gcc/config/rs6000/vxworks.h

   1 /* Definitions of target machine for GNU compiler.  Vxworks PowerPC version.
   2    Copyright (C) 1996-2018 Free Software Foundation, Inc.
   3    Contributed by CodeSourcery, LLC.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Note to future editors: VxWorks is mostly an EABI target.  We do
  22    not use rs6000/eabi.h because we would have to override most of
  23    it anyway.  However, if you change that file, consider making
  24    analogous changes here too.  */
  25
  26 /* CPP predefined macros.  */
  27
  28 #undef TARGET_OS_CPP_BUILTINS
  29 #define TARGET_OS_CPP_BUILTINS()                \
  30   do                                            \
  31     {                                           \
  32       builtin_define ("__ppc");                 \
  33       builtin_define ("__PPC__");               \
  34       builtin_define ("__EABI__");              \
  35       builtin_define ("__ELF__");               \
  36       if (!TARGET_SOFT_FLOAT)                   \
  37         builtin_define ("__hardfp");            \
  38                                                 \
  39       /* C89 namespace violation! */            \
  40       builtin_define ("CPU_FAMILY=PPC");        \
  41                                                 \
  42       VXWORKS_OS_CPP_BUILTINS ();               \
  43     }           \
  44   while (0)
  45
  46 /* Only big endian PPC is supported by VxWorks.  */
  47 #undef BYTES_BIG_ENDIAN
  48 #define BYTES_BIG_ENDIAN 1
  49 #undef WORDS_BIG_ENDIAN
  50 #define WORDS_BIG_ENDIAN 1
  51
  52 /* We have to kill off the entire specs set created by rs6000/sysv4.h
  53    and substitute our own set.  The top level vxworks.h has done some
  54    of this for us.  */
  55
  56 #undef SUBTARGET_EXTRA_SPECS
  57 #undef CPP_SPEC
  58 #undef CC1_SPEC
  59 #undef ASM_SPEC
  60
  61 #define SUBTARGET_EXTRA_SPECS /* none needed */
  62
  63 /* FIXME: The only reason we allow no -mcpu switch at all is because
  64    config-ml.in insists on a "." multilib. */
  65 #define CPP_SPEC \
  66 "%{!DCPU=*:               \
  67    %{mcpu=403 : -DCPU=PPC403  ; \
  68      mcpu=405 : -DCPU=PPC405  ; \
  69      mcpu=440 : -DCPU=PPC440  ; \
  70      mcpu=464 : -DCPU=PPC464  ; \
  71      mcpu=476 : -DCPU=PPC476  ; \
  72      mcpu=603 : -DCPU=PPC603  ; \
  73      mcpu=604 : -DCPU=PPC604  ; \
  74      mcpu=860 : -DCPU=PPC860  ; \
  75      mcpu=8540: -DCPU=PPC85XX ; \
  76      mcpu=8548: -DCPU=PPC85XX ; \
  77               : -DCPU=PPC604  }}" \
  78 VXWORKS_ADDITIONAL_CPP_SPEC
  79
  80 #define CC1_SPEC                                                \
  81 "%{G*} %{mno-sdata:-msdata=none} %{msdata:-msdata=default}      \
  82  %{mlittle|mlittle-endian:-mstrict-align}"
  83
  84 #define ASM_SPEC \
  85 "%(asm_cpu) \
  86  %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
  87  %{mrelocatable} %{mrelocatable-lib} %{" FPIC_SPEC ":-K PIC} -mbig"
  88
  89 #undef  LIB_SPEC
  90 #define LIB_SPEC VXWORKS_LIB_SPEC
  91 #undef  LINK_SPEC
  92 #define LINK_SPEC VXWORKS_LINK_SPEC
  93 #undef  STARTFILE_SPEC
  94 #define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC
  95 #undef  ENDFILE_SPEC
  96 #define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC
  97
  98 /* There is no default multilib.  */
  99 #undef MULTILIB_DEFAULTS
 100
 101 #undef TARGET_DEFAULT
 102 #define TARGET_DEFAULT (MASK_EABI | MASK_STRICT_ALIGN)
 103
 104 #undef PROCESSOR_DEFAULT
 105 #define PROCESSOR_DEFAULT PROCESSOR_PPC604
 106
 107 /* Nor sdata, for kernel mode.  We use this in
 108    SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized.  */
 109 #undef SDATA_DEFAULT_SIZE
 110 #define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0)
 111
 112 /* Enforce 16bytes alignment for the stack pointer, to permit general
 113    compliance with e.g. Altivec instructions requirements.  Make sure
 114    this isn't overruled by the EABI constraints.  */
 115
 116 #undef  STACK_BOUNDARY
 117 #define STACK_BOUNDARY (16*BITS_PER_UNIT)
 118
 119 #undef  PREFERRED_STACK_BOUNDARY
 120 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 121
 122 #undef  ABI_STACK_BOUNDARY
 123
 124 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
 125 #define SUBSUBTARGET_OVERRIDE_OPTIONS           \
 126   do {                                          \
 127   if (!global_options_set.x_g_switch_value)     \
 128     g_switch_value = SDATA_DEFAULT_SIZE;        \
 129   VXWORKS_OVERRIDE_OPTIONS;                     \
 130   } while (0)
 131
 132 /* No _mcount profiling on VxWorks.  */
 133 #undef FUNCTION_PROFILER
 134 #define FUNCTION_PROFILER(FILE,LABELNO) VXWORKS_FUNCTION_PROFILER(FILE,LABELNO)
 135
 136 /* Define this to be nonzero if static stack checking is supported.  */
 137 #define STACK_CHECK_STATIC_BUILTIN 1
 138
 139 /* This platform supports the probing method of stack checking (RTP mode).
 140    8K is reserved in the stack to propagate exceptions in case of overflow.  */
 141 #define STACK_CHECK_PROTECT 8192