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1 // -*- C++ -*- ARM specific Exception handling support routines.
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145
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2 // Copyright (C) 2004-2020 Free Software Foundation, Inc.
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111
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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 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19 //
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 #include <cxxabi.h>
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26 #include "unwind-cxx.h"
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27
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28 #ifdef __ARM_EABI_UNWINDER__
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29
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30 using namespace __cxxabiv1;
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31
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32
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33 // Given the thrown type THROW_TYPE, exception object UE_HEADER and a
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34 // type CATCH_TYPE to compare against, return whether or not there is
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35 // a match and if so, update *THROWN_PTR_P to point to either the
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36 // type-matched object, or in the case of a pointer type, the object
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37 // pointed to by the pointer.
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38
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39 extern "C" __cxa_type_match_result
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40 __cxa_type_match(_Unwind_Exception* ue_header,
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41 const std::type_info* catch_type,
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42 bool is_reference __attribute__((__unused__)),
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43 void** thrown_ptr_p)
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44 {
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45 bool forced_unwind
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46 = __is_gxx_forced_unwind_class(ue_header->exception_class);
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47 bool foreign_exception
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48 = !forced_unwind && !__is_gxx_exception_class(ue_header->exception_class);
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49 bool dependent_exception
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50 = __is_dependent_exception(ue_header->exception_class);
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51 __cxa_exception* xh = __get_exception_header_from_ue(ue_header);
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52 __cxa_dependent_exception *dx = __get_dependent_exception_from_ue(ue_header);
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53 const std::type_info* throw_type;
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54 void *thrown_ptr = 0;
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55
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56 if (forced_unwind)
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57 throw_type = &typeid(abi::__forced_unwind);
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58 else if (foreign_exception)
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59 throw_type = &typeid(abi::__foreign_exception);
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60 else
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61 {
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62 if (dependent_exception)
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63 xh = __get_exception_header_from_obj (dx->primaryException);
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64 throw_type = xh->exceptionType;
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65 // We used to require the caller set the target of thrown_ptr_p,
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66 // but that's incorrect -- the EHABI makes no such requirement
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67 // -- and not all callers will set it. Fortunately callers that
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68 // do initialize will always pass us the value we calculate
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69 // here, so there's no backwards compatibility problem.
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70 thrown_ptr = __get_object_from_ue (ue_header);
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71 }
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72
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73 __cxa_type_match_result result = ctm_succeeded;
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74
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75 // Pointer types need to adjust the actual pointer, not
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76 // the pointer to pointer that is the exception object.
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77 // This also has the effect of passing pointer types
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78 // "by value" through the __cxa_begin_catch return value.
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79 if (throw_type->__is_pointer_p())
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80 {
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81 thrown_ptr = *(void**) thrown_ptr;
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82 // We need to indicate the indirection to our caller.
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83 result = ctm_succeeded_with_ptr_to_base;
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84 }
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85
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86 if (catch_type->__do_catch(throw_type, &thrown_ptr, 1))
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87 {
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88 *thrown_ptr_p = thrown_ptr;
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89 return result;
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90 }
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91
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92 return ctm_failed;
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93 }
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94
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95 // ABI defined routine called at the start of a cleanup handler.
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96 extern "C" bool
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97 __cxa_begin_cleanup(_Unwind_Exception* ue_header)
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98 {
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99 __cxa_eh_globals *globals = __cxa_get_globals();
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100 __cxa_exception *header = __get_exception_header_from_ue(ue_header);
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101 bool native = __is_gxx_exception_class(header->unwindHeader.exception_class);
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102
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103
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104 if (native)
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105 {
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106 header->propagationCount++;
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107 // Add it to the chain if this is the first time we've seen this
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108 // exception.
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109 if (header->propagationCount == 1)
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110 {
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111 header->nextPropagatingException = globals->propagatingExceptions;
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112 globals->propagatingExceptions = header;
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113 }
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114 }
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115 else
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116 {
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117 // Remember the exception object, so end_cleanup can return it.
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118 // These cannot be stacked, so we must abort if we already have
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119 // a propagating exception.
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120 if (globals->propagatingExceptions)
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121 std::terminate ();
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122 globals->propagatingExceptions = header;
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123 }
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124
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125 return true;
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126 }
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127
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128 // Do the work for __cxa_end_cleanup. Returns the currently propagating
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129 // exception object.
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130 extern "C" _Unwind_Exception *
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131 __gnu_end_cleanup(void)
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132 {
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133 __cxa_exception *header;
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134 __cxa_eh_globals *globals = __cxa_get_globals();
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135
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136 header = globals->propagatingExceptions;
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137
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138 // Check something hasn't gone horribly wrong.
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139 if (!header)
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140 std::terminate();
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141
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142 if (__is_gxx_exception_class(header->unwindHeader.exception_class))
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143 {
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144 header->propagationCount--;
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145 if (header->propagationCount == 0)
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146 {
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147 // Remove exception from chain.
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148 globals->propagatingExceptions = header->nextPropagatingException;
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149 header->nextPropagatingException = NULL;
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150 }
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151 }
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152 else
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153 globals->propagatingExceptions = NULL;
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154
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155 return &header->unwindHeader;
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156 }
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157
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158 #ifdef __TMS320C6X__
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159 // Assembly wrapper to call __gnu_end_cleanup without clobbering
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160 // function arguments to _Unwind_Resume.
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161 asm (".global __cxa_end_cleanup\n"
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162 " .type __cxa_end_cleanup, \"function\"\n"
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163 "__cxa_end_cleanup:\n"
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164 " stw .d2t2 B9, *B15--[10]\n"
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165 " stw .d2t2 B8, *+B15[9]\n"
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166 " stw .d2t2 B7, *+B15[8]\n"
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167 " stw .d2t2 B6, *+B15[7]\n"
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168 " stw .d2t2 B5, *+B15[6]\n"
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169 " stw .d2t2 B4, *+B15[5]\n"
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170 " stw .d2t1 A9, *+B15[4]\n"
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171 " stw .d2t1 A8, *+B15[3]\n"
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172 " stw .d2t1 A7, *+B15[2]\n"
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173 " stw .d2t1 A6, *+B15[1]\n"
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174 #ifdef _TMS320C6400_PLUS
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175 " callp .s2 (__gnu_end_cleanup), B3\n"
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176 #elif defined(_TMS320C6400)
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177 " call .s2 (__gnu_end_cleanup)\n"
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178 " addkpc .s2 1f, B3, 0\n"
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179 " nop 4\n"
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180 "1:\n"
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181 #else
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182 " call .s2 (__gnu_end_cleanup)\n"
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183 " mvkl .s2 1f, B3\n"
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184 " mvkh .s2 1f, B3\n"
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185 " nop 3\n"
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186 "1:\n"
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187 #endif
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188 " ldw .d2t1 *+B15[1], A6\n"
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189 " ldw .d2t1 *+B15[2], A7\n"
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190 " ldw .d2t1 *+B15[3], A8\n"
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191 " ldw .d2t1 *+B15[4], A9\n"
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192 " ldw .d2t2 *+B15[5], B4\n"
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193 " ldw .d2t2 *+B15[6], B5\n"
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194 " ldw .d2t2 *+B15[7], B6\n"
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195 " ldw .d2t2 *+B15[8], B7\n"
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196 " ldw .d2t2 *+B15[9], B8\n"
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197 " ldw .d2t2 *++B15[10], B9\n"
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198 " b .s2 _Unwind_Resume\n"
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199 " nop 5\n");
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200 #else
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201 // Assembly wrapper to call __gnu_end_cleanup without clobbering r1-r3.
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202 // Also push r4 to preserve stack alignment.
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203 #ifdef __thumb__
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204 asm (" .pushsection .text.__cxa_end_cleanup\n"
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205 " .global __cxa_end_cleanup\n"
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206 " .type __cxa_end_cleanup, \"function\"\n"
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207 " .thumb_func\n"
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208 "__cxa_end_cleanup:\n"
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209 " push\t{r1, r2, r3, r4}\n"
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210 " bl\t__gnu_end_cleanup\n"
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211 " pop\t{r1, r2, r3, r4}\n"
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212 " bl\t_Unwind_Resume @ Never returns\n"
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213 " .popsection\n");
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214 #else
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215 asm (" .pushsection .text.__cxa_end_cleanup\n"
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216 " .global __cxa_end_cleanup\n"
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217 " .type __cxa_end_cleanup, \"function\"\n"
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218 "__cxa_end_cleanup:\n"
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219 " stmfd\tsp!, {r1, r2, r3, r4}\n"
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220 " bl\t__gnu_end_cleanup\n"
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221 " ldmfd\tsp!, {r1, r2, r3, r4}\n"
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222 " bl\t_Unwind_Resume @ Never returns\n"
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223 " .popsection\n");
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224 #endif
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225 #endif
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226
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227 #endif
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