1 /* svr4.h -- operating system specific defines to be used when
2 targeting GCC for some generic System V Release 4 system.
3 Copyright (C) 1991 Free Software Foundation, Inc.
5 Written by Ron Guilmette (rfg@ncd.com).
7 This file is part of GNU CC.
9 GNU CC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GNU CC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GNU CC; see the file COPYING. If not, write to
21 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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 so that libgcc* can know what sort of operating
43 environment and assembler syntax we are targeting for. */
48 /* For the sake of libgcc2.c, indicate target supports atexit. */
51 /* Cpp, assembler, linker, library, and startfile spec's. */
53 /* This defines which switch letters take arguments. On svr4, most of
54 the normal cases (defined in gcc.c) apply, and we also have -h* and
55 -z* options (for the linker). Note however that there is no such
56 thing as a -T option for svr4. */
58 #define SWITCH_TAKES_ARG(CHAR) \
71 /* This defines which multi-letter switches take arguments. On svr4,
72 there are no such switches except those implemented by GCC itself. */
74 #define WORD_SWITCH_TAKES_ARG(STR) \
75 (!strcmp (STR, "include") || !strcmp (STR, "imacros"))
77 /* You should redefine CPP_PREDEFINES in any file which includes this one.
78 The definition should be appropriate for the type of target system
79 involved, and it should include any -A (assertion) options which are
80 appropriate for the given target system. */
83 /* Provide an ASM_SPEC appropriate for svr4. Here we try to support as
84 many of the specialized svr4 assembler options as seems reasonable,
85 given that there are certain options which we can't (or shouldn't)
86 support directly due to the fact that they conflict with other options
87 for other svr4 tools (e.g. ld) or with other options for GCC itself.
88 For example, we don't support the -o (output file) or -R (remove
89 input file) options because GCC already handles these things. We
90 also don't support the -m (run m4) option for the assembler because
91 that conflicts with the -m (produce load map) option of the svr4
92 linker. We do however allow passing arbitrary options to the svr4
93 assembler via the -Wa, option.
95 Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
101 "%{V} %{v:%{!V:-V}} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
103 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
104 the -o option (and its argument) for some reason. If we try to put it
105 before the -o option, the assembler will try to read the file named as
106 the output file in the -o option as an input file (after it has already
107 written some stuff to it) and the binary stuff contained therein will
108 cause totally confuse the assembler, resulting in many spurious error
111 #undef ASM_FINAL_SPEC
112 #define ASM_FINAL_SPEC "%{pipe:-}"
114 /* Under svr4, the normal location of the various *crt*.o files is the
115 /usr/ccs/lib directory. */
117 #undef MD_STARTFILE_PREFIX
118 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
120 /* Provide a LIB_SPEC appropriate for svr4. Here we tack on the default
121 standard C library (unless we are building a shared library) followed by
122 our own magical crtend.o file (see crtstuff.c) which provides part of
123 the support for getting C++ file-scope static object constructed before
124 entering `main', followed by the normal svr3/svr4 "finalizer" file,
125 which is either `gcrtn.o' or `crtn.o'. */
129 "%{!shared:%{!symbolic:-lc}} \
131 %{!shared:%{!symbolic:%{pg:gcrtn.o}%{!pg:crtn.o%s}}}"
133 /* Provide a LINK_SPEC appropriate for svr4. Here we provide support
134 for the special GCC options -static, -shared, and -symbolic which
135 allow us to link things in one of these three modes by applying the
136 appropriate combinations of options at link-time. We also provide
137 support here for as many of the other svr4 linker options as seems
138 reasonable, given that some of them conflict with options for other
139 svr4 tools (e.g. the assembler). In particular, we do support the
140 -h*, -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
141 -l*, -o*, -r, -s, -u*, and -L* options are directly supported
142 by gcc.c itself. We don't directly support the -m (generate load
143 map) option because that conflicts with the -m (run m4) option of
144 the svr4 assembler. We also don't directly support the svr4 linker's
145 -I* or -M* options because these conflict with existing GCC options.
