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, 1996 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@segfault.us.com).
6 This file is part of GNU CC.
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)
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.
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.
23 To use this file, make up a file with a name like:
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
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.
42 /* Define a symbol indicating that we are using svr4.h. */
45 /* For the sake of libgcc2.c, indicate target supports atexit. */
48 /* Cpp, assembler, linker, library, and startfile spec's. */
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. */
55 #define SWITCH_TAKES_ARG(CHAR) \
56 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
61 /* This defines which multi-letter switches take arguments. On svr4,
62 there are no such switches except those implemented by GCC itself. */
64 #define WORD_SWITCH_TAKES_ARG(STR) \
65 (DEFAULT_WORD_SWITCH_TAKES_ARG (STR) \
66 && strcmp (STR, "Tdata") && strcmp (STR, "Ttext") \
67 && strcmp (STR, "Tbss"))
69 /* You should redefine CPP_PREDEFINES in any file which includes this one.
70 The definition should be appropriate for the type of target system
71 involved, and it should include any -A (assertion) options which are
72 appropriate for the given target system. */
75 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
76 many of the specialized svr4 assembler options as seems reasonable,
77 given that there are certain options which we can't (or shouldn't)
78 support directly due to the fact that they conflict with other options
79 for other svr4 tools (e.g. ld) or with other options for GCC itself.
80 For example, we don't support the -o (output file) or -R (remove
81 input file) options because GCC already handles these things. We
82 also don't support the -m (run m4) option for the assembler because
83 that conflicts with the -m (produce load map) option of the svr4
84 linker. We do however allow passing arbitrary options to the svr4
85 assembler via the -Wa, option.
87 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
93 "%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
95 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
96 the -o option (and its argument) for some reason. If we try to put it
97 before the -o option, the assembler will try to read the file named as
98 the output file in the -o option as an input file (after it has already
99 written some stuff to it) and the binary stuff contained therein will
100 cause totally confuse the assembler, resulting in many spurious error
103 #undef ASM_FINAL_SPEC
104 #define ASM_FINAL_SPEC "%|"
106 /* Under svr4, the normal location of the `ld' and `as' programs is the
107 /usr/ccs/bin directory. */
109 #ifndef CROSS_COMPILE
110 #undef MD_EXEC_PREFIX
111 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
114 /* Under svr4, the normal location of the various *crt*.o files is the
115 /usr/ccs/lib directory. */
117 #ifndef CROSS_COMPILE
118 #undef MD_STARTFILE_PREFIX
119 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
122 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
123 standard C library (unless we are building a shared library). */
126 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
128 /* Provide an ENDFILE_SPEC appropriate for svr4. Here we tack on our own
129 magical crtend.o file (see crtstuff.c) which provides part of the
130 support for getting C++ file-scope static object constructed before
131 entering `main', followed by the normal svr3/svr4 "finalizer" file,
132 which is either `gcrtn.o' or `crtn.o'. */
135 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
137 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
138 for the special GCC options -static, -shared, and -symbolic which
139 allow us to link things in one of these three modes by applying the
140 appropriate combinations of options at link-time. We also provide
141 support here for as many of the other svr4 linker options as seems
142 reasonable, given that some of them conflict with options for other
143 svr4 tools (e.g. the assembler). In particular, we do support the
144 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
145 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
146 by gcc.c itself. We don't directly support the -m (generate load
147 map) option because that conflicts with the -m (run m4) option of
148 the svr4 assembler. We also don't directly support the svr4 linker's
149 -I* or -M* options because these conflict with existing GCC options.
150 We do however allow passing arbitrary options to the svr4 linker
151 via the -Wl, option. We don't support the svr4 linker's -a option
152 at all because it is totally useless and because it conflicts with
155 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
157 When the -G link option is used (-shared and -symbolic) a final link is
162 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
164 %{static:-dn -Bstatic} \
165 %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \
166 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
171 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
173 %{static:-dn -Bstatic} \
174 %{shared:-G -dy -z text %{!h*:%{o*:-h %*}}} \
175 %{symbolic:-Bsymbolic -G -dy -z text %{!h*:%{o*:-h %*}}} \
178 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
179 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
183 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
184 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
185 link step (depending upon the other gcc options selected, such as
186 -traditional and -ansi). These files each contain one (initialized)
187 copy of a special variable called `_lib_version'. Each one of these
188 files has `_lib_version' initialized to a different (enum) value.
