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1 /* Header file for the ARM EABI and C6X unwinders
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2 Copyright (C) 2003-2018 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 /* Language-independent unwinder header public defines. This contains both
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25 ABI defined objects, and GNU support routines. */
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26
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27 #ifndef UNWIND_ARM_COMMON_H
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28 #define UNWIND_ARM_COMMON_H
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29
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30 #define __ARM_EABI_UNWINDER__ 1
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31
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32 #ifdef __cplusplus
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33 extern "C" {
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34 #endif
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35 typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
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36 typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
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37 typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
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38 typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
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39 typedef _Unwind_Word _uw;
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40 typedef unsigned _uw64 __attribute__((mode(__DI__)));
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41 typedef unsigned _uw16 __attribute__((mode(__HI__)));
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42 typedef unsigned _uw8 __attribute__((mode(__QI__)));
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43
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44 typedef enum
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45 {
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46 _URC_OK = 0, /* operation completed successfully */
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47 _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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48 _URC_END_OF_STACK = 5,
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49 _URC_HANDLER_FOUND = 6,
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50 _URC_INSTALL_CONTEXT = 7,
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51 _URC_CONTINUE_UNWIND = 8,
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52 _URC_FAILURE = 9 /* unspecified failure of some kind */
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53 }
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54 _Unwind_Reason_Code;
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55
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56 typedef enum
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57 {
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58 _US_VIRTUAL_UNWIND_FRAME = 0,
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59 _US_UNWIND_FRAME_STARTING = 1,
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60 _US_UNWIND_FRAME_RESUME = 2,
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61 _US_ACTION_MASK = 3,
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62 _US_FORCE_UNWIND = 8,
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63 _US_END_OF_STACK = 16
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64 }
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65 _Unwind_State;
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66
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67 /* Provided only for compatibility with existing code. */
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68 typedef int _Unwind_Action;
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69 #define _UA_SEARCH_PHASE 1
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70 #define _UA_CLEANUP_PHASE 2
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71 #define _UA_HANDLER_FRAME 4
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72 #define _UA_FORCE_UNWIND 8
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73 #define _UA_END_OF_STACK 16
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74 #define _URC_NO_REASON _URC_OK
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75
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76 typedef struct _Unwind_Control_Block _Unwind_Control_Block;
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77 typedef struct _Unwind_Context _Unwind_Context;
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78 typedef _uw _Unwind_EHT_Header;
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79
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80
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81 /* UCB: */
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82
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83 struct _Unwind_Control_Block
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84 {
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85 char exception_class[8];
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86 void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
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87 /* Unwinder cache, private fields for the unwinder's use */
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88 struct
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89 {
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90 _uw reserved1; /* Forced unwind stop fn, 0 if not forced */
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91 _uw reserved2; /* Personality routine address */
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92 _uw reserved3; /* Saved callsite address */
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93 _uw reserved4; /* Forced unwind stop arg */
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94 _uw reserved5;
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95 }
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96 unwinder_cache;
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97 /* Propagation barrier cache (valid after phase 1): */
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98 struct
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99 {
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100 _uw sp;
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101 _uw bitpattern[5];
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102 }
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103 barrier_cache;
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104 /* Cleanup cache (preserved over cleanup): */
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105 struct
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106 {
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107 _uw bitpattern[4];
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108 }
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109 cleanup_cache;
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110 /* Pr cache (for pr's benefit): */
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111 struct
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112 {
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113 _uw fnstart; /* function start address */
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114 _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */
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115 _uw additional; /* additional data */
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116 _uw reserved1;
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117 }
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118 pr_cache;
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119 long long int :0; /* Force alignment to 8-byte boundary */
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120 };
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121
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122 /* Virtual Register Set*/
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123
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124 typedef enum
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125 {
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126 _UVRSC_CORE = 0, /* integer register */
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127 _UVRSC_VFP = 1, /* vfp */
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128 _UVRSC_FPA = 2, /* fpa */
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129 _UVRSC_WMMXD = 3, /* Intel WMMX data register */
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130 _UVRSC_WMMXC = 4 /* Intel WMMX control register */
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131 }
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132 _Unwind_VRS_RegClass;
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133
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134 typedef enum
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135 {
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136 _UVRSD_UINT32 = 0,
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137 _UVRSD_VFPX = 1,
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138 _UVRSD_FPAX = 2,
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139 _UVRSD_UINT64 = 3,
