gcc/config/powerpcspe/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 /* Arrange to infer -DCPU, which VxWorks headers require, from -mcpu.  */
  64
  65 /* Different flavors of VxWorks expect different CPU values to designate SPE
  66    on 8548.  We define a dedicated macro for the base VxWorks here, which the
  67    AE configuration might also override.  */
  68
  69 #if TARGET_VXWORKS7
  70 #define VXCPU_FOR_8548 "PPCE500V2"
  71 #else
  72 #define VXCPU_FOR_8548 "PPC85XX"
  73 #endif
  74
  75 /* FIXME: The only reason we allow no -mcpu switch at all is because
  76    config-ml.in insists on a "." multilib. */
  77 #define CPP_SPEC \
  78 "%{!DCPU=*:               \
  79    %{mcpu=403 : -DCPU=PPC403  ; \
  80      mcpu=405 : -DCPU=PPC405  ; \
  81      mcpu=440 : -DCPU=PPC440  ; \
  82      mcpu=464 : -DCPU=PPC464  ; \
  83      mcpu=476 : -DCPU=PPC476  ; \
  84      mcpu=603 : -DCPU=PPC603  ; \
  85      mcpu=604 : -DCPU=PPC604  ; \
  86      mcpu=860 : -DCPU=PPC860  ; \
  87      mcpu=8540: -DCPU=PPC85XX ; \
  88      mcpu=8548: -DCPU=" VXCPU_FOR_8548 "; \
  89               : -DCPU=PPC604  }}" \
  90 VXWORKS_ADDITIONAL_CPP_SPEC
  91
  92 #define CC1_SPEC                                                \
  93 "%{G*} %{mno-sdata:-msdata=none} %{msdata:-msdata=default}      \
  94  %{mlittle|mlittle-endian:-mstrict-align}"
  95
  96 #define ASM_SPEC \
  97 "%(asm_cpu) \
  98  %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}} \
  99  %{mrelocatable} %{mrelocatable-lib} %{" FPIC_SPEC ":-K PIC} -mbig"
 100
 101 #undef  LIB_SPEC
 102 #define LIB_SPEC VXWORKS_LIB_SPEC
 103 #undef  LINK_SPEC
 104 #define LINK_SPEC VXWORKS_LINK_SPEC
 105 #undef  STARTFILE_SPEC
 106 #define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC
 107 #undef  ENDFILE_SPEC
 108 #define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC
 109
 110 /* There is no default multilib.  */
 111 #undef MULTILIB_DEFAULTS
 112
 113 #undef TARGET_DEFAULT
 114 #define TARGET_DEFAULT (MASK_EABI | MASK_STRICT_ALIGN)
 115
 116 #undef PROCESSOR_DEFAULT
 117 #define PROCESSOR_DEFAULT PROCESSOR_PPC604
 118
 119 /* Nor sdata, for kernel mode.  We use this in
 120    SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized.  */
 121 #undef SDATA_DEFAULT_SIZE
 122 #define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0)
 123
 124 /* Enforce 16bytes alignment for the stack pointer, to permit general
 125    compliance with e.g. Altivec instructions requirements.  Make sure
 126    this isn't overruled by the EABI constraints.  */
 127
 128 #undef  STACK_BOUNDARY
 129 #define STACK_BOUNDARY (16*BITS_PER_UNIT)
 130
 131 #undef  PREFERRED_STACK_BOUNDARY
 132 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 133
 134 #undef  ABI_STACK_BOUNDARY
 135
 136 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
 137 #define SUBSUBTARGET_OVERRIDE_OPTIONS           \
 138   do {                                          \
 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)
 147
 148 /* Define this to be nonzero if static stack checking is supported.  */
 149 #define STACK_CHECK_STATIC_BUILTIN 1
 150
 151 /* This platform supports the probing method of stack checking (RTP mode).
 152    8K is reserved in the stack to propagate exceptions in case of overflow.  */
 153 #define STACK_CHECK_PROTECT 8192