189 The SVR4 library routines query the value of `_lib_version' at run
190 to decide how they should behave. Specifically, they decide (based
191 upon the value of `_lib_version') if they will act in a strictly ANSI
192 conforming manner or not.
195 #undef STARTFILE_SPEC
196 #define STARTFILE_SPEC "%{!shared: \
198 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
199 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
200 %{ansi:values-Xc.o%s} \
202 %{traditional:values-Xt.o%s} \
203 %{!traditional:values-Xa.o%s}} \
206 /* Attach a special .ident directive to the end of the file to identify
207 the version of GCC which compiled this code. The format of the
208 .ident string is patterned after the ones produced by native svr4
211 #define IDENT_ASM_OP ".ident"
213 #define ASM_FILE_END(FILE) \
215 fprintf ((FILE), "\t%s\t\"GCC: (GNU) %s\"\n", \
216 IDENT_ASM_OP, version_string); \
219 /* Allow #sccs in preprocessor. */
221 #define SCCS_DIRECTIVE
223 /* Output #ident as a .ident. */
225 #define ASM_OUTPUT_IDENT(FILE, NAME) \
226 fprintf (FILE, "\t%s\t\"%s\"\n", IDENT_ASM_OP, NAME);
228 /* Use periods rather than dollar signs in special g++ assembler names. */
230 #define NO_DOLLAR_IN_LABEL
232 /* Writing `int' for a bitfield forces int alignment for the structure. */
234 #define PCC_BITFIELD_TYPE_MATTERS 1
236 /* Implicit library calls should use memcpy, not bcopy, etc. */
238 #define TARGET_MEM_FUNCTIONS
240 /* Handle #pragma weak and #pragma pack. */
242 #define HANDLE_SYSV_PRAGMA
244 /* System V Release 4 uses DWARF debugging info. */
246 #define DWARF_DEBUGGING_INFO
248 /* The numbers used to denote specific machine registers in the System V
249 Release 4 DWARF debugging information are quite likely to be totally
250 different from the numbers used in BSD stabs debugging information
251 for the same kind of target machine. Thus, we undefine the macro
252 DBX_REGISTER_NUMBER here as an extra inducement to get people to
253 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
254 (which is also used to provide DWARF registers numbers in dwarfout.c)
255 in their tm.h files which include this file. */
257 #undef DBX_REGISTER_NUMBER
259 /* gas on SVR4 supports the use of .stabs. Permit -gstabs to be used
260 in general, although it will only work when using gas. */
262 #define DBX_DEBUGGING_INFO
264 /* When generating stabs debugging, use N_BINCL entries. */
266 #define DBX_USE_BINCL
268 /* Use DWARF debugging info by default. */
270 #ifndef PREFERRED_DEBUGGING_TYPE
271 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
274 /* Make LBRAC and RBRAC addresses relative to the start of the
275 function. The native Solaris stabs debugging format works this
276 way, gdb expects it, and it reduces the number of relocation
279 #define DBX_BLOCKS_FUNCTION_RELATIVE 1
281 /* When using stabs, gcc2_compiled must be a stabs entry, not an
282 ordinary symbol, or gdb won't see it. Furthermore, since gdb reads
283 the input piecemeal, starting with each N_SO, it's a lot easier if
284 the gcc2 flag symbol is *after* the N_SO rather than before it. So
285 we emit an N_OPT stab there. */
287 #define ASM_IDENTIFY_GCC(FILE) \
290 if (write_symbols != DBX_DEBUG) \
291 fputs ("gcc2_compiled.:\n", FILE); \
295 #define ASM_IDENTIFY_GCC_AFTER_SOURCE(FILE) \
298 if (write_symbols == DBX_DEBUG) \
299 fputs ("\t.stabs\t\"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE); \
303 /* Like block addresses, stabs line numbers are relative to the
306 #define ASM_OUTPUT_SOURCE_LINE(file, line) \
309 static int sym_lineno = 1; \
310 fprintf (file, ".stabn 68,0,%d,.LM%d-", \
312 assemble_name (file, \
313 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
314 fprintf (file, "\n.LM%d:\n", sym_lineno); \
319 /* In order for relative line numbers to work, we must output the
320 stabs entry for the function name first. */
322 #define DBX_FUNCTION_FIRST
324 /* Generate a blank trailing N_SO to mark the end of the .o file, since
325 we can't depend upon the linker to mark .o file boundaries with
328 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME) \
330 "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
332 /* Define the actual types of some ANSI-mandated types. (These
333 definitions should work for most SVR4 systems). */
336 #define SIZE_TYPE "unsigned int"
339 #define PTRDIFF_TYPE "int"
342 #define WCHAR_TYPE "long int"
344 #undef WCHAR_TYPE_SIZE
345 #define WCHAR_TYPE_SIZE BITS_PER_WORD
347 /* This causes trouble, because it requires the host machine
348 to support ANSI C. */
349 /* #define MULTIBYTE_CHARS */
352 #define ASM_BYTE_OP ".byte"
355 #define SET_ASM_OP ".set"
357 /* This is how to begin an assembly language file. Most svr4 assemblers want
358 at least a .file directive to come first, and some want to see a .version
359 directive come right after that. Here we just establish a default
360 which generates only the .file directive. If you need a .version
