Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/alpha/elf.h @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 77e2b8dfacca |
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1 /* Definitions of target machine for GNU compiler, for DEC Alpha w/ELF. | |
2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008 | |
3 Free Software Foundation, Inc. | |
4 Contributed by Richard Henderson (rth@tamu.edu). | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify | |
9 it under the terms of the GNU General Public License as published by | |
10 the Free Software Foundation; either version 3, or (at your option) | |
11 any later version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, | |
14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 GNU General Public License for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #undef OBJECT_FORMAT_COFF | |
23 #undef EXTENDED_COFF | |
24 #define OBJECT_FORMAT_ELF | |
25 | |
26 /* ??? Move all SDB stuff from alpha.h to osf.h. */ | |
27 #undef SDB_DEBUGGING_INFO | |
28 | |
29 #define DBX_DEBUGGING_INFO 1 | |
30 #define DWARF2_DEBUGGING_INFO 1 | |
31 | |
32 #undef PREFERRED_DEBUGGING_TYPE | |
33 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG | |
34 | |
35 #undef ASM_FINAL_SPEC | |
36 | |
37 /* alpha/ doesn't use elfos.h for some reason. */ | |
38 #define TARGET_OBJFMT_CPP_BUILTINS() \ | |
39 do \ | |
40 { \ | |
41 builtin_define ("__ELF__"); \ | |
42 } \ | |
43 while (0) | |
44 | |
45 #undef CC1_SPEC | |
46 #define CC1_SPEC "%{G*}" | |
47 | |
48 #undef ASM_SPEC | |
49 #define ASM_SPEC "%{G*} %{relax:-relax} %{!gstabs*:-no-mdebug}%{gstabs*:-mdebug}" | |
50 | |
51 #undef IDENT_ASM_OP | |
52 #define IDENT_ASM_OP "\t.ident\t" | |
53 | |
54 /* Output #ident as a .ident. */ | |
55 #undef ASM_OUTPUT_IDENT | |
56 #define ASM_OUTPUT_IDENT(FILE, NAME) \ | |
57 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME); | |
58 | |
59 /* This is how to allocate empty space in some section. The .zero | |
60 pseudo-op is used for this on most svr4 assemblers. */ | |
61 | |
62 #undef SKIP_ASM_OP | |
63 #define SKIP_ASM_OP "\t.zero\t" | |
64 | |
65 #undef ASM_OUTPUT_SKIP | |
66 #define ASM_OUTPUT_SKIP(FILE, SIZE) \ | |
67 fprintf (FILE, "%s"HOST_WIDE_INT_PRINT_UNSIGNED"\n", SKIP_ASM_OP, (SIZE)) | |
68 | |
69 /* Output the label which precedes a jumptable. Note that for all svr4 | |
70 systems where we actually generate jumptables (which is to say every | |
71 svr4 target except i386, where we use casesi instead) we put the jump- | |
72 tables into the .rodata section and since other stuff could have been | |
73 put into the .rodata section prior to any given jumptable, we have to | |
74 make sure that the location counter for the .rodata section gets pro- | |
75 perly re-aligned prior to the actual beginning of the jump table. */ | |
76 | |
77 #undef ALIGN_ASM_OP | |
78 #define ALIGN_ASM_OP "\t.align\t" | |
79 | |
80 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL | |
81 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \ | |
82 ASM_OUTPUT_ALIGN ((FILE), 2); | |
83 #endif | |
84 | |
85 #undef ASM_OUTPUT_CASE_LABEL | |
86 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \ | |
87 do { \ | |
88 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \ | |
89 (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM); \ | |
90 } while (0) | |
91 | |
92 /* The standard SVR4 assembler seems to require that certain builtin | |
93 library routines (e.g. .udiv) be explicitly declared as .globl | |
94 in each assembly file where they are referenced. */ | |
95 | |
96 #undef ASM_OUTPUT_EXTERNAL_LIBCALL | |
97 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \ | |
98 (*targetm.asm_out.globalize_label) (FILE, XSTR (FUN, 0)) | |
99 | |
