gcc/config/vxworks.h

   1 /* Common VxWorks target definitions for GNU compiler.
   2    Copyright (C) 1999-2018 Free Software Foundation, Inc.
   3    Contributed by Wind River Systems.
   4    Rewritten 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 /* Assert that we are targeting VxWorks.  */
  23 #undef TARGET_VXWORKS
  24 #define TARGET_VXWORKS 1
  25
  26 /* In kernel mode, VxWorks provides all the libraries itself, as well as
  27    the functionality of startup files, etc.  In RTP mode, it behaves more
  28    like a traditional Unix, with more external files.  Most of our specs
  29    must be aware of the difference.  */
  30
  31 /* We look for the VxWorks header files using the environment
  32    variables that are set in VxWorks to indicate the location of the
  33    system header files.  We use -idirafter so that the GCC's own
  34    header-file directories (containing <stddef.h>, etc.) come before
  35    the VxWorks system header directories.  */
  36
  37 /* Since we provide a default -isystem, expand -isystem on the command
  38    line early.  */
  39 #if TARGET_VXWORKS7
  40
  41 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  42 #define VXWORKS_ADDITIONAL_CPP_SPEC                     \
  43  "%{!nostdinc:                                          \
  44     %{isystem*}                                         \
  45     %{mrtp: -idirafter %:getenv(VSB_DIR /h)             \
  46             -idirafter %:getenv(VSB_DIR /share/h)       \
  47             -idirafter %:getenv(VSB_DIR /usr/h/public)  \
  48             -idirafter %:getenv(VSB_DIR /usr/h)         \
  49       ;:    -idirafter %:getenv(VSB_DIR /h)             \
  50             -idirafter %:getenv(VSB_DIR /share/h)       \
  51             -idirafter %:getenv(VSB_DIR /krnl/h/system) \
  52             -idirafter %:getenv(VSB_DIR /krnl/h/public)}}"
  53
  54 #else /* TARGET_VXWORKS7 */
  55
  56 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  57 #define VXWORKS_ADDITIONAL_CPP_SPEC             \
  58  "%{!nostdinc:                                  \
  59     %{isystem*}                                 \
  60     %{mrtp: -idirafter %:getenv(WIND_USR /h)    \
  61             -idirafter %:getenv(WIND_USR /h/wrn/coreip) \
  62       ;:    -idirafter %:getenv(WIND_BASE /target/h) \
  63             -idirafter %:getenv(WIND_BASE /target/h/wrn/coreip) \
  64 }}"
  65
  66 #endif
  67
  68 /* For VxWorks static rtps, the system provides libc_internal.a, a superset of
  69    libgcc.a that we need to use e.g. to satisfy references to __init and
  70    __fini.  We still want our libgcc to prevail for symbols it would provide
  71    (e.g. register save entry points), so re-place it here between libraries
  72    that might reference it and libc_internal.
