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111
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1 /* Specialized bits of code needed to support construction and
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2 destruction of file-scope objects in C++ code.
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145
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3 Copyright (C) 1991-2020 Free Software Foundation, Inc.
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111
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4 Contributed by Ron Guilmette (rfg@monkeys.com).
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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26
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27 /* This file is a bit like libgcc2.c in that it is compiled
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28 multiple times and yields multiple .o files.
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29
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30 This file is useful on target machines where the object file format
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31 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
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32 such systems, this file allows us to avoid running collect (or any
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33 other such slow and painful kludge). Additionally, if the target
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34 system supports a .init section, this file allows us to support the
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35 linking of C++ code with a non-C++ main program.
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36
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37 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
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38 this file *will* make use of the .init section. If that symbol is
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39 not defined however, then the .init section will not be used.
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40
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41 Currently, only ELF and COFF are supported. It is likely however that
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42 ROSE could also be supported, if someone was willing to do the work to
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43 make whatever (small?) adaptations are needed. (Some work may be
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44 needed on the ROSE assembler and linker also.)
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45
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46 This file must be compiled with gcc. */
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47
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48 /* Target machine header files require this define. */
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49 #define IN_LIBGCC2
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50
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51 /* FIXME: Including auto-host is incorrect, but until we have
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52 identified the set of defines that need to go into auto-target.h,
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53 this will have to do. */
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54 #include "auto-host.h"
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55 #undef caddr_t
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56 #undef pid_t
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57 #undef rlim_t
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58 #undef ssize_t
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59 #undef vfork
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60 #include "tconfig.h"
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61 #include "tsystem.h"
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62 #include "coretypes.h"
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63 #include "tm.h"
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64 #include "libgcc_tm.h"
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65 #include "unwind-dw2-fde.h"
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66
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67 #ifndef FORCE_CODE_SECTION_ALIGN
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68 # define FORCE_CODE_SECTION_ALIGN
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69 #endif
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70
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71 #ifndef CRT_CALL_STATIC_FUNCTION
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72 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
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73 static void __attribute__((__used__)) \
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74 call_ ## FUNC (void) \
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75 { \
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76 asm (SECTION_OP); \
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77 FUNC (); \
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78 FORCE_CODE_SECTION_ALIGN \
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79 asm (__LIBGCC_TEXT_SECTION_ASM_OP__); \
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80 }
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81 #endif
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82
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83 #if defined(TARGET_DL_ITERATE_PHDR) && \
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84 (defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__))
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85 #define BSD_DL_ITERATE_PHDR_AVAILABLE
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86 #endif
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87
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88 #if defined(OBJECT_FORMAT_ELF) \
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89 && !defined(OBJECT_FORMAT_FLAT) \
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90 && defined(HAVE_LD_EH_FRAME_HDR) \
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91 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
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92 && defined(BSD_DL_ITERATE_PHDR_AVAILABLE)
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93 #include <link.h>
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94 # define USE_PT_GNU_EH_FRAME
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95 #endif
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96
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97 #if defined(OBJECT_FORMAT_ELF) \
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98 && !defined(OBJECT_FORMAT_FLAT) \
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99 && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \
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100 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
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101 && defined(__sun__) && defined(__svr4__)
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102 #include <link.h>
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103 # define USE_PT_GNU_EH_FRAME
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104 #endif
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105
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106 #if defined(OBJECT_FORMAT_ELF) \
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107 && !defined(OBJECT_FORMAT_FLAT) \
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108 && defined(HAVE_LD_EH_FRAME_HDR) \
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109 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
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110 && defined(__GLIBC__) && __GLIBC__ >= 2
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111 #include <link.h>
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112 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h.
