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111
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1 /* Common unwinding code for ARM EABI and C6X.
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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 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 "tconfig.h"
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25 #include "tsystem.h"
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26 #include "unwind.h"
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27
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28 /* Used for SystemTap unwinder probe. */
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29 #ifdef HAVE_SYS_SDT_H
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30 #include <sys/sdt.h>
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31 #endif
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32
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145
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33 #if __FDPIC__
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34 /* Load r7 with rt_sigreturn value. */
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35 #define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad /* mov r7, #0xad */
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36 #define THUMB2_SET_R7_RT_SIGRETURN 0x07adf04f /* mov.w r7, #0xad */
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37
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38 /* FDPIC jump to restorer sequence. */
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39 #define FDPIC_LDR_R12_WITH_FUNCDESC 0xe59fc004 /* ldr r12, [pc, #4] */
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40 #define FDPIC_LDR_R9_WITH_GOT 0xe59c9004 /* ldr r9, [r12, #4] */
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41 #define FDPIC_LDR_PC_WITH_RESTORER 0xe59cf000 /* ldr pc, [r12] */
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42 #define FDPIC_T2_LDR_R12_WITH_FUNCDESC 0xc008f8df /* ldr.w r12, [pc, #8] */
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43 #define FDPIC_T2_LDR_R9_WITH_GOT 0x9004f8dc /* ldr.w r9, [r12, #4] */
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44 #define FDPIC_T2_LDR_PC_WITH_RESTORER 0xf000f8dc /* ldr.w pc, [r12] */
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45 #define FDPIC_FUNCDESC_OFFSET 12
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46
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47 /* Signal frame offsets. */
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48 #define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80
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49 #define ARM_UCONTEXT_SIGCONTEXT 0x14
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50 #define ARM_SIGCONTEXT_R0 0xc
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51 #endif
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52
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111
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53 /* We add a prototype for abort here to avoid creating a dependency on
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54 target headers. */
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55 extern void abort (void);
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56
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57 /* Definitions for C++ runtime support routines. We make these weak
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58 declarations to avoid pulling in libsupc++ unnecessarily. */
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59 typedef unsigned char bool;
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60
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61 typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
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62 enum __cxa_type_match_result
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63 {
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64 ctm_failed = 0,
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65 ctm_succeeded = 1,
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66 ctm_succeeded_with_ptr_to_base = 2
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67 };
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68
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69 void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
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70 bool __attribute__((weak)) __cxa_begin_cleanup(_Unwind_Control_Block *ucbp);
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71 enum __cxa_type_match_result __attribute__((weak)) __cxa_type_match
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72 (_Unwind_Control_Block *ucbp, const type_info *rttip,
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73 bool is_reference, void **matched_object);
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74
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75 _Unwind_Ptr __attribute__((weak))
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76 __gnu_Unwind_Find_exidx (_Unwind_Ptr, int *);
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77
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78 #define EXIDX_CANTUNWIND 1
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79 #define uint32_highbit (((_uw) 1) << 31)
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80
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81 #define UCB_FORCED_STOP_FN(ucbp) ((ucbp)->unwinder_cache.reserved1)
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82 #define UCB_PR_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved2)
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83 #define UCB_SAVED_CALLSITE_ADDR(ucbp) ((ucbp)->unwinder_cache.reserved3)
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84 #define UCB_FORCED_STOP_ARG(ucbp) ((ucbp)->unwinder_cache.reserved4)
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145
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85 #define UCB_PR_GOT(ucbp) ((ucbp)->unwinder_cache.reserved5)
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111
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86
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87 /* Unwind descriptors. */
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88
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89 typedef struct
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90 {
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91 _uw16 length;
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92 _uw16 offset;
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93 } EHT16;
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94
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95 typedef struct
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96 {
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97 _uw length;
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98 _uw offset;
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99 } EHT32;
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100
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101 /* An exception index table entry. */
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102
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103 typedef struct __EIT_entry
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104 {
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105 _uw fnoffset;
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106 _uw content;
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107 } __EIT_entry;
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108
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145
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109 #ifdef __FDPIC__
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110
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111 /* Only used in FDPIC case. */
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112 struct funcdesc_t
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113 {
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114 unsigned int ptr;
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115 unsigned int got;
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116 };
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117 #endif
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118
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111
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119 /* Assembly helper functions. */
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120
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121 /* Restore core register state. Never returns. */
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122 void __attribute__((noreturn)) restore_core_regs (struct core_regs *);
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123
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124
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125 /* Restore coprocessor state after phase1 unwinding. */
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126 static void restore_non_core_regs (phase1_vrs * vrs);
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127
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128 /* A better way to do this would probably be to compare the absolute address
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129 with a segment relative relocation of the same symbol. */
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130
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131 extern int __text_start;
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132 extern int __data_start;
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133
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134 /* The exception index table location. */
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135 extern __EIT_entry __exidx_start;
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136 extern __EIT_entry __exidx_end;
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137
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138 /* Core unwinding functions. */
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139
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140 /* Calculate the address encoded by a 31-bit self-relative offset at address
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141 P. */
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142 static inline _uw selfrel_offset31 (const _uw *p);
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143
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144 static _uw __gnu_unwind_get_pr_addr (int idx);
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145
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146 static void _Unwind_DebugHook (void *, void *)
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147 __attribute__ ((__noinline__, __used__, __noclone__));
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148
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149 /* This function is called during unwinding. It is intended as a hook
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150 for a debugger to intercept exceptions. CFA is the CFA of the
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151 target frame. HANDLER is the PC to which control will be
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152 transferred. */
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153
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154 static void
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155 _Unwind_DebugHook (void *cfa __attribute__ ((__unused__)),
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156 void *handler __attribute__ ((__unused__)))
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157 {
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158 /* We only want to use stap probes starting with v3. Earlier
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159 versions added too much startup cost. */
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160 #if defined (HAVE_SYS_SDT_H) && defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3
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161 STAP_PROBE2 (libgcc, unwind, cfa, handler);
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162 #else
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163 asm ("");
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164 #endif
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165 }
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166
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167 /* This is a wrapper to be called when we need to restore core registers.
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168 It will call `_Unwind_DebugHook' before restoring the registers, thus
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169 making it possible to intercept and debug exceptions.
