1 |
38 |
julius |
/* SJLJ exception handling and frame unwind runtime interface routines.
|
2 |
|
|
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006
|
3 |
|
|
Free Software Foundation, Inc.
|
4 |
|
|
|
5 |
|
|
This file is part of GCC.
|
6 |
|
|
|
7 |
|
|
GCC is free software; you can redistribute it and/or modify it
|
8 |
|
|
under the terms of the GNU General Public License as published by
|
9 |
|
|
the Free Software Foundation; either version 2, or (at your option)
|
10 |
|
|
any later version.
|
11 |
|
|
|
12 |
|
|
In addition to the permissions in the GNU General Public License, the
|
13 |
|
|
Free Software Foundation gives you unlimited permission to link the
|
14 |
|
|
compiled version of this file into combinations with other programs,
|
15 |
|
|
and to distribute those combinations without any restriction coming
|
16 |
|
|
from the use of this file. (The General Public License restrictions
|
17 |
|
|
do apply in other respects; for example, they cover modification of
|
18 |
|
|
the file, and distribution when not linked into a combined
|
19 |
|
|
executable.)
|
20 |
|
|
|
21 |
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT
|
22 |
|
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
23 |
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
|
24 |
|
|
License for more details.
|
25 |
|
|
|
26 |
|
|
You should have received a copy of the GNU General Public License
|
27 |
|
|
along with GCC; see the file COPYING. If not, write to the Free
|
28 |
|
|
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
|
29 |
|
|
02110-1301, USA. */
|
30 |
|
|
|
31 |
|
|
#include "tconfig.h"
|
32 |
|
|
#include "tsystem.h"
|
33 |
|
|
#include "coretypes.h"
|
34 |
|
|
#include "tm.h"
|
35 |
|
|
#include "unwind.h"
|
36 |
|
|
#include "gthr.h"
|
37 |
|
|
|
38 |
|
|
#ifdef __USING_SJLJ_EXCEPTIONS__
|
39 |
|
|
|
40 |
|
|
#ifdef DONT_USE_BUILTIN_SETJMP
|
41 |
|
|
#ifndef inhibit_libc
|
42 |
|
|
#include <setjmp.h>
|
43 |
|
|
#else
|
44 |
|
|
typedef void *jmp_buf[JMP_BUF_SIZE];
|
45 |
|
|
extern void longjmp(jmp_buf, int) __attribute__((noreturn));
|
46 |
|
|
#endif
|
47 |
|
|
#else
|
48 |
|
|
#define longjmp __builtin_longjmp
|
49 |
|
|
#endif
|
50 |
|
|
|
51 |
|
|
/* The setjmp side is dealt with in the except.c file. */
|
52 |
|
|
#undef setjmp
|
53 |
|
|
#define setjmp setjmp_should_not_be_used_in_this_file
|
54 |
|
|
|
55 |
|
|
|
56 |
|
|
/* This structure is allocated on the stack of the target function.
