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1.1 root 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.
4:
5: Written by Ron Guilmette ([email protected]).
6:
7: This file is part of GNU CC.
8:
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)
12: any later version.
13:
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.
18:
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.
22:
23: To use this file, make up a file with a name like:
24:
25: ?????svr3.h
26:
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
29: like:
30:
31: #include "?????.h"
32: #include "svr3.h"
33:
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.
40: */
41:
42: /* Define a symbol so that libgcc* can know what sort of operating
43: environment and assembler syntax we are targeting for. */
44: #define SVR3_target
45:
46: /* Cpp, assembler, linker, library, and startfile spec's. */
47:
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. */
52:
53: #undef CPP_PREDEFINES
54:
55: /* Output at beginning of assembler file. */
56: /* The .file command should always begin the output. */
57:
58: #undef ASM_FILE_START
59: #define ASM_FILE_START(FILE) \
60: do { output_file_directive ((FILE), main_input_filename); \
61: if (optimize) ASM_FILE_START_1 (FILE); \
62: } while (0)
63:
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)
67:
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. */
73:
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)))
79:
80: /* This says how to output an assembler line
81: to define a local common symbol. */
82:
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) \
87: do { \
88: int align = exact_log2 (ROUNDED); \
89: if (align > 2) align = 2; \
90: data_section (); \
91: ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
92: ASM_OUTPUT_LABEL ((FILE), (NAME)); \
93: fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
94: } while (0)
95:
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. */
98:
99: #define STARTFILE_SPEC \
100: "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
101:
102: #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
103:
104: /* Special flags for the linker. I don't know what they do. */
105:
106: #define LINK_SPEC "%{T*} %{z:-lm}"
107: #endif
108:
109: /* Allow #sccs in preprocessor. */
110:
111: #define SCCS_DIRECTIVE
112:
113: /* Output #ident as a .ident. */
114:
115: #define ASM_OUTPUT_IDENT(FILE, NAME) \
116: fprintf (FILE, "\t.ident \"%s\"\n", NAME);
117:
118: /* Use periods rather than dollar signs in special g++ assembler names. */
119:
120: #define NO_DOLLAR_IN_LABEL
121:
122: /* Implicit library calls should use memcpy, not bcopy, etc. */
123:
124: #define TARGET_MEM_FUNCTIONS
125:
126: /* System V Release 3 uses COFF debugging info. */
127:
128: #define SDB_DEBUGGING_INFO
129:
130: /* We don't want to output DBX debugging information. */
131:
132: #undef DBX_DEBUGGING_INFO
133:
134: /* Define the actual types of some ANSI-mandated types. These
135: definitions should work for most SVR3 systems. */
136:
137: #undef SIZE_TYPE
138: #define SIZE_TYPE "unsigned int"
139:
140: #undef PTRDIFF_TYPE
141: #define PTRDIFF_TYPE "int"
142:
143: #undef WCHAR_TYPE
144: #define WCHAR_TYPE "long int"
145:
146: #undef WCHAR_TYPE_SIZE
147: #define WCHAR_TYPE_SIZE BITS_PER_WORD
148:
149: /* Assembler pseudos to introduce constants of various size. These
150: definitions hsould work for most svr3 systems. */
151:
152: #undef ASM_BYTE_OP
153: #define ASM_BYTE_OP "\t.byte"
154:
155: /* This is how to output a reference to a user-level label named NAME.
156: `assemble_name' uses this.
157:
158: For System V Release 3 the convention is to prepend a leading
159: underscore onto user-level symbol names. */
160:
161: #undef ASM_OUTPUT_LABELREF
162: #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME)
163:
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. */
174:
175: /* The support for constructors and destructors depends on two
176: machine-specific macros that the individual tm.h file has to define:
177:
178: CTORS_SECTION_ASM_OP should be defined to concatenate
179: the macro INIT_SECTION_ASM_OP, a newline, and a push instruction
180: to push a word containing 0 (or some equivalent of that).
181:
182: ASM_OUTPUT_CONSTRUCTOR should be defined
183: to push the address of the constructor. */
184:
185: #define USE_CONST_SECTION 0
186:
187: #define INIT_SECTION_ASM_OP "\t.section\t.init"
188: #define FINI_SECTION_ASM_OP ".section .fini,\"x\""
189: #define CONST_SECTION_ASM_OP "\t.section\t.rodata, \"x\""
190:
191: #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
192: /* CTORS_SECTION_ASM_OP is machine-dependent
193: because it pushes on the stack. */
194:
195: #define DO_GLOBAL_CTORS_BODY \
196: do { \
197: func_ptr *__CTOR_LIST__ = __builtin_alloca (0), *p; \
198: for (p = __CTOR_LIST__; *p; ) \
199: (*p++) (); \
200: } while (0)
201:
202: /* Add extra sections .init and .fini, in addition to .bss from att386.h. */
203:
204: #undef EXTRA_SECTIONS
205: #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini
206:
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
213:
214: #define INIT_SECTION_FUNCTION \
215: void \
216: init_section () \
217: { \
218: if (in_section != in_init) \
219: { \
220: fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \
221: in_section = in_init; \
222: } \
223: }
224:
225: #define FINI_SECTION_FUNCTION \
226: void \
227: fini_section () \
228: { \
229: if (in_section != in_fini) \
230: { \
231: fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \
232: in_section = in_fini; \
233: } \
234: }
235:
236: #define READONLY_DATA_SECTION() const_section ()
237:
238: #define CONST_SECTION_FUNCTION \
239: void \
240: const_section () \
241: { \
242: extern void text_section(); \
243: if (!USE_CONST_SECTION) \
244: text_section(); \
245: else if (in_section != in_const) \
246: { \
247: fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
248: in_section = in_const; \
249: } \
250: }
251:
252: #if 0
253: #define CTORS_SECTION_FUNCTION \
254: void \
255: ctors_section () \
256: { \
257: if (in_section != in_ctors) \
258: { \
259: fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
260: in_section = in_ctors; \
261: } \
262: }
263:
264: #define DTORS_SECTION_FUNCTION \
265: void \
266: dtors_section () \
267: { \
268: if (in_section != in_dtors) \
269: { \
270: fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
271: in_section = in_dtors; \
272: } \
273: }
274: #endif
275:
276: /* This is machine-dependent
277: because it needs to push something on the stack. */
278: #undef ASM_OUTPUT_CONSTRUCTOR
279:
280: /* A C statement (sans semicolon) to output an element in the table of
281: global destructors. */
282: #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
283: do { \
284: fini_section (); \
285: fprintf (FILE, "%s\t ", ASM_LONG); \
286: assemble_name (FILE, NAME); \
287: fprintf (FILE, "\n"); \
288: } while (0)
289:
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. */
294:
295: #define SELECT_SECTION(DECL,RELOC) \
296: { \
297: if (TREE_CODE (DECL) == STRING_CST) \
298: { \
299: if (! flag_writable_strings) \
300: const_section (); \
301: else \
302: data_section (); \
303: } \
304: else if (TREE_CODE (DECL) == VAR_DECL) \
305: { \
306: if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
307: || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)) \
308: data_section (); \
309: else \
310: const_section (); \
311: } \
312: else \
313: const_section (); \
314: }
315:
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. */
321:
322: #define SELECT_RTX_SECTION(MODE,RTX) const_section()
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