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170
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171 When calling `_Unwind_DebugHook', the first argument (the CFA) is zero
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172 because we are not interested in it. However, it must be there (even
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173 being zero) because GDB expects to find it when using the probe. */
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174
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175 #define uw_restore_core_regs(TARGET, CORE) \
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176 do \
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177 { \
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178 void *handler = __builtin_frob_return_addr ((void *) VRS_PC (TARGET)); \
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179 _Unwind_DebugHook (0, handler); \
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180 restore_core_regs (CORE); \
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181 } \
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182 while (0)
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183
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184 /* Perform a binary search for RETURN_ADDRESS in TABLE. The table contains
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185 NREC entries. */
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186
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187 static const __EIT_entry *
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188 search_EIT_table (const __EIT_entry * table, int nrec, _uw return_address)
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189 {
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190 _uw next_fn;
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191 _uw this_fn;
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192 int n, left, right;
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193
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194 if (nrec == 0)
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195 return (__EIT_entry *) 0;
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196
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197 left = 0;
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198 right = nrec - 1;
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199
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200 while (1)
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201 {
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202 n = (left + right) / 2;
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203 this_fn = selfrel_offset31 (&table[n].fnoffset);
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204 if (n != nrec - 1)
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205 next_fn = selfrel_offset31 (&table[n + 1].fnoffset) - 1;
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206 else
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207 next_fn = (_uw)0 - 1;
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208
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209 if (return_address < this_fn)
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210 {
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211 if (n == left)
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212 return (__EIT_entry *) 0;
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213 right = n - 1;
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214 }
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215 else if (return_address <= next_fn)
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216 return &table[n];
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217 else
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218 left = n + 1;
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219 }
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220 }
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221
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145
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222 #if __FDPIC__
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223 /* VFP is not restored, but this is sufficient to allow unwinding. */
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224 static _Unwind_Reason_Code
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225 __gnu_personality_sigframe_fdpic (_Unwind_State state,
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226 _Unwind_Control_Block *ucbp,
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227 _Unwind_Context *context)
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228 {
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229 unsigned int sp;
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230 unsigned int pc;
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231 unsigned int funcdesc;
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232 unsigned int handler;
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233 unsigned int first_handler_instruction;
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234 int i;
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235
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236 _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &sp);
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237 _Unwind_VRS_Get (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32, &pc);
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238
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239 funcdesc = *(unsigned int *)((pc & ~1) + FDPIC_FUNCDESC_OFFSET);
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240 handler = *(unsigned int *)(funcdesc);
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241 first_handler_instruction = *(unsigned int *)(handler & ~1);
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242
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243 /* Adjust SP to point to the start of registers according to
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244 signal type. */
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245 if (first_handler_instruction == ARM_SET_R7_RT_SIGRETURN
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246 || first_handler_instruction == THUMB2_SET_R7_RT_SIGRETURN)
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247 sp += ARM_NEW_RT_SIGFRAME_UCONTEXT
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248 + ARM_UCONTEXT_SIGCONTEXT
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249 + ARM_SIGCONTEXT_R0;
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250 else
