gcc/config/rs6000/vxworks.h

   1 /* Definitions of target machine for GNU compiler.  Vxworks PowerPC version.
   2    Copyright (C) 1996-2019 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
  92 /* For RTPs, leverage linker relaxation.  This helps programs referring
  93    to, typically, kernel services too far away for short calls.  This is more
  94    precise than -mlongcall and can be overriden with -Wl,--no-relax.  */
  95 #define VXWORKS_RELAX_LINK_SPEC "%{mrtp:--relax}"
  96
  97 #undef  LINK_SPEC
  98 #define LINK_SPEC VXWORKS_LINK_SPEC " " VXWORKS_RELAX_LINK_SPEC
  99
 100 #undef  STARTFILE_SPEC
 101 #define STARTFILE_SPEC VXWORKS_STARTFILE_SPEC
 102 #undef  ENDFILE_SPEC
 103 #define ENDFILE_SPEC VXWORKS_ENDFILE_SPEC
 104
 105 /* There is no default multilib.  */
 106 #undef MULTILIB_DEFAULTS
 107
 108 #undef TARGET_DEFAULT
 109 #define TARGET_DEFAULT (MASK_EABI | MASK_STRICT_ALIGN)
 110
 111 #undef PROCESSOR_DEFAULT
 112 #define PROCESSOR_DEFAULT PROCESSOR_PPC604
 113
 114 /* Nor sdata, for kernel mode.  We use this in
 115    SUBSUBTARGET_INITIALIZE_OPTIONS, after rs6000_rtp has been initialized.  */
 116 #undef SDATA_DEFAULT_SIZE
 117 #define SDATA_DEFAULT_SIZE (TARGET_VXWORKS_RTP ? 8 : 0)
 118
 119 /* Enforce 16-byte alignment for the stack pointer, to permit general
 120    compliance with e.g. Altivec instructions requirements.  Make sure
 121    this isn't overruled by the EABI constraints.  */
 122
 123 #undef  STACK_BOUNDARY
 124 #define STACK_BOUNDARY (16*BITS_PER_UNIT)
 125
 126 #undef  PREFERRED_STACK_BOUNDARY
 127 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 128
 129 #undef  ABI_STACK_BOUNDARY
 130
 131 #undef RS6000_STARTING_FRAME_OFFSET
 132 #define RS6000_STARTING_FRAME_OFFSET                                    \
 133   (cfun->calls_alloca                                                   \
 134    ? RS6000_ALIGN (crtl->outgoing_args_size + RS6000_SAVE_AREA, 16)     \
 135    : (RS6000_ALIGN (crtl->outgoing_args_size, 16) + RS6000_SAVE_AREA))
 136
 137 #undef STACK_DYNAMIC_OFFSET
 138 #define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
 139    RS6000_ALIGN (crtl->outgoing_args_size.to_constant ()                \
 140                  + STACK_POINTER_OFFSET, 16)
 141
 142 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
 143 #define SUBSUBTARGET_OVERRIDE_OPTIONS           \
 144   do {                                          \
 145   if (!global_options_set.x_g_switch_value)     \
 146     g_switch_value = SDATA_DEFAULT_SIZE;        \
 147   VXWORKS_OVERRIDE_OPTIONS;                     \
 148   } while (0)
 149
 150 /* No _mcount profiling on VxWorks.  */
 151 #undef FUNCTION_PROFILER
 152 #define FUNCTION_PROFILER(FILE,LABELNO) VXWORKS_FUNCTION_PROFILER(FILE,LABELNO)
 153
 154 /* Define this to be nonzero if static stack checking is supported.  */
 155 #define STACK_CHECK_STATIC_BUILTIN 1
 156
 157 /* This platform supports the probing method of stack checking (RTP mode).
 158    8K is reserved in the stack to propagate exceptions in case of overflow.  */
 159 #define STACK_CHECK_PROTECT 8192