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source: trunk/third/gcc/config/svr4.h @ 8834

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Revision 8834, 32.6 KB checked in by ghudson, 28 years ago (diff)
This commit was generated by cvs2svn to compensate for changes in r8833, which included commits to RCS files with non-trunk default branches.

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1	/* Operating system specific defines to be used when targeting GCC for some
2	generic System V Release 4 system.
3	Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
4	Contributed by Ron Guilmette (rfg@segfault.us.com).
5
6	This file is part of GNU CC.
7
8	GNU CC 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 2, or (at your option)
11	any later version.
12
13	GNU CC 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 GNU CC; see the file COPYING. If not, write to
20	the Free Software Foundation, 59 Temple Place - Suite 330,
21	Boston, MA 02111-1307, 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	/* Define a symbol indicating that we are using svr4.h. */
43	#define USING_SVR4_H
44
45	/* For the sake of libgcc2.c, indicate target supports atexit. */
46	#define HAVE_ATEXIT
47
48	/* Cpp, assembler, linker, library, and startfile spec's. */
49
50	/* This defines which switch letters take arguments. On svr4, most of
51	the normal cases (defined in gcc.c) apply, and we also have -h* and
52	-z* options (for the linker). Note however that there is no such
53	thing as a -T option for svr4. */
54
55	#define SWITCH_TAKES_ARG(CHAR) \
56	( (CHAR) == 'D' \
57	\|\| (CHAR) == 'U' \
58	\|\| (CHAR) == 'o' \
59	\|\| (CHAR) == 'e' \
60	\|\| (CHAR) == 'u' \
61	\|\| (CHAR) == 'I' \
62	\|\| (CHAR) == 'm' \
63	\|\| (CHAR) == 'L' \
64	\|\| (CHAR) == 'A' \
65	\|\| (CHAR) == 'h' \
66	\|\| (CHAR) == 'z')
67
68	/* This defines which multi-letter switches take arguments. On svr4,
69	there are no such switches except those implemented by GCC itself. */
70
71	#define WORD_SWITCH_TAKES_ARG(STR) \
72	(DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
73	&& strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \
74	&& strcmp (STR, "Tbss"))
75
76	/* You should redefine CPP_PREDEFINES in any file which includes this one.
77	The definition should be appropriate for the type of target system
78	involved, and it should include any -A (assertion) options which are
79	appropriate for the given target system. */
80	#undef CPP_PREDEFINES
81
82	/* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
83	many of the specialized svr4 assembler options as seems reasonable,
84	given that there are certain options which we can't (or shouldn't)
85	support directly due to the fact that they conflict with other options
86	for other svr4 tools (e.g. ld) or with other options for GCC itself.
87	For example, we don't support the -o (output file) or -R (remove
88	input file) options because GCC already handles these things. We
89	also don't support the -m (run m4) option for the assembler because
90	that conflicts with the -m (produce load map) option of the svr4
91	linker. We do however allow passing arbitrary options to the svr4
92	assembler via the -Wa, option.
93
94	Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
95	option.
96	*/
97
98	#undef ASM_SPEC
99	#define ASM_SPEC \
100	"%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,} %{Yd,} %{Wa,:%}"
101
102	/* svr4 assemblers need the `-' (indicating input from stdin) to come after
103	the -o option (and its argument) for some reason. If we try to put it
104	before the -o option, the assembler will try to read the file named as
105	the output file in the -o option as an input file (after it has already
106	written some stuff to it) and the binary stuff contained therein will
107	cause totally confuse the assembler, resulting in many spurious error
108	messages. */
109
110	#undef ASM_FINAL_SPEC
111	#define ASM_FINAL_SPEC "%{pipe:-}"
112
113	/* Under svr4, the normal location of the `ld' and `as' programs is the
114	/usr/ccs/bin directory. */
115
116	#undef MD_EXEC_PREFIX
117	#define MD_EXEC_PREFIX "/usr/ccs/bin/"
118
119	/* Under svr4, the normal location of the various crt.o files is the
120	/usr/ccs/lib directory. */
121
122	#undef MD_STARTFILE_PREFIX
123	#define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
124
125	/* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
126	standard C library (unless we are building a shared library). */
127
128	#undef LIB_SPEC
129	#define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
130
131	/* Provide a LIBGCC_SPEC appropriate for svr4. We also want to exclude
132	libgcc when -symbolic. */
133
134	#undef LIBGCC_SPEC
135	#define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}"
136
137	/* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own
138	magical crtend.o file (see crtstuff.c) which provides part of the
139	support for getting C++ file-scope static object constructed before
140	entering `main', followed by the normal svr3/svr4 "finalizer" file,
141	which is either `gcrtn.o' or `crtn.o'. */
142
143	#undef ENDFILE_SPEC
144	#define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}"
145
146	/* Provide a LINK_SPEC appropriate for svr4. Here we provide support
147	for the special GCC options -static, -shared, and -symbolic which
148	allow us to link things in one of these three modes by applying the
149	appropriate combinations of options at link-time. We also provide
150	support here for as many of the other svr4 linker options as seems
151	reasonable, given that some of them conflict with options for other
152	svr4 tools (e.g. the assembler). In particular, we do support the
153	-h, -z, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
154	-l, -o, -r, -s, -u, and -L options are directly supported
155	by gcc.c itself. We don't directly support the -m (generate load
156	map) option because that conflicts with the -m (run m4) option of
157	the svr4 assembler. We also don't directly support the svr4 linker's
158	-I* or -M* options because these conflict with existing GCC options.
