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 SUBTARGET_FRAME_POINTER_REQUIRED
41 #define SUBTARGET_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 USE_CONST_SECTION 0
99 #define INIT_SECTION_ASM_OP "\t.section\t.init"
100 #define FINI_SECTION_ASM_OP "\t.section .fini,\"x\""
101 #define CONST_SECTION_ASM_OP "\t.section\t.rodata, \"x\""
102 #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP
103 #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP
105 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
106 because they push on the stack. */
107 /* This is copied from i386/sysv3.h. */
109 #define CTOR_LIST_BEGIN \
110 asm (INIT_SECTION_ASM_OP); \
112 #define CTOR_LIST_END CTOR_LIST_BEGIN
114 /* Constructor list on stack is in reverse order. Go to the end of the
115 list and go backwards to call constructors in the right order. */
116 #define DO_GLOBAL_CTORS_BODY \
118 func_ptr *p, *beg = alloca (0); \
119 for (p = beg; *p; p++) \
125 /* Add extra sections .rodata, .init and .fini. */
127 #undef EXTRA_SECTIONS
128 #define EXTRA_SECTIONS in_const, in_init, in_fini
130 #undef EXTRA_SECTION_FUNCTIONS
131 #define EXTRA_SECTION_FUNCTIONS \
132 CONST_SECTION_FUNCTION \
133 INIT_SECTION_FUNCTION \
134 FINI_SECTION_FUNCTION
136 #define INIT_SECTION_FUNCTION \
140 if (in_section != in_init) \
142 fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP); \
143 in_section = in_init; \
147 #define FINI_SECTION_FUNCTION \
151 if (in_section != in_fini) \
153 fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP); \
154 in_section = in_fini; \
158 #define READONLY_DATA_SECTION() const_section ()
160 #define CONST_SECTION_FUNCTION \
164 if (!USE_CONST_SECTION) \
166 else if (in_section != in_const) \
168 fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \
169 in_section = in_const; \
173 #define TARGET_ASM_CONSTRUCTOR ix86_svr3_asm_out_constructor
175 /* A C statement or statements to switch to the appropriate
176 section for output of DECL. DECL is either a `VAR_DECL' node
177 or a constant of some sort. RELOC indicates whether forming
178 the initial value of DECL requires link-time relocations. */
180 #define SELECT_SECTION(DECL,RELOC,ALIGN) \
182 if (TREE_CODE (DECL) == STRING_CST) \
184 if (! flag_writable_strings) \
189 else if (TREE_CODE (DECL) == VAR_DECL) \
191 if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \
192 || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \
193 || !DECL_INITIAL (DECL) \
194 || (DECL_INITIAL (DECL) != error_mark_node \
195 && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \
204 /* A C statement or statements to switch to the appropriate
205 section for output of RTX in mode MODE. RTX is some kind
206 of constant in RTL. The argument MODE is redundant except
207 in the case of a `const_int' rtx. Currently, these always
208 go into the const section. */
210 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN) const_section()