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 Free Software Foundation, Inc.
4 Based on svr4.h contributed by Ron Guilmette (rfg@netcom.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 /* The prefix to add to user-visible assembler symbols.
25 For ELF systems the convention is *not* to prepend a leading
26 underscore onto user-level symbol names. */
28 #undef USER_LABEL_PREFIX
29 #define USER_LABEL_PREFIX ""
31 /* Biggest alignment supported by the object file format of this
32 machine. Use this macro to limit the alignment which can be
33 specified using the `__attribute__ ((aligned (N)))' construct. If
34 not defined, the default value is `BIGGEST_ALIGNMENT'. */
35 #ifndef MAX_OFILE_ALIGNMENT
36 #define MAX_OFILE_ALIGNMENT (32768 * 8)
40 #define ENDFILE_SPEC "crtend.o%s"
43 #define STARTFILE_SPEC "%{!shared: \
45 %{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}}}\
48 /* Use periods rather than dollar signs in special g++ assembler names. */
50 #define NO_DOLLAR_IN_LABEL
52 /* Writing `int' for a bitfield forces int alignment for the structure. */
54 #define PCC_BITFIELD_TYPE_MATTERS 1
56 /* Implicit library calls should use memcpy, not bcopy, etc. */
58 #define TARGET_MEM_FUNCTIONS
60 /* Handle #pragma weak and #pragma pack. */
62 #define HANDLE_SYSV_PRAGMA
64 /* System V Release 4 uses DWARF debugging info. */
66 #ifndef DWARF_DEBUGGING_INFO
67 #define DWARF_DEBUGGING_INFO 1
70 /* All ELF targets can support DWARF-2. */
72 #ifndef DWARF2_DEBUGGING_INFO
73 #define DWARF2_DEBUGGING_INFO 1
76 /* Also allow them to support STABS debugging. */
80 /* The GNU tools operate better with stabs. Since we don't have
81 any native tools to be compatible with, default to stabs. */
83 #ifndef PREFERRED_DEBUGGING_TYPE
84 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
87 /* All SVR4 targets use the ELF object file format. */
88 #define OBJECT_FORMAT_ELF
91 /* Output #ident as a .ident. */
93 #define ASM_OUTPUT_IDENT(FILE, NAME) \
94 fprintf (FILE, "%s\"%s\"\n", IDENT_ASM_OP, NAME);
96 /* Attach a special .ident directive to the end of the file to identify
97 the version of GCC which compiled this code. The format of the
98 .ident string is patterned after the ones produced by native svr4
101 #define IDENT_ASM_OP "\t.ident\t"
103 #define ASM_FILE_END(FILE) \
106 if (!flag_no_ident) \
107 fprintf ((FILE), "%s\"GCC: (GNU) %s\"\n", \
108 IDENT_ASM_OP, version_string); \
113 #define ASM_BYTE_OP "\t.byte\t"
116 #define SET_ASM_OP "\t.set\t"
118 /* This is how to begin an assembly language file. Most svr4 assemblers want
119 at least a .file directive to come first, and some want to see a .version
120 directive come right after that. Here we just establish a default
121 which generates only the .file directive. If you need a .version
122 directive for any specific target, you should override this definition
123 in the target-specific file which includes this one. */
125 #undef ASM_FILE_START
126 #define ASM_FILE_START(FILE) \
127 output_file_directive ((FILE), main_input_filename)
129 /* This is how to allocate empty space in some section. The .zero
130 pseudo-op is used for this on most svr4 assemblers. */
132 #define SKIP_ASM_OP "\t.zero\t"
134 #undef ASM_OUTPUT_SKIP
135 #define ASM_OUTPUT_SKIP(FILE, SIZE) \
136 fprintf (FILE, "%s%u\n", SKIP_ASM_OP, (SIZE))
