1 //===--------------------- Unwind_AppleExtras.cpp -------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //
9 //===----------------------------------------------------------------------===//
10
11 #include "config.h"
12 #include "AddressSpace.hpp"
13 #include "DwarfParser.hpp"
14 #include "unwind_ext.h"
15
16
17 // private keymgr stuff
18 #define KEYMGR_GCC3_DW2_OBJ_LIST 302
19 extern "C" {
20 extern void _keymgr_set_and_unlock_processwide_ptr(int key, void *ptr);
21 extern void *_keymgr_get_and_lock_processwide_ptr(int key);
22 }
23
24 // undocumented libgcc "struct object"
25 struct libgcc_object {
26 void *start;
27 void *unused1;
28 void *unused2;
29 void *fde;
30 unsigned long encoding;
31 void *fde_end;
32 libgcc_object *next;
33 };
34
35 // undocumented libgcc "struct km_object_info" referenced by
36 // KEYMGR_GCC3_DW2_OBJ_LIST
37 struct libgcc_object_info {
38 libgcc_object *seen_objects;
39 libgcc_object *unseen_objects;
40 unsigned spare[2];
41 };
42
43
44 // static linker symbols to prevent wrong two level namespace for _Unwind symbols
45 #if defined(__arm__)
46 #define NOT_HERE_BEFORE_5_0(sym) \
47 extern const char sym##_tmp30 __asm("$ld$hide$os3.0$_" #sym ); \
48 __attribute__((visibility("default"))) const char sym##_tmp30 = 0; \
49 extern const char sym##_tmp31 __asm("$ld$hide$os3.1$_" #sym ); \
50 __attribute__((visibility("default"))) const char sym##_tmp31 = 0; \
51 extern const char sym##_tmp32 __asm("$ld$hide$os3.2$_" #sym );\
52 __attribute__((visibility("default"))) const char sym##_tmp32 = 0; \
53 extern const char sym##_tmp40 __asm("$ld$hide$os4.0$_" #sym ); \
54 __attribute__((visibility("default"))) const char sym##_tmp40 = 0; \
55 extern const char sym##_tmp41 __asm("$ld$hide$os4.1$_" #sym ); \
56 __attribute__((visibility("default"))) const char sym##_tmp41 = 0; \
57 extern const char sym##_tmp42 __asm("$ld$hide$os4.2$_" #sym ); \
58 __attribute__((visibility("default"))) const char sym##_tmp42 = 0; \
59 extern const char sym##_tmp43 __asm("$ld$hide$os4.3$_" #sym ); \
60 __attribute__((visibility("default"))) const char sym##_tmp43 = 0;
61 #elif defined(__arm64__)
62 #define NOT_HERE_BEFORE_10_6(sym)
63 #define NEVER_HERE(sym)
64 #else
65 #define NOT_HERE_BEFORE_10_6(sym) \
66 extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
67 __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
68 extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
69 __attribute__((visibility("default"))) const char sym##_tmp5 = 0;
70 #define NEVER_HERE(sym) \
71 extern const char sym##_tmp4 __asm("$ld$hide$os10.4$_" #sym ); \
72 __attribute__((visibility("default"))) const char sym##_tmp4 = 0; \
73 extern const char sym##_tmp5 __asm("$ld$hide$os10.5$_" #sym ); \
74 __attribute__((visibility("default"))) const char sym##_tmp5 = 0; \
75 extern const char sym##_tmp6 __asm("$ld$hide$os10.6$_" #sym ); \
76 __attribute__((visibility("default"))) const char sym##_tmp6 = 0;
77 #endif
78
79
80 #if defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)
81
82 //
83 // symbols in libSystem.dylib in 10.6 and later, but are in libgcc_s.dylib in
84 // earlier versions
85 //
86 NOT_HERE_BEFORE_10_6(_Unwind_DeleteException)
87 NOT_HERE_BEFORE_10_6(_Unwind_Find_FDE)
88 NOT_HERE_BEFORE_10_6(_Unwind_ForcedUnwind)
89 NOT_HERE_BEFORE_10_6(_Unwind_GetGR)
90 NOT_HERE_BEFORE_10_6(_Unwind_GetIP)
91 NOT_HERE_BEFORE_10_6(_Unwind_GetLanguageSpecificData)
92 NOT_HERE_BEFORE_10_6(_Unwind_GetRegionStart)
93 NOT_HERE_BEFORE_10_6(_Unwind_RaiseException)
94 NOT_HERE_BEFORE_10_6(_Unwind_Resume)
95 NOT_HERE_BEFORE_10_6(_Unwind_SetGR)
96 NOT_HERE_BEFORE_10_6(_Unwind_SetIP)
97 NOT_HERE_BEFORE_10_6(_Unwind_Backtrace)
98 NOT_HERE_BEFORE_10_6(_Unwind_FindEnclosingFunction)
99 NOT_HERE_BEFORE_10_6(_Unwind_GetCFA)
100 NOT_HERE_BEFORE_10_6(_Unwind_GetDataRelBase)
101 NOT_HERE_BEFORE_10_6(_Unwind_GetTextRelBase)
102 NOT_HERE_BEFORE_10_6(_Unwind_Resume_or_Rethrow)
