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annotate libgcc/generic-morestack-thread.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Thread library support for -fsplit-stack. */
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2 /* Copyright (C) 2009-2020 Free Software Foundation, Inc.
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3 Contributed by Ian Lance Taylor <iant@google.com>.
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4
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 the terms of the GNU General Public License as published by the Free
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 Under Section 7 of GPL version 3, you are granted additional
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 You should have received a copy of the GNU General Public License and
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 #include "tconfig.h"
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27 #include "tsystem.h"
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28 #include "coretypes.h"
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29 #include "tm.h"
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30 #include "libgcc_tm.h"
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31
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32 /* If inhibit_libc is defined, we cannot compile this file. The
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33 effect is that people will not be able to use -fsplit-stack. That
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34 is much better than failing the build particularly since people
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35 will want to define inhibit_libc while building a compiler which
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36 can build glibc. */
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37
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38 #ifndef inhibit_libc
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39
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40 #include <errno.h>
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41 #include <pthread.h>
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42
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43 #include "generic-morestack.h"
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44
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45 /* We declare the pthread functions we need as weak, so that
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46 libgcc_s.so does not need to be linked against -lpthread. */
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47
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48 extern int pthread_once (pthread_once_t *, void (*) (void))
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49 __attribute__ ((weak));
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50
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51 extern int pthread_key_create (pthread_key_t *, void (*) (void *))
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52 __attribute__ ((weak));
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53
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54 extern int pthread_setspecific (pthread_key_t, const void *)
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55 __attribute__ ((weak));
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56
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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57 /* The key for the list of stack segments to free when the thread
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58 exits. This is created by pthread_key_create. */
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59
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60 static pthread_key_t segment_list_key;
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61
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62 /* Used to only run create_key once. */
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63
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64 static pthread_once_t create_key_once = PTHREAD_ONCE_INIT;
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65
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66 /* Release all the segments for a thread. This is the destructor
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67 function used by pthread_key_create, and is called when a thread
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68 exits. */
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69
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70 static void
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71 free_segments (void* arg)
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72 {
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73 __morestack_release_segments ((struct stack_segment **) arg, 1);
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74 }
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75
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76 /* Set up the key for the list of segments. This is called via
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77 pthread_once. */
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78
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79 static void
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80 create_key (void)
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81 {
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82 int err;
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83
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84 err = pthread_key_create (&segment_list_key, free_segments);
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85 if (err != 0)
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86 {
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87 static const char msg[] = "pthread_key_create failed: errno ";
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88 __morestack_fail (msg, sizeof msg - 1, err);
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89 }
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90 }
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91
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92 /* Pass information from the pthread_create wrapper to
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93 stack_split_initialize_thread. */
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94
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95 struct pthread_create_args
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96 {
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97 void *(*start_routine) (void *);
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98 void *arg;
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99 };
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100
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101 /* Initialize a thread. This is called via pthread_create. It calls
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102 a target dependent function to set up any required stack guard. */
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103
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104 static void* stack_split_initialize_thread (void *)
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105 __attribute__ ((no_split_stack));
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106
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107 static void *
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108 stack_split_initialize_thread (void *varg)
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109 {
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110 struct pthread_create_args *args = (struct pthread_create_args *) varg;
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111 int err;
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112 void *(*start_routine) (void *);
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113 void *arg;
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114
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115 __stack_split_initialize ();
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116
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117 err = pthread_setspecific (segment_list_key, (void *) &__morestack_segments);
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118 if (err != 0)
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119 {
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120 static const char msg[] = "pthread_setspecific failed: errno ";
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121 __morestack_fail (msg, sizeof msg - 1, err);
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122 }
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123
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124 start_routine = args->start_routine;
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125 arg = args->arg;
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126 free (args);
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127 return (*start_routine) (arg);
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128 }
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129
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130 /* This function wraps calls to pthread_create to make sure that the
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131 stack guard is initialized for new threads. FIXME: This hack will
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132 not be necessary if glibc supports -fsplit-stack directly. */
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133
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134 int __wrap_pthread_create (pthread_t *, const pthread_attr_t *,
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135 void *(*start_routine) (void *), void *)
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136 __attribute__ ((visibility ("hidden")));
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137
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138 extern int __real_pthread_create (pthread_t *, const pthread_attr_t *,
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139 void *(*start_routine) (void *), void *)
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140 __attribute__ ((weak));
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141
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142 int
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143 __wrap_pthread_create (pthread_t *tid, const pthread_attr_t *attr,
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144 void *(*start_routine) (void *), void *arg)
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145 {
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146 int err;
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147 struct pthread_create_args* args;
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148
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149 err = pthread_once (&create_key_once, create_key);
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150 if (err != 0)
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151 {
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152 static const char msg[] = "pthread_once failed: errno ";
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153 __morestack_fail (msg, sizeof msg - 1, err);
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154 }
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155
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156 args = malloc (sizeof (struct pthread_create_args));
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157 if (args == NULL)
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158 return EAGAIN;
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159 args->start_routine = start_routine;
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160 args->arg = arg;
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161 return __real_pthread_create (tid, attr, stack_split_initialize_thread, args);
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162 }
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163
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164 #endif /* !defined (inhibit_libc) */