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251 sp += ARM_UCONTEXT_SIGCONTEXT
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252 + ARM_SIGCONTEXT_R0;
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253 /* Restore regs saved on stack by the kernel. */
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254 for (i = 0; i < 16; i++)
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255 _Unwind_VRS_Set (context, _UVRSC_CORE, i, _UVRSD_UINT32, sp + 4 * i);
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256
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257 return _URC_CONTINUE_UNWIND;
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258 }
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259 #endif
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260
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111
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261 /* Find the exception index table eintry for the given address.
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262 Fill in the relevant fields of the UCB.
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263 Returns _URC_FAILURE if an error occurred, _URC_OK on success. */
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264
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265 static _Unwind_Reason_Code
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266 get_eit_entry (_Unwind_Control_Block *ucbp, _uw return_address)
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267 {
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268 const __EIT_entry * eitp;
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269 int nrec;
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270
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271 /* The return address is the address of the instruction following the
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272 call instruction (plus one in thumb mode). If this was the last
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273 instruction in the function the address will lie in the following
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274 function. Subtract 2 from the address so that it points within the call
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275 instruction itself. */
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276 return_address -= 2;
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277
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278 if (__gnu_Unwind_Find_exidx)
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279 {
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280 eitp = (const __EIT_entry *) __gnu_Unwind_Find_exidx (return_address,
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281 &nrec);
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282 if (!eitp)
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283 {
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145
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284 #if __FDPIC__
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285 /* If we are unwinding a signal handler then perhaps we have
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286 reached a trampoline. Try to detect jump to restorer
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287 sequence. */
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288 _uw *pc = (_uw *)((return_address+2) & ~1);
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289 if ((pc[0] == FDPIC_LDR_R12_WITH_FUNCDESC
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290 && pc[1] == FDPIC_LDR_R9_WITH_GOT
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291 && pc[2] == FDPIC_LDR_PC_WITH_RESTORER)
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292 || (pc[0] == FDPIC_T2_LDR_R12_WITH_FUNCDESC
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293 && pc[1] == FDPIC_T2_LDR_R9_WITH_GOT
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294 && pc[2] == FDPIC_T2_LDR_PC_WITH_RESTORER))
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295 {
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296 struct funcdesc_t *funcdesc
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297 = (struct funcdesc_t *) &__gnu_personality_sigframe_fdpic;
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298
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299 UCB_PR_ADDR (ucbp) = funcdesc->ptr;
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300 UCB_PR_GOT (ucbp) = funcdesc->got;
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301
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302 return _URC_OK;
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303 }
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304 #endif
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111
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305 UCB_PR_ADDR (ucbp) = 0;
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306 return _URC_FAILURE;
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307 }
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308 }
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309 else
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310 {
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311 eitp = &__exidx_start;
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312 nrec = &__exidx_end - &__exidx_start;
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313 }
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314
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315 eitp = search_EIT_table (eitp, nrec, return_address);
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316
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317 if (!eitp)
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318 {
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145
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319 #if __FDPIC__
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320 /* If we are unwinding a signal handler then perhaps we have
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321 reached a trampoline. Try to detect jump to restorer
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322 sequence. */
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323 _uw *pc = (_uw *)((return_address+2) & ~1);
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324 if ((pc[0] == FDPIC_LDR_R12_WITH_FUNCDESC
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325 && pc[1] == FDPIC_LDR_R9_WITH_GOT
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326 && pc[2] == FDPIC_LDR_PC_WITH_RESTORER)
