1 /* Header file for the ARM EABI unwinder
2 Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
3 Contributed by Paul Brook
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
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
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.
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. */
29 /* Language-independent unwinder header public defines. This contains both
30 ABI defined objects, and GNU support routines. */
35 #define __ARM_EABI_UNWINDER__ 1
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__)));
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 */
63 _US_VIRTUAL_UNWIND_FRAME = 0,
64 _US_UNWIND_FRAME_STARTING = 1,
65 _US_UNWIND_FRAME_RESUME = 2,
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
81 typedef struct _Unwind_Control_Block _Unwind_Control_Block;
82 typedef struct _Unwind_Context _Unwind_Context;
83 typedef _uw _Unwind_EHT_Header;
88 struct _Unwind_Control_Block
90 char exception_class[8];
91 void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
92 /* Unwinder cache, private fields for the unwinder's use */
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 */
102 /* Propagation barrier cache (valid after phase 1): */
109 /* Cleanup cache (preserved over cleanup): */
115 /* Pr cache (for pr's benefit): */
118 _uw fnstart; /* function start address */
119 _Unwind_EHT_Header *ehtp; /* pointer to EHT entry header word */
120 _uw additional; /* additional data */
124 long long int :0; /* Force alignment to 8-byte boundary */
127 /* Virtual Register Set*/
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 */
137 _Unwind_VRS_RegClass;
148 _Unwind_VRS_DataRepresentation;
153 _UVRSR_NOT_IMPLEMENTED = 1,
158 /* Frame unwinding state. */
161 /* The current word (bytes packed msb first). */
163 /* Pointer to the next word of data. */
165 /* The number of bytes left in this word. */
167 /* The number of words pointed to by ptr. */
172 typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
173 _Unwind_Control_Block *, _Unwind_Context *);
175 _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
176 _uw, _Unwind_VRS_DataRepresentation,
179 _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
180 _uw, _Unwind_VRS_DataRepresentation,
183 _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
184 _uw, _Unwind_VRS_DataRepresentation);
187 /* Support functions for the PR. */
188 #define _Unwind_Exception _Unwind_Control_Block
189 typedef char _Unwind_Exception_Class[8];
191 void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
192 _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
194 /* These two should never be used. */
195 _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
196 _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
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);
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, void*);
214 _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
215 void _Unwind_Complete(_Unwind_Control_Block *ucbp);
216 void _Unwind_DeleteException (_Unwind_Exception *);
218 _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
220 _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
221 __gnu_unwind_state *);
223 /* Decode an R_ARM_TARGET2 relocation. */
224 static inline _Unwind_Word
225 _Unwind_decode_target2 (_Unwind_Word ptr)
229 tmp = *(_Unwind_Word *) ptr;
230 /* Zero values are always NULL. */
234 #if defined(linux) || defined(__NetBSD__)
235 /* Pc-relative indirect. */
237 tmp = *(_Unwind_Word *) tmp;
238 #elif defined(__symbian__)
239 /* Absolute pointer. Nothing more to do. */
241 /* Pc-relative pointer. */
247 static inline _Unwind_Word
248 _Unwind_GetGR (_Unwind_Context *context, int regno)
251 _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
255 /* Return the address of the instruction, not the actual IP value. */
256 #define _Unwind_GetIP(context) \
257 (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
259 #define _Unwind_GetIPInfo(context, ip_before_insn) \
260 (*ip_before_insn = 0, _Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
263 _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
265 _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
268 /* The dwarf unwinder doesn't understand arm/thumb state. We assume the
269 landing pad uses the same instruction set as the call site. */
270 #define _Unwind_SetIP(context, val) \
271 _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
277 #endif /* defined UNWIND_ARM_H */