138 /* This is how to output an internal numbered label where
139 PREFIX is the class of label and NUM is the number within the class.
141 For most svr4 systems, the convention is that any symbol which begins
142 with a period is not put into the linker symbol table by the assembler. */
144 #undef ASM_OUTPUT_INTERNAL_LABEL
145 #define ASM_OUTPUT_INTERNAL_LABEL(FILE, PREFIX, NUM) \
148 fprintf (FILE, ".%s%d:\n", PREFIX, NUM); \
152 /* This is how to store into the string LABEL
153 the symbol_ref name of an internal numbered label where
154 PREFIX is the class of label and NUM is the number within the class.
155 This is suitable for output with `assemble_name'.
157 For most svr4 systems, the convention is that any symbol which begins
158 with a period is not put into the linker symbol table by the assembler. */
160 #undef ASM_GENERATE_INTERNAL_LABEL
161 #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \
164 sprintf (LABEL, "*.%s%u", PREFIX, (unsigned) (NUM)); \
168 /* Output the label which precedes a jumptable. Note that for all svr4
169 systems where we actually generate jumptables (which is to say every
170 svr4 target except i386, where we use casesi instead) we put the jump-
171 tables into the .rodata section and since other stuff could have been
172 put into the .rodata section prior to any given jumptable, we have to
173 make sure that the location counter for the .rodata section gets pro-
174 perly re-aligned prior to the actual beginning of the jump table. */
176 #define ALIGN_ASM_OP "\t.align\t"
178 #ifndef ASM_OUTPUT_BEFORE_CASE_LABEL
179 #define ASM_OUTPUT_BEFORE_CASE_LABEL(FILE, PREFIX, NUM, TABLE) \
180 ASM_OUTPUT_ALIGN ((FILE), 2);
183 #undef ASM_OUTPUT_CASE_LABEL
184 #define ASM_OUTPUT_CASE_LABEL(FILE, PREFIX, NUM, JUMPTABLE) \
187 ASM_OUTPUT_BEFORE_CASE_LABEL (FILE, PREFIX, NUM, JUMPTABLE) \
188 ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); \
192 /* The standard SVR4 assembler seems to require that certain builtin
193 library routines (e.g. .udiv) be explicitly declared as .globl
194 in each assembly file where they are referenced. */
196 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
197 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
199 /* This says how to output assembler code to declare an
200 uninitialized external linkage data object. Under SVR4,
201 the linker seems to want the alignment of data objects
202 to depend on their types. We do exactly that here. */
204 #define COMMON_ASM_OP "\t.comm\t"
206 #undef ASM_OUTPUT_ALIGNED_COMMON
207 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
210 fprintf ((FILE), "%s", COMMON_ASM_OP); \
211 assemble_name ((FILE), (NAME)); \
212 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
216 /* This says how to output assembler code to declare an
217 uninitialized internal linkage data object. Under SVR4,
218 the linker seems to want the alignment of data objects
219 to depend on their types. We do exactly that here. */
221 #define LOCAL_ASM_OP "\t.local\t"
223 #undef ASM_OUTPUT_ALIGNED_LOCAL
224 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
227 fprintf ((FILE), "%s", LOCAL_ASM_OP); \
228 assemble_name ((FILE), (NAME)); \
229 fprintf ((FILE), "\n"); \
230 ASM_OUTPUT_ALIGNED_COMMON (FILE, NAME, SIZE, ALIGN); \
234 /* This is the pseudo-op used to generate a 32-bit word of data with a
235 specific value in some section. This is the same for all known svr4
238 #define INT_ASM_OP "\t.long\t"
240 /* This is the pseudo-op used to generate a contiguous sequence of byte
241 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
242 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
244 #undef ASCII_DATA_ASM_OP
245 #define ASCII_DATA_ASM_OP "\t.ascii\t"
247 /* Support const sections and the ctors and dtors sections for g++.
248 Note that there appears to be two different ways to support const
249 sections at the moment. You can either #define the symbol
250 READONLY_DATA_SECTION (giving it some code which switches to the
251 readonly data section) or else you can #define the symbols
252 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
253 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
255 #define USE_CONST_SECTION 1
257 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
259 /* Define the pseudo-ops used to switch to the .ctors and .dtors sections.
261 Note that we want to give these sections the SHF_WRITE attribute
262 because these sections will actually contain data (i.e. tables of
263 addresses of functions in the current root executable or shared library
264 file) and, in the case of a shared library, the relocatable addresses
265 will have to be properly resolved/relocated (and then written into) by
266 the dynamic linker when it actually attaches the given shared library
267 to the executing process. (Note that on SVR4, you may wish to use the
268 `-z text' option to the ELF linker, when building a shared library, as
269 an additional check that you are doing everything right. But if you do
270 use the `-z text' option when building a shared library, you will get
271 errors unless the .ctors and .dtors sections are marked as writable
272 via the SHF_WRITE attribute.) */
274 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"aw\""
275 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"aw\""
277 /* On svr4, we *do* have support for the .init and .fini sections, and we
278 can put stuff in there to be executed before and after `main'. We let
279 crtstuff.c and other files know this by defining the following symbols.