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327 || (pc[0] == FDPIC_T2_LDR_R12_WITH_FUNCDESC
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328 && pc[1] == FDPIC_T2_LDR_R9_WITH_GOT
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329 && pc[2] == FDPIC_T2_LDR_PC_WITH_RESTORER))
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330 {
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331 struct funcdesc_t *funcdesc
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332 = (struct funcdesc_t *) &__gnu_personality_sigframe_fdpic;
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333
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334 UCB_PR_ADDR (ucbp) = funcdesc->ptr;
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335 UCB_PR_GOT (ucbp) = funcdesc->got;
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336
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337 return _URC_OK;
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338 }
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339 #endif
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111
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340 UCB_PR_ADDR (ucbp) = 0;
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341 return _URC_FAILURE;
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342 }
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343 ucbp->pr_cache.fnstart = selfrel_offset31 (&eitp->fnoffset);
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344
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345 /* Can this frame be unwound at all? */
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346 if (eitp->content == EXIDX_CANTUNWIND)
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347 {
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145
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348 #if __FDPIC__
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349 /* If we are unwinding a signal handler then perhaps we have
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350 reached a trampoline. Try to detect jump to restorer
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351 sequence. */
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352 _uw *pc = (_uw *)((return_address+2) & ~1);
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353 if ((pc[0] == FDPIC_LDR_R12_WITH_FUNCDESC
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354 && pc[1] == FDPIC_LDR_R9_WITH_GOT
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355 && pc[2] == FDPIC_LDR_PC_WITH_RESTORER)
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356 || (pc[0] == FDPIC_T2_LDR_R12_WITH_FUNCDESC
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357 && pc[1] == FDPIC_T2_LDR_R9_WITH_GOT
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358 && pc[2] == FDPIC_T2_LDR_PC_WITH_RESTORER))
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359 {
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360 struct funcdesc_t *funcdesc
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361 = (struct funcdesc_t *) &__gnu_personality_sigframe_fdpic;
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362
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363 UCB_PR_ADDR (ucbp) = funcdesc->ptr;
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364 UCB_PR_GOT (ucbp) = funcdesc->got;
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365
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366 return _URC_OK;
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367 }
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368 #endif
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111
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369 UCB_PR_ADDR (ucbp) = 0;
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370 return _URC_END_OF_STACK;
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371 }
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372
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373 /* Obtain the address of the "real" __EHT_Header word. */
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374
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375 if (eitp->content & uint32_highbit)
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376 {
|
|
|
377 /* It is immediate data. */
|
|
|
378 ucbp->pr_cache.ehtp = (_Unwind_EHT_Header *)&eitp->content;
|
|
|
379 ucbp->pr_cache.additional = 1;
|
|
|
380 }
|
|
|
381 else
|
|
|
382 {
|
|
|
383 /* The low 31 bits of the content field are a self-relative
|
|
|
384 offset to an _Unwind_EHT_Entry structure. */
|
|
|
385 ucbp->pr_cache.ehtp =
|
|
|
386 (_Unwind_EHT_Header *) selfrel_offset31 (&eitp->content);
|
|
|
387 ucbp->pr_cache.additional = 0;
|
|
|
388 }
|
|
|
389
|
|
|
390 /* Discover the personality routine address. */
|
|
|
391 if (*ucbp->pr_cache.ehtp & (1u << 31))
|
|
|
392 {
|
|
|
393 /* One of the predefined standard routines. */
|
|
|
394 _uw idx = (*(_uw *) ucbp->pr_cache.ehtp >> 24) & 0xf;
|
|
145
|
395 #if __FDPIC__
|
|
|
396 {
|
|
|
397 struct funcdesc_t *funcdesc
|
|
|
398 = (struct funcdesc_t *) __gnu_unwind_get_pr_addr (idx);
|
|
|
399 if (funcdesc)
|
|
|
400 {
|
|
|
401 UCB_PR_ADDR (ucbp) = funcdesc->ptr;
|
|
|
402 UCB_PR_GOT (ucbp) = funcdesc->got;
|
|
|
403 }
|
|
|
404 else
|
|
|
405 UCB_PR_ADDR (ucbp) = 0;
|
|
|
406 }
|
|
|
407 #else
|
|
111
|
408 UCB_PR_ADDR (ucbp) = __gnu_unwind_get_pr_addr (idx);
|
|
145
|
409 #endif
|
|
111
|
410 if (UCB_PR_ADDR (ucbp) == 0)
|
|
|
411 {
|
|
|
412 /* Failed */
|
|
|
413 return _URC_FAILURE;
|
|
|
414 }
|
|
|
415 }
|
|
|
416 else
|
|
|
417 {
|
|
|
418 /* Execute region offset to PR */
|
|
|
419 UCB_PR_ADDR (ucbp) = selfrel_offset31 (ucbp->pr_cache.ehtp);
|
|
145
|
420 #if __FDPIC__
|
|
|
421 UCB_PR_GOT (ucbp)
|
|
|
422 = (unsigned int) _Unwind_gnu_Find_got ((_Unwind_Ptr) UCB_PR_ADDR (ucbp));
|
|
|
423 #endif
|
|
111
|
424 }
|
|
|
425 return _URC_OK;
|
|
|
426 }
|
|
|
427
|
|
|
428
|
|
|
429 /* Perform phase2 unwinding. VRS is the initial virtual register state. */
|
|
|
430
|
|
|
431 static void __attribute__((noreturn))
|
|
|
432 unwind_phase2 (_Unwind_Control_Block * ucbp, phase2_vrs * vrs)
|
|
|
433 {
|
|
|
434 _Unwind_Reason_Code pr_result;
|
|
|
435
|
|
|
436 do
|
|
|
437 {
|
|
|
438 /* Find the entry for this routine. */
|
|
|
439 if (get_eit_entry (ucbp, VRS_PC(vrs)) != _URC_OK)
|
|
|
440 abort ();
|
|
|
441
|
|
|
442 UCB_SAVED_CALLSITE_ADDR (ucbp) = VRS_PC(vrs);
|
|
|
443
|
|
|
444 /* Call the pr to decide what to do. */
|
|
145
|
445 #if __FDPIC__
|
|
|
446 {
|
|
|
447 volatile struct funcdesc_t funcdesc;
|
|
|
448 funcdesc.ptr = UCB_PR_ADDR (ucbp);
|
|
|
449 funcdesc.got = UCB_PR_GOT (ucbp);
|
|
|