146 We do however allow passing arbitrary options to the svr4 linker
147 via the -Wl, option. We don't support the svr4 linker's -a option
148 at all because it is totally useless and because it conflicts with
151 Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
153 When the -G link option is used (-shared and -symbolic) a final link is
157 #define LINK_SPEC "%{h*} %{V} %{v:%{!V:-V}} \
159 %{static:-dn -Bstatic} \
161 %{symbolic:-Bsymbolic -G -dy} \
164 %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
165 %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
168 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o,
169 /usr/ccs/lib/values-Xa.o, or /usr/ccs/lib/values-Xt.o for each final
170 link step (depending upon the other gcc options selected, such as
171 -traditional and -ansi). These files each contain one (initialized)
172 copy of a special variable called `_lib_version'. Each one of these
173 files has `_lib_version' initialized to a different (enum) value.
174 The SVR4 library routines query the value of `_lib_version' at run
175 to decide how they should behave. Specifically, they decide (based
176 upon the value of `_lib_version') if they will act in a strictly ANSI
177 conforming manner or not.
180 #undef STARTFILE_SPEC
181 #define STARTFILE_SPEC "%{!shared: \
183 %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} \
184 %{pg:gcrti.o%s}%{!pg:crti.o%s} \
185 %{ansi:values-Xc.o%s} \
187 %{traditional:values-Xt.o%s} \
188 %{!traditional:values-Xa.o%s}}}} crtbegin.o%s"
190 /* Attach a special .ident directive to the end of the file to identify
191 the version of GCC which compiled this code. The format of the
192 .ident string is patterned after the ones produced by native svr4
195 #define ASM_FILE_END(FILE) \
197 fprintf ((FILE), "\t.ident\t\"GCC: (GNU) %s\"\n", \
201 /* Allow #sccs in preprocessor. */
203 #define SCCS_DIRECTIVE
205 /* Output #ident as a .ident. */
207 #define ASM_OUTPUT_IDENT(FILE, NAME) \
208 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
210 /* Use periods rather than dollar signs in special g++ assembler names. */
212 #define NO_DOLLAR_IN_LABEL
214 /* Writing `int' for a bitfield forces int alignment for the structure. */
216 #define PCC_BITFIELD_TYPE_MATTERS 1
218 /* Implicit library calls should use memcpy, not bcopy, etc. */
220 #define TARGET_MEM_FUNCTIONS
222 /* System V Release 4 uses DWARF debugging info. */
224 #define DWARF_DEBUGGING_INFO
226 /* The numbers used to denote specific machine registers in the System V
227 Release 4 DWARF debugging information are quite likely to be totally
228 different from the numbers used in BSD stabs debugging information
229 for the same kind of target machine. Thus, we undefine the macro
230 DBX_REGISTER_NUMBER here as an extra inducement to get people to
231 provide proper machine-specific definitions of DBX_REGISTER_NUMBER
232 (which is also used to provide DWARF registers numbers in dwarfout.c)
233 in their tm.h files which include this file. */
235 #undef DBX_REGISTER_NUMBER
237 /* Define the actual types of some ANSI-mandated types. (These
238 definitions should work for most SVR4 systems). */
241 #define SIZE_TYPE "unsigned int"
244 #define PTRDIFF_TYPE "int"
247 #define WCHAR_TYPE "long int"
249 #undef WCHAR_TYPE_SIZE
250 #define WCHAR_TYPE_SIZE BITS_PER_WORD
253 #define ASM_BYTE_OP "\t.byte"
255 /* This is how to begin an assembly language file. Most svr4 assemblers want
256 at least a .file directive to come first, and some want to see a .version
257 directive come right after that. Here we just establish a default
258 which generates only the .file directive. If you need a .version
259 directive for any specific target, you should override this definition
260 in the target-specific file which includes this one. */
262 #undef ASM_FILE_START
263 #define ASM_FILE_START(FILE) \
264 output_file_directive ((FILE), main_input_filename)
266 /* This is how to allocate empty space in some section. The .zero
267 pseudo-op is used for this on most svr4 assemblers. */
269 #undef ASM_OUTPUT_SKIP
270 #define ASM_OUTPUT_SKIP(FILE,SIZE) fprintf (FILE, "\t.zero\t%u\n", (SIZE))
272 /* This is how to output a reference to a user-level label named NAME.
273 `assemble_name' uses this.