159	We do however allow passing arbitrary options to the svr4 linker
160	via the -Wl, option. We don't support the svr4 linker's -a option
161	at all because it is totally useless and because it conflicts with
162	GCC's own -a option.
163
164	Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
165
166	When the -G link option is used (-shared and -symbolic) a final link is
167	not being done. */
168
169	#undef LINK_SPEC
170	#define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
171	%{b} %{Wl,:%} \
172	%{static:-dn -Bstatic} \
173	%{shared:-G -dy -z text %{!h:%{o:-h %*}}} \
174	%{symbolic:-Bsymbolic -G -dy -z text %{!h:%{o:-h %*}}} \
175	%{G:-G} \
176	%{YP,*} \
177	%{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
178	%{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
179	%{Qy:} %{!Qn:-Qy}"
180
181	/* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
182	/usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
183	link step (depending upon the other gcc options selected, such as
184	-traditional and -ansi). These files each contain one (initialized)
185	copy of a special variable called `_lib_version'. Each one of these
186	files has `_lib_version' initialized to a different (enum) value.
187	The SVR4 library routines query the value of `_lib_version' at run
188	to decide how they should behave. Specifically, they decide (based
189	upon the value of `_lib_version') if they will act in a strictly ANSI
190	conforming manner or not.
191	*/
192
193	#undef STARTFILE_SPEC
194	#define STARTFILE_SPEC "%{!shared: \
195	%{!symbolic: \
196	%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
197	%{pg:gcrti.o%s}%{!pg:crti.o%s} \
198	%{ansi:values-Xc.o%s} \
199	%{!ansi: \
200	%{traditional:values-Xt.o%s} \
201	%{!traditional:values-Xa.o%s}} \
202	crtbegin.o%s"
203
204	/* Attach a special .ident directive to the end of the file to identify
205	the version of GCC which compiled this code. The format of the
206	.ident string is patterned after the ones produced by native svr4
207	C compilers. */
208
209	#define IDENT_ASM_OP ".ident"
210
211	#define ASM_FILE_END(FILE) \
212	do { \
213	fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
214	IDENT_ASM_OP, version_string); \
215	} while (0)
216
217	/* Allow #sccs in preprocessor. */
218
219	#define SCCS_DIRECTIVE
220
221	/* Output #ident as a .ident. */
222
223	#define ASM_OUTPUT_IDENT(FILE, NAME) \
224	fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
225
226	/* Use periods rather than dollar signs in special g++ assembler names. */
227
228	#define NO_DOLLAR_IN_LABEL
229
230	/* Writing `int' for a bitfield forces int alignment for the structure. */
231
232	#define PCC_BITFIELD_TYPE_MATTERS 1
233
234	/* Implicit library calls should use memcpy, not bcopy, etc. */
235
236	#define TARGET_MEM_FUNCTIONS
237
238	/* Handle #pragma weak and #pragma pack. */
239
240	#define HANDLE_SYSV_PRAGMA
241
242	/* System V Release 4 uses DWARF debugging info. */
243
244	#define DWARF_DEBUGGING_INFO
245
246	/* The numbers used to denote specific machine registers in the System V
247	Release 4 DWARF debugging information are quite likely to be totally
248	different from the numbers used in BSD stabs debugging information
249	for the same kind of target machine. Thus, we undefine the macro
250	DBX_REGISTER_NUMBER here as an extra inducement to get people to
251	provide proper machine-specific definitions of DBX_REGISTER_NUMBER
252	(which is also used to provide DWARF registers numbers in dwarfout.c)
253	in their tm.h files which include this file. */
254
255	#undef DBX_REGISTER_NUMBER
256
257	/* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
