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, 2004 Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com).
   5
   6 This file is part of GCC.
   7
   8 GCC 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 GCC 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 GCC; 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 /* Define a symbol indicating that we are using svr3.h.  */
  24 #define USING_SVR3_H
  25
  26 /* Define a symbol so that libgcc* can know what sort of operating
  27    environment and assembler syntax we are targeting for.  */
  28 #define SVR3_target
  29
  30 /* Assembler, linker, library, and startfile spec's.  */
  31
  32 /* The .file command should always begin the output.  */
  33 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
  34
  35 /* This says how to output an assembler line
  36    to define a global common symbol.  */
  37 /* We don't use ROUNDED because the standard compiler doesn't,
  38    and the linker gives error messages if a common symbol
  39    has more than one length value.  */
  40
  41 #undef ASM_OUTPUT_COMMON
  42 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
  43 ( fputs (".comm ", (FILE)),                     \
  44   assemble_name ((FILE), (NAME)),               \
  45   fprintf ((FILE), ",%lu\n", (unsigned long)(SIZE)))
  46
  47 /* This says how to output an assembler line
  48    to define a local common symbol.  */
  49
  50 /* Note that using bss_section here caused errors
  51    in building shared libraries on system V.3.  */
  52 #undef ASM_OUTPUT_LOCAL
  53 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  54   do {                                                  \
  55     int align = exact_log2 (ROUNDED);                   \
  56     if (align > 2) align = 2;                           \
  57     data_section ();                                    \
  58     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  59     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
  60     fprintf ((FILE), "\t.set .,.+%u\n", (int)(ROUNDED));        \
  61   } while (0)
  62
  63 /* Output #ident as a .ident.  */
  64
  65 #undef  ASM_OUTPUT_IDENT
  66 #define ASM_OUTPUT_IDENT(FILE, NAME) \
  67   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
  68
  69 /* Use periods rather than dollar signs in special g++ assembler names.  */
  70
  71 #define NO_DOLLAR_IN_LABEL
  72
  73 /* System V Release 3 uses COFF debugging info.  */
  74
  75 #define SDB_DEBUGGING_INFO 1
  76
  77 /* We don't want to output DBX debugging information.  */
  78
  79 #undef DBX_DEBUGGING_INFO
  80
  81 /* Define the actual types of some ANSI-mandated types.  These
  82    definitions should work for most SVR3 systems.  */
  83
  84 #undef SIZE_TYPE
  85 #define SIZE_TYPE "unsigned int"
  86
  87 #undef PTRDIFF_TYPE
  88 #define PTRDIFF_TYPE "int"
  89
  90 #undef WCHAR_TYPE
  91 #define WCHAR_TYPE "long int"
  92
  93 #undef WCHAR_TYPE_SIZE
  94 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  95
  96 /* The prefix to add to user-visible assembler symbols.
  97
  98    For System V Release 3 the convention is to prepend a leading
  99    underscore onto user-level symbol names.  */
 100
 101 #undef USER_LABEL_PREFIX
 102 #define USER_LABEL_PREFIX "_"
 103
 104 /* This is how to store into the string LABEL
 105    the symbol_ref name of an internal numbered label where
 106    PREFIX is the class of label and NUM is the number within the class.
 107    This is suitable for output with `assemble_name'.
 108
 109    For most svr3 systems, the convention is that any symbol which begins
 110    with a period is not put into the linker symbol table by the assembler.  */
 111
 112 #undef ASM_GENERATE_INTERNAL_LABEL
 113 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 114   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 115
 116 /* We want local labels to start with period if made with asm_fprintf.  */
 117 #undef LOCAL_LABEL_PREFIX
 118 #define LOCAL_LABEL_PREFIX "."
 119
 120 /* Support const sections and the ctors and dtors sections for g++.  */
 121
 122 /* Define a few machine-specific details of the implementation of
 123    constructors.
 124
 125    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 126    and CTOR_LIST_END to contribute to the .init section an instruction to
 127    push a word containing 0 (or some equivalent of that).
 128
 129    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 130
 131 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 132 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 133 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 134
 135 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 136    because they push on the stack.  */
 137
 138 #ifndef STACK_GROWS_DOWNWARD
 139
 140 /* Constructor list on stack is in reverse order.  Go to the end of the
 141    list and go backwards to call constructors in the right order.  */
 142 #define DO_GLOBAL_CTORS_BODY                                    \
 143 do {                                                            \
 144   func_ptr *p, *beg = alloca (0);                               \
 145   for (p = beg; *p; p++)                                        \
 146     ;                                                           \
 147   while (p != beg)                                              \
 148     (*--p) ();                                                  \
 149 } while (0)
 150
 151 #else
 152
 153 /* Constructor list on stack is in correct order.  Just call them.  */
 154 #define DO_GLOBAL_CTORS_BODY                                    \
 155 do {                                                            \
 156   func_ptr *p, *beg = alloca (0);                               \
 157   for (p = beg; *p; )                                           \
 158     (*p++) ();                                                  \
 159 } while (0)
 160
 161 #endif /* STACK_GROWS_DOWNWARD */
 162
 163 #undef EXTRA_SECTIONS
 164 #define EXTRA_SECTIONS in_init, in_fini
 165
 166 #undef EXTRA_SECTION_FUNCTIONS
 167 #define EXTRA_SECTION_FUNCTIONS                                 \
 168   INIT_SECTION_FUNCTION                                         \
 169   FINI_SECTION_FUNCTION
 170
 171 #define INIT_SECTION_FUNCTION                                   \
 172 void                                                            \
 173 init_section ()                                                 \
 174 {                                                               \
 175   if (in_section != in_init)                                    \
 176     {                                                           \
 177       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 178       in_section = in_init;                                     \
 179     }                                                           \
 180 }
 181
 182 #define FINI_SECTION_FUNCTION                                   \
 183 void                                                            \
 184 fini_section ()                                                 \
 185 {                                                               \
 186   if (in_section != in_fini)                                    \
 187     {                                                           \
 188       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 189       in_section = in_fini;                                     \
 190     }                                                           \
 191 }