275 For System V Release 4 the convention is *not* to prepend a leading
276 underscore onto user-level symbol names. */
278 #undef ASM_OUTPUT_LABELREF
279 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "%s", NAME)
281 /* The standard SVR4 assembler seems to require that certain builtin
282 library routines (e.g. .udiv) be explicitly declared as .globl
283 in each assembly file where they are referenced. */
285 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
286 ASM_GLOBALIZE_LABEL (FILE, XSTR (FUN, 0))
288 /* This says how to output assembler code to declare an
289 uninitialized external linkage data object. Under SVR4,
290 the linker seems to want the alignment of data objects
291 to depend on their types. We do exactly that here. */
293 #undef ASM_OUTPUT_ALIGNED_COMMON
294 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN) \
296 fputs ("\t.comm\t", (FILE)); \
297 assemble_name ((FILE), (NAME)); \
298 fprintf ((FILE), ",%u,%u\n", (SIZE), (ALIGN) / BITS_PER_UNIT); \
301 /* This says how to output assembler code to declare an
302 uninitialized internal linkage data object. Under SVR4,
303 the linker seems to want the alignment of data objects
304 to depend on their types. We do exactly that here. */
306 #define BSS_ASM_OP "\t.bss"
308 #undef ASM_OUTPUT_ALIGNED_LOCAL
309 #define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGN) \
311 fprintf ((FILE), "%s\t%s,%u,%u\n", \
312 BSS_ASM_OP, (NAME), (SIZE), (ALIGN) / BITS_PER_UNIT); \
315 /* This is the pseudo-op used to generate a 32-bit word of data with a
316 specific value in some section. This is the same for all known svr4
319 #define INT_ASM_OP "\t.long\t"
321 /* This is the pseudo-op used to generate a contiguous sequence of byte
322 values from a double-quoted string WITHOUT HAVING A TERMINATING NUL
323 AUTOMATICALLY APPENDED. This is the same for most svr4 assemblers. */
325 #undef ASCII_DATA_ASM_OP
326 #define ASCII_DATA_ASM_OP ".ascii"
328 /* Support const sections and the ctors and dtors sections for g++.
329 Note that there appears to be two different ways to support const
330 sections at the moment. You can either #define the symbol
331 READONLY_DATA_SECTION (giving it some code which switches to the
332 readonly data section) or else you can #define the symbols
333 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
334 SELECT_RTX_SECTION. We do both here just to be on the safe side. */
336 #define USE_CONST_SECTION 1
338 #define CONST_SECTION_ASM_OP "\t.section\t.rodata"
339 #define CTORS_SECTION_ASM_OP "\t.section\t.ctors,\"a\",@progbits\n"
340 #define DTORS_SECTION_ASM_OP "\t.section\t.dtors,\"a\",@progbits\n"
342 /* On svr4, we *do* have support for the .init section, and we can put
343 stuff in there to be executed before `main'. We let crtstuff.c and
344 other files know this by defining the following symbol. The definition
345 says how to change sections to the .init section. This is the same
346 for all know svr4 assemblers. */
348 #define INIT_SECTION_ASM_OP "\t.section\t.init"
350 /* A default list of other sections which we might be "in" at any given
351 time. For targets that use additional sections (e.g. .tdesc) you
352 should override this definition in the target-specific file which
353 includes this file. */
355 #undef EXTRA_SECTIONS
356 #define EXTRA_SECTIONS in_const, in_ctors, in_dtors
358 /* A default list of extra section function definitions. For targets
359 that use additional sections (e.g. .tdesc) you should override this
360 definition in the target-specific file which includes this file. */
362 #undef EXTRA_SECTION_FUNCTIONS
363 #define EXTRA_SECTION_FUNCTIONS \
364 CONST_SECTION_FUNCTION \
365 CTORS_SECTION_FUNCTION \
366 DTORS_SECTION_FUNCTION
368 #define READONLY_DATA_SECTION() const_section ()
370 extern void text_section();
372 #define CONST_SECTION_FUNCTION \
376 if (!USE_CONST_SECTION) \
378 else if (in_section != in_const) \
380 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
381 in_section = in_const; \
385 #define CTORS_SECTION_FUNCTION \
389 if (in_section != in_ctors) \
391 fprintf (asm_out_file, CTORS_SECTION_ASM_OP); \
392 in_section = in_ctors; \