100 /* This says how to output assembler code to declare an | |
101 uninitialized external linkage data object. Under SVR4, | |
102 the linker seems to want the alignment of data objects | |
103 to depend on their types. We do exactly that here. */ | |
104 | |
105 #undef COMMON_ASM_OP | |
106 #define COMMON_ASM_OP "\t.comm\t" | |
107 | |
108 #undef ASM_OUTPUT_ALIGNED_COMMON | |
109 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \ | |
110 do { \ | |
111 fprintf ((FILE), "%s", COMMON_ASM_OP); \ | |
112 assemble_name ((FILE), (NAME)); \ | |
113 fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \ | |
114 } while (0) | |
115 | |
116 /* This says how to output assembler code to declare an | |
117 uninitialized internal linkage data object. Under SVR4, | |
118 the linker seems to want the alignment of data objects | |
119 to depend on their types. We do exactly that here. */ | |
120 | |
121 #undef ASM_OUTPUT_ALIGNED_LOCAL | |
122 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \ | |
123 do { \ | |
124 if ((SIZE) <= g_switch_value) \ | |
125 switch_to_section (sbss_section); \ | |
126 else \ | |
127 switch_to_section (bss_section); \ | |
128 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ | |
129 if (!flag_inhibit_size_directive) \ | |
130 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, SIZE); \ | |
131 ASM_OUTPUT_ALIGN ((FILE), exact_log2((ALIGN) / BITS_PER_UNIT)); \ | |
132 ASM_OUTPUT_LABEL(FILE, NAME); \ | |
133 ASM_OUTPUT_SKIP((FILE), (SIZE) ? (SIZE) : 1); \ | |
134 } while (0) | |
135 | |
136 /* This says how to output assembler code to declare an | |
137 uninitialized external linkage data object. */ | |
138 | |
139 #undef ASM_OUTPUT_ALIGNED_BSS | |
140 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ | |
141 do { \ | |
142 ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \ | |
143 } while (0) | |
144 | |
145 /* Biggest alignment supported by the object file format of this | |
146 machine. Use this macro to limit the alignment which can be | |
147 specified using the `__attribute__ ((aligned (N)))' construct. If | |
148 not defined, the default value is `BIGGEST_ALIGNMENT'. | |
149 | |
150 This value is really 2^63. Since gcc figures the alignment in bits, | |
151 we could only potentially get to 2^60 on suitable hosts. Due to other | |
152 considerations in varasm, we must restrict this to what fits in an int. */ | |
153 | |
154 #undef MAX_OFILE_ALIGNMENT | |
155 #define MAX_OFILE_ALIGNMENT \ | |
156 (1 << (HOST_BITS_PER_INT < 64 ? HOST_BITS_PER_INT - 2 : 62)) | |
157 | |
158 /* This is the pseudo-op used to generate a contiguous sequence of byte | |
159 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL | |
160 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */ | |
161 | |
162 #undef ASCII_DATA_ASM_OP | |
163 #define ASCII_DATA_ASM_OP "\t.ascii\t" | |
164 | |
165 #undef READONLY_DATA_SECTION_ASM_OP | |
166 #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata" | |
167 #undef BSS_SECTION_ASM_OP | |
168 #define BSS_SECTION_ASM_OP "\t.section\t.bss" | |
169 #undef SBSS_SECTION_ASM_OP | |
170 #define SBSS_SECTION_ASM_OP "\t.section\t.sbss,\"aw\"" | |
171 #undef SDATA_SECTION_ASM_OP | |
172 #define SDATA_SECTION_ASM_OP "\t.section\t.sdata,\"aw\"" | |
173 | |
174 /* On svr4, we *do* have support for the .init and .fini sections, and we | |
175 can put stuff in there to be executed before and after `main'. We let | |
176 crtstuff.c and other files know this by defining the following symbols. | |
177 The definitions say how to change sections to the .init and .fini | |
178 sections. This is the same for all known svr4 assemblers. */ | |
179 | |
180 #undef INIT_SECTION_ASM_OP | |
181 #define INIT_SECTION_ASM_OP "\t.section\t.init" | |
182 #undef FINI_SECTION_ASM_OP | |
