1/* Header file for the ARM EABI unwinder
2 Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Paul Brook
4
5 This file is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
8 later version.
9
10 In addition to the permissions in the GNU General Public License, the
11 Free Software Foundation gives you unlimited permission to link the
12 compiled version of this file into combinations with other programs,
13 and to distribute those combinations without any restriction coming
14 from the use of this file. (The General Public License restrictions
15 do apply in other respects; for example, they cover modification of
16 the file, and distribution when not linked into a combine
17 executable.)
18
19 This file is distributed in the hope that it will be useful, but
20 WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 General Public License for more details.
23
24 You should have received a copy of the GNU General Public License
25 along with this program; see the file COPYING. If not, write to
26 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
27 Boston, MA 02110-1301, USA. */
28
29/* Language-independent unwinder header public defines. This contains both
30 ABI defined objects, and GNU support routines. */
31
32#ifndef UNWIND_ARM_H
33#define UNWIND_ARM_H
34
35#define __ARM_EABI_UNWINDER__ 1
36
37#ifdef __cplusplus
38extern "C" {
39#endif
40 typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
41 typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
42 typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
43 typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
44 typedef _Unwind_Word _uw;
45 typedef unsigned _uw64 __attribute__((mode(__DI__)));
46 typedef unsigned _uw16 __attribute__((mode(__HI__)));
47 typedef unsigned _uw8 __attribute__((mode(__QI__)));
48
49 typedef enum
50 {
51 _URC_OK = 0, /* operation completed successfully */
52 _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
53 _URC_END_OF_STACK = 5,
54 _URC_HANDLER_FOUND = 6,
55 _URC_INSTALL_CONTEXT = 7,
56 _URC_CONTINUE_UNWIND = 8,
57 _URC_FAILURE = 9 /* unspecified failure of some kind */
58 }
59 _Unwind_Reason_Code;
60
61 typedef enum
62 {
63 _US_VIRTUAL_UNWIND_FRAME = 0,
64 _US_UNWIND_FRAME_STARTING = 1,
65 _US_UNWIND_FRAME_RESUME = 2,
66 _US_ACTION_MASK = 3,
67 _US_FORCE_UNWIND = 8,
68 _US_END_OF_STACK = 16
69 }
70 _Unwind_State;
71
72 /* Provided only for for compatibility with existing code. */
73 typedef int _Unwind_Action;
74#define _UA_SEARCH_PHASE 1
75#define _UA_CLEANUP_PHASE 2
76#define _UA_HANDLER_FRAME 4
77#define _UA_FORCE_UNWIND 8
78#define _UA_END_OF_STACK 16
79#define _URC_NO_REASON _URC_OK
80
81 typedef struct _Unwind_Control_Block _Unwind_Control_Block;
82 typedef struct _Unwind_Context _Unwind_Context;
83 typedef _uw _Unwind_EHT_Header;
84
85
86 /* UCB: */
87
88 struct _Unwind_Control_Block
89 {
90 unsigned exception_class __attribute__((__mode__(__DI__)));
91 void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
92 /* Unwinder cache, private fields for the unwinder's use */
93 struct
94 {
95 _uw reserved1; /* Forced unwind stop fn, 0 if not forced */
96 _uw reserved2; /* Personality routine address */
97 _uw reserved3; /* Saved callsite address */
98 _uw reserved4; /* Forced unwind stop arg */
99 _uw reserved5;
100 }
101 unwinder_cache;
102 /* Propagation barrier cache (valid after phase 1): */
103 struct
104 {
105 _uw sp;
106 _uw bitpattern[5];
107 }
108 barrier_cache;
109 /* Cleanup cache (preserved over cleanup): */
110 struct
111 {
112 _uw bitpattern[4];
113 }
114 cleanup_cache;
115 /* Pr cache (for pr's benefit): */
116 struct
117 {
118 _uw fnstart; /* function start address */
119 _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */
120 _uw additional; /* additional data */
121 _uw reserved1;
122 }
123 pr_cache;
124 long long int :0; /* Force alignment to 8-byte boundary */
125 };
126
127 /* Virtual Register Set*/
128
129 typedef enum
130 {
131 _UVRSC_CORE = 0, /* integer register */
132 _UVRSC_VFP = 1, /* vfp */
133 _UVRSC_FPA = 2, /* fpa */
134 _UVRSC_WMMXD = 3, /* Intel WMMX data register */
135 _UVRSC_WMMXC = 4 /* Intel WMMX control register */
136 }
137 _Unwind_VRS_RegClass;
138
139 typedef enum
140 {
141 _UVRSD_UINT32 = 0,
142 _UVRSD_VFPX = 1,
143 _UVRSD_FPAX = 2,
144 _UVRSD_UINT64 = 3,
145 _UVRSD_FLOAT = 4,
146 _UVRSD_DOUBLE = 5
