arm.h

俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）的全部源代码。

/* Definitions of target machine for GNU compiler, for ARM.
   Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   2001, 2002 Free Software Foundation, Inc.
   Contributed by Pieter `Tiggr' Schoenmakers ([e-mail])
   and Martin Simmons (@harleqn.co.uk).
   More major hacks by Richard Earnshaw ([e-mail])
   Minor hacks by Nick Clifton ([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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef GCC_ARM_H
#define GCC_ARM_H

/* Target CPU builtins.  */
#define TARGET_CPU_CPP_BUILTINS()			\
  do							\
    {							\
	if (TARGET_ARM)					\
	  builtin_define ("__arm__");			\
	else						\
	  builtin_define ("__thumb__");			\
							\
	if (TARGET_BIG_END)				\
	  {						\
	    builtin_define ("__ARMEB__");		\
	    if (TARGET_THUMB)				\
	      builtin_define ("__THUMBEB__");		\
	    if (TARGET_LITTLE_WORDS)			\
	      builtin_define ("__ARMWEL__");		\
	  }						\
        else						\
	  {						\
	    builtin_define ("__ARMEL__");		\
	    if (TARGET_THUMB)				\
	      builtin_define ("__THUMBEL__");		\
	  }						\
							\
	if (TARGET_APCS_32)				\
	  builtin_define ("__APCS_32__");		\
	else						\
	  builtin_define ("__APCS_26__");		\
							\
	if (TARGET_SOFT_FLOAT)				\
	  builtin_define ("__SOFTFP__");		\
							\
	/* FIXME: TARGET_HARD_FLOAT currently implies	\
	   FPA.  */					\
	if (TARGET_VFP && !TARGET_HARD_FLOAT)		\
	  builtin_define ("__VFP_FP__");		\
							\
	/* Add a define for interworking.		\
	   Needed when building libgcc.a.  */		\
	if (TARGET_INTERWORK)				\
	  builtin_define ("__THUMB_INTERWORK__");	\
							\
	builtin_assert ("cpu=arm");			\
	builtin_assert ("machine=arm");			\
	  builtin_define ("__NO_LEADING_UNDERSCORES__");		\
    } while (0)

#define TARGET_CPU_arm2		0x0000
#define TARGET_CPU_arm250	0x0000
#define TARGET_CPU_arm3		0x0000
#define TARGET_CPU_arm6		0x0001
#define TARGET_CPU_arm600	0x0001
#define TARGET_CPU_arm610	0x0002
#define TARGET_CPU_arm7		0x0001
#define TARGET_CPU_arm7m	0x0004
#define TARGET_CPU_arm7dm	0x0004
#define TARGET_CPU_arm7dmi	0x0004
#define TARGET_CPU_arm700	0x0001
#define TARGET_CPU_arm710	0x0002
#define TARGET_CPU_arm7100	0x0002
#define TARGET_CPU_arm7500	0x0002
#define TARGET_CPU_arm7500fe	0x1001
#define TARGET_CPU_arm7tdmi	0x0008
#define TARGET_CPU_arm8		0x0010
#define TARGET_CPU_arm810	0x0020
#define TARGET_CPU_strongarm	0x0040
#define TARGET_CPU_strongarm110 0x0040
#define TARGET_CPU_strongarm1100 0x0040
#define TARGET_CPU_arm9		0x0080
#define TARGET_CPU_arm9tdmi	0x0080
#define TARGET_CPU_xscale       0x0100
/* Configure didn't specify.  */
#define TARGET_CPU_generic	0x8000

typedef enum arm_cond_code
{
  ARM_EQ = 0, ARM_NE, ARM_CS, ARM_CC, ARM_MI, ARM_PL, ARM_VS, ARM_VC,
  ARM_HI, ARM_LS, ARM_GE, ARM_LT, ARM_GT, ARM_LE, ARM_AL, ARM_NV
}
arm_cc;

extern arm_cc arm_current_cc;

