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1 /* Base configuration file for all OpenBSD targets.
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2 Copyright (C) 1999, 2000, 2004, 2005, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 /* Common OpenBSD configuration.
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21 All OpenBSD architectures include this file, which is intended as
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22 a repository for common defines.
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23
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24 Some defines are common to all architectures, a few of them are
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25 triggered by OBSD_* guards, so that we won't override architecture
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26 defaults by mistakes.
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27
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28 OBSD_HAS_CORRECT_SPECS:
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29 another mechanism provides correct specs already.
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30 OBSD_NO_DYNAMIC_LIBRARIES:
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31 no implementation of dynamic libraries.
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32 OBSD_OLD_GAS:
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33 older flavor of gas which needs help for PIC.
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34 OBSD_HAS_DECLARE_FUNCTION_NAME, OBSD_HAS_DECLARE_FUNCTION_SIZE,
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35 OBSD_HAS_DECLARE_OBJECT:
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36 PIC support, FUNCTION_NAME/FUNCTION_SIZE are independent, whereas
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37 the corresponding logic for OBJECTS is necessarily coupled.
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38
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39 There are also a few `default' defines such as ASM_WEAKEN_LABEL,
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40 intended as common ground for arch that don't provide
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41 anything suitable. */
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42
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43 /* OPENBSD_NATIVE is defined only when gcc is configured as part of
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44 the OpenBSD source tree, specifically through Makefile.bsd-wrapper.
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45
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46 In such a case the include path can be trimmed as there is no
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47 distinction between system includes and gcc includes. */
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48
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49 /* This configuration method, namely Makefile.bsd-wrapper and
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50 OPENBSD_NATIVE is NOT recommended for building cross-compilers. */
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51
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52 #ifdef OPENBSD_NATIVE
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53
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54 /* The compiler is configured with ONLY the gcc/g++ standard headers. */
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55 #undef INCLUDE_DEFAULTS
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56 #define INCLUDE_DEFAULTS \
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57 { \
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58 { GPLUSPLUS_INCLUDE_DIR, "G++", 1, 1 }, \
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59 { GPLUSPLUS_TOOL_INCLUDE_DIR, "G++", 1, 1 }, \
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60 { GPLUSPLUS_BACKWARD_INCLUDE_DIR, "G++", 1, 1 }, \
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61 { STANDARD_INCLUDE_DIR, STANDARD_INCLUDE_COMPONENT, 0, 0 }, \
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62 { 0, 0, 0, 0 } \
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63 }
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64
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65 /* Under OpenBSD, the normal location of the various *crt*.o files is the
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66 /usr/lib directory. */
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67 #undef STANDARD_STARTFILE_PREFIX
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68 #define STANDARD_STARTFILE_PREFIX "/usr/local/lib/"
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69
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70 #endif
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71
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72
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73 /* Controlling the compilation driver. */
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74 /* TARGET_OS_CPP_BUILTINS() common to all OpenBSD targets. */
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75 #define OPENBSD_OS_CPP_BUILTINS() \
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76 do \
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77 { \
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78 builtin_define ("__OpenBSD__"); \
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79 builtin_define ("__unix__"); \
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80 builtin_define ("__ANSI_COMPAT"); \
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81 builtin_assert ("system=unix"); \
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82 builtin_assert ("system=bsd"); \
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83 builtin_assert ("system=OpenBSD"); \
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84 } \
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85 while (0)
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86
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87 /* CPP_SPEC appropriate for OpenBSD. We deal with -posix and -pthread.
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88 XXX the way threads are handled currently is not very satisfying,
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89 since all code must be compiled with -pthread to work.
