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1 /* ARM EABI compliant unwinding routines.
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2 Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
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3 Contributed by Paul Brook
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4
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5 This file is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 3, or (at your option) any
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8 later version.
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9
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10 This file is distributed in the hope that it will be useful, but
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 General Public License for more details.
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14
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15 Under Section 7 of GPL version 3, you are granted additional
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16 permissions described in the GCC Runtime Library Exception, version
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17 3.1, as published by the Free Software Foundation.
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18
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19 You should have received a copy of the GNU General Public License and
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20 a copy of the GCC Runtime Library Exception along with this program;
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21 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 <http://www.gnu.org/licenses/>. */
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23
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24 #include "unwind.h"
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25
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26 /* We add a prototype for abort here to avoid creating a dependency on
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27 target headers. */
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28 extern void abort (void);
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29
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30 /* Definitions for C++ runtime support routines. We make these weak
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31 declarations to avoid pulling in libsupc++ unnecessarily. */
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32 typedef unsigned char bool;
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33
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34 typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
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35
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36 void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
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37 bool __attribute__((weak)) __cxa_begin_cleanup(_Unwind_Control_Block *ucbp);
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38 bool __attribute__((weak)) __cxa_type_match(_Unwind_Control_Block *ucbp,
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39 const type_info *rttip,
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40 bool is_reference,
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41 void **matched_object);
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42
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43 _Unwind_Ptr __attribute__((weak))
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44 __gnu_Unwind_Find_exidx (_Unwind_Ptr, int *);
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45
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46 /* Misc constants. */
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47 #define R_IP 12
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48 #define R_SP 13
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49 #define R_LR 14
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50 #define R_PC 15
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51
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52 #define EXIDX_CANTUNWIND 1
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53 #define uint32_highbit (((_uw) 1) << 31)
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54
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55 #define UCB_FORCED_STOP_FN(ucbp) ((ucbp)->unwinder_cache.reserved1)
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56 #define UCB_PR_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved2)
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57 #define UCB_SAVED_CALLSITE_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved3)
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58 #define UCB_FORCED_STOP_ARG(ucbp) ((ucbp)->unwinder_cache.reserved4)
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59
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60 struct core_regs
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61 {
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62 _uw r[16];
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63 };
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64
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65 /* We use normal integer types here to avoid the compiler generating
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66 coprocessor instructions. */
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67 struct vfp_regs
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68 {
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69 _uw64 d[16];
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70 _uw pad;
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71 };
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72
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73 struct vfpv3_regs
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74 {
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75 /* Always populated via VSTM, so no need for the "pad" field from
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76 vfp_regs (which is used to store the format word for FSTMX). */
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77 _uw64 d[16];
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78 };
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79
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80 struct fpa_reg
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81 {
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82 _uw w[3];
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83 };
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84
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85 struct fpa_regs
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86 {
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87 struct fpa_reg f[8];
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88 };
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89
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90 struct wmmxd_regs
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91 {
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92 _uw64 wd[16];
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93 };
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94
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95 struct wmmxc_regs
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96 {
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97 _uw wc[4];
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98 };
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99
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100 /* Unwind descriptors. */
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101
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102 typedef struct
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103 {
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104 _uw16 length;
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105 _uw16 offset;
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106 } EHT16;
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107
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108 typedef struct
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109 {
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110 _uw length;
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111 _uw offset;
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112 } EHT32;
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113
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114 /* The ABI specifies that the unwind routines may only use core registers,
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115 except when actually manipulating coprocessor state. This allows
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116 us to write one implementation that works on all platforms by
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117 demand-saving coprocessor registers.
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118
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119 During unwinding we hold the coprocessor state in the actual hardware
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120 registers and allocate demand-save areas for use during phase1
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121 unwinding. */
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122
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123 typedef struct
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124 {
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125 /* The first fields must be the same as a phase2_vrs. */
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126 _uw demand_save_flags;
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127 struct core_regs core;
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128 _uw prev_sp; /* Only valid during forced unwinding. */
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129 struct vfp_regs vfp;
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130 struct vfpv3_regs vfp_regs_16_to_31;
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131 struct fpa_regs fpa;
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132 struct wmmxd_regs wmmxd;
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133 struct wmmxc_regs wmmxc;
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134 } phase1_vrs;
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135
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136 #define DEMAND_SAVE_VFP 1 /* VFP state has been saved if not set */
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137 #define DEMAND_SAVE_VFP_D 2 /* VFP state is for FLDMD/FSTMD if set */
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138 #define DEMAND_SAVE_VFP_V3 4 /* VFPv3 state for regs 16 .. 31 has
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139 been saved if not set */
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140 #define DEMAND_SAVE_WMMXD 8 /* iWMMXt data registers have been
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141 saved if not set. */
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142 #define DEMAND_SAVE_WMMXC 16 /* iWMMXt control registers have been
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143 saved if not set. */
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144
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145 /* This must match the structure created by the assembly wrappers. */
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146 typedef struct
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147 {
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148 _uw demand_save_flags;
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149 struct core_regs core;
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150 } phase2_vrs;
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151
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152
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153 /* An exception index table entry. */
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154
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155 typedef struct __EIT_entry
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156 {
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157 _uw fnoffset;
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158 _uw content;
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159 } __EIT_entry;
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160
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161 /* Assembly helper functions. */
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162
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163 /* Restore core register state. Never returns. */
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164 void __attribute__((noreturn)) restore_core_regs (struct core_regs *);
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165
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166
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167 /* Coprocessor register state manipulation functions. */
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168
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169 /* Routines for FLDMX/FSTMX format... */
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170 void __gnu_Unwind_Save_VFP (struct vfp_regs * p);
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171 void __gnu_Unwind_Restore_VFP (struct vfp_regs * p);
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172 void __gnu_Unwind_Save_WMMXD (struct wmmxd_regs * p);
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173 void __gnu_Unwind_Restore_WMMXD (struct wmmxd_regs * p);
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174 void __gnu_Unwind_Save_WMMXC (struct wmmxc_regs * p);
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175 void __gnu_Unwind_Restore_WMMXC (struct wmmxc_regs * p);
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176
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177 /* ...and those for FLDMD/FSTMD format... */
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178 void __gnu_Unwind_Save_VFP_D (struct vfp_regs * p);
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179 void __gnu_Unwind_Restore_VFP_D (struct vfp_regs * p);
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180
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181 /* ...and those for VLDM/VSTM format, saving/restoring only registers
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182 16 through 31. */
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183 void __gnu_Unwind_Save_VFP_D_16_to_31 (struct vfpv3_regs * p);
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184 void __gnu_Unwind_Restore_VFP_D_16_to_31 (struct vfpv3_regs * p);
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185
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186 /* Restore coprocessor state after phase1 unwinding. */
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187 static void
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188 restore_non_core_regs (phase1_vrs * vrs)
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189 {
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190 if ((vrs->demand_save_flags & DEMAND_SAVE_VFP) == 0)