#define ARM_INVERSE_CONDITION_CODE(X)  ((arm_cc) (((int)X) ^ 1))

extern int arm_target_label;
extern int arm_ccfsm_state;
extern GTY(()) rtx arm_target_insn;
/* Run-time compilation parameters selecting different hardware subsets.  */
extern int target_flags;
/* The floating point instruction architecture, can be 2 or 3 */
extern const char * target_fp_name;
/* Define the information needed to generate branch insns.  This is
   stored from the compare operation.  */
extern GTY(()) rtx arm_compare_op0;
extern GTY(()) rtx arm_compare_op1;
/* The label of the current constant pool.  */
extern rtx pool_vector_label;
/* Set to 1 when a return insn is output, this means that the epilogue
   is not needed. */
extern int return_used_this_function;
/* Used to produce AOF syntax assembler.  */
extern GTY(()) rtx aof_pic_label;

/* Just in case configure has failed to define anything. */
#ifndef TARGET_CPU_DEFAULT
#define TARGET_CPU_DEFAULT TARGET_CPU_generic
#endif

/* If the configuration file doesn't specify the cpu, the subtarget may
   override it.  If it doesn't, then default to an ARM6.  */
#if TARGET_CPU_DEFAULT == TARGET_CPU_generic
#undef TARGET_CPU_DEFAULT

#ifdef SUBTARGET_CPU_DEFAULT
#define TARGET_CPU_DEFAULT SUBTARGET_CPU_DEFAULT
#else
#define TARGET_CPU_DEFAULT TARGET_CPU_arm6
#endif
#endif

#if TARGET_CPU_DEFAULT == TARGET_CPU_arm2
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_2__"
#else
#if TARGET_CPU_DEFAULT == TARGET_CPU_arm6 || TARGET_CPU_DEFAULT == TARGET_CPU_arm610 || TARGET_CPU_DEFAULT == TARGET_CPU_arm7500fe
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_3__"
#else
#if TARGET_CPU_DEFAULT == TARGET_CPU_arm7m
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_3M__"
#else
#if TARGET_CPU_DEFAULT == TARGET_CPU_arm7tdmi || TARGET_CPU_DEFAULT == TARGET_CPU_arm9 || TARGET_CPU_DEFAULT == TARGET_CPU_arm9tdmi
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_4T__"
#else
#if TARGET_CPU_DEFAULT == TARGET_CPU_arm8 || TARGET_CPU_DEFAULT == TARGET_CPU_arm810 || TARGET_CPU_DEFAULT == TARGET_CPU_strongarm || TARGET_CPU_DEFAULT == TARGET_CPU_strongarm110 || TARGET_CPU_DEFAULT == TARGET_CPU_strongarm1100 
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_4__"
#else
#if TARGET_CPU_DEFAULT == TARGET_CPU_xscale
#define CPP_ARCH_DEFAULT_SPEC "-D__ARM_ARCH_5TE__ -D__XSCALE__"
#else
Unrecognized value in TARGET_CPU_DEFAULT.
#endif
#endif
#endif
#endif
#endif
#endif

#undef  CPP_SPEC
#define CPP_SPEC "%(cpp_cpu_arch) %(subtarget_cpp_spec)			\
%{mapcs-32:%{mapcs-26:							\
	%e-mapcs-26 and -mapcs-32 may not be used together}}		\
%{msoft-float:%{mhard-float:						\
	%e-msoft-float and -mhard_float may not be used together}}	\
%{mbig-endian:%{mlittle-endian:						\
	%e-mbig-endian and -mlittle-endian may not be used together}}"