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113 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */
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114 # if !defined(__UCLIBC__) \
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115 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
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116 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
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117 # define USE_PT_GNU_EH_FRAME
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118 # endif
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119 #endif
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120
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121 #if defined(OBJECT_FORMAT_ELF) \
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122 && !defined(OBJECT_FORMAT_FLAT) \
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123 && defined(HAVE_LD_EH_FRAME_HDR) \
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124 && !defined(CRTSTUFFT_O) \
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125 && defined(inhibit_libc) \
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126 && (defined(__GLIBC__) || defined(__gnu_linux__) || defined(__GNU__))
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127 /* On systems using glibc, an inhibit_libc build of libgcc is only
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128 part of a bootstrap process. Build the same crt*.o as would be
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129 built with headers present, so that it is not necessary to build
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130 glibc more than once for the bootstrap to converge. */
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131 # define USE_PT_GNU_EH_FRAME
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132 #endif
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133
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134 #ifdef USE_EH_FRAME_REGISTRY_ALWAYS
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135 # ifndef __LIBGCC_EH_FRAME_SECTION_NAME__
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136 # error "Can't use explicit exception-frame-registration without __LIBGCC_EH_FRAME_SECTION_NAME__"
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137 # endif
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138 #endif
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139 #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) && (!defined(USE_PT_GNU_EH_FRAME) || defined(USE_EH_FRAME_REGISTRY_ALWAYS))
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140 # define USE_EH_FRAME_REGISTRY
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141 #endif
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142 #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) \
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143 && __LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__
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144 # define EH_FRAME_SECTION_CONST const
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145 #else
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146 # define EH_FRAME_SECTION_CONST
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|
|
147 #endif
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148
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|
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149 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \
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150 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP)
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151 # define HIDDEN_DTOR_LIST_END
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152 #endif
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153
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154 #if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF)
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155 # define USE_TM_CLONE_REGISTRY 1
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145
|
156 #elif !defined(USE_TM_CLONE_REGISTRY)
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|
157 # define USE_TM_CLONE_REGISTRY 0
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111
|
158 #endif
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159
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160 /* We do not want to add the weak attribute to the declarations of these
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161 routines in unwind-dw2-fde.h because that will cause the definition of
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162 these symbols to be weak as well.
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163
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164 This exposes a core issue, how to handle creating weak references vs
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165 how to create weak definitions. Either we have to have the definition
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166 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
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167 have a second declaration if we want a function's references to be weak,
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168 but not its definition.
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169
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170 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
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171 one thinks about scaling to larger problems -- i.e., the condition under
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172 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
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173 complicated.
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174
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175 So, we take an approach similar to #pragma weak -- we have a second
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176 declaration for functions that we want to have weak references.
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177
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178 Neither way is particularly good. */
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179
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180 /* References to __register_frame_info and __deregister_frame_info should
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181 be weak in this file if at all possible. */
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182 extern void __register_frame_info (const void *, struct object *)
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183 TARGET_ATTRIBUTE_WEAK;
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184 extern void __register_frame_info_bases (const void *, struct object *,
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185 void *, void *)
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186 TARGET_ATTRIBUTE_WEAK;
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187 extern void *__deregister_frame_info (const void *)
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188 TARGET_ATTRIBUTE_WEAK;
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189 extern void *__deregister_frame_info_bases (const void *)
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|
190 TARGET_ATTRIBUTE_WEAK;
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191 extern void __do_global_ctors_1 (void);
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192
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|
193 /* Likewise for transactional memory clone tables. */
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|
194 extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK;
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195 extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK;
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|
196
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|
197 #ifdef OBJECT_FORMAT_ELF
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198
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|
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199 /* Declare a pointer to void function type. */
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|
200 typedef void (*func_ptr) (void);
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201 #define STATIC static
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202
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|
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203 #else /* OBJECT_FORMAT_ELF */
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204
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205 #include "gbl-ctors.h"
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206
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|
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207 #define STATIC
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208
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|
|
209 #endif /* OBJECT_FORMAT_ELF */
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210
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|
|
211 #ifdef CRT_BEGIN
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212
|
|
|
213 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange
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214 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
