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 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 /* Allow #sccs in preprocessor.  */
 117
 118 #define SCCS_DIRECTIVE
 119
 120 /* Output #ident as a .ident.  */
 121
 122 #undef  ASM_OUTPUT_IDENT
 123 #define ASM_OUTPUT_IDENT(FILE, NAME) \
 124   fprintf (FILE, "\t.ident \"%s\"\n", NAME);
 125
 126 /* Use periods rather than dollar signs in special g++ assembler names.  */
 127
 128 #define NO_DOLLAR_IN_LABEL
 129
 130 /* Implicit library calls should use memcpy, not bcopy, etc.  */
 131
 132 #define TARGET_MEM_FUNCTIONS
 133
 134 /* System V Release 3 uses COFF debugging info.  */
 135
 136 #define SDB_DEBUGGING_INFO
 137
 138 /* We don't want to output DBX debugging information.  */
 139
 140 #undef DBX_DEBUGGING_INFO
 141
 142 /* Define the actual types of some ANSI-mandated types.  These
 143    definitions should work for most SVR3 systems.  */
 144
 145 #undef SIZE_TYPE
 146 #define SIZE_TYPE "unsigned int"
 147
 148 #undef PTRDIFF_TYPE
 149 #define PTRDIFF_TYPE "int"
 150
 151 #undef WCHAR_TYPE
 152 #define WCHAR_TYPE "long int"
 153
 154 #undef WCHAR_TYPE_SIZE
 155 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 156
 157 /* The prefix to add to user-visible assembler symbols.
 158
 159    For System V Release 3 the convention is to prepend a leading
 160    underscore onto user-level symbol names.  */
 161
 162 #undef USER_LABEL_PREFIX
 163 #define USER_LABEL_PREFIX "_"
 164
 165 /* This is how to output an internal numbered label where
 166    PREFIX is the class of label and NUM is the number within the class.
 167
 168    For most svr3 systems, the convention is that any symbol which begins
 169    with a period is not put into the linker symbol table by the assembler.  */
 170
 171 #undef ASM_OUTPUT_INTERNAL_LABEL
 172 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)      \
 173   asm_fprintf (FILE, "%0L%s%d:\n", PREFIX, NUM)
 174
 175 /* This is how to store into the string LABEL
 176    the symbol_ref name of an internal numbered label where
 177    PREFIX is the class of label and NUM is the number within the class.
 178    This is suitable for output with `assemble_name'.
 179
 180    For most svr3 systems, the convention is that any symbol which begins
 181    with a period is not put into the linker symbol table by the assembler.  */
 182
 183 #undef ASM_GENERATE_INTERNAL_LABEL
 184 #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)   \
 185   sprintf (LABEL, "*%s%s%ld", LOCAL_LABEL_PREFIX, PREFIX, (long)(NUM))
 186
 187 /* We want local labels to start with period if made with asm_fprintf.  */
 188 #undef LOCAL_LABEL_PREFIX
 189 #define LOCAL_LABEL_PREFIX "."
 190
 191 /* Support const sections and the ctors and dtors sections for g++.
 192    Note that there appears to be two different ways to support const
 193    sections at the moment.  You can either #define the symbol
 194    READONLY_DATA_SECTION (giving it some code which switches to the
 195    readonly data section) or else you can #define the symbols
 196    EXTRA_SECTIONS, EXTRA_SECTION_FUNCTIONS, SELECT_SECTION, and
 197    SELECT_RTX_SECTION.  We do both here just to be on the safe side.
 198    However, use of the const section is turned off by default
 199    unless the specific tm.h file turns it on by defining
 200    USE_CONST_SECTION as 1.  */
 201
 202 /* Define a few machine-specific details of the implementation of
 203    constructors.
 204
 205    The __CTORS_LIST__ goes in the .init section.  Define CTOR_LIST_BEGIN
 206    and CTOR_LIST_END to contribute to the .init section an instruction to
 207    push a word containing 0 (or some equivalent of that).
