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@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 ?????svr3.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 -DSVR3. You should
37 probably override that in your target-specific ?????svr3.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 svr3.h. */
45 /* Define a symbol so that libgcc* can know what sort of operating
46 environment and assembler syntax we are targeting for. */
49 /* Cpp, assembler, linker, library, and startfile spec's. */
51 /* You should redefine CPP_PREDEFINES in any file which includes this one.
52 The definition should be appropriate for the type of target system
53 involved, and it should include any -A (assertion) options which are
54 appropriate for the given target system. */
58 /* Output at beginning of assembler file. */
59 /* The .file command should always begin the output. */
62 #define ASM_FILE_START(FILE) \
63 do { output_file_directive ((FILE), main_input_filename); \
64 if (optimize) ASM_FILE_START_1 (FILE); \
67 /* By default, do nothing: a few machines support .optim, but not most. */
68 #undef ASM_FILE_START_1
69 #define ASM_FILE_START_1(FILE)
71 /* This says how to output an assembler line
72 to define a global common symbol. */
73 /* We don't use ROUNDED because the standard compiler doesn't,
74 and the linker gives error messages if a common symbol
75 has more than one length value. */
77 #undef ASM_OUTPUT_COMMON
78 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
79 ( fputs (".comm ", (FILE)), \
80 assemble_name ((FILE), (NAME)), \
81 fprintf ((FILE), ",%u\n", (SIZE)))
83 /* This says how to output an assembler line
84 to define a local common symbol. */
86 /* Note that using bss_section here caused errors
87 in building shared libraries on system V.3. */
88 #undef ASM_OUTPUT_LOCAL
89 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
91 int align = exact_log2 (ROUNDED); \
92 if (align > 2) align = 2; \
94 ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
95 ASM_OUTPUT_LABEL ((FILE), (NAME)); \
96 fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
99 #if 0 /* For now, let's leave these machine-specific. */
100 /* Use crt1.o as a startup file and crtn.o as a closing file. */
102 #define STARTFILE_SPEC \
103 "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
105 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
107 /* Special flags for the linker. I don't know what they do. */
109 #define LINK_SPEC "%{T*} %{z:-lm}"
112 /* Allow #sccs in preprocessor. */
114 #define SCCS_DIRECTIVE
116 /* Output #ident as a .ident. */
118 #define ASM_OUTPUT_IDENT(FILE, NAME) \
119 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
121 /* Use periods rather than dollar signs in special g++ assembler names. */
123 #define NO_DOLLAR_IN_LABEL
125 /* Implicit library calls should use memcpy, not bcopy, etc. */
127 #define TARGET_MEM_FUNCTIONS
129 /* System V Release 3 uses COFF debugging info. */
131 #define SDB_DEBUGGING_INFO
133 /* We don't want to output DBX debugging information. */
135 #undef DBX_DEBUGGING_INFO
137 /* Define the actual types of some ANSI-mandated types. These
138 definitions should work for most SVR3 systems. */
141 #define SIZE_TYPE "unsigned int"
144 #define PTRDIFF_TYPE "int"
147 #define WCHAR_TYPE "long int"
149 #undef WCHAR_TYPE_SIZE
150 #define WCHAR_TYPE_SIZE BITS_PER_WORD
152 /* Assembler pseudos to introduce constants of various size. These
153 definitions hsould work for most svr3 systems. */
156 #define ASM_BYTE_OP "\t.byte"
158 /* This is how to output a reference to a user-level label named NAME.
159 `assemble_name' uses this.
161 For System V Release 3 the convention is to prepend a leading
162 underscore onto user-level symbol names. */
164 #undef ASM_OUTPUT_LABELREF
165 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME)
167 /* This is how to output an internal numbered label where
168 PREFIX is the class of label and NUM is the number within the class.
170 For most svr3 systems, the convention is that any symbol which begins
171 with a period is not put into the linker symbol table by the assembler. */
173 #undef ASM_OUTPUT_INTERNAL_LABEL
174 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \
175 asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM)
177 /* This is how to store into the string LABEL
178 the symbol_ref name of an internal numbered label where
179 PREFIX is the class of label and NUM is the number within the class.
180 This is suitable for output with `assemble_name'.
182 For most svr3 systems, the convention is that any symbol which begins
183 with a period is not put into the linker symbol table by the assembler. */
185 #undef ASM_GENERATE_INTERNAL_LABEL
186 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \
187 sprintf (LABEL, "*%s%s%d", LOCAL_LABEL_PREFIX, PREFIX, NUM)
189 /* We want local labels to start with period if made with asm_fprintf. */
190 #undef LOCAL_LABEL_PREFIX
191 #define LOCAL_LABEL_PREFIX "."