|
57 |
|
|
This must match the definition created in except.c:init_eh. */
|
58 |
|
|
struct SjLj_Function_Context
|
59 |
|
|
{
|
60 |
|
|
/* This is the chain through all registered contexts. It is
|
61 |
|
|
filled in by _Unwind_SjLj_Register. */
|
62 |
|
|
struct SjLj_Function_Context *prev;
|
63 |
|
|
|
64 |
|
|
/* This is assigned in by the target function before every call
|
65 |
|
|
to the index of the call site in the lsda. It is assigned by
|
66 |
|
|
the personality routine to the landing pad index. */
|
67 |
|
|
int call_site;
|
68 |
|
|
|
69 |
|
|
/* This is how data is returned from the personality routine to
|
70 |
|
|
the target function's handler. */
|
71 |
|
|
_Unwind_Word data[4];
|
72 |
|
|
|
73 |
|
|
/* These are filled in once by the target function before any
|
74 |
|
|
exceptions are expected to be handled. */
|
75 |
|
|
_Unwind_Personality_Fn personality;
|
76 |
|
|
void *lsda;
|
77 |
|
|
|
78 |
|
|
#ifdef DONT_USE_BUILTIN_SETJMP
|
79 |
|
|
/* We don't know what sort of alignment requirements the system
|
80 |
|
|
jmp_buf has. We over estimated in except.c, and now we have
|
81 |
|
|
to match that here just in case the system *didn't* have more
|
82 |
|
|
restrictive requirements. */
|
83 |
|
|
jmp_buf jbuf __attribute__((aligned));
|
84 |
|
|
#else
|
85 |
|
|
void *jbuf[];
|
86 |
|
|
#endif
|
87 |
|
|
};
|
88 |
|
|
|
89 |
|
|
struct _Unwind_Context
|
90 |
|
|
{
|
91 |
|
|
struct SjLj_Function_Context *fc;
|
92 |
|
|
};
|
93 |
|
|
|
94 |
|
|
typedef struct
|
95 |
|
|
{
|
96 |
|
|
_Unwind_Personality_Fn personality;
|
97 |
|
|
} _Unwind_FrameState;
|
98 |
|
|
|
99 |
|
|
|
100 |
|
|
/* Manage the chain of registered function contexts. */
|
101 |
|
|
|
102 |
|
|
/* Single threaded fallback chain. */
|
103 |
|
|
static struct SjLj_Function_Context *fc_static;
|
104 |
|
|
|
105 |
|
|
#if __GTHREADS
|
106 |
|
|
static __gthread_key_t fc_key;
|
107 |
|
|
static int use_fc_key = -1;
|
108 |
|
|
|
109 |
|
|
static void
|
110 |
|
|
fc_key_init (void)
|
111 |
|
|
{
|
112 |
|
|
use_fc_key = __gthread_key_create (&fc_key, 0) == 0;
|
113 |
|
|
}
|
114 |
|
|
|
115 |
|
|
static void
|
116 |
|
|
fc_key_init_once (void)
|
117 |
|
|
{
|
118 |
|
|
static __gthread_once_t once = __GTHREAD_ONCE_INIT;
|
119 |
|
|
if (__gthread_once (&once, fc_key_init) != 0 || use_fc_key < 0)
|
120 |
|
|
use_fc_key = 0;
|
121 |
|
|
}
|
122 |
|
|
#endif
|
123 |
|
|
|
124 |
|
|
void
|
125 |
|
|
_Unwind_SjLj_Register (struct SjLj_Function_Context *fc)
|
126 |
|
|
{
|
127 |
|
|
#if __GTHREADS
|
128 |
|
|
if (use_fc_key < 0)
|
129 |
|
|
fc_key_init_once ();
|
130 |
|
|
|
131 |
|
|
if (use_fc_key)
|
132 |
|
|
{
|
133 |
|
|
fc->prev = __gthread_getspecific (fc_key);
|
134 |
|
|
__gthread_setspecific (fc_key, fc);
|
135 |
|
|
}
|
136 |
|
|
else
|
137 |
|
|
#endif
|
138 |
|
|
{
|
139 |
|
|
fc->prev = fc_static;
|
140 |
|
|
fc_static = fc;
|
141 |
|
|
}
|
142 |
|
|
}
|
143 |
|
|
|
144 |
|
|
static inline struct SjLj_Function_Context *
|
145 |
|
|
_Unwind_SjLj_GetContext (void)
|
146 |
|
|
{
|
147 |
|
|
#if __GTHREADS
|
148 |
|
|
if (use_fc_key < 0)
|
149 |
|
|
fc_key_init_once ();
|
150 |
|
|
|
151 |
|
|
if (use_fc_key)
|
152 |
|
|
return __gthread_getspecific (fc_key);
|
153 |
|
|
#endif
|
154 |
|
|
return fc_static;
|
155 |
|
|
}
|
156 |
|
|
|
157 |
|
|
static inline void
|
158 |
|
|
_Unwind_SjLj_SetContext (struct SjLj_Function_Context *fc)
|
159 |
|
|
{
|
160 |
|
|
#if __GTHREADS
|
161 |
|
|
if (use_fc_key < 0)
|
162 |
|
|
fc_key_init_once ();
|
163 |
|
|
|
164 |
|
|
if (use_fc_key)
|
165 |
|
|
__gthread_setspecific (fc_key, fc);
|
166 |
|
|
else
|
167 |
|
|
#endif
|
168 |
|
|
fc_static = fc;
|
169 |
|
|
}
|
170 |
|
|
|
171 |
|
|
void
|
172 |
|
|
_Unwind_SjLj_Unregister (struct SjLj_Function_Context *fc)
|
173 |
|
|
{
|
174 |
|
|
_Unwind_SjLj_SetContext (fc->prev);
|
175 |
|
|
}
|
176 |
|
|
|
177 |
|
|
|
178 |
|
|
/* Get/set the return data value at INDEX in CONTEXT. */
|
179 |
|
|
|
180 |
|
|
_Unwind_Word
|
181 |
|
|
_Unwind_GetGR (struct _Unwind_Context *context, int index)
|
182 |
|
|
{
|
183 |
|
|
return context->fc->data[index];
|
184 |
|
|
}
|
185 |
|
|
|
186 |
|
|
/* Get the value of the CFA as saved in CONTEXT. */
|
187 |
|
|
|
188 |
|
|
_Unwind_Word
|
189 |
|
|
_Unwind_GetCFA (struct _Unwind_Context *context __attribute__((unused)))
|
190 |
|
|
{
|
191 |
|
|
/* ??? Ideally __builtin_setjmp places the CFA in the jmpbuf. */
|
192 |
|
|
|
193 |
|
|
#ifndef DONT_USE_BUILTIN_SETJMP
|
194 |
|
|
/* This is a crude imitation of the CFA: the saved stack pointer.
|
195 |
|
|
This is roughly the CFA of the frame before CONTEXT. When using the
|
196 |
|
|
DWARF-2 unwinder _Unwind_GetCFA returns the CFA of the frame described
|
197 |
|
|
by CONTEXT instead; but for DWARF-2 the cleanups associated with
|
198 |
|
|
CONTEXT have already been run, and for SJLJ they have not yet been. */
|
199 |
|
|
if (context->fc != NULL)
|
200 |
|
|
return (_Unwind_Word) context->fc->jbuf[2];
|
201 |
|
|
#endif
|
202 |
|
|
|
203 |
|
|
/* Otherwise we're out of luck for now. */
|
204 |
|
|
return (_Unwind_Word) 0;
|
205 |
|
|
}
|
206 |
|
|
|
207 |
|
|
void
|
208 |
|
|
_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
|
209 |
|
|
{
|
210 |
|
|
context->fc->data[index] = val;
|
211 |
|
|
}
|
212 |
|
|
|
213 |
|
|
/* Get the call-site index as saved in CONTEXT. */
|
214 |
|
|
|
215 |
|
|
_Unwind_Ptr
|
216 |
|
|
_Unwind_GetIP (struct _Unwind_Context *context)
|
217 |
|
|
{
|
218 |
|
|
return context->fc->call_site + 1;
|
219 |
|
|
}
|
220 |
|
|
|
221 |
|
|
_Unwind_Ptr
|
222 |
|
|
_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
|
223 |
|
|
{
|
224 |
|
|
*ip_before_insn = 0;
|
225 |
|
|
return context->fc->call_site + 1;
|
226 |
|
|
}
|
227 |
|
|
|
228 |
|
|
/* Set the return landing pad index in CONTEXT. */
|
229 |
|
|
|
230 |
|
|
void
|
231 |
|
|
_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
|
232 |
|
|
{
|
233 |
|
|
context->fc->call_site = val - 1;
|
234 |
|
|
}
|
235 |
|
|
|
236 |
|
|
void *
|
237 |
|
|
_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
|
238 |
|
|
{
|
239 |
|
|
return context->fc->lsda;
|
240 |
|
|
}
|
241 |
|
|
|
242 |
|
|
_Unwind_Ptr
|
243 |
|
|
_Unwind_GetRegionStart (struct _Unwind_Context *context __attribute__((unused)) )
|
244 |
|
|
{
|
245 |
|
|
return 0;
|
246 |
|
|
}
|
247 |
|
|
|
248 |
|
|
void *
|
249 |
|
|
_Unwind_FindEnclosingFunction (void *pc __attribute__((unused)))
|
250 |
|
|
{
|
251 |
|
|
return NULL;
|
252 |
|
|
}
|
253 |
|
|
|
254 |
|
|
#ifndef __ia64__
|
255 |
|
|
_Unwind_Ptr
|
256 |
|
|
_Unwind_GetDataRelBase (struct _Unwind_Context *context __attribute__((unused)) )
|
257 |
|
|
{
|
258 |
|
|
return 0;
|
259 |
|
|
}
|
260 |
|
|
|
261 |
|
|
_Unwind_Ptr
|
262 |
|
|
_Unwind_GetTextRelBase (struct _Unwind_Context *context __attribute__((unused)) )
|
263 |
|
|
{
|
264 |
|
|
return 0;
|
265 |
|
|
}
|
266 |
|
|
#endif
|
267 |
|
|
|
268 |
|
|
static inline _Unwind_Reason_Code
|
269 |
|
|
uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
270 |
|
|
{
|
271 |
|
|
if (context->fc == NULL)
|
272 |
|
|
{
|
273 |
|
|
fs->personality = NULL;
|
274 |
|
|
return _URC_END_OF_STACK;
|
275 |
|
|
}
|
276 |
|
|
else
|
277 |
|
|
{
|
278 |
|
|
fs->personality = context->fc->personality;
|
279 |
|
|
return _URC_NO_REASON;
|
280 |
|
|
}
|
281 |
|
|
}
|
282 |
|
|
|
283 |
|
|
static inline void
|
284 |
|
|
uw_update_context (struct _Unwind_Context *context,
|
285 |
|
|
_Unwind_FrameState *fs __attribute__((unused)) )
|
286 |
|
|
{
|
287 |
|
|
context->fc = context->fc->prev;
|
288 |
|
|
}
|
289 |
|
|
|
290 |
|
|
static void
|
291 |
|
|
uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
292 |
|
|
{
|
293 |
|
|
_Unwind_SjLj_Unregister (context->fc);
|
294 |
|
|
uw_update_context (context, fs);
|
295 |
|
|
}
|
296 |
|
|
|
297 |
|
|
static inline void
|
298 |
|
|
uw_init_context (struct _Unwind_Context *context)
|
299 |
|
|
{
|
300 |
|
|
context->fc = _Unwind_SjLj_GetContext ();
|
301 |
|
|
}
|
302 |
|
|
|
303 |
|
|
static void __attribute__((noreturn))
|
304 |
|
|
uw_install_context (struct _Unwind_Context *current __attribute__((unused)),
|
305 |
|
|
struct _Unwind_Context *target)
|
306 |
|
|
{
|
307 |
|
|
_Unwind_SjLj_SetContext (target->fc);
|
308 |
|
|
longjmp (target->fc->jbuf, 1);
|
309 |
|
|
}
|
310 |
|
|
|
311 |
|
|
static inline _Unwind_Ptr
|
312 |
|
|
uw_identify_context (struct _Unwind_Context *context)
|
313 |
|
|
{
|
314 |
|
|
return (_Unwind_Ptr) context->fc;
|
315 |
|
|
}
|
316 |
|
|
|
317 |
|
|
|
318 |
|
|
/* Play games with unwind symbols so that we can have call frame
|
319 |
|
|
and sjlj symbols in the same shared library. Not that you can
|
320 |
|
|
use them simultaneously... */
|
321 |
|
|
#define _Unwind_RaiseException _Unwind_SjLj_RaiseException
|
322 |
|
|
#define _Unwind_ForcedUnwind _Unwind_SjLj_ForcedUnwind
|
323 |
|
|
#define _Unwind_Resume _Unwind_SjLj_Resume
|
324 |
|
|
#define _Unwind_Resume_or_Rethrow _Unwind_SjLj_Resume_or_Rethrow
|
325 |
|
|
|
326 |
|
|
#include "unwind.inc"
|
327 |
|
|
|
328 |
|
|
#endif /* USING_SJLJ_EXCEPTIONS */
|