258	in general, although it will only work when using gas. */
259
260	#define DBX_DEBUGGING_INFO
261
262	/* Use DWARF debugging info by default. */
263
264	#ifndef PREFERRED_DEBUGGING_TYPE
265	#define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
266	#endif
267
268	/* Make LBRAC and RBRAC addresses relative to the start of the
269	function. The native Solaris stabs debugging format works this
270	way, gdb expects it, and it reduces the number of relocation
271	entries. */
272
273	#define DBX_BLOCKS_FUNCTION_RELATIVE 1
274
275	/* When using stabs, gcc2_compiled must be a stabs entry, not an
276	ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
277	the input piecemeal, starting with each N_SO, it's a lot easier if
278	the gcc2 flag symbol is after the N_SO rather than before it. So
279	we emit an N_OPT stab there. */
280
281	#define ASM_IDENTIFY_GCC(FILE) \
282	do \
283	{ \
284	if (write_symbols != DBX_DEBUG) \
285	fputs ("gcc2_compiled.:\n", FILE); \
286	} \
287	while (0)
288
289	#define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
290	do \
291	{ \
292	if (write_symbols == DBX_DEBUG) \
293	fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
294	} \
295	while (0)
296
297	/* Like block addresses, stabs line numbers are relative to the
298	current function. */
299
300	#define ASM_OUTPUT_SOURCE_LINE(file, line) \
301	do \
302	{ \
303	static int sym_lineno = 1; \
304	fprintf (file, ".stabn 68,0,%d,.LM%d-", \
305	line, sym_lineno); \
306	assemble_name (file, \
307	XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
308	fprintf (file, "\n.LM%d:\n", sym_lineno); \
309	sym_lineno += 1; \
310	} \
311	while (0)
312
313	/* In order for relative line numbers to work, we must output the
314	stabs entry for the function name first. */
315
316	#define DBX_FUNCTION_FIRST
317
318	/* Generate a blank trailing N_SO to mark the end of the .o file, since
319	we can't depend upon the linker to mark .o file boundaries with
320	embedded stabs. */
321
322	#define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
323	fprintf (FILE, \
324	"\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
325
326	/* Define the actual types of some ANSI-mandated types. (These
327	definitions should work for most SVR4 systems). */
328
329	#undef SIZE_TYPE
330	#define SIZE_TYPE "unsigned int"
331
332	#undef PTRDIFF_TYPE
333	#define PTRDIFF_TYPE "int"
334
335	#undef WCHAR_TYPE
336	#define WCHAR_TYPE "long int"
337
338	#undef WCHAR_TYPE_SIZE
339	#define WCHAR_TYPE_SIZE BITS_PER_WORD
340
341	/* This causes trouble, because it requires the host machine
342	to support ANSI C. */
343	/* #define MULTIBYTE_CHARS */
344
345	#undef ASM_BYTE_OP
346	#define ASM_BYTE_OP ".byte"
347
348	#undef SET_ASM_OP
349	#define SET_ASM_OP ".set"
350
351	/* This is how to begin an assembly language file. Most svr4 assemblers want
352	at least a .file directive to come first, and some want to see a .version
353	directive come right after that. Here we just establish a default
354	which generates only the .file directive. If you need a .version
355	directive for any specific target, you should override this definition
356	in the target-specific file which includes this one. */
357
358	#undef ASM_FILE_START
359	#define ASM_FILE_START(FILE) \
360	output_file_directive ((FILE), main_input_filename)
361
362	/* This is how to allocate empty space in some section. The .zero
363	pseudo-op is used for this on most svr4 assemblers. */
364
365	#define SKIP_ASM_OP ".zero"
366
367	#undef ASM_OUTPUT_SKIP
368	#define ASM_OUTPUT_SKIP(FILE,SIZE) \
369	fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
370
371	/* This is how to output a reference to a user-level label named NAME.