450 pr_result = ((personality_routine) &funcdesc)
|
|
|
451 (_US_UNWIND_FRAME_STARTING, ucbp, (_Unwind_Context *) vrs);
|
|
|
452 }
|
|
|
453 #else
|
|
111
|
454 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
455 (_US_UNWIND_FRAME_STARTING, ucbp, (_Unwind_Context *) vrs);
|
|
145
|
456 #endif
|
|
111
|
457 }
|
|
|
458 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
459
|
|
|
460 if (pr_result != _URC_INSTALL_CONTEXT)
|
|
|
461 abort();
|
|
|
462
|
|
145
|
463 #if __FDPIC__
|
|
|
464 /* r9 could have been lost due to PLT jump. Restore correct value. */
|
|
|
465 vrs->core.r[FDPIC_REGNUM] = _Unwind_gnu_Find_got (VRS_PC (vrs));
|
|
|
466 #endif
|
|
|
467
|
|
111
|
468 uw_restore_core_regs (vrs, &vrs->core);
|
|
|
469 }
|
|
|
470
|
|
|
471 /* Perform phase2 forced unwinding. */
|
|
|
472
|
|
|
473 static _Unwind_Reason_Code
|
|
|
474 unwind_phase2_forced (_Unwind_Control_Block *ucbp, phase2_vrs *entry_vrs,
|
|
|
475 int resuming)
|
|
|
476 {
|
|
|
477 _Unwind_Stop_Fn stop_fn = (_Unwind_Stop_Fn) UCB_FORCED_STOP_FN (ucbp);
|
|
|
478 void *stop_arg = (void *)UCB_FORCED_STOP_ARG (ucbp);
|
|
|
479 _Unwind_Reason_Code pr_result = 0;
|
|
|
480 /* We use phase1_vrs here even though we do not demand save, for the
|
|
|
481 prev_sp field. */
|
|
|
482 phase1_vrs saved_vrs, next_vrs;
|
|
|
483
|
|
|
484 /* Save the core registers. */
|
|
|
485 saved_vrs.core = entry_vrs->core;
|
|
|
486 /* We don't need to demand-save the non-core registers, because we
|
|
|
487 unwind in a single pass. */
|
|
|
488 saved_vrs.demand_save_flags = 0;
|
|
|
489
|
|
|
490 /* Unwind until we reach a propagation barrier. */
|
|
|
491 do
|
|
|
492 {
|
|
|
493 _Unwind_State action;
|
|
|
494 _Unwind_Reason_Code entry_code;
|
|
|
495 _Unwind_Reason_Code stop_code;
|
|
|
496
|
|
|
497 /* Find the entry for this routine. */
|
|
|
498 entry_code = get_eit_entry (ucbp, VRS_PC (&saved_vrs));
|
|
|
499
|
|
|
500 if (resuming)
|
|
|
501 {
|
|
|
502 action = _US_UNWIND_FRAME_RESUME | _US_FORCE_UNWIND;
|
|
|
503 resuming = 0;
|
|
|
504 }
|
|
|
505 else
|
|
|
506 action = _US_UNWIND_FRAME_STARTING | _US_FORCE_UNWIND;
|
|
|
507
|
|
|
508 if (entry_code == _URC_OK)
|
|
|
509 {
|
|
|
510 UCB_SAVED_CALLSITE_ADDR (ucbp) = VRS_PC (&saved_vrs);
|
|
|
511
|
|
|
512 next_vrs = saved_vrs;
|
|
|
513
|
|
|
514 /* Call the pr to decide what to do. */
|
|
145
|
515 #if __FDPIC__
|
|
|
516 {
|
|
|
517 volatile struct funcdesc_t funcdesc;
|
|
|
518 funcdesc.ptr = UCB_PR_ADDR (ucbp);
|
|
|
519 funcdesc.got = UCB_PR_GOT (ucbp);
|
|
|
520 pr_result = ((personality_routine) &funcdesc)
|
|
|
521 (action, ucbp, (void *) &next_vrs);
|
|
|
522 }
|
|
|
523 #else
|
|
111
|
524 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
525 (action, ucbp, (void *) &next_vrs);
|
|
145
|
526 #endif
|
|
111
|
527
|
|
|
528 saved_vrs.prev_sp = VRS_SP (&next_vrs);
|
|
|
529 }
|
|
|
530 else
|
|
|
531 {
|
|
|
532 /* Treat any failure as the end of unwinding, to cope more
|
|
|
533 gracefully with missing EH information. Mixed EH and
|
|
|
534 non-EH within one object will usually result in failure,
|
|
|
535 because the .ARM.exidx tables do not indicate the end
|
|
|
536 of the code to which they apply; but mixed EH and non-EH
|
|
|
537 shared objects should return an unwind failure at the
|
|
|
538 entry of a non-EH shared object. */
|
|
|
539 action |= _US_END_OF_STACK;
|
|
|
540
|
|
|
541 saved_vrs.prev_sp = VRS_SP (&saved_vrs);
|
|
|
542 }
|
|
|
543
|
|
|
544 stop_code = stop_fn (1, action, ucbp->exception_class, ucbp,
|
|
|
545 (void *)&saved_vrs, stop_arg);
|
|
|
546 if (stop_code != _URC_NO_REASON)
|
|
|
547 return _URC_FAILURE;
|
|
|
548
|
|
|
549 if (entry_code != _URC_OK)
|
|
|
550 return entry_code;
|
|
|
551
|
|
|
552 saved_vrs = next_vrs;
|
|
|
553 }
|
|
|
554 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
555
|
|
|
556 if (pr_result != _URC_INSTALL_CONTEXT)
|
|
|
557 {
|
|
|
558 /* Some sort of failure has occurred in the pr and probably the
|
|
|
559 pr returned _URC_FAILURE. */
|
|
|
560 return _URC_FAILURE;
|
|
|
561 }
|
|
|
562
|
|
145
|
563 #if __FDPIC__
|
|
|
564 /* r9 could have been lost due to PLT jump. Restore correct value. */
|
|
|
565 saved_vrs.core.r[FDPIC_REGNUM] = _Unwind_gnu_Find_got (VRS_PC (&saved_vrs));
|
|
|
566 #endif
|
|
|
567
|
|
111
|
568 uw_restore_core_regs (&saved_vrs, &saved_vrs.core);
|
|
|
569 }
|
|
|
570
|
|
|
571 /* This is a very limited implementation of _Unwind_GetCFA. It returns
|
|
|
572 the stack pointer as it is about to be unwound, and is only valid
|
|
|
573 while calling the stop function during forced unwinding. If the
|
|
|
574 current personality routine result is going to run a cleanup, this
|
|
|
575 will not be the CFA; but when the frame is really unwound, it will
|
|
|
576 be. */
|
|
|
577
|
|
|
578 _Unwind_Word
|
|
|
579 _Unwind_GetCFA (_Unwind_Context *context)
|
|
|
580 {
|
|
|
581 return ((phase1_vrs *) context)->prev_sp;
|
|
|
582 }
|
|
|
583
|
|
|
584 /* Perform phase1 unwinding. UCBP is the exception being thrown, and
|
|
|
585 entry_VRS is the register state on entry to _Unwind_RaiseException. */
|
|
|
586
|
|
|
587 _Unwind_Reason_Code
|
|
|
588 __gnu_Unwind_RaiseException (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
589
|
|
|
590 _Unwind_Reason_Code
|
|
|
591 __gnu_Unwind_RaiseException (_Unwind_Control_Block * ucbp,
|
|
|
592 phase2_vrs * entry_vrs)
|
|
|
593 {
|
|
|
594 phase1_vrs saved_vrs;
|
|
|
595 _Unwind_Reason_Code pr_result;
|
|
|
596
|
|
|
597 /* Set the pc to the call site. */
|
|
|
598 VRS_PC (entry_vrs) = VRS_RETURN(entry_vrs);
|
|
|
599
|
|
|
600 /* Save the core registers. */
|
|
|
601 saved_vrs.core = entry_vrs->core;
|
|
|
602 /* Set demand-save flags. */
|
|
|
603 saved_vrs.demand_save_flags = ~(_uw) 0;
|
|
|
604
|
|
|
605 /* Unwind until we reach a propagation barrier. */
|
|
|
606 do
|
|
|
607 {
|
|
|
608 /* Find the entry for this routine. */
|
|
|
609 if (get_eit_entry (ucbp, VRS_PC (&saved_vrs)) != _URC_OK)
|
|
|
610 return _URC_FAILURE;
|
|
|
611
|
|
|
612 /* Call the pr to decide what to do. */
|
|
145
|
613 #if __FDPIC__
|
|
|
614 {
|
|
|
615 volatile struct funcdesc_t funcdesc;
|
|
|
616 funcdesc.ptr = UCB_PR_ADDR (ucbp);
|
|
|
617 funcdesc.got = UCB_PR_GOT (ucbp);
|
|
|
618 pr_result = ((personality_routine) &funcdesc)
|
|
|
619 (_US_VIRTUAL_UNWIND_FRAME, ucbp, (void *) &saved_vrs);
|
|
|
620 }
|
|
|
621 #else
|
|
111
|
622 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
623 (_US_VIRTUAL_UNWIND_FRAME, ucbp, (void *) &saved_vrs);
|
|
145
|
624 #endif
|
|
111
|
625 }
|
|
|
626 while (pr_result == _URC_CONTINUE_UNWIND);
|
|
|
627
|
|
|
628 /* We've unwound as far as we want to go, so restore the original
|
|
|
