gcc/config/i386/djgpp.h

   1 /* Configuration for an i386 running MS-DOS with DJGPP.
   2    Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "dbxcoff.h"
  23
  24 /* Don't assume anything about the header files. */
  25 #define NO_IMPLICIT_EXTERN_C
  26
  27 #define HANDLE_SYSV_PRAGMA
  28
  29 /* Enable parsing of #pragma pack(push,<n>) and #pragma pack(pop).  */
  30 #define HANDLE_PRAGMA_PACK_PUSH_POP 1
  31
  32 #define YES_UNDERSCORES
  33
  34 #include "i386/gas.h"
  35
  36 /* If defined, a C expression whose value is a string containing the
  37    assembler operation to identify the following data as
  38    uninitialized global data.  If not defined, and neither
  39    `ASM_OUTPUT_BSS' nor `ASM_OUTPUT_ALIGNED_BSS' are defined,
  40    uninitialized global data will be output in the data section if
  41    `-fno-common' is passed, otherwise `ASM_OUTPUT_COMMON' will be
  42    used.  */
  43 #undef BSS_SECTION_ASM_OP
  44 #define BSS_SECTION_ASM_OP "\t.section\t.bss"
  45
  46 /* Enable alias attribute support.  */
  47 #ifndef SET_ASM_OP
  48 #define SET_ASM_OP "\t.set"
  49 #endif
  50
  51 /* Search for as.exe and ld.exe in DJGPP's binary directory. */
  52 #define MD_EXEC_PREFIX "$DJDIR/bin/"
  53
  54 /* Correctly handle absolute filename detection in cp/xref.c */
  55 #define FILE_NAME_ABSOLUTE_P(NAME) \
  56         (((NAME)[0] == '/') || ((NAME)[0] == '\\') || \
  57         (((NAME)[0] >= 'A') && ((NAME)[0] <= 'z') && ((NAME)[1] == ':')))
  58
  59 #ifdef CPP_PREDEFINES
  60 #undef CPP_PREDEFINES
  61 #endif
  62 #define CPP_PREDEFINES "-Dunix -Di386 -DGO32 -DDJGPP=2 -DMSDOS \
  63   -Asystem(unix) -Asystem(msdos) -Acpu(i386) -Amachine(i386)"
  64
  65 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  66    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  67    before library search directories are known by the linker.
  68    This avoids problems when specs file is not available. An alternate way,
  69    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  70 */
  71
  72 #undef LINK_COMMAND_SPEC
  73 #define LINK_COMMAND_SPEC \
  74 "%{!fsyntax-only: \
  75 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
  76 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
  77 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
  78 \t%{static:} %{L*} %D %o\
  79 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
  80 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
  81 \t-Tdjgpp.djl %{T*}}}}}}}\n\
  82 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
  83
  84 /* Always just link in 'libc.a'.  */
  85 #undef LIB_SPEC
  86 #define LIB_SPEC "-lc"
  87
  88 /* Pick the right startup code depending on the -pg flag.  */
  89 #undef STARTFILE_SPEC
  90 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
  91
  92 /* Make sure that gcc will not look for .h files in /usr/local/include
  93    unless user explicitly requests it.  */
  94 #undef LOCAL_INCLUDE_DIR
  95
  96 #undef EXTRA_SECTIONS
  97 #define EXTRA_SECTIONS in_ctor, in_dtor
  98
  99 #undef EXTRA_SECTION_FUNCTIONS
 100 #define EXTRA_SECTION_FUNCTIONS                                 \
 101   CTOR_SECTION_FUNCTION                                         \
 102   DTOR_SECTION_FUNCTION
 103
 104 #define CTOR_SECTION_FUNCTION                                   \
 105 void                                                            \
 106 ctor_section ()                                                 \
 107 {                                                               \
 108   if (in_section != in_ctor)                                    \
 109     {                                                           \
 110       fprintf (asm_out_file, "\t.section .ctor\n");             \
 111       in_section = in_ctor;                                     \
 112     }                                                           \
 113 }
 114
 115 #define DTOR_SECTION_FUNCTION                                   \
 116 void                                                            \
 117 dtor_section ()                                                 \
 118 {                                                               \
 119   if (in_section != in_dtor)                                    \
 120     {                                                           \
 121       fprintf (asm_out_file, "\t.section .dtor\n");             \
 122       in_section = in_dtor;                                     \
 123     }                                                           \
 124 }
 125
 126 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)       \
 127   do {                                          \
 128     ctor_section ();                            \
 129     fprintf (FILE, "%s\t", ASM_LONG);           \
 130     assemble_name (FILE, NAME);                 \
 131     fprintf (FILE, "\n");                       \
 132   } while (0)
 133
 134 /* Allow (eg) __attribute__((section "locked")) to work */
 135 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC)\
 136   do {                                          \
 137     fprintf (FILE, "\t.section %s\n", NAME);    \
 138   } while (0)
 139
 140 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)        \
 141   do {                                          \
 142     dtor_section ();                            \
 143     fprintf (FILE, "%s\t", ASM_LONG);           \
 144     assemble_name (FILE, NAME);                 \
 145     fprintf (FILE, "\n");                       \
 146   } while (0)
 147
 148 /* Output at beginning of assembler file.  */
 149 /* The .file command should always begin the output.  */
 150
 151 #undef ASM_FILE_START
 152 #define ASM_FILE_START(FILE)                                            \
 153   do {                                                                  \
 154         output_file_directive (FILE, main_input_filename);              \
 155   } while (0)
 156
 157 /* This is how to output an assembler line
 158    that says to advance the location counter
 159    to a multiple of 2**LOG bytes.  */
 160
 161 #undef ASM_OUTPUT_ALIGN
 162 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 163   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 164
 165 /* This is how to output a global symbol in the BSS section.  */
 166 #undef ASM_OUTPUT_ALIGNED_BSS
 167 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 168   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 169
 170 /* djgpp automatically calls its own version of __main, so don't define one
 171    in libgcc, nor call one in main().  */
 172 #define HAS_INIT_SECTION