396 #define DTORS_SECTION_FUNCTION \
400 if (in_section != in_dtors) \
402 fprintf (asm_out_file, DTORS_SECTION_ASM_OP); \
403 in_section = in_dtors; \
407 /* A C statement (sans semicolon) to output an element in the table of
408 global constructors. */
409 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
412 fprintf (FILE, "%s\t ", INT_ASM_OP); \
413 assemble_name (FILE, NAME); \
414 fprintf (FILE, "\n"); \
417 /* A C statement (sans semicolon) to output an element in the table of
418 global destructors. */
419 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
422 fprintf (FILE, "%s\t ", INT_ASM_OP); \
423 assemble_name (FILE, NAME); \
424 fprintf (FILE, "\n"); \
427 /* A C statement or statements to switch to the appropriate
428 section for output of DECL. DECL is either a `VAR_DECL' node
429 or a constant of some sort. RELOC indicates whether forming
430 the initial value of DECL requires link-time relocations. */
432 #define SELECT_SECTION(DECL,RELOC) \
434 if (TREE_CODE (DECL) == STRING_CST) \
436 if (! flag_writable_strings) \
441 else if (TREE_CODE (DECL) == VAR_DECL) \
443 if ((flag_pic && RELOC) \
444 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
453 /* A C statement or statements to switch to the appropriate
454 section for output of RTX in mode MODE. RTX is some kind
455 of constant in RTL. The argument MODE is redundant except
456 in the case of a `const_int' rtx. Currently, these always
457 go into the const section. */
459 #undef SELECT_RTX_SECTION
460 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
462 /* Define the strings used for the special svr4 .type and .size directives.
463 These strings generally do not vary from one system running svr4 to
464 another, but if a given system (e.g. m88k running svr) needs to use
465 different pseudo-op names for these, they may be overridden in the
466 file which includes this one. */
468 #define TYPE_ASM_OP "\t.type"
469 #define SIZE_ASM_OP "\t.size"
471 /* The following macro defines the format used to output the second
472 operand of the .type assembler directive. Different svr4 assemblers
473 expect various different forms for this operand. The one given here
474 is just a default. You may need to override it in your machine-
475 specific tm.h file (depending upon the particulars of your assembler). */
477 #define TYPE_OPERAND_FMT "@%s"
479 /* These macros generate the special .type and .size directives which
480 are used to set the corresponding fields of the linker symbol table
481 entries in an ELF object file under SVR4. */
483 /* Write the extra assembler code needed to declare a function properly. */
485 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
487 fprintf (FILE, "%s\t ", TYPE_ASM_OP); \
488 assemble_name (FILE, NAME); \
490 fprintf (FILE, TYPE_OPERAND_FMT, "function"); \
492 ASM_OUTPUT_LABEL(FILE, NAME); \
495 /* Write the extra assembler code needed to declare an object properly. */
497 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
499 fprintf (FILE, "%s\t ", TYPE_ASM_OP); \
500 assemble_name (FILE, NAME); \
502 fprintf (FILE, TYPE_OPERAND_FMT, "object"); \
504 if (!flag_inhibit_size_directive) \
506 fprintf (FILE, "%s\t ", SIZE_ASM_OP); \
507 assemble_name (FILE, NAME); \
508 fprintf (FILE, ",%d\n", int_size_in_bytes (TREE_TYPE (decl))); \
510 ASM_OUTPUT_LABEL(FILE, NAME); \
513 /* This is how to declare the size of a function. */
515 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
517 if (!flag_inhibit_size_directive) \
520 static int labelno; \
522 ASM_GENERATE_INTERNAL_LABEL (label, "Lfe", labelno); \
523 ASM_OUTPUT_INTERNAL_LABEL (FILE, "Lfe", labelno); \
524 fprintf (FILE, "%s\t ", SIZE_ASM_OP); \
525 assemble_name (FILE, (FNAME)); \
526 fprintf (FILE, ","); \
527 assemble_name (FILE, label); \
528 fprintf (FILE, "-"); \
529 ASM_OUTPUT_LABELREF (FILE, (FNAME)); \
534 /* A table of bytes codes used by the ASM_OUTPUT_ASCII and
535 ASM_OUTPUT_LIMITED_STRING macros. Each byte in the table
536 corresponds to a particular byte value [0..255]. For any
537 given byte value, if the value in the corresponding table
538 position is zero, the given character can be output directly.