629 register state. */
|
|
|
630 restore_non_core_regs (&saved_vrs);
|
|
|
631 if (pr_result != _URC_HANDLER_FOUND)
|
|
|
632 {
|
|
|
633 /* Some sort of failure has occurred in the pr and probably the
|
|
|
634 pr returned _URC_FAILURE. */
|
|
|
635 return _URC_FAILURE;
|
|
|
636 }
|
|
|
637
|
|
|
638 unwind_phase2 (ucbp, entry_vrs);
|
|
|
639 }
|
|
|
640
|
|
|
641 /* Resume unwinding after a cleanup has been run. UCBP is the exception
|
|
|
642 being thrown and ENTRY_VRS is the register state on entry to
|
|
|
643 _Unwind_Resume. */
|
|
|
644 _Unwind_Reason_Code
|
|
|
645 __gnu_Unwind_ForcedUnwind (_Unwind_Control_Block *,
|
|
|
646 _Unwind_Stop_Fn, void *, phase2_vrs *);
|
|
|
647
|
|
|
648 _Unwind_Reason_Code
|
|
|
649 __gnu_Unwind_ForcedUnwind (_Unwind_Control_Block *ucbp,
|
|
|
650 _Unwind_Stop_Fn stop_fn, void *stop_arg,
|
|
|
651 phase2_vrs *entry_vrs)
|
|
|
652 {
|
|
|
653 UCB_FORCED_STOP_FN (ucbp) = (_uw) stop_fn;
|
|
|
654 UCB_FORCED_STOP_ARG (ucbp) = (_uw) stop_arg;
|
|
|
655
|
|
|
656 /* Set the pc to the call site. */
|
|
|
657 VRS_PC (entry_vrs) = VRS_RETURN(entry_vrs);
|
|
|
658
|
|
|
659 return unwind_phase2_forced (ucbp, entry_vrs, 0);
|
|
|
660 }
|
|
|
661
|
|
|
662 _Unwind_Reason_Code
|
|
|
663 __gnu_Unwind_Resume (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
664
|
|
|
665 _Unwind_Reason_Code
|
|
|
666 __gnu_Unwind_Resume (_Unwind_Control_Block * ucbp, phase2_vrs * entry_vrs)
|
|
|
667 {
|
|
|
668 _Unwind_Reason_Code pr_result;
|
|
|
669
|
|
|
670 /* Recover the saved address. */
|
|
|
671 VRS_PC (entry_vrs) = UCB_SAVED_CALLSITE_ADDR (ucbp);
|
|
|
672
|
|
|
673 if (UCB_FORCED_STOP_FN (ucbp))
|
|
|
674 {
|
|
|
675 unwind_phase2_forced (ucbp, entry_vrs, 1);
|
|
|
676
|
|
|
677 /* We can't return failure at this point. */
|
|
|
678 abort ();
|
|
|
679 }
|
|
|
680
|
|
|
681 /* Call the cached PR. */
|
|
145
|
682 #if __FDPIC__
|
|
|
683 {
|
|
|
684 volatile struct funcdesc_t funcdesc;
|
|
|
685 funcdesc.ptr = UCB_PR_ADDR (ucbp);
|
|
|
686 funcdesc.got = UCB_PR_GOT (ucbp);
|
|
|
687 pr_result = ((personality_routine) &funcdesc)
|
|
|
688 (_US_UNWIND_FRAME_RESUME, ucbp, (_Unwind_Context *) entry_vrs);
|
|
|
689 }
|
|
|
690 #else
|
|
111
|
691 pr_result = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
692 (_US_UNWIND_FRAME_RESUME, ucbp, (_Unwind_Context *) entry_vrs);
|
|
145
|
693 #endif
|
|
111
|
694
|
|
|
695 switch (pr_result)
|
|
|
696 {
|
|
|
697 case _URC_INSTALL_CONTEXT:
|
|
|
698 /* Upload the registers to enter the landing pad. */
|
|
145
|
699 #if __FDPIC__
|
|
|
700 /* r9 could have been lost due to PLT jump. Restore correct value. */
|
|
|
701 entry_vrs->core.r[FDPIC_REGNUM] = _Unwind_gnu_Find_got (VRS_PC (entry_vrs));
|
|
|
702 #endif
|
|
111
|
703 uw_restore_core_regs (entry_vrs, &entry_vrs->core);
|
|
|
704
|
|
|
705 case _URC_CONTINUE_UNWIND:
|
|
|
706 /* Continue unwinding the next frame. */
|
|
|
707 unwind_phase2 (ucbp, entry_vrs);
|
|
|
708
|
|
|
709 default:
|
|
|
710 abort ();
|
|
|
711 }
|
|
|
712 }
|
|
|
713
|
|
|
714 _Unwind_Reason_Code
|
|
|
715 __gnu_Unwind_Resume_or_Rethrow (_Unwind_Control_Block *, phase2_vrs *);
|
|
|
716
|
|
|
717 _Unwind_Reason_Code
|
|
|
718 __gnu_Unwind_Resume_or_Rethrow (_Unwind_Control_Block * ucbp,
|
|
|
719 phase2_vrs * entry_vrs)
|
|
|
720 {
|
|
|
721 if (!UCB_FORCED_STOP_FN (ucbp))
|
|
|
722 return __gnu_Unwind_RaiseException (ucbp, entry_vrs);
|
|
|
723
|
|
|
724 /* Set the pc to the call site. */
|
|
|
725 VRS_PC (entry_vrs) = VRS_RETURN (entry_vrs);
|
|
|
726 /* Continue unwinding the next frame. */
|
|
|
727 return unwind_phase2_forced (ucbp, entry_vrs, 0);
|
|
|
728 }
|
|
|
729
|
|
|
730 /* Clean up an exception object when unwinding is complete. */
|
|
|
731 void
|
|
|
732 _Unwind_Complete (_Unwind_Control_Block * ucbp __attribute__((unused)))
|
|
|
733 {
|
|
|
734 }
|
|
|
735
|
|
|
736
|
|
|
737 /* Free an exception. */
|
|
|
738
|
|
|
739 void
|
|
|
740 _Unwind_DeleteException (_Unwind_Exception * exc)
|
|
|
741 {
|
|
|
742 if (exc->exception_cleanup)
|
|
|
743 (*exc->exception_cleanup) (_URC_FOREIGN_EXCEPTION_CAUGHT, exc);
|
|
|
744 }
|
|
|
745
|
|
|
746
|
|
|
747 /* Perform stack backtrace through unwind data. */
|
|
|
748 _Unwind_Reason_Code
|
|
|
749 __gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
|
|
|
750 phase2_vrs * entry_vrs);
|
|
|
751 _Unwind_Reason_Code
|
|
|
752 __gnu_Unwind_Backtrace(_Unwind_Trace_Fn trace, void * trace_argument,
|
|
|
753 phase2_vrs * entry_vrs)
|
|
|
754 {
|
|
|
755 phase1_vrs saved_vrs;
|
|
|
756 _Unwind_Reason_Code code;
|
|
|
757
|
|
|
758 _Unwind_Control_Block ucb;
|
|
|
759 _Unwind_Control_Block *ucbp = &ucb;
|
|
|
760
|
|
|
761 /* Set the pc to the call site. */
|
|
|
762 VRS_PC (entry_vrs) = VRS_RETURN (entry_vrs);
|
|
|
763
|
|
|
764 /* Save the core registers. */
|
|
|
765 saved_vrs.core = entry_vrs->core;
|
|
|
766 /* Set demand-save flags. */
|
|
|
767 saved_vrs.demand_save_flags = ~(_uw) 0;
|
|
|
768
|
|
|
769 do
|
|
|
770 {
|
|
|
771 /* Find the entry for this routine. */
|
|
|
772 if (get_eit_entry (ucbp, VRS_PC (&saved_vrs)) != _URC_OK)
|
|
|
773 {
|
|
|
774 code = _URC_FAILURE;
|
|
|
775 break;
|
|
|
776 }
|
|
|
777
|
|
|
778 /* The dwarf unwinder assumes the context structure holds things
|
|
|
779 like the function and LSDA pointers. The ARM implementation
|
|
|
780 caches these in the exception header (UCB). To avoid
|
|
|
781 rewriting everything we make the virtual IP register point at
|
|
|
782 the UCB. */
|
|
|
783 _Unwind_SetGR((_Unwind_Context *)&saved_vrs, UNWIND_POINTER_REG, (_Unwind_Ptr) ucbp);
|
|
|
784
|
|
|
785 /* Call trace function. */
|
|
|
786 if ((*trace) ((_Unwind_Context *) &saved_vrs, trace_argument)
|
|
|
787 != _URC_NO_REASON)
|
|
|
788 {
|
|
|
789 code = _URC_FAILURE;
|
|
|
790 break;
|
|
|
791 }
|
|
|
792
|
|
|
793 /* Call the pr to decide what to do. */
|
|
145
|
794 #if __FDPIC__
|
|
|
795 {
|
|
|
796 volatile struct funcdesc_t funcdesc;
|
|
|
797 funcdesc.ptr = UCB_PR_ADDR (ucbp);
|
|
|
798 funcdesc.got = UCB_PR_GOT (ucbp);
|
|
|
799 code = ((personality_routine) &funcdesc)
|
|
|
800 (_US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND,
|
|
|
801 ucbp, (void *) &saved_vrs);
|
|
|
802 }
|
|
|
803 #else
|
|
111
|
804 code = ((personality_routine) UCB_PR_ADDR (ucbp))
|
|
|
805 (_US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND,
|
|
|
806 ucbp, (void *) &saved_vrs);
|
|
145
|
807 #endif
|
|
111
|
808 }
|
|
|
809 while (code != _URC_END_OF_STACK
|
|
|
810 && code != _URC_FAILURE);
|
|
|
811
|
|
|
812 restore_non_core_regs (&saved_vrs);
|
|
|
813 return code;
|
|
|
814 }
|
|
|
815
|
|
|
816
|
|
|
817 /* Common implementation for ARM ABI defined personality routines.
