| 1 | /* svr3.h -- operating system specific defines to be used when |
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| 2 | targeting GCC for some generic System V Release 3 system. |
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| 3 | Copyright (C) 1991 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | Written by Ron Guilmette (rfg@netcom.com). |
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| 6 | |
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| 7 | This file is part of GNU CC. |
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| 8 | |
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| 9 | GNU CC is free software; you can redistribute it and/or modify |
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| 10 | it under the terms of the GNU General Public License as published by |
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| 11 | the Free Software Foundation; either version 2, or (at your option) |
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| 12 | any later version. |
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| 13 | |
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| 14 | GNU CC is distributed in the hope that it will be useful, |
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| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | GNU General Public License for more details. |
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| 18 | |
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| 19 | You should have received a copy of the GNU General Public License |
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| 20 | along with GNU CC; see the file COPYING. If not, write to |
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| 21 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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| 22 | Boston, MA 02111-1307, USA. |
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| 23 | |
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| 24 | To use this file, make up a file with a name like: |
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| 25 | |
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| 26 | ?????svr3.h |
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| 27 | |
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| 28 | where ????? is replaced by the name of the basic hardware that you |
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| 29 | are targeting for. Then, in the file ?????svr3.h, put something |
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| 30 | like: |
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| 31 | |
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| 32 | #include "?????.h" |
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| 33 | #include "svr3.h" |
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| 34 | |
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| 35 | followed by any really system-specific defines (or overrides of |
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| 36 | defines) which you find that you need. For example, CPP_PREDEFINES |
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| 37 | is defined here with only the defined -Dunix and -DSVR3. You should |
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| 38 | probably override that in your target-specific ?????svr3.h file |
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| 39 | with a set of defines that includes these, but also contains an |
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| 40 | appropriate define for the type of hardware that you are targeting. |
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| 41 | */ |
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| 42 | |
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| 43 | /* Define a symbol indicating that we are using svr3.h. */ |
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| 44 | #define USING_SVR3_H |
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| 45 | |
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| 46 | /* Define a symbol so that libgcc* can know what sort of operating |
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| 47 | environment and assembler syntax we are targeting for. */ |
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| 48 | #define SVR3_target |
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| 49 | |
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| 50 | /* Cpp, assembler, linker, library, and startfile spec's. */ |
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| 51 | |
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| 52 | /* You should redefine CPP_PREDEFINES in any file which includes this one. |
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| 53 | The definition should be appropriate for the type of target system |
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| 54 | involved, and it should include any -A (assertion) options which are |
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| 55 | appropriate for the given target system. */ |
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| 56 | |
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| 57 | #undef CPP_PREDEFINES |
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| 58 | |
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| 59 | /* Output at beginning of assembler file. */ |
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| 60 | /* The .file command should always begin the output. */ |
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| 61 | |
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| 62 | #undef ASM_FILE_START |
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| 63 | #define ASM_FILE_START(FILE) \ |
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| 64 | do { output_file_directive ((FILE), main_input_filename); \ |
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| 65 | if (optimize) ASM_FILE_START_1 (FILE); \ |
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| 66 | } while (0) |
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| 67 | |
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| 68 | /* By default, do nothing: a few machines support .optim, but not most. */ |
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| 69 | #undef ASM_FILE_START_1 |
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| 70 | #define ASM_FILE_START_1(FILE) |
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| 71 | |
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| 72 | /* This says how to output an assembler line |
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| 73 | to define a global common symbol. */ |
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| 74 | /* We don't use ROUNDED because the standard compiler doesn't, |
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| 75 | and the linker gives error messages if a common symbol |
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| 76 | has more than one length value. */ |
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| 77 | |
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| 78 | #undef ASM_OUTPUT_COMMON |
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| 79 | #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED) \ |
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| 80 | ( fputs (".comm ", (FILE)), \ |
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| 81 | assemble_name ((FILE), (NAME)), \ |
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| 82 | fprintf ((FILE), ",%u\n", (SIZE))) |
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| 83 | |
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| 84 | /* This says how to output an assembler line |
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| 85 | to define a local common symbol. */ |
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| 86 | |
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| 87 | /* Note that using bss_section here caused errors |
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| 88 | in building shared libraries on system V.3. */ |
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| 89 | #undef ASM_OUTPUT_LOCAL |
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| 90 | #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED) \ |
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| 91 | do { \ |
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| 92 | int align = exact_log2 (ROUNDED); \ |
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| 93 | if (align > 2) align = 2; \ |
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| 94 | data_section (); \ |
