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1 /* Common VxWorks target definitions for GNU compiler.
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2 Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007
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3 Free Software Foundation, Inc.
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4 Contributed by Wind River Systems.
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5 Rewritten by CodeSourcery, LLC.
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with GCC; see the file COPYING3. If not see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 /* Assert that we are targetting VxWorks. */
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24 #undef TARGET_VXWORKS
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25 #define TARGET_VXWORKS 1
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26
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27 /* In kernel mode, VxWorks provides all the libraries itself, as well as
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28 the functionality of startup files, etc. In RTP mode, it behaves more
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29 like a traditional Unix, with more external files. Most of our specs
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30 must be aware of the difference. */
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31
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32 /* We look for the VxWorks header files using the environment
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33 variables that are set in VxWorks to indicate the location of the
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34 system header files. We use -idirafter so that the GCC's own
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35 header-file directories (containing <stddef.h>, etc.) come before
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36 the VxWorks system header directories. */
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37
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38 /* Since we provide a default -isystem, expand -isystem on the command
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39 line early. */
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40 #undef VXWORKS_ADDITIONAL_CPP_SPEC
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41 #define VXWORKS_ADDITIONAL_CPP_SPEC \
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42 "%{!nostdinc: \
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43 %{isystem*} -idirafter \
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44 %{mrtp: %:getenv(WIND_USR /h) \
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45 ;: %:getenv(WIND_BASE /target/h)}}"
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46
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47 /* The references to __init and __fini will be satisfied by
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48 libc_internal.a. */
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49 #undef VXWORKS_LIB_SPEC
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50 #define VXWORKS_LIB_SPEC \
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51 "%{mrtp:%{shared:-u " USER_LABEL_PREFIX "__init -u " USER_LABEL_PREFIX "__fini} \
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52 %{!shared:%{non-static:-u " USER_LABEL_PREFIX "_STI__6__rtld -ldl} \
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53 --start-group -lc -lgcc -lc_internal -lnet -ldsi \
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54 --end-group}}"
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55
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56 /* The no-op spec for "-shared" below is present because otherwise GCC
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57 will treat it as an unrecognized option. */
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58 #undef VXWORKS_LINK_SPEC
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59 #define VXWORKS_LINK_SPEC \
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60 "%{!mrtp:-r} \
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61 %{!shared: \
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62 %{mrtp:-q %{h*} \
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63 %{R*} %{!Wl,-T*: %{!T*: %(link_start) }} \
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64 %(link_target) %(link_os)}} \
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65 %{v:-v} \
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66 %{shared:-shared} \
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67 %{Bstatic:-Bstatic} \
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68 %{Bdynamic:-Bdynamic} \
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69 %{!Xbind-lazy:-z now} \
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70 %{Xbind-now:%{Xbind-lazy: \
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71 %e-Xbind-now and -Xbind-lazy are incompatible}} \
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72 %{mrtp:%{!shared:%{!non-static:-static} \
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73 %{non-static:--force-dynamic --export-dynamic}}}"
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74
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75 /* For VxWorks, the system provides libc_internal.a. This is a superset
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76 of libgcc.a; we want to use it. Make sure not to dynamically export
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77 any of its symbols, though. Always look for libgcc.a first so that
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78 we get the latest versions of the GNU intrinsics during our builds. */
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79 #undef VXWORKS_LIBGCC_SPEC
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80 #define VXWORKS_LIBGCC_SPEC \
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81 "-lgcc %{mrtp:--exclude-libs=libc_internal,libgcc -lc_internal}"
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82
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83 #undef VXWORKS_STARTFILE_SPEC
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84 #define VXWORKS_STARTFILE_SPEC "%{mrtp:%{!shared:-l:crt0.o}}"
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85 #define VXWORKS_ENDFILE_SPEC ""
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86
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87 /* Do VxWorks-specific parts of OVERRIDE_OPTIONS. */
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88 #undef VXWORKS_OVERRIDE_OPTIONS
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89 #define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
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90 extern void vxworks_override_options (void);
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91
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92 /* Only RTPs support prioritized constructors and destructors:
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93 the implementation relies on numbered .ctors* sections. */
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94 #define SUPPORTS_INIT_PRIORITY TARGET_VXWORKS_RTP
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95
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96 /* VxWorks requires special handling of constructors and destructors.
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97 All VxWorks configurations must use these functions. */
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98 #undef TARGET_ASM_CONSTRUCTOR
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99 #define TARGET_ASM_CONSTRUCTOR vxworks_asm_out_constructor
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100 #undef TARGET_ASM_DESTRUCTOR
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101 #define TARGET_ASM_DESTRUCTOR vxworks_asm_out_destructor
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102 extern void vxworks_asm_out_constructor (rtx symbol, int priority);
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103 extern void vxworks_asm_out_destructor (rtx symbol, int priority);
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104
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105 /* Override the vxworks-dummy.h definitions. TARGET_VXWORKS_RTP
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106 is defined by vxworks.opt. */
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107 #undef VXWORKS_GOTT_BASE
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108 #define VXWORKS_GOTT_BASE "__GOTT_BASE__"
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109 #undef VXWORKS_GOTT_INDEX
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110 #define VXWORKS_GOTT_INDEX "__GOTT_INDEX__"
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111
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112 /* As for svr4.h (which not all VxWorks targets include). */
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113 #undef PTRDIFF_TYPE
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114 #define PTRDIFF_TYPE "int"
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115
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116 #undef SIZE_TYPE
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117 #define SIZE_TYPE "unsigned int"
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118
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119 /* Both kernels and RTPs have the facilities required by this macro. */
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120 #define TARGET_POSIX_IO
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121
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122 /* A VxWorks implementation of TARGET_OS_CPP_BUILTINS. */
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123 #define VXWORKS_OS_CPP_BUILTINS() \
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124 do \
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125 { \
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126 builtin_define ("__vxworks"); \
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127 builtin_define ("__VXWORKS__"); \
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128 builtin_assert ("system=unix"); \
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129 if (TARGET_VXWORKS_RTP) \
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130 builtin_define ("__RTP__"); \
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131 else \
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132 builtin_define ("_WRS_KERNEL"); \
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133 } \
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134 while (0)
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135
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136 #define VXWORKS_KIND VXWORKS_KIND_NORMAL
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137
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138 /* The diab linker does not handle .gnu_attribute sections. */
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139 #undef HAVE_AS_GNU_ATTRIBUTE
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