372	`assemble_name' uses this.
373
374	For System V Release 4 the convention is not to prepend a leading
375	underscore onto user-level symbol names. */
376
377	#undef ASM_OUTPUT_LABELREF
378	#define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
379
380	/* This is how to output an internal numbered label where
381	PREFIX is the class of label and NUM is the number within the class.
382
383	For most svr4 systems, the convention is that any symbol which begins
384	with a period is not put into the linker symbol table by the assembler. */
385
386	#undef ASM_OUTPUT_INTERNAL_LABEL
387	#define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
388	do { \
389	fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
390	} while (0)
391
392	/* This is how to store into the string LABEL
393	the symbol_ref name of an internal numbered label where
394	PREFIX is the class of label and NUM is the number within the class.
395	This is suitable for output with `assemble_name'.
396
397	For most svr4 systems, the convention is that any symbol which begins
398	with a period is not put into the linker symbol table by the assembler. */
399
400	#undef ASM_GENERATE_INTERNAL_LABEL
401	#define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
402	do { \
403	sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
404	} while (0)
405
406	/* Output the label which precedes a jumptable. Note that for all svr4
407	systems where we actually generate jumptables (which is to say every
408	svr4 target except i386, where we use casesi instead) we put the jump-
409	tables into the .rodata section and since other stuff could have been
410	put into the .rodata section prior to any given jumptable, we have to
411	make sure that the location counter for the .rodata section gets pro-
412	perly re-aligned prior to the actual beginning of the jump table. */
413
414	#define ALIGN_ASM_OP ".align"
415
416	#ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
417	#define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
418	ASM_OUTPUT_ALIGN ((FILE), 2);
419	#endif
420
421	#undef ASM_OUTPUT_CASE_LABEL
422	#define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
423	do { \
424	ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
425	ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
426	} while (0)
427
428	/* The standard SVR4 assembler seems to require that certain builtin
429	library routines (e.g. .udiv) be explicitly declared as .globl
430	in each assembly file where they are referenced. */
431
432	#define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
433	ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
434
435	/* This says how to output assembler code to declare an
436	uninitialized external linkage data object. Under SVR4,
437	the linker seems to want the alignment of data objects
438	to depend on their types. We do exactly that here. */
439
440	#define COMMON_ASM_OP ".comm"
441
442	#undef ASM_OUTPUT_ALIGNED_COMMON
443	#define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
444	do { \
445	fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
446	assemble_name ((FILE), (NAME)); \
447	fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
448	} while (0)
449
450	/* This says how to output assembler code to declare an
451	uninitialized internal linkage data object. Under SVR4,
452	the linker seems to want the alignment of data objects
453	to depend on their types. We do exactly that here. */
454
455	#define LOCAL_ASM_OP ".local"
456
457	#undef ASM_OUTPUT_ALIGNED_LOCAL
458	#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
459	do { \
460	fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
461	assemble_name ((FILE), (NAME)); \
462	fprintf ((FILE), "\n"); \
463	ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
464	} while (0)
465
466	/* This is the pseudo-op used to generate a 32-bit word of data with a
467	specific value in some section. This is the same for all known svr4
468	assemblers. */
469
470	#define INT_ASM_OP ".long"
471
472	/* This is the pseudo-op used to generate a contiguous sequence of byte
473	values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
474	AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
475
476	#undef ASCII_DATA_ASM_OP
477	#define ASCII_DATA_ASM_OP ".ascii"
478
479	/* Support const sections and the ctors and dtors sections for g++.
480	Note that there appears to be two different ways to support const
481	sections at the moment. You can either #define the symbol
482	READONLY_DATA_SECTION (giving it some code which switches to the
483	readonly data section) or else you can #define the symbols
484	EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
485	SELECT_RTX_SECTION. We do both here just to be on the safe side. */
486
487	#define USE_CONST_SECTION 1
488
489	#define CONST_SECTION_ASM_OP ".section\t.rodata"
490
491	/* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
492
493	Note that we want to give these sections the SHF_WRITE attribute
494	because these sections will actually contain data (i.e. tables of
495	addresses of functions in the current root executable or shared library
496	file) and, in the case of a shared library, the relocatable addresses
497	will have to be properly resolved/relocated (and then written into) by
498	the dynamic linker when it actually attaches the given shared library
499	to the executing process. (Note that on SVR4, you may wish to use the
500	`-z text' option to the ELF linker, when building a shared library, as
501	an additional check that you are doing everything right. But if you do
502	use the `-z text' option when building a shared library, you will get
503	errors unless the .ctors and .dtors sections are marked as writable
504	via the SHF_WRITE attribute.) */
505
506	#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
507	#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
508
509	/* On svr4, we do have support for the .init and .fini sections, and we
510	can put stuff in there to be executed before and after `main'. We let
511	crtstuff.c and other files know this by defining the following symbols.