361 directive for any specific target, you should override this definition
362 in the target-specific file which includes this one. */
364 #undef ASM_FILE_START
365 #define ASM_FILE_START(FILE) \
366 output_file_directive ((FILE), main_input_filename)
368 /* This is how to allocate empty space in some section. The .zero
369 pseudo-op is used for this on most svr4 assemblers. */
371 #define SKIP_ASM_OP ".zero"
373 #undef ASM_OUTPUT_SKIP
374 #define ASM_OUTPUT_SKIP(FILE,SIZE) \
375 fprintf (FILE, "\t%s\t%u\n", SKIP_ASM_OP, (SIZE))
377 /* This is how to output a reference to a user-level label named NAME.
378 `assemble_name' uses this.
380 For System V Release 4 the convention is *not* to prepend a leading
381 underscore onto user-level symbol names. */
383 #undef ASM_OUTPUT_LABELREF
384 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
386 /* This is how to output an internal numbered label where
387 PREFIX is the class of label and NUM is the number within the class.
389 For most svr4 systems, the convention is that any symbol which begins
390 with a period is not put into the linker symbol table by the assembler. */
392 #undef ASM_OUTPUT_INTERNAL_LABEL
393 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
395 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
398 /* This is how to store into the string LABEL
399 the symbol_ref name of an internal numbered label where
400 PREFIX is the class of label and NUM is the number within the class.
401 This is suitable for output with `assemble_name'.
403 For most svr4 systems, the convention is that any symbol which begins
404 with a period is not put into the linker symbol table by the assembler. */
406 #undef ASM_GENERATE_INTERNAL_LABEL
407 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
409 sprintf (LABEL, "*.%s%d", PREFIX, NUM); \
412 /* Output the label which precedes a jumptable. Note that for all svr4
413 systems where we actually generate jumptables (which is to say every
414 svr4 target except i386, where we use casesi instead) we put the jump-
415 tables into the .rodata section and since other stuff could have been
416 put into the .rodata section prior to any given jumptable, we have to
417 make sure that the location counter for the .rodata section gets pro-
418 perly re-aligned prior to the actual beginning of the jump table. */
420 #define ALIGN_ASM_OP ".align"
422 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
423 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
424 ASM_OUTPUT_ALIGN ((FILE), 2);
427 #undef ASM_OUTPUT_CASE_LABEL
428 #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,JUMPTABLE) \
430 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
431 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
434 /* The standard SVR4 assembler seems to require that certain builtin
435 library routines (e.g. .udiv) be explicitly declared as .globl
436 in each assembly file where they are referenced. */
438 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
439 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
441 /* This says how to output assembler code to declare an
442 uninitialized external linkage data object. Under SVR4,
443 the linker seems to want the alignment of data objects
444 to depend on their types. We do exactly that here. */
446 #define COMMON_ASM_OP ".comm"
448 #undef ASM_OUTPUT_ALIGNED_COMMON
449 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
451 fprintf ((FILE), "\t%s\t", COMMON_ASM_OP); \
452 assemble_name ((FILE), (NAME)); \
453 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
456 /* This says how to output assembler code to declare an
457 uninitialized internal linkage data object. Under SVR4,
458 the linker seems to want the alignment of data objects
459 to depend on their types. We do exactly that here. */
461 #define LOCAL_ASM_OP ".local"
463 #undef ASM_OUTPUT_ALIGNED_LOCAL
464 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
466 fprintf ((FILE), "\t%s\t", LOCAL_ASM_OP); \
467 assemble_name ((FILE), (NAME)); \
468 fprintf ((FILE), "\n"); \
469 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
472 /* Biggest alignment supported by the object file format of this
473 machine. Use this macro to limit the alignment which can be
474 specified using the `__attribute__ ((aligned (N)))' construct. If
475 not defined, the default value is `BIGGEST_ALIGNMENT'. */
477 #define MAX_OFILE_ALIGNMENT (32768*8)
479 /* This is the pseudo-op used to generate a 32-bit word of data with a
480 specific value in some section. This is the same for all known svr4
483 #define INT_ASM_OP ".long"
485 /* This is the pseudo-op used to generate a contiguous sequence of byte
486 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
487 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
489 #undef ASCII_DATA_ASM_OP
490 #define ASCII_DATA_ASM_OP ".ascii"
492 /* Support const sections and the ctors and dtors sections for g++.
