sysv4.h

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

/* Target definitions for GNU compiler for PowerPC running System V.4
   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2004, 2005 Free Software Foundation, Inc.
   Contributed by Cygnus Support.

   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, 59 Temple Place - Suite 330, Boston,
   MA 02111-1307, USA.  */

/* Header files should be C++ aware in general.  */
#define NO_IMPLICIT_EXTERN_C

/* Yes!  We are ELF.  */
#define	TARGET_OBJECT_FORMAT OBJECT_ELF

/* Default ABI to compile code for.  */
#define DEFAULT_ABI rs6000_current_abi

/* Default ABI to use.  */
#define RS6000_ABI_NAME "sysv"

/* Override rs6000.h definition.  */
#undef	ASM_DEFAULT_SPEC
#define	ASM_DEFAULT_SPEC "-mppc"

/* Small data support types.  */
enum rs6000_sdata_type {
  SDATA_NONE,			/* No small data support.  */
  SDATA_DATA,			/* Just put data in .sbss/.sdata, don't use relocs.  */
  SDATA_SYSV,			/* Use r13 to point to .sdata/.sbss.  */
  SDATA_EABI			/* Use r13 like above, r2 points to .sdata2/.sbss2.  */
};

extern enum rs6000_sdata_type rs6000_sdata;

/* V.4/eabi switches.  */
#define	MASK_NO_BITFIELD_TYPE	0x40000000	/* Set PCC_BITFIELD_TYPE_MATTERS to 0.  */
#define	MASK_STRICT_ALIGN	0x20000000	/* Set STRICT_ALIGNMENT to 1.  */
#define	MASK_RELOCATABLE	0x10000000	/* GOT pointers are PC relative.  */
#define	MASK_EABI		0x08000000	/* Adhere to eabi, not System V spec.  */
#define	MASK_LITTLE_ENDIAN	0x04000000	/* Target is little endian.  */
#define	MASK_REGNAMES		0x02000000	/* Use alternate register names.  */
#define	MASK_PROTOTYPE		0x01000000	/* Only prototyped fcns pass variable args.  */
#define MASK_NO_BITFIELD_WORD	0x00800000	/* Bitfields cannot cross word boundaries */

#define	TARGET_NO_BITFIELD_TYPE	(target_flags & MASK_NO_BITFIELD_TYPE)
#define	TARGET_STRICT_ALIGN	(target_flags & MASK_STRICT_ALIGN)
#define	TARGET_RELOCATABLE	(target_flags & MASK_RELOCATABLE)
#define	TARGET_EABI		(target_flags & MASK_EABI)
#define	TARGET_LITTLE_ENDIAN	(target_flags & MASK_LITTLE_ENDIAN)
#define	TARGET_REGNAMES		(target_flags & MASK_REGNAMES)
#define	TARGET_PROTOTYPE	(target_flags & MASK_PROTOTYPE)
#define TARGET_NO_BITFIELD_WORD	(target_flags & MASK_NO_BITFIELD_WORD)
#define	TARGET_TOC		((target_flags & MASK_64BIT)		\
				 || ((target_flags & (MASK_RELOCATABLE	\
						      | MASK_MINIMAL_TOC)) \
				     && flag_pic > 1)			\
				 || DEFAULT_ABI == ABI_AIX)

#define	TARGET_BITFIELD_TYPE	(! TARGET_NO_BITFIELD_TYPE)
#define	TARGET_BIG_ENDIAN	(! TARGET_LITTLE_ENDIAN)
#define	TARGET_NO_PROTOTYPE	(! TARGET_PROTOTYPE)
#define	TARGET_NO_TOC		(! TARGET_TOC)
#define	TARGET_NO_EABI		(! TARGET_EABI)

/* Strings provided by SUBTARGET_OPTIONS */
extern const char *rs6000_abi_name;
extern const char *rs6000_sdata_name;
extern const char *rs6000_tls_size_string; /* For -mtls-size= */

/* Override rs6000.h definition.  */
#undef	SUBTARGET_OPTIONS
#define	SUBTARGET_OPTIONS							\
  { "call-",  &rs6000_abi_name, N_("Select ABI calling convention"), 0},	\
  { "sdata=", &rs6000_sdata_name, N_("Select method for sdata handling"), 0},	\
  { "tls-size=", &rs6000_tls_size_string,					\
   N_("Specify bit size of immediate TLS offsets"), 0 }

