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| 1 | /* Header file for the ARM EABI unwinder |
|---|---|
| 2 | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is free software; you can redistribute it and/or modify it |
| 5 | under the terms of the GNU General Public License as published by the |
| 6 | Free Software Foundation; either version 2, or (at your option) any |
| 7 | later version. |
| 8 | |
| 9 | In addition to the permissions in the GNU General Public License, the |
| 10 | Free Software Foundation gives you unlimited permission to link the |
| 11 | compiled version of this file into combinations with other programs, |
| 12 | and to distribute those combinations without any restriction coming |
| 13 | from the use of this file. (The General Public License restrictions |
| 14 | do apply in other respects; for example, they cover modification of |
| 15 | the file, and distribution when not linked into a combine |
| 16 | executable.) |
| 17 | |
| 18 | This file is distributed in the hope that it will be useful, but |
| 19 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with this program. If not, see |
| 25 | <https://www.gnu.org/licenses/>. */ |
| 26 | |
| 27 | /* Language-independent unwinder header public defines. This contains both |
| 28 | ABI defined objects, and GNU support routines. */ |
| 29 | |
| 30 | #ifndef UNWIND_ARM_H |
| 31 | #define UNWIND_ARM_H |
| 32 | |
| 33 | #define __ARM_EABI_UNWINDER__ 1 |
| 34 | |
| 35 | #ifdef __cplusplus |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | typedef unsigned _Unwind_Word __attribute__((__mode__(__word__))); |
| 39 | typedef signed _Unwind_Sword __attribute__((__mode__(__word__))); |
| 40 | typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__))); |
| 41 | typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__))); |
| 42 | typedef _Unwind_Word _uw; |
| 43 | typedef unsigned _uw64 __attribute__((mode(__DI__))); |
| 44 | typedef unsigned _uw16 __attribute__((mode(__HI__))); |
| 45 | typedef unsigned _uw8 __attribute__((mode(__QI__))); |
| 46 | |
| 47 | typedef enum |
| 48 | { |
| 49 | _URC_OK = 0, /* operation completed successfully */ |
| 50 | _URC_FOREIGN_EXCEPTION_CAUGHT = 1, |
| 51 | _URC_END_OF_STACK = 5, |
| 52 | _URC_HANDLER_FOUND = 6, |
| 53 | _URC_INSTALL_CONTEXT = 7, |
| 54 | _URC_CONTINUE_UNWIND = 8, |
| 55 | _URC_FAILURE = 9 /* unspecified failure of some kind */ |
| 56 | } |
| 57 | _Unwind_Reason_Code; |
| 58 | |
| 59 | typedef enum |
| 60 | { |
| 61 | _US_VIRTUAL_UNWIND_FRAME = 0, |
| 62 | _US_UNWIND_FRAME_STARTING = 1, |
| 63 | _US_UNWIND_FRAME_RESUME = 2, |
| 64 | _US_ACTION_MASK = 3, |
| 65 | _US_FORCE_UNWIND = 8, |
| 66 | _US_END_OF_STACK = 16 |
| 67 | } |
| 68 | _Unwind_State; |
| 69 | |
| 70 | /* Provided only for for compatibility with existing code. */ |
| 71 | typedef int _Unwind_Action; |
| 72 | #define _UA_SEARCH_PHASE 1 |
| 73 | #define _UA_CLEANUP_PHASE 2 |
| 74 | #define _UA_HANDLER_FRAME 4 |
| 75 | #define _UA_FORCE_UNWIND 8 |
| 76 | #define _UA_END_OF_STACK 16 |
| 77 | #define _URC_NO_REASON _URC_OK |
| 78 | |
| 79 | typedef struct _Unwind_Control_Block _Unwind_Control_Block; |
| 80 | typedef struct _Unwind_Context _Unwind_Context; |
| 81 | typedef _uw _Unwind_EHT_Header; |
| 82 | |
| 83 | |
| 84 | /* UCB: */ |
| 85 | |
| 86 | struct _Unwind_Control_Block |
| 87 | { |
| 88 | #ifdef _LIBC |