/* Set the architecture define -- if -march= is set, then it overrides
   the -mcpu= setting.  */
#define CPP_CPU_ARCH_SPEC "\
%{march=arm2:-D__ARM_ARCH_2__} \
%{march=arm250:-D__ARM_ARCH_2__} \
%{march=arm3:-D__ARM_ARCH_2__} \
%{march=arm6:-D__ARM_ARCH_3__} \
%{march=arm600:-D__ARM_ARCH_3__} \
%{march=arm610:-D__ARM_ARCH_3__} \
%{march=arm7:-D__ARM_ARCH_3__} \
%{march=arm700:-D__ARM_ARCH_3__} \
%{march=arm710:-D__ARM_ARCH_3__} \
%{march=arm720:-D__ARM_ARCH_3__} \
%{march=arm7100:-D__ARM_ARCH_3__} \
%{march=arm7500:-D__ARM_ARCH_3__} \
%{march=arm7500fe:-D__ARM_ARCH_3__} \
%{march=arm7m:-D__ARM_ARCH_3M__} \
%{march=arm7dm:-D__ARM_ARCH_3M__} \
%{march=arm7dmi:-D__ARM_ARCH_3M__} \
%{march=arm7tdmi:-D__ARM_ARCH_4T__} \
%{march=arm8:-D__ARM_ARCH_4__} \
%{march=arm810:-D__ARM_ARCH_4__} \
%{march=arm9:-D__ARM_ARCH_4T__} \
%{march=arm920:-D__ARM_ARCH_4__} \
%{march=arm920t:-D__ARM_ARCH_4T__} \
%{march=arm9tdmi:-D__ARM_ARCH_4T__} \
%{march=strongarm:-D__ARM_ARCH_4__} \
%{march=strongarm110:-D__ARM_ARCH_4__} \
%{march=strongarm1100:-D__ARM_ARCH_4__} \
%{march=xscale:-D__ARM_ARCH_5TE__} \
%{march=xscale:-D__XSCALE__} \
%{march=armv2:-D__ARM_ARCH_2__} \
%{march=armv2a:-D__ARM_ARCH_2__} \
%{march=armv3:-D__ARM_ARCH_3__} \
%{march=armv3m:-D__ARM_ARCH_3M__} \
%{march=armv4:-D__ARM_ARCH_4__} \
%{march=armv4t:-D__ARM_ARCH_4T__} \
%{march=armv5:-D__ARM_ARCH_5__} \
%{march=armv5t:-D__ARM_ARCH_5T__} \
%{march=armv5e:-D__ARM_ARCH_5E__} \
%{march=armv5te:-D__ARM_ARCH_5TE__} \
%{!march=*: \
 %{mcpu=arm2:-D__ARM_ARCH_2__} \
 %{mcpu=arm250:-D__ARM_ARCH_2__} \
 %{mcpu=arm3:-D__ARM_ARCH_2__} \
 %{mcpu=arm6:-D__ARM_ARCH_3__} \
 %{mcpu=arm600:-D__ARM_ARCH_3__} \
 %{mcpu=arm610:-D__ARM_ARCH_3__} \
 %{mcpu=arm7:-D__ARM_ARCH_3__} \
 %{mcpu=arm700:-D__ARM_ARCH_3__} \
 %{mcpu=arm710:-D__ARM_ARCH_3__} \
 %{mcpu=arm720:-D__ARM_ARCH_3__} \
 %{mcpu=arm7100:-D__ARM_ARCH_3__} \
 %{mcpu=arm7500:-D__ARM_ARCH_3__} \
 %{mcpu=arm7500fe:-D__ARM_ARCH_3__} \
 %{mcpu=arm7m:-D__ARM_ARCH_3M__} \
 %{mcpu=arm7dm:-D__ARM_ARCH_3M__} \
 %{mcpu=arm7dmi:-D__ARM_ARCH_3M__} \
 %{mcpu=arm7tdmi:-D__ARM_ARCH_4T__} \
 %{mcpu=arm8:-D__ARM_ARCH_4__} \
 %{mcpu=arm810:-D__ARM_ARCH_4__} \
 %{mcpu=arm9:-D__ARM_ARCH_4T__} \
 %{mcpu=arm920:-D__ARM_ARCH_4__} \
 %{mcpu=arm920t:-D__ARM_ARCH_4T__} \
 %{mcpu=arm9tdmi:-D__ARM_ARCH_4T__} \
 %{mcpu=strongarm:-D__ARM_ARCH_4__} \
 %{mcpu=strongarm110:-D__ARM_ARCH_4__} \
 %{mcpu=strongarm1100:-D__ARM_ARCH_4__} \
 %{mcpu=xscale:-D__ARM_ARCH_5TE__} \
 %{mcpu=xscale:-D__XSCALE__} \
 %{!mcpu*:%(cpp_cpu_arch_default)}} \
"