280 The definitions say how to change sections to the .init and .fini
281 sections. This is the same for all known svr4 assemblers. */
283 #define INIT_SECTION_ASM_OP "\t.section\t.init"
284 #define FINI_SECTION_ASM_OP "\t.section\t.fini"
286 /* A default list of other sections which we might be "in" at any given
287 time. For targets that use additional sections (e.g. .tdesc) you
288 should override this definition in the target-specific file which
289 includes this file. */
291 #undef EXTRA_SECTIONS
292 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
294 /* A default list of extra section function definitions. For targets
295 that use additional sections (e.g. .tdesc) you should override this
296 definition in the target-specific file which includes this file. */
298 #undef EXTRA_SECTION_FUNCTIONS
299 #define EXTRA_SECTION_FUNCTIONS \
300 CONST_SECTION_FUNCTION \
301 CTORS_SECTION_FUNCTION \
302 DTORS_SECTION_FUNCTION
304 #define READONLY_DATA_SECTION() const_section ()
306 #define CONST_SECTION_FUNCTION \
310 if (!USE_CONST_SECTION) \
312 else if (in_section != in_const) \
314 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
315 in_section = in_const; \
319 #define CTORS_SECTION_FUNCTION \
323 if (in_section != in_ctors) \
325 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
326 in_section = in_ctors; \
330 #define DTORS_SECTION_FUNCTION \
334 if (in_section != in_dtors) \
336 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
337 in_section = in_dtors; \
341 #define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
343 #define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
345 #define UNIQUE_SECTION(DECL, RELOC) \
352 const char *prefix; \
353 static const char *prefixes[/*4*/3][2] = \
355 { ".text.", ".gnu.linkonce.t." }, \
356 { ".rodata.", ".gnu.linkonce.r." }, \
357 { ".data.", ".gnu.linkonce.d." } \
358 /* Do not generate unique sections for uninitialised \
359 data since we do not have support for this in the \
360 linker scripts yet... \
361 ,{ ".bss.", ".gnu.linkonce.b." } */ \
364 if (TREE_CODE (DECL) == FUNCTION_DECL) \
366 /* else if (DECL_INITIAL (DECL) == 0 \
367 || DECL_INITIAL (DECL) == error_mark_node) \
369 else if (DECL_READONLY_SECTION (DECL, RELOC)) \
374 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
375 /* Strip off any encoding in name. */ \
376 STRIP_NAME_ENCODING (name, name); \
377 prefix = prefixes[sec][DECL_ONE_ONLY(DECL)]; \
378 len = strlen (name) + strlen (prefix); \
379 string = alloca (len + 1); \
381 sprintf (string, "%s%s", prefix, name); \
383 DECL_SECTION_NAME (DECL) = build_string (len, string); \
387 /* A C statement (sans semicolon) to output an
388 element in the table of global constructors. */
389 #define ASM_OUTPUT_CONSTRUCTOR(FILE, NAME) \
393 fprintf (FILE, "%s", INT_ASM_OP); \
394 assemble_name (FILE, NAME); \
395 fprintf (FILE, "\n"); \
399 /* A C statement (sans semicolon) to output an
400 element in the table of global destructors. */
401 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
405 fprintf (FILE, "%s", INT_ASM_OP); \
406 assemble_name (FILE, NAME); \
407 fprintf (FILE, "\n"); \
411 /* Switch into a generic section.
413 We make the section read-only and executable for a function decl,
414 read-only for a const data decl, and writable for a non-const data decl.
416 If the section has already been defined, we must not
417 emit the attributes here. The SVR4 assembler does not
418 recognize section redefinitions.