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|
215 __DTOR_END__ } per root executable and also one set of these symbols
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|
216 per shared library. So in any given whole process image, we may have
|
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|
217 multiple definitions of each of these symbols. In order to prevent
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218 these definitions from conflicting with one another, and in order to
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219 ensure that the proper lists are used for the initialization/finalization
|
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220 of each individual shared library (respectively), we give these symbols
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221 only internal (i.e. `static') linkage, and we also make it a point to
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222 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
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|
223 symbol in crtbegin.o, where they are defined. */
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224
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|
|
225 /* No need for .ctors/.dtors section if linker can place them in
|
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|
226 .init_array/.fini_array section. */
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|
|
227 #ifndef USE_INITFINI_ARRAY
|
|
|
228 /* The -1 is a flag to __do_global_[cd]tors indicating that this table
|
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|
229 does not start with a count of elements. */
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|
230 #ifdef CTOR_LIST_BEGIN
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231 CTOR_LIST_BEGIN;
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|
232 #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__)
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233 /* Hack: force cc1 to switch to .data section early, so that assembling
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234 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
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|
235 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
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|
|
236 asm (__LIBGCC_CTORS_SECTION_ASM_OP__);
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|
237 STATIC func_ptr __CTOR_LIST__[1]
|
|
145
|
238 __attribute__ ((__used__, aligned(__alignof__(func_ptr))))
|
|
111
|
239 = { (func_ptr) (-1) };
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|
|
240 #else
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|
|
241 STATIC func_ptr __CTOR_LIST__[1]
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|
145
|
242 __attribute__ ((__used__, section(".ctors"), aligned(__alignof__(func_ptr))))
|
|
111
|
243 = { (func_ptr) (-1) };
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|
|
244 #endif /* __CTOR_LIST__ alternatives */
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245
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|
|
246 #ifdef DTOR_LIST_BEGIN
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|
247 DTOR_LIST_BEGIN;
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|
|
248 #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__)
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|
249 asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
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|
250 STATIC func_ptr __DTOR_LIST__[1]
|
|
145
|
251 __attribute__ ((aligned(__alignof__(func_ptr))))
|
|
111
|
252 = { (func_ptr) (-1) };
|
|
|
253 #else
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|
|
254 STATIC func_ptr __DTOR_LIST__[1]
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|
145
|
255 __attribute__((section(".dtors"), aligned(__alignof__(func_ptr))))
|
|
111
|
256 = { (func_ptr) (-1) };
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|
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257 #endif /* __DTOR_LIST__ alternatives */
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|
|
258 #endif /* USE_INITFINI_ARRAY */
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259
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|
|
260 #ifdef USE_EH_FRAME_REGISTRY
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|
261 /* Stick a label at the beginning of the frame unwind info so we can register
|
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|
262 and deregister it with the exception handling library code. */
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|
263 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
|
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|
264 __attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4)))
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265 = { };
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|
266 #endif /* USE_EH_FRAME_REGISTRY */
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267
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|
|
268 #if USE_TM_CLONE_REGISTRY
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269 STATIC func_ptr __TMC_LIST__[]
|
|
145
|
270 __attribute__((used, section(".tm_clone_table"), aligned(__alignof__(void*))))
|
|
111
|
271 = { };
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|
272 # ifdef HAVE_GAS_HIDDEN
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273 extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden")));
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274 # endif
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275
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276 static inline void
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|
277 deregister_tm_clones (void)
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|
|
278 {
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|
279 void (*fn) (void *);
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280
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|
|
281 #ifdef HAVE_GAS_HIDDEN
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|
282 func_ptr *end = __TMC_END__;
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|
283 // Do not optimize the comparison to false.
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|
284 __asm ("" : "+g" (end));
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|
285 if (__TMC_LIST__ == end)
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|
286 return;
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|
|
287 #else
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|
|
288 if (__TMC_LIST__[0] == NULL)
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|
289 return;
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|
|
290 #endif
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|
291
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|
292 fn = _ITM_deregisterTMCloneTable;
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|
293 __asm ("" : "+r" (fn));
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|
294 if (fn)
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|
|
295 fn (__TMC_LIST__);
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|
|
296 }
|
|
|
297
|
|
|
298 static inline void
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|
|
299 register_tm_clones (void)
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|
|
300 {
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|
|
301 void (*fn) (void *, size_t);
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|
|
302 size_t size;
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|
303
|
|
|
304 #ifdef HAVE_GAS_HIDDEN
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|
305 func_ptr *end = __TMC_END__;
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|
306 // Do not optimize the comparison to false.
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|
307 __asm ("" : "+g" (end));
|
|
|
308 size = (end - __TMC_LIST__) / 2;
|
|
|
309 #else
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|
310 for (size = 0; __TMC_LIST__[size * 2] != NULL; size++)
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|
|
311 continue;
|
|
|
312 #endif
|
|
|
313 if (size == 0)
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|
|
314 return;
|
|
|
315
|
|
|
316 fn = _ITM_registerTMCloneTable;
|
|
|
317 __asm ("" : "+r" (fn));
|
|
|
318 if (fn)
|
|
|
319 fn (__TMC_LIST__, size);
|
|
|
320 }
|
|
|
321 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
322
|
|
|
323 #if defined(__LIBGCC_INIT_SECTION_ASM_OP__) \
|
|
|
324 || defined(__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__)
|
|
|
325
|
|
|
326 #ifdef OBJECT_FORMAT_ELF
|
|
|
327
|
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145
|
328 #if DEFAULT_USE_CXA_ATEXIT
|
|
111
|
329 /* Declare the __dso_handle variable. It should have a unique value
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|
|
330 in every shared-object; in a main program its value is zero. The
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|
|
331 object should in any case be protected. This means the instance
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|
332 in one DSO or the main program is not used in another object. The
|
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145
|
333 dynamic linker takes care of this.