183 #define FINI_SECTION_ASM_OP "\t.section\t.fini" | |
184 | |
185 #ifdef HAVE_GAS_SUBSECTION_ORDERING | |
186 | |
187 #define ASM_SECTION_START_OP "\t.subsection\t-1" | |
188 | |
189 /* Output assembly directive to move to the beginning of current section. */ | |
190 #define ASM_OUTPUT_SECTION_START(FILE) \ | |
191 fprintf ((FILE), "%s\n", ASM_SECTION_START_OP) | |
192 | |
193 #endif | |
194 | |
195 /* Switch into a generic section. */ | |
196 #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section | |
197 #define TARGET_ASM_SELECT_SECTION default_elf_select_section | |
198 | |
199 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1) | |
200 | |
201 /* Define the strings used for the special svr4 .type and .size directives. | |
202 These strings generally do not vary from one system running svr4 to | |
203 another, but if a given system (e.g. m88k running svr) needs to use | |
204 different pseudo-op names for these, they may be overridden in the | |
205 file which includes this one. */ | |
206 | |
207 #undef TYPE_ASM_OP | |
208 #define TYPE_ASM_OP "\t.type\t" | |
209 #undef SIZE_ASM_OP | |
210 #define SIZE_ASM_OP "\t.size\t" | |
211 | |
212 /* This is how we tell the assembler that a symbol is weak. */ | |
213 | |
214 #undef ASM_WEAKEN_LABEL | |
215 #define ASM_WEAKEN_LABEL(FILE, NAME) \ | |
216 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \ | |
217 fputc ('\n', FILE); } while (0) | |
218 | |
219 /* This is how we tell the assembler that two symbols have the same value. */ | |
220 | |
221 #undef ASM_OUTPUT_DEF | |
222 #define ASM_OUTPUT_DEF(FILE, ALIAS, NAME) \ | |
223 do { \ | |
224 assemble_name(FILE, ALIAS); \ | |
225 fputs(" = ", FILE); \ | |
226 assemble_name(FILE, NAME); \ | |
227 fputc('\n', FILE); \ | |
228 } while (0) | |
229 | |
230 #undef ASM_OUTPUT_DEF_FROM_DECLS | |
231 #define ASM_OUTPUT_DEF_FROM_DECLS(FILE, DECL, TARGET) \ | |
232 do { \ | |
233 const char *alias = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ | |
234 const char *name = IDENTIFIER_POINTER (TARGET); \ | |
235 if (TREE_CODE (DECL) == FUNCTION_DECL) \ | |
236 { \ | |
237 fputc ('$', FILE); \ | |
238 assemble_name (FILE, alias); \ | |
239 fputs ("..ng = $", FILE); \ | |
240 assemble_name (FILE, name); \ | |
241 fputs ("..ng\n", FILE); \ | |
242 } \ | |
243 assemble_name(FILE, alias); \ | |
244 fputs(" = ", FILE); \ | |
245 assemble_name(FILE, name); \ | |
246 fputc('\n', FILE); \ | |
247 } while (0) | |
248 | |
249 /* The following macro defines the format used to output the second | |
250 operand of the .type assembler directive. Different svr4 assemblers | |
251 expect various different forms for this operand. The one given here | |
252 is just a default. You may need to override it in your machine- | |
253 specific tm.h file (depending upon the particulars of your assembler). */ | |
254 | |
255 #undef TYPE_OPERAND_FMT | |
256 #define TYPE_OPERAND_FMT "@%s" | |
257 | |
258 /* Write the extra assembler code needed to declare a function's result. | |
259 Most svr4 assemblers don't require any special declaration of the | |
260 result value, but there are exceptions. */ | |
261 | |
262 #ifndef ASM_DECLARE_RESULT | |
263 #define ASM_DECLARE_RESULT(FILE, RESULT) | |
264 #endif | |
265 | |
266 /* These macros generate the special .type and .size directives which | |
267 are used to set the corresponding fields of the linker symbol table | |
268 entries in an ELF object file under SVR4. These macros also output | |
269 the starting labels for the relevant functions/objects. */ | |
270 | |
271 /* Write the extra assembler code needed to declare an object properly. */ | |
272 | |
273 #undef ASM_DECLARE_OBJECT_NAME | |
274 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \ | |
