apollo68.h

gcc-2.95.3 Linux下最常用的C编译器

/* Definitions of target machine for GNU compiler.  Apollo 680X0 version.
   Copyright (C) 1989, 1992, 1996, 1997 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.  */

#include "m68k/m68k.h"

/* This symbol may be tested in other files for special Apollo handling */

#define TM_APOLLO

/* See m68k.h.  7 means 68020 with 68881.  */

#ifndef TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_BITFIELD|MASK_68881|MASK_68020)
#endif

/* Target switches for the Apollo is the same as in m68k.h, except
   there is no Sun FPA. */

#undef TARGET_SWITCHES
#define TARGET_SWITCHES  \
  { { "68020", 5},				\
    { "c68020", 5},				\
    { "68881", 2},				\
    { "bitfield", 4},				\
    { "68000", -5},				\
    { "c68000", -5},				\
    { "soft-float", -0102},			\
    { "nobitfield", -4},			\
    { "rtd", 8},				\
    { "nortd", -8},				\
    { "short", 040},				\
    { "noshort", -040},				\
    { "", TARGET_DEFAULT}}

/* Define __HAVE_68881__ in preprocessor,
   according to the -m flags.
   This will control the use of inline 68881 insns in certain macros.
   Also inform the program which CPU this is for.  */

#if TARGET_DEFAULT & MASK_68881

/* -m68881 is the default */
#define CPP_SPEC \
"%{!msoft-float:%{mfpa:-D__HAVE_FPA__ }%{!mfpa:-D__HAVE_68881__ }}\
%{!ansi:%{m68000:-Dmc68010 }%{mc68000:-Dmc68010 }%{!mc68000:%{!m68000:-Dmc68020 }}\
%{!ansi:-D_APOLLO_SOURCE}}"

#else

/* -msoft-float is the default */
#define CPP_SPEC \
"%{m68881:-D__HAVE_68881__ }%{mfpa:-D__HAVE_FPA__ }\
%{!ansi:%{m68000:-Dmc68010 }%{mc68000:-Dmc68010 }%{!mc68000:%{!m68000:-Dmc68020 }}\
%{!ansi:-D_APOLLO_SOURCE}}"

#endif

/* Names to predefine in the preprocessor for this target machine.  */
/* These are the ones defined by Apollo, plus mc68000 for uniformity with
   GCC on other 68000 systems.  */

#define CPP_PREDEFINES "-Dapollo -Daegis -Dunix -Asystem(unix)  -Acpu(m68k) -Amachine(m68k)"

/* cpp has to support a #sccs directive for the /usr/include files */

#define SCCS_DIRECTIVE

/* Allow #ident but output nothing for it.  */

#define IDENT_DIRECTIVE
#define ASM_OUTPUT_IDENT(FILE, NAME)

/* -m68000 requires special flags to the assembler.  */

#define ASM_SPEC \
 "%{m68000:-mc68010}%{mc68000:-mc68010}%{!mc68000:%{!m68000:-mc68020}}"

/* STARTFILE_SPEC
   Note that includes knowledge of the default specs for gcc, ie. no
   args translates to the same effect as -m68881 */

#if TARGET_DEFAULT & MASK_68881
/* -m68881 is the default */
#define STARTFILE_SPEC					\
  "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
#else
/* -msoft-float is the default */
#define STARTFILE_SPEC					\
  "%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}"
#endif

/* Specify library to handle `-a' basic block profiling.  */

#define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p} \
%{a:/usr/lib/bb_link.o} "

/* Debugging is not supported yet */

#undef DBX_DEBUGGING_INFO
#undef SDB_DEBUGGING_INFO

/* We have atexit(2).  So C++ can use it for global destructors.  */

#if 0 /* [e-mail] says people are still using sr10.2
	 and it does not support atexit.  */
#define HAVE_ATEXIT
#endif

/* Every structure or union's size must be a multiple of 2 bytes.  */

#define STRUCTURE_SIZE_BOUNDARY 16

/* Boundary (in *bits*) on which stack pointer should be aligned.  */
#undef STACK_BOUNDARY
#define STACK_BOUNDARY 32

/* Functions which return large structures get the address
   to place the wanted value from a hidden parameter.  */

#undef  PCC_STATIC_STRUCT_RETURN
#undef  STRUCT_VALUE_REGNUM
#define STRUCT_VALUE 0
#define STRUCT_VALUE_INCOMING 0

/* Specify how to pad function arguments.
   Arguments are not padded at all; the stack is kept aligned on long
   boundaries. */

#define FUNCTION_ARG_PADDING(mode, size) none

/* The definition of this macro imposes a limit on the size of
   an aggregate object which can be treated as if it were a scalar
   object.  */

#define MAX_FIXED_MODE_SIZE    BITS_PER_WORD

/* The definition of this macro implies that there are cases where
   a scalar value cannot be returned in registers.
   For Apollo, anything larger than one integer register is returned
   using the structure-value mechanism, i.e. objects of DFmode are
   returned that way. */

#define RETURN_IN_MEMORY(type) \
  (TYPE_MODE (type) == BLKmode \
   || GET_MODE_SIZE (TYPE_MODE (type)) > UNITS_PER_WORD)

/* In order to link with Apollo libraries, we can't prefix external
   symbols with an underscore.  */

#undef  USER_LABEL_PREFIX

/* Use a prefix for local labels, just to be on the save side.  */

#undef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX "."

/* Use a register prefix to avoid clashes with external symbols (classic
   example: `extern char PC;' in termcap).  */

#undef REGISTER_PREFIX
#define REGISTER_PREFIX "%"

/* config/m68k.md has an explicit reference to the program counter,
   prefix this by the register prefix.  */

#define ASM_RETURN_CASE_JUMP    		\
  do {						\
    if (TARGET_5200)				\
      return "ext%.l %0\n\tjmp %%pc@(2,%0:l)";	\
    else					\
      return "jmp %%pc@(2,%0:w)"		\
  } while (0)

/* Here are the new register names.  */

#undef REGISTER_NAMES
#ifndef SUPPORT_SUN_FPA
#define REGISTER_NAMES \
{"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",	\
 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",	\
 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7" }
#else /* SUPPORTED_SUN_FPA */
#define REGISTER_NAMES \
{"%d0", "%d1", "%d2", "%d3", "%d4", "%d5", "%d6", "%d7",	\
 "%a0", "%a1", "%a2", "%a3", "%a4", "%a5", "%a6", "%sp",	\
 "%fp0", "%fp1", "%fp2", "%fp3", "%fp4", "%fp5", "%fp6", "%fp7", \
 "%fpa0", "%fpa1", "%fpa2", "%fpa3", "%fpa4", "%fpa5", "%fpa6", "%fpa7", \
 "%fpa8", "%fpa9", "%fpa10", "%fpa11", "%fpa12", "%fpa13", "%fpa14", "%fpa15", \
 "%fpa16", "%fpa17", "%fpa18", "%fpa19", "%fpa20", "%fpa21", "%fpa22", "%fpa23", \
 "%fpa24", "%fpa25", "%fpa26", "%fpa27", "%fpa28", "%fpa29", "%fpa30", "%fpa31" }
#endif /* defined SUPPORT_SUN_FPA */