|
|
|
334 If __cxa_atexit is not being used, __dso_handle will not be used and
|
|
|
335 doesn't need to be defined. */
|
|
111
|
336
|
|
|
337 #ifdef TARGET_LIBGCC_SDATA_SECTION
|
|
|
338 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION)));
|
|
|
339 #endif
|
|
|
340 #ifdef HAVE_GAS_HIDDEN
|
|
|
341 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
|
|
|
342 #endif
|
|
|
343 #ifdef CRTSTUFFS_O
|
|
|
344 void *__dso_handle = &__dso_handle;
|
|
|
345 #else
|
|
|
346 void *__dso_handle = 0;
|
|
|
347 #endif
|
|
145
|
348 #endif /* DEFAULT_USE_CXA_ATEXIT */
|
|
111
|
349
|
|
|
350 /* The __cxa_finalize function may not be available so we use only a
|
|
|
351 weak declaration. */
|
|
|
352 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
|
|
|
353
|
|
|
354 /* Run all the global destructors on exit from the program. */
|
|
|
355
|
|
|
356 /* Some systems place the number of pointers in the first word of the
|
|
|
357 table. On SVR4 however, that word is -1. In all cases, the table is
|
|
|
358 null-terminated. On SVR4, we start from the beginning of the list and
|
|
|
359 invoke each per-compilation-unit destructor routine in order
|
|
|
360 until we find that null.
|
|
|
361
|
|
|
362 Note that this function MUST be static. There will be one of these
|
|
|
363 functions in each root executable and one in each shared library, but
|
|
|
364 although they all have the same code, each one is unique in that it
|
|
|
365 refers to one particular associated `__DTOR_LIST__' which belongs to the
|
|
|
366 same particular root executable or shared library file.
|
|
|
367
|
|
|
368 On some systems, this routine is run more than once from the .fini,
|
|
|
369 when exit is called recursively, so we arrange to remember where in
|
|
|
370 the list we left off processing, and we resume at that point,
|
|
145
|
371 should we be re-invoked.
|
|
111
|
372
|
|
145
|
373 This routine does not need to be run if none of the following clauses are
|
|
|
374 true, as it will not do anything, so can be removed. */
|
|
|
375 #if defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP) \
|
|
|
376 || USE_TM_CLONE_REGISTRY || defined(USE_EH_FRAME_REGISTRY)
|
|
111
|
377 static void __attribute__((used))
|
|
|
378 __do_global_dtors_aux (void)
|
|
|
379 {
|
|
|
380 static _Bool completed;
|
|
|
381
|
|
|
382 if (__builtin_expect (completed, 0))
|
|
|
383 return;
|
|
|
384
|
|
145
|
385 #if DEFAULT_USE_CXA_ATEXIT
|
|
111
|
386 #ifdef CRTSTUFFS_O
|
|
|
387 if (__cxa_finalize)
|
|
|
388 __cxa_finalize (__dso_handle);
|
|
|
389 #endif
|
|
145
|
390 #endif
|
|
111
|
391
|
|
|
392 #ifdef FINI_ARRAY_SECTION_ASM_OP
|
|
|
393 /* If we are using .fini_array then destructors will be run via that
|
|
|
394 mechanism. */
|
|
|
395 #elif defined(HIDDEN_DTOR_LIST_END)
|
|
|
396 {
|
|
|
397 /* Safer version that makes sure only .dtors function pointers are
|
|
|
398 called even if the static variable is maliciously changed. */
|
|
|
399 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
|
|
|
400 static size_t dtor_idx;
|
|
|
401 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
|
|
|
402 func_ptr *dtor_list;
|
|
|
403
|
|
|
404 __asm ("" : "=g" (dtor_list) : "0" (__DTOR_LIST__));
|
|
|
405 while (dtor_idx < max_idx)
|
|
|
406 dtor_list[++dtor_idx] ();
|
|
|
407 }
|
|
|
408 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
|
|
|
409 {
|
|
|
410 static func_ptr *p = __DTOR_LIST__ + 1;
|
|
|
411 func_ptr f;
|
|
|
412
|
|
|
413 while ((f = *p))
|
|
|
414 {
|
|
|
415 p++;
|
|
|
416 f ();
|
|
|
417 }
|
|
|
418 }
|
|
|
419 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
|
|
|
420
|
|
|
421 #if USE_TM_CLONE_REGISTRY
|
|
|
422 deregister_tm_clones ();
|
|
|
423 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
424
|
|
|