#define SDATA_DEFAULT_SIZE 8

/* Note, V.4 no longer uses a normal TOC, so make -mfull-toc, be just
   the same as -mminimal-toc.  */
/* Override rs6000.h definition.  */
#undef	SUBTARGET_SWITCHES
#define SUBTARGET_SWITCHES						\
  { "bit-align",	-MASK_NO_BITFIELD_TYPE,				\
    N_("Align to the base type of the bit-field") },			\
  { "no-bit-align",	 MASK_NO_BITFIELD_TYPE,				\
    N_("Don't align to the base type of the bit-field") },		\
  { "strict-align",	 MASK_STRICT_ALIGN,				\
    N_("Don't assume that unaligned accesses are handled by the system") }, \
  { "no-strict-align",	-MASK_STRICT_ALIGN,				\
    N_("Assume that unaligned accesses are handled by the system") },	\
  { "relocatable",	 MASK_RELOCATABLE | MASK_MINIMAL_TOC | MASK_NO_FP_IN_TOC, \
    N_("Produce code relocatable at runtime") },			\
  { "no-relocatable",	-MASK_RELOCATABLE,				\
    N_("Don't produce code relocatable at runtime") },			\
  { "relocatable-lib",	 MASK_RELOCATABLE | MASK_MINIMAL_TOC | MASK_NO_FP_IN_TOC, \
    N_("Produce code relocatable at runtime") },			\
  { "no-relocatable-lib", -MASK_RELOCATABLE,				\
    N_("Don't produce code relocatable at runtime") },			\
  { "little-endian",	 MASK_LITTLE_ENDIAN,				\
    N_("Produce little endian code") },					\
  { "little",		 MASK_LITTLE_ENDIAN,				\
    N_("Produce little endian code") },					\
  { "big-endian",	-MASK_LITTLE_ENDIAN,				\
    N_("Produce big endian code") },					\
  { "big",		-MASK_LITTLE_ENDIAN,				\
    N_("Produce big endian code") },					\
  { "no-toc",		 0, N_("no description yet") },			\
  { "toc",		 MASK_MINIMAL_TOC, N_("no description yet") },	\
  { "full-toc",		 MASK_MINIMAL_TOC, N_("no description yet") },	\
  { "prototype",	 MASK_PROTOTYPE, N_("no description yet") },	\
  { "no-prototype",	-MASK_PROTOTYPE, N_("no description yet") },	\
  { "no-traceback",	 0, N_("no description yet") },			\
  { "eabi",		 MASK_EABI, N_("Use EABI") },			\
  { "no-eabi",		-MASK_EABI, N_("Don't use EABI") },		\
  { "bit-word",		-MASK_NO_BITFIELD_WORD, "" },			\
  { "no-bit-word",	 MASK_NO_BITFIELD_WORD,				\
    N_("Do not allow bit-fields to cross word boundaries") },		\
  { "regnames",		  MASK_REGNAMES,				\
    N_("Use alternate register names") },				\
  { "no-regnames",	 -MASK_REGNAMES,				\
    N_("Don't use alternate register names") },				\
  { "sdata",		 0, N_("no description yet") },			\
  { "no-sdata",		 0, N_("no description yet") },			\
  { "sim",		 0,						\
    N_("Link with libsim.a, libc.a and sim-crt0.o") },			\
  { "ads",		 0,						\
    N_("Link with libads.a, libc.a and crt0.o") },			\
  { "yellowknife",	 0,						\
    N_("Link with libyk.a, libc.a and crt0.o") },			\
  { "mvme",		 0,						\
    N_("Link with libmvme.a, libc.a and crt0.o") },			\
  { "emb",		 0,						\
    N_("Set the PPC_EMB bit in the ELF flags header") },		\
  { "windiss",		 0, N_("Use the WindISS simulator") },		\
  { "shlib",		 0, N_("no description yet") },			\
  { "64",		 MASK_64BIT | MASK_POWERPC64 | MASK_POWERPC,	\
			 N_("Generate 64-bit code") },			\
  { "32",		 - (MASK_64BIT | MASK_POWERPC64),		\
			 N_("Generate 32-bit code") },			\
  EXTRA_SUBTARGET_SWITCHES						\
  { "newlib",		 0, N_("no description yet") },

/* This is meant to be redefined in the host dependent files.  */
#define EXTRA_SUBTARGET_SWITCHES

/* Sometimes certain combinations of command options do not make sense
   on a particular target machine.  You can define a macro
   `OVERRIDE_OPTIONS' to take account of this.  This macro, if
   defined, is executed once just after all the command options have
   been parsed.