| 89 | /* For the benefit of code which assumes this is a scalar. All |
| 90 | glibc ever does is clear it. */ |
| 91 | _uw64 exception_class; |
| 92 | #else |
| 93 | char exception_class[8]; |
| 94 | #endif |
| 95 | void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *); |
| 96 | /* Unwinder cache, private fields for the unwinder's use */ |
| 97 | struct |
| 98 | { |
| 99 | _uw reserved1; /* Forced unwind stop fn, 0 if not forced */ |
| 100 | _uw reserved2; /* Personality routine address */ |
| 101 | _uw reserved3; /* Saved callsite address */ |
| 102 | _uw reserved4; /* Forced unwind stop arg */ |
| 103 | _uw reserved5; |
| 104 | } |
| 105 | unwinder_cache; |
| 106 | /* Propagation barrier cache (valid after phase 1): */ |
| 107 | struct |
| 108 | { |
| 109 | _uw sp; |
| 110 | _uw bitpattern[5]; |
| 111 | } |
| 112 | barrier_cache; |
| 113 | /* Cleanup cache (preserved over cleanup): */ |
| 114 | struct |
| 115 | { |
| 116 | _uw bitpattern[4]; |
| 117 | } |
| 118 | cleanup_cache; |
| 119 | /* Pr cache (for pr's benefit): */ |
| 120 | struct |
| 121 | { |
| 122 | _uw fnstart; /* function start address */ |
| 123 | _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */ |
| 124 | _uw additional; /* additional data */ |
| 125 | _uw reserved1; |
| 126 | } |
| 127 | pr_cache; |
| 128 | long long int :0; /* Force alignment to 8-byte boundary */ |
| 129 | }; |
| 130 | |
| 131 | /* Virtual Register Set*/ |
| 132 | |
| 133 | typedef enum |
| 134 | { |
| 135 | _UVRSC_CORE = 0, /* integer register */ |
| 136 | _UVRSC_VFP = 1, /* vfp */ |
| 137 | _UVRSC_FPA = 2, /* fpa */ |
| 138 | _UVRSC_WMMXD = 3, /* Intel WMMX data register */ |
| 139 | _UVRSC_WMMXC = 4 /* Intel WMMX control register */ |
| 140 | } |
| 141 | _Unwind_VRS_RegClass; |
| 142 | |
| 143 | typedef enum |
| 144 | { |
| 145 | _UVRSD_UINT32 = 0, |
| 146 | _UVRSD_VFPX = 1, |
| 147 | _UVRSD_FPAX = 2, |
| 148 | _UVRSD_UINT64 = 3, |
| 149 | _UVRSD_FLOAT = 4, |
| 150 | _UVRSD_DOUBLE = 5 |
| 151 | } |
| 152 | _Unwind_VRS_DataRepresentation; |
| 153 | |
| 154 | typedef enum |
| 155 | { |
| 156 | _UVRSR_OK = 0, |
| 157 | _UVRSR_NOT_IMPLEMENTED = 1, |
| 158 | _UVRSR_FAILED = 2 |
| 159 | } |
| 160 | _Unwind_VRS_Result; |
| 161 | |
| 162 | /* Frame unwinding state. */ |
| 163 | typedef struct |
| 164 | { |
| 165 | /* The current word (bytes packed msb first). */ |
| 166 | _uw data; |
| 167 | /* Pointer to the next word of data. */ |
| 168 | _uw *next; |
| 169 | /* The number of bytes left in this word. */ |
| 170 | _uw8 bytes_left; |
| 171 | /* The number of words pointed to by ptr. */ |
| 172 | _uw8 words_left; |
| 173 | } |
| 174 | __gnu_unwind_state; |
| 175 | |
| 176 | typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State, |
| 177 | _Unwind_Control_Block *, _Unwind_Context *); |
| 178 | |
| 179 | _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass, |
| 180 | _uw, _Unwind_VRS_DataRepresentation, |
| 181 | void *); |
| 182 | |
| 183 | _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass, |
| 184 | _uw, _Unwind_VRS_DataRepresentation, |
| 185 | void *); |
| 186 | |
| 187 | _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass, |
| 188 | _uw, _Unwind_VRS_DataRepresentation); |
| 189 | |
| 190 | |
| 191 | /* Support functions for the PR. */ |
| 192 | #define _Unwind_Exception _Unwind_Control_Block |
| 193 | typedef char _Unwind_Exception_Class[8]; |