103 NOT_HERE_BEFORE_10_6(_Unwind_GetIPInfo)
104 NOT_HERE_BEFORE_10_6(__register_frame)
105 NOT_HERE_BEFORE_10_6(__deregister_frame)
106
107 //
108 // symbols in libSystem.dylib for compatibility, but we don't want any new code
109 // using them
110 //
111 NEVER_HERE(__register_frame_info_bases)
112 NEVER_HERE(__register_frame_info)
113 NEVER_HERE(__register_frame_info_table_bases)
114 NEVER_HERE(__register_frame_info_table)
115 NEVER_HERE(__register_frame_table)
116 NEVER_HERE(__deregister_frame_info)
117 NEVER_HERE(__deregister_frame_info_bases)
118
119 #endif // defined(_LIBUNWIND_BUILD_ZERO_COST_APIS)
120
121
122
123
124 #if defined(_LIBUNWIND_BUILD_SJLJ_APIS)
125 //
126 // symbols in libSystem.dylib in iOS 5.0 and later, but are in libgcc_s.dylib in
127 // earlier versions
128 //
129 NOT_HERE_BEFORE_5_0(_Unwind_GetLanguageSpecificData)
130 NOT_HERE_BEFORE_5_0(_Unwind_GetRegionStart)
131 NOT_HERE_BEFORE_5_0(_Unwind_GetIP)
132 NOT_HERE_BEFORE_5_0(_Unwind_SetGR)
133 NOT_HERE_BEFORE_5_0(_Unwind_SetIP)
134 NOT_HERE_BEFORE_5_0(_Unwind_DeleteException)
135 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Register)
136 NOT_HERE_BEFORE_5_0(_Unwind_GetGR)
137 NOT_HERE_BEFORE_5_0(_Unwind_GetIPInfo)
138 NOT_HERE_BEFORE_5_0(_Unwind_GetCFA)
139 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume)
140 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_RaiseException)
141 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Resume_or_Rethrow)
142 NOT_HERE_BEFORE_5_0(_Unwind_SjLj_Unregister)
143
144 #endif // defined(_LIBUNWIND_BUILD_SJLJ_APIS)
145
146
147 namespace libunwind {
148
149 _LIBUNWIND_HIDDEN
checkKeyMgrRegisteredFDEs(uintptr_t pc,void * & fde)150 bool checkKeyMgrRegisteredFDEs(uintptr_t pc, void *&fde) {
151 #if __MAC_OS_X_VERSION_MIN_REQUIRED
152 // lastly check for old style keymgr registration of dynamically generated
153 // FDEs acquire exclusive access to libgcc_object_info
154 libgcc_object_info *head = (libgcc_object_info *)
155 _keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
156 if (head != NULL) {
157 // look at each FDE in keymgr
158 for (libgcc_object *ob = head->unseen_objects; ob != NULL; ob = ob->next) {
159 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
160 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
161 const char *msg = CFI_Parser<LocalAddressSpace>::decodeFDE(
162 LocalAddressSpace::sThisAddressSpace,
163 (uintptr_t)ob->fde, &fdeInfo, &cieInfo);
164 if (msg == NULL) {
165 // Check if this FDE is for a function that includes the pc
166 if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
167 fde = (void*)fdeInfo.pcStart;
168 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
169 head);
170 return true;
171 }
172 }
173 }
174 }
175 // release libgcc_object_info
176 _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, head);
177 #else
178 (void)pc;
179 (void)fde;
180 #endif
181 return false;
182 }
183
184 }
185
186
187 #if !defined(FOR_DYLD) && defined(_LIBUNWIND_BUILD_SJLJ_APIS)
188
189 #ifndef _LIBUNWIND_HAS_NO_THREADS
190 #include <System/pthread_machdep.h>
191 #else
192 _Unwind_FunctionContext *fc_ = nullptr;
193 #endif
194
195 // Accessors to get get/set linked list of frames for sjlj based execeptions.
196 _LIBUNWIND_HIDDEN
__Unwind_SjLj_GetTopOfFunctionStack()197 struct _Unwind_FunctionContext *__Unwind_SjLj_GetTopOfFunctionStack() {
198 #ifndef _LIBUNWIND_HAS_NO_THREADS
199 return (struct _Unwind_FunctionContext *)
200 _pthread_getspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key);
201 #else
202 return fc_;
203 #endif
204 }
205
206 _LIBUNWIND_HIDDEN
__Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext * fc)207 void __Unwind_SjLj_SetTopOfFunctionStack(struct _Unwind_FunctionContext *fc) {
208 #ifndef _LIBUNWIND_HAS_NO_THREADS
209 _pthread_setspecific_direct(__PTK_LIBC_DYLD_Unwind_SjLj_Key, fc);
210 #else
211 fc_ = fc;
212 #endif
213 }
214 #endif
215