275 do { \ | |
276 HOST_WIDE_INT size; \ | |
277 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ | |
278 size_directive_output = 0; \ | |
279 if (!flag_inhibit_size_directive \ | |
280 && DECL_SIZE (DECL) \ | |
281 && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \ | |
282 { \ | |
283 size_directive_output = 1; \ | |
284 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \ | |
285 } \ | |
286 ASM_OUTPUT_LABEL(FILE, NAME); \ | |
287 } while (0) | |
288 | |
289 /* Output the size directive for a decl in rest_of_decl_compilation | |
290 in the case where we did not do so before the initializer. | |
291 Once we find the error_mark_node, we know that the value of | |
292 size_directive_output was set | |
293 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */ | |
294 | |
295 #undef ASM_FINISH_DECLARE_OBJECT | |
296 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \ | |
297 do { \ | |
298 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \ | |
299 HOST_WIDE_INT size; \ | |
300 if (!flag_inhibit_size_directive \ | |
301 && DECL_SIZE (DECL) \ | |
302 && ! AT_END && TOP_LEVEL \ | |
303 && DECL_INITIAL (DECL) == error_mark_node \ | |
304 && !size_directive_output \ | |
305 && (size = int_size_in_bytes (TREE_TYPE (DECL))) > 0) \ | |
306 { \ | |
307 size_directive_output = 1; \ | |
308 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \ | |
309 } \ | |
310 } while (0) | |
311 | |
312 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and | |
313 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table | |
314 corresponds to a particular byte value [0..255]. For any | |
315 given byte value, if the value in the corresponding table | |
316 position is zero, the given character can be output directly. | |
317 If the table value is 1, the byte must be output as a \ooo | |
318 octal escape. If the tables value is anything else, then the | |
319 byte value should be output as a \ followed by the value | |
320 in the table. Note that we can use standard UN*X escape | |
321 sequences for many control characters, but we don't use | |
322 \a to represent BEL because some svr4 assemblers (e.g. on | |
323 the i386) don't know about that. Also, we don't use \v | |
324 since some versions of gas, such as 2.2 did not accept it. */ | |
325 | |
326 #undef ESCAPES | |
327 #define ESCAPES \ | |
328 "\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\ | |
329 \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\ | |
330 \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\ | |
331 \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\ | |
332 \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\ | |
333 \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\ | |
334 \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\ | |
335 \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" | |
336 | |
337 /* Some svr4 assemblers have a limit on the number of characters which | |
338 can appear in the operand of a .string directive. If your assembler | |
339 has such a limitation, you should define STRING_LIMIT to reflect that | |
340 limit. Note that at least some svr4 assemblers have a limit on the | |
341 actual number of bytes in the double-quoted string, and that they | |
342 count each character in an escape sequence as one byte. Thus, an | |
343 escape sequence like \377 would count as four bytes. | |
344 | |
345 If your target assembler doesn't support the .string directive, you | |
346 should define this to zero. */ | |
347 | |
348 #undef STRING_LIMIT | |
349 #define STRING_LIMIT ((unsigned) 256) | |
350 #undef STRING_ASM_OP | |
351 #define STRING_ASM_OP "\t.string\t" | |
352 | |
353 /* GAS is the only Alpha/ELF assembler. */ | |
354 #undef TARGET_GAS | |
355 #define TARGET_GAS (1) | |