|
|
|
818 ID is the index of the personality routine, other arguments are as defined
|
|
|
819 by __aeabi_unwind_cpp_pr{0,1,2}. */
|
|
|
820
|
|
|
821 static _Unwind_Reason_Code
|
|
|
822 __gnu_unwind_pr_common (_Unwind_State state,
|
|
|
823 _Unwind_Control_Block *ucbp,
|
|
|
824 _Unwind_Context *context,
|
|
|
825 int id)
|
|
|
826 {
|
|
|
827 __gnu_unwind_state uws;
|
|
|
828 _uw *data;
|
|
|
829 _uw offset;
|
|
|
830 _uw len;
|
|
|
831 _uw rtti_count;
|
|
|
832 int phase2_call_unexpected_after_unwind = 0;
|
|
|
833 int in_range = 0;
|
|
|
834 int forced_unwind = state & _US_FORCE_UNWIND;
|
|
|
835
|
|
|
836 state &= _US_ACTION_MASK;
|
|
|
837
|
|
|
838 data = (_uw *) ucbp->pr_cache.ehtp;
|
|
|
839 uws.data = *(data++);
|
|
|
840 uws.next = data;
|
|
|
841 if (id == 0)
|
|
|
842 {
|
|
|
843 uws.data <<= 8;
|
|
|
844 uws.words_left = 0;
|
|
|
845 uws.bytes_left = 3;
|
|
|
846 }
|
|
|
847 else if (id < 3)
|
|
|
848 {
|
|
|
849 uws.words_left = (uws.data >> 16) & 0xff;
|
|
|
850 uws.data <<= 16;
|
|
|
851 uws.bytes_left = 2;
|
|
|
852 data += uws.words_left;
|
|
|
853 }
|
|
|
854
|
|
|
855 /* Restore the saved pointer. */
|
|
|
856 if (state == _US_UNWIND_FRAME_RESUME)
|
|
|
857 data = (_uw *) ucbp->cleanup_cache.bitpattern[0];
|
|
|
858
|
|
|
859 if ((ucbp->pr_cache.additional & 1) == 0)
|
|
|
860 {
|
|
|
861 /* Process descriptors. */
|
|
|
862 while (*data)
|
|
|
863 {
|
|
|
864 _uw addr;
|
|
|
865 _uw fnstart;
|
|
|
866
|
|
|
867 if (id == 2)
|
|
|
868 {
|
|
|
869 len = ((EHT32 *) data)->length;
|
|
|
870 offset = ((EHT32 *) data)->offset;
|
|
|
871 data += 2;
|
|
|
872 }
|
|
|
873 else
|
|
|
874 {
|
|
|
875 len = ((EHT16 *) data)->length;
|
|
|
876 offset = ((EHT16 *) data)->offset;
|
|
|
877 data++;
|
|
|
878 }
|
|
|
879
|
|
|
880 fnstart = ucbp->pr_cache.fnstart + (offset & ~1);
|
|
|
881 addr = _Unwind_GetGR (context, R_PC);
|
|
|
882 in_range = (fnstart <= addr && addr < fnstart + (len & ~1));
|
|
|
883
|
|
|
884 switch (((offset & 1) << 1) | (len & 1))
|
|
|
885 {
|
|
|
886 case 0:
|
|
|
887 /* Cleanup. */
|
|
|
888 if (state != _US_VIRTUAL_UNWIND_FRAME
|
|
|
889 && in_range)
|
|
|
890 {
|
|
|
891 /* Cleanup in range, and we are running cleanups. */
|
|
|
892 _uw lp;
|
|
|
893
|
|
|
894 /* Landing pad address is 31-bit pc-relative offset. */
|
|
|
895 lp = selfrel_offset31 (data);
|
|
|
896 data++;
|
|
|
897 /* Save the exception data pointer. */
|
|
|
898 ucbp->cleanup_cache.bitpattern[0] = (_uw) data;
|
|
|
899 if (!__cxa_begin_cleanup (ucbp))
|
|
|
900 return _URC_FAILURE;
|
|
|
901 /* Setup the VRS to enter the landing pad. */
|
|
|
902 _Unwind_SetGR (context, R_PC, lp);
|
|
|
903 return _URC_INSTALL_CONTEXT;
|
|
|
904 }
|
|
|
905 /* Cleanup not in range, or we are in stage 1. */
|
|
|
906 data++;
|
|
|
907 break;
|
|
|
908
|
|
|
909 case 1:
|
|
|
910 /* Catch handler. */
|
|
|
911 if (state == _US_VIRTUAL_UNWIND_FRAME)
|
|
|
912 {
|
|
|
913 if (in_range)
|
|
|
914 {
|
|
|
915 /* Check for a barrier. */
|
|
|
916 _uw rtti;
|
|
|
917 bool is_reference = (data[0] & uint32_highbit) != 0;
|
|
|
918 void *matched;
|
|
|
919 enum __cxa_type_match_result match_type;
|
|
|
920
|
|
|
921 /* Check for no-throw areas. */
|
|
|
922 if (data[1] == (_uw) -2)
|
|
|
923 return _URC_FAILURE;
|
|
|
924
|
|
|
925 /* The thrown object immediately follows the ECB. */
|
|
|
926 matched = (void *)(ucbp + 1);
|
|
|
927 if (data[1] != (_uw) -1)
|
|
|
928 {
|
|
|
929 /* Match a catch specification. */
|
|
|
930 rtti = _Unwind_decode_typeinfo_ptr (0,
|
|
|
931 (_uw) &data[1]);
|
|
|
932 match_type = __cxa_type_match (ucbp,
|
|
|
933 (type_info *) rtti,
|
|
|
934 is_reference,
|
|
|
935 &matched);
|
|
|
936 }
|
|
|
937 else
|
|
|
938 match_type = ctm_succeeded;
|
|
|
939
|
|
|
940 if (match_type)
|
|
|
941 {
|
|
|
942 ucbp->barrier_cache.sp =
|
|
|
943 _Unwind_GetGR (context, R_SP);
|
|
|
944 // ctm_succeeded_with_ptr_to_base really
|
|
|
945 // means _c_t_m indirected the pointer
|
|
|
946 // object. We have to reconstruct the
|
|
|
947 // additional pointer layer by using a temporary.
