gcc/gcc/config/rs6000/linux64.h

/* Definitions of target machine for GNU compiler,
   for 64 bit powerpc linux.
   Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.

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.  */

/* Yes!  We are AIX! Err. Wait. We're Linux!. No, wait, we're a
  combo of both!*/
#undef  DEFAULT_ABI
#define DEFAULT_ABI ABI_AIX

#undef TARGET_AIX
#define TARGET_AIX 1

#undef TARGET_DEFAULT
#define TARGET_DEFAULT \
  (MASK_POWERPC | MASK_POWERPC64 | MASK_64BIT | MASK_NEW_MNEMONICS)

#undef  CPP_DEFAULT_SPEC
#define CPP_DEFAULT_SPEC "-D_ARCH_PPC64"

#undef  ASM_DEFAULT_SPEC
#define ASM_DEFAULT_SPEC "-mppc64"

/* 64-bit PowerPC Linux always has a TOC.  */
#undef  TARGET_NO_TOC
#define TARGET_NO_TOC		0
#undef  TARGET_TOC
#define	TARGET_TOC		1

/* We use glibc _mcount for profiling.  */
#define NO_PROFILE_COUNTERS 1
#undef  PROFILE_BEFORE_PROLOGUE

/* Define this for kernel profiling, which just saves LR then calls
   _mcount without worrying about arg saves.  The idea is to change
   the function prologue as little as possible as it isn't easy to
   account for arg save/restore code added just for _mcount.  */
/* #define PROFILE_KERNEL 1 */
#if PROFILE_KERNEL
#define PROFILE_BEFORE_PROLOGUE 1
#undef  PROFILE_HOOK
#else
#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
#endif

/* We don't need to generate entries in .fixup.  */
#undef RELOCATABLE_NEEDS_FIXUP

#define USER_LABEL_PREFIX  ""

/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints.  */
#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \
  (TYPE_MODE (TREE_CODE (TREE_TYPE (FIELD)) == ARRAY_TYPE \
	      ? get_inner_array_type (FIELD) \
	      : TREE_TYPE (FIELD)) == DFmode \
   ? MIN ((COMPUTED), 32) : (COMPUTED))

/* AIX increases natural record alignment to doubleword if the first
   field is an FP double while the FP fields remain word aligned.  */
#undef ROUND_TYPE_ALIGN
#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED)	\
  ((TREE_CODE (STRUCT) == RECORD_TYPE			\
    || TREE_CODE (STRUCT) == UNION_TYPE			\
    || TREE_CODE (STRUCT) == QUAL_UNION_TYPE)		\
   && TYPE_FIELDS (STRUCT) != 0				\
   && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode	\
   ? MAX (MAX ((COMPUTED), (SPECIFIED)), 64)		\
   : MAX ((COMPUTED), (SPECIFIED)))

/* Indicate that jump tables go in the text section.  */
#undef  JUMP_TABLES_IN_TEXT_SECTION
#define JUMP_TABLES_IN_TEXT_SECTION 1

/* 64-bit PowerPC Linux always has GPR13 fixed.  */
#define FIXED_R13		1

/* __throw will restore its own return address to be the same as the
   return address of the function that the throw is being made to.
   This is unfortunate, because we want to check the original
   return address to see if we need to restore the TOC.
   So we have to squirrel it away with this.  */
#define SETUP_FRAME_ADDRESSES() rs6000_aix_emit_builtin_unwind_init ()

/* Don't assume anything about the header files.  */
#define NO_IMPLICIT_EXTERN_C

#undef MD_EXEC_PREFIX
#undef MD_STARTFILE_PREFIX

#undef  CPP_PREDEFINES
#define CPP_PREDEFINES \
 "-D_PPC_ -D__PPC__ -D_PPC64_ -D__PPC64__ -D__powerpc__ -D__powerpc64__ \
  -D_PIC_ -D__PIC__ -D_BIG_ENDIAN -D__BIG_ENDIAN__ -D__ELF__ \
  -D__LONG_MAX__=9223372036854775807L \
  -Acpu=powerpc64 -Amachine=powerpc64"

#undef  CPP_OS_DEFAULT_SPEC
#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"

/* The GNU C++ standard library currently requires _GNU_SOURCE being
   defined on glibc-based systems. This temporary hack accomplishes this,
   it should go away as soon as libstdc++-v3 has a real fix.  */
#undef  CPLUSPLUS_CPP_SPEC
#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"

#undef  LINK_SHLIB_SPEC
#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"

#undef  LIB_DEFAULT_SPEC
#define LIB_DEFAULT_SPEC "%(lib_linux)"

#undef  STARTFILE_DEFAULT_SPEC
#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"

#undef	ENDFILE_DEFAULT_SPEC
#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"

#undef	LINK_START_DEFAULT_SPEC
#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"

#undef	LINK_OS_DEFAULT_SPEC
#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"

#undef  LINK_OS_LINUX_SPEC
#ifndef CROSS_COMPILE
#define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
  %{rdynamic:-export-dynamic} \
  %{!dynamic-linker:-dynamic-linker /lib64/ld.so.1}}}"
#else
#define LINK_OS_LINUX_SPEC "-m elf64ppc %{!shared: %{!static: \
  %{rdynamic:-export-dynamic} \
  %{!dynamic-linker:-dynamic-linker ld.so.1}}}"
#endif

