gcc/config/psos.h

   1 /* Operating system specific defines to be used when targeting GCC for some
   2    embedded system running pSOS. We assume GNU tools with ELF, but
   3    try to maintain compatibility with the MRI tools. Based on svr4.h.
   4    Copyright (C) 1996, 1999, 2000 Free Software Foundation, Inc.
   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         ?????-psos.h
  26
  27    where ????? is replaced by the name of the basic hardware that you
  28    are targeting for.  Then, in the file ?????-psos.h, put something
  29    like:
  30
  31         #include "?????.h"
  32         #include "psos.h"
  33
  34    followed by any really system-specific defines (or overrides of
  35    defines) which you find that you need.
  36 */
  37
  38
  39 /* Define a symbol indicating that we are using psos.h.  */
  40
  41 #define USING_PSOS_H
  42
  43
  44 /* All pSOS targets currently use the ELF object file format.  */
  45
  46 #define OBJECT_FORMAT_ELF
  47
  48
  49 /* Provide a NULL STARTFILE_SPEC. The startfile cannot be specified
  50    here because it depends on the architecture (e.g. 68K), the
  51    board-support package (e.g. M162) and the run-time configuration
  52    (e.g. application vs. ram-image vs. rom-image). Specify the
  53    startfile in a linker-script created from the generic
  54    architecture-specific linker-scripts. */
  55
  56 #undef  STARTFILE_SPEC
  57 #define STARTFILE_SPEC ""
  58
  59
  60 /* Predefined macros (independent of processor type). */
  61
  62 #define CPP_PREDEFINES "-Dpsos"
  63
  64
  65 /* Implicit library calls should use ANSI memcpy rather than BSD
  66    bcopy, etc.  */
  67
  68 #define TARGET_MEM_FUNCTIONS
  69
  70 /* This is how we tell the assembler that a symbol is weak.  */
  71
  72 #define ASM_WEAKEN_LABEL(FILE,NAME) \
  73   do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
  74        fputc ('\n', FILE); } while (0)
  75
  76 /* Switch into a generic section. */
  77
  78 #define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
  79   fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \
  80            (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
  81            (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")
  82
  83
  84 /* Define the pseudo-ops used to switch to the .ctors and .dtors
  85    sections. */
  86
  87 #define CTORS_SECTION_ASM_OP    "\t.section\t.ctors,\"aw\""
  88 #define DTORS_SECTION_ASM_OP    "\t.section\t.dtors,\"aw\""
  89
  90 /* A default list of other sections which we might be "in" at any given
  91    time.  For targets that use additional sections (e.g. .tdesc) you
  92    should override this definition in the target-specific file which
  93    includes this file.  */
  94
  95 #undef EXTRA_SECTIONS
  96 #define EXTRA_SECTIONS in_ctors, in_dtors
  97
  98 /* A default list of extra section function definitions.  For targets
  99    that use additional sections (e.g. .tdesc) you should override this
 100    definition in the target-specific file which includes this file.  */
 101
 102 #undef EXTRA_SECTION_FUNCTIONS
 103 #define EXTRA_SECTION_FUNCTIONS                                         \
 104   CTORS_SECTION_FUNCTION                                                \
 105   DTORS_SECTION_FUNCTION
 106
 107 #define CTORS_SECTION_FUNCTION                                          \
 108 void                                                                    \
 109 ctors_section ()                                                        \
 110 {                                                                       \
 111   if (in_section != in_ctors)                                           \
 112     {                                                                   \
 113       fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);             \
 114       in_section = in_ctors;                                            \
 115     }                                                                   \
 116 }
 117
 118 #define DTORS_SECTION_FUNCTION                                          \
 119 void                                                                    \
 120 dtors_section ()                                                        \
 121 {                                                                       \
 122   if (in_section != in_dtors)                                           \
 123     {                                                                   \
 124       fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);             \
 125       in_section = in_dtors;                                            \
 126     }                                                                   \
 127 }
 128
 129 /* A C statement (sans semicolon) to output an element in the table of
 130    global constructors.  */
 131
 132 #ifndef INT_ASM_OP
 133 #define INT_ASM_OP              "\t.long\t"
 134 #endif
 135 #define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)                               \
 136   do {                                                                  \
 137     ctors_section ();                                                   \
 138     fprintf (FILE, "%s", INT_ASM_OP);                                   \
 139     assemble_name (FILE, NAME);                                         \
 140     fprintf (FILE, "\n");                                               \
 141   } while (0)
 142
 143 /* A C statement (sans semicolon) to output an element in the table of
 144    global destructors.  */
 145
 146 #define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)                                \
 147   do {                                                                  \
 148     dtors_section ();                                                   \
 149     fprintf (FILE, "%s", INT_ASM_OP);                                   \
 150     assemble_name (FILE, NAME);                                         \
 151     fprintf (FILE, "\n");                                               \
 152   } while (0)
 153
 154
 155 /* Use DBX debugging info by default.  */
 156
 157 #ifndef PREFERRED_DEBUGGING_TYPE
 158 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 159 #endif
 160
 161 /* For pSOS we use DBX debugging info.  */
 162
 163 #define DBX_DEBUGGING_INFO