| 1 | /* Definitions for Intel 386 running system V, using gas. |
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| 2 | Copyright (C) 1992 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of GNU CC. |
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| 5 | |
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| 6 | GNU CC is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | GNU CC is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with GNU CC; see the file COPYING. If not, write to |
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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| 19 | Boston, MA 02111-1307, USA. */ |
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| 20 | |
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| 21 | #include "i386/gas.h" |
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| 22 | |
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| 23 | /* Add stuff that normally comes from i386/sysv3.h */ |
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| 24 | |
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| 25 | /* longjmp may fail to restore the registers if called from the same |
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| 26 | function that called setjmp. To compensate, the compiler avoids |
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| 27 | putting variables in registers in functions that use both setjmp |
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| 28 | and longjmp. */ |
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| 29 | |
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| 30 | #define NON_SAVING_SETJMP \ |
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| 31 | (current_function_calls_setjmp && current_function_calls_longjmp) |
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| 32 | |
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| 33 | /* longjmp may fail to restore the stack pointer if the saved frame |
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| 34 | pointer is the same as the caller's frame pointer. Requiring a frame |
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| 35 | pointer in any function that calls setjmp or longjmp avoids this |
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| 36 | problem, unless setjmp and longjmp are called from the same function. |
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| 37 | Since a frame pointer will be required in such a function, it is OK |
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| 38 | that the stack pointer is not restored. */ |
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| 39 | |
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| 40 | #undef FRAME_POINTER_REQUIRED |
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| 41 | #define FRAME_POINTER_REQUIRED \ |
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| 42 | (current_function_calls_setjmp || current_function_calls_longjmp) |
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| 43 | |
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| 44 | /* Modify ASM_OUTPUT_LOCAL slightly to test -msvr3-shlib, adapted to gas */ |
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| 45 | #undef ASM_OUTPUT_LOCAL |
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| 46 | #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ |
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| 47 | do { \ |
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| 48 | int align = exact_log2 (ROUNDED); \ |
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| 49 | if (align > 2) align = 2; \ |
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| 50 | if (TARGET_SVR3_SHLIB) \ |
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| 51 | { \ |
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| 52 | data_section (); \ |
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| 53 | ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \ |
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| 54 | ASM_OUTPUT_LABEL ((FILE), (NAME)); \ |
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| 55 | fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \ |
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| 56 | } \ |
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| 57 | else \ |
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| 58 | { \ |
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| 59 | fputs (".lcomm ", (FILE)); \ |
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| 60 | assemble_name ((FILE), (NAME)); \ |
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| 61 | fprintf ((FILE), ",%u\n", (ROUNDED)); \ |
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| 62 | } \ |
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| 63 | } while (0) |
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| 64 | |
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| 65 | /* Add stuff that normally comes from i386/sysv3.h via svr3.h */ |
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| 66 | |
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| 67 | /* Define the actual types of some ANSI-mandated types. These |
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| 68 | definitions should work for most SVR3 systems. */ |
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| 69 | |
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| 70 | #undef SIZE_TYPE |
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| 71 | #define SIZE_TYPE "unsigned int" |
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| 72 | |
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| 73 | #undef PTRDIFF_TYPE |
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| 74 | #define PTRDIFF_TYPE "int" |
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| 75 | |
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| 76 | #undef WCHAR_TYPE |
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| 77 | #define WCHAR_TYPE "long int" |
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| 78 | |
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| 79 | #undef WCHAR_TYPE_SIZE |
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| 80 | #define WCHAR_TYPE_SIZE BITS_PER_WORD |
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| 81 | |
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| 82 | /* ??? This stuff is copied from config/svr3.h. In the future, |
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| 83 | this file should be rewritten to include config/svr3.h |
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| 84 | and override what isn't right. */ |
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| 85 | |
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| 86 | /* Support const sections and the ctors and dtors sections for g++. |
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| 87 | Note that there appears to be two different ways to support const |
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| 88 | sections at the moment. You can either #define the symbol |
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| 89 | READONLY_DATA_SECTION (giving it some code which switches to the |
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| 90 | readonly data section) or else you can #define the symbols |
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| 91 | EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and |
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| 92 | SELECT_RTX_SECTION. We do both here just to be on the safe side. |
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| 93 | However, use of the const section is turned off by default |
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| 94 | unless the specific tm.h file turns it on by defining |
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| 95 | USE_CONST_SECTION as 1. */ |
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| 96 | |
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| 97 | /* Define a few machine-specific details of the implementation of |
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| 98 | constructors. |
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| 99 | |
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| 100 | The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN |
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| 101 | and CTOR_LIST_END to contribute to the .init section an instruction to |
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| 102 | push a word containing 0 (or some equivalent of that). |
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| 103 | |
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| 104 | Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */ |
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| 105 | |
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| 106 | #define USE_CONST_SECTION 0 |
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| 107 | |
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| 108 | #define INIT_SECTION_ASM_OP ".section\t.init" |
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| 109 | #define FINI_SECTION_ASM_OP ".section .fini,\"x\"" |
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| 110 | #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\"" |
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| 111 | #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP |
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| 112 | #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP |
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| 113 | |
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| 114 | /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent |
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| 115 | because they push on the stack. */ |
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| 116 | |
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| 117 | #ifdef STACK_GROWS_DOWNWARD |
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| 118 | |
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| 119 | /* Constructor list on stack is in reverse order. Go to the end of the |
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| 120 | list and go backwards to call constructors in the right order. */ |
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| 121 | #define DO_GLOBAL_CTORS_BODY \ |
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| 122 | do { \ |
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| 123 | func_ptr *p, *beg = alloca (0); \ |
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| 124 | for (p = beg; *p; p++) \ |
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| 125 | ; \ |
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| 126 | while (p != beg) \ |
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| 127 | (*--p) (); \ |
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| 128 | } while (0) |
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| 129 | |
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| 130 | #else |
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| 131 | |
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| 132 | /* Constructor list on stack is in correct order. Just call them. */ |
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| 133 | #define DO_GLOBAL_CTORS_BODY \ |
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| 134 | do { \ |
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| 135 | func_ptr *p, *beg = alloca (0); \ |
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| 136 | for (p = beg; *p; ) \ |
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| 137 | (*p++) (); \ |
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| 138 | } while (0) |
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| 139 | |
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| 140 | #endif /* STACK_GROWS_DOWNWARD */ |
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| 141 | |
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| 142 | /* Add extra sections .init and .fini, in addition to .bss from att386.h. */ |
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| 143 | |
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| 144 | #undef EXTRA_SECTIONS |
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| 145 | #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini |
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| 146 | |
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| 147 | #undef EXTRA_SECTION_FUNCTIONS |
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| 148 | #define EXTRA_SECTION_FUNCTIONS \ |
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| 149 | CONST_SECTION_FUNCTION \ |
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| 150 | BSS_SECTION_FUNCTION \ |
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| 151 | INIT_SECTION_FUNCTION \ |
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| 152 | FINI_SECTION_FUNCTION |
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| 153 | |
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| 154 | #define BSS_SECTION_FUNCTION \ |
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| 155 | void \ |
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| 156 | bss_section () \ |
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| 157 | { \ |
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| 158 | if (in_section != in_bss) \ |
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| 159 | { \ |
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| 160 | fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP); \ |
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| 161 | in_section = in_bss; \ |
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| 162 | } \ |
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| 163 | } |
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| 164 | |
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| 165 | #define INIT_SECTION_FUNCTION \ |
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| 166 | void \ |
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| 167 | init_section () \ |
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| 168 | { \ |
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| 169 | if (in_section != in_init) \ |
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| 170 | { \ |
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| 171 | fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \ |
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| 172 | in_section = in_init; \ |
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| 173 | } \ |
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| 174 | } |
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| 175 | |
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| 176 | #define FINI_SECTION_FUNCTION \ |
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| 177 | void \ |
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| 178 | fini_section () \ |
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| 179 | { \ |
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| 180 | if (in_section != in_fini) \ |
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| 181 | { \ |
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| 182 | fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \ |
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| 183 | in_section = in_fini; \ |
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| 184 | } \ |
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| 185 | } |
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| 186 | |
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| 187 | #define READONLY_DATA_SECTION() const_section () |
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| 188 | |
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| 189 | #define CONST_SECTION_FUNCTION \ |
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| 190 | void \ |
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| 191 | const_section () \ |
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| 192 | { \ |
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| 193 | extern void text_section(); \ |
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| 194 | if (!USE_CONST_SECTION) \ |
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| 195 | text_section(); \ |
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| 196 | else if (in_section != in_const) \ |
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| 197 | { \ |
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| 198 | fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \ |
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| 199 | in_section = in_const; \ |
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| 200 | } \ |
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| 201 | } |
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| 202 | |
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| 203 | /* The ctors and dtors sections are not normally put into use |
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| 204 | by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h, |
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| 205 | but it can't hurt to define these macros for whatever systems use them. */ |
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| 206 | #define CTORS_SECTION_FUNCTION \ |
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| 207 | void \ |
