linux-gas.h

linux下的gcc编译器

/* Definitions of target machine for GNU compiler.
   ARM Linux-based GNU systems version.
   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   Contributed by Russell King  <[e-mail]>.

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 this program; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* This is how we tell the assembler that a symbol is weak.
   GAS always supports weak symbols.  */

/* This is used in ASM_FILE_START.  */
#undef  ARM_OS_NAME
#define ARM_OS_NAME "Linux"

/* Unsigned chars produces much better code than signed.  */
#define DEFAULT_SIGNED_CHAR 0

#undef  SUBTARGET_CPP_SPEC
#define SUBTARGET_CPP_SPEC  "%{posix:-D_POSIX_SOURCE} %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__}"

#undef  SIZE_TYPE
#define SIZE_TYPE "unsigned int"

#undef  PTRDIFF_TYPE
#define PTRDIFF_TYPE "int"

#undef  WCHAR_TYPE
#define WCHAR_TYPE "long int"

#undef  WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE BITS_PER_WORD

/* Emit code to set up a trampoline and synchronize the caches.  */
#undef  INITIALIZE_TRAMPOLINE
#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)			\
{									\
  emit_move_insn (gen_rtx (MEM, SImode, plus_constant ((TRAMP), 8)),	\
		  (CXT));						\
  emit_move_insn (gen_rtx (MEM, SImode, plus_constant ((TRAMP), 12)),	\
		  (FNADDR));						\
  emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__clear_cache"),	\
		     0, VOIDmode, 2, TRAMP, Pmode,			\
		     plus_constant (TRAMP, TRAMPOLINE_SIZE), Pmode);	\
}

/* Clear the instruction cache from `beg' to `end'.  This makes an
   inline system call to SYS_cacheflush.  */
#define CLEAR_INSN_CACHE(BEG, END)					\
{									\
  register unsigned long _beg __asm ("a1") = (unsigned long) (BEG);	\
  register unsigned long _end __asm ("a2") = (unsigned long) (END);	\
  register unsigned long _flg __asm ("a3") = 0;				\
  __asm __volatile ("swi 0x9f0002		@ sys_cacheflush"	\
		    : "=r" (_beg)					\
		    : "0" (_beg), "r" (_end), "r" (_flg));		\
}