493 Note that there appears to be two different ways to support const
494 sections at the moment. You can either #define the symbol
495 READONLY_DATA_SECTION (giving it some code which switches to the
496 readonly data section) or else you can #define the symbols
497 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
498 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
500 #define USE_CONST_SECTION 1
502 #define CONST_SECTION_ASM_OP ".section\t.rodata"
504 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
506 Note that we want to give these sections the SHF_WRITE attribute
507 because these sections will actually contain data (i.e. tables of
508 addresses of functions in the current root executable or shared library
509 file) and, in the case of a shared library, the relocatable addresses
510 will have to be properly resolved/relocated (and then written into) by
511 the dynamic linker when it actually attaches the given shared library
512 to the executing process. (Note that on SVR4, you may wish to use the
513 `-z text' option to the ELF linker, when building a shared library, as
514 an additional check that you are doing everything right. But if you do
515 use the `-z text' option when building a shared library, you will get
516 errors unless the .ctors and .dtors sections are marked as writable
517 via the SHF_WRITE attribute.) */
519 #define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\""
520 #define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\""
522 /* On svr4, we *do* have support for the .init and .fini sections, and we
523 can put stuff in there to be executed before and after `main'. We let
524 crtstuff.c and other files know this by defining the following symbols.
525 The definitions say how to change sections to the .init and .fini
526 sections. This is the same for all known svr4 assemblers. */
528 #define INIT_SECTION_ASM_OP ".section\t.init"
529 #define FINI_SECTION_ASM_OP ".section\t.fini"
531 /* A default list of other sections which we might be "in" at any given
532 time. For targets that use additional sections (e.g. .tdesc) you
533 should override this definition in the target-specific file which
534 includes this file. */
536 #undef EXTRA_SECTIONS
537 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
539 /* A default list of extra section function definitions. For targets
540 that use additional sections (e.g. .tdesc) you should override this
541 definition in the target-specific file which includes this file. */
543 #undef EXTRA_SECTION_FUNCTIONS
544 #define EXTRA_SECTION_FUNCTIONS \
545 CONST_SECTION_FUNCTION \
546 CTORS_SECTION_FUNCTION \
547 DTORS_SECTION_FUNCTION
549 #define READONLY_DATA_SECTION() const_section ()
551 extern void text_section ();
553 #define CONST_SECTION_FUNCTION \
557 if (!USE_CONST_SECTION) \
559 else if (in_section != in_const) \
561 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
562 in_section = in_const; \
566 #define CTORS_SECTION_FUNCTION \
570 if (in_section != in_ctors) \
572 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
573 in_section = in_ctors; \
577 #define DTORS_SECTION_FUNCTION \
581 if (in_section != in_dtors) \
583 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
584 in_section = in_dtors; \
590 * Switch into a generic section.
592 * We make the section read-only and executable for a function decl,
593 * read-only for a const data decl, and writable for a non-const data decl.
595 * If the section has already been defined, we must not
596 * emit the attributes here. The SVR4 assembler does not
597 * recognize section redefinitions.
598 * If DECL is NULL, no attributes are emitted.
