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111
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1 /* .init/.fini section handling + C++ global constructor/destructor handling.
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2 This file is based on crtstuff.c, sol2-crti.asm, sol2-crtn.asm.
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3
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145
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4 Copyright (C) 1995-2020 Free Software Foundation, Inc.
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111
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5 Contributor: Joern Rennecke <joern.rennecke@embecosm.com>
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6 on behalf of Synopsys Inc.
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7
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8 This file is part of GCC.
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9
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10 GCC is free software; you can redistribute it and/or modify
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11 it under the terms of the GNU General Public License as published by
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12 the Free Software Foundation; either version 3, or (at your option)
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13 any later version.
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14
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15 GCC is distributed in the hope that it will be useful,
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16 but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 GNU General Public License for more details.
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19
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20 Under Section 7 of GPL version 3, you are granted additional
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21 permissions described in the GCC Runtime Library Exception, version
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22 3.1, as published by the Free Software Foundation.
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23
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24 You should have received a copy of the GNU General Public License and
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25 a copy of the GCC Runtime Library Exception along with this program;
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26 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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27 <http://www.gnu.org/licenses/>. */
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28
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29 /* Declare a pointer to void function type. */
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30 typedef void (*func_ptr) (void);
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31
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32 #ifdef CRT_INIT
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33
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34 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange
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35 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
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36 __DTOR_END__ } per root executable and also one set of these symbols
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37 per shared library. So in any given whole process image, we may have
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38 multiple definitions of each of these symbols. In order to prevent
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39 these definitions from conflicting with one another, and in order to
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40 ensure that the proper lists are used for the initialization/finalization
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41 of each individual shared library (respectively), we give these symbols
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42 only internal (i.e. `static') linkage, and we also make it a point to
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43 refer to only the __CTOR_END__ symbol in crtfini.o and the __DTOR_LIST__
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44 symbol in crtinit.o, where they are defined. */
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45
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46 static func_ptr __CTOR_LIST__[1] __attribute__ ((section (".ctors")))
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47 = { (func_ptr) (-1) };
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48
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49 static func_ptr __DTOR_LIST__[1] __attribute__ ((section (".dtors")))
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50 = { (func_ptr) (-1) };
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51
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52 /* Run all the global destructors on exit from the program. */
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53
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54 /* Some systems place the number of pointers in the first word of the
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55 table. On SVR4 however, that word is -1. In all cases, the table is
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56 null-terminated. On SVR4, we start from the beginning of the list and
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57 invoke each per-compilation-unit destructor routine in order
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58 until we find that null.
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59
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60 Note that this function MUST be static. There will be one of these
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61 functions in each root executable and one in each shared library, but
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62 although they all have the same code, each one is unique in that it
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63 refers to one particular associated `__DTOR_LIST__' which belongs to the
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64 same particular root executable or shared library file. */
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65
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66 static void __do_global_dtors (void)
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67 asm ("__do_global_dtors") __attribute__ ((section (".text")));
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68
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69 static void
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70 __do_global_dtors (void)
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71 {
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72 func_ptr *p;
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73 for (p = __DTOR_LIST__ + 1; *p; p++)
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74 (*p) ();
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75 }
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76
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77 /* .init section start.
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78 This must appear at the start of the .init section. */
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79
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80 asm ("\n\
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81 .section .init\n\
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82 .global init\n\
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83 .word 0\n\
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84 init:\n\
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85 st blink,[sp,4]\n\
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86 st fp,[sp]\n\
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87 mov fp,sp\n\
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88 sub sp,sp,16\n\
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89 ");
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90
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91 /* .fini section start.
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92 This must appear at the start of the .init section. */
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93
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94 asm ("\n\
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95 .section .fini\n\
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96 .global fini\n\
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97 .word 0\n\
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98 fini:\n\
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99 st blink,[sp,4]\n\
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100 st fp,[sp]\n\
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101 mov fp,sp\n\
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102 sub sp,sp,16\n\
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103 bl.nd __do_global_dtors\n\
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104 ");
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105
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106 #endif /* CRT_INIT */
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107
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108 #ifdef CRT_FINI
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109
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110 /* Put a word containing zero at the end of each of our two lists of function
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111 addresses. Note that the words defined here go into the .ctors and .dtors
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112 sections of the crtend.o file, and since that file is always linked in
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113 last, these words naturally end up at the very ends of the two lists
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114 contained in these two sections. */
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115
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116 static func_ptr __CTOR_END__[1] __attribute__ ((section (".ctors")))
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117 = { (func_ptr) 0 };
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118
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119 static func_ptr __DTOR_END__[1] __attribute__ ((section (".dtors")))
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120 = { (func_ptr) 0 };
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121
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122 /* Run all global constructors for the program.
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123 Note that they are run in reverse order. */
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124
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125 static void __do_global_ctors (void)
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126 asm ("__do_global_ctors") __attribute__ ((section (".text")));
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127
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128 static void
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129 __do_global_ctors (void)
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130 {
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131 func_ptr *p;
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132 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
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133 (*p) ();
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134 }
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135
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136 /* .init section end.
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137 This must live at the end of the .init section. */
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138
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139 asm ("\n\
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140 .section .init\n\
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141 bl.nd __do_global_ctors\n\
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142 ld blink,[fp,4]\n\
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143 j.d blink\n\
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144 ld.a fp,[sp,16]\n\
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145 ");
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146
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147 /* .fini section end.
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148 This must live at the end of the .fini section. */
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149
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150 asm ("\n\
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151 .section .fini\n\
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152 ld blink,[fp,4]\n\
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153 j.d blink\n\
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154 ld.a fp,[sp,16]\n\
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155 ");
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156
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157 #endif /* CRT_FINI */
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