mips.h

gcc3.2.1源代码

#if MIPS_ISA_DEFAULT != 3 && MIPS_ISA_DEFAULT != 4 && MIPS_ISA_DEFAULT != 5 && MIPS_ISA_DEFAULT != 64

/* 32-bit cases first.  */

#if MIPS_ABI_DEFAULT == ABI_EABI
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi|!mabi=*:\
  %{mips1|mips2|mips32|mlong32|mgp32:%{!mips3:%{!mips4:%{!mips5:%{!mips64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}} \
  %{mlong64:\
    %{mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
    %{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}\
  %{mips3|mips4|mips5|mips64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}} \
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}}}}}}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
"
#endif

#if MIPS_ABI_DEFAULT == ABI_O64
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi:\
  %{mips1|mips2|mips32|mlong32|mgp32:%{!mips3:%{!mips4:%{!mips5:%{!mips64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}} \
  %{mlong64:\
    %{mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
    %{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}\
  %{mips3|mips4|mips5|mips64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}} \
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}}}}}}}}\
%{mabi=o64|!mabi=*:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
"
#endif

#if MIPS_ABI_DEFAULT == ABI_32
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi:\
  %{mips1|mips2|mips32|mlong32|mgp32:%{!mips3:%{!mips4:%{!mips5:%{!mips64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}} \
  %{mlong64:\
    %{mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
    %{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}\
  %{mips3|mips4|mips5|mips64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}} \
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}}}}}}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32|!mabi=*:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
"
#endif

#if MIPS_ABI_DEFAULT == ABI_MEABI
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi:\
  %{mips1|mips2|mips32|mlong32|mgp32:%{!mips3:%{!mips4:%{!mips5:%{!mips64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}} \
  %{mlong64:\
    %{mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
    %{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}\
  %{mips3|mips4|mips5|mips64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}} \
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}}}}}}}}}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
%{mabi=meabi|!mabi=*:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
"
#endif

#else

/* 64-bit default ISA.  */

#if MIPS_ABI_DEFAULT == ABI_EABI
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi|!mabi=*: \
  %{mips1|mips2|mips32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
  %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mips3|mips4|mips5|mips64:%{!mips1:%{!mips2:%{!mips32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}\
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}}}}}}}}\
  %{mgp64:%{!mlong32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
"
#endif

#if MIPS_ABI_DEFAULT == ABI_O64
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi: \
  %{mips1|mips2|mips32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
  %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mips3|mips4|mips5|mips64:%{!mips1:%{!mips2:%{!mips32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}\
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}}}}}}}}\
  %{mgp64:%{!mlong32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}\
%{mabi=o64|!mabi=*:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
"
#endif

#if MIPS_ABI_DEFAULT == ABI_32
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi:\
  %{mips1|mips2|mips32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
  %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mips3|mips4|mips5|mips64:%{!mips1:%{!mips2:%{!mips32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}\
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}}}}}}}}\
  %{mgp64:%{!mlong32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32|!mabi=*:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
"
#endif

#if MIPS_ABI_DEFAULT == ABI_MEABI
#define SUBTARGET_CPP_SIZE_SPEC "\
%{mabi=eabi:\
  %{mips1|mips2|mips32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mlong64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
  %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int} \
  %{mips3|mips4|mips5|mips64:%{!mips1:%{!mips2:%{!mips32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}\
  %{!mips1:%{!mips2:%{!mips3:%{!mips4:%{!mips5:%{!mips32:%{!mips64:%{!mlong32:%{!mlong64:%{!mgp32:%{!mgp64:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}}}}}}}}}\
  %{mgp64:%{!mlong32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int}}}\
%{mabi=o64:\
 %{mlong64:\
   %{!mgp32:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
   %{mgp32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
 %{!mlong64:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}} \
%{mabi=32:-D__SIZE_TYPE__=unsigned\\ int -D__PTRDIFF_TYPE__=int}\
%{mabi=meabi|!mabi=*:-D__SIZE_TYPE__=long\\ unsigned\\ int -D__PTRDIFF_TYPE__=long\\ int} \
"
#endif

#endif

#endif

/* SUBTARGET_CPP_SPEC is passed to the preprocessor.  It may be
   overridden by subtargets.  */
#ifndef SUBTARGET_CPP_SPEC
#define SUBTARGET_CPP_SPEC ""
#endif