512	The definitions say how to change sections to the .init and .fini
513	sections. This is the same for all known svr4 assemblers. */
514
515	#define INIT_SECTION_ASM_OP ".section\t.init"
516	#define FINI_SECTION_ASM_OP ".section\t.fini"
517
518	/* A default list of other sections which we might be "in" at any given
519	time. For targets that use additional sections (e.g. .tdesc) you
520	should override this definition in the target-specific file which
521	includes this file. */
522
523	#undef EXTRA_SECTIONS
524	#define EXTRA_SECTIONS in_const, in_ctors, in_dtors
525
526	/* A default list of extra section function definitions. For targets
527	that use additional sections (e.g. .tdesc) you should override this
528	definition in the target-specific file which includes this file. */
529
530	#undef EXTRA_SECTION_FUNCTIONS
531	#define EXTRA_SECTION_FUNCTIONS \
532	CONST_SECTION_FUNCTION \
533	CTORS_SECTION_FUNCTION \
534	DTORS_SECTION_FUNCTION
535
536	#define READONLY_DATA_SECTION() const_section ()
537
538	extern void text_section ();
539
540	#define CONST_SECTION_FUNCTION \
541	void \
542	const_section () \
543	{ \
544	if (!USE_CONST_SECTION) \
545	text_section(); \
546	else if (in_section != in_const) \
547	{ \
548	fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
549	in_section = in_const; \
550	} \
551	}
552
553	#define CTORS_SECTION_FUNCTION \
554	void \
555	ctors_section () \
556	{ \
557	if (in_section != in_ctors) \
558	{ \
559	fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
560	in_section = in_ctors; \
561	} \
562	}
563
564	#define DTORS_SECTION_FUNCTION \
565	void \
566	dtors_section () \
567	{ \
568	if (in_section != in_dtors) \
569	{ \
570	fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
571	in_section = in_dtors; \
572	} \
573	}
574
575	/* Switch into a generic section.
576	This is currently only used to support section attributes.
577
578	We make the section read-only and executable for a function decl,
579	read-only for a const data decl, and writable for a non-const data decl. */
580	#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
581	fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \
582	(DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
583	(DECL) && TREE_READONLY (DECL) ? "a" : "aw")
584
585
586	/* A C statement (sans semicolon) to output an element in the table of
587	global constructors. */
588	#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
589	do { \
590	ctors_section (); \
591	fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
592	assemble_name (FILE, NAME); \
593	fprintf (FILE, "\n"); \
594	} while (0)
595
596	/* A C statement (sans semicolon) to output an element in the table of
597	global destructors. */
598	#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
599	do { \
600	dtors_section (); \
601	fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
602	assemble_name (FILE, NAME); \
603	fprintf (FILE, "\n"); \
604	} while (0)
605
606	/* A C statement or statements to switch to the appropriate
607	section for output of DECL. DECL is either a `VAR_DECL' node
608	or a constant of some sort. RELOC indicates whether forming
609	the initial value of DECL requires link-time relocations. */
610
611	#define SELECT_SECTION(DECL,RELOC) \
612	{ \
613	if (TREE_CODE (DECL) == STRING_CST) \
614	{ \
615	if (! flag_writable_strings) \
616	const_section (); \
617	else \
618	data_section (); \
619	} \
620	else if (TREE_CODE (DECL) == VAR_DECL) \
621	{ \
622	if ((flag_pic && RELOC) \
623	\|\| !TREE_READONLY (DECL) \|\| TREE_SIDE_EFFECTS (DECL) \
624	\|\| !DECL_INITIAL (DECL) \
625	\|\| (DECL_INITIAL (DECL) != error_mark_node \
626	&& !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
627	data_section (); \
628	else \
629	const_section (); \
630	} \
631	else \
632	const_section (); \
633	}
634
635	/* A C statement or statements to switch to the appropriate
636	section for output of RTX in mode MODE. RTX is some kind
637	of constant in RTL. The argument MODE is redundant except
638	in the case of a `const_int' rtx. Currently, these always
639	go into the const section. */
640
641	#undef SELECT_RTX_SECTION
642	#define SELECT_RTX_SECTION(MODE,RTX) const_section()
643
644	/* Define the strings used for the special svr4 .type and .size directives.
