1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2003, 2005 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5This file is part of libunwind.
6
7Permission is hereby granted, free of charge, to any person obtaining
8a copy of this software and associated documentation files (the
9"Software"), to deal in the Software without restriction, including
10without limitation the rights to use, copy, modify, merge, publish,
11distribute, sublicense, and/or sell copies of the Software, and to
12permit persons to whom the Software is furnished to do so, subject to
13the following conditions:
14
15The above copyright notice and this permission notice shall be
16included in all copies or substantial portions of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
25
26#ifndef unwind_internal_h
27#define unwind_internal_h
28
29#define UNW_LOCAL_ONLY
30
31#include <unwind.h>
32#include <stdlib.h>
33#include <libunwind.h>
34
35#include "libunwind_i.h"
36
37/* The version of the _Unwind_*() interface implemented by this code.  */
38#define _U_VERSION	1
39
40typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
41	(int, _Unwind_Action, uint64_t, struct _Unwind_Exception *,
42	 struct _Unwind_Context *);
43
44struct _Unwind_Context {
45  unw_cursor_t cursor;
46  int end_of_stack;	/* set to 1 if the end of stack was reached */
47};
48
49/* This must be a macro because unw_getcontext() must be invoked from
50   the callee, even if optimization (and hence inlining) is turned
51   off.  The macro arguments MUST NOT have any side-effects. */
52#define _Unwind_InitContext(context, uc)				     \
53  ((context)->end_of_stack = 0,						     \
54   ((unw_getcontext (uc) < 0 || unw_init_local (&(context)->cursor, uc) < 0) \
55    ? -1 : 0))
56
57static _Unwind_Reason_Code ALWAYS_INLINE
58_Unwind_Phase2 (struct _Unwind_Exception *exception_object,
59		struct _Unwind_Context *context,
60/* ANDROID support update. */
61		int *destroy_map)
62/* End of ANDROID update. */
63{
64  _Unwind_Stop_Fn stop = (_Unwind_Stop_Fn) exception_object->private_1;
65  uint64_t exception_class = exception_object->exception_class;
66  void *stop_parameter = (void *) exception_object->private_2;
67  _Unwind_Personality_Fn personality;
68  _Unwind_Reason_Code reason;
69  _Unwind_Action actions;
70  unw_proc_info_t pi;
71  unw_word_t ip;
72  int ret;
73
74  /* ANDROID support update. */
75  *destroy_map = 1;
76  /* End of ANDROID update. */
77
78  actions = _UA_CLEANUP_PHASE;
79  if (stop)
80    actions |= _UA_FORCE_UNWIND;
81
82  while (1)
83    {
84      ret = unw_step (&context->cursor);
85      if (ret <= 0)
86	{
87	   /* ANDROID support update. */
88	   /* Treat any stop as end of stack. */
89	   actions |= _UA_END_OF_STACK;
90	   context->end_of_stack = 1;
91	   /* End of ANDROID support. */
92	}
93
94      if (stop)
95	{
96	  /* ANDROID support update. */
97	  /* The stop function might not return, so free any local map. */
98	  unw_map_local_destroy ();
99	  /* End of ANDROID support. */
100	  reason = (*stop) (_U_VERSION, actions, exception_class,
101			    exception_object, context, stop_parameter);
102	  if (reason != _URC_NO_REASON)
103	    {
104	      /* Stop function may return _URC_FATAL_PHASE2_ERROR if
105	         it's unable to handle end-of-stack condition or
106	         _URC_FATAL_PHASE2_ERROR if something is wrong.  Not
107	         that it matters: the resulting state is indeterminate
108	         anyhow so we must return _URC_FATAL_PHASE2_ERROR... */
109	      *destroy_map = 0;
110	      return _URC_FATAL_PHASE2_ERROR;
111	    }
112	  /* ANDROID support update. */
113	  unw_map_local_create ();
114	  /* End of ANDROID support. */
115	}
116
117      if (context->end_of_stack
118	  || unw_get_proc_info (&context->cursor, &pi) < 0)
119	return _URC_FATAL_PHASE2_ERROR;
120
121      personality = (_Unwind_Personality_Fn) (uintptr_t) pi.handler;
122      if (personality)
123	{
124	  if (!stop)
125	    {
126	      if (unw_get_reg (&context->cursor, UNW_REG_IP, &ip) < 0)
127		return _URC_FATAL_PHASE2_ERROR;
128
129	      if ((unsigned long) stop_parameter == ip)
130		actions |= _UA_HANDLER_FRAME;
131	    }
132
133	  reason = (*personality) (_U_VERSION, actions, exception_class,
134				   exception_object, context);
135	  if (reason != _URC_CONTINUE_UNWIND)
136	    {
137	      if (reason == _URC_INSTALL_CONTEXT)
138		{
139		  /* we may regain control via _Unwind_Resume() */
140		  unw_resume (&context->cursor);
141		  abort ();
142		}
143	      else
144		return _URC_FATAL_PHASE2_ERROR;
145	    }
146	  if (actions & _UA_HANDLER_FRAME)
147	    /* The personality routine for the handler-frame changed
148	       it's mind; that's a no-no... */
149	    abort ();
150	}
151    }
152  return _URC_FATAL_PHASE2_ERROR;	/* shouldn't be reached */
153}
154
155#endif /* unwind_internal_h */
156