/* If we're using 64bit longs, then we have to define __LONG_MAX__
   correctly.  Similarly for 64bit ints and __INT_MAX__.  */
#ifndef LONG_MAX_SPEC
#if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_LONG64)
#define LONG_MAX_SPEC "%{!mlong32:-D__LONG_MAX__=9223372036854775807L}"
#else
#define LONG_MAX_SPEC "%{mlong64:-D__LONG_MAX__=9223372036854775807L}"
#endif
#endif

/* Define appropriate macros for fpr register size.  */
#ifndef CPP_FPR_SPEC
#if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_FLOAT64)
#define CPP_FPR_SPEC "-D__mips_fpr=64"
#else
#define CPP_FPR_SPEC "-D__mips_fpr=32"
#endif
#endif

/* For C++ we need to ensure that _LANGUAGE_C_PLUS_PLUS is defined independent
   of the source file extension.  */
#undef CPLUSPLUS_CPP_SPEC
#define CPLUSPLUS_CPP_SPEC "\
-D__LANGUAGE_C_PLUS_PLUS -D_LANGUAGE_C_PLUS_PLUS \
%(cpp) \
"
/* CPP_SPEC is the set of arguments to pass to the preprocessor.  */

#ifndef CPP_SPEC
#define CPP_SPEC "\
%{.m:	-D__LANGUAGE_OBJECTIVE_C -D_LANGUAGE_OBJECTIVE_C -D__LANGUAGE_C -D_LANGUAGE_C} \
%{.S|.s: -D__LANGUAGE_ASSEMBLY -D_LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
%{!.S: %{!.s: %{!.cc: %{!.cxx: %{!.cpp: %{!.cp: %{!.c++: %{!.C: %{!.m: -D__LANGUAGE_C -D_LANGUAGE_C %{!ansi:-DLANGUAGE_C}}}}}}}}}} \
%(subtarget_cpp_size_spec) \
%{mips3:-U__mips -D__mips=3 -D__mips64} \
%{mips4:-U__mips -D__mips=4 -D__mips64} \
%{mips32:-U__mips -D__mips=32} \
%{mips64:-U__mips -D__mips=64 -D__mips64} \
%{mgp32:-U__mips64} %{mgp64:-D__mips64} \
%{mfp32:-D__mips_fpr=32} %{mfp64:-D__mips_fpr=64} %{!mfp32: %{!mfp64: %{mgp32:-D__mips_fpr=32} %{!mgp32: %(cpp_fpr_spec)}}} \
%{msingle-float:%{!msoft-float:-D__mips_single_float}} \
%{m4650:%{!msoft-float:-D__mips_single_float}} \
%{msoft-float:-D__mips_soft_float} \
%{mabi=eabi:-D__mips_eabi} \
%{mips16:%{!mno-mips16:-D__mips16}} \
%{EB:-UMIPSEL -U_MIPSEL -U__MIPSEL -U__MIPSEL__ -D_MIPSEB -D__MIPSEB -D__MIPSEB__ %{!ansi:-DMIPSEB}} \
%{EL:-UMIPSEB -U_MIPSEB -U__MIPSEB -U__MIPSEB__ -D_MIPSEL -D__MIPSEL -D__MIPSEL__ %{!ansi:-DMIPSEL}} \
%(long_max_spec) \
%(subtarget_cpp_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							\
  { "subtarget_cc1_spec", SUBTARGET_CC1_SPEC },				\
  { "cc1_cpu_spec", CC1_CPU_SPEC},                                      \
  { "subtarget_cpp_spec", SUBTARGET_CPP_SPEC },				\
  { "subtarget_cpp_size_spec", SUBTARGET_CPP_SIZE_SPEC },		\
  { "long_max_spec", LONG_MAX_SPEC },					\
  { "cpp_fpr_spec", CPP_FPR_SPEC },					\
  { "mips_as_asm_spec", MIPS_AS_ASM_SPEC },				\
  { "gas_asm_spec", GAS_ASM_SPEC },					\
  { "abi_gas_asm_spec", ABI_GAS_ASM_SPEC },                             \
  { "target_asm_spec", TARGET_ASM_SPEC },				\
  { "subtarget_mips_as_asm_spec", SUBTARGET_MIPS_AS_ASM_SPEC }, 	\
  { "subtarget_asm_optimizing_spec", SUBTARGET_ASM_OPTIMIZING_SPEC },	\
  { "subtarget_asm_debugging_spec", SUBTARGET_ASM_DEBUGGING_SPEC },	\
  { "subtarget_asm_spec", SUBTARGET_ASM_SPEC },				\
  { "endian_spec", ENDIAN_SPEC },					\
  SUBTARGET_EXTRA_SPECS