|
|
|
948 if (match_type == ctm_succeeded_with_ptr_to_base)
|
|
|
949 {
|
|
|
950 ucbp->barrier_cache.bitpattern[2]
|
|
|
951 = (_uw) matched;
|
|
|
952 ucbp->barrier_cache.bitpattern[0]
|
|
|
953 = (_uw) &ucbp->barrier_cache.bitpattern[2];
|
|
|
954 }
|
|
|
955 else
|
|
|
956 ucbp->barrier_cache.bitpattern[0] = (_uw) matched;
|
|
|
957 ucbp->barrier_cache.bitpattern[1] = (_uw) data;
|
|
|
958 return _URC_HANDLER_FOUND;
|
|
|
959 }
|
|
|
960 }
|
|
|
961 /* Handler out of range, or not matched. */
|
|
|
962 }
|
|
|
963 else if (ucbp->barrier_cache.sp == _Unwind_GetGR (context, R_SP)
|
|
|
964 && ucbp->barrier_cache.bitpattern[1] == (_uw) data)
|
|
|
965 {
|
|
|
966 /* Matched a previous propagation barrier. */
|
|
|
967 _uw lp;
|
|
|
968
|
|
|
969 /* Setup for entry to the handler. */
|
|
|
970 lp = selfrel_offset31 (data);
|
|
|
971 _Unwind_SetGR (context, R_PC, lp);
|
|
|
972 _Unwind_SetGR (context, 0, (_uw) ucbp);
|
|
|
973 return _URC_INSTALL_CONTEXT;
|
|
|
974 }
|
|
|
975 /* Catch handler not matched. Advance to the next descriptor. */
|
|
|
976 data += 2;
|
|
|
977 break;
|
|
|
978
|
|
|
979 case 2:
|
|
|
980 rtti_count = data[0] & 0x7fffffff;
|
|
|
981 /* Exception specification. */
|
|
|
982 if (state == _US_VIRTUAL_UNWIND_FRAME)
|
|
|
983 {
|
|
|
984 if (in_range && (!forced_unwind || !rtti_count))
|
|
|
985 {
|
|
|
986 /* Match against the exception specification. */
|
|
|
987 _uw i;
|
|
|
988 _uw rtti;
|
|
|
989 void *matched;
|
|
|
990
|
|
|
991 for (i = 0; i < rtti_count; i++)
|
|
|
992 {
|
|
|
993 matched = (void *)(ucbp + 1);
|
|
|
994 rtti = _Unwind_decode_typeinfo_ptr (0,
|
|
|
995 (_uw) &data[i + 1]);
|
|
|
996 if (__cxa_type_match (ucbp, (type_info *) rtti, 0,
|
|
|
997 &matched))
|
|
|
998 break;
|
|
|
999 }
|
|
|
1000
|
|
|
1001 if (i == rtti_count)
|
|
|
1002 {
|
|
|
1003 /* Exception does not match the spec. */
|
|
|
1004 ucbp->barrier_cache.sp =
|
|
|
1005 _Unwind_GetGR (context, R_SP);
|
|
|
1006 ucbp->barrier_cache.bitpattern[0] = (_uw) matched;
|
|
|
1007 ucbp->barrier_cache.bitpattern[1] = (_uw) data;
|
|
|
1008 return _URC_HANDLER_FOUND;
|
|
|
1009 }
|
|
|
1010 }
|
|
|
1011 /* Handler out of range, or exception is permitted. */
|
|
|
1012 }
|
|
|
1013 else if (ucbp->barrier_cache.sp == _Unwind_GetGR (context, R_SP)
|
|
|
1014 && ucbp->barrier_cache.bitpattern[1] == (_uw) data)
|
|
|
1015 {
|
|
|
1016 /* Matched a previous propagation barrier. */
|
|
|
1017 _uw lp;
|
|
|
1018 /* Record the RTTI list for __cxa_call_unexpected. */
|
|
|
1019 ucbp->barrier_cache.bitpattern[1] = rtti_count;
|
|
|
1020 ucbp->barrier_cache.bitpattern[2] = 0;
|
|
|
1021 ucbp->barrier_cache.bitpattern[3] = 4;
|
|
|
1022 ucbp->barrier_cache.bitpattern[4] = (_uw) &data[1];
|
|
|
1023
|
|
|
1024 if (data[0] & uint32_highbit)
|
|
|
1025 {
|
|
|
1026 data += rtti_count + 1;
|
|
|
1027 /* Setup for entry to the handler. */
|
|
|
1028 lp = selfrel_offset31 (data);
|
|
|
1029 data++;
|
|
|
1030 _Unwind_SetGR (context, R_PC, lp);
|
|
|
1031 _Unwind_SetGR (context, 0, (_uw) ucbp);
|
|
|
1032 return _URC_INSTALL_CONTEXT;
|
|
|
1033 }
|
|
|
1034 else
|
|
|
1035 phase2_call_unexpected_after_unwind = 1;
|
|
|
1036 }
|
|
|
1037 if (data[0] & uint32_highbit)
|
|
|
1038 data++;
|
|
|
1039 data += rtti_count + 1;
|
|
|
1040 break;
|
|
|
1041
|
|
|
1042 default:
|
|
|
1043 /* Should never happen. */
|
|
|
1044 return _URC_FAILURE;
|
|
|
1045 }
|
|
|
1046 /* Finished processing this descriptor. */
|
|
|
1047 }
|
|
|
1048 }
|
|
|
1049
|
|
|
1050 if (id >= 3)
|
|
|
1051 {
|
|
|
1052 /* 24-bit ecoding */
|
|
|
1053 if (__gnu_unwind_24bit (context, uws.data, id == 4) != _URC_OK)
|
|
|
1054 return _URC_FAILURE;
|
|
|
1055 }
|
|
|
1056 else
|
|
|
1057 {
|
|
|
1058 if (__gnu_unwind_execute (context, &uws) != _URC_OK)
|
|
|
1059 return _URC_FAILURE;
|
|
|
1060 }
|
|
|
1061
|
|
|
1062 if (phase2_call_unexpected_after_unwind)
|
|
|
1063 {
|
|
|
1064 /* Enter __cxa_unexpected as if called from the call site. */
|
|
|
1065 _Unwind_SetGR (context, R_LR, _Unwind_GetGR (context, R_PC));
|
|
|
1066 _Unwind_SetGR (context, R_PC, (_uw) &__cxa_call_unexpected);
|
|
|
1067 return _URC_INSTALL_CONTEXT;
|
|
|
1068 }
|
|
|
1069
|
|
|
1070 return _URC_CONTINUE_UNWIND;
|
|
|
1071 }
|