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| 95 | ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \ |
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| 96 | ASM_OUTPUT_LABEL ((FILE), (NAME)); \ |
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| 97 | fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED)); \ |
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| 98 | } while (0) |
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| 99 | |
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| 100 | #if 0 /* For now, let's leave these machine-specific. */ |
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| 101 | /* Use crt1.o as a startup file and crtn.o as a closing file. */ |
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| 102 | |
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| 103 | #define STARTFILE_SPEC \ |
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| 104 | "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}" |
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| 105 | |
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| 106 | #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s" |
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| 107 | |
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| 108 | /* Special flags for the linker. I don't know what they do. */ |
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| 109 | |
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| 110 | #define LINK_SPEC "%{T*} %{z:-lm}" |
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| 111 | #endif |
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| 112 | |
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| 113 | /* Allow #sccs in preprocessor. */ |
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| 114 | |
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| 115 | #define SCCS_DIRECTIVE |
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| 116 | |
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| 117 | /* Output #ident as a .ident. */ |
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| 118 | |
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| 119 | #define ASM_OUTPUT_IDENT(FILE, NAME) \ |
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| 120 | fprintf (FILE, "\t.ident \"%s\"\n", NAME); |
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| 121 | |
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| 122 | /* Use periods rather than dollar signs in special g++ assembler names. */ |
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| 123 | |
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| 124 | #define NO_DOLLAR_IN_LABEL |
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| 125 | |
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| 126 | /* Implicit library calls should use memcpy, not bcopy, etc. */ |
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| 127 | |
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| 128 | #define TARGET_MEM_FUNCTIONS |
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| 129 | |
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| 130 | /* System V Release 3 uses COFF debugging info. */ |
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| 131 | |
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| 132 | #define SDB_DEBUGGING_INFO |
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| 133 | |
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| 134 | /* We don't want to output DBX debugging information. */ |
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| 135 | |
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| 136 | #undef DBX_DEBUGGING_INFO |
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| 137 | |
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| 138 | /* Define the actual types of some ANSI-mandated types. These |
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| 139 | definitions should work for most SVR3 systems. */ |
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| 140 | |
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| 141 | #undef SIZE_TYPE |
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| 142 | #define SIZE_TYPE "unsigned int" |
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| 143 | |
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| 144 | #undef PTRDIFF_TYPE |
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| 145 | #define PTRDIFF_TYPE "int" |
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| 146 | |
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| 147 | #undef WCHAR_TYPE |
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| 148 | #define WCHAR_TYPE "long int" |
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| 149 | |
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| 150 | #undef WCHAR_TYPE_SIZE |
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| 151 | #define WCHAR_TYPE_SIZE BITS_PER_WORD |
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| 152 | |
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| 153 | /* Assembler pseudos to introduce constants of various size. These |
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| 154 | definitions should work for most svr3 systems. */ |
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| 155 | |
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| 156 | #undef ASM_BYTE_OP |
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| 157 | #define ASM_BYTE_OP "\t.byte" |
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| 158 | |
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| 159 | /* This is how to output a reference to a user-level label named NAME. |
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| 160 | `assemble_name' uses this. |
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| 161 | |
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| 162 | For System V Release 3 the convention is to prepend a leading |
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| 163 | underscore onto user-level symbol names. */ |
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| 164 | |
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| 165 | #undef ASM_OUTPUT_LABELREF |
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| 166 | #define ASM_OUTPUT_LABELREF(FILE,NAME) fprintf (FILE, "_%s", NAME) |
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| 167 | |
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| 168 | /* This is how to output an internal numbered label where |
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| 169 | PREFIX is the class of label and NUM is the number within the class. |
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| 170 | |
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| 171 | For most svr3 systems, the convention is that any symbol which begins |
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| 172 | with a period is not put into the linker symbol table by the assembler. */ |
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| 173 | |
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| 174 | #undef ASM_OUTPUT_INTERNAL_LABEL |
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| 175 | #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM) \ |
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| 176 | asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM) |
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| 177 | |
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| 178 | /* This is how to store into the string LABEL |
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| 179 | the symbol_ref name of an internal numbered label where |
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| 180 | PREFIX is the class of label and NUM is the number within the class. |
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| 181 | This is suitable for output with `assemble_name'. |
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| 182 | |
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| 183 | For most svr3 systems, the convention is that any symbol which begins |
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| 184 | with a period is not put into the linker symbol table by the assembler. */ |
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| 185 | |
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| 186 | #undef ASM_GENERATE_INTERNAL_LABEL |
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| 187 | #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM) \ |
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| 188 | sprintf (LABEL, "*%s%s%d", LOCAL_LABEL_PREFIX, PREFIX, NUM) |
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| 189 | |
