darwin.h

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/* Target definitions for PowerPC running Darwin (Mac OS X).
   Copyright (C) 1997, 2000, 2001, 2003, 2004, 2005, 2006
   Free Software Foundation, Inc.
   Contributed by Apple Computer Inc.

   This file is part of GCC.

   GCC 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.

   GCC 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 GCC; see the file COPYING.  If not, write to the
   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#undef  TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (Darwin/PowerPC)");

/* The "Darwin ABI" is mostly like AIX, but with some key differences.  */

#define DEFAULT_ABI ABI_DARWIN

/* The object file format is Mach-O.  */

#define TARGET_OBJECT_FORMAT OBJECT_MACHO

/* We're not ever going to do TOCs.  */

#define TARGET_TOC 0
#define TARGET_NO_TOC 1

/* Override the default rs6000 definition.  */
#undef  PTRDIFF_TYPE
#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")

/* Translate config/rs6000/darwin.opt to config/darwin.h.  */
#define TARGET_DYNAMIC_NO_PIC (TARGET_MACHO_DYNAMIC_NO_PIC)

/* Handle #pragma weak and #pragma pack.  */
#define HANDLE_SYSV_PRAGMA 1


#define TARGET_OS_CPP_BUILTINS()                \
  do                                            \
    {                                           \
      if (!TARGET_64BIT) builtin_define ("__ppc__");   \
      if (TARGET_64BIT) builtin_define ("__ppc64__");  \
      builtin_define ("__POWERPC__");           \
      builtin_define ("__NATURAL_ALIGNMENT__"); \
      darwin_cpp_builtins (pfile);		\
      SUBTARGET_OS_CPP_BUILTINS ();             \
    }                                           \
  while (0)


/* The Darwin ABI always includes AltiVec, can't be (validly) turned
   off.  */

#define SUBTARGET_OVERRIDE_OPTIONS					\
do {									\
  rs6000_altivec_abi = 1;						\
  TARGET_ALTIVEC_VRSAVE = 1;						\
  if (DEFAULT_ABI == ABI_DARWIN)					\
  {									\
    if (MACHO_DYNAMIC_NO_PIC_P)						\
      {									\
        if (flag_pic)							\
            warning (0, "-mdynamic-no-pic overrides -fpic or -fPIC");	\
        flag_pic = 0;							\
      }									\
    else if (flag_pic == 1)						\
      {									\
        /* Darwin doesn't support -fpic.  */				\
        warning (0, "-fpic is not supported; -fPIC assumed");		\
        flag_pic = 2;							\
      }									\
  }									\
  if (TARGET_64BIT && ! TARGET_POWERPC64)				\
    {									\
      target_flags |= MASK_POWERPC64;					\
      warning (0, "-m64 requires PowerPC64 architecture, enabling");	\
    }									\
} while(0)

/* Darwin has 128-bit long double support in libc in 10.4 and later.
   Default to 128-bit long doubles even on earlier platforms for ABI
   consistency; arithmetic will work even if libc and libm support is
   not available.  */

#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128


/* We want -fPIC by default, unless we're using -static to compile for
   the kernel or some such.  */

#define CC1_SPEC "\
%{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
%{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
%{!static:%{!mdynamic-no-pic:-fPIC}}"

#define DARWIN_SUBARCH_SPEC "			\
 %{m64: ppc64}					\
 %{!m64:					\
 %{mcpu=601:ppc601;				\
   mcpu=603:ppc603;				\
   mcpu=603e:ppc603;				\
   mcpu=604:ppc604;				\
   mcpu=604e:ppc604e;				\
   mcpu=740:ppc750;				\
   mcpu=750:ppc750;				\
   mcpu=G3:ppc750;				\
   mcpu=7400:ppc7400;				\
   mcpu=G4:ppc7400;				\
   mcpu=7450:ppc7450;				\
   mcpu=970:ppc970;				\
   mcpu=power4:ppc970;				\
   mcpu=G5:ppc970;				\
   :ppc}}"

/* crt2.o is at least partially required for 10.3.x and earlier.  */
#define DARWIN_CRT2_SPEC \
  "%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"

#undef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS			\
  { "darwin_arch", "%{m64:ppc64;:ppc}" },	\
  { "darwin_crt2", DARWIN_CRT2_SPEC },		\
  { "darwin_subarch", DARWIN_SUBARCH_SPEC },

/* Output a .machine directive.  */
#undef TARGET_ASM_FILE_START
#define TARGET_ASM_FILE_START rs6000_darwin_file_start

/* The "-faltivec" option should have been called "-maltivec" all
   along.  -ffix-and-continue and -findirect-data is for compatibility
   for old compilers.  */

#define SUBTARGET_OPTION_TRANSLATE_TABLE				\
  { "-ffix-and-continue", "-mfix-and-continue" },			\
  { "-findirect-data", "-mfix-and-continue" },				\
  { "-faltivec", "-maltivec -include altivec.h" },			\
  { "-fno-altivec", "-mno-altivec" },					\
  { "-Waltivec-long-deprecated",	"-mwarn-altivec-long" },	\
  { "-Wno-altivec-long-deprecated", "-mno-warn-altivec-long" }

/* Make both r2 and r13 available for allocation.  */
#define FIXED_R2 0
#define FIXED_R13 0

/* Base register for access to local variables of the function.  */

#undef  HARD_FRAME_POINTER_REGNUM
#define HARD_FRAME_POINTER_REGNUM 30

#undef  RS6000_PIC_OFFSET_TABLE_REGNUM
#define RS6000_PIC_OFFSET_TABLE_REGNUM 31

/* Pad the outgoing args area to 16 bytes instead of the usual 8.  */

#undef STARTING_FRAME_OFFSET
#define STARTING_FRAME_OFFSET						\
  (FRAME_GROWS_DOWNWARD							\
   ? 0									\
   : (RS6000_ALIGN (current_function_outgoing_args_size, 16)		\
      + RS6000_SAVE_AREA))

#undef STACK_DYNAMIC_OFFSET
#define STACK_DYNAMIC_OFFSET(FUNDECL)					\
  (RS6000_ALIGN (current_function_outgoing_args_size, 16)		\
   + (STACK_POINTER_OFFSET))

/* These are used by -fbranch-probabilities */
#define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
                              "__TEXT,__unlikely,regular,pure_instructions"

/* Define cutoff for using external functions to save floating point.
   Currently on Darwin, always use inline stores.  */

#undef	FP_SAVE_INLINE
#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)

/* Darwin uses a function call if everything needs to be saved/restored.  */
#undef WORLD_SAVE_P
#define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)

/* The assembler wants the alternate register names, but without
   leading percent sign.  */
#undef REGISTER_NAMES
#define REGISTER_NAMES							\
{									\
     "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",		\
     "r8",  "r9", "r10", "r11", "r12", "r13", "r14", "r15",		\
    "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",		\
    "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",		\
     "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",		\
     "f8",  "f9", "f10", "f11", "f12", "f13", "f14", "f15",		\
    "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",		\
    "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",		\
     "mq",  "lr", "ctr",  "ap",						\
    "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",		\
    "xer",								\
     "v0",  "v1",  "v2",  "v3",  "v4",  "v5",  "v6",  "v7",             \
     "v8",  "v9", "v10", "v11", "v12", "v13", "v14", "v15",             \
    "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23",             \
    "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",             \
    "vrsave", "vscr",							\
    "spe_acc", "spefscr",                                               \