539 If the table value is 1, the byte must be output as a \ooo
540 octal escape. If the tables value is anything else, then the
541 byte value should be output as a \ followed by the value
542 in the table. Note that we can use standard UN*X escape
543 sequences for many control characters, but we don't use
544 \a to represent BEL because some svr4 assemblers (e.g. on
545 the i386) don't know about that. */
548 "\1\1\1\1\1\1\1\1btnvfr\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\
549 \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\
550 \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\
551 \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\
552 \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\
553 \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\
554 \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\
555 \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"
557 /* Some svr4 assemblers have a limit on the number of characters which
558 can appear in the operand of a .string directive. If your assembler
559 has such a limitation, you should define STRING_LIMIT to reflect that
560 limit. Note that at least some svr4 assemblers have a limit on the
561 actual number of bytes in the double-quoted string, and that they
562 count each character in an escape sequence as one byte. Thus, an
563 escape sequence like \377 would count as four bytes.
565 If your target assembler doesn't support the .string directive, you
566 should define this to zero.
569 #define STRING_LIMIT ((unsigned) 256)
571 #define STRING_ASM_OP ".string"
573 /* The routine used to output NUL terminated strings. We use a special
574 version of this for most svr4 targets because doing so makes the
575 generated assembly code more compact (and thus faster to assemble)
576 as well as more readable, especially for targets like the i386
577 (where the only alternative is to output character sequences as
578 comma separated lists of numbers). */
580 #define ASM_OUTPUT_LIMITED_STRING(FILE, STR) \
583 register unsigned char *_limited_str = (unsigned char *) (STR); \
584 register unsigned ch; \
585 fprintf ((FILE), "\t%s\t\"", STRING_ASM_OP); \
586 for (; ch = *_limited_str; _limited_str++) \
588 register int escape; \
589 switch (escape = ESCAPES[ch]) \
595 fprintf ((FILE), "\\%03o", ch); \
598 putc ('\\', (FILE)); \
599 putc (escape, (FILE)); \
603 fprintf ((FILE), "\"\n"); \
607 /* The routine used to output sequences of byte values. We use a special
608 version of this for most svr4 targets because doing so makes the
609 generated assembly code more compact (and thus faster to assemble)
610 as well as more readable. Note that if we find subparts of the
611 character sequence which end with NUL (and which are shorter than
612 STRING_LIMIT) we output those using ASM_OUTPUT_LIMITED_STRING. */
614 #undef ASM_OUTPUT_ASCII
615 #define ASM_OUTPUT_ASCII(FILE, STR, LENGTH) \
618 register unsigned char *_ascii_bytes = (unsigned char *) (STR); \
619 register unsigned char *limit = _ascii_bytes + (LENGTH); \
620 register unsigned bytes_in_chunk = 0; \
621 for (; _ascii_bytes < limit; _ascii_bytes++) \
623 register unsigned char *p; \
624 if (bytes_in_chunk >= 60) \
626 fprintf ((FILE), "\"\n"); \
627 bytes_in_chunk = 0; \
629 for (p = _ascii_bytes; p < limit && *p != '\0'; p++) \
631 if (p < limit && (p - _ascii_bytes) <= STRING_LIMIT) \
633 if (bytes_in_chunk > 0) \
635 fprintf ((FILE), "\"\n"); \
636 bytes_in_chunk = 0; \
638 ASM_OUTPUT_LIMITED_STRING ((FILE), _ascii_bytes); \
643 register int escape; \
644 register unsigned ch; \
645 if (bytes_in_chunk == 0) \
646 fprintf ((FILE), "\t%s\t\"", ASCII_DATA_ASM_OP); \
647 switch (escape = ESCAPES[ch = *_ascii_bytes]) \
654 fprintf ((FILE), "\\%03o", ch); \
655 bytes_in_chunk += 4; \
658 putc ('\\', (FILE)); \
659 putc (escape, (FILE)); \
660 bytes_in_chunk += 2; \
665 if (bytes_in_chunk > 0) \
666 fprintf ((FILE), "\"\n"); \