356 | |
357 /* Provide a STARTFILE_SPEC appropriate for ELF. Here we add the | |
358 (even more) magical crtbegin.o file which provides part of the | |
359 support for getting C++ file-scope static object constructed | |
360 before entering `main'. */ | |
361 | |
362 #undef STARTFILE_SPEC | |
363 #ifdef HAVE_LD_PIE | |
364 #define STARTFILE_SPEC \ | |
365 "%{!shared: %{pg|p:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}}\ | |
366 crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" | |
367 #else | |
368 #define STARTFILE_SPEC \ | |
369 "%{!shared: %{pg|p:gcrt1.o%s;:crt1.o%s}}\ | |
370 crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}" | |
371 #endif | |
372 | |
373 /* Provide a ENDFILE_SPEC appropriate for ELF. Here we tack on the | |
374 magical crtend.o file which provides part of the support for | |
375 getting C++ file-scope static object constructed before entering | |
376 `main', followed by a normal ELF "finalizer" file, `crtn.o'. */ | |
377 | |
378 #undef ENDFILE_SPEC | |
379 #define ENDFILE_SPEC \ | |
380 "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \ | |
381 %{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s" | |
382 | |
383 /* We support #pragma. */ | |
384 #define HANDLE_SYSV_PRAGMA 1 | |
385 | |
386 /* Select a format to encode pointers in exception handling data. CODE | |
387 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is | |
388 true if the symbol may be affected by dynamic relocations. | |
389 | |
390 Since application size is already constrained to <2GB by the form of | |
391 the ldgp relocation, we can use a 32-bit pc-relative relocation to | |
392 static data. Dynamic data is accessed indirectly to allow for read | |
393 only EH sections. */ | |
394 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \ | |
395 (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4) | |
396 | |
397 /* If defined, a C statement to be executed just prior to the output of | |
398 assembler code for INSN. */ | |
399 #define FINAL_PRESCAN_INSN(INSN, OPVEC, NOPERANDS) \ | |
400 (alpha_this_literal_sequence_number = 0, \ | |
401 alpha_this_gpdisp_sequence_number = 0) | |
402 extern int alpha_this_literal_sequence_number; | |
403 extern int alpha_this_gpdisp_sequence_number; | |
404 | |
405 /* Since the bits of the _init and _fini function is spread across | |
406 many object files, each potentially with its own GP, we must assume | |
407 we need to load our GP. Further, the .init/.fini section can | |
408 easily be more than 4MB away from the function to call so we can't | |
409 use bsr. */ | |
410 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ | |
411 asm (SECTION_OP "\n" \ | |
412 " br $29,1f\n" \ | |
413 "1: ldgp $29,0($29)\n" \ | |
414 " unop\n" \ | |
415 " jsr $26," USER_LABEL_PREFIX #FUNC "\n" \ | |
416 " .align 3\n" \ | |
417 " .previous"); | |
418 | |
419 /* If we have the capability create headers for efficient EH lookup. | |
420 As of Jan 2002, only glibc 2.2.4 can actually make use of this, but | |
421 I imagine that other systems will catch up. In the meantime, it | |
422 doesn't harm to make sure that the data exists to be used later. */ | |
423 #if defined(HAVE_LD_EH_FRAME_HDR) | |
424 #define LINK_EH_SPEC "%{!static:--eh-frame-hdr} " | |
425 #endif | |
426 | |
427 /* A C statement (sans semicolon) to output to the stdio stream STREAM | |
428 any text necessary for declaring the name of an external symbol | |
429 named NAME which is referenced in this compilation but not defined. | |
430 It is needed to properly support non-default visibility. */ | |
431 | |
432 #ifndef ASM_OUTPUT_EXTERNAL | |
433 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ | |
434 default_elf_asm_output_external (FILE, DECL, NAME) | |
435 #endif |