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191 {
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192 if (vrs->demand_save_flags & DEMAND_SAVE_VFP_D)
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193 __gnu_Unwind_Restore_VFP_D (&vrs->vfp);
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194 else
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195 __gnu_Unwind_Restore_VFP (&vrs->vfp);
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196 }
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197
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198 if ((vrs->demand_save_flags & DEMAND_SAVE_VFP_V3) == 0)
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199 __gnu_Unwind_Restore_VFP_D_16_to_31 (&vrs->vfp_regs_16_to_31);
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200
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201 if ((vrs->demand_save_flags & DEMAND_SAVE_WMMXD) == 0)
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202 __gnu_Unwind_Restore_WMMXD (&vrs->wmmxd);
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203 if ((vrs->demand_save_flags & DEMAND_SAVE_WMMXC) == 0)
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204 __gnu_Unwind_Restore_WMMXC (&vrs->wmmxc);
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205 }
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206
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207 /* A better way to do this would probably be to compare the absolute address
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208 with a segment relative relocation of the same symbol. */
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209
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210 extern int __text_start;
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211 extern int __data_start;
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212
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213 /* The exception index table location. */
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214 extern __EIT_entry __exidx_start;
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215 extern __EIT_entry __exidx_end;
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216
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217 /* ABI defined personality routines. */
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218 extern _Unwind_Reason_Code __aeabi_unwind_cpp_pr0 (_Unwind_State,
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219 _Unwind_Control_Block *, _Unwind_Context *);// __attribute__((weak));
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220 extern _Unwind_Reason_Code __aeabi_unwind_cpp_pr1 (_Unwind_State,
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221 _Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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222 extern _Unwind_Reason_Code __aeabi_unwind_cpp_pr2 (_Unwind_State,
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223 _Unwind_Control_Block *, _Unwind_Context *) __attribute__((weak));
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224
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225 /* ABI defined routine to store a virtual register to memory. */
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226
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227 _Unwind_VRS_Result _Unwind_VRS_Get (_Unwind_Context *context,
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228 _Unwind_VRS_RegClass regclass,
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229 _uw regno,
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230 _Unwind_VRS_DataRepresentation representation,
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231 void *valuep)
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232 {
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233 phase1_vrs *vrs = (phase1_vrs *) context;
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234
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235 switch (regclass)
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236 {
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237 case _UVRSC_CORE:
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238 if (representation != _UVRSD_UINT32
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239 || regno > 15)
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240 return _UVRSR_FAILED;
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241 *(_uw *) valuep = vrs->core.r[regno];
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242 return _UVRSR_OK;
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243
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244 case _UVRSC_VFP:
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245 case _UVRSC_FPA:
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246 case _UVRSC_WMMXD:
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247 case _UVRSC_WMMXC:
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248 return _UVRSR_NOT_IMPLEMENTED;
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249
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250 default:
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251 return _UVRSR_FAILED;
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252 }
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253 }
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254
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255
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256 /* ABI defined function to load a virtual register from memory. */
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257
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258 _Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context,
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259 _Unwind_VRS_RegClass regclass,
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260 _uw regno,
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261 _Unwind_VRS_DataRepresentation representation,
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262 void *valuep)
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263 {
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264 phase1_vrs *vrs = (phase1_vrs *) context;
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265
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266 switch (regclass)
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267 {
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268 case _UVRSC_CORE:
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269 if (representation != _UVRSD_UINT32
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270 || regno > 15)
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271 return _UVRSR_FAILED;
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272
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273 vrs->core.r[regno] = *(_uw *) valuep;
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274 return _UVRSR_OK;
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275
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276 case _UVRSC_VFP:
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277 case _UVRSC_FPA:
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278 case _UVRSC_WMMXD:
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279 case _UVRSC_WMMXC:
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280 return _UVRSR_NOT_IMPLEMENTED;
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281
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282 default:
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283 return _UVRSR_FAILED;
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284 }
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285 }
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286
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287
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288 /* ABI defined function to pop registers off the stack. */
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289
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290 _Unwind_VRS_Result _Unwind_VRS_Pop (_Unwind_Context *context,
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291 _Unwind_VRS_RegClass regclass,
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292 _uw discriminator,
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293 _Unwind_VRS_DataRepresentation representation)
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294 {
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295 phase1_vrs *vrs = (phase1_vrs *) context;
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296
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297 switch (regclass)
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298 {
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299 case _UVRSC_CORE:
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300 {
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301 _uw *ptr;
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302 _uw mask;
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303 int i;
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304
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305 if (representation != _UVRSD_UINT32)
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306 return _UVRSR_FAILED;
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307
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308 mask = discriminator & 0xffff;
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309 ptr = (_uw *) vrs->core.r[R_SP];
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310 /* Pop the requested registers. */
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311 for (i = 0; i < 16; i++)
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312 {
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313 if (mask & (1 << i))
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314 vrs->core.r[i] = *(ptr++);
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315 }
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316 /* Writeback the stack pointer value if it wasn't restored. */
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317 if ((mask & (1 << R_SP)) == 0)
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318 vrs->core.r[R_SP] = (_uw) ptr;
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319 }
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320 return _UVRSR_OK;
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321
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322 case _UVRSC_VFP:
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323 {
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324 _uw start = discriminator >> 16;
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325 _uw count = discriminator & 0xffff;
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326 struct vfp_regs tmp;
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327 struct vfpv3_regs tmp_16_to_31;
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328 int tmp_count;
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329 _uw *sp;
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330 _uw *dest;
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331 int num_vfpv3_regs = 0;
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332
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333 /* We use an approximation here by bounding _UVRSD_DOUBLE
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334 register numbers at 32 always, since we can't detect if
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335 VFPv3 isn't present (in such a case the upper limit is 16). */
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336 if ((representation != _UVRSD_VFPX && representation != _UVRSD_DOUBLE)
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337 || start + count > (representation == _UVRSD_VFPX ? 16 : 32)
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338 || (representation == _UVRSD_VFPX && start >= 16))
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339 return _UVRSR_FAILED;
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340
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341 /* Check if we're being asked to pop VFPv3-only registers
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342 (numbers 16 through 31). */
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343 if (start >= 16)
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344 num_vfpv3_regs = count;
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345 else if (start + count > 16)
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346 num_vfpv3_regs = start + count - 16;
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347
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348 if (num_vfpv3_regs && representation != _UVRSD_DOUBLE)
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349 return _UVRSR_FAILED;
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350
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351 /* Demand-save coprocessor registers for stage1. */
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352 if (start < 16 && (vrs->demand_save_flags & DEMAND_SAVE_VFP))
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353 {
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354 vrs->demand_save_flags &= ~DEMAND_SAVE_VFP;
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355
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356 if (representation == _UVRSD_DOUBLE)
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357 {
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358 /* Save in FLDMD/FSTMD format. */
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359 vrs->demand_save_flags |= DEMAND_SAVE_VFP_D;
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360 __gnu_Unwind_Save_VFP_D (&vrs->vfp);
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361 }
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362 else
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363 {
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364 /* Save in FLDMX/FSTMX format. */
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365 vrs->demand_save_flags &= ~DEMAND_SAVE_VFP_D;
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366 __gnu_Unwind_Save_VFP (&vrs->vfp);
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367 }
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368 }
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369
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370 if (num_vfpv3_regs > 0
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371 && (vrs->demand_save_flags & DEMAND_SAVE_VFP_V3))
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372 {
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373 vrs->demand_save_flags &= ~DEMAND_SAVE_VFP_V3;
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374 __gnu_Unwind_Save_VFP_D_16_to_31 (&vrs->vfp_regs_16_to_31);
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375 }
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376
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377 /* Restore the registers from the stack. Do this by saving the
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378 current VFP registers to a memory area, moving the in-memory
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379 values into that area, and restoring from the whole area.