#ifndef CROSS_COMPILE
#undef  STARTFILE_LINUX_SPEC
#define STARTFILE_LINUX_SPEC "\
%{!shared: %{pg:/usr/lib64/gcrt1.o%s} %{!pg:%{p:/usr/lib64/gcrt1.o%s} \
  %{!p:/usr/lib64/crt1.o%s}}} /usr/lib64/crti.o%s \
%{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
#endif

#ifndef CROSS_COMPILE
#undef  ENDFILE_LINUX_SPEC
#define ENDFILE_LINUX_SPEC "\
%{!shared:crtend.o%s} %{shared:crtendS.o%s} /usr/lib64/crtn.o%s"
#endif

#undef  TOC_SECTION_ASM_OP
#define TOC_SECTION_ASM_OP "\t.section\t\".toc\",\"aw\""

#undef  MINIMAL_TOC_SECTION_ASM_OP
#define MINIMAL_TOC_SECTION_ASM_OP "\t.section\t\".toc1\",\"aw\""

#undef  TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (PowerPC64 GNU/Linux)");

/* Must be at least as big as our pointer type.  */
#undef  SIZE_TYPE
#define SIZE_TYPE "long unsigned int"

#undef  PTRDIFF_TYPE
#define PTRDIFF_TYPE "long int"

#undef  WCHAR_TYPE
#define WCHAR_TYPE "int"
#undef  WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 32

/* Override rs6000.h definition.  */
#undef  ASM_APP_ON
#define ASM_APP_ON "#APP\n"

/* Override rs6000.h definition.  */
#undef  ASM_APP_OFF
#define ASM_APP_OFF "#NO_APP\n"

/* PowerPC no-op instruction.  */
#undef  RS6000_CALL_GLUE
#define RS6000_CALL_GLUE "nop"

#undef  RS6000_MCOUNT
#define RS6000_MCOUNT "_mcount"

/* FP save and restore routines.  */
#undef  SAVE_FP_PREFIX
#define SAVE_FP_PREFIX "._savef"
#undef  SAVE_FP_SUFFIX
#define SAVE_FP_SUFFIX ""
#undef  RESTORE_FP_PREFIX
#define RESTORE_FP_PREFIX "._restf"
#undef  RESTORE_FP_SUFFIX
#define RESTORE_FP_SUFFIX ""

/* Dwarf2 debugging.  */
#undef  PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG

#undef  TARGET_ENCODE_SECTION_INFO
#define TARGET_ENCODE_SECTION_INFO  rs6000_xcoff_encode_section_info

/* This is how to output a reference to a user-level label named NAME.
   `assemble_name' uses this.  */

/* Override elfos.h definition.  */
#undef  ASM_OUTPUT_LABELREF
#define ASM_OUTPUT_LABELREF(FILE,NAME)		\
do {						\
  const char *_name = NAME;			\
  if (*_name == '@')				\
    _name++;					\
 						\
  if (*_name == '*')				\
    fprintf (FILE, "%s", _name + 1);		\
  else						\
    asm_fprintf (FILE, "%U%s", _name);		\
} while (0)

#undef  ASM_DECLARE_FUNCTION_NAME
#define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL)			\
  do									\
    {									\
      fputs ("\t.section\t\".opd\",\"aw\"\n\t.align 3\n", (FILE));	\
      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
      fputs (DOUBLE_INT_ASM_OP, (FILE));				\
      putc ('.', (FILE));						\
      assemble_name ((FILE), (NAME));					\
      fputs (",.TOC.@tocbase,0\n\t.previous\n\t.size\t", (FILE));	\
      assemble_name ((FILE), (NAME));					\
      fputs (",24\n\t.type\t.", (FILE));				\
      assemble_name ((FILE), (NAME));					\
      fputs (",@function\n", (FILE));					\
      if (TREE_PUBLIC (DECL) && ! DECL_WEAK (DECL))			\
        {								\
	  fputs ("\t.globl\t.", (FILE));				\
	  assemble_name ((FILE), (NAME));				\
	  putc ('\n', (FILE));						\
        }								\
      ASM_DECLARE_RESULT ((FILE), DECL_RESULT (DECL));			\
      putc ('.', (FILE));						\
      ASM_OUTPUT_LABEL ((FILE), (NAME));				\
    }									\
  while (0)

/* This is how to declare the size of a function.  */
#undef	ASM_DECLARE_FUNCTION_SIZE
#define	ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL)			\
  do									\
    {									\
      if (!flag_inhibit_size_directive)					\
	{								\
	  fputs ("\t.size\t.", (FILE));					\
	  assemble_name ((FILE), (FNAME));				\
	  fputs (",.-.", (FILE));					\
	  assemble_name ((FILE), (FNAME));				\
	  putc ('\n', (FILE));						\
	}								\
    }									\
  while (0)

/* Return non-zero if this entry is to be written into the constant
   pool in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF
   or a CONST containing one of them.  If -mfp-in-toc (the default),
   we also do this for floating-point constants.  We actually can only
   do this if the FP formats of the target and host machines are the
   same, but we can't check that since not every file that uses
   GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  We also do this when
   we can write the entry into the TOC and the entry is not larger
   than a TOC entry.  */

#undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)			\
  (TARGET_TOC								\
   && (GET_CODE (X) == SYMBOL_REF					\
       || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS	\
	   && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)		\
       || GET_CODE (X) == LABEL_REF					\
       || (GET_CODE (X) == CONST_INT 					\
	   && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))	\
       || (GET_CODE (X) == CONST_DOUBLE					\
	   && (TARGET_POWERPC64						\
	       || TARGET_MINIMAL_TOC					\
	       || (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT		\
		   && ! TARGET_NO_FP_IN_TOC)))))