  73
  74    In addition, some versions of VxWorks rely on explicit extra libraries for
  75    system calls and the set of base network libraries of common use varies
  76    across architectures.  The default settings defined here might be redefined
  77    by target specific port configuration files.  */
  78
  79 #define VXWORKS_SYSCALL_LIBS_RTP
  80
  81 #define VXWORKS_NET_LIBS_RTP "-lnet -ldsi"
  82
  83 #define VXWORKS_LIBS_RTP \
  84   VXWORKS_SYSCALL_LIBS_RTP " " VXWORKS_NET_LIBS_RTP " -lc -lgcc -lc_internal"
  85
  86 /* On Vx6 and previous, the libraries to pick up depends on the architecture,
  87    so cannot be defined for all archs at once.  On Vx7, a VSB is always needed
  88    and its structure is fixed and does not depend on the arch.  We can thus
  89    tell gcc where to look for when linking with RTP libraries.  Use
  90    STARTFILE_PREFIX_SPEC for this, instead of explicit -L options in LIB_SPEC,
  91    so they survive -nodefaultlibs.  */
  92
  93 /* On Vx7 RTP, we need to drag the __tls__ symbol to trigger initialization of
  94    tlsLib, responsible for TLS support by the OS.  */
  95
  96 #if TARGET_VXWORKS7
  97 #undef  STARTFILE_PREFIX_SPEC
  98 #define STARTFILE_PREFIX_SPEC "%:getenv(VSB_DIR /usr/lib/common)"
  99 #define TLS_SYM "-u __tls__"
 100 #else
 101 #define TLS_SYM ""
 102 #endif
 103
 104 #undef VXWORKS_LIB_SPEC
 105 #define VXWORKS_LIB_SPEC                                                \
 106 "%{mrtp:%{shared:-u " USER_LABEL_PREFIX "__init -u " USER_LABEL_PREFIX "__fini} \
 107         %{!shared:%{non-static:-u " USER_LABEL_PREFIX "_STI__6__rtld -ldl} \
 108                   " TLS_SYM " \
 109                   --start-group " VXWORKS_LIBS_RTP " --end-group}}"
 110
 111 /* The no-op spec for "-shared" below is present because otherwise GCC
 112    will treat it as an unrecognized option.  */
 113 #undef VXWORKS_LINK_SPEC
 114 #define VXWORKS_LINK_SPEC                               \
 115 "%{!mrtp:-r}                                            \
 116  %{!shared:                                             \
 117    %{mrtp:-q %{h*}                                      \
 118           %{R*} %{!T*: %(link_start) }                  \
 119           %(link_target) %(link_os)}}                   \
 120  %{v:-v}                                                \
 121  %{shared:-shared}                                      \
 122  %{Bstatic:-Bstatic}                                    \
 123  %{Bdynamic:-Bdynamic}                                  \
 124  %{!Xbind-lazy:-z now}                                  \
 125  %{Xbind-now:%{Xbind-lazy:                              \
 126    %e-Xbind-now and -Xbind-lazy are incompatible}}      \
 127  %{mrtp:%{!shared:%{!non-static:-static}                \
 128                   %{non-static:--force-dynamic --export-dynamic}}}"
 129
 130 #undef VXWORKS_LIBGCC_SPEC
 131 #define VXWORKS_LIBGCC_SPEC "-lgcc"
 132
 133 #undef VXWORKS_STARTFILE_SPEC
 134 #define VXWORKS_STARTFILE_SPEC "%{mrtp:%{!shared:-l:crt0.o}}"
 135 #define VXWORKS_ENDFILE_SPEC ""
 136
 137 /* Do VxWorks-specific parts of TARGET_OPTION_OVERRIDE.  */
 138
 139 #define VXWORKS_HAVE_TLS (TARGET_VXWORKS7 && TARGET_VXWORKS_RTP)
 140
 141 #undef VXWORKS_OVERRIDE_OPTIONS
 142 #define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
 143 extern void vxworks_override_options (void);
 144
 145 /* Whether the VxWorks variant and mode supports constructors/destructors
 146    placed in .ctors/.dtors section or if we should generate proxy functions
 147    for them, with special names which munch knows how to collect.  On most
 148    versions of VxWorks, only the RTP loader supports .ctors/.dtors sections,
 149    not the kernel module loader.  */
 150 #define TARGET_VXWORKS_HAVE_CTORS_DTORS TARGET_VXWORKS_RTP
 151
 152 /* Support for prioritized ctors/dtors is in sync with the support for sections
 153    on the VxWorks front, and is assumed to be provided by whatever linker level
 154    glue is required if we were configured with --enable-initfini-array.  */
 155 #define SUPPORTS_INIT_PRIORITY \
 156   (TARGET_VXWORKS_HAVE_CTORS_DTORS || HAVE_INITFINI_ARRAY_SUPPORT)
 157
 158 #if !HAVE_INITFINI_ARRAY_SUPPORT
 159 /* VxWorks requires special handling of constructors and destructors.