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380 For _UVRSD_VFPX we assume FSTMX standard format 1. */
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381 if (representation == _UVRSD_VFPX)
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382 __gnu_Unwind_Save_VFP (&tmp);
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383 else
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384 {
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385 /* Save registers 0 .. 15 if required. */
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386 if (start < 16)
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387 __gnu_Unwind_Save_VFP_D (&tmp);
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388
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389 /* Save VFPv3 registers 16 .. 31 if required. */
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390 if (num_vfpv3_regs)
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391 __gnu_Unwind_Save_VFP_D_16_to_31 (&tmp_16_to_31);
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392 }
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393
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394 /* Work out how many registers below register 16 need popping. */
|
|
|
395 tmp_count = num_vfpv3_regs > 0 ? 16 - start : count;
|
|
|
396
|
|
|
397 /* Copy registers below 16, if needed.
|
|
|
398 The stack address is only guaranteed to be word aligned, so
|
|
|
399 we can't use doubleword copies. */
|
|
|
400 sp = (_uw *) vrs->core.r[R_SP];
|
|
|
401 if (tmp_count > 0)
|
|
|
402 {
|
|
|
403 tmp_count *= 2;
|
|
|
404 dest = (_uw *) &tmp.d[start];
|
|
|
405 while (tmp_count--)
|
|
|
406 *(dest++) = *(sp++);
|
|
|
407 }
|
|
|
408
|
|
|
409 /* Copy VFPv3 registers numbered >= 16, if needed. */
|
|
|
410 if (num_vfpv3_regs > 0)
|
|
|
411 {
|
|
|
412 /* num_vfpv3_regs is needed below, so copy it. */
|
|
|
413 int tmp_count_2 = num_vfpv3_regs * 2;
|
|
|
414 int vfpv3_start = start < 16 ? 16 : start;
|
|
|
415
|
|
|
416 dest = (_uw *) &tmp_16_to_31.d[vfpv3_start - 16];
|
|
|
417 while (tmp_count_2--)
|
|
|
418 *(dest++) = *(sp++);
|
|
|
419 }
|
|
|
420
|
|
|
421 /* Skip the format word space if using FLDMX/FSTMX format. */
|
|
|
422 if (representation == _UVRSD_VFPX)
|
|
|
423 sp++;
|
|
|
424
|
|
|
425 /* Set the new stack pointer. */
|
|
|
426 vrs->core.r[R_SP] = (_uw) sp;
|
|
|
427
|
|
|
428 /* Reload the registers. */
|
|
|
429 if (representation == _UVRSD_VFPX)
|
|
|
430 __gnu_Unwind_Restore_VFP (&tmp);
|
|
|
431 else
|
|
|
432 {
|
|
|
433 /* Restore registers 0 .. 15 if required. */
|
|
|
434 if (start < 16)
|
|
|
435 __gnu_Unwind_Restore_VFP_D (&tmp);
|
|
|
436
|
|
|
437 /* Restore VFPv3 registers 16 .. 31 if required. */
|
|
|
438 if (num_vfpv3_regs > 0)
|
|
|
439 __gnu_Unwind_Restore_VFP_D_16_to_31 (&tmp_16_to_31);
|
|
|
440 }
|
|
|
441 }
|
|
|
442 return _UVRSR_OK;
|
|
|
443
|
|
|
444 case _UVRSC_FPA:
|
|
|
445 return _UVRSR_NOT_IMPLEMENTED;
|
|
|
446
|
|
|
447 case _UVRSC_WMMXD:
|
|
|
448 {
|
|
|
449 _uw start = discriminator >> 16;
|
|
|
450 _uw count = discriminator & 0xffff;
|
|
|
451 struct wmmxd_regs tmp;
|
|
|
452 _uw *sp;
|
|
|
453 _uw *dest;
|
|
|
454
|
|
|
455 if ((representation != _UVRSD_UINT64) || start + count > 16)
|
|
|
456 return _UVRSR_FAILED;
|
|
|
457
|
|
|
458 if (vrs->demand_save_flags & DEMAND_SAVE_WMMXD)
|
|
|
459 {
|
|
|
460 /* Demand-save resisters for stage1. */
|
|
|
461 vrs->demand_save_flags &= ~DEMAND_SAVE_WMMXD;
|
|
|
462 __gnu_Unwind_Save_WMMXD (&vrs->wmmxd);
|
|
|
463 }
|
|
|
464
|
|
|
465 /* Restore the registers from the stack. Do this by saving the
|
|
|
466 current WMMXD registers to a memory area, moving the in-memory
|
|
|
467 values into that area, and restoring from the whole area. */
|
|
|
468 __gnu_Unwind_Save_WMMXD (&tmp);
|
|
|
469
|
|
|
470 /* The stack address is only guaranteed to be word aligned, so
|
|
|
471 we can't use doubleword copies. */
|
|
|
472 sp = (_uw *) vrs->core.r[R_SP];
|
|
|
473 dest = (_uw *) &tmp.wd[start];
|
|
|
474 count *= 2;
|
|
|
475 while (count--)
|
|
|
476 *(dest++) = *(sp++);
|
|
|
477
|
|
|
478 /* Set the new stack pointer. */
|
|
|
479 vrs->core.r[R_SP] = (_uw) sp;
|
|
|
480
|
|
|
481 /* Reload the registers. */
|
|
|
482 __gnu_Unwind_Restore_WMMXD (&tmp);
|
|
|
483 }
|
|
|
484 return _UVRSR_OK;
|
|
|
485
|
|
|
486 case _UVRSC_WMMXC:
|
|
|
487 {
|
|
|
488 int i;
|
|
|
489 struct wmmxc_regs tmp;
|
|
|
490 _uw *sp;
|
|
|
491
|
|
|
492 if ((representation != _UVRSD_UINT32) || discriminator > 16)
|
|
|
493 return _UVRSR_FAILED;
|
|
|
494
|
|
|
495 if (vrs->demand_save_flags & DEMAND_SAVE_WMMXC)
|
|
|
496 {
|
|
|
497 /* Demand-save resisters for stage1. */
|
|
|
498 vrs->demand_save_flags &= ~DEMAND_SAVE_WMMXC;
|
|
|
499 __gnu_Unwind_Save_WMMXC (&vrs->wmmxc);
|
|
|
500 }
|
|
|
501
|
|
|
502 /* Restore the registers from the stack. Do this by saving the
|
|
|
503 current WMMXC registers to a memory area, moving the in-memory
|
|
|
504 values into that area, and restoring from the whole area. */
|
|
|
505 __gnu_Unwind_Save_WMMXC (&tmp);
|
|
|
506
|
|
|
507 sp = (_uw *) vrs->core.r[R_SP];
|
|
|
508 for (i = 0; i < 4; i++)
|
|
|
509 if (discriminator & (1 << i))
|
|
|
510 tmp.wc[i] = *(sp++);
|
|
|
511
|
|
|
512 /* Set the new stack pointer. */
|
|
|
513 vrs->core.r[R_SP] = (_uw) sp;
|
|
|
514
|
|
|
515 /* Reload the registers. */
|
|
|
516 __gnu_Unwind_Restore_WMMXC (&tmp);
|
|
|
517 }
|
|
|
518 return _UVRSR_OK;
|
|
|
519
|
|
|
520 default:
|
|
|
521 return _UVRSR_FAILED;
|
|
|
522 }
|
|
|
523 }
|
|
|
524
|
