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 #undef CPP_PREDEFINES
  60 #define CPP_PREDEFINES "-Dunix -DGO32 -DDJGPP=2 -DMSDOS \
  61   -Asystem(unix) -Asystem(msdos)"
  62
  63 /* We need to override link_command_spec in gcc.c so support -Tdjgpp.djl.
  64    This cannot be done in LINK_SPECS as that LINK_SPECS is processed
  65    before library search directories are known by the linker.
  66    This avoids problems when specs file is not available. An alternate way,
  67    suggested by Robert Hoehne, is to use SUBTARGET_EXTRA_SPECS instead.
  68 */
  69
  70 #undef LINK_COMMAND_SPEC
  71 #define LINK_COMMAND_SPEC \
  72 "%{!fsyntax-only: \
  73 %{!c:%{!M:%{!MM:%{!E:%{!S:%(linker) %l %X %{o*} %{A} %{d} %{e*} %{m} %{N} %{n} \
  74 \t%{r} %{s} %{t} %{u*} %{x} %{z} %{Z}\
  75 \t%{!A:%{!nostdlib:%{!nostartfiles:%S}}}\
  76 \t%{static:} %{L*} %D %o\
  77 \t%{!nostdlib:%{!nodefaultlibs:%G %L %G}}\
  78 \t%{!A:%{!nostdlib:%{!nostartfiles:%E}}}\
  79 \t-Tdjgpp.djl %{T*}}}}}}}\n\
  80 %{!c:%{!M:%{!MM:%{!E:%{!S:stubify %{v} %{o*:%*} %{!o*:a.out} }}}}}"
  81
  82 /* Always just link in 'libc.a'.  */
  83 #undef LIB_SPEC
  84 #define LIB_SPEC "-lc"
  85
  86 /* Pick the right startup code depending on the -pg flag.  */
  87 #undef STARTFILE_SPEC
  88 #define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s}"
  89
  90 /* Make sure that gcc will not look for .h files in /usr/local/include
  91    unless user explicitly requests it.  */
  92 #undef LOCAL_INCLUDE_DIR
  93
  94 #undef EXTRA_SECTIONS
  95 #define EXTRA_SECTIONS in_ctor, in_dtor
  96
  97 #undef EXTRA_SECTION_FUNCTIONS
  98 #define EXTRA_SECTION_FUNCTIONS                                 \
  99   CTOR_SECTION_FUNCTION                                         \
 100   DTOR_SECTION_FUNCTION
 101
 102 #define CTOR_SECTION_FUNCTION                                   \
 103 void                                                            \
 104 ctor_section ()                                                 \
 105 {                                                               \
 106   if (in_section != in_ctor)                                    \
 107     {                                                           \
 108       fprintf (asm_out_file, "\t.section .ctor\n");             \
 109       in_section = in_ctor;                                     \
 110     }                                                           \
 111 }
 112
 113 #define DTOR_SECTION_FUNCTION                                   \
 114 void                                                            \
 115 dtor_section ()                                                 \
 116 {                                                               \
 117   if (in_section != in_dtor)                                    \
 118     {                                                           \
 119       fprintf (asm_out_file, "\t.section .dtor\n");             \
 120       in_section = in_dtor;                                     \
 121     }                                                           \
 122 }
 123
 124 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)       \
 125   do {                                          \
 126     ctor_section ();                            \
 127     fprintf (FILE, "%s\t", ASM_LONG);           \
 128     assemble_name (FILE, NAME);                 \
 129     fprintf (FILE, "\n");                       \
 130   } while (0)
 131
 132 /* Allow (eg) __attribute__((section "locked")) to work */
 133 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC)\
 134   do {                                          \
 135     fprintf (FILE, "\t.section %s\n", NAME);    \
 136   } while (0)
 137
 138 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)        \
 139   do {                                          \
 140     dtor_section ();                            \
 141     fprintf (FILE, "%s\t", ASM_LONG);           \
 142     assemble_name (FILE, NAME);                 \
 143     fprintf (FILE, "\n");                       \
 144   } while (0)
 145
 146 /* Output at beginning of assembler file.  */
 147 /* The .file command should always begin the output.  */
 148
 149 #undef ASM_FILE_START
 150 #define ASM_FILE_START(FILE)                                            \
 151   do {                                                                  \
 152         output_file_directive (FILE, main_input_filename);              \
 153   } while (0)
 154
 155 /* This is how to output an assembler line
 156    that says to advance the location counter
 157    to a multiple of 2**LOG bytes.  */
 158
 159 #undef ASM_OUTPUT_ALIGN
 160 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
 161   if ((LOG) != 0) fprintf ((FILE), "\t.p2align %d\n", LOG)
 162
 163 /* This is how to output a global symbol in the BSS section.  */
 164 #undef ASM_OUTPUT_ALIGNED_BSS
 165 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
 166   asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
 167
 168 /* djgpp automatically calls its own version of __main, so don't define one
 169    in libgcc, nor call one in main().  */
 170 #define HAS_INIT_SECTION