425 #ifdef USE_EH_FRAME_REGISTRY
|
|
|
426 #ifdef CRT_GET_RFIB_DATA
|
|
|
427 /* If we used the new __register_frame_info_bases interface,
|
|
|
428 make sure that we deregister from the same place. */
|
|
|
429 if (__deregister_frame_info_bases)
|
|
|
430 __deregister_frame_info_bases (__EH_FRAME_BEGIN__);
|
|
|
431 #else
|
|
|
432 if (__deregister_frame_info)
|
|
|
433 __deregister_frame_info (__EH_FRAME_BEGIN__);
|
|
|
434 #endif
|
|
|
435 #endif
|
|
|
436
|
|
|
437 completed = 1;
|
|
|
438 }
|
|
|
439
|
|
|
440 /* Stick a call to __do_global_dtors_aux into the .fini section. */
|
|
|
441 #ifdef FINI_SECTION_ASM_OP
|
|
|
442 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
|
|
|
443 #elif defined (FINI_ARRAY_SECTION_ASM_OP)
|
|
145
|
444 #if defined(__FDPIC__)
|
|
|
445 __asm__("\t.equ\t__do_global_dtors_aux_alias, __do_global_dtors_aux\n");
|
|
|
446 extern char __do_global_dtors_aux_alias;
|
|
|
447 static void *__do_global_dtors_aux_fini_array_entry[]
|
|
|
448 __attribute__ ((__used__, section(".fini_array"), aligned(sizeof(void *))))
|
|
|
449 = { &__do_global_dtors_aux_alias };
|
|
|
450 #else /* defined(__FDPIC__) */
|
|
111
|
451 static func_ptr __do_global_dtors_aux_fini_array_entry[]
|
|
145
|
452 __attribute__ ((__used__, section(".fini_array"),
|
|
|
453 aligned(__alignof__(func_ptr)))) = { __do_global_dtors_aux };
|
|
|
454 #endif /* defined(__FDPIC__) */
|
|
111
|
455 #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */
|
|
|
456 static void __attribute__((used))
|
|
|
457 __do_global_dtors_aux_1 (void)
|
|
|
458 {
|
|
|
459 atexit (__do_global_dtors_aux);
|
|
|
460 }
|
|
|
461 CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__,
|
|
|
462 __do_global_dtors_aux_1)
|
|
|
463 #endif
|
|
145
|
464 #endif /* defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP)
|
|
|
465 || USE_TM_CLONE_REGISTRY || defined(USE_EH_FRAME_REGISTRY) */
|
|
111
|
466
|
|
145
|
467 #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY
|
|
111
|
468 /* Stick a call to __register_frame_info into the .init section. For some
|
|
|
469 reason calls with no arguments work more reliably in .init, so stick the
|
|
|
470 call in another function. */
|
|
|
471
|
|
|
472 static void __attribute__((used))
|
|
|
473 frame_dummy (void)
|
|
|
474 {
|
|
|
475 #ifdef USE_EH_FRAME_REGISTRY
|
|
|
476 static struct object object;
|
|
|
477 #ifdef CRT_GET_RFIB_DATA
|
|
|
478 void *tbase, *dbase;
|
|
|
479 tbase = 0;
|
|
|
480 CRT_GET_RFIB_DATA (dbase);
|
|
|
481 if (__register_frame_info_bases)
|
|
|
482 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
|
|
|
483 #else
|
|
|
484 if (__register_frame_info)
|
|
|
485 __register_frame_info (__EH_FRAME_BEGIN__, &object);
|
|
|
486 #endif /* CRT_GET_RFIB_DATA */
|
|
|
487 #endif /* USE_EH_FRAME_REGISTRY */
|
|
|
488
|
|
|
489 #if USE_TM_CLONE_REGISTRY
|
|
|
490 register_tm_clones ();
|
|
|
491 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
492 }
|
|
|
493
|
|
|
494 #ifdef __LIBGCC_INIT_SECTION_ASM_OP__
|
|
|
495 CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, frame_dummy)
|
|
|
496 #else /* defined(__LIBGCC_INIT_SECTION_ASM_OP__) */
|
|
145
|
497 #if defined(__FDPIC__)
|
|
|
498 __asm__("\t.equ\t__frame_dummy_alias, frame_dummy\n");
|
|
|
499 extern char __frame_dummy_alias;
|
|
|
500 static void *__frame_dummy_init_array_entry[]
|
|
|
501 __attribute__ ((__used__, section(".init_array"), aligned(sizeof(void *))))
|
|
|
502 = { &__frame_dummy_alias };
|
|
|
503 #else /* defined(__FDPIC__) */
|
|
111
|
504 static func_ptr __frame_dummy_init_array_entry[]
|
|
145
|
505 __attribute__ ((__used__, section(".init_array"),
|
|
|
506 aligned(__alignof__(func_ptr)))) = { frame_dummy };
|
|
|
507 #endif /* defined(__FDPIC__) */
|
|
111
|
508 #endif /* !defined(__LIBGCC_INIT_SECTION_ASM_OP__) */