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140 _UVRSD_FLOAT = 4,
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141 _UVRSD_DOUBLE = 5
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142 }
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143 _Unwind_VRS_DataRepresentation;
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144
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145 typedef enum
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146 {
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147 _UVRSR_OK = 0,
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148 _UVRSR_NOT_IMPLEMENTED = 1,
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149 _UVRSR_FAILED = 2
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150 }
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151 _Unwind_VRS_Result;
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152
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153 /* Frame unwinding state. */
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154 typedef struct
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155 {
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156 /* The current word (bytes packed msb first). */
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157 _uw data;
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158 /* Pointer to the next word of data. */
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159 _uw *next;
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160 /* The number of bytes left in this word. */
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161 _uw8 bytes_left;
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162 /* The number of words pointed to by ptr. */
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163 _uw8 words_left;
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164 }
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165 __gnu_unwind_state;
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166
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167 typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
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168 _Unwind_Control_Block *, _Unwind_Context *);
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169
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170 _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
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171 _uw, _Unwind_VRS_DataRepresentation,
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172 void *);
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173
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174 _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
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175 _uw, _Unwind_VRS_DataRepresentation,
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176 void *);
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177
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178 _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
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179 _uw, _Unwind_VRS_DataRepresentation);
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180
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181
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182 /* Support functions for the PR. */
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183 #define _Unwind_Exception _Unwind_Control_Block
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184 typedef char _Unwind_Exception_Class[8];
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185
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186 void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
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187 _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
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188
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189 _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
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190 /* This should never be used. */
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191 _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
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192
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193 /* Interface functions: */
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194 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);
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195 void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);
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196 _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);
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197
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198 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
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199 (int, _Unwind_Action, _Unwind_Exception_Class,
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200 _Unwind_Control_Block *, struct _Unwind_Context *, void *);
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201 _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
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202 _Unwind_Stop_Fn, void *);
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203 /* @@@ Use unwind data to perform a stack backtrace. The trace callback
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204 is called for every stack frame in the call chain, but no cleanup
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205 actions are performed. */
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206 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (_Unwind_Context *, void *);
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207 _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,
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208 void*);
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209
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210 _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
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211 void _Unwind_Complete(_Unwind_Control_Block *ucbp);
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212 void _Unwind_DeleteException (_Unwind_Exception *);
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213
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214 _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
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215 _Unwind_Context *);
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216 _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
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217 __gnu_unwind_state *);
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218
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219 static inline _Unwind_Word
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220 _Unwind_GetGR (_Unwind_Context *context, int regno)
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221 {
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222 _uw val;
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223 _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
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224 return val;
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225 }
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226
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227 #define _Unwind_GetIPInfo(context, ip_before_insn) \
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228 (*ip_before_insn = 0, _Unwind_GetIP (context))
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229
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230 static inline void
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231 _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
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232 {
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233 _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
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234 }
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235
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236 _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
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237 void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
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238
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239 /* leb128 type numbers have a potentially unlimited size.
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240 The target of the following definitions of _sleb128_t and _uleb128_t
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241 is to have efficient data types large enough to hold the leb128 type
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242 numbers used in the unwind code. */
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243 typedef long _sleb128_t;
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244 typedef unsigned long _uleb128_t;
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245
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246 #ifdef __cplusplus
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247 } /* extern "C" */
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248 #endif
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249
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250 #endif /* defined UNWIND_ARM_COMMON_H */
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