|
|
525
|
|
|
526 /* Core unwinding functions. */
|
|
|
527
|
|
|
528 /* Calculate the address encoded by a 31-bit self-relative offset at address
|
|
|
529 P. */
|
|
|
530 static inline _uw
|
|
|
531 selfrel_offset31 (const _uw *p)
|
|
|
532 {
|
|
|
533 _uw offset;
|
|
|
534
|
|
|
535 offset = *p;
|
|
|
536 /* Sign extend to 32 bits. */
|
|
|
537 if (offset & (1 << 30))
|
|
|
538 offset |= 1u << 31;
|
|
|
539 else
|
|
|
540 offset &= ~(1u << 31);
|
|
|
541
|
|
|
542 return offset + (_uw) p;
|
|
|
543 }
|
|
|
544
|
|
|
545
|
|
|
546 /* Perform a binary search for RETURN_ADDRESS in TABLE. The table contains
|
|
|
547 NREC entries. */
|
|
|
548
|
|
|
549 static const __EIT_entry *
|
|
|
550 search_EIT_table (const __EIT_entry * table, int nrec, _uw return_address)
|
|
|
551 {
|
|
|
552 _uw next_fn;
|
|
|
553 _uw this_fn;
|
|
|
554 int n, left, right;
|
|
|
555
|
|
|
556 if (nrec == 0)
|
|
|
557 return (__EIT_entry *) 0;
|
|
|
558
|
|
|
559 left = 0;
|
|
|
560 right = nrec - 1;
|
|
|
561
|
|
|
562 while (1)
|
|
|
563 {
|
|
|
564 n = (left + right) / 2;
|
|
|
565 this_fn = selfrel_offset31 (&table[n].fnoffset);
|
|
|
566 if (n != nrec - 1)
|
|
|
567 next_fn = selfrel_offset31 (&table[n + 1].fnoffset) - 1;
|
|
|
568 else
|
|
|
569 next_fn = (_uw)0 - 1;
|
|
|
570
|
|
|
571 if (return_address < this_fn)
|
|
|
572 {
|
|
|
573 if (n == left)
|
|
|
574 return (__EIT_entry *) 0;
|
|
|
575 right = n - 1;
|
|
|
576 }
|
|
|
577 else if (return_address <= next_fn)
|
|
|
578 return &table[n];
|
|
|
579 else
|
|
|
580 left = n + 1;
|
|
|
581 }
|
|
|
582 }
|
|
|
583
|
|
|
584 /* Find the exception index table eintry for the given address.
|
|
|
585 Fill in the relevant fields of the UCB.
|
|
|
586 Returns _URC_FAILURE if an error occurred, _URC_OK on success. */
|
|
|
587
|
|
|
588 static _Unwind_Reason_Code
|
|
|
589 get_eit_entry (_Unwind_Control_Block *ucbp, _uw return_address)
|
|
|
590 {
|
|
|
591 const __EIT_entry * eitp;
|
|
|
592 int nrec;
|
|
|
593
|
|
|
594 /* The return address is the address of the instruction following the
|
|
|
595 call instruction (plus one in thumb mode). If this was the last
|
|
|
596 instruction in the function the address will lie in the following
|
|
|
597 function. Subtract 2 from the address so that it points within the call
|
|
|
598 instruction itself. */
|
|
|
599 return_address -= 2;
|
|
|
600
|
|
|
601 if (__gnu_Unwind_Find_exidx)
|
|
|
602 {
|
|
|
603 eitp = (const __EIT_entry *) __gnu_Unwind_Find_exidx (return_address,
|
|
|
604 &nrec);
|
|
|
605 if (!eitp)
|
|
|
606 {
|
|
|
607 UCB_PR_ADDR (ucbp) = 0;
|
|
|
608 return _URC_FAILURE;
|
|
|
609 }
|
|
|
610 }
|
|
|
611 else
|
|
|
612 {
|
|
|
613 eitp = &__exidx_start;
|
|
|
614 nrec = &__exidx_end - &__exidx_start;
|
|
|
615 }
|
|
|
616
|
|
|
617 eitp = search_EIT_table (eitp, nrec, return_address);
|
|
|
618
|
|
|
619 if (!eitp)
|
|
|
620 {
|
|
|
621 UCB_PR_ADDR (ucbp) = 0;
|
|
|
622 return _URC_FAILURE;
|
|
|
623 }
|
|
|
624 ucbp->pr_cache.fnstart = selfrel_offset31 (&eitp->fnoffset);
|
|
|
625
|
|
|
626 /* Can this frame be unwound at all? */
|
|
|
627 if (eitp->content == EXIDX_CANTUNWIND)
|
|
|
628 {
|
|
|
629 UCB_PR_ADDR (ucbp) = 0;
|
|
|
630 return _URC_END_OF_STACK;
|
|
|
631 }
|
|
|
632
|
|
|
633 /* Obtain the address of the "real" __EHT_Header word. */
|
|
|
634
|
|
|
635 if (eitp->content & uint32_highbit)
|
|
|
636 {
|
|
|
637 /* It is immediate data. */
|
|
|
638 ucbp->pr_cache.ehtp = (_Unwind_EHT_Header *)&eitp->content;
|
|
|
639 ucbp->pr_cache.additional = 1;
|
|
|
640 }
|
|
|
641 else
|
|
|
642 {
|
|
|
643 /* The low 31 bits of the content field are a self-relative
|
|
|
644 offset to an _Unwind_EHT_Entry structure. */
|
|
|
645 ucbp->pr_cache.ehtp =
|
|
|
646 (_Unwind_EHT_Header *) selfrel_offset31 (&eitp->content);
|
|
|
647 ucbp->pr_cache.additional = 0;
|
|
|
648 }
|
|
|
649
|
|
|
650 /* Discover the personality routine address. */
|
|
|
651 if (*ucbp->pr_cache.ehtp & (1u << 31))
|
|
|
652 {
|
|
|
653 /* One of the predefined standard routines. */
|
|
|
654 _uw idx = (*(_uw *) ucbp->pr_cache.ehtp >> 24) & 0xf;
|
|
|
655 if (idx == 0)
|
|
|
656 UCB_PR_ADDR (ucbp) = (_uw) &__aeabi_unwind_cpp_pr0;
|
|
|
657 else if (idx == 1)
|
|
|
658 UCB_PR_ADDR (ucbp) = (_uw) &__aeabi_unwind_cpp_pr1;
|
|
|
659 else if (idx == 2)
|
|
|
660 UCB_PR_ADDR (ucbp) = (_uw) &__aeabi_unwind_cpp_pr2;
|
|
|
661 else
|
|
|
662 { /* Failed */
|
|
|
663 UCB_PR_ADDR (ucbp) = 0;
|
|
|
664 return _URC_FAILURE;
|
|
|
665 }
|
|
|
666 }
|
|
|
667 else
|
|
|
668 {
|
|
|
669 /* Execute region offset to PR */
|
|
|
670 UCB_PR_ADDR (ucbp) = selfrel_offset31 (ucbp->pr_cache.ehtp);
|
|
|
671 }
|
|
|
672 return _URC_OK;
|
|
|
673 }
|
|
|
674
|
|
|
675
|
|
|
676 /* Perform phase2 unwinding. VRS is the initial virtual register state. */
|
|
|
677
|
|
|
678 static void __attribute__((noreturn))
|
|
|
679 unwind_phase2 (_Unwind_Control_Block * ucbp, phase2_vrs * vrs)
|
|
|
680 {
|
|
|
681 _Unwind_Reason_Code pr_result;
|
|
|
682
|
|
|
683 do
|
|
|
684 {
|
|
|
685 /* Find the entry for this routine. */
|
|
|
686 if (get_eit_entry (ucbp, vrs->core.r[R_PC]) != _URC_OK)
|
|
|
687 abort ();
|
|
|
688
|
|
|
689 UCB_SAVED_CALLSITE_ADDR (ucbp) = vrs->core.r[R_PC];
|
|
|
690
|
|
|
691 /* Call the pr to decide what to do. */
|
|
|
692 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
693 (_US_UNWIND_FRAME_STARTING, ucbp, (_Unwind_Context *) vrs);
|
|
|
694 }
|
|
|
695 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
696
|
|
|
697 if (pr_result != _URC_INSTALL_CONTEXT)
|
|
|
698 abort();
|
|
|
699
|
|
|
