1  /* Definitions for Rs6000 running LynxOS.
       2     Copyright (C) 1995-2023 Free Software Foundation, Inc.
       3     Contributed by David Henkel-Wallace, Cygnus Support (gumby@cygnus.com)
       4     Rewritten by Adam Nemet, LynuxWorks Inc.
       5  
       6     This file is part of GCC.
       7  
       8     GCC is free software; you can redistribute it and/or modify it
       9     under the terms of the GNU General Public License as published
      10     by the Free Software Foundation; either version 3, or (at your
      11     option) any later version.
      12  
      13     GCC is distributed in the hope that it will be useful, but WITHOUT
      14     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      15     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
      16     License for more details.
      17  
      18     You should have received a copy of the GNU General Public License
      19     along with GCC; see the file COPYING3.  If not see
      20     <http://www.gnu.org/licenses/>.  */
      21  
      22  /* Undefine the definition to enable the LynxOS default from the
      23     top-level lynx.h.  */
      24  
      25  #undef SUBTARGET_EXTRA_SPECS
      26  
      27  /* Get rid off the spec definitions from rs6000/sysv4.h.  */
      28  
      29  #undef CPP_SPEC
      30  #define CPP_SPEC \
      31  "%{msoft-float: -D_SOFT_FLOAT} \
      32   %(cpp_cpu) \
      33   %(cpp_os_lynx)"
      34  
      35  /* LynxOS only supports big-endian on PPC so we override the
      36     definition from sysv4.h.  Since the LynxOS 4.0 compiler was set to
      37     return every structure in memory regardless of their size we have
      38     to emulate the same behavior here with disabling the SVR4 structure
      39     returning.  */
      40  
      41  #undef CC1_SPEC
      42  #define CC1_SPEC \
      43  "%{G*} %{mno-sdata:-msdata=none} \
      44   %{maltivec:-mabi=altivec} \
      45   -maix-struct-return"
      46  
      47  #undef ASM_SPEC
      48  #define ASM_SPEC \
      49  "%(asm_cpu) \
      50   %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}"
      51  
      52  #undef STARTFILE_SPEC
      53  #undef ENDFILE_SPEC
      54  #undef LIB_SPEC
      55  #undef LINK_SPEC
      56  #define LINK_SPEC \
      57  "%{!msdata=none:%{G*}} %{msdata=none:-G0} \
      58   %(link_os_lynx)"
      59  
      60  /* Override the definition from sysv4.h.  */
      61  
      62  #undef TARGET_OS_CPP_BUILTINS
      63  #define TARGET_OS_CPP_BUILTINS()		\
      64    do						\
      65      {						\
      66        builtin_define ("__BIG_ENDIAN__");	\
      67        builtin_define ("__powerpc__");		\
      68        builtin_assert ("cpu=powerpc");		\
      69        builtin_assert ("machine=powerpc");	\
      70        builtin_define ("__PPC__");		\
      71      }						\
      72    while (0)
      73  
      74  /* LynxOS does not do anything with .fixup plus let's not create
      75     writable section for linkonce.r and linkonce.t.  */
      76  
      77  #undef RELOCATABLE_NEEDS_FIXUP
      78  
      79  /* Override these from rs6000.h with the generic definition.  */
      80  
      81  #undef SIZE_TYPE
      82  #undef ASM_OUTPUT_ALIGN
      83  
      84  /* The file rs6000.cc defines TARGET_HAVE_TLS unconditionally to the
      85     value of HAVE_AS_TLS.  HAVE_AS_TLS is true as gas support for TLS
      86     is detected by configure.  Override the definition to false.  */
      87  
      88  #undef HAVE_AS_TLS
      89  #define HAVE_AS_TLS 0
      90  
      91  /* Use standard DWARF numbering for DWARF debugging information.  */
      92  #define RS6000_USE_DWARF_NUMBERING
      93  
      94  #ifdef CRT_BEGIN
      95  /* This function is part of crtbegin*.o which is at the beginning of
      96     the link and is called from .fini which is usually toward the end
      97     of the executable.  Make it longcall so that we don't limit the
      98     text size of the executables to 32M.  */
      99  
     100  static void __do_global_dtors_aux (void) __attribute__ ((longcall));
     101  #endif	/* CRT_BEGIN */
     102  
     103  #ifdef CRT_END
     104  /* Similarly here.  This function resides in crtend*.o which is toward
     105     to end of the link and is called from .init which is at the
     106     beginning.  */
     107  
     108  static void __do_global_ctors_aux (void) __attribute__ ((longcall));
     109  #endif	/* CRT_END */