600 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME) \
602 static struct section_info \
604 struct section_info *next; \
606 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
608 struct section_info *s; \
610 enum sect_enum type; \
612 for (s = sections; s; s = s->next) \
613 if (!strcmp (NAME, s->name)) \
618 if (TREE_CODE (DECL) == FUNCTION_DECL) \
619 type = SECT_EXEC, mode = "ax"; \
620 else if (TREE_READONLY(DECL)) \
621 type = SECT_RO, mode = "a"; \
623 type = SECT_RW, mode = "aw"; \
626 if (s == 0 && DECL) \
628 s = (struct section_info *) xmalloc (sizeof (struct section_info)); \
629 s->name = xmalloc ((strlen (NAME) + 1) * sizeof (*NAME)); \
630 strcpy (s->name, NAME); \
632 s->next = sections; \
634 fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, mode); \
638 if (DECL && s->type != type) \
639 error_with_decl (DECL, "%s causes a section type conflict"); \
641 fprintf (FILE, ".section\t%s\n", NAME); \
645 /* A C statement (sans semicolon) to output an element in the table of
646 global constructors. */
647 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
650 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
651 assemble_name (FILE, NAME); \
652 fprintf (FILE, "\n"); \
655 /* A C statement (sans semicolon) to output an element in the table of
656 global destructors. */
657 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
660 fprintf (FILE, "\t%s\t ", INT_ASM_OP); \
661 assemble_name (FILE, NAME); \
662 fprintf (FILE, "\n"); \
665 /* A C statement or statements to switch to the appropriate
666 section for output of DECL. DECL is either a `VAR_DECL' node
667 or a constant of some sort. RELOC indicates whether forming
668 the initial value of DECL requires link-time relocations. */
670 #define SELECT_SECTION(DECL,RELOC) \
672 if (TREE_CODE (DECL) == STRING_CST) \
674 if (! flag_writable_strings) \
679 else if (TREE_CODE (DECL) == VAR_DECL) \
681 if ((flag_pic && RELOC) \
682 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
683 || !DECL_INITIAL (DECL) \
684 || (DECL_INITIAL (DECL) != error_mark_node \
685 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
694 /* A C statement or statements to switch to the appropriate
695 section for output of RTX in mode MODE. RTX is some kind
696 of constant in RTL. The argument MODE is redundant except
697 in the case of a `const_int' rtx. Currently, these always
698 go into the const section. */
700 #undef SELECT_RTX_SECTION
701 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
703 /* Define the strings used for the special svr4 .type and .size directives.
704 These strings generally do not vary from one system running svr4 to
705 another, but if a given system (e.g. m88k running svr) needs to use
706 different pseudo-op names for these, they may be overridden in the
707 file which includes this one. */
709 #define TYPE_ASM_OP ".type"
710 #define SIZE_ASM_OP ".size"
712 /* This is how we tell the assembler that a symbol is weak. */
714 #define ASM_WEAKEN_LABEL(FILE,NAME) \
715 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
716 fputc ('\n', FILE); } while (0)
718 /* The following macro defines the format used to output the second
719 operand of the .type assembler directive. Different svr4 assemblers
720 expect various different forms for this operand. The one given here
721 is just a default. You may need to override it in your machine-
722 specific tm.h file (depending upon the particulars of your assembler). */
724 #define TYPE_OPERAND_FMT "@%s"
726 /* Write the extra assembler code needed to declare a function's result.
727 Most svr4 assemblers don't require any special declaration of the
728 result value, but there are exceptions. */
730 #ifndef ASM_DECLARE_RESULT
731 #define ASM_DECLARE_RESULT(FILE, RESULT)
734 /* These macros generate the special .type and .size directives which
735 are used to set the corresponding fields of the linker symbol table
736 entries in an ELF object file under SVR4. These macros also output
737 the starting labels for the relevant functions/objects. */
739 /* Write the extra assembler code needed to declare a function properly.
740 Some svr4 assemblers need to also have something extra said about the
741 function's return value. We allow for that here. */
743 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
745 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
746 assemble_name (FILE, NAME); \
748 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
750 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
751 ASM_OUTPUT_LABEL(FILE, NAME); \
754 /* Write the extra assembler code needed to declare an object properly. */
756 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
758 fprintf (FILE, "\t%s\t ", TYPE_ASM_OP); \
759 assemble_name (FILE, NAME); \
761 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
763 size_directive_output = 0; \
764 if (!flag_inhibit_size_directive && DECL_SIZE (DECL)) \
766 size_directive_output = 1; \
767 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
768 assemble_name (FILE, NAME); \
769 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
771 ASM_OUTPUT_LABEL(FILE, NAME); \
774 /* Output the size directive for a decl in rest_of_decl_compilation
775 in the case where we did not do so before the initializer.
776 Once we find the error_mark_node, we know that the value of
777 size_directive_output was set
778 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
780 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
782 char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
783 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
784 && ! AT_END && TOP_LEVEL \
785 && DECL_INITIAL (DECL) == error_mark_node \
786 && !size_directive_output) \
788 size_directive_output = 1; \
789 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
790 assemble_name (FILE, name); \
791 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (DECL))); \
795 /* This is how to declare the size of a function. */
797 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
799 if (!flag_inhibit_size_directive) \
802 static int labelno; \
804 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
805 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
806 fprintf (FILE, "\t%s\t ", SIZE_ASM_OP); \
807 assemble_name (FILE, (FNAME)); \
808 fprintf (FILE, ","); \
809 assemble_name (FILE, label); \
810 fprintf (FILE, "-"); \
811 assemble_name (FILE, (FNAME)); \
816 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
817 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
818 corresponds to a particular byte value [0..255]. For any
819 given byte value, if the value in the corresponding table
820 position is zero, the given character can be output directly.
821 If the table value is 1, the byte must be output as a \ooo
822 octal escape. If the tables value is anything else, then the
823 byte value should be output as a \ followed by the value
824 in the table. Note that we can use standard UN*X escape
825 sequences for many control characters, but we don't use
826 \a to represent BEL because some svr4 assemblers (e.g. on
827 the i386) don't know about that. Also, we don't use \v
828 since some versions of gas, such as 2.2 did not accept it. */
831 "\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\
832 \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\
833 \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\
834 \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\
835 \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\
836 \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\
837 \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\
838 \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"
840 /* Some svr4 assemblers have a limit on the number of characters which
841 can appear in the operand of a .string directive. If your assembler
842 has such a limitation, you should define STRING_LIMIT to reflect that
843 limit. Note that at least some svr4 assemblers have a limit on the
844 actual number of bytes in the double-quoted string, and that they
845 count each character in an escape sequence as one byte. Thus, an
846 escape sequence like \377 would count as four bytes.
848 If your target assembler doesn't support the .string directive, you
849 should define this to zero.
852 #define STRING_LIMIT ((unsigned) 256)
854 #define STRING_ASM_OP ".string"
856 /* The routine used to output NUL terminated strings. We use a special
857 version of this for most svr4 targets because doing so makes the
858 generated assembly code more compact (and thus faster to assemble)
859 as well as more readable, especially for targets like the i386
860 (where the only alternative is to output character sequences as
861 comma separated lists of numbers). */
863 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
866 register unsigned char *_limited_str = (unsigned char *) (STR); \
867 register unsigned ch; \
868 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
869 for (; ch = *_limited_str; _limited_str++) \
871 register int escape; \
872 switch (escape = ESCAPES[ch]) \
878 fprintf ((FILE), "\\%03o", ch); \
881 putc ('\\', (FILE)); \
882 putc (escape, (FILE)); \
886 fprintf ((FILE), "\"\n"); \
890 /* The routine used to output sequences of byte values. We use a special
891 version of this for most svr4 targets because doing so makes the
892 generated assembly code more compact (and thus faster to assemble)
893 as well as more readable. Note that if we find subparts of the
894 character sequence which end with NUL (and which are shorter than
895 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
897 #undef ASM_OUTPUT_ASCII
898 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
901 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
902 register unsigned char *limit = _ascii_bytes + (LENGTH); \
903 register unsigned bytes_in_chunk = 0; \
904 for (; _ascii_bytes < limit; _ascii_bytes++) \
906 register unsigned char *p; \
907 if (bytes_in_chunk >= 60) \
909 fprintf ((FILE), "\"\n"); \
910 bytes_in_chunk = 0; \
912 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
914 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
916 if (bytes_in_chunk > 0) \
918 fprintf ((FILE), "\"\n"); \
919 bytes_in_chunk = 0; \
921 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
926 register int escape; \
927 register unsigned ch; \
928 if (bytes_in_chunk == 0) \
929 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
930 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
937 fprintf ((FILE), "\\%03o", ch); \
938 bytes_in_chunk += 4; \
941 putc ('\\', (FILE)); \
942 putc (escape, (FILE)); \
943 bytes_in_chunk += 2; \
948 if (bytes_in_chunk > 0) \
949 fprintf ((FILE), "\"\n"); \
953 /* All SVR4 targets use the ELF object file format. */
954 #define OBJECT_FORMAT_ELF