700 restore_core_regs (&vrs->core);
|
|
|
701 }
|
|
|
702
|
|
|
703 /* Perform phase2 forced unwinding. */
|
|
|
704
|
|
|
705 static _Unwind_Reason_Code
|
|
|
706 unwind_phase2_forced (_Unwind_Control_Block *ucbp, phase2_vrs *entry_vrs,
|
|
|
707 int resuming)
|
|
|
708 {
|
|
|
709 _Unwind_Stop_Fn stop_fn = (_Unwind_Stop_Fn) UCB_FORCED_STOP_FN (ucbp);
|
|
|
710 void *stop_arg = (void *)UCB_FORCED_STOP_ARG (ucbp);
|
|
|
711 _Unwind_Reason_Code pr_result = 0;
|
|
|
712 /* We use phase1_vrs here even though we do not demand save, for the
|
|
|
713 prev_sp field. */
|
|
|
714 phase1_vrs saved_vrs, next_vrs;
|
|
|
715
|
|
|
716 /* Save the core registers. */
|
|
|
717 saved_vrs.core = entry_vrs->core;
|
|
|
718 /* We don't need to demand-save the non-core registers, because we
|
|
|
719 unwind in a single pass. */
|
|
|
720 saved_vrs.demand_save_flags = 0;
|
|
|
721
|
|
|
722 /* Unwind until we reach a propagation barrier. */
|
|
|
723 do
|
|
|
724 {
|
|
|
725 _Unwind_State action;
|
|
|
726 _Unwind_Reason_Code entry_code;
|
|
|
727 _Unwind_Reason_Code stop_code;
|
|
|
728
|
|
|
729 /* Find the entry for this routine. */
|
|
|
730 entry_code = get_eit_entry (ucbp, saved_vrs.core.r[R_PC]);
|
|
|
731
|
|
|
732 if (resuming)
|
|
|
733 {
|
|
|
734 action = _US_UNWIND_FRAME_RESUME | _US_FORCE_UNWIND;
|
|
|
735 resuming = 0;
|
|
|
736 }
|
|
|
737 else
|
|
|
738 action = _US_UNWIND_FRAME_STARTING | _US_FORCE_UNWIND;
|
|
|
739
|
|
|
740 if (entry_code == _URC_OK)
|
|
|
741 {
|
|
|
742 UCB_SAVED_CALLSITE_ADDR (ucbp) = saved_vrs.core.r[R_PC];
|
|
|
743
|
|
|
744 next_vrs = saved_vrs;
|
|
|
745
|
|
|
746 /* Call the pr to decide what to do. */
|
|
|
747 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
748 (action, ucbp, (void *) &next_vrs);
|
|
|
749
|
|
|
750 saved_vrs.prev_sp = next_vrs.core.r[R_SP];
|
|
|
751 }
|
|
|
752 else
|
|
|
753 {
|
|
|
754 /* Treat any failure as the end of unwinding, to cope more
|
|
|
755 gracefully with missing EH information. Mixed EH and
|
|
|
756 non-EH within one object will usually result in failure,
|
|
|
757 because the .ARM.exidx tables do not indicate the end
|
|
|
758 of the code to which they apply; but mixed EH and non-EH
|
|
|
759 shared objects should return an unwind failure at the
|
|
|
760 entry of a non-EH shared object. */
|
|
|
761 action |= _US_END_OF_STACK;
|
|
|
762
|
|
|
763 saved_vrs.prev_sp = saved_vrs.core.r[R_SP];
|
|
|
764 }
|
|
|
765
|
|
|
766 stop_code = stop_fn (1, action, ucbp->exception_class, ucbp,
|
|
|
767 (void *)&saved_vrs, stop_arg);
|
|
|
768 if (stop_code != _URC_NO_REASON)
|
|
|
769 return _URC_FAILURE;
|
|
|
770
|
|
|
771 if (entry_code != _URC_OK)
|
|
|
772 return entry_code;
|
|
|
773
|
|
|
774 saved_vrs = next_vrs;
|
|
|
775 }
|
|
|
776 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
777
|
|
|
778 if (pr_result != _URC_INSTALL_CONTEXT)
|
|
|
779 {
|
|
|
780 /* Some sort of failure has occurred in the pr and probably the
|
|
|
781 pr returned _URC_FAILURE. */
|
|
|
782 return _URC_FAILURE;
|
|
|
783 }
|
|
|
784
|
|
|
785 restore_core_regs (&saved_vrs.core);
|
|
|
786 }
|
|
|
787
|
|
|
788 /* This is a very limited implementation of _Unwind_GetCFA. It returns
|
|
|
789 the stack pointer as it is about to be unwound, and is only valid
|
|
|
790 while calling the stop function during forced unwinding. If the
|
|
|
791 current personality routine result is going to run a cleanup, this
|
|
|
792 will not be the CFA; but when the frame is really unwound, it will
|
|
|
793 be. */
|
|
|
794
|
|
|
795 _Unwind_Word
|
|
|
796 _Unwind_GetCFA (_Unwind_Context *context)
|
|
|
797 {
|
|
|
798 return ((phase1_vrs *) context)->prev_sp;
|
|
|
799 }
|
|
|
800
|
|
|
801 /* Perform phase1 unwinding. UCBP is the exception being thrown, and
|
|
|
802 entry_VRS is the register state on entry to _Unwind_RaiseException. */
|
|
|
803
|
|
|
804 _Unwind_Reason_Code
|
|
|
805 __gnu_Unwind_RaiseException (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
806
|
|
|
807 _Unwind_Reason_Code
|
|
|
808 __gnu_Unwind_RaiseException (_Unwind_Control_Block * ucbp,
|
|
|
809 phase2_vrs * entry_vrs)
|
|
|
810 {
|
|
|
811 phase1_vrs saved_vrs;
|
|
|
812 _Unwind_Reason_Code pr_result;
|
|
|
813
|
|
|
814 /* Set the pc to the call site. */
|
|
|
815 entry_vrs->core.r[R_PC] = entry_vrs->core.r[R_LR];
|
|
|
816
|
|
|
817 /* Save the core registers. */
|
|
|
818 saved_vrs.core = entry_vrs->core;
|
|
|
819 /* Set demand-save flags. */
|
|
|
820 saved_vrs.demand_save_flags = ~(_uw) 0;
|
|
|
821
|
|
|
822 /* Unwind until we reach a propagation barrier. */
|
|
|
823 do
|
|
|
824 {
|
|
|
825 /* Find the entry for this routine. */
|
|
|
826 if (get_eit_entry (ucbp, saved_vrs.core.r[R_PC]) != _URC_OK)
|
|
|
827 return _URC_FAILURE;
|
|
|
828
|
|
|
829 /* Call the pr to decide what to do. */
|
|
|
830 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
831 (_US_VIRTUAL_UNWIND_FRAME, ucbp, (void *) &saved_vrs);
|
|
|
832 }
|
|
|
833 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
834
|
|
|
835 /* We've unwound as far as we want to go, so restore the original
|
|
|
836 register state. */
|
|
|
837 restore_non_core_regs (&saved_vrs);
|
|
|
838 if (pr_result != _URC_HANDLER_FOUND)
|
|
|
839 {
|
|
|
840 /* Some sort of failure has occurred in the pr and probably the
|
|
|
841 pr returned _URC_FAILURE. */
|
|
|
842 return _URC_FAILURE;
|
|
|
843 }
|
|
|
844
|
|
|
845 unwind_phase2 (ucbp, entry_vrs);
|
|
|
846 }
|
|
|
847
|
|
|
848 /* Resume unwinding after a cleanup has been run. UCBP is the exception
|
|
|
849 being thrown and ENTRY_VRS is the register state on entry to
|
|
|
850 _Unwind_Resume. */
|
|
|
851 _Unwind_Reason_Code
|
|
|
852 __gnu_Unwind_ForcedUnwind (_Unwind_Control_Block *,
|
|
|
853 _Unwind_Stop_Fn, void *, phase2_vrs *);
|
|
|
854
|
|
|
855 _Unwind_Reason_Code
|
|
|
856 __gnu_Unwind_ForcedUnwind (_Unwind_Control_Block *ucbp,
|
|
|
857 _Unwind_Stop_Fn stop_fn, void *stop_arg,
|
|
|
858 phase2_vrs *entry_vrs)
|
|
|
859 {
|
|
|
860 UCB_FORCED_STOP_FN (ucbp) = (_uw) stop_fn;
|
|
|
861 UCB_FORCED_STOP_ARG (ucbp) = (_uw) stop_arg;
|
|
|
862
|
|
|
863 /* Set the pc to the call site. */
|
|
|
864 entry_vrs->core.r[R_PC] = entry_vrs->core.r[R_LR];
|
|
|
865
|
|
|
866 return unwind_phase2_forced (ucbp, entry_vrs, 0);
|
|
|
867 }
|
|
|
868
|
|
|
869 _Unwind_Reason_Code
|
|
|
870 __gnu_Unwind_Resume (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
871
|
|
|
872 _Unwind_Reason_Code
|
|
|
873 __gnu_Unwind_Resume (_Unwind_Control_Block * ucbp, phase2_vrs * entry_vrs)
|
|
|
874 {
|
|
|
875 _Unwind_Reason_Code pr_result;
|
|
|
876
|
|
|
877 /* Recover the saved address. */
|
|
|
878 entry_vrs->core.r[R_PC] = UCB_SAVED_CALLSITE_ADDR (ucbp);
|
|
|
879
|
|
|
880 if (UCB_FORCED_STOP_FN (ucbp))
|
|
|
881 {
|
|
|
882 unwind_phase2_forced (ucbp, entry_vrs, 1);
|
|
|
883
|
|
|
884 /* We can't return failure at this point. */
|
|
|
885 abort ();
|
|
|
886 }
|
|
|
887
|
|
|
888 /* Call the cached PR. */
|
|
|
889 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
890 (_US_UNWIND_FRAME_RESUME, ucbp, (_Unwind_Context *) entry_vrs);
|
|
|
891
|
|
|
892 switch (pr_result)
|
|
|
893 {
|
|
|
894 case _URC_INSTALL_CONTEXT:
|
|
|
895 /* Upload the registers to enter the landing pad. */
|
|
|
896 restore_core_regs (&entry_vrs->core);
|
|
|
897
|
|
|
898 case _URC_CONTINUE_UNWIND:
|
|
|
899 /* Continue unwinding the next frame. */
|
|
|
900 unwind_phase2 (ucbp, entry_vrs);
|
|
|
901
|
|
|
902 default:
|
|
|
903 abort ();
|
|
|
904 }
|
|
|
905 }
|
|
|
906
|
|
|
907 _Unwind_Reason_Code
|
|
|
908 __gnu_Unwind_Resume_or_Rethrow (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
909
|
|
|
910 _Unwind_Reason_Code
|
|
|
911 __gnu_Unwind_Resume_or_Rethrow (_Unwind_Control_Block * ucbp,
|
|
|
912 phase2_vrs * entry_vrs)
|
|
|
913 {
|
|
|
914 if (!UCB_FORCED_STOP_FN (ucbp))
|
|
|
915 return __gnu_Unwind_RaiseException (ucbp, entry_vrs);
|
|
|
916
|
|
|
917 /* Set the pc to the call site. */
|
|
|
918 entry_vrs->core.r[R_PC] = entry_vrs->core.r[R_LR];
|
|
|
919 /* Continue unwinding the next frame. */
|
|
|
920 return unwind_phase2_forced (ucbp, entry_vrs, 0);
|
|
|
921 }
|
|
|
922
|
|
|
923 /* Clean up an exception object when unwinding is complete. */
|
|
|
924 void
|
|
|
925 _Unwind_Complete (_Unwind_Control_Block * ucbp __attribute__((unused)))
|
|
|
926 {
|
|
|
927 }
|
|
|
928
|
|
|
929
|
|
|
930 /* Get the _Unwind_Control_Block from an _Unwind_Context. */
|
|
|
931
|
|
|
932 static inline _Unwind_Control_Block *
|
|
|
933 unwind_UCB_from_context (_Unwind_Context * context)
|
|
|
934 {
|
|
|
935 return (_Unwind_Control_Block *) _Unwind_GetGR (context, R_IP);
|
|
|
936 }
|
|
|
937
|
|
|
938
|
|
|
939 /* Free an exception. */
|
|
|
940
|
|
|
941 void
|
|
|
942 _Unwind_DeleteException (_Unwind_Exception * exc)
|
|
|
943 {
|
|
|
944 if (exc->exception_cleanup)
|
|
|
945 (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
|
|
|
946 }
|
|
|
947
|
|
|
948
|
|
|
949 /* Perform stack backtrace through unwind data. */
|
|
|
950 _Unwind_Reason_Code
|
|
|
951 __gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
|
|
|
952 phase2_vrs * entry_vrs);
|
|
|
953 _Unwind_Reason_Code
|
|
|
954 __gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
|
|
|
955 phase2_vrs * entry_vrs)
|
|
|
956 {
|
|
|
957 phase1_vrs saved_vrs;
|
|
|
958 _Unwind_Reason_Code code;
|
|
|
959
|
|
|
960 _Unwind_Control_Block ucb;
|
|
|
961 _Unwind_Control_Block *ucbp = &ucb;
|
|
|
962
|
|
|
963 /* Set the pc to the call site. */
|
|
|
964 entry_vrs->core.r[R_PC] = entry_vrs->core.r[R_LR];
|
|
|
965
|
|
|
966 /* Save the core registers. */
|
|
|
967 saved_vrs.core = entry_vrs->core;
|
|
|
968 /* Set demand-save flags. */
|
|
|
969 saved_vrs.demand_save_flags = ~(_uw) 0;
|
|
|
970
|
|
|
971 do
|
|
|
972 {
|
|
|
973 /* Find the entry for this routine. */
|
|
|
974 if (get_eit_entry (ucbp, saved_vrs.core.r[R_PC]) != _URC_OK)
|
|
|
975 {
|
|
|
976 code = _URC_FAILURE;
|
|
|
977 break;
|
|
|
978 }
|
|
|
979
|
|
|
980 /* The dwarf unwinder assumes the context structure holds things
|
|
|
981 like the function and LSDA pointers. The ARM implementation
|
|
|
982 caches these in the exception header (UCB). To avoid
|
|
|
983 rewriting everything we make the virtual IP register point at
|
|
|
984 the UCB. */
|
|
|
985 _Unwind_SetGR((_Unwind_Context *)&saved_vrs, 12, (_Unwind_Ptr) ucbp);
|
|
|
986
|
|
|
987 /* Call trace function. */
|
|
|
988 if ((*trace) ((_Unwind_Context *) &saved_vrs, trace_argument)
|
|
|
989 != _URC_NO_REASON)
|
|
|
990 {
|
|
|
991 code = _URC_FAILURE;
|
|
|
992 break;
|
|
|
993 }
|
|
|
994
|
|
|
995 /* Call the pr to decide what to do. */
|
|
|
996 code = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
997 (_US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND,
|
|
|
998 ucbp, (void *) &saved_vrs);
|
|
|
999 }
|
|
|
1000 while (code != _URC_END_OF_STACK
|
|
|
1001 && code != _URC_FAILURE);
|
|
|
1002
|
|
|
1003 finish:
|
|
|
1004 restore_non_core_regs (&saved_vrs);
|
|
|
1005 return code;
|
|
|
1006 }
|
|
|
1007
|
|
|
1008
|
|
|
1009 /* Common implementation for ARM ABI defined personality routines.
|
|
|
1010 ID is the index of the personality routine, other arguments are as defined
|
|
|
1011 by __aeabi_unwind_cpp_pr{0,1,2}. */
|
|
|
1012
|
|
|
1013 static _Unwind_Reason_Code
|
|
|
1014 __gnu_unwind_pr_common (_Unwind_State state,
|
|
|
1015 _Unwind_Control_Block *ucbp,
|
|
|
1016 _Unwind_Context *context,
|
|
|
1017 int id)
|
|
|
1018 {
|
|
|
1019 __gnu_unwind_state uws;
|
|
|
1020 _uw *data;
|
|
|
1021 _uw offset;
|
|
|
1022 _uw len;
|
|
|
1023 _uw rtti_count;
|
|
|
1024 int phase2_call_unexpected_after_unwind = 0;
|
|
|
1025 int in_range = 0;
|
|
|
1026 int forced_unwind = state & _US_FORCE_UNWIND;
|
|
|
1027
|
|
|
1028 state &= _US_ACTION_MASK;
|
|
|
1029
|
|
|
1030 data = (_uw *) ucbp->pr_cache.ehtp;
|
|
|
1031 uws.data = *(data++);
|
|
|
1032 uws.next = data;
|
|
|
1033 if (id == 0)
|
|
|
1034 {
|
|
|
1035 uws.data <<= 8;
|
|
|
1036 uws.words_left = 0;
|
|
|
1037 uws.bytes_left = 3;
|
|
|
1038 }
|
|
|
1039 else
|
|
|
1040 {
|
|
|
1041 uws.words_left = (uws.data >> 16) & 0xff;
|
|
|
1042 uws.data <<= 16;
|
|
|
1043 uws.bytes_left = 2;
|
|
|
1044 data += uws.words_left;
|
|
|
1045 }
|
|
|
1046
|
|
|
1047 /* Restore the saved pointer. */
|
|
|
1048 if (state == _US_UNWIND_FRAME_RESUME)
|
|
|
1049 data = (_uw *) ucbp->cleanup_cache.bitpattern[0];
|
|
|
1050
|
|
|
1051 if ((ucbp->pr_cache.additional & 1) == 0)
|
|
|
1052 {
|
|
|
1053 /* Process descriptors. */
|
|
|
1054 while (*data)
|
|
|
1055 {
|
|
|
1056 _uw addr;
|
|
|
1057 _uw fnstart;
|
|
|
1058
|
|
|
1059 if (id == 2)
|
|
|
1060 {
|
|
|
1061 len = ((EHT32 *) data)->length;
|
|
|
1062 offset = ((EHT32 *) data)->offset;
|
|
|
1063 data += 2;
|
|
|
1064 }
|
|
|
1065 else
|
|
|
1066 {
|
|
|
1067 len = ((EHT16 *) data)->length;
|
|
|
1068 offset = ((EHT16 *) data)->offset;
|
|
|
1069 data++;
|
|
|
1070 }
|
|
|
1071
|
|
|
1072 fnstart = ucbp->pr_cache.fnstart + (offset & ~1);
|
|
|
1073 addr = _Unwind_GetGR (context, R_PC);
|
|
|
1074 in_range = (fnstart <= addr && addr < fnstart + (len & ~1));
|
|
|
1075
|
|
|
1076 switch (((offset & 1) << 1) | (len & 1))
|
|
|
1077 {
|
|
|
1078 case 0:
|
|
|
1079 /* Cleanup. */
|
|
|
1080 if (state != _US_VIRTUAL_UNWIND_FRAME
|
|
|
1081 && in_range)
|
|
|
1082 {
|
|
|
1083 /* Cleanup in range, and we are running cleanups. */
|
|
|
1084 _uw lp;
|
|
|
1085
|
|
|
1086 /* Landing pad address is 31-bit pc-relative offset. */
|
|
|
1087 lp = selfrel_offset31 (data);
|
|
|
1088 data++;
|
|
|
1089 /* Save the exception data pointer. */
|
|
|
1090 ucbp->cleanup_cache.bitpattern[0] = (_uw) data;
|
|
|
1091 if (!__cxa_begin_cleanup (ucbp))
|
|
|
1092 return _URC_FAILURE;
|
|
|
1093 /* Setup the VRS to enter the landing pad. */
|
|
|
1094 _Unwind_SetGR (context, R_PC, lp);
|
|
|
1095 return _URC_INSTALL_CONTEXT;
|
|
|
1096 }
|
|
|
1097 /* Cleanup not in range, or we are in stage 1. */
|
|
|
1098 data++;
|
|
|
1099 break;
|
|
|
1100
|
|
|
1101 case 1:
|
|
|
1102 /* Catch handler. */
|
|
|
1103 if (state == _US_VIRTUAL_UNWIND_FRAME)
|
|
|
1104 {
|
|
|
1105 if (in_range)
|
|
|
1106 {
|
|
|
1107 /* Check for a barrier. */
|
|
|
1108 _uw rtti;
|
|
|
1109 bool is_reference = (data[0] & uint32_highbit) != 0;
|
|
|
1110 void *matched;
|
|
|
1111
|
|
|
1112 /* Check for no-throw areas. */
|
|
|
1113 if (data[1] == (_uw) -2)
|
|
|
1114 return _URC_FAILURE;
|
|
|
1115
|
|
|
1116 /* The thrown object immediately follows the ECB. */
|
|
|
1117 matched = (void *)(ucbp + 1);
|
|
|
1118 if (data[1] != (_uw) -1)
|
|
|
1119 {
|
|
|
1120 /* Match a catch specification. */
|
|
|
1121 rtti = _Unwind_decode_target2 ((_uw) &data[1]);
|
|
|
1122 if (!__cxa_type_match (ucbp, (type_info *) rtti,
|
|
|
1123 is_reference,
|
|
|
1124 &matched))
|
|
|
1125 matched = (void *)0;
|
|
|
1126 }
|
|
|
1127
|
|
|
1128 if (matched)
|
|
|
1129 {
|
|
|
1130 ucbp->barrier_cache.sp =
|
|
|
1131 _Unwind_GetGR (context, R_SP);
|
|
|
1132 ucbp->barrier_cache.bitpattern[0] = (_uw) matched;
|
|
|
1133 ucbp->barrier_cache.bitpattern[1] = (_uw) data;
|
|
|
1134 return _URC_HANDLER_FOUND;
|
|
|
1135 }
|
|
|
1136 }
|
|
|
1137 /* Handler out of range, or not matched. */
|
|
|
1138 }
|
|
|
1139 else if (ucbp->barrier_cache.sp == _Unwind_GetGR (context, R_SP)
|
|
|
1140 && ucbp->barrier_cache.bitpattern[1] == (_uw) data)
|
|
|
1141 {
|
|
|
1142 /* Matched a previous propagation barrier. */
|
|
|
1143 _uw lp;
|
|
|
1144
|
|
|
1145 /* Setup for entry to the handler. */
|
|
|
1146 lp = selfrel_offset31 (data);
|
|
|
1147 _Unwind_SetGR (context, R_PC, lp);
|
|
|
1148 _Unwind_SetGR (context, 0, (_uw) ucbp);
|
|
|
1149 return _URC_INSTALL_CONTEXT;
|
|
|
1150 }
|
|
|
1151 /* Catch handler not matched. Advance to the next descriptor. */
|
|
|
1152 data += 2;
|
|
|
1153 break;
|
|
|
1154
|
|
|
1155 case 2:
|
|
|
1156 rtti_count = data[0] & 0x7fffffff;
|
|
|
1157 /* Exception specification. */
|
|
|
1158 if (state == _US_VIRTUAL_UNWIND_FRAME)
|
|
|
1159 {
|
|
|
1160 if (in_range && (!forced_unwind || !rtti_count))
|
|
|
1161 {
|
|
|
1162 /* Match against the exception specification. */
|
|
|
1163 _uw i;
|
|
|
1164 _uw rtti;
|
|
|
1165 void *matched;
|
|
|
1166
|
|
|
1167 for (i = 0; i < rtti_count; i++)
|
|
|
1168 {
|
|
|
1169 matched = (void *)(ucbp + 1);
|
|
|
1170 rtti = _Unwind_decode_target2 ((_uw) &data[i + 1]);
|
|
|
1171 if (__cxa_type_match (ucbp, (type_info *) rtti, 0,
|
|
|
1172 &matched))
|
|
|
1173 break;
|
|
|
1174 }
|
|
|
1175
|
|
|
1176 if (i == rtti_count)
|
|
|
1177 {
|
|
|
1178 /* Exception does not match the spec. */
|
|
|
1179 ucbp->barrier_cache.sp =
|
|
|
1180 _Unwind_GetGR (context, R_SP);
|
|
|
1181 ucbp->barrier_cache.bitpattern[0] = (_uw) matched;
|
|
|
1182 ucbp->barrier_cache.bitpattern[1] = (_uw) data;
|
|
|
1183 return _URC_HANDLER_FOUND;
|
|
|
1184 }
|
|
|
1185 }
|
|
|
1186 /* Handler out of range, or exception is permitted. */
|
|
|
1187 }
|
|
|
1188 else if (ucbp->barrier_cache.sp == _Unwind_GetGR (context, R_SP)
|
|
|
1189 && ucbp->barrier_cache.bitpattern[1] == (_uw) data)
|
|
|
1190 {
|
|
|
1191 /* Matched a previous propagation barrier. */
|
|
|
1192 _uw lp;
|
|
|
1193 /* Record the RTTI list for __cxa_call_unexpected. */
|
|
|
1194 ucbp->barrier_cache.bitpattern[1] = rtti_count;
|
|
|
1195 ucbp->barrier_cache.bitpattern[2] = 0;
|
|
|
1196 ucbp->barrier_cache.bitpattern[3] = 4;
|
|
|
1197 ucbp->barrier_cache.bitpattern[4] = (_uw) &data[1];
|
|
|
1198
|
|
|
1199 if (data[0] & uint32_highbit)
|
|
|
1200 phase2_call_unexpected_after_unwind = 1;
|
|
|
1201 else
|
|
|
1202 {
|
|
|
1203 data += rtti_count + 1;
|
|
|
1204 /* Setup for entry to the handler. */
|
|
|
1205 lp = selfrel_offset31 (data);
|
|
|
1206 data++;
|
|
|
1207 _Unwind_SetGR (context, R_PC, lp);
|
|
|
1208 _Unwind_SetGR (context, 0, (_uw) ucbp);
|
|
|
1209 return _URC_INSTALL_CONTEXT;
|
|
|
1210 }
|
|
|
1211 }
|
|
|
1212 if (data[0] & uint32_highbit)
|
|
|
1213 data++;
|
|
|
1214 data += rtti_count + 1;
|
|
|
1215 break;
|
|
|
1216
|
|
|
1217 default:
|
|
|
1218 /* Should never happen. */
|
|
|
1219 return _URC_FAILURE;
|
|
|
1220 }
|
|
|
1221 /* Finished processing this descriptor. */
|
|
|
1222 }
|
|
|
1223 }
|
|
|
1224
|
|
|
1225 if (__gnu_unwind_execute (context, &uws) != _URC_OK)
|
|
|
1226 return _URC_FAILURE;
|
|
|
1227
|
|
|
1228 if (phase2_call_unexpected_after_unwind)
|
|
|
1229 {
|
|
|
1230 /* Enter __cxa_unexpected as if called from the call site. */
|
|
|
1231 _Unwind_SetGR (context, R_LR, _Unwind_GetGR (context, R_PC));
|
|
|
1232 _Unwind_SetGR (context, R_PC, (_uw) &__cxa_call_unexpected);
|
|
|
1233 return _URC_INSTALL_CONTEXT;
|
|
|
1234 }
|
|
|
1235
|
|
|
1236 return _URC_CONTINUE_UNWIND;
|
|
|
1237 }
|
|
|
1238
|
|
|
1239
|
|
|
1240 /* ABI defined personality routine entry points. */
|
|
|
1241
|
|
|
1242 _Unwind_Reason_Code
|
|
|
1243 __aeabi_unwind_cpp_pr0 (_Unwind_State state,
|
|
|
1244 _Unwind_Control_Block *ucbp,
|
|
|
1245 _Unwind_Context *context)
|
|
|
1246 {
|
|
|
1247 return __gnu_unwind_pr_common (state, ucbp, context, 0);
|
|
|
1248 }
|
|
|
1249
|
|
|
1250 _Unwind_Reason_Code
|
|
|
1251 __aeabi_unwind_cpp_pr1 (_Unwind_State state,
|
|
|
1252 _Unwind_Control_Block *ucbp,
|
|
|
1253 _Unwind_Context *context)
|
|
|
1254 {
|
|
|
1255 return __gnu_unwind_pr_common (state, ucbp, context, 1);
|
|
|
1256 }
|
|
|
1257
|
|
|
1258 _Unwind_Reason_Code
|
|
|
1259 __aeabi_unwind_cpp_pr2 (_Unwind_State state,
|
|
|
1260 _Unwind_Control_Block *ucbp,
|
|
|
1261 _Unwind_Context *context)
|
|
|
1262 {
|
|
|
1263 return __gnu_unwind_pr_common (state, ucbp, context, 2);
|
|
|
1264 }
|
