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 output an internal numbered label where
 162    PREFIX is the class of label and NUM is the number within the class.
 163
 164    For most svr3 systems, the convention is that any symbol which begins
 165    with a period is not put into the linker symbol table by the assembler.  */
 166
 167 #undef ASM_OUTPUT_INTERNAL_LABEL
 168 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)      \
 169   asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM)
 170
 171 /* This is how to store into the string LABEL
 172    the symbol_ref name of an internal numbered label where
 173    PREFIX is the class of label and NUM is the number within the class.
 174    This is suitable for output with `assemble_name'.
 175
 176    For most svr3 systems, the convention is that any symbol which begins
 177    with a period is not put into the linker symbol table by the assembler.  */
 178
 179 #undef ASM_GENERATE_INTERNAL_LABEL
 180 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 181   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 182
 183 /* We want local labels to start with period if made with asm_fprintf.  */
 184 #undef LOCAL_LABEL_PREFIX
 185 #define LOCAL_LABEL_PREFIX "."
 186
 187 /* Support const sections and the ctors and dtors sections for g++.  */
 188
 189 /* Define a few machine-specific details of the implementation of
 190    constructors.
 191
 192    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 193    and CTOR_LIST_END to contribute to the .init section an instruction to
 194    push a word containing 0 (or some equivalent of that).
 195
 196    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 197
 198 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 199 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 200 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 201
 202 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 203    because they push on the stack.  */
 204
 205 #ifndef STACK_GROWS_DOWNWARD
 206
 207 /* Constructor list on stack is in reverse order.  Go to the end of the
 208    list and go backwards to call constructors in the right order.  */
 209 #define DO_GLOBAL_CTORS_BODY                                    \
 210 do {                                                            \
 211   func_ptr *p, *beg = alloca (0);                               \
 212   for (p = beg; *p; p++)                                        \
 213     ;                                                           \
 214   while (p != beg)                                              \
 215     (*--p) ();                                                  \
 216 } while (0)
 217
 218 #else
 219
 220 /* Constructor list on stack is in correct order.  Just call them.  */
 221 #define DO_GLOBAL_CTORS_BODY                                    \
 222 do {                                                            \
 223   func_ptr *p, *beg = alloca (0);                               \
 224   for (p = beg; *p; )                                           \
 225     (*p++) ();                                                  \
 226 } while (0)
 227
 228 #endif /* STACK_GROWS_DOWNWARD */
 229
 230 #undef EXTRA_SECTIONS
 231 #define EXTRA_SECTIONS in_init, in_fini
 232
 233 #undef EXTRA_SECTION_FUNCTIONS
 234 #define EXTRA_SECTION_FUNCTIONS                                 \
 235   INIT_SECTION_FUNCTION                                         \
 236   FINI_SECTION_FUNCTION
 237
 238 #define INIT_SECTION_FUNCTION                                   \
 239 void                                                            \
 240 init_section ()                                                 \
 241 {                                                               \
 242   if (in_section != in_init)                                    \
 243     {                                                           \
 244       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 245       in_section = in_init;                                     \
 246     }                                                           \
 247 }
 248
 249 #define FINI_SECTION_FUNCTION                                   \
 250 void                                                            \
 251 fini_section ()                                                 \
 252 {                                                               \
 253   if (in_section != in_fini)                                    \
 254     {                                                           \
 255       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 256       in_section = in_fini;                                     \
 257     }                                                           \
 258 }