 160    All VxWorks configurations must use these functions.  */
 161 #undef TARGET_ASM_CONSTRUCTOR
 162 #define TARGET_ASM_CONSTRUCTOR vxworks_asm_out_constructor
 163 #undef TARGET_ASM_DESTRUCTOR
 164 #define TARGET_ASM_DESTRUCTOR vxworks_asm_out_destructor
 165 extern void vxworks_asm_out_constructor (rtx symbol, int priority);
 166 extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 167 #endif
 168
 169 /* Override the vxworks-dummy.h definitions.  TARGET_VXWORKS_RTP
 170    is defined by vxworks.opt.  */
 171 #undef VXWORKS_GOTT_BASE
 172 #define VXWORKS_GOTT_BASE "__GOTT_BASE__"
 173 #undef VXWORKS_GOTT_INDEX
 174 #define VXWORKS_GOTT_INDEX "__GOTT_INDEX__"
 175
 176 #undef PTRDIFF_TYPE
 177 #define PTRDIFF_TYPE (TARGET_VXWORKS64 ? "long int" : "int")
 178
 179 #undef SIZE_TYPE
 180 #define SIZE_TYPE (TARGET_VXWORKS64 ? "long unsigned int" : "unsigned int")
 181
 182 #undef TARGET_LIBC_HAS_FUNCTION
 183 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 184
 185 /* Both kernels and RTPs have the facilities required by this macro.  */
 186 #define TARGET_POSIX_IO
 187
 188 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS.  */
 189
 190 /* The VxWorks personality we rely on, controlling which sections of system
 191    headers files we trigger.  This might be redefined on targets where the
 192    base VxWorks environment doesn't come with a GNU toolchain.  */
 193
 194 #define VXWORKS_PERSONALITY "gnu"
 195
 196 #define VXWORKS_OS_CPP_BUILTINS()                                       \
 197   do                                                                    \
 198     {                                                                   \
 199       builtin_define ("__vxworks");                                     \
 200       builtin_define ("__VXWORKS__");                                   \
 201       builtin_assert ("system=unix");                                   \
 202       if (TARGET_VXWORKS_RTP)                                           \
 203         builtin_define ("__RTP__");                                     \
 204       else                                                              \
 205         builtin_define ("_WRS_KERNEL");                                 \
 206       builtin_define ("TOOL_FAMILY=" VXWORKS_PERSONALITY);              \
 207       builtin_define ("TOOL=" VXWORKS_PERSONALITY);                     \
 208       if (TARGET_VXWORKS7)                                              \
 209         {                                                               \
 210            builtin_define ("_VSB_CONFIG_FILE=<config/vsbConfig.h>");    \
 211                                                                         \
 212            /* _ALLOW_KEYWORD_MACROS is needed on VxWorks 7 to           \
 213               prevent compilation failures triggered by our             \
 214               definition of "inline" in ansidecl when "inline"          \
 215               is not a keyword.  */                                     \
 216            if (!flag_isoc99 && !c_dialect_cxx())                        \
 217              builtin_define ("_ALLOW_KEYWORD_MACROS");                  \
 218         }                                                               \
 219     }                                                                   \
 220   while (0)
 221
 222 #define VXWORKS_KIND VXWORKS_KIND_NORMAL
 223
 224 /* The diab linker does not handle .gnu_attribute sections.  */
 225 #undef HAVE_AS_GNU_ATTRIBUTE
 226
 227 /* We provide our own version of __clear_cache in libgcc, using a separate C
 228    file to facilitate #inclusion of VxWorks header files.  */
 229 #undef CLEAR_INSN_CACHE
 230 #define CLEAR_INSN_CACHE 1
 231
 232 /* Default dwarf control values, for non-gdb debuggers that come with
 233    VxWorks.  */
 234
 235 #undef VXWORKS_DWARF_VERSION_DEFAULT
 236 #define VXWORKS_DWARF_VERSION_DEFAULT (TARGET_VXWORKS7 ? 4 : 2)
 237
 238 #undef DWARF_GNAT_ENCODINGS_DEFAULT
 239 #define DWARF_GNAT_ENCODINGS_DEFAULT \
 240   (TARGET_VXWORKS7 ? DWARF_GNAT_ENCODINGS_MINIMAL : DWARF_GNAT_ENCODINGS_ALL)