gcc/config/rs6000/vxworks.h

   1 /* Definitions of target machine for GNU compiler.  Vxworks PowerPC version.
   2    Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2007, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4    Contributed by CodeSourcery, LLC.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 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 /* Note to future editors: VxWorks is mostly an EABI target.  We do
  23    not use rs6000/eabi.h because we would have to override most of
  24    it anyway.  However, if you change that file, consider making
  25    analogous changes here too.  */
  26
  27 #undef TARGET_VERSION
  28 #define TARGET_VERSION fprintf (stderr, " (PowerPC VxWorks)");
  29
  30 /* CPP predefined macros.  */
  31
  32 #undef TARGET_OS_CPP_BUILTINS
  33 #define TARGET_OS_CPP_BUILTINS()                \
  34   do                                            \
  35     {                                           \
  36       builtin_define ("__ppc");                 \
  37       builtin_define ("__PPC__");               \
  38       builtin_define ("__EABI__");              \
  39       builtin_define ("__ELF__");               \
  40       if (!TARGET_SOFT_FLOAT)                   \
  41         builtin_define ("__hardfp");            \
  42                                                 \
  43       /* C89 namespace violation! */            \
  44       builtin_define ("CPU_FAMILY=PPC");        \
  45                                                 \
  46       VXWORKS_OS_CPP_BUILTINS ();               \
  47     }           \
  48   while (0)
  49
  50 /* Only big endian PPC is supported by VxWorks.  */
  51 #undef BYTES_BIG_ENDIAN
  52 #define BYTES_BIG_ENDIAN 1
  53
  54 /* We have to kill off the entire specs set created by rs6000/sysv4.h
  55    and substitute our own set.  The top level vxworks.h has done some
  56    of this for us.  */
  57
  58 #undef SUBTARGET_EXTRA_SPECS
  59 #undef CPP_SPEC
  60 #undef CC1_SPEC
  61 #undef ASM_SPEC
  62
  63 #define SUBTARGET_EXTRA_SPECS /* none needed */
  64
  65 /* FIXME: The only reason we allow no -mcpu switch at all is because
  66    config-ml.in insists on a "." multilib. */
  67 #define CPP_SPEC \
  68 "%{!DCPU=*:               \
  69    %{mcpu=403 : -DCPU=PPC403  ; \
  70      mcpu=405 : -DCPU=PPC405  ; \
  71      mcpu=440 : -DCPU=PPC440  ; \
  72      mcpu=464 : -DCPU=PPC464  ; \
  73      mcpu=476 : -DCPU=PPC476  ; \
  74      mcpu=603 : -DCPU=PPC603  ; \
  75      mcpu=604 : -DCPU=PPC604  ; \
  76      mcpu=860 : -DCPU=PPC860  ; \
  77      mcpu=8540: -DCPU=PPC85XX ; \
  78               : -DCPU=PPC604  }}" \
  79 VXWORKS_ADDITIONAL_CPP_SPEC
  80
  81 #define CC1_SPEC                                                \
  82 "%{G*} %{mno-sdata:-msdata=none} %{msdata:-msdata=default}      \
  83  %{mlittle|mlittle-endian:-mstrict-align}"
  84
  85 #define ASM_SPEC \
  86 "%(asm_cpu) \
  87  %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
  88  %{mrelocatable} %{mrelocatable-lib} %{fpic:-K PIC} %{fPIC:-K PIC} -mbig"
  89
  90 #undef  LIB_SPEC
  91 #define LIB_SPEC VXWORKS_LIB_SPEC
  92 #undef  LINK_SPEC
  93 #define LINK_SPEC VXWORKS_LINK_SPEC
  94 #undef  STARTFILE_SPEC
  95 #define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC
  96 #undef  ENDFILE_SPEC
  97 #define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC
  98
  99 /* There is no default multilib.  */
 100 #undef MULTILIB_DEFAULTS
 101
 102 #undef TARGET_DEFAULT
 103 #define TARGET_DEFAULT \
 104   (MASK_POWERPC | MASK_NEW_MNEMONICS | MASK_EABI | MASK_STRICT_ALIGN)
 105
 106 #undef PROCESSOR_DEFAULT
 107 #define PROCESSOR_DEFAULT PROCESSOR_PPC604
 108
 109 /* Nor sdata, for kernel mode.  We use this in
 110    SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized.  */
 111 #undef SDATA_DEFAULT_SIZE
 112 #define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0)
 113
 114 /* Enforce 16bytes alignment for the stack pointer, to permit general
 115    compliance with e.g. Altivec instructions requirements.  Make sure
 116    this isn't overruled by the EABI constraints.  */
 117
 118 #undef  STACK_BOUNDARY
 119 #define STACK_BOUNDARY (16*BITS_PER_UNIT)
 120
 121 #undef  PREFERRED_STACK_BOUNDARY
 122 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 123
 124 #undef  ABI_STACK_BOUNDARY
 125
 126 /* Make -mcpu=8540 imply SPE.  ISEL is automatically enabled, the
 127    others must be done by hand.  Handle -mrtp.  Disable -fPIC
 128    for -mrtp - the VxWorks PIC model is not compatible with it.  */
 129 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
 130 #define SUBSUBTARGET_OVERRIDE_OPTIONS           \
 131   do {                                          \
 132     if (TARGET_E500)                            \
 133       {                                         \
 134         rs6000_spe = 1;                         \
 135         rs6000_spe_abi = 1;                     \
 136         rs6000_float_gprs = 1;                  \
 137       }                                         \
 138                                                 \
 139   if (!global_options_set.x_g_switch_value)     \
 140     g_switch_value = SDATA_DEFAULT_SIZE;        \
 141   VXWORKS_OVERRIDE_OPTIONS;                     \
 142   } while (0)
 143
 144 /* No _mcount profiling on VxWorks.  */
 145 #undef FUNCTION_PROFILER
 146 #define FUNCTION_PROFILER(FILE,LABELNO) VXWORKS_FUNCTION_PROFILER(FILE,LABELNO)