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111
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1 /* Darwin/powerpc host-specific hook definitions.
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2 Copyright (C) 2003-2017 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 it
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7 under the terms of the GNU General Public License as published
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8 by the Free Software Foundation; either version 3, or (at your
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9 option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 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 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "diagnostic.h"
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24 #include <sys/ucontext.h>
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25 #include "hosthooks.h"
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26 #include "hosthooks-def.h"
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27 #include "config/host-darwin.h"
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28
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29 static void segv_crash_handler (int);
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30 static void segv_handler (int, siginfo_t *, void *);
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31 static void darwin_rs6000_extra_signals (void);
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32
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33 #ifndef HAVE_DECL_SIGALTSTACK
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34 /* This doesn't have a prototype in signal.h in 10.2.x and earlier,
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35 fixed in later releases. */
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36 extern int sigaltstack(const struct sigaltstack *, struct sigaltstack *);
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37 #endif
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38
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39 /* The fields of the mcontext_t type have acquired underscores in later
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40 OS versions. */
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41 #ifdef HAS_MCONTEXT_T_UNDERSCORES
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42 #define MC_FLD(x) __ ## x
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43 #else
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44 #define MC_FLD(x) x
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45 #endif
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46
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47 #undef HOST_HOOKS_EXTRA_SIGNALS
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48 #define HOST_HOOKS_EXTRA_SIGNALS darwin_rs6000_extra_signals
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49
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50 /* On Darwin/powerpc, hitting the stack limit turns into a SIGSEGV.
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51 This code detects the difference between hitting the stack limit and
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52 a true wild pointer dereference by looking at the instruction that
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53 faulted; only a few kinds of instruction are used to access below
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54 the previous bottom of the stack. */
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55
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56 static void
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57 segv_crash_handler (int sig ATTRIBUTE_UNUSED)
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58 {
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59 internal_error ("Segmentation Fault (code)");
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60 }
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61
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62 static void
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63 segv_handler (int sig ATTRIBUTE_UNUSED,
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64 siginfo_t *sip ATTRIBUTE_UNUSED,
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65 void *scp)
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66 {
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67 ucontext_t *uc = (ucontext_t *)scp;
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68 sigset_t sigset;
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69 unsigned faulting_insn;
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70
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71 /* The fault might have happened when trying to run some instruction, in
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72 which case the next line will segfault _again_. Handle this case. */
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73 signal (SIGSEGV, segv_crash_handler);
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74 sigemptyset (&sigset);
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75 sigaddset (&sigset, SIGSEGV);
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76 sigprocmask (SIG_UNBLOCK, &sigset, NULL);
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77
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78 faulting_insn = *(unsigned *)uc->uc_mcontext->MC_FLD(ss).MC_FLD(srr0);
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79
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80 /* Note that this only has to work for GCC, so we don't have to deal
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81 with all the possible cases (GCC has no AltiVec code, for
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82 instance). It's complicated because Darwin allows stores to
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83 below the stack pointer, and the prologue code takes advantage of
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84 this. */
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85
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86 if ((faulting_insn & 0xFFFF8000) == 0x94218000 /* stwu %r1, -xxx(%r1) */
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87 || (faulting_insn & 0xFC1F03FF) == 0x7C01016E /* stwux xxx, %r1, xxx */
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88 || (faulting_insn & 0xFC1F8000) == 0x90018000 /* stw xxx, -yyy(%r1) */
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89 || (faulting_insn & 0xFC1F8000) == 0xD8018000 /* stfd xxx, -yyy(%r1) */
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90 || (faulting_insn & 0xFC1F8000) == 0xBC018000 /* stmw xxx, -yyy(%r1) */)
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91 {
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92 char *shell_name;
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93
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94 fnotice (stderr, "Out of stack space.\n");
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95 shell_name = getenv ("SHELL");
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96 if (shell_name != NULL)
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97 shell_name = strrchr (shell_name, '/');
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98 if (shell_name != NULL)
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99 {
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100 static const char * shell_commands[][2] = {
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101 { "sh", "ulimit -S -s unlimited" },
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102 { "bash", "ulimit -S -s unlimited" },
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103 { "tcsh", "limit stacksize unlimited" },
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104 { "csh", "limit stacksize unlimited" },
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105 /* zsh doesn't have "unlimited", this will work under the
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106 default configuration. */
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107 { "zsh", "limit stacksize 32m" }
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108 };
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109 size_t i;
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110
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111 for (i = 0; i < ARRAY_SIZE (shell_commands); i++)
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112 if (strcmp (shell_commands[i][0], shell_name + 1) == 0)
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113 {
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114 fnotice (stderr,
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115 "Try running '%s' in the shell to raise its limit.\n",
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116 shell_commands[i][1]);
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117 }
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118 }
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119
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120 if (global_dc->abort_on_error)
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121 fancy_abort (__FILE__, __LINE__, __FUNCTION__);
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122
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123 exit (FATAL_EXIT_CODE);
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124 }
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125
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126 fprintf (stderr, "[address=%08lx pc=%08x]\n",
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127 uc->uc_mcontext->MC_FLD(es).MC_FLD(dar),
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128 uc->uc_mcontext->MC_FLD(ss).MC_FLD(srr0));
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129 internal_error ("Segmentation Fault");
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130 exit (FATAL_EXIT_CODE);
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131 }
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132
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133 static void
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134 darwin_rs6000_extra_signals (void)
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135 {
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136 struct sigaction sact;
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137 stack_t sigstk;
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138
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139 sigstk.ss_sp = (char*)xmalloc (SIGSTKSZ);
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140 sigstk.ss_size = SIGSTKSZ;
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141 sigstk.ss_flags = 0;
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142 if (sigaltstack (&sigstk, NULL) < 0)
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143 fatal_error (input_location, "While setting up signal stack: %m");
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144
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145 sigemptyset(&sact.sa_mask);
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146 sact.sa_flags = SA_ONSTACK | SA_SIGINFO;
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147 sact.sa_sigaction = segv_handler;
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148 if (sigaction (SIGSEGV, &sact, 0) < 0)
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149 fatal_error (input_location, "While setting up signal handler: %m");
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150 }
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151
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152
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153 const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;
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