645	These strings generally do not vary from one system running svr4 to
646	another, but if a given system (e.g. m88k running svr) needs to use
647	different pseudo-op names for these, they may be overridden in the
648	file which includes this one. */
649
650	#define TYPE_ASM_OP ".type"
651	#define SIZE_ASM_OP ".size"
652
653	/* This is how we tell the assembler that a symbol is weak. */
654
655	#define ASM_WEAKEN_LABEL(FILE,NAME) \
656	do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
657	fputc ('\n', FILE); } while (0)
658
659	/* The following macro defines the format used to output the second
660	operand of the .type assembler directive. Different svr4 assemblers
661	expect various different forms for this operand. The one given here
662	is just a default. You may need to override it in your machine-
663	specific tm.h file (depending upon the particulars of your assembler). */
664
665	#define TYPE_OPERAND_FMT "@%s"
666
667	/* Write the extra assembler code needed to declare a function's result.
668	Most svr4 assemblers don't require any special declaration of the
669	result value, but there are exceptions. */
670
671	#ifndef ASM_DECLARE_RESULT
672	#define ASM_DECLARE_RESULT(FILE, RESULT)
673	#endif
674
675	/* These macros generate the special .type and .size directives which
676	are used to set the corresponding fields of the linker symbol table
677	entries in an ELF object file under SVR4. These macros also output
678	the starting labels for the relevant functions/objects. */
679
680	/* Write the extra assembler code needed to declare a function properly.
681	Some svr4 assemblers need to also have something extra said about the
682	function's return value. We allow for that here. */
683
684	#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
685	do { \
686	fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
687	assemble_name (FILE, NAME); \
688	putc (',', FILE); \
689	fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
690	putc ('\n', FILE); \
691	ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
692	ASM_OUTPUT_LABEL(FILE, NAME); \
693	} while (0)
694
695	/* Write the extra assembler code needed to declare an object properly. */
696
697	#define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
698	do { \
699	fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
700	assemble_name (FILE, NAME); \
701	putc (',', FILE); \
702	fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
703	putc ('\n', FILE); \
704	size_directive_output = 0; \
705	if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
706	{ \
707	size_directive_output = 1; \
708	fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
709	assemble_name (FILE, NAME); \
710	fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
711	} \
712	ASM_OUTPUT_LABEL(FILE, NAME); \
713	} while (0)
714
715	/* Output the size directive for a decl in rest_of_decl_compilation
716	in the case where we did not do so before the initializer.
717	Once we find the error_mark_node, we know that the value of
718	size_directive_output was set
719	by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
720
721	#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
722	do { \
723	char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
724	if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
725	&& ! AT_END && TOP_LEVEL \
726	&& DECL_INITIAL (DECL) == error_mark_node \
727	&& !size_directive_output) \
728	{ \
729	size_directive_output = 1; \
730	fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
731	assemble_name (FILE, name); \
732	fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
733	} \
734	} while (0)
735
736	/* This is how to declare the size of a function. */
737
738	#define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
739	do { \
740	if (!flag_inhibit_size_directive) \
741	{ \
742	char label[256]; \
743	static int labelno; \
744	labelno++; \
745	ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
746	ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
747	fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
748	assemble_name (FILE, (FNAME)); \
749	fprintf (FILE, ","); \
750	assemble_name (FILE, label); \
751	fprintf (FILE, "-"); \
752	assemble_name (FILE, (FNAME)); \
753	putc ('\n', FILE); \
754	} \
755	} while (0)
756
757	/* A table of bytes codes used by the ASM_OUTPUT_ASCII and
758	ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
759	corresponds to a particular byte value [0..255]. For any
760	given byte value, if the value in the corresponding table
761	position is zero, the given character can be output directly.
