sp64-elf.h

这是leon3处理器的交叉编译链

/* Definitions of target machine for GNU compiler, for SPARC64, ELF.
   Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000
   Free Software Foundation, Inc.
   Contributed by Doug Evans, [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.  */

/* ??? We're taking the scheme of including another file and then overriding
   the values we don't like a bit too far here.  The alternative is to more or
   less duplicate all of svr4.h, sparc/sysv4.h, and sparc/sol2.h here
   (suitably cleaned up).  */

#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (sparc64-elf)")

/* A 64 bit v9 compiler in a Medium/Anywhere code model environment.  */

#undef TARGET_DEFAULT
#define TARGET_DEFAULT \
(MASK_V9 + MASK_PTR64 + MASK_64BIT + MASK_HARD_QUAD \
 + MASK_APP_REGS + MASK_FPU + MASK_STACK_BIAS + MASK_LONG_DOUBLE_128)

#undef SPARC_DEFAULT_CMODEL
#define SPARC_DEFAULT_CMODEL CM_EMBMEDANY

#undef CPP_PREDEFINES
#define CPP_PREDEFINES "-Dsparc -D__ELF__ -Acpu=sparc -Amachine=sparc"

/* __svr4__ is used by the C library (FIXME) */
#undef CPP_SUBTARGET_SPEC
#define CPP_SUBTARGET_SPEC "-D__svr4__"

#undef MD_EXEC_PREFIX
#undef MD_STARTFILE_PREFIX

#undef ASM_SPEC
#define ASM_SPEC "\
%{v:-V} -s %{fpic:-K PIC} %{fPIC:-K PIC} \
%{mlittle-endian:-EL} \
%(asm_cpu) %(asm_arch) \
"

/* This is taken from sol2.h.  */
#undef LINK_SPEC
#define LINK_SPEC "\
%{v:-V} \
%{mlittle-endian:-EL} \
"

/* We need something a little simpler for the embedded environment.
   Profiling doesn't really work yet so we just copy the default.  */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC "\
%{!shared:%{pg:gcrt0.o%s}%{!pg:%{p:mcrt0.o%s}%{!p:crt0.o%s}}} \
crtbegin.o%s \
"

#undef ENDFILE_SPEC
#define ENDFILE_SPEC \
  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
   crtend.o%s"

/* Use the default (for now).  */
#undef LIB_SPEC

/* V9 chips can handle either endianness.  */
#undef SUBTARGET_SWITCHES
#define SUBTARGET_SWITCHES \
{"big-endian", -MASK_LITTLE_ENDIAN, N_("Generate code for big endian") }, \
{"little-endian", MASK_LITTLE_ENDIAN, N_("Generate code for little endian") },

#undef BYTES_BIG_ENDIAN
#define BYTES_BIG_ENDIAN (! TARGET_LITTLE_ENDIAN)

#undef WORDS_BIG_ENDIAN
#define WORDS_BIG_ENDIAN (! TARGET_LITTLE_ENDIAN)

/* ??? This should be 32 bits for v9 but what can we do?  */
#undef WCHAR_TYPE
#define WCHAR_TYPE "short unsigned int"

#undef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE 16

#undef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE 128

/* The medium/anywhere code model practically requires us to put jump tables
   in the text section as gcc is unable to distinguish LABEL_REF's of jump
   tables from other label refs (when we need to).  */
/* But we now defer the tables to the end of the function, so we make
   this 0 to not confuse the branch shortening code.  */
#undef JUMP_TABLES_IN_TEXT_SECTION
#define JUMP_TABLES_IN_TEXT_SECTION 0

/* System V Release 4 uses DWARF debugging info.
   GDB doesn't support 64 bit stabs yet and the desired debug format is DWARF
   anyway so it is the default.  */

#define DBX_DEBUGGING_INFO

#undef PREFERRED_DEBUGGING_TYPE
#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG