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 so that libgcc* can know what sort of operating
43 environment and assembler syntax we are targeting for. */
46 /* Cpp, assembler, linker, library, and startfile spec's. */
48 /* You should redefine CPP_PREDEFINES in any file which includes this one.
49 The definition should be appropriate for the type of target system
50 involved, and it should include any -A (assertion) options which are
51 appropriate for the given target system. */
55 /* Output at beginning of assembler file. */
56 /* The .file command should always begin the output. */
59 #define ASM_FILE_START(FILE) \
60 do { output_file_directive ((FILE), main_input_filename); \
61 if (optimize) ASM_FILE_START_1 (FILE); \
64 /* By default, do nothing: a few machines support .optim, but not most. */
65 #undef ASM_FILE_START_1
66 #define ASM_FILE_START_1(FILE)
68 /* This says how to output an assembler line
69 to define a global common symbol. */
70 /* We don't use ROUNDED because the standard compiler doesn't,
71 and the linker gives error messages if a common symbol
72 has more than one length value. */
74 #undef ASM_OUTPUT_COMMON
75 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \
76 ( fputs (".comm ", (FILE)), \
77 assemble_name ((FILE), (NAME)), \
78 fprintf ((FILE), ",%u\n", (SIZE)))
80 /* This says how to output an assembler line
81 to define a local common symbol. */
83 /* Note that using bss_section here caused errors
84 in building shared libraries on system V.3. */
85 #undef ASM_OUTPUT_LOCAL
86 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
88 int align = exact_log2 (ROUNDED); \
89 if (align > 2) align = 2; \
91 ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
92 ASM_OUTPUT_LABEL ((FILE), (NAME)); \
93 fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
96 #if 0 /* For now, let's leave these machine-specific. */
97 /* Use crt1.o as a startup file and crtn.o as a closing file. */
99 #define STARTFILE_SPEC \
100 "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
102 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
104 /* Special flags for the linker. I don't know what they do. */
106 #define LINK_SPEC "%{T*} %{z:-lm}"
109 /* Allow #sccs in preprocessor. */
111 #define SCCS_DIRECTIVE
113 /* Output #ident as a .ident. */
115 #define ASM_OUTPUT_IDENT(FILE, NAME) \
116 fprintf (FILE, "\t.ident \"%s\"\n", NAME);
118 /* Use periods rather than dollar signs in special g++ assembler names. */
120 #define NO_DOLLAR_IN_LABEL
122 /* Implicit library calls should use memcpy, not bcopy, etc. */
124 #define TARGET_MEM_FUNCTIONS
126 /* System V Release 3 uses COFF debugging info. */
128 #define SDB_DEBUGGING_INFO
130 /* We don't want to output DBX debugging information. */
132 #undef DBX_DEBUGGING_INFO
134 /* Define the actual types of some ANSI-mandated types. These
135 definitions should work for most SVR3 systems. */
138 #define SIZE_TYPE "unsigned int"
141 #define PTRDIFF_TYPE "int"
144 #define WCHAR_TYPE "long int"
146 #undef WCHAR_TYPE_SIZE
147 #define WCHAR_TYPE_SIZE BITS_PER_WORD
149 /* Assembler pseudos to introduce constants of various size. These
150 definitions hsould work for most svr3 systems. */
153 #define ASM_BYTE_OP "\t.byte"
155 /* This is how to output a reference to a user-level label named NAME.
156 `assemble_name' uses this.
158 For System V Release 3 the convention is to prepend a leading
159 underscore onto user-level symbol names. */
161 #undef ASM_OUTPUT_LABELREF
162 #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME)
164 /* Support const sections and the ctors and dtors sections for g++.
165 Note that there appears to be two different ways to support const
166 sections at the moment. You can either #define the symbol
167 READONLY_DATA_SECTION (giving it some code which switches to the
168 readonly data section) or else you can #define the symbols
169 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
170 SELECT_RTX_SECTION. We do both here just to be on the safe side.
171 However, use of the const section is turned off by default
172 unless the specific tm.h file turns it on by defining
173 USE_CONST_SECTION as 1. */
175 /* Define a few machine-specific details of the implementation of
178 The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
179 and CTOR_LIST_END to contribute to the .init section an instruction to
180 push a word containing 0 (or some equivalent of that).
182 Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
184 #define USE_CONST_SECTION 0
186 #define INIT_SECTION_ASM_OP ".section\t.init"
187 #define FINI_SECTION_ASM_OP ".section .fini,\"x\""
188 #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\""
189 #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
190 #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
192 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
193 because they push on the stack. */
195 #define DO_GLOBAL_CTORS_BODY \
197 func_ptr *__CTOR_LIST__ = __builtin_alloca (0), *p; \
198 for (p = __CTOR_LIST__; *p; ) \
202 /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
204 #undef EXTRA_SECTIONS
205 #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
207 #undef EXTRA_SECTION_FUNCTIONS
208 #define EXTRA_SECTION_FUNCTIONS \
209 CONST_SECTION_FUNCTION \
210 BSS_SECTION_FUNCTION \
211 INIT_SECTION_FUNCTION \
212 FINI_SECTION_FUNCTION
214 #define INIT_SECTION_FUNCTION \
218 if (in_section != in_init) \
220 fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
221 in_section = in_init; \
225 #define FINI_SECTION_FUNCTION \
229 if (in_section != in_fini) \
231 fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
232 in_section = in_fini; \
236 #define READONLY_DATA_SECTION() const_section ()
238 #define CONST_SECTION_FUNCTION \
242 extern void text_section(); \
243 if (!USE_CONST_SECTION) \
245 else if (in_section != in_const) \
247 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
248 in_section = in_const; \
253 #define CTORS_SECTION_FUNCTION \
257 if (in_section != in_ctors) \
259 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
260 in_section = in_ctors; \
264 #define DTORS_SECTION_FUNCTION \
268 if (in_section != in_dtors) \
270 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
271 in_section = in_dtors; \
276 /* This is machine-dependent
277 because it needs to push something on the stack. */
278 #undef ASM_OUTPUT_CONSTRUCTOR
280 /* A C statement (sans semicolon) to output an element in the table of
281 global destructors. */
282 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
285 fprintf (FILE, "%s\t ", ASM_LONG); \
286 assemble_name (FILE, NAME); \
287 fprintf (FILE, "\n"); \
290 /* A C statement or statements to switch to the appropriate
291 section for output of DECL. DECL is either a `VAR_DECL' node
292 or a constant of some sort. RELOC indicates whether forming
293 the initial value of DECL requires link-time relocations. */
295 #define SELECT_SECTION(DECL,RELOC) \
297 if (TREE_CODE (DECL) == STRING_CST) \
299 if (! flag_writable_strings) \
304 else if (TREE_CODE (DECL) == VAR_DECL) \
306 if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
307 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
316 /* A C statement or statements to switch to the appropriate
317 section for output of RTX in mode MODE. RTX is some kind
318 of constant in RTL. The argument MODE is redundant except
319 in the case of a `const_int' rtx. Currently, these always
320 go into the const section. */
322 #define SELECT_RTX_SECTION(MODE,RTX) const_section()