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| 208 | ctors_section () \ |
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| 209 | { \ |
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| 210 | if (in_section != in_ctors) \ |
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| 211 | { \ |
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| 212 | fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ |
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| 213 | in_section = in_ctors; \ |
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| 214 | } \ |
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| 215 | } |
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| 216 | |
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| 217 | #define DTORS_SECTION_FUNCTION \ |
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| 218 | void \ |
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| 219 | dtors_section () \ |
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| 220 | { \ |
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| 221 | if (in_section != in_dtors) \ |
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| 222 | { \ |
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| 223 | fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ |
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| 224 | in_section = in_dtors; \ |
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| 225 | } \ |
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| 226 | } |
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| 227 | |
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| 228 | /* This is machine-dependent |
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| 229 | because it needs to push something on the stack. */ |
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| 230 | #undef ASM_OUTPUT_CONSTRUCTOR |
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| 231 | |
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| 232 | /* A C statement (sans semicolon) to output an element in the table of |
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| 233 | global destructors. */ |
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| 234 | #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \ |
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| 235 | do { \ |
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| 236 | fini_section (); \ |
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| 237 | fprintf (FILE, "%s\t ", ASM_LONG); \ |
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| 238 | assemble_name (FILE, NAME); \ |
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| 239 | fprintf (FILE, "\n"); \ |
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| 240 | } while (0) |
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| 241 | |
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| 242 | /* A C statement or statements to switch to the appropriate |
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| 243 | section for output of DECL. DECL is either a `VAR_DECL' node |
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| 244 | or a constant of some sort. RELOC indicates whether forming |
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| 245 | the initial value of DECL requires link-time relocations. */ |
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| 246 | |
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| 247 | #define SELECT_SECTION(DECL,RELOC) \ |
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| 248 | { \ |
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| 249 | if (TREE_CODE (DECL) == STRING_CST) \ |
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| 250 | { \ |
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| 251 | if (! flag_writable_strings) \ |
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| 252 | const_section (); \ |
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| 253 | else \ |
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| 254 | data_section (); \ |
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| 255 | } \ |
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| 256 | else if (TREE_CODE (DECL) == VAR_DECL) \ |
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| 257 | { \ |
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| 258 | if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \ |
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| 259 | || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \ |
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| 260 | || !DECL_INITIAL (DECL) \ |
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| 261 | || (DECL_INITIAL (DECL) != error_mark_node \ |
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| 262 | && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \ |
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| 263 | data_section (); \ |
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| 264 | else \ |
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| 265 | const_section (); \ |
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| 266 | } \ |
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| 267 | else \ |
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| 268 | const_section (); \ |
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| 269 | } |
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| 270 | |
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| 271 | /* A C statement or statements to switch to the appropriate |
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| 272 | section for output of RTX in mode MODE. RTX is some kind |
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| 273 | of constant in RTL. The argument MODE is redundant except |
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| 274 | in the case of a `const_int' rtx. Currently, these always |
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| 275 | go into the const section. */ |
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| 276 | |
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| 277 | #define SELECT_RTX_SECTION(MODE,RTX) const_section() |
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| 278 | |
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| 279 | /* This is copied from i386/sysv3.h. */ |
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| 280 | |
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| 281 | /* Define a few machine-specific details of the implementation of |
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| 282 | constructors. |
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| 283 | |
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| 284 | The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN |
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| 285 | and CTOR_LIST_END to contribute to the .init section an instruction to |
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| 286 | push a word containing 0 (or some equivalent of that). |
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| 287 | |
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| 288 | ASM_OUTPUT_CONSTRUCTOR should be defined to push the address of the |
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| 289 | constructor. */ |
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| 290 | |
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| 291 | #undef INIT_SECTION_ASM_OP |
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| 292 | #define INIT_SECTION_ASM_OP ".section .init,\"x\"" |
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| 293 | |
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| 294 | #define CTOR_LIST_BEGIN \ |
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| 295 | asm (INIT_SECTION_ASM_OP); \ |
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| 296 | asm ("pushl $0") |
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| 297 | #define CTOR_LIST_END CTOR_LIST_BEGIN |
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| 298 | |
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| 299 | #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME) \ |
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| 300 | do { \ |
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| 301 | init_section (); \ |
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| 302 | fprintf (FILE, "\tpushl $"); \ |
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| 303 | assemble_name (FILE, NAME); \ |
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| 304 | fprintf (FILE, "\n"); \ |
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| 305 | } while (0) |
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