1 /*===---- unwind.h - Stack unwinding ----------------------------------------=== 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to deal 5 * in the Software without restriction, including without limitation the rights 6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 * copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 19 * THE SOFTWARE. 20 * 21 *===-----------------------------------------------------------------------=== 22 */ 23 24 /* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/ 25 26 #ifndef __CLANG_UNWIND_H 27 #define __CLANG_UNWIND_H 28 29 #if __has_include_next(<unwind.h>) 30 /* Darwin and libunwind provide an unwind.h. If that's available, use 31 * it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE, 32 * so define that around the include.*/ 33 # ifndef _GNU_SOURCE 34 # define _SHOULD_UNDEFINE_GNU_SOURCE 35 # define _GNU_SOURCE 36 # endif 37 // libunwind's unwind.h reflects the current visibility. However, Mozilla 38 // builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the 39 // visibility to default and export its contents. gcc also allows users to 40 // override its override by #defining HIDE_EXPORTS (but note, this only obeys 41 // the user's -fvisibility setting; it doesn't hide any exports on its own). We 42 // imitate gcc's header here: 43 # ifdef HIDE_EXPORTS 44 # include_next <unwind.h> 45 # else 46 # pragma GCC visibility push(default) 47 # include_next <unwind.h> 48 # pragma GCC visibility pop 49 # endif 50 # ifdef _SHOULD_UNDEFINE_GNU_SOURCE 51 # undef _GNU_SOURCE 52 # undef _SHOULD_UNDEFINE_GNU_SOURCE 53 # endif 54 #else 55 56 #include <stdint.h> 57 58 #ifdef __cplusplus 59 extern "C" { 60 #endif 61 62 /* It is a bit strange for a header to play with the visibility of the 63 symbols it declares, but this matches gcc's behavior and some programs 64 depend on it */ 65 #ifndef HIDE_EXPORTS 66 #pragma GCC visibility push(default) 67 #endif 68 69 struct _Unwind_Context; 70 typedef struct _Unwind_Context _Unwind_Context; 71 typedef enum { 72 _URC_NO_REASON = 0, 73 _URC_FOREIGN_EXCEPTION_CAUGHT = 1, 74 75 _URC_FATAL_PHASE2_ERROR = 2, 76 _URC_FATAL_PHASE1_ERROR = 3, 77 _URC_NORMAL_STOP = 4, 78 79 _URC_END_OF_STACK = 5, 80 _URC_HANDLER_FOUND = 6, 81 _URC_INSTALL_CONTEXT = 7, 82 _URC_CONTINUE_UNWIND = 8 83 } _Unwind_Reason_Code; 84 85 86 #ifdef __arm__ 87 88 typedef enum { 89 _UVRSC_CORE = 0, /* integer register */ 90 _UVRSC_VFP = 1, /* vfp */ 91 _UVRSC_WMMXD = 3, /* Intel WMMX data register */ 92 _UVRSC_WMMXC = 4 /* Intel WMMX control register */ 93 } _Unwind_VRS_RegClass; 94 95 typedef enum { 96 _UVRSD_UINT32 = 0, 97 _UVRSD_VFPX = 1, 98 _UVRSD_UINT64 = 3, 99 _UVRSD_FLOAT = 4, 100 _UVRSD_DOUBLE = 5 101 } _Unwind_VRS_DataRepresentation; 102 103 typedef enum { 104 _UVRSR_OK = 0, 105 _UVRSR_NOT_IMPLEMENTED = 1, 106 _UVRSR_FAILED = 2 107 } _Unwind_VRS_Result; 108 109 _Unwind_VRS_Result _Unwind_VRS_Get(struct _Unwind_Context *__context, 110 _Unwind_VRS_RegClass __regclass, 111 uint32_t __regno, 112 _Unwind_VRS_DataRepresentation __representation, 113 void *__valuep); 114 115 static inline uintptr_t _Unwind_GetIP(struct _Unwind_Context *context) { 116 uintptr_t ip = 0; 117 _Unwind_VRS_Get(context, _UVRSC_CORE, 15, _UVRSD_UINT32, &ip); 118 ip &= ~(uintptr_t)0x1; /* remove thumb mode bit */ 119 return ip; 120 } 121 122 #else 123 124 uintptr_t _Unwind_GetIP(struct _Unwind_Context* __context); 125 126 #endif 127 128 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context*, void*); 129 _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void*); 130 131 #ifndef HIDE_EXPORTS 132 #pragma GCC visibility pop 133 #endif 134 135 #ifdef __cplusplus 136 } 137 #endif 138 139 #endif 140 141 #endif /* __CLANG_UNWIND_H */ 142