147 }
148 _Unwind_VRS_DataRepresentation;
149
150 typedef enum
151 {
152 _UVRSR_OK = 0,
153 _UVRSR_NOT_IMPLEMENTED = 1,
154 _UVRSR_FAILED = 2
155 }
156 _Unwind_VRS_Result;
157
158 /* Frame unwinding state. */
159 typedef struct
160 {
161 /* The current word (bytes packed msb first). */
162 _uw data;
163 /* Pointer to the next word of data. */
164 _uw *next;
165 /* The number of bytes left in this word. */
166 _uw8 bytes_left;
167 /* The number of words pointed to by ptr. */
168 _uw8 words_left;
169 }
170 __gnu_unwind_state;
171
172 typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
173 _Unwind_Control_Block *, _Unwind_Context *);
174
175 _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
176 _uw, _Unwind_VRS_DataRepresentation,
177 void *);
178
179 _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
180 _uw, _Unwind_VRS_DataRepresentation,
181 void *);
182
183 _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
184 _uw, _Unwind_VRS_DataRepresentation);
185
186
187 /* Support functions for the PR. */
188#define _Unwind_Exception _Unwind_Control_Block
189 typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
190
191 void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
192 _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
193
194 /* These two should never be used. */
195 _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
196 _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
197
198 /* Interface functions: */
199 _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);
200 void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);
201 _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);
202
203 typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
204 (int, _Unwind_Action, _Unwind_Exception_Class,
205 _Unwind_Control_Block *, struct _Unwind_Context *, void *);
206 _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
207 _Unwind_Stop_Fn, void *);
208 /* @@@ Use unwind data to perform a stack backtrace. The trace callback
209 is called for every stack frame in the call chain, but no cleanup
210 actions are performed. */
211 typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (_Unwind_Context *, void *);
212 _Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,
213 void*);
214
215 _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
216 void _Unwind_Complete(_Unwind_Control_Block *ucbp);
217 void _Unwind_DeleteException (_Unwind_Exception *);
218
219 _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
220 _Unwind_Context *);
221 _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
222 __gnu_unwind_state *);
223
224 /* Decode an R_ARM_TARGET2 relocation. */
225 static inline _Unwind_Word
226 _Unwind_decode_target2 (_Unwind_Word ptr)
227 {
228 _Unwind_Word tmp;
229
230 tmp = *(_Unwind_Word *) ptr;
231 /* Zero values are always NULL. */
232 if (!tmp)
233 return 0;
234
|
236 /* Pc-relative indirect. */
237 tmp += ptr;
238 tmp = *(_Unwind_Word *) tmp;
239#elif defined(__symbian__)
240 /* Absolute pointer. Nothing more to do. */
241#else
242 /* Pc-relative pointer. */
243 tmp += ptr;
244#endif
245 return tmp;
246 }
247
248 static inline _Unwind_Word
249 _Unwind_GetGR (_Unwind_Context *context, int regno)
250 {
251 _uw val;
252 _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
253 return val;
254 }
255
256#ifndef __FreeBSD__
257 /* Return the address of the instruction, not the actual IP value. */
258#define _Unwind_GetIP(context) \
259 (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
260
261#define _Unwind_GetIPInfo(context, ip_before_insn) \
262 (*ip_before_insn = 0, _Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
263#else
264 _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
265 _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
266#endif
267
268 static inline void
269 _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
270 {
271 _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
272 }
273
274 /* The dwarf unwinder doesn't understand arm/thumb state. We assume the
275 landing pad uses the same instruction set as the call site. */
276#define _Unwind_SetIP(context, val) \
277 _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
278
279#ifdef __cplusplus
280} /* extern "C" */
281#endif
282
283#endif /* defined UNWIND_ARM_H */
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