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
  35 /* Define a symbol indicating that we are using svr3.h.  */
  36 #define USING_SVR3_H
  37
  38 /* Define a symbol so that libgcc* can know what sort of operating
  39    environment and assembler syntax we are targeting for.  */
  40 #define SVR3_target
  41
  42 /* Assembler, linker, library, and startfile spec's.  */
  43
  44 /* Output at beginning of assembler file.  */
  45 /* The .file command should always begin the output.  */
  46
  47 #undef ASM_FILE_START
  48 #define ASM_FILE_START(FILE)                                    \
  49   do { output_file_directive ((FILE), main_input_filename);     \
  50        if (optimize) { ASM_FILE_START_1 (FILE); }               \
  51      } while (0)
  52
  53 /* By default, do nothing: a few machines support .optim, but not most.  */
  54 #undef ASM_FILE_START_1
  55 #define ASM_FILE_START_1(FILE)
  56
  57 /* This says how to output an assembler line
  58    to define a global common symbol.  */
  59 /* We don't use ROUNDED because the standard compiler doesn't,
  60    and the linker gives error messages if a common symbol
  61    has more than one length value.  */
  62
  63 #undef ASM_OUTPUT_COMMON
  64 #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
  65 ( fputs (".comm ", (FILE)),                     \
  66   assemble_name ((FILE), (NAME)),               \
  67   fprintf ((FILE), ",%u\n", (SIZE)))
  68
  69 /* This says how to output an assembler line
  70    to define a local common symbol.  */
  71
  72 /* Note that using bss_section here caused errors
  73    in building shared libraries on system V.3.  */
  74 #undef ASM_OUTPUT_LOCAL
  75 #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)     \
  76   do {                                                  \
  77     int align = exact_log2 (ROUNDED);                   \
  78     if (align > 2) align = 2;                           \
  79     data_section ();                                    \
  80     ASM_OUTPUT_ALIGN ((FILE), align == -1 ? 2 : align); \
  81     ASM_OUTPUT_LABEL ((FILE), (NAME));                  \
  82     fprintf ((FILE), "\t.set .,.+%u\n", (int)(ROUNDED));        \
  83   } while (0)
  84
  85 #if 0 /* For now, let's leave these machine-specific.  */
  86 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
  87
  88 #define STARTFILE_SPEC  \
  89   "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
  90
  91 #ifdef CROSS_COMPILE
  92 #define LIB_SPEC "-lc crtn.o%s"
  93 #else
  94 #define LIB_SPEC "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} -lc crtn.o%s"
  95 #endif
  96
  97 /* Special flags for the linker.  I don't know what they do.  */
  98
  99 #define LINK_SPEC "%{T*} %{z:-lm}"
 100 #endif
 101
 102 /* Output #ident as a .ident.  */
 103
 104 #undef  ASM_OUTPUT_IDENT
 105 #define ASM_OUTPUT_IDENT(FILE, NAME) \
 106   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
 107
 108 /* Use periods rather than dollar signs in special g++ assembler names.  */
 109
 110 #define NO_DOLLAR_IN_LABEL
 111
 112 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 113
 114 #define TARGET_MEM_FUNCTIONS
 115
 116 /* System V Release 3 uses COFF debugging info.  */
 117
 118 #define SDB_DEBUGGING_INFO 1
 119
 120 /* We don't want to output DBX debugging information.  */
 121
 122 #undef DBX_DEBUGGING_INFO
 123
 124 /* Define the actual types of some ANSI-mandated types.  These
 125    definitions should work for most SVR3 systems.  */
 126
 127 #undef SIZE_TYPE
 128 #define SIZE_TYPE "unsigned int"
 129
 130 #undef PTRDIFF_TYPE
 131 #define PTRDIFF_TYPE "int"
 132
 133 #undef WCHAR_TYPE
 134 #define WCHAR_TYPE "long int"
 135
 136 #undef WCHAR_TYPE_SIZE
 137 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 138
 139 /* The prefix to add to user-visible assembler symbols.
 140
 141    For System V Release 3 the convention is to prepend a leading
 142    underscore onto user-level symbol names.  */
 143
 144 #undef USER_LABEL_PREFIX
 145 #define USER_LABEL_PREFIX "_"
 146
 147 /* This is how to store into the string LABEL
 148    the symbol_ref name of an internal numbered label where
 149    PREFIX is the class of label and NUM is the number within the class.
 150    This is suitable for output with `assemble_name'.
 151
 152    For most svr3 systems, the convention is that any symbol which begins
 153    with a period is not put into the linker symbol table by the assembler.  */
 154
 155 #undef ASM_GENERATE_INTERNAL_LABEL
 156 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 157   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 158
 159 /* We want local labels to start with period if made with asm_fprintf.  */
 160 #undef LOCAL_LABEL_PREFIX
 161 #define LOCAL_LABEL_PREFIX "."
 162
 163 /* Support const sections and the ctors and dtors sections for g++.  */
 164
 165 /* Define a few machine-specific details of the implementation of
 166    constructors.
 167
 168    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 169    and CTOR_LIST_END to contribute to the .init section an instruction to
 170    push a word containing 0 (or some equivalent of that).
 171
 172    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 173
 174 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 175 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 176 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 177
 178 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 179    because they push on the stack.  */
 180
 181 #ifndef STACK_GROWS_DOWNWARD
 182
 183 /* Constructor list on stack is in reverse order.  Go to the end of the
 184    list and go backwards to call constructors in the right order.  */
 185 #define DO_GLOBAL_CTORS_BODY                                    \
 186 do {                                                            \
 187   func_ptr *p, *beg = alloca (0);                               \
 188   for (p = beg; *p; p++)                                        \
 189     ;                                                           \
 190   while (p != beg)                                              \
 191     (*--p) ();                                                  \
 192 } while (0)
 193
 194 #else
 195
 196 /* Constructor list on stack is in correct order.  Just call them.  */
 197 #define DO_GLOBAL_CTORS_BODY                                    \
 198 do {                                                            \
 199   func_ptr *p, *beg = alloca (0);                               \
 200   for (p = beg; *p; )                                           \
 201     (*p++) ();                                                  \
 202 } while (0)
 203
 204 #endif /* STACK_GROWS_DOWNWARD */
 205
 206 #undef EXTRA_SECTIONS
 207 #define EXTRA_SECTIONS in_init, in_fini
 208
 209 #undef EXTRA_SECTION_FUNCTIONS
 210 #define EXTRA_SECTION_FUNCTIONS                                 \
 211   INIT_SECTION_FUNCTION                                         \
 212   FINI_SECTION_FUNCTION
 213
 214 #define INIT_SECTION_FUNCTION                                   \
 215 void                                                            \
 216 init_section ()                                                 \
 217 {                                                               \
 218   if (in_section != in_init)                                    \
 219     {                                                           \
 220       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 221       in_section = in_init;                                     \
 222     }                                                           \
 223 }
 224
 225 #define FINI_SECTION_FUNCTION                                   \
 226 void                                                            \
 227 fini_section ()                                                 \
 228 {                                                               \
 229   if (in_section != in_fini)                                    \
 230     {                                                           \
 231       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 232       in_section = in_fini;                                     \
 233     }                                                           \
 234 }