| 194 | |
| 195 | void * _Unwind_GetLanguageSpecificData (_Unwind_Context *); |
| 196 | _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *); |
| 197 | |
| 198 | /* These two should never be used. */ |
| 199 | _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *); |
| 200 | _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *); |
| 201 | |
| 202 | /* Interface functions: */ |
| 203 | _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp); |
| 204 | void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp); |
| 205 | _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp); |
| 206 | |
| 207 | typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn) |
| 208 | (int, _Unwind_Action, _Unwind_Exception_Class, |
| 209 | _Unwind_Control_Block *, struct _Unwind_Context *, void *); |
| 210 | _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *, |
| 211 | _Unwind_Stop_Fn, void *); |
| 212 | _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *); |
| 213 | void _Unwind_Complete(_Unwind_Control_Block *ucbp); |
| 214 | void _Unwind_DeleteException (_Unwind_Exception *); |
| 215 | |
| 216 | _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *, |
| 217 | _Unwind_Context *); |
| 218 | _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *, |
| 219 | __gnu_unwind_state *); |
| 220 | |
| 221 | /* Decode an R_ARM_TARGET2 relocation. */ |
| 222 | static inline _Unwind_Word |
| 223 | _Unwind_decode_target2 (_Unwind_Word ptr) |
| 224 | { |
| 225 | _Unwind_Word tmp; |
| 226 | |
| 227 | tmp = *(_Unwind_Word *) ptr; |
| 228 | /* Zero values are always NULL. */ |
| 229 | if (!tmp) |
| 230 | return 0; |
| 231 | |
| 232 | #if defined(linux) || defined(__NetBSD__) |
| 233 | /* Pc-relative indirect. */ |
| 234 | tmp += ptr; |
| 235 | tmp = *(_Unwind_Word *) tmp; |
| 236 | #elif defined(__symbian__) |
| 237 | /* Absolute pointer. Nothing more to do. */ |
| 238 | #else |
| 239 | /* Pc-relative pointer. */ |
| 240 | tmp += ptr; |
| 241 | #endif |
| 242 | return tmp; |
| 243 | } |
| 244 | |
| 245 | static inline _Unwind_Word |
| 246 | _Unwind_GetGR (_Unwind_Context *context, int regno) |
| 247 | { |
| 248 | _uw val; |
| 249 | _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val); |
| 250 | return val; |
| 251 | } |
| 252 | |
| 253 | /* Return the address of the instruction, not the actual IP value. */ |
| 254 | #define _Unwind_GetIP(context) \ |
| 255 | (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1) |
| 256 | |
| 257 | static inline void |
| 258 | _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val) |
| 259 | { |
| 260 | _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val); |
| 261 | } |
| 262 | |
| 263 | /* The dwarf unwinder doesn't understand arm/thumb state. We assume the |
| 264 | landing pad uses the same instruction set as the call site. */ |
| 265 | #define _Unwind_SetIP(context, val) \ |
| 266 | _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1)) |
| 267 | |
| 268 | typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) |
| 269 | (struct _Unwind_Context *, void *); |
| 270 | |
| 271 | extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *); |
| 272 | |
| 273 | #ifdef __cplusplus |
| 274 | } /* extern "C" */ |
| 275 | #endif |
| 276 | |
| 277 | #endif /* defined UNWIND_ARM_H */ |
| 278 |
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