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 /* If TARGET_VXWORKS7 is undefined, then we're not targeting it.  */
  27 #ifndef TARGET_VXWORKS7
  28 #define TARGET_VXWORKS7 0
  29 #endif
  30
  31 /* In kernel mode, VxWorks provides all the libraries itself, as well as
  32    the functionality of startup files, etc.  In RTP mode, it behaves more
  33    like a traditional Unix, with more external files.  Most of our specs
  34    must be aware of the difference.  */
  35
  36 /* We look for the VxWorks header files using the environment
  37    variables that are set in VxWorks to indicate the location of the
  38    system header files.  We use -idirafter so that the GCC's own
  39    header-file directories (containing <stddef.h>, etc.) come before
  40    the VxWorks system header directories.  */
  41
  42 /* Since we provide a default -isystem, expand -isystem on the command
  43    line early.  */
  44 #if TARGET_VXWORKS7
  45
  46 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  47 #define VXWORKS_ADDITIONAL_CPP_SPEC                     \
  48  "%{!nostdinc:                                          \
  49     %{isystem*}                                         \
  50     %{mrtp: -idirafter %:getenv(VSB_DIR /h)             \
  51             -idirafter %:getenv(VSB_DIR /share/h)       \
  52             -idirafter %:getenv(VSB_DIR /usr/h/public)  \
  53             -idirafter %:getenv(VSB_DIR /usr/h)         \
  54       ;:    -idirafter %:getenv(VSB_DIR /h)             \
  55             -idirafter %:getenv(VSB_DIR /share/h)       \
  56             -idirafter %:getenv(VSB_DIR /krnl/h/system) \
  57             -idirafter %:getenv(VSB_DIR /krnl/h/public)}}"
  58
  59 #else /* TARGET_VXWORKS7 */
  60
  61 #undef VXWORKS_ADDITIONAL_CPP_SPEC
  62 #define VXWORKS_ADDITIONAL_CPP_SPEC             \
  63  "%{!nostdinc:                                  \
  64     %{isystem*} -idirafter                      \
  65     %{mrtp: %:getenv(WIND_USR /h)               \
  66       ;:    %:getenv(WIND_BASE /target/h)}}"
  67
  68 #endif
  69
  70 /* The references to __init and __fini will be satisfied by
  71    libc_internal.a, and some versions of VxWorks rely on explicit
  72    extra libraries for system calls.  */
  73
  74 #define VXWORKS_SYSCALL_LIBS_RTP
  75
  76 #define VXWORKS_LIBS_RTP \
  77   VXWORKS_SYSCALL_LIBS_RTP " -lc -lgcc -lc_internal -lnet -ldsi"
  78
  79 /* On Vx6 and previous, the libraries to pick up depends on the architecture,
  80    so cannot be defined for all archs at once.  On Vx7, a VSB is always needed
  81    and its structure is fixed and does not depend on the arch.  We can thus
  82    tell gcc where to look for when linking with RTP libraries.  */
  83
  84 /* On Vx7 RTP, we need to drag the __tls__ symbol to trigger initialization of
  85    tlsLib, responsible for TLS support by the OS.  */
  86
  87 #if TARGET_VXWORKS7
  88 #define VXWORKS_LIBS_DIR_RTP "-L%:getenv(VSB_DIR /usr/lib/common)"
  89 #define TLS_SYM "-u __tls__"
  90 #else
  91 #define VXWORKS_LIBS_DIR_RTP ""
  92 #define TLS_SYM ""
  93 #endif
  94
  95 #undef VXWORKS_LIB_SPEC
  96 #define VXWORKS_LIB_SPEC                                                \
  97 "%{mrtp:%{shared:-u " USER_LABEL_PREFIX "__init -u " USER_LABEL_PREFIX "__fini} \
  98         %{!shared:%{non-static:-u " USER_LABEL_PREFIX "_STI__6__rtld -ldl} \
  99                   " TLS_SYM " \
 100                   --start-group " VXWORKS_LIBS_RTP " --end-group} \
 101         " VXWORKS_LIBS_DIR_RTP "}"
 102
 103 /* The no-op spec for "-shared" below is present because otherwise GCC
 104    will treat it as an unrecognized option.  */
 105 #undef VXWORKS_LINK_SPEC
 106 #define VXWORKS_LINK_SPEC                               \
 107 "%{!mrtp:-r}                                            \
 108  %{!shared:                                             \
 109    %{mrtp:-q %{h*}                                      \
 110           %{R*} %{!T*: %(link_start) }                  \
 111           %(link_target) %(link_os)}}                   \
 112  %{v:-v}                                                \
 113  %{shared:-shared}                                      \
 114  %{Bstatic:-Bstatic}                                    \
 115  %{Bdynamic:-Bdynamic}                                  \
 116  %{!Xbind-lazy:-z now}                                  \
 117  %{Xbind-now:%{Xbind-lazy:                              \
 118    %e-Xbind-now and -Xbind-lazy are incompatible}}      \
 119  %{mrtp:%{!shared:%{!non-static:-static}                \
 120                   %{non-static:--force-dynamic --export-dynamic}}}"
 121
 122 /* For VxWorks static rtps, the system provides libc_internal.a, a superset
 123    of libgcc.a that we want to use.  Make sure not to dynamically export any
 124    of its symbols, though, and always look for libgcc.a first so that we get
 125    the latest versions of the GNU intrinsics during our builds.  */
 126 #undef VXWORKS_LIBGCC_SPEC
 127 #define VXWORKS_LIBGCC_SPEC \
 128   "-lgcc %{mrtp:%{!shared:--exclude-libs=libc_internal,libgcc -lc_internal}}"
 129
 130 #undef VXWORKS_STARTFILE_SPEC
 131 #define VXWORKS_STARTFILE_SPEC "%{mrtp:%{!shared:-l:crt0.o}}"
 132 #define VXWORKS_ENDFILE_SPEC ""
 133
 134 /* Do VxWorks-specific parts of TARGET_OPTION_OVERRIDE.  */
 135
 136 #define VXWORKS_HAVE_TLS (TARGET_VXWORKS7 && TARGET_VXWORKS_RTP)
 137
 138 #undef VXWORKS_OVERRIDE_OPTIONS
 139 #define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
 140 extern void vxworks_override_options (void);
 141
 142 /* Only RTPs support prioritized constructors and destructors:
 143    the implementation relies on numbered .ctors* sections.  */
 144 #define SUPPORTS_INIT_PRIORITY TARGET_VXWORKS_RTP
 145
 146 /* VxWorks requires special handling of constructors and destructors.
