1 /* Definitions for Intel 386 running system V, using gas.
2 Copyright (C) 1992, 1996, 2000 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
23 /* Add stuff that normally comes from i386/sysv3.h */
25 /* longjmp may fail to restore the registers if called from the same
26 function that called setjmp. To compensate, the compiler avoids
27 putting variables in registers in functions that use both setjmp
30 #define NON_SAVING_SETJMP \
31 (current_function_calls_setjmp && current_function_calls_longjmp)
33 /* longjmp may fail to restore the stack pointer if the saved frame
34 pointer is the same as the caller's frame pointer. Requiring a frame
35 pointer in any function that calls setjmp or longjmp avoids this
36 problem, unless setjmp and longjmp are called from the same function.
37 Since a frame pointer will be required in such a function, it is OK
38 that the stack pointer is not restored. */
40 #undef FRAME_POINTER_REQUIRED
41 #define FRAME_POINTER_REQUIRED \
42 (current_function_calls_setjmp || current_function_calls_longjmp)
44 /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib, adapted to gas */
45 #undef ASM_OUTPUT_LOCAL
46 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \
48 int align = exact_log2 (ROUNDED); \
49 if (align > 2) align = 2; \
50 if (TARGET_SVR3_SHLIB) \
53 ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
54 ASM_OUTPUT_LABEL ((FILE), (NAME)); \
55 fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \
59 fputs (".lcomm ", (FILE)); \
60 assemble_name ((FILE), (NAME)); \
61 fprintf ((FILE), ",%u\n", (ROUNDED)); \
65 /* Add stuff that normally comes from i386/sysv3.h via svr3.h */
67 /* Define the actual types of some ANSI-mandated types. These
68 definitions should work for most SVR3 systems. */
71 #define SIZE_TYPE "unsigned int"
74 #define PTRDIFF_TYPE "int"
77 #define WCHAR_TYPE "long int"
79 #undef WCHAR_TYPE_SIZE
80 #define WCHAR_TYPE_SIZE BITS_PER_WORD
82 /* ??? This stuff is copied from config/svr3.h. In the future,
83 this file should be rewritten to include config/svr3.h
84 and override what isn't right. */
86 /* Support const sections and the ctors and dtors sections for g++.
87 Note that there appears to be two different ways to support const
88 sections at the moment. You can either #define the symbol
89 READONLY_DATA_SECTION (giving it some code which switches to the
90 readonly data section) or else you can #define the symbols
91 EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
92 SELECT_RTX_SECTION. We do both here just to be on the safe side.
93 However, use of the const section is turned off by default
94 unless the specific tm.h file turns it on by defining
95 USE_CONST_SECTION as 1. */
97 /* Define a few machine-specific details of the implementation of
100 The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
101 and CTOR_LIST_END to contribute to the .init section an instruction to
102 push a word containing 0 (or some equivalent of that).
104 Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */
106 #define USE_CONST_SECTION 0
108 #define INIT_SECTION_ASM_OP "\t.section\t.init"
109 #define FINI_SECTION_ASM_OP "\t.section .fini,\"x\""
110 #define CONST_SECTION_ASM_OP "\t.section\t.rodata, \"x\""
111 #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
112 #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
114 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
115 because they push on the stack. */
117 #ifdef STACK_GROWS_DOWNWARD
119 /* Constructor list on stack is in reverse order. Go to the end of the
120 list and go backwards to call constructors in the right order. */
121 #define DO_GLOBAL_CTORS_BODY \
123 func_ptr *p, *beg = alloca (0); \
124 for (p = beg; *p; p++) \
132 /* Constructor list on stack is in correct order. Just call them. */
133 #define DO_GLOBAL_CTORS_BODY \
135 func_ptr *p, *beg = alloca (0); \
136 for (p = beg; *p; ) \
140 #endif /* STACK_GROWS_DOWNWARD */
142 /* Add extra sections .rodata, .init and .fini. */
144 #undef EXTRA_SECTIONS
145 #define EXTRA_SECTIONS in_const, in_init, in_fini
147 #undef EXTRA_SECTION_FUNCTIONS
148 #define EXTRA_SECTION_FUNCTIONS \
149 CONST_SECTION_FUNCTION \
150 INIT_SECTION_FUNCTION \
151 FINI_SECTION_FUNCTION
153 #define INIT_SECTION_FUNCTION \
157 if (in_section != in_init) \
159 fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP); \
160 in_section = in_init; \
164 #define FINI_SECTION_FUNCTION \
168 if (in_section != in_fini) \
170 fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP); \
171 in_section = in_fini; \
175 #define READONLY_DATA_SECTION() const_section ()
177 #define CONST_SECTION_FUNCTION \
181 if (!USE_CONST_SECTION) \
183 else if (in_section != in_const) \
185 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
186 in_section = in_const; \
190 /* The ctors and dtors sections are not normally put into use
191 by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
192 but it can't hurt to define these macros for whatever systems use them. */
193 #define CTORS_SECTION_FUNCTION \
197 if (in_section != in_ctors) \
199 fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \
200 in_section = in_ctors; \
204 #define DTORS_SECTION_FUNCTION \
208 if (in_section != in_dtors) \
210 fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \
211 in_section = in_dtors; \
215 /* This is machine-dependent
216 because it needs to push something on the stack. */
217 #undef ASM_OUTPUT_CONSTRUCTOR
219 /* A C statement (sans semicolon) to output an element in the table of
220 global destructors. */
221 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \
224 fprintf (FILE, "%s\t ", ASM_LONG); \
225 assemble_name (FILE, NAME); \
226 fprintf (FILE, "\n"); \
229 /* A C statement or statements to switch to the appropriate
230 section for output of DECL. DECL is either a `VAR_DECL' node
231 or a constant of some sort. RELOC indicates whether forming
232 the initial value of DECL requires link-time relocations. */
234 #define SELECT_SECTION(DECL,RELOC) \
236 if (TREE_CODE (DECL) == STRING_CST) \
238 if (! flag_writable_strings) \
243 else if (TREE_CODE (DECL) == VAR_DECL) \
245 if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
246 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
247 || !DECL_INITIAL (DECL) \
248 || (DECL_INITIAL (DECL) != error_mark_node \
249 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
258 /* A C statement or statements to switch to the appropriate
259 section for output of RTX in mode MODE. RTX is some kind
260 of constant in RTL. The argument MODE is redundant except
261 in the case of a `const_int' rtx. Currently, these always
262 go into the const section. */
264 #define SELECT_RTX_SECTION(MODE,RTX) const_section()
266 /* This is copied from i386/sysv3.h. */
268 /* Define a few machine-specific details of the implementation of
271 The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN
272 and CTOR_LIST_END to contribute to the .init section an instruction to
273 push a word containing 0 (or some equivalent of that).
275 ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the
278 #undef INIT_SECTION_ASM_OP
279 #define INIT_SECTION_ASM_OP "\t.section .init,\"x\""
281 #define CTOR_LIST_BEGIN \
282 asm (INIT_SECTION_ASM_OP); \
284 #define CTOR_LIST_END CTOR_LIST_BEGIN
286 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \
289 fprintf (FILE, "\tpushl $"); \
290 assemble_name (FILE, NAME); \
291 fprintf (FILE, "\n"); \