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| 190 | /* We want local labels to start with period if made with asm_fprintf. */ |
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| 191 | #undef LOCAL_LABEL_PREFIX |
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| 192 | #define LOCAL_LABEL_PREFIX "." |
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| 193 | |
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| 194 | /* Support const sections and the ctors and dtors sections for g++. |
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| 195 | Note that there appears to be two different ways to support const |
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| 196 | sections at the moment. You can either #define the symbol |
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| 197 | READONLY_DATA_SECTION (giving it some code which switches to the |
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| 198 | readonly data section) or else you can #define the symbols |
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| 199 | EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and |
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| 200 | SELECT_RTX_SECTION. We do both here just to be on the safe side. |
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| 201 | However, use of the const section is turned off by default |
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| 202 | unless the specific tm.h file turns it on by defining |
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| 203 | USE_CONST_SECTION as 1. */ |
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| 204 | |
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| 205 | /* Define a few machine-specific details of the implementation of |
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| 206 | constructors. |
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| 207 | |
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| 208 | The __CTORS_LIST__ goes in the .init section. Define CTOR_LIST_BEGIN |
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| 209 | and CTOR_LIST_END to contribute to the .init section an instruction to |
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| 210 | push a word containing 0 (or some equivalent of that). |
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| 211 | |
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| 212 | Define ASM_OUTPUT_CONSTRUCTOR to push the address of the constructor. */ |
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| 213 | |
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| 214 | #define USE_CONST_SECTION 0 |
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| 215 | |
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| 216 | #define INIT_SECTION_ASM_OP ".section\t.init" |
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| 217 | #define FINI_SECTION_ASM_OP ".section .fini,\"x\"" |
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| 218 | #define CONST_SECTION_ASM_OP ".section\t.rodata, \"x\"" |
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| 219 | #define CTORS_SECTION_ASM_OP INIT_SECTION_ASM_OP |
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| 220 | #define DTORS_SECTION_ASM_OP FINI_SECTION_ASM_OP |
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| 221 | |
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| 222 | /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent |
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| 223 | because they push on the stack. */ |
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| 224 | |
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| 225 | #ifndef STACK_GROWS_DOWNWARD |
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| 226 | |
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| 227 | /* Constructor list on stack is in reverse order. Go to the end of the |
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| 228 | list and go backwards to call constructors in the right order. */ |
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| 229 | #define DO_GLOBAL_CTORS_BODY \ |
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| 230 | do { \ |
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| 231 | func_ptr *p, *beg = alloca (0); \ |
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| 232 | for (p = beg; *p; p++) \ |
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| 233 | ; \ |
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| 234 | while (p != beg) \ |
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| 235 | (*--p) (); \ |
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| 236 | } while (0) |
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| 237 | |
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| 238 | #else |
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| 239 | |
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| 240 | /* Constructor list on stack is in correct order. Just call them. */ |
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| 241 | #define DO_GLOBAL_CTORS_BODY \ |
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| 242 | do { \ |
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| 243 | func_ptr *p, *beg = alloca (0); \ |
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| 244 | for (p = beg; *p; ) \ |
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| 245 | (*p++) (); \ |
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| 246 | } while (0) |
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| 247 | |
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| 248 | #endif /* STACK_GROWS_DOWNWARD */ |
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| 249 | |
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| 250 | /* Add extra sections .init and .fini, in addition to .bss from att386.h. */ |
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| 251 | |
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| 252 | #undef EXTRA_SECTIONS |
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| 253 | #define EXTRA_SECTIONS in_const, in_bss, in_init, in_fini |
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| 254 | |
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| 255 | #undef EXTRA_SECTION_FUNCTIONS |
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| 256 | #define EXTRA_SECTION_FUNCTIONS \ |
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| 257 | CONST_SECTION_FUNCTION \ |
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| 258 | BSS_SECTION_FUNCTION \ |
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| 259 | INIT_SECTION_FUNCTION \ |
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| 260 | FINI_SECTION_FUNCTION |
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| 261 | |
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| 262 | #define BSS_SECTION_FUNCTION \ |
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| 263 | void \ |
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| 264 | bss_section () \ |
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| 265 | { \ |
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| 266 | if (in_section != in_bss) \ |
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| 267 | { \ |
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| 268 | fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP); \ |
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| 269 | in_section = in_bss; \ |
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| 270 | } \ |
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| 271 | } |
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| 272 | |
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| 273 | #define INIT_SECTION_FUNCTION \ |
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| 274 | void \ |
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| 275 | init_section () \ |
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| 276 | { \ |
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| 277 | if (in_section != in_init) \ |
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| 278 | { \ |
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| 279 | fprintf (asm_out_file, "\t%s\n", INIT_SECTION_ASM_OP); \ |
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| 280 | in_section = in_init; \ |
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| 281 | } \ |
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| 282 | } |
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| 283 | |
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| 284 | #define FINI_SECTION_FUNCTION \ |
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| 285 | void \ |
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| 286 | fini_section () \ |