419 If DECL is NULL, no attributes are emitted. */
421 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
424 static htab_t htab; \
426 struct section_info \
428 enum sect_enum {SECT_RW, SECT_RO, SECT_EXEC} type; \
431 struct section_info *s; \
433 enum sect_enum type; \
436 /* The names we put in the hashtable will always be the unique \
437 versions gived to us by the stringtable, so we can just use \
438 their addresses as the keys. */ \
440 htab = htab_create (31, \
445 if (DECL && TREE_CODE (DECL) == FUNCTION_DECL) \
446 type = SECT_EXEC, mode = "ax"; \
447 else if (DECL && DECL_READONLY_SECTION (DECL, RELOC)) \
448 type = SECT_RO, mode = "a"; \
450 type = SECT_RW, mode = "aw"; \
453 /* See if we already have an entry for this section. */ \
454 slot = htab_find_slot (htab, NAME, INSERT); \
457 s = (struct section_info *) xmalloc (sizeof (* s)); \
460 fprintf (FILE, "\t.section\t%s,\"%s\",@progbits\n", \
465 s = (struct section_info *) *slot; \
466 if (DECL && s->type != type) \
467 error_with_decl (DECL, \
468 "%s causes a section type conflict"); \
470 fprintf (FILE, "\t.section\t%s\n", NAME); \
475 /* A C statement or statements to switch to the appropriate
476 section for output of RTX in mode MODE. RTX is some kind
477 of constant in RTL. The argument MODE is redundant except
478 in the case of a `const_int' rtx. Currently, these always
479 go into the const section. */
481 #undef SELECT_RTX_SECTION
482 #define SELECT_RTX_SECTION(MODE, RTX) const_section ()
484 /* A C statement or statements to switch to the appropriate
485 section for output of DECL. DECL is either a `VAR_DECL' node
486 or a constant of some sort. RELOC indicates whether forming
487 the initial value of DECL requires link-time relocations. */
489 #define SELECT_SECTION(DECL, RELOC) \
491 if (TREE_CODE (DECL) == STRING_CST) \
493 if (! flag_writable_strings) \
498 else if (TREE_CODE (DECL) == VAR_DECL) \
500 if ((flag_pic && RELOC) \
501 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
502 || !DECL_INITIAL (DECL) \
503 || (DECL_INITIAL (DECL) != error_mark_node \
504 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
509 else if (TREE_CODE (DECL) == CONSTRUCTOR) \
511 if ((flag_pic && RELOC) \
512 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
513 || ! TREE_CONSTANT (DECL)) \
522 /* Define the strings used for the special svr4 .type and .size directives.
523 These strings generally do not vary from one system running svr4 to
524 another, but if a given system (e.g. m88k running svr) needs to use
525 different pseudo-op names for these, they may be overridden in the
526 file which includes this one. */
528 #define TYPE_ASM_OP "\t.type\t"
529 #define SIZE_ASM_OP "\t.size\t"
531 /* This is how we tell the assembler that a symbol is weak. */
533 #define ASM_WEAKEN_LABEL(FILE, NAME) \
536 fputs ("\t.weak\t", (FILE)); \
537 assemble_name ((FILE), (NAME)); \
538 fputc ('\n', (FILE)); \
542 /* The following macro defines the format used to output the second
543 operand of the .type assembler directive. Different svr4 assemblers
544 expect various different forms for this operand. The one given here
545 is just a default. You may need to override it in your machine-
546 specific tm.h file (depending upon the particulars of your assembler). */
548 #define TYPE_OPERAND_FMT "@%s"
550 /* Write the extra assembler code needed to declare a function's result.
551 Most svr4 assemblers don't require any special declaration of the
552 result value, but there are exceptions. */
554 #ifndef ASM_DECLARE_RESULT
555 #define ASM_DECLARE_RESULT(FILE, RESULT)
558 /* These macros generate the special .type and .size directives which
559 are used to set the corresponding fields of the linker symbol table
560 entries in an ELF object file under SVR4. These macros also output
561 the starting labels for the relevant functions/objects. */
563 /* Write the extra assembler code needed to declare a function properly.
564 Some svr4 assemblers need to also have something extra said about the
565 function's return value. We allow for that here. */
567 #ifndef ASM_DECLARE_FUNCTION_NAME
568 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
571 fprintf (FILE, "%s", TYPE_ASM_OP); \
572 assemble_name (FILE, NAME); \
574 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
577 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
578 ASM_OUTPUT_LABEL(FILE, NAME); \
583 /* Write the extra assembler code needed to declare an object properly. */
585 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
588 fprintf (FILE, "%s", TYPE_ASM_OP); \
589 assemble_name (FILE, NAME); \
591 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
594 size_directive_output = 0; \
596 if (!flag_inhibit_size_directive \
597 && (DECL) && DECL_SIZE (DECL)) \
599 size_directive_output = 1; \
600 fprintf (FILE, "%s", SIZE_ASM_OP); \
601 assemble_name (FILE, NAME); \
603 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
604 int_size_in_bytes (TREE_TYPE (DECL))); \
605 fputc ('\n', FILE); \
608 ASM_OUTPUT_LABEL (FILE, NAME); \
612 /* Output the size directive for a decl in rest_of_decl_compilation
613 in the case where we did not do so before the initializer.