#ifndef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS
#endif

/* If defined, this macro is an additional prefix to try after
   `STANDARD_EXEC_PREFIX'.  */

#ifndef MD_EXEC_PREFIX
#define MD_EXEC_PREFIX "/usr/lib/cmplrs/cc/"
#endif

#ifndef MD_STARTFILE_PREFIX
#define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
#endif


/* Print subsidiary information on the compiler version in use.  */

#define MIPS_VERSION "[AL 1.1, MM 40]"

#ifndef MACHINE_TYPE
#define MACHINE_TYPE "BSD Mips"
#endif

#ifndef TARGET_VERSION_INTERNAL
#define TARGET_VERSION_INTERNAL(STREAM)					\
  fprintf (STREAM, " %s %s", MIPS_VERSION, MACHINE_TYPE)
#endif

#ifndef TARGET_VERSION
#define TARGET_VERSION TARGET_VERSION_INTERNAL (stderr)
#endif


#define SDB_DEBUGGING_INFO		/* generate info for mips-tfile */
#define DBX_DEBUGGING_INFO		/* generate stabs (OSF/rose) */
#define MIPS_DEBUGGING_INFO		/* MIPS specific debugging info */

#ifndef PREFERRED_DEBUGGING_TYPE	/* assume SDB_DEBUGGING_INFO */
#define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
#endif

/* By default, turn on GDB extensions.  */
#define DEFAULT_GDB_EXTENSIONS 1

/* If we are passing smuggling stabs through the MIPS ECOFF object
   format, put a comment in front of the .stab<x> operation so
   that the MIPS assembler does not choke.  The mips-tfile program
   will correctly put the stab into the object file.  */

#define ASM_STABS_OP	((TARGET_GAS) ? "\t.stabs\t" : " #.stabs\t")
#define ASM_STABN_OP	((TARGET_GAS) ? "\t.stabn\t" : " #.stabn\t")
#define ASM_STABD_OP	((TARGET_GAS) ? "\t.stabd\t" : " #.stabd\t")

/* Local compiler-generated symbols must have a prefix that the assembler
   understands.   By default, this is $, although some targets (e.g.,
   NetBSD-ELF) need to override this.  */

#ifndef LOCAL_LABEL_PREFIX
#define LOCAL_LABEL_PREFIX	"$"
#endif

/* By default on the mips, external symbols do not have an underscore
   prepended, but some targets (e.g., NetBSD) require this.  */

#ifndef USER_LABEL_PREFIX
#define USER_LABEL_PREFIX	""
#endif

/* Forward references to tags are allowed.  */
#define SDB_ALLOW_FORWARD_REFERENCES

/* Unknown tags are also allowed.  */
#define SDB_ALLOW_UNKNOWN_REFERENCES

/* On Sun 4, this limit is 2048.  We use 1500 to be safe,
   since the length can run past this up to a continuation point.  */
#undef DBX_CONTIN_LENGTH
#define DBX_CONTIN_LENGTH 1500

/* How to renumber registers for dbx and gdb.  */
#define DBX_REGISTER_NUMBER(REGNO) mips_dbx_regno[ (REGNO) ]

/* The mapping from gcc register number to DWARF 2 CFA column number.
   This mapping does not allow for tracking register 0, since SGI's broken
   dwarf reader thinks column 0 is used for the frame address, but since
   register 0 is fixed this is not a problem.  */
#define DWARF_FRAME_REGNUM(REG)				\
  (REG == GP_REG_FIRST + 31 ? DWARF_FRAME_RETURN_COLUMN : REG)

/* The DWARF 2 CFA column which tracks the return address.  */
#define DWARF_FRAME_RETURN_COLUMN (FP_REG_LAST + 1)

/* Before the prologue, RA lives in r31.  */