 208
 209    Define TARGET_ASM_CONSTRUCTOR to push the address of the constructor.  */
 210
 211 #define USE_CONST_SECTION       0
 212
 213 #define INIT_SECTION_ASM_OP     "\t.section\t.init"
 214 #define FINI_SECTION_ASM_OP     "\t.section .fini,\"x\""
 215 #define CONST_SECTION_ASM_OP    "\t.section\t.rodata, \"x\""
 216 #define DTORS_SECTION_ASM_OP    FINI_SECTION_ASM_OP
 217
 218 /* CTOR_LIST_BEGIN and CTOR_LIST_END are machine-dependent
 219    because they push on the stack.  */
 220
 221 #ifndef STACK_GROWS_DOWNWARD
 222
 223 /* Constructor list on stack is in reverse order.  Go to the end of the
 224    list and go backwards to call constructors in the right order.  */
 225 #define DO_GLOBAL_CTORS_BODY                                    \
 226 do {                                                            \
 227   func_ptr *p, *beg = alloca (0);                               \
 228   for (p = beg; *p; p++)                                        \
 229     ;                                                           \
 230   while (p != beg)                                              \
 231     (*--p) ();                                                  \
 232 } while (0)
 233
 234 #else
 235
 236 /* Constructor list on stack is in correct order.  Just call them.  */
 237 #define DO_GLOBAL_CTORS_BODY                                    \
 238 do {                                                            \
 239   func_ptr *p, *beg = alloca (0);                               \
 240   for (p = beg; *p; )                                           \
 241     (*p++) ();                                                  \
 242 } while (0)
 243
 244 #endif /* STACK_GROWS_DOWNWARD */
 245
 246 /* Add extra sections .rodata, .init and .fini.  */
 247
 248 #undef EXTRA_SECTIONS
 249 #define EXTRA_SECTIONS in_const, in_init, in_fini
 250
 251 #undef EXTRA_SECTION_FUNCTIONS
 252 #define EXTRA_SECTION_FUNCTIONS                                 \
 253   CONST_SECTION_FUNCTION                                        \
 254   INIT_SECTION_FUNCTION                                         \
 255   FINI_SECTION_FUNCTION
 256
 257 #define INIT_SECTION_FUNCTION                                   \
 258 void                                                            \
 259 init_section ()                                                 \
 260 {                                                               \
 261   if (in_section != in_init)                                    \
 262     {                                                           \
 263       fprintf (asm_out_file, "%s\n", INIT_SECTION_ASM_OP);      \
 264       in_section = in_init;                                     \
 265     }                                                           \
 266 }
 267
 268 #define FINI_SECTION_FUNCTION                                   \
 269 void                                                            \
 270 fini_section ()                                                 \
 271 {                                                               \
 272   if (in_section != in_fini)                                    \
 273     {                                                           \
 274       fprintf (asm_out_file, "%s\n", FINI_SECTION_ASM_OP);      \
 275       in_section = in_fini;                                     \
 276     }                                                           \
 277 }
 278
 279 #define READONLY_DATA_SECTION() const_section ()
 280
 281 #define CONST_SECTION_FUNCTION                                          \
 282 void                                                                    \
 283 const_section ()                                                        \
 284 {                                                                       \
 285   if (!USE_CONST_SECTION)                                               \
 286     text_section();                                                     \
 287   else if (in_section != in_const)                                      \
 288     {                                                                   \
 289       fprintf (asm_out_file, "%s\n", CONST_SECTION_ASM_OP);             \
 290       in_section = in_const;                                            \
 291     }                                                                   \
 292 }
 293
 294 /* A C statement or statements to switch to the appropriate
 295    section for output of DECL.  DECL is either a `VAR_DECL' node
 296    or a constant of some sort.  RELOC indicates whether forming
 297    the initial value of DECL requires link-time relocations.  */
 298
 299 #undef  SELECT_SECTION
 300 #define SELECT_SECTION(DECL,RELOC,ALIGN)                                \
 301 {                                                                       \
 302   if (TREE_CODE (DECL) == STRING_CST)                                   \
 303     {                                                                   \
 304       if (! flag_writable_strings)                                      \
 305         const_section ();                                               \
 306       else                                                              \
 307         data_section ();                                                \
 308     }                                                                   \
 309   else if (TREE_CODE (DECL) == VAR_DECL)                                \
 310     {                                                                   \
 311       if ((0 && RELOC)  /* should be (flag_pic && RELOC) */             \
 312           || !TREE_READONLY (DECL) || TREE_SIDE_EFFECTS (DECL)          \
 313           || !DECL_INITIAL (DECL)                                       \
 314           || (DECL_INITIAL (DECL) != error_mark_node                    \
 315               && !TREE_CONSTANT (DECL_INITIAL (DECL))))                 \
 316         data_section ();                                                \
 317       else                                                              \
 318         const_section ();                                               \
 319     }                                                                   \
 320   else                                                                  \
 321     const_section ();                                                   \
 322 }
 323
 324 /* A C statement or statements to switch to the appropriate
 325    section for output of RTX in mode MODE.  RTX is some kind
 326    of constant in RTL.  The argument MODE is redundant except
 327    in the case of a `const_int' rtx.  Currently, these always
 328    go into the const section.  */
 329
 330 #undef  SELECT_RTX_SECTION
 331 #define SELECT_RTX_SECTION(MODE,RTX,ALIGN) const_section()