|
|
|
509 #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */
|
|
|
510
|
|
|
511 #else /* OBJECT_FORMAT_ELF */
|
|
|
512
|
|
|
513 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
|
|
|
514 and once in crtend.o). It must be declared static to avoid a link
|
|
|
515 error. Here, we define __do_global_ctors as an externally callable
|
|
|
516 function. It is externally callable so that __main can invoke it when
|
|
|
517 INVOKE__main is defined. This has the additional effect of forcing cc1
|
|
|
518 to switch to the .text section. */
|
|
|
519
|
|
|
520 static void __do_global_ctors_aux (void);
|
|
|
521 void
|
|
|
522 __do_global_ctors (void)
|
|
|
523 {
|
|
|
524 #ifdef INVOKE__main
|
|
|
525 /* If __main won't actually call __do_global_ctors then it doesn't matter
|
|
|
526 what's inside the function. The inside of __do_global_ctors_aux is
|
|
|
527 called automatically in that case. And the Alliant fx2800 linker
|
|
|
528 crashes on this reference. So prevent the crash. */
|
|
|
529 __do_global_ctors_aux ();
|
|
|
530 #endif
|
|
|
531 }
|
|
|
532
|
|
|
533 asm (__LIBGCC_INIT_SECTION_ASM_OP__); /* cc1 doesn't know that we are switching! */
|
|
|
534
|
|
|
535 /* A routine to invoke all of the global constructors upon entry to the
|
|
|
536 program. We put this into the .init section (for systems that have
|
|
|
537 such a thing) so that we can properly perform the construction of
|
|
|
538 file-scope static-storage C++ objects within shared libraries. */
|
|
|
539
|
|
|
540 static void __attribute__((used))
|
|
|
541 __do_global_ctors_aux (void) /* prologue goes in .init section */
|
|
|
542 {
|
|
|
543 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
|
|
|
544 asm (__LIBGCC_TEXT_SECTION_ASM_OP__); /* don't put epilogue and body in .init */
|
|
|
545 DO_GLOBAL_CTORS_BODY;
|
|
|
546 atexit (__do_global_dtors);
|
|
|
547 }
|
|
|
548
|
|
|
549 #endif /* OBJECT_FORMAT_ELF */
|
|
|
550
|
|
|
551 #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */
|
|
|
552
|
|
|
553 extern void __do_global_dtors (void);
|
|
|
554
|
|
|
555 /* This case is used by the Irix 6 port, which supports named sections but
|
|
|
556 not an SVR4-style .fini section. __do_global_dtors can be non-static
|
|
|
557 in this case because we protect it with -hidden_symbol. */
|
|
|
558
|
|
|
559 void
|
|
|
560 __do_global_dtors (void)
|
|
|
561 {
|
|
|
562 func_ptr *p, f;
|
|
|
563 for (p = __DTOR_LIST__ + 1; (f = *p); p++)
|
|
|
564 f ();
|
|
|
565
|
|
|
566 #if USE_TM_CLONE_REGISTRY
|
|
|
567 deregister_tm_clones ();
|
|
|
568 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
569
|
|
|
570 #ifdef USE_EH_FRAME_REGISTRY
|
|
|
571 if (__deregister_frame_info)
|
|
|
572 __deregister_frame_info (__EH_FRAME_BEGIN__);
|
|
|
573 #endif
|
|
|
574 }
|
|
|
575
|
|
145
|
576 #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY
|
|
111
|
577 /* A helper function for __do_global_ctors, which is in crtend.o. Here
|
|
|
578 in crtbegin.o, we can reference a couple of symbols not visible there.
|
|
|
579 Plus, since we're before libgcc.a, we have no problems referencing
|
|
|
580 functions from there. */
|
|
|
581 void
|
|
|
582 __do_global_ctors_1(void)
|
|
|
583 {
|
|
|
584 #ifdef USE_EH_FRAME_REGISTRY
|
|
|
585 static struct object object;
|
|
|
586 if (__register_frame_info)
|
|
|
587 __register_frame_info (__EH_FRAME_BEGIN__, &object);
|
|
|
588 #endif
|
|
|
589
|
|
|
590 #if USE_TM_CLONE_REGISTRY
|
|
|
591 register_tm_clones ();
|
|
|
592 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
593 }
|
|
|
594 #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */
|
|
|
595
|
|
|
596 #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */
|
|
|
597 #error "What are you doing with crtstuff.c, then?"