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| 287 | { \ |
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| 288 | if (in_section != in_fini) \ |
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| 289 | { \ |
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| 290 | fprintf (asm_out_file, "\t%s\n", FINI_SECTION_ASM_OP); \ |
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| 291 | in_section = in_fini; \ |
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| 292 | } \ |
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| 293 | } |
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| 294 | |
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| 295 | #define READONLY_DATA_SECTION() const_section () |
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| 296 | |
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| 297 | #define CONST_SECTION_FUNCTION \ |
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| 298 | void \ |
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| 299 | const_section () \ |
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| 300 | { \ |
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| 301 | extern void text_section(); \ |
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| 302 | if (!USE_CONST_SECTION) \ |
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| 303 | text_section(); \ |
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| 304 | else if (in_section != in_const) \ |
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| 305 | { \ |
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| 306 | fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP); \ |
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| 307 | in_section = in_const; \ |
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| 308 | } \ |
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| 309 | } |
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| 310 | |
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| 311 | /* The ctors and dtors sections are not normally put into use |
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| 312 | by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h, |
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| 313 | but it can't hurt to define these macros for whatever systems use them. */ |
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| 314 | #define CTORS_SECTION_FUNCTION \ |
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| 315 | void \ |
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| 316 | ctors_section () \ |
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| 317 | { \ |
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| 318 | if (in_section != in_ctors) \ |
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| 319 | { \ |
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| 320 | fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP); \ |
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| 321 | in_section = in_ctors; \ |
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| 322 | } \ |
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| 323 | } |
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| 324 | |
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| 325 | #define DTORS_SECTION_FUNCTION \ |
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| 326 | void \ |
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| 327 | dtors_section () \ |
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| 328 | { \ |
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| 329 | if (in_section != in_dtors) \ |
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| 330 | { \ |
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| 331 | fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP); \ |
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| 332 | in_section = in_dtors; \ |
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| 333 | } \ |
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| 334 | } |
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| 335 | |
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| 336 | /* This is machine-dependent |
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| 337 | because it needs to push something on the stack. */ |
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| 338 | #undef ASM_OUTPUT_CONSTRUCTOR |
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| 339 | |
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| 340 | /* A C statement (sans semicolon) to output an element in the table of |
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| 341 | global destructors. */ |
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| 342 | #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME) \ |
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| 343 | do { \ |
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| 344 | fini_section (); \ |
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| 345 | fprintf (FILE, "%s\t ", ASM_LONG); \ |
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| 346 | assemble_name (FILE, NAME); \ |
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| 347 | fprintf (FILE, "\n"); \ |
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| 348 | } while (0) |
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| 349 | |
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| 350 | /* A C statement or statements to switch to the appropriate |
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| 351 | section for output of DECL. DECL is either a `VAR_DECL' node |
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| 352 | or a constant of some sort. RELOC indicates whether forming |
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| 353 | the initial value of DECL requires link-time relocations. */ |
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| 354 | |
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| 355 | #define SELECT_SECTION(DECL,RELOC) \ |
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| 356 | { \ |
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| 357 | if (TREE_CODE (DECL) == STRING_CST) \ |
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| 358 | { \ |
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| 359 | if (! flag_writable_strings) \ |
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| 360 | const_section (); \ |
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| 361 | else \ |
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| 362 | data_section (); \ |
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| 363 | } \ |
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| 364 | else if (TREE_CODE (DECL) == VAR_DECL) \ |
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| 365 | { \ |
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| 366 | if ((0 && RELOC) /* should be (flag_pic && RELOC) */ \ |
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| 367 | || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL) \ |
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| 368 | || !DECL_INITIAL (DECL) \ |
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| 369 | || (DECL_INITIAL (DECL) != error_mark_node \ |
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| 370 | && !TREE_CONSTANT (DECL_INITIAL (DECL)))) \ |
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| 371 | data_section (); \ |
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| 372 | else \ |
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| 373 | const_section (); \ |
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| 374 | } \ |
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| 375 | else \ |
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| 376 | const_section (); \ |
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| 377 | } |
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| 378 | |
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| 379 | /* A C statement or statements to switch to the appropriate |
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| 380 | section for output of RTX in mode MODE. RTX is some kind |
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| 381 | of constant in RTL. The argument MODE is redundant except |
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| 382 | in the case of a `const_int' rtx. Currently, these always |
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| 383 | go into the const section. */ |
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| 384 | |
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| 385 | #define SELECT_RTX_SECTION(MODE,RTX) const_section() |
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