762	If the table value is 1, the byte must be output as a \ooo
763	octal escape. If the tables value is anything else, then the
764	byte value should be output as a \ followed by the value
765	in the table. Note that we can use standard UN*X escape
766	sequences for many control characters, but we don't use
767	\a to represent BEL because some svr4 assemblers (e.g. on
768	the i386) don't know about that. Also, we don't use \v
769	since some versions of gas, such as 2.2 did not accept it. */
770
771	#define ESCAPES \
772	"\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\
773	\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\
774	\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\
775	\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\
776	\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\
777	\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\
778	\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\
779	\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"
780
781	/* Some svr4 assemblers have a limit on the number of characters which
782	can appear in the operand of a .string directive. If your assembler
783	has such a limitation, you should define STRING_LIMIT to reflect that
784	limit. Note that at least some svr4 assemblers have a limit on the
785	actual number of bytes in the double-quoted string, and that they
786	count each character in an escape sequence as one byte. Thus, an
787	escape sequence like \377 would count as four bytes.
788
789	If your target assembler doesn't support the .string directive, you
790	should define this to zero.
791	*/
792
793	#define STRING_LIMIT ((unsigned) 256)
794
795	#define STRING_ASM_OP ".string"
796
797	/* The routine used to output NUL terminated strings. We use a special
798	version of this for most svr4 targets because doing so makes the
799	generated assembly code more compact (and thus faster to assemble)
800	as well as more readable, especially for targets like the i386
801	(where the only alternative is to output character sequences as
802	comma separated lists of numbers). */
803
804	#define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
805	do \
806	{ \
807	register unsigned char _limited_str = (unsigned char ) (STR); \
808	register unsigned ch; \
809	fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
810	for (; ch = *_limited_str; _limited_str++) \
811	{ \
812	register int escape; \
813	switch (escape = ESCAPES[ch]) \
814	{ \
815	case 0: \
816	putc (ch, (FILE)); \
817	break; \
818	case 1: \
819	fprintf ((FILE), "\\%03o", ch); \
820	break; \
821	default: \
822	putc ('\\', (FILE)); \
823	putc (escape, (FILE)); \
824	break; \
825	} \
826	} \
827	fprintf ((FILE), "\"\n"); \
828	} \
829	while (0)
830
831	/* The routine used to output sequences of byte values. We use a special
832	version of this for most svr4 targets because doing so makes the
833	generated assembly code more compact (and thus faster to assemble)
834	as well as more readable. Note that if we find subparts of the
835	character sequence which end with NUL (and which are shorter than
836	STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
837
838	#undef ASM_OUTPUT_ASCII
839	#define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
840	do \
841	{ \
842	register unsigned char _ascii_bytes = (unsigned char ) (STR); \
843	register unsigned char *limit = _ascii_bytes + (LENGTH); \
844	register unsigned bytes_in_chunk = 0; \
845	for (; _ascii_bytes < limit; _ascii_bytes++) \
846	{ \
847	register unsigned char *p; \
848	if (bytes_in_chunk >= 60) \
849	{ \
850	fprintf ((FILE), "\"\n"); \
851	bytes_in_chunk = 0; \
852	} \
853	for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
854	continue; \
855	if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
856	{ \
857	if (bytes_in_chunk > 0) \
858	{ \
859	fprintf ((FILE), "\"\n"); \
860	bytes_in_chunk = 0; \
861	} \
862	ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
863	_ascii_bytes = p; \
864	} \
865	else \
866	{ \
867	register int escape; \
868	register unsigned ch; \
869	if (bytes_in_chunk == 0) \
870	fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
871	switch (escape = ESCAPES[ch = *_ascii_bytes]) \
872	{ \
873	case 0: \
874	putc (ch, (FILE)); \
875	bytes_in_chunk++; \
876	break; \
877	case 1: \
878	fprintf ((FILE), "\\%03o", ch); \
879	bytes_in_chunk += 4; \
880	break; \
881	default: \
882	putc ('\\', (FILE)); \
883	putc (escape, (FILE)); \
884	bytes_in_chunk += 2; \
885	break; \
886	} \
887	} \
888	} \
889	if (bytes_in_chunk > 0) \
890	fprintf ((FILE), "\"\n"); \
891	} \
892	while (0)
893
894	/* All SVR4 targets use the ELF object file format. */
895	#define OBJECT_FORMAT_ELF

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