   The macro SUBTARGET_OVERRIDE_OPTIONS is provided for subtargets, to
   get control.  */

#define SUBTARGET_OVERRIDE_OPTIONS					\
do {									\
  if (!g_switch_set)							\
    g_switch_value = SDATA_DEFAULT_SIZE;				\
									\
  if (rs6000_abi_name == NULL)						\
    rs6000_abi_name = RS6000_ABI_NAME;					\
									\
  if (!strcmp (rs6000_abi_name, "sysv"))				\
    rs6000_current_abi = ABI_V4;					\
  else if (!strcmp (rs6000_abi_name, "sysv-noeabi"))			\
    {									\
      rs6000_current_abi = ABI_V4;					\
      target_flags &= ~ MASK_EABI;					\
    }									\
  else if (!strcmp (rs6000_abi_name, "sysv-eabi")			\
	   || !strcmp (rs6000_abi_name, "eabi"))			\
    {									\
      rs6000_current_abi = ABI_V4;					\
      target_flags |= MASK_EABI;					\
    }									\
  else if (!strcmp (rs6000_abi_name, "aixdesc"))			\
    rs6000_current_abi = ABI_AIX;					\
  else if (!strcmp (rs6000_abi_name, "freebsd"))			\
    rs6000_current_abi = ABI_V4;					\
  else if (!strcmp (rs6000_abi_name, "linux"))				\
    {									\
      if (TARGET_64BIT)							\
	rs6000_current_abi = ABI_AIX;					\
      else								\
	rs6000_current_abi = ABI_V4;					\
    }									\
  else if (!strcmp (rs6000_abi_name, "gnu"))				\
    rs6000_current_abi = ABI_V4;					\
  else if (!strcmp (rs6000_abi_name, "netbsd"))				\
    rs6000_current_abi = ABI_V4;					\
  else if (!strcmp (rs6000_abi_name, "openbsd"))			\
    rs6000_current_abi = ABI_V4;					\
  else if (!strcmp (rs6000_abi_name, "i960-old"))			\
    {									\
      rs6000_current_abi = ABI_V4;					\
      target_flags |= (MASK_LITTLE_ENDIAN | MASK_EABI			\
		       | MASK_NO_BITFIELD_WORD);			\
      target_flags &= ~MASK_STRICT_ALIGN;				\
    }									\
  else									\
    {									\
      rs6000_current_abi = ABI_V4;					\
      error ("bad value for -mcall-%s", rs6000_abi_name);		\
    }									\
									\
  if (rs6000_sdata_name)						\
    {									\
      if (!strcmp (rs6000_sdata_name, "none"))				\
	rs6000_sdata = SDATA_NONE;					\
      else if (!strcmp (rs6000_sdata_name, "data"))			\
	rs6000_sdata = SDATA_DATA;					\
      else if (!strcmp (rs6000_sdata_name, "default"))			\
	rs6000_sdata = (TARGET_EABI) ? SDATA_EABI : SDATA_SYSV;		\
      else if (!strcmp (rs6000_sdata_name, "sysv"))			\
	rs6000_sdata = SDATA_SYSV;					\
      else if (!strcmp (rs6000_sdata_name, "eabi"))			\
	rs6000_sdata = SDATA_EABI;					\
      else								\
	error ("bad value for -msdata=%s", rs6000_sdata_name);		\
    }									\
  else if (DEFAULT_ABI == ABI_V4)					\
    {									\
      rs6000_sdata = SDATA_DATA;					\
      rs6000_sdata_name = "data";					\
    }									\
  else									\
    {									\
      rs6000_sdata = SDATA_NONE;					\
      rs6000_sdata_name = "none";					\
    }									\
									\
  if (TARGET_RELOCATABLE &&						\
      (rs6000_sdata == SDATA_EABI || rs6000_sdata == SDATA_SYSV))	\
    {									\
      rs6000_sdata = SDATA_DATA;					\
      error ("-mrelocatable and -msdata=%s are incompatible",		\
	     rs6000_sdata_name);					\
    }									\
									\
  else if (flag_pic && DEFAULT_ABI != ABI_AIX				\
	   && (rs6000_sdata == SDATA_EABI				\
	       || rs6000_sdata == SDATA_SYSV))				\
    {									\
      rs6000_sdata = SDATA_DATA;					\
      error ("-f%s and -msdata=%s are incompatible",			\
	     (flag_pic > 1) ? "PIC" : "pic",				\
	     rs6000_sdata_name);					\
    }									\
									\
  if ((rs6000_sdata != SDATA_NONE && DEFAULT_ABI != ABI_V4)		\
      || (rs6000_sdata == SDATA_EABI && !TARGET_EABI))			\
    {									\
      rs6000_sdata = SDATA_NONE;					\
      error ("-msdata=%s and -mcall-%s are incompatible",		\
	     rs6000_sdata_name, rs6000_abi_name);			\
    }									\
									\
  targetm.have_srodata_section = rs6000_sdata == SDATA_EABI;		\
									\
  if (TARGET_RELOCATABLE && !TARGET_MINIMAL_TOC)			\
    {									\
      target_flags |= MASK_MINIMAL_TOC;					\
      error ("-mrelocatable and -mno-minimal-toc are incompatible");	\
    }									\
									\
  if (TARGET_RELOCATABLE && rs6000_current_abi == ABI_AIX)		\
    {									\
      target_flags &= ~MASK_RELOCATABLE;				\
      error ("-mrelocatable and -mcall-%s are incompatible",		\
	     rs6000_abi_name);						\
    }									\
									\
  if (!TARGET_64BIT && flag_pic > 1 && rs6000_current_abi == ABI_AIX)	\
    {									\
      flag_pic = 0;							\
      error ("-fPIC and -mcall-%s are incompatible",			\
	     rs6000_abi_name);						\
    }									\
									\
  if (rs6000_current_abi == ABI_AIX && TARGET_LITTLE_ENDIAN)		\
    {									\
      target_flags &= ~MASK_LITTLE_ENDIAN;				\
      error ("-mcall-aixdesc must be big endian");			\
    }									\
									\
  /* Treat -fPIC the same as -mrelocatable.  */				\
  if (flag_pic > 1 && DEFAULT_ABI != ABI_AIX)				\
    target_flags |= MASK_RELOCATABLE | MASK_MINIMAL_TOC | MASK_NO_FP_IN_TOC; \
									\
  else if (TARGET_RELOCATABLE)						\
    flag_pic = 2;							\
} while (0)

