1 /* svr3.h -- operating system specific defines to be used when
2 targeting GCC for some generic System V Release 3 system.
3 Copyright (C) 1991 Free Software Foundation, Inc.
5 Written by Ron Guilmette (rfg@netcom.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, 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA.
24 To use this file, make up a file with a name like:
28 where ????? is replaced by the name of the basic hardware that you
29 are targeting for. Then, in the file ?????svr3.h, put something
35 followed by any really system-specific defines (or overrides of
36 defines) which you find that you need. For example, CPP_PREDEFINES
37 is defined here with only the defined -Dunix and -DSVR3. You should
38 probably override that in your target-specific ?????svr3.h file
39 with a set of defines that includes these, but also contains an
40 appropriate define for the type of hardware that you are targeting.
43 /* Define a symbol indicating that we are using svr3.h. */
46 /* Define a symbol so that libgcc* can know what sort of operating
47 environment and assembler syntax we are targeting for. */
50 /* Cpp, assembler, linker, library, and startfile spec's. */
52 /* You should redefine CPP_PREDEFINES in any file which includes this one.
53 The definition should be appropriate for the type of target system
54 involved, and it should include any -A (assertion) options which are
55 appropriate for the given target system. */
59 /* Output at beginning of assembler file. */
60 /* The .file command should always begin the output. */
63 #define ASM_FILE_START(FILE) \
64 do { output_file_directive ((FILE), main_input_filename); \
65 if (optimize) ASM_FILE_START_1 (FILE); \
68 /* By default, do nothing: a few machines support .optim, but not most. */
69 #undef ASM_FILE_START_1
70 #define ASM_FILE_START_1(FILE)
72 /* This says how to output an assembler line
73 to define a global common symbol. */
74 /* We don't use ROUNDED because the standard compiler doesn't,
75 and the linker gives error messages if a common symbol
76 has more than one length value. */
78 #undef ASM_OUTPUT_COMMON
79 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
80 ( fputs (".comm ", (FILE)), \
81 assemble_name ((FILE), (NAME)), \
82 fprintf ((FILE), ",%u\n", (SIZE)))
84 /* This says how to output an assembler line
85 to define a local common symbol. */
87 /* Note that using bss_section here caused errors
88 in building shared libraries on system V.3. */
89 #undef ASM_OUTPUT_LOCAL
90 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
92 int align = exact_log2 (ROUNDED); \
93 if (align > 2) align = 2; \
95 ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
96 ASM_OUTPUT_LABEL ((FILE), (NAME)); \
97 fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
100 #if 0 /* For now, let's leave these machine-specific. */
101 /* Use crt1.o as a startup file and crtn.o as a closing file. */
103 #define STARTFILE_SPEC \
104 "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
106 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
108 /* Special flags for the linker. I don't know what they do. */
110 #define LINK_SPEC "%{T*} %{z:-lm}"
113 /* Allow #sccs in preprocessor. */
115 #define SCCS_DIRECTIVE
117 /* Output #ident as a .ident. */
119 #define ASM_OUTPUT_IDENT(FILE, NAME) \
120 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
122 /* Use periods rather than dollar signs in special g++ assembler names. */
124 #define NO_DOLLAR_IN_LABEL
126 /* Implicit library calls should use memcpy, not bcopy, etc. */
128 #define TARGET_MEM_FUNCTIONS
130 /* System V Release 3 uses COFF debugging info. */
132 #define SDB_DEBUGGING_INFO
134 /* We don't want to output DBX debugging information. */
136 #undef DBX_DEBUGGING_INFO
138 /* Define the actual types of some ANSI-mandated types. These
139 definitions should work for most SVR3 systems. */
142 #define SIZE_TYPE "unsigned int"
145 #define PTRDIFF_TYPE "int"
148 #define WCHAR_TYPE "long int"
150 #undef WCHAR_TYPE_SIZE
151 #define WCHAR_TYPE_SIZE BITS_PER_WORD
153 /* Assembler pseudos to introduce constants of various size. These
154 definitions should work for most svr3 systems. */
157 #define ASM_BYTE_OP "\t.byte"
159 /* This is how to output a reference to a user-level label named NAME.
160 `assemble_name' uses this.
162 For System V Release 3 the convention is to prepend a leading
163 underscore onto user-level symbol names. */
165 #undef ASM_OUTPUT_LABELREF
166 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME)
168 /* This is how to output an internal numbered label where
169 PREFIX is the class of label and NUM is the number within the class.
171 For most svr3 systems, the convention is that any symbol which begins
172 with a period is not put into the linker symbol table by the assembler. */
174 #undef ASM_OUTPUT_INTERNAL_LABEL
175 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
176 asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM)
178 /* This is how to store into the string LABEL
179 the symbol_ref name of an internal numbered label where
180 PREFIX is the class of label and NUM is the number within the class.
181 This is suitable for output with `assemble_name'.
183 For most svr3 systems, the convention is that any symbol which begins
184 with a period is not put into the linker symbol table by the assembler. */
186 #undef ASM_GENERATE_INTERNAL_LABEL
187 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
188 sprintf (LABEL, "*%s%s%d", LOCAL_LABEL_PREFIX, PREFIX, NUM)
190 /* We want local labels to start with period if made with asm_fprintf. */
191 #undef LOCAL_LABEL_PREFIX
192 #define LOCAL_LABEL_PREFIX "."