614 Once we find the error_mark_node, we know that the value of
615 size_directive_output was set
616 by ASM_DECLARE_OBJECT_NAME when it was run for the same decl. */
618 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END)\
621 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
623 if (!flag_inhibit_size_directive \
624 && DECL_SIZE (DECL) \
625 && ! AT_END && TOP_LEVEL \
626 && DECL_INITIAL (DECL) == error_mark_node \
627 && !size_directive_output) \
629 size_directive_output = 1; \
630 fprintf (FILE, "%s", SIZE_ASM_OP); \
631 assemble_name (FILE, name); \
633 fprintf (FILE, HOST_WIDE_INT_PRINT_DEC, \
634 int_size_in_bytes (TREE_TYPE (DECL))); \
635 fputc ('\n', FILE); \
640 /* This is how to declare the size of a function. */
641 #ifndef ASM_DECLARE_FUNCTION_SIZE
642 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
645 if (!flag_inhibit_size_directive) \
648 static int labelno; \
652 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
653 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
655 fprintf (FILE, "%s", SIZE_ASM_OP); \
656 assemble_name (FILE, (FNAME)); \
657 fprintf (FILE, ","); \
658 assemble_name (FILE, label); \
659 fprintf (FILE, "-"); \
660 assemble_name (FILE, (FNAME)); \
667 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
668 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
669 corresponds to a particular byte value [0..255]. For any
670 given byte value, if the value in the corresponding table
671 position is zero, the given character can be output directly.
672 If the table value is 1, the byte must be output as a \ooo
673 octal escape. If the tables value is anything else, then the
674 byte value should be output as a \ followed by the value
675 in the table. Note that we can use standard UN*X escape
676 sequences for many control characters, but we don't use
677 \a to represent BEL because some svr4 assemblers (e.g. on
678 the i386) don't know about that. Also, we don't use \v
679 since some versions of gas, such as 2.2 did not accept it. */
682 "\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\
683 \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\
684 \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\
685 \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\
686 \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\
687 \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\
688 \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\
689 \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"
691 /* Some svr4 assemblers have a limit on the number of characters which
692 can appear in the operand of a .string directive. If your assembler
693 has such a limitation, you should define STRING_LIMIT to reflect that
694 limit. Note that at least some svr4 assemblers have a limit on the
695 actual number of bytes in the double-quoted string, and that they
696 count each character in an escape sequence as one byte. Thus, an
697 escape sequence like \377 would count as four bytes.
699 If your target assembler doesn't support the .string directive, you
700 should define this to zero.
703 #define STRING_LIMIT ((unsigned) 256)
705 #define STRING_ASM_OP "\t.string\t"
707 /* The routine used to output NUL terminated strings. We use a special
708 version of this for most svr4 targets because doing so makes the
709 generated assembly code more compact (and thus faster to assemble)
710 as well as more readable, especially for targets like the i386
711 (where the only alternative is to output character sequences as
712 comma separated lists of numbers). */
714 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
717 register const unsigned char *_limited_str = \
718 (const unsigned char *) (STR); \
719 register unsigned ch; \
721 fprintf ((FILE), "%s\"", STRING_ASM_OP); \
723 for (; (ch = *_limited_str); _limited_str++) \
725 register int escape; \
727 switch (escape = ESCAPES[ch]) \
733 fprintf ((FILE), "\\%03o", ch); \
736 putc ('\\', (FILE)); \
737 putc (escape, (FILE)); \
742 fprintf ((FILE), "\"\n"); \
746 /* The routine used to output sequences of byte values. We use a special
747 version of this for most svr4 targets because doing so makes the
748 generated assembly code more compact (and thus faster to assemble)
749 as well as more readable. Note that if we find subparts of the
750 character sequence which end with NUL (and which are shorter than
751 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
753 #undef ASM_OUTPUT_ASCII
754 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
757 register const unsigned char *_ascii_bytes = \
758 (const unsigned char *) (STR); \
759 register const unsigned char *limit = _ascii_bytes + (LENGTH); \
760 register unsigned bytes_in_chunk = 0; \
762 for (; _ascii_bytes < limit; _ascii_bytes++) \
764 register const unsigned char *p; \
766 if (bytes_in_chunk >= 60) \
768 fprintf ((FILE), "\"\n"); \
769 bytes_in_chunk = 0; \
772 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
775 if (p < limit && (p - _ascii_bytes) <= (long)STRING_LIMIT) \
777 if (bytes_in_chunk > 0) \
779 fprintf ((FILE), "\"\n"); \
780 bytes_in_chunk = 0; \
783 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
788 register int escape; \
789 register unsigned ch; \
791 if (bytes_in_chunk == 0) \
792 fprintf ((FILE), "%s\"", ASCII_DATA_ASM_OP); \
794 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
801 fprintf ((FILE), "\\%03o", ch); \
802 bytes_in_chunk += 4; \
805 putc ('\\', (FILE)); \
806 putc (escape, (FILE)); \
807 bytes_in_chunk += 2; \
813 if (bytes_in_chunk > 0) \
814 fprintf ((FILE), "\"\n"); \