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, 2007 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 3, 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 COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>. */
  21
  22 /* Define a symbol indicating that we are using svr3.h.  */
  23 #define USING_SVR3_H
  24
  25 /* Define a symbol so that libgcc* can know what sort of operating
  26    environment and assembler syntax we are targeting for.  */
  27 #define SVR3_target
  28
  29 /* Assembler, linker, library, and startfile spec's.  */
  30
  31 /* The .file command should always begin the output.  */
  32 #define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
  33
  34 /* This says how to output an assembler line
  35    to define a global common symbol.  */
  36 /* We don't use ROUNDED because the standard compiler doesn't,
  37    and the linker gives error messages if a common symbol
  38    has more than one length value.  */
  39
  40 #undef ASM_OUTPUT_COMMON
  41 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
  42 ( fputs (".comm ", (FILE)),                     \
  43   assemble_name ((FILE), (NAME)),               \
  44   fprintf ((FILE), ",%lu\n", (unsigned long)(SIZE)))
  45
  46 /* This says how to output an assembler line
  47    to define a local common symbol.  */
  48
  49 /* Note that using bss_section here caused errors
  50    in building shared libraries on system V.3.  */
  51 #undef ASM_OUTPUT_LOCAL
  52 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  53   do {                                                  \
  54     int align = exact_log2 (ROUNDED);                   \
  55     if (align > 2) align = 2;                           \
  56     switch_to_section (data_section);                   \
  57     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  58     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
  59     fprintf ((FILE), "\t.set .,.+%u\n", (int)(ROUNDED));        \
  60   } while (0)
  61
  62 /* Output #ident as a .ident.  */
  63
  64 #undef  ASM_OUTPUT_IDENT
  65 #define ASM_OUTPUT_IDENT(FILE, NAME) \
  66   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
  67
  68 /* Use periods rather than dollar signs in special g++ assembler names.  */
  69
  70 #define NO_DOLLAR_IN_LABEL
  71
  72 /* System V Release 3 uses COFF debugging info.  */
  73
  74 #define SDB_DEBUGGING_INFO 1
  75
  76 /* We don't want to output DBX debugging information.  */
  77
  78 #undef DBX_DEBUGGING_INFO
  79
  80 /* Define the actual types of some ANSI-mandated types.  These
  81    definitions should work for most SVR3 systems.  */
  82
  83 #undef SIZE_TYPE
  84 #define SIZE_TYPE "unsigned int"
  85
  86 #undef PTRDIFF_TYPE
  87 #define PTRDIFF_TYPE "int"
  88
  89 #undef WCHAR_TYPE
  90 #define WCHAR_TYPE "long int"
  91
  92 #undef WCHAR_TYPE_SIZE
  93 #define WCHAR_TYPE_SIZE BITS_PER_WORD
  94
  95 /* The prefix to add to user-visible assembler symbols.
  96
  97    For System V Release 3 the convention is to prepend a leading
  98    underscore onto user-level symbol names.  */
  99
 100 #undef USER_LABEL_PREFIX
 101 #define USER_LABEL_PREFIX "_"
 102
 103 /* This is how to store into the string LABEL
 104    the symbol_ref name of an internal numbered label where
 105    PREFIX is the class of label and NUM is the number within the class.
 106    This is suitable for output with `assemble_name'.
 107
 108    For most svr3 systems, the convention is that any symbol which begins
 109    with a period is not put into the linker symbol table by the assembler.  */
 110
 111 #undef ASM_GENERATE_INTERNAL_LABEL
 112 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 113   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 114
 115 /* We want local labels to start with period if made with asm_fprintf.  */
 116 #undef LOCAL_LABEL_PREFIX
 117 #define LOCAL_LABEL_PREFIX "."
 118
 119 /* Support const sections and the ctors and dtors sections for g++.  */
 120
 121 /* Define a few machine-specific details of the implementation of
 122    constructors.
 123
 124    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 125    and CTOR_LIST_END to contribute to the .init section an instruction to
 126    push a word containing 0 (or some equivalent of that).
 127
 128    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 129
 130 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 131 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 132 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 133
 134 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 135    because they push on the stack.  */
 136
 137 #ifndef STACK_GROWS_DOWNWARD
 138
 139 /* Constructor list on stack is in reverse order.  Go to the end of the
 140    list and go backwards to call constructors in the right order.  */
 141 #define DO_GLOBAL_CTORS_BODY                                    \
 142 do {                                                            \
 143   func_ptr *p, *beg = alloca (0);                               \
 144   for (p = beg; *p; p++)                                        \
 145     ;                                                           \
 146   while (p != beg)                                              \
 147     (*--p) ();                                                  \
 148 } while (0)
 149
 150 #else
 151
 152 /* Constructor list on stack is in correct order.  Just call them.  */
 153 #define DO_GLOBAL_CTORS_BODY                                    \
 154 do {                                                            \
 155   func_ptr *p, *beg = alloca (0);                               \
 156   for (p = beg; *p; )                                           \
 157     (*p++) ();                                                  \
 158 } while (0)
 159
 160 #endif /* STACK_GROWS_DOWNWARD */