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90 This two-stage defines makes it easy to pick that for targets that
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91 have subspecs. */
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92 #ifdef CPP_CPU_SPEC
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93 #define OBSD_CPP_SPEC "%(cpp_cpu) %{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
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94 #else
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95 #define OBSD_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_POSIX_THREADS}"
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96 #endif
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97
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98 /* LIB_SPEC appropriate for OpenBSD. */
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99 #ifdef HAS_LIBC_R
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100 /* -lc(_r)?(_p)?, select _r for threads, and _p for p or pg. */
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101 # define OBSD_LIB_SPEC "%{!shared:-lc%{pthread:_r}%{p:_p}%{!p:%{pg:_p}}}"
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102 #else
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103 /* Include -lpthread if -pthread is specified on the command line. */
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104 # define OBSD_LIB_SPEC "%{!shared:%{pthread:-lpthread%{p:_p}%{!p:%{pg:_p}}}} %{!shared:-lc%{p:_p}%{!p:%{pg:_p}}}"
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105 #endif
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106
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107
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108 #ifndef OBSD_HAS_CORRECT_SPECS
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109
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110 #ifndef OBSD_NO_DYNAMIC_LIBRARIES
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111 #undef SWITCH_TAKES_ARG
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112 #define SWITCH_TAKES_ARG(CHAR) \
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113 (DEFAULT_SWITCH_TAKES_ARG (CHAR) \
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114 || (CHAR) == 'R')
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115 #endif
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116
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117 #undef CPP_SPEC
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118 #define CPP_SPEC OBSD_CPP_SPEC
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119
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120 #ifdef OBSD_OLD_GAS
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121 /* ASM_SPEC appropriate for OpenBSD. For some architectures, OpenBSD
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122 still uses a special flavor of gas that needs to be told when generating
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123 pic code. */
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124 #undef ASM_SPEC
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125 #define ASM_SPEC "%{fpic|fpie:-k} %{fPIC|fPIE:-k -K}"
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126 #endif
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127
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128 /* Since we use gas, stdin -> - is a good idea. */
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129 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
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130
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131 /* LINK_SPEC appropriate for OpenBSD. Support for GCC options
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132 -static, -assert, and -nostdlib. */
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133 #undef LINK_SPEC
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134 #ifdef OBSD_NO_DYNAMIC_LIBRARIES
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135 #define LINK_SPEC \
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136 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{assert*}"
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137 #else
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138 #define LINK_SPEC \
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139 "%{g:%{!nostdlib:-L/usr/lib/debug}} %{!shared:%{!nostdlib:%{!r*:%{!e*:-e start}}}} %{shared:-Bshareable -x} -dc -dp %{R*} %{static:-Bstatic} %{assert*}"
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140 #endif
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141
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142 #undef LIB_SPEC
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143 #define LIB_SPEC OBSD_LIB_SPEC
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144 #endif
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145
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146
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147 /* Runtime target specification. */
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148
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149 /* Miscellaneous parameters. */
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150
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151 /* Controlling debugging info: dbx options. */
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152
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153 /* Don't use the `xsTAG;' construct in DBX output; OpenBSD systems that
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154 use DBX don't support it. */
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155 #define DBX_NO_XREFS
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156
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157
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158 /* Support of shared libraries, mostly imported from svr4.h through netbsd. */
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159 /* Two differences from svr4.h:
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160 - we use . - _func instead of a local label,
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161 - we put extra spaces in expressions such as
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162 .type _func , @function
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163 This is more readable for a human being and confuses c++filt less. */
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164
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165 /* Assembler format: output and generation of labels. */
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166
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167 /* Define the strings used for the .type and .size directives.
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168 These strings generally do not vary from one system running OpenBSD
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169 to another, but if a given system needs to use different pseudo-op
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170 names for these, they may be overridden in the arch specific file. */
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171
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172 /* OpenBSD assembler is hacked to have .type & .size support even in a.out
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173 format object files. Functions size are supported but not activated
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174 yet (look for GRACE_PERIOD_EXPIRED in gas/config/obj-aout.c).
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175 SET_ASM_OP is needed for attribute alias to work. */
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176
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177 #undef TYPE_ASM_OP
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178 #undef SIZE_ASM_OP
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179 #undef SET_ASM_OP
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180 #undef GLOBAL_ASM_OP
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181
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182 #define TYPE_ASM_OP "\t.type\t"
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183 #define SIZE_ASM_OP "\t.size\t"
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184 #define SET_ASM_OP "\t.set\t"
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185 #define GLOBAL_ASM_OP "\t.globl\t"
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186
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187 /* The following macro defines the format used to output the second
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188 operand of the .type assembler directive. */
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189 #undef TYPE_OPERAND_FMT
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190 #define TYPE_OPERAND_FMT "@%s"
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191
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192 /* Provision if extra assembler code is needed to declare a function's result
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193 (taken from svr4, not needed yet actually). */
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194 #ifndef ASM_DECLARE_RESULT
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195 #define ASM_DECLARE_RESULT(FILE, RESULT)
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196 #endif
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197
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198 /* These macros generate the special .type and .size directives which
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199 are used to set the corresponding fields of the linker symbol table
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200 entries under OpenBSD. These macros also have to output the starting
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201 labels for the relevant functions/objects. */
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202
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203 #ifndef OBSD_HAS_DECLARE_FUNCTION_NAME
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204 /* Extra assembler code needed to declare a function properly.