193 /* Support const sections and the ctors and dtors sections for g++.
194 Note that there appears to be two different ways to support const
195 sections at the moment. You can either #define the symbol
196 READONLY_DATA_SECTION (giving it some code which switches to the
197 readonly data section) or else you can #define the symbols
198 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
199 SELECT_RTX_SECTION. We do both here just to be on the safe side.
200 However, use of the const section is turned off by default
201 unless the specific tm.h file turns it on by defining
202 USE_CONST_SECTION as 1. */
204 /* Define a few machine-specific details of the implementation of
207 The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
208 and CTOR_LIST_END to contribute to the .init section an instruction to
209 push a word containing 0 (or some equivalent of that).
211 Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
213 #define USE_CONST_SECTION 0
215 #define INIT_SECTION_ASM_OP ".section\t.init"
216 #define FINI_SECTION_ASM_OP ".section .fini,\"x\""
217 #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\""
218 #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
219 #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
221 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
222 because they push on the stack. */
224 #ifdef STACK_GROWS_DOWNWARD
226 /* Constructor list on stack is in reverse order. Go to the end of the
227 list and go backwards to call constructors in the right order. */
228 #define DO_GLOBAL_CTORS_BODY \
230 func_ptr *p, *beg = alloca (0); \
231 for (p = beg; *p; p++) \
239 /* Constructor list on stack is in correct order. Just call them. */
240 #define DO_GLOBAL_CTORS_BODY \
242 func_ptr *p, *beg = alloca (0); \
243 for (p = beg; *p; ) \
247 #endif /* STACK_GROWS_DOWNWARD */
249 /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
251 #undef EXTRA_SECTIONS
252 #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
254 #undef EXTRA_SECTION_FUNCTIONS
255 #define EXTRA_SECTION_FUNCTIONS \
256 CONST_SECTION_FUNCTION \
257 BSS_SECTION_FUNCTION \
258 INIT_SECTION_FUNCTION \
259 FINI_SECTION_FUNCTION
261 #define BSS_SECTION_FUNCTION \
265 if (in_section != in_bss) \
267 fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP); \
268 in_section = in_bss; \
272 #define INIT_SECTION_FUNCTION \
276 if (in_section != in_init) \
278 fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
279 in_section = in_init; \
283 #define FINI_SECTION_FUNCTION \
287 if (in_section != in_fini) \
289 fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
290 in_section = in_fini; \
294 #define READONLY_DATA_SECTION() const_section ()
296 #define CONST_SECTION_FUNCTION \
300 extern void text_section(); \
301 if (!USE_CONST_SECTION) \
303 else if (in_section != in_const) \
305 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
306 in_section = in_const; \
310 /* The ctors and dtors sections are not normally put into use
311 by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
312 but it can't hurt to define these macros for whatever systems use them. */
313 #define CTORS_SECTION_FUNCTION \
317 if (in_section != in_ctors) \
319 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
320 in_section = in_ctors; \
324 #define DTORS_SECTION_FUNCTION \
328 if (in_section != in_dtors) \
330 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
331 in_section = in_dtors; \
335 /* This is machine-dependent
336 because it needs to push something on the stack. */
337 #undef ASM_OUTPUT_CONSTRUCTOR
339 /* A C statement (sans semicolon) to output an element in the table of
340 global destructors. */
341 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
344 fprintf (FILE, "%s\t ", ASM_LONG); \
345 assemble_name (FILE, NAME); \
346 fprintf (FILE, "\n"); \
349 /* A C statement or statements to switch to the appropriate
350 section for output of DECL. DECL is either a `VAR_DECL' node
351 or a constant of some sort. RELOC indicates whether forming
352 the initial value of DECL requires link-time relocations. */
354 #define SELECT_SECTION(DECL,RELOC) \
356 if (TREE_CODE (DECL) == STRING_CST) \
358 if (! flag_writable_strings) \
363 else if (TREE_CODE (DECL) == VAR_DECL) \
365 if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
366 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
375 /* A C statement or statements to switch to the appropriate
376 section for output of RTX in mode MODE. RTX is some kind
377 of constant in RTL. The argument MODE is redundant except
378 in the case of a `const_int' rtx. Currently, these always
379 go into the const section. */
381 #define SELECT_RTX_SECTION(MODE,RTX) const_section()