#ifndef CC1_SPEC
#define CC1_SPEC ""
#endif

/* This macro defines names of additional specifications to put in the specs
   that can be used in various specifications like CC1_SPEC.  Its definition
   is an initializer with a subgrouping for each command option.

   Each subgrouping contains a string constant, that defines the
   specification name, and a string constant that used by the GNU CC driver
   program.

   Do not define this macro if it does not need to do anything.  */
#define EXTRA_SPECS						\
  { "cpp_cpu_arch",		CPP_CPU_ARCH_SPEC },		\
  { "cpp_cpu_arch_default",	CPP_ARCH_DEFAULT_SPEC },	\
  { "subtarget_cpp_spec",	SUBTARGET_CPP_SPEC },           \
  SUBTARGET_EXTRA_SPECS

#ifndef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS
#endif

#ifndef SUBTARGET_CPP_SPEC
#define SUBTARGET_CPP_SPEC      ""
#endif

/* Run-time Target Specification.  */
#ifndef TARGET_VERSION
#define TARGET_VERSION fputs (" (ARM/generic)", stderr);
#endif

/* Nonzero if the function prologue (and epilogue) should obey
   the ARM Procedure Call Standard.  */
#define ARM_FLAG_APCS_FRAME	(1 << 0)

/* Nonzero if the function prologue should output the function name to enable
   the post mortem debugger to print a backtrace (very useful on RISCOS,
   unused on RISCiX).  Specifying this flag also enables
   -fno-omit-frame-pointer.
   XXX Must still be implemented in the prologue.  */
#define ARM_FLAG_POKE		(1 << 1)

/* Nonzero if floating point instructions are emulated by the FPE, in which
   case instruction scheduling becomes very uninteresting.  */
#define ARM_FLAG_FPE		(1 << 2)

/* Nonzero if destined for a processor in 32-bit program mode.  Takes out bit
   that assume restoration of the condition flags when returning from a
   branch and link (ie a function).  */
#define ARM_FLAG_APCS_32	(1 << 3)

/* FLAGS 0x0008 and 0x0010 are now spare (used to be arm3/6 selection).  */

/* Nonzero if stack checking should be performed on entry to each function
   which allocates temporary variables on the stack.  */
#define ARM_FLAG_APCS_STACK	(1 << 4)

/* Nonzero if floating point parameters should be passed to functions in
   floating point registers.  */
#define ARM_FLAG_APCS_FLOAT	(1 << 5)

/* Nonzero if re-entrant, position independent code should be generated.
   This is equivalent to -fpic.  */
#define ARM_FLAG_APCS_REENT	(1 << 6)

/* Nonzero if the MMU will trap unaligned word accesses, so shorts must
   be loaded using either LDRH or LDRB instructions.  */
#define ARM_FLAG_MMU_TRAPS	(1 << 7)

/* Nonzero if all floating point instructions are missing (and there is no
   emulator either).  Generate function calls for all ops in this case.  */
#define ARM_FLAG_SOFT_FLOAT	(1 << 8)

/* Nonzero if we should compile with BYTES_BIG_ENDIAN set to 1.  */
#define ARM_FLAG_BIG_END	(1 << 9)