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205 Some assemblers may also need to also have something extra said
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206 about the function's return value. We allow for that here. */
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207 #undef ASM_DECLARE_FUNCTION_NAME
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208 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
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209 do { \
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210 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "function"); \
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211 ASM_DECLARE_RESULT (FILE, DECL_RESULT (DECL)); \
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212 ASM_OUTPUT_LABEL(FILE, NAME); \
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213 } while (0)
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214 #endif
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215
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216 #ifndef OBSD_HAS_DECLARE_FUNCTION_SIZE
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217 /* Declare the size of a function. */
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218 #undef ASM_DECLARE_FUNCTION_SIZE
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219 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
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220 do { \
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221 if (!flag_inhibit_size_directive) \
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222 ASM_OUTPUT_MEASURED_SIZE (FILE, FNAME); \
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223 } while (0)
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224 #endif
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225
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226 #ifndef OBSD_HAS_DECLARE_OBJECT
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227 /* Extra assembler code needed to declare an object properly. */
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228 #undef ASM_DECLARE_OBJECT_NAME
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229 #define ASM_DECLARE_OBJECT_NAME(FILE, NAME, DECL) \
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230 do { \
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231 HOST_WIDE_INT size; \
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232 ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \
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233 size_directive_output = 0; \
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234 if (!flag_inhibit_size_directive \
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235 && (DECL) && DECL_SIZE (DECL)) \
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236 { \
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237 size_directive_output = 1; \
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238 size = int_size_in_bytes (TREE_TYPE (DECL)); \
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239 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, NAME, size); \
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240 } \
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241 ASM_OUTPUT_LABEL (FILE, NAME); \
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242 } while (0)
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243
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244 /* Output the size directive for a decl in rest_of_decl_compilation
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245 in the case where we did not do so before the initializer.
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246 Once we find the error_mark_node, we know that the value of
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247 size_directive_output was set by ASM_DECLARE_OBJECT_NAME
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248 when it was run for the same decl. */
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249 #undef ASM_FINISH_DECLARE_OBJECT
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250 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP_LEVEL, AT_END) \
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251 do { \
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252 const char *name = XSTR (XEXP (DECL_RTL (DECL), 0), 0); \
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253 HOST_WIDE_INT size; \
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254 if (!flag_inhibit_size_directive && DECL_SIZE (DECL) \
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255 && ! AT_END && TOP_LEVEL \
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256 && DECL_INITIAL (DECL) == error_mark_node \
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257 && !size_directive_output) \
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258 { \
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259 size_directive_output = 1; \
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260 size = int_size_in_bytes (TREE_TYPE (DECL)); \
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261 ASM_OUTPUT_SIZE_DIRECTIVE (FILE, name, size); \
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262 } \
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263 } while (0)
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264 #endif
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265
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266
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267 /* Those are `generic' ways to weaken/globalize a label. We shouldn't need
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268 to override a processor specific definition. Hence, #ifndef ASM_*
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269 In case overriding turns out to be needed, one can always #undef ASM_*
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270 before including this file. */
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271
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272 /* Tell the assembler that a symbol is weak. */
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273 /* Note: netbsd arm32 assembler needs a .globl here. An override may
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274 be needed when/if we go for arm32 support. */
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275 #ifndef ASM_WEAKEN_LABEL
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276 #define ASM_WEAKEN_LABEL(FILE,NAME) \
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277 do { fputs ("\t.weak\t", FILE); assemble_name (FILE, NAME); \
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278 fputc ('\n', FILE); } while (0)
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279 #endif
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280
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281 /* Storage layout. */
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282
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283
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284 /* Otherwise, since we support weak, gthr.h erroneously tries to use
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285 #pragma weak. */
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286 #define GTHREAD_USE_WEAK 0
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287
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288 /* bug work around: we don't want to support #pragma weak, but the current
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289 code layout needs HANDLE_PRAGMA_WEAK asserted for __attribute((weak)) to
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290 work. On the other hand, we don't define HANDLE_PRAGMA_WEAK directly,
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291 as this depends on a few other details as well... */
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292 #define HANDLE_SYSV_PRAGMA 1
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293
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294 /* Stack is explicitly denied execution rights on OpenBSD platforms. */
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295 #define ENABLE_EXECUTE_STACK \
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296 extern void __enable_execute_stack (void *); \
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297 void \
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298 __enable_execute_stack (void *addr) \
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299 { \
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300 long size = getpagesize (); \
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301 long mask = ~(size-1); \
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302 char *page = (char *) (((long) addr) & mask); \
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303 char *end = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
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304 \
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305 if (mprotect (page, end - page, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) \
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306 perror ("mprotect of trampoline code"); \
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307 }
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308
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309 #include <sys/types.h>
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310 #include <sys/mman.h>
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