf ((FILE), "\\%03o", ch); \
416 break; \
417 default: \
418 putc ('\\', (FILE)); \
419 putc (escape, (FILE)); \
420 break; \
421 } \
422 } \
423 \
424 fprintf ((FILE), "\"\n"); \
425 } \
426 while (0)
427
428 /* The routine used to output sequences of byte values. We use a special
429 version of this for most svr4 targets because doing so makes the
430 generated assembly code more compact (and thus faster to assemble)
431 as well as more readable. Note that if we find subparts of the
432 character sequence which end with NUL (and which are shorter than
433 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
434
435 #undef ASM_OUTPUT_ASCII
436 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
437 do \
438 { \
439 const unsigned char *_ascii_bytes = \
440 (const unsigned char *) (STR); \
441 const unsigned char *limit = _ascii_bytes + (LENGTH); \
442 const unsigned char *last_null = NULL; \
443 unsigned bytes_in_chunk = 0; \
444 \
445 for (; _ascii_bytes < limit; _ascii_bytes++) \
446 { \
447 const unsigned char *p; \
448 \
449 if (bytes_in_chunk >= 60) \
450 { \
451 fprintf ((FILE), "\"\n"); \
452 bytes_in_chunk = 0; \
453 } \
454 \
455 if (_ascii_bytes > last_null) \
456 { \
457 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
458 continue; \
459 last_null = p; \
460 } \
461 else \
462 p = last_null; \
463 \
464 if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \
465 { \
466 if (bytes_in_chunk > 0) \
467 { \
468 fprintf ((FILE), "\"\n"); \
469 bytes_in_chunk = 0; \
470 } \
471 \
472 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
473 _ascii_bytes = p; \
474 } \
475 else \
476 { \
477 register int escape; \
478 register unsigned ch; \
479 \
480 if (bytes_in_chunk == 0) \
481 fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP); \
482 \
483 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
484 { \
485 case 0: \
486 putc (ch, (FILE)); \
487 bytes_in_chunk++; \
488 break; \
489 case 1: \
490 fprintf ((FILE), "\\%03o", ch); \
491 bytes_in_chunk += 4; \
492 break; \
493 default: \
494 putc ('\\', (FILE)); \
495 putc (escape, (FILE)); \
496 bytes_in_chunk += 2; \
497 break; \
498 } \
499 } \
500 } \
501 \
502 if (bytes_in_chunk > 0) \
503 fprintf ((FILE), "\"\n"); \
504 } \
505 while (0)
506
507 /* Allow the use of the -frecord-gcc-switches switch via the
508 elf_record_gcc_switches function defined in varasm.c. */
509 #undef TARGET_ASM_RECORD_GCC_SWITCHES
510 #define TARGET_ASM_RECORD_GCC_SWITCHES elf_record_gcc_switches
511
512 /* A C statement (sans semicolon) to output to the stdio stream STREAM
513 any text necessary for declaring the name of an external symbol
514 named NAME which is referenced in this compilation but not defined.
515 It is needed to properly support non-default visibility. */
516
517 #ifndef ASM_OUTPUT_EXTERNAL
518 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
519 default_elf_asm_output_external (FILE, DECL, NAME)
520 #endif