psos.h

GCC编译器源代码

/* Operating system specific defines to be used when targeting GCC for some
   embedded system running pSOS. We assume GNU tools with ELF, but
   try to maintain compatibility with the MRI tools. Based on svr4.h.
   Copyright (C) 1996 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.

   To use this file, make up a file with a name like:

	?????-psos.h

   where ????? is replaced by the name of the basic hardware that you
   are targeting for.  Then, in the file ?????-psos.h, put something
   like:

	#include "?????.h"
	#include "psos.h"

   followed by any really system-specific defines (or overrides of
   defines) which you find that you need.
*/


/* Define a symbol indicating that we are using psos.h.  */

#define USING_PSOS_H


/* All pSOS targets currently use the ELF object file format.  */

#define OBJECT_FORMAT_ELF


/* Provide a NULL STARTFILE_SPEC. The startfile cannot be specified
   here because it depends on the architecture (e.g. 68K), the
   board-support package (e.g. M162) and the run-time configuration
   (e.g. application vs. ram-image vs. rom-image). Specify the
   startfile in a linker-script created from the generic
   architecture-specific linker-scripts. */

#undef	STARTFILE_SPEC
#define STARTFILE_SPEC ""


/* Predefined macros (independent of processor type). */

#define CPP_PREDEFINES "-Dpsos"


/* Implicit library calls should use ANSI memcpy rather than BSD
   bcopy, etc.  */

#define TARGET_MEM_FUNCTIONS


/* When using stabs, gcc2_compiled must be a stabs entry, not an
   ordinary symbol, or gdb won't see it.  The stabs entry must be
   before the N_SO in order for gdb to find it.  */

#define ASM_IDENTIFY_GCC(FILE)						\
do									\
  {									\
    fputs (".stabs \"gcc2_compiled.\", 0x3c, 0, 0, 0\n", FILE);	\
  }									\
while (0)

/* This is how we tell the assembler that a symbol is weak.  */

#define ASM_WEAKEN_LABEL(FILE,NAME) \
  do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
       fputc ('\n', FILE); } while (0)

/* Switch into a generic section. */

#define ASM_OUTPUT_SECTION_NAME(FILE, DECL, NAME, RELOC) \
  fprintf (FILE, ".section\t%s,\"%s\",@progbits\n", NAME, \
	   (DECL) && TREE_CODE (DECL) == FUNCTION_DECL ? "ax" : \
	   (DECL) && DECL_READONLY_SECTION (DECL, RELOC) ? "a" : "aw")


/* Define the pseudo-ops used to switch to the .ctors and .dtors
   sections. */

#define CTORS_SECTION_ASM_OP	".section\t.ctors,\"aw\""
#define DTORS_SECTION_ASM_OP	".section\t.dtors,\"aw\""

/* A default list of other sections which we might be "in" at any given
   time.  For targets that use additional sections (e.g. .tdesc) you
   should override this definition in the target-specific file which
   includes this file.  */

#undef EXTRA_SECTIONS
#define EXTRA_SECTIONS in_ctors, in_dtors

/* A default list of extra section function definitions.  For targets
   that use additional sections (e.g. .tdesc) you should override this
   definition in the target-specific file which includes this file.  */

#undef EXTRA_SECTION_FUNCTIONS
#define EXTRA_SECTION_FUNCTIONS						\
  CTORS_SECTION_FUNCTION						\
  DTORS_SECTION_FUNCTION

extern void text_section ();

#define CTORS_SECTION_FUNCTION						\
void									\
ctors_section ()							\
{									\
  if (in_section != in_ctors)						\
    {									\
      fprintf (asm_out_file, "%s\n", CTORS_SECTION_ASM_OP);		\
      in_section = in_ctors;						\
    }									\
}

#define DTORS_SECTION_FUNCTION						\
void									\
dtors_section ()							\
{									\
  if (in_section != in_dtors)						\
    {									\
      fprintf (asm_out_file, "%s\n", DTORS_SECTION_ASM_OP);		\
      in_section = in_dtors;						\
    }									\
}

/* A C statement (sans semicolon) to output an element in the table of
   global constructors.  */

#ifndef INT_ASM_OP
#define INT_ASM_OP		".long"
#endif
#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)				\
  do {									\
    ctors_section ();							\
    fprintf (FILE, "\t%s\t ", INT_ASM_OP);				\
    assemble_name (FILE, NAME);						\
    fprintf (FILE, "\n");						\
  } while (0)

/* A C statement (sans semicolon) to output an element in the table of
   global destructors.  */

#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)       				\
  do {									\
    dtors_section ();                   				\
    fprintf (FILE, "\t%s\t ", INT_ASM_OP);				\
    assemble_name (FILE, NAME);              				\
    fprintf (FILE, "\n");						\
  } while (0)


/* Use DBX debugging info by default.  */

#ifndef PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
#endif

/* For pSOS we use DBX debugging info.  */

#define DBX_DEBUGGING_INFO


/* Prevent generation of an exit function.  */

#define HAVE_ATEXIT