|
|
|
598 #endif
|
|
|
599
|
|
|
600 #elif defined(CRT_END) /* ! CRT_BEGIN */
|
|
|
601
|
|
|
602 /* No need for .ctors/.dtors section if linker can place them in
|
|
|
603 .init_array/.fini_array section. */
|
|
|
604 #ifndef USE_INITFINI_ARRAY
|
|
|
605 /* Put a word containing zero at the end of each of our two lists of function
|
|
|
606 addresses. Note that the words defined here go into the .ctors and .dtors
|
|
|
607 sections of the crtend.o file, and since that file is always linked in
|
|
|
608 last, these words naturally end up at the very ends of the two lists
|
|
|
609 contained in these two sections. */
|
|
|
610
|
|
|
611 #ifdef CTOR_LIST_END
|
|
|
612 CTOR_LIST_END;
|
|
|
613 #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__)
|
|
|
614 /* Hack: force cc1 to switch to .data section early, so that assembling
|
|
|
615 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
|
|
|
616 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
|
|
|
617 asm (__LIBGCC_CTORS_SECTION_ASM_OP__);
|
|
|
618 STATIC func_ptr __CTOR_END__[1]
|
|
145
|
619 __attribute__((aligned(__alignof__(func_ptr))))
|
|
111
|
620 = { (func_ptr) 0 };
|
|
|
621 #else
|
|
|
622 STATIC func_ptr __CTOR_END__[1]
|
|
145
|
623 __attribute__((section(".ctors"), aligned(__alignof__(func_ptr))))
|
|
111
|
624 = { (func_ptr) 0 };
|
|
|
625 #endif
|
|
|
626
|
|
|
627 #ifdef DTOR_LIST_END
|
|
|
628 DTOR_LIST_END;
|
|
|
629 #elif defined(HIDDEN_DTOR_LIST_END)
|
|
|
630 #ifdef __LIBGCC_DTORS_SECTION_ASM_OP__
|
|
|
631 asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
|
|
|
632 #endif
|
|
|
633 func_ptr __DTOR_END__[1]
|
|
|
634 __attribute__ ((used,
|
|
|
635 #ifndef __LIBGCC_DTORS_SECTION_ASM_OP__
|
|
|
636 section(".dtors"),
|
|
|
637 #endif
|
|
145
|
638 aligned(__alignof__(func_ptr)), visibility ("hidden")))
|
|
111
|
639 = { (func_ptr) 0 };
|
|
|
640 #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__)
|
|
|
641 asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
|
|
|
642 STATIC func_ptr __DTOR_END__[1]
|
|
145
|
643 __attribute__ ((used, aligned(__alignof__(func_ptr))))
|
|
111
|
644 = { (func_ptr) 0 };
|
|
|
645 #else
|
|
|
646 STATIC func_ptr __DTOR_END__[1]
|
|
145
|
647 __attribute__((used, section(".dtors"), aligned(__alignof__(func_ptr))))
|
|
111
|
648 = { (func_ptr) 0 };
|
|
|
649 #endif
|
|
|
650 #endif /* USE_INITFINI_ARRAY */
|
|
|
651
|
|
|
652 #ifdef __LIBGCC_EH_FRAME_SECTION_NAME__
|
|
|
653 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
|
|
|
654 this would be the 'length' field in a real FDE. */
|
|
|
655 # if __INT_MAX__ == 2147483647
|
|
|
656 typedef int int32;
|
|
|
657 # elif __LONG_MAX__ == 2147483647
|
|
|
658 typedef long int32;
|
|
|
659 # elif __SHRT_MAX__ == 2147483647
|
|
|
660 typedef short int32;
|
|
|
661 # else
|
|
|
662 # error "Missing a 4 byte integer"
|
|
|
663 # endif
|
|
|
664 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
|
|
|
665 __attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__),
|
|
145
|
666 aligned(__alignof__(int32))))
|
|
111
|
667 = { 0 };
|
|
|
668 #endif /* __LIBGCC_EH_FRAME_SECTION_NAME__ */
|
|
|
669
|
|
|
670 #if USE_TM_CLONE_REGISTRY
|
|
|
671 # ifndef HAVE_GAS_HIDDEN
|
|
|
672 static
|
|
|
673 # endif
|
|
|
674 func_ptr __TMC_END__[]
|
|
145
|
675 __attribute__((used, section(".tm_clone_table"),
|
|
|
676 aligned(__alignof__(void *))))
|
|
111
|
677 # ifdef HAVE_GAS_HIDDEN
|
|
|
678 __attribute__((__visibility__ ("hidden"))) = { };
|
|
|
679 # else
|
|
|
680 = { 0, 0 };
|
|
|
681 # endif
|
|
|