194 /* Support const sections and the ctors and dtors sections for g++.
195 Note that there appears to be two different ways to support const
196 sections at the moment. You can either #define the symbol
197 READONLY_DATA_SECTION (giving it some code which switches to the
198 readonly data section) or else you can #define the symbols
199 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
200 SELECT_RTX_SECTION. We do both here just to be on the safe side.
201 However, use of the const section is turned off by default
202 unless the specific tm.h file turns it on by defining
203 USE_CONST_SECTION as 1. */
205 /* Define a few machine-specific details of the implementation of
208 The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
209 and CTOR_LIST_END to contribute to the .init section an instruction to
210 push a word containing 0 (or some equivalent of that).
212 Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
214 #define USE_CONST_SECTION 0
216 #define INIT_SECTION_ASM_OP ".section\t.init"
217 #define FINI_SECTION_ASM_OP ".section .fini,\"x\""
218 #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\""
219 #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
220 #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
222 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
223 because they push on the stack. */
225 #ifndef STACK_GROWS_DOWNWARD
227 /* Constructor list on stack is in reverse order. Go to the end of the
228 list and go backwards to call constructors in the right order. */
229 #define DO_GLOBAL_CTORS_BODY \
231 func_ptr *p, *beg = alloca (0); \
232 for (p = beg; *p; p++) \
240 /* Constructor list on stack is in correct order. Just call them. */
241 #define DO_GLOBAL_CTORS_BODY \
243 func_ptr *p, *beg = alloca (0); \
244 for (p = beg; *p; ) \
248 #endif /* STACK_GROWS_DOWNWARD */
250 /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
252 #undef EXTRA_SECTIONS
253 #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
255 #undef EXTRA_SECTION_FUNCTIONS
256 #define EXTRA_SECTION_FUNCTIONS \
257 CONST_SECTION_FUNCTION \
258 BSS_SECTION_FUNCTION \
259 INIT_SECTION_FUNCTION \
260 FINI_SECTION_FUNCTION
262 #define BSS_SECTION_FUNCTION \
266 if (in_section != in_bss) \
268 fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP); \
269 in_section = in_bss; \
273 #define INIT_SECTION_FUNCTION \
277 if (in_section != in_init) \
279 fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
280 in_section = in_init; \
284 #define FINI_SECTION_FUNCTION \
288 if (in_section != in_fini) \
290 fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
291 in_section = in_fini; \
295 #define READONLY_DATA_SECTION() const_section ()
297 #define CONST_SECTION_FUNCTION \
301 extern void text_section(); \
302 if (!USE_CONST_SECTION) \
304 else if (in_section != in_const) \
306 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
307 in_section = in_const; \
311 /* The ctors and dtors sections are not normally put into use
312 by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
313 but it can't hurt to define these macros for whatever systems use them. */
314 #define CTORS_SECTION_FUNCTION \
318 if (in_section != in_ctors) \
320 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
321 in_section = in_ctors; \
325 #define DTORS_SECTION_FUNCTION \
329 if (in_section != in_dtors) \
331 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
332 in_section = in_dtors; \
336 /* This is machine-dependent
337 because it needs to push something on the stack. */
338 #undef ASM_OUTPUT_CONSTRUCTOR
340 /* A C statement (sans semicolon) to output an element in the table of
341 global destructors. */
342 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
345 fprintf (FILE, "%s\t ", ASM_LONG); \
346 assemble_name (FILE, NAME); \
347 fprintf (FILE, "\n"); \
350 /* A C statement or statements to switch to the appropriate
351 section for output of DECL. DECL is either a `VAR_DECL' node
352 or a constant of some sort. RELOC indicates whether forming
353 the initial value of DECL requires link-time relocations. */
355 #define SELECT_SECTION(DECL,RELOC) \
357 if (TREE_CODE (DECL) == STRING_CST) \
359 if (! flag_writable_strings) \
364 else if (TREE_CODE (DECL) == VAR_DECL) \
366 if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
367 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
368 || !DECL_INITIAL (DECL) \
369 || (DECL_INITIAL (DECL) != error_mark_node \
370 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
379 /* A C statement or statements to switch to the appropriate
380 section for output of RTX in mode MODE. RTX is some kind
381 of constant in RTL. The argument MODE is redundant except
382 in the case of a `const_int' rtx. Currently, these always
383 go into the const section. */
385 #define SELECT_RTX_SECTION(MODE,RTX) const_section()