 147    All VxWorks configurations must use these functions.  */
 148 #undef TARGET_ASM_CONSTRUCTOR
 149 #define TARGET_ASM_CONSTRUCTOR vxworks_asm_out_constructor
 150 #undef TARGET_ASM_DESTRUCTOR
 151 #define TARGET_ASM_DESTRUCTOR vxworks_asm_out_destructor
 152 extern void vxworks_asm_out_constructor (rtx symbol, int priority);
 153 extern void vxworks_asm_out_destructor (rtx symbol, int priority);
 154
 155 /* Override the vxworks-dummy.h definitions.  TARGET_VXWORKS_RTP
 156    is defined by vxworks.opt.  */
 157 #undef VXWORKS_GOTT_BASE
 158 #define VXWORKS_GOTT_BASE "__GOTT_BASE__"
 159 #undef VXWORKS_GOTT_INDEX
 160 #define VXWORKS_GOTT_INDEX "__GOTT_INDEX__"
 161
 162 #undef PTRDIFF_TYPE
 163 #define PTRDIFF_TYPE "int"
 164
 165 #undef SIZE_TYPE
 166 #define SIZE_TYPE "unsigned int"
 167
 168 #undef TARGET_LIBC_HAS_FUNCTION
 169 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
 170
 171 /* Both kernels and RTPs have the facilities required by this macro.  */
 172 #define TARGET_POSIX_IO
 173
 174 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS.  */
 175 #define VXWORKS_OS_CPP_BUILTINS()                                       \
 176   do                                                                    \
 177     {                                                                   \
 178       builtin_define ("__vxworks");                                     \
 179       builtin_define ("__VXWORKS__");                                   \
 180       builtin_assert ("system=unix");                                   \
 181       if (TARGET_VXWORKS_RTP)                                           \
 182         builtin_define ("__RTP__");                                     \
 183       else                                                              \
 184         builtin_define ("_WRS_KERNEL");                                 \
 185       builtin_define ("_VX_TOOL_FAMILY=gnu");                           \
 186       builtin_define ("_VX_TOOL=gnu");                                  \
 187       if (TARGET_VXWORKS7)                                              \
 188         {                                                               \
 189            builtin_define ("_VSB_CONFIG_FILE=<config/vsbConfig.h>");    \
 190                                                                         \
 191            /* _ALLOW_KEYWORD_MACROS is needed on VxWorks 7 to           \
 192               prevent compilation failures triggered by our             \
 193               definition of "inline" in ansidecl when "inline"          \
 194               is not a keyword.  */                                     \
 195            if (!flag_isoc99 && !c_dialect_cxx())                        \
 196              builtin_define ("_ALLOW_KEYWORD_MACROS");                  \
 197         }                                                               \
 198     }                                                                   \
 199   while (0)
 200
 201 #define VXWORKS_KIND VXWORKS_KIND_NORMAL
 202
 203 /* The diab linker does not handle .gnu_attribute sections.  */
 204 #undef HAVE_AS_GNU_ATTRIBUTE
 205
 206 /* Default dwarf control values, for non-gdb debuggers that come with
 207    VxWorks.  */
 208
 209 #undef VXWORKS_DWARF_VERSION_DEFAULT
 210 #define VXWORKS_DWARF_VERSION_DEFAULT (TARGET_VXWORKS7 ? 4 : 2)
 211
 212 #undef DWARF_GNAT_ENCODINGS_DEFAULT
 213 #define DWARF_GNAT_ENCODINGS_DEFAULT \
 214   (TARGET_VXWORKS7 ? DWARF_GNAT_ENCODINGS_MINIMAL : DWARF_GNAT_ENCODINGS_ALL)