#ifndef RS6000_BI_ARCH
# define SUBSUBTARGET_OVERRIDE_OPTIONS					\
do {									\
  if ((TARGET_DEFAULT ^ target_flags) & MASK_64BIT)			\
    error ("-m%s not supported in this configuration",			\
	   (target_flags & MASK_64BIT) ? "64" : "32");			\
} while (0)
#endif

/* Override rs6000.h definition.  */
#undef	TARGET_DEFAULT
#define	TARGET_DEFAULT (MASK_POWERPC | MASK_NEW_MNEMONICS)

/* Override rs6000.h definition.  */
#undef	PROCESSOR_DEFAULT
#define	PROCESSOR_DEFAULT PROCESSOR_PPC750

/* SVR4 only defined for PowerPC, so short-circuit POWER patterns.  */
#undef  TARGET_POWER
#define TARGET_POWER 0

#define FIXED_R2 1
/* System V.4 uses register 13 as a pointer to the small data area,
   so it is not available to the normal user.  */
#define FIXED_R13 1

/* Size of the V.4 varargs area if needed.  */
/* Override rs6000.h definition.  */
#undef	RS6000_VARARGS_AREA
#define RS6000_VARARGS_AREA (current_function_stdarg ? RS6000_VARARGS_SIZE : 0)

/* Override default big endianism definitions in rs6000.h.  */
#undef	BYTES_BIG_ENDIAN
#undef	WORDS_BIG_ENDIAN
#define	BYTES_BIG_ENDIAN (TARGET_BIG_ENDIAN)
#define	WORDS_BIG_ENDIAN (TARGET_BIG_ENDIAN)