1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
|
//==========================================================================
//
// except.cxx
//
// POSIX exception translation
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): nickg
// Contributors: nickg
// Date: 2000-03-27
// Purpose: POSIX exception translation
// Description: This file contains code to translate eCos hardware
// exceptions into POSIX signals.
//
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <pkgconf/hal.h>
#include <pkgconf/kernel.h>
#include <pkgconf/posix.h>
#include <cyg/kernel/ktypes.h> // base kernel types
#include <cyg/infra/cyg_trac.h> // tracing macros
#include <cyg/infra/cyg_ass.h> // assertion macros
#include <cyg/infra/diag.h>
#include "pprivate.h" // POSIX private header
#include <signal.h> // our header
#include <cyg/kernel/thread.inl>
//==========================================================================
// Translation table from eCos exceptions to POSIX signals.
static const struct
{
cyg_code exception;
int signal;
} exception_signal_mapping[] =
{
#ifdef CYGNUM_HAL_EXCEPTION_DATA_ACCESS
{CYGNUM_HAL_EXCEPTION_DATA_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_WRITE
{CYGNUM_HAL_EXCEPTION_DATA_WRITE, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_ACCESS
{CYGNUM_HAL_EXCEPTION_CODE_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_WRITE
{CYGNUM_HAL_EXCEPTION_CODE_WRITE, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_EXECUTE
{CYGNUM_HAL_EXCEPTION_CODE_EXECUTE, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_IO_ACCESS
{CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_IO_WRITE
{CYGNUM_HAL_EXCEPTION_IO_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS
{CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_ACCESS, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE
{CYGNUM_HAL_EXCEPTION_DATA_TLBMISS_WRITE, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS
{CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_ACCESS, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE
{CYGNUM_HAL_EXCEPTION_CODE_TLBMISS_WRITE, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS
{CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_ACCESS, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE
{CYGNUM_HAL_EXCEPTION_DATA_TLBERROR_WRITE, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS
{CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_ACCESS, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE
{CYGNUM_HAL_EXCEPTION_CODE_TLBERROR_WRITE, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS
{CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE
{CYGNUM_HAL_EXCEPTION_DATA_UNALIGNED_WRITE, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS
{CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_ACCESS, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE
{CYGNUM_HAL_EXCEPTION_IO_UNALIGNED_WRITE, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION
{CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION, SIGILL},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_INTERRUPT
{CYGNUM_HAL_EXCEPTION_INTERRUPT, SIGINT},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_TRAP
{CYGNUM_HAL_EXCEPTION_TRAP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO
{CYGNUM_HAL_EXCEPTION_DIV_BY_ZERO, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_OVERFLOW
{CYGNUM_HAL_EXCEPTION_OVERFLOW, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_BOUNDS
{CYGNUM_HAL_EXCEPTION_BOUNDS, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_SINGLE_STEP
{CYGNUM_HAL_EXCEPTION_SINGLE_STEP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP
{CYGNUM_HAL_EXCEPTION_INSTRUCTION_BP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP
{CYGNUM_HAL_EXCEPTION_PERIPHERAL_BP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DATA_BP
{CYGNUM_HAL_EXCEPTION_DATA_BP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP
{CYGNUM_HAL_EXCEPTION_DEVELOPMENT_BP, SIGTRAP},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW
{CYGNUM_HAL_EXCEPTION_STACK_OVERFLOW, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_STACK_FAULT
{CYGNUM_HAL_EXCEPTION_STACK_FAULT, SIGSEGV},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_PARITY
{CYGNUM_HAL_EXCEPTION_PARITY, SIGBUS},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_FPU
{CYGNUM_HAL_EXCEPTION_FPU, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL
{CYGNUM_HAL_EXCEPTION_FPU_NOT_AVAIL, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW
{CYGNUM_HAL_EXCEPTION_FPU_OVERFLOW, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW
{CYGNUM_HAL_EXCEPTION_FPU_UNDERFLOW, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO
{CYGNUM_HAL_EXCEPTION_FPU_DIV_BY_ZERO, SIGFPE},
#endif
#ifdef CYGNUM_HAL_EXCEPTION_SYSTEM_CALL
{CYGNUM_HAL_EXCEPTION_SYSTEM_CALL, SIGSYS},
#endif
{0, 0} // dummy value to ensure compiler is happy
};
//==========================================================================
// POSIX exception handler
static void cyg_posix_exception_handler(
CYG_ADDRWORD data, // user supplied data == signal number
cyg_code exception_number, // exception being raised
CYG_ADDRWORD exception_info // any exception specific info
)
{
int signo = 0;
pthread_info *self = pthread_self_info();
if( self == NULL )
{
// Not a POSIX thread, just return
return;
}
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
signo = data;
#else
for( int i = 0; exception_signal_mapping[i].signal != 0; i++ )
{
if( exception_signal_mapping[i].exception == exception_number )
{
signo = exception_signal_mapping[i].signal;
break;
}
}
#endif
if( sigismember( &self->sigmask, signo ) )
{
// The signal is masked in the current thread. POSIX says that
// the behaviour is undefined here. We choose to ignore it.
return;
}
// The kernel exception handler may have disabled interrupts, so
// we (re-)enable them here. From this point on we are running in
// a context that is effectively just pushed onto the stack of the
// current thread. If we return we will unwind and resume
// execution from the excepting code. We can also, in theory,
// longjump out of the signal handler, and although that is
// deprecated, we make sure in cyg_deliver_signals() that it is
// possible to do it.
HAL_ENABLE_INTERRUPTS();
struct sigevent sev;
sev.sigev_notify = SIGEV_SIGNAL;
sev.sigev_signo = signo;
sev.sigev_value.sival_ptr = (void *)exception_info;
// Generate the signal
cyg_sigqueue( &sev, SI_EXCEPT );
// And try to deliver it
cyg_deliver_signals();
}
//==========================================================================
// Install all the exception handlers
static void install_handlers( Cyg_Thread *thread)
{
#ifdef CYGSEM_KERNEL_EXCEPTIONS_DECODE
// With decoded exceptions, we must install a separate exception
// handler for each supported exception.
for( int i = 0; exception_signal_mapping[i].signal != 0; i++ )
{
thread->register_exception( exception_signal_mapping[i].exception,
cyg_posix_exception_handler,
exception_signal_mapping[i].signal,
NULL,
NULL);
}
#else
// Otherwise there is just one exception handler for all exceptions.
thread->register_exception( CYGNUM_HAL_EXCEPTION_MIN,
cyg_posix_exception_handler,
0,
NULL,
NULL);
#endif
}
//==========================================================================
// Initialization
externC void cyg_posix_exception_start()
{
#ifdef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL
// With global exceptions, we only need to install a single static
// set of exception handlers. Note that by this point in system
// initialization the idle thread should be installed as the
// current thread, so we pass a pointer to that to
// install_handlers(). The identity of the thread passed is
// actually irrelevant in this case and is just used as a handle
// into the thread class.
install_handlers( Cyg_Thread::self() );
#endif
}
//==========================================================================
// Per thread exception initialization and destruction
externC void cyg_pthread_exception_init(pthread_info *thread)
{
#ifndef CYGSEM_KERNEL_EXCEPTIONS_GLOBAL
// With non-global exceptions we must install a new set of handlers
// for each thread.
install_handlers( thread->thread );
#endif
}
externC void cyg_pthread_exception_destroy(pthread_info *thread)
{
// Nothing to do at present.
}
// -------------------------------------------------------------------------
// EOF except.cxx
|