682 #endif /* USE_TM_CLONE_REGISTRY */
|
|
|
683
|
|
|
684 #ifdef __LIBGCC_INIT_ARRAY_SECTION_ASM_OP__
|
|
|
685
|
|
|
686 /* If we are using .init_array, there is nothing to do. */
|
|
|
687
|
|
|
688 #elif defined(__LIBGCC_INIT_SECTION_ASM_OP__)
|
|
|
689
|
|
|
690 #ifdef OBJECT_FORMAT_ELF
|
|
|
691 static void __attribute__((used))
|
|
|
692 __do_global_ctors_aux (void)
|
|
|
693 {
|
|
|
694 func_ptr *p;
|
|
|
695 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
|
|
|
696 (*p) ();
|
|
|
697 }
|
|
|
698
|
|
|
699 /* Stick a call to __do_global_ctors_aux into the .init section. */
|
|
|
700 CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, __do_global_ctors_aux)
|
|
|
701 #else /* OBJECT_FORMAT_ELF */
|
|
|
702
|
|
|
703 /* Stick the real initialization code, followed by a normal sort of
|
|
|
704 function epilogue at the very end of the .init section for this
|
|
|
705 entire root executable file or for this entire shared library file.
|
|
|
706
|
|
|
707 Note that we use some tricks here to get *just* the body and just
|
|
|
708 a function epilogue (but no function prologue) into the .init
|
|
|
709 section of the crtend.o file. Specifically, we switch to the .text
|
|
|
710 section, start to define a function, and then we switch to the .init
|
|
|
711 section just before the body code.
|
|
|
712
|
|
|
713 Earlier on, we put the corresponding function prologue into the .init
|
|
|
714 section of the crtbegin.o file (which will be linked in first).
|
|
|
715
|
|
|
716 Note that we want to invoke all constructors for C++ file-scope static-
|
|
|
717 storage objects AFTER any other possible initialization actions which
|
|
|
718 may be performed by the code in the .init section contributions made by
|
|
|
719 other libraries, etc. That's because those other initializations may
|
|
|
720 include setup operations for very primitive things (e.g. initializing
|
|
|
721 the state of the floating-point coprocessor, etc.) which should be done
|
|
|
722 before we start to execute any of the user's code. */
|
|
|
723
|
|
|
724 static void
|
|
|
725 __do_global_ctors_aux (void) /* prologue goes in .text section */
|
|
|
726 {
|
|
|
727 asm (__LIBGCC_INIT_SECTION_ASM_OP__);
|
|
|
728 DO_GLOBAL_CTORS_BODY;
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|
|
729 atexit (__do_global_dtors);
|
|
|
730 } /* epilogue and body go in .init section */
|
|
|
731
|
|
|
732 FORCE_CODE_SECTION_ALIGN
|
|
|
733 asm (__LIBGCC_TEXT_SECTION_ASM_OP__);
|
|
|
734
|
|
|
735 #endif /* OBJECT_FORMAT_ELF */
|
|
|
736
|
|
|
737 #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */
|
|
|
738
|
|
|
739 extern void __do_global_ctors (void);
|
|
|
740
|
|
|
741 /* This case is used by the Irix 6 port, which supports named sections but
|
|
|
742 not an SVR4-style .init section. __do_global_ctors can be non-static
|
|
|
743 in this case because we protect it with -hidden_symbol. */
|
|
|
744 void
|
|
|
745 __do_global_ctors (void)
|
|
|
746 {
|
|
|
747 func_ptr *p;
|
|
145
|
748 #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY
|
|
111
|
749 __do_global_ctors_1();
|
|
|
750 #endif
|
|
|
751 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
|
|
|
752 (*p) ();
|
|
|
753 }
|
|
|
754
|
|
|
755 #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */
|
|
|
756 #error "What are you doing with crtstuff.c, then?"
|
|
|
757 #endif
|
|
|
758
|
|
|
759 #else /* ! CRT_BEGIN && ! CRT_END */
|
|
|
760 #error "One of CRT_BEGIN or CRT_END must be defined."
|
|
|
761 #endif
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