gcc/config/svr3.h

   1 /* Operating system specific defines to be used when targeting GCC for
   2    generic System V Release 3 system.
   3    Copyright (C) 1991, 1996, 2000, 2002 Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com).
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, 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 indicating that we are using svr3.h.  */
  43 #define USING_SVR3_H
  44
  45 /* Define a symbol so that libgcc* can know what sort of operating
  46    environment and assembler syntax we are targeting for.  */
  47 #define SVR3_target
  48
  49 /* Cpp, assembler, linker, library, and startfile spec's.  */
  50
  51 /* You should redefine CPP_PREDEFINES in any file which includes this one.
  52    The definition should be appropriate for the type of target system
  53    involved, and it should include any -A (assertion) options which are
  54    appropriate for the given target system.  */
  55
  56 #undef CPP_PREDEFINES
  57
  58 /* Output at beginning of assembler file.  */
  59 /* The .file command should always begin the output.  */
  60
  61 #undef ASM_FILE_START
  62 #define ASM_FILE_START(FILE)                                    \
  63   do { output_file_directive ((FILE), main_input_filename);     \
  64        if (optimize) { ASM_FILE_START_1 (FILE); }               \
  65      } while (0)
  66
  67 /* By default, do nothing: a few machines support .optim, but not most.  */
  68 #undef ASM_FILE_START_1
  69 #define ASM_FILE_START_1(FILE)
  70
  71 /* This says how to output an assembler line
  72    to define a global common symbol.  */
  73 /* We don't use ROUNDED because the standard compiler doesn't,
  74    and the linker gives error messages if a common symbol
  75    has more than one length value.  */
  76
  77 #undef ASM_OUTPUT_COMMON
  78 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
  79 ( fputs (".comm ", (FILE)),                     \
  80   assemble_name ((FILE), (NAME)),               \
  81   fprintf ((FILE), ",%u\n", (SIZE)))
  82
  83 /* This says how to output an assembler line
  84    to define a local common symbol.  */
  85
  86 /* Note that using bss_section here caused errors
  87    in building shared libraries on system V.3.  */
  88 #undef ASM_OUTPUT_LOCAL
  89 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  90   do {                                                  \
  91     int align = exact_log2 (ROUNDED);                   \
  92     if (align > 2) align = 2;                           \
  93     data_section ();                                    \
  94     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  95     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
  96     fprintf ((FILE), "\t.set .,.+%u\n", (ROUNDED));     \
  97   } while (0)
  98
  99 #if 0 /* For now, let's leave these machine-specific.  */
 100 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
 101
 102 #define STARTFILE_SPEC  \
 103   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
 104
 105 #ifdef CROSS_COMPILE
 106 #define LIB_SPEC "-lc crtn.o%s"
 107 #else
 108 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
 109 #endif
 110
 111 /* Special flags for the linker.  I don't know what they do.  */
 112
 113 #define LINK_SPEC "%{T*} %{z:-lm}"
 114 #endif
 115
 116 /* Output #ident as a .ident.  */
 117
 118 #undef  ASM_OUTPUT_IDENT
 119 #define ASM_OUTPUT_IDENT(FILE, NAME) \
 120   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
 121
 122 /* Use periods rather than dollar signs in special g++ assembler names.  */
 123
 124 #define NO_DOLLAR_IN_LABEL
 125
 126 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 127
 128 #define TARGET_MEM_FUNCTIONS
 129
 130 /* System V Release 3 uses COFF debugging info.  */
 131
 132 #define SDB_DEBUGGING_INFO 1
 133
 134 /* We don't want to output DBX debugging information.  */
 135
 136 #undef DBX_DEBUGGING_INFO
 137
 138 /* Define the actual types of some ANSI-mandated types.  These
 139    definitions should work for most SVR3 systems.  */
 140
 141 #undef SIZE_TYPE
 142 #define SIZE_TYPE "unsigned int"
 143
 144 #undef PTRDIFF_TYPE
 145 #define PTRDIFF_TYPE "int"
 146
 147 #undef WCHAR_TYPE
 148 #define WCHAR_TYPE "long int"
 149
 150 #undef WCHAR_TYPE_SIZE
 151 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 152
 153 /* The prefix to add to user-visible assembler symbols.
 154
 155    For System V Release 3 the convention is to prepend a leading
 156    underscore onto user-level symbol names.  */
 157
 158 #undef USER_LABEL_PREFIX
 159 #define USER_LABEL_PREFIX "_"
 160
 161 /* This is how to store into the string LABEL
 162    the symbol_ref name of an internal numbered label where
 163    PREFIX is the class of label and NUM is the number within the class.
 164    This is suitable for output with `assemble_name'.
 165
 166    For most svr3 systems, the convention is that any symbol which begins
 167    with a period is not put into the linker symbol table by the assembler.  */
 168
 169 #undef ASM_GENERATE_INTERNAL_LABEL
 170 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 171   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 172
 173 /* We want local labels to start with period if made with asm_fprintf.  */
 174 #undef LOCAL_LABEL_PREFIX
 175 #define LOCAL_LABEL_PREFIX "."
 176
 177 /* Support const sections and the ctors and dtors sections for g++.  */
 178
 179 /* Define a few machine-specific details of the implementation of
 180    constructors.
 181
 182    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 183    and CTOR_LIST_END to contribute to the .init section an instruction to
 184    push a word containing 0 (or some equivalent of that).
 185
 186    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 187
 188 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 189 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 190 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 191
 192 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 193    because they push on the stack.  */
 194
 195 #ifndef STACK_GROWS_DOWNWARD
 196
 197 /* Constructor list on stack is in reverse order.  Go to the end of the
 198    list and go backwards to call constructors in the right order.  */
 199 #define DO_GLOBAL_CTORS_BODY                                    \
 200 do {                                                            \
 201   func_ptr *p, *beg = alloca (0);                               \
 202   for (p = beg; *p; p++)                                        \
 203     ;                                                           \
 204   while (p != beg)                                              \
 205     (*--p) ();                                                  \
 206 } while (0)
 207
 208 #else
 209
 210 /* Constructor list on stack is in correct order.  Just call them.  */
 211 #define DO_GLOBAL_CTORS_BODY                                    \
 212 do {                                                            \
 213   func_ptr *p, *beg = alloca (0);                               \
 214   for (p = beg; *p; )                                           \
 215     (*p++) ();                                                  \
 216 } while (0)
 217
 218 #endif /* STACK_GROWS_DOWNWARD */
 219
 220 #undef EXTRA_SECTIONS
 221 #define EXTRA_SECTIONS in_init, in_fini
 222
 223 #undef EXTRA_SECTION_FUNCTIONS
 224 #define EXTRA_SECTION_FUNCTIONS                                 \
 225   INIT_SECTION_FUNCTION                                         \
 226   FINI_SECTION_FUNCTION
 227
 228 #define INIT_SECTION_FUNCTION                                   \
 229 void                                                            \
 230 init_section ()                                                 \
 231 {                                                               \
 232   if (in_section != in_init)                                    \
 233     {                                                           \
 234       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 235       in_section = in_init;                                     \
 236     }                                                           \
 237 }
 238
 239 #define FINI_SECTION_FUNCTION                                   \
 240 void                                                            \
 241 fini_section ()                                                 \
 242 {                                                               \
 243   if (in_section != in_fini)                                    \
 244     {                                                           \
 245       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 246       in_section = in_fini;                                     \
 247     }                                                           \
 248 }