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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [syscall.c] - Blame information for rev 256

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/*==========================================================================
2
//
3
//      syscall.c
4
//
5
//      Redboot syscall handling for GNUPro bsp support
6
//
7
//==========================================================================
8
//####ECOSGPLCOPYRIGHTBEGIN####
9
// -------------------------------------------
10
// This file is part of eCos, the Embedded Configurable Operating System.
11
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
12
//
13
// eCos is free software; you can redistribute it and/or modify it under
14
// the terms of the GNU General Public License as published by the Free
15
// Software Foundation; either version 2 or (at your option) any later version.
16
//
17
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
19
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20
// for more details.
21
//
22
// You should have received a copy of the GNU General Public License along
23
// with eCos; if not, write to the Free Software Foundation, Inc.,
24
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25
//
26
// As a special exception, if other files instantiate templates or use macros
27
// or inline functions from this file, or you compile this file and link it
28
// with other works to produce a work based on this file, this file does not
29
// by itself cause the resulting work to be covered by the GNU General Public
30
// License. However the source code for this file must still be made available
31
// in accordance with section (3) of the GNU General Public License.
32
//
33
// This exception does not invalidate any other reasons why a work based on
34
// this file might be covered by the GNU General Public License.
35
//
36
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37
// at http://sources.redhat.com/ecos/ecos-license/
38
// -------------------------------------------
39
//####ECOSGPLCOPYRIGHTEND####
40
//==========================================================================
41
//#####DESCRIPTIONBEGIN####
42
//
43
// Author(s):    msalter
44
// Contributors: msalter
45
// Date:         1999-02-20
46
// Purpose:      Temporary support for gnupro bsp
47
//
48
//####DESCRIPTIONEND####
49
//
50
//=========================================================================*/
51
 
52
#include <redboot.h>
53
#include <cyg/hal/hal_intr.h>
54
#include <cyg/hal/drv_api.h>
55
#include <cyg/hal/hal_stub.h>
56
 
57
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS
58
 
59
#define NEWLIB_EIO 5              /* I/O error */
60
#define NEWLIB_ENOSYS 88          /* Syscall not supported */
61
 
62
/*
63
 * Clients of this BSP will need to have access to BSP functions and
64
 * data structures. Because, the client and the BSP may not be linked
65
 * together, a structure of vectors is used to gain this access. A
66
 * pointer to this structure can be gotten via a syscall. This syscall
67
 * is made automatically from within the crt0.o file.
68
 */
69
typedef struct {
70
    int         version;        /* version number for future expansion */
71
    const void **__ictrl_table;
72
    void **__exc_table;
73
    void *__dbg_vector;
74
    void *__kill_vector;
75
    void *__console_procs;
76
    void *__debug_procs;
77
    void (*__flush_dcache)(void *__p, int __nbytes);
78
    void (*__flush_icache)(void *__p, int __nbytes);
79
    void *__cpu_data;
80
    void *__board_data;
81
    void *__sysinfo;
82
    int  (*__set_debug_comm)(int __comm_id);
83
    int  (*__set_console_comm)(int __comm_id);
84
    int  (*__set_serial_baud)(int __comm_id, int baud);
85
    void *__dbg_data;
86
    void (*__reset)(void);
87
    int  __console_interrupt_flag;
88
} __shared_t;
89
 
90
static __shared_t __shared_data = { 2 };
91
 
92
// this is used by newlib's mode_t so we should match it
93
#ifdef __GNUC__
94
#define _ST_INT32 __attribute__ ((__mode__ (__SI__)))
95
#else
96
#define _ST_INT32
97
#endif
98
typedef unsigned int    newlib_mode_t _ST_INT32;
99
typedef short           newlib_dev_t;
100
typedef unsigned short  newlib_ino_t;
101
typedef unsigned short  newlib_nlink_t;
102
typedef long            newlib_off_t;
103
typedef unsigned short  newlib_uid_t;
104
typedef unsigned short  newlib_gid_t;
105
typedef long            newlib_time_t;
106
typedef long            newlib_long_t;
107
 
108
struct newlib_stat
109
{
110
    newlib_dev_t     st_dev;
111
    newlib_ino_t     st_ino;
112
    newlib_mode_t    st_mode;
113
    newlib_nlink_t   st_nlink;
114
    newlib_uid_t     st_uid;
115
    newlib_gid_t     st_gid;
116
    newlib_dev_t     st_rdev;
117
    newlib_off_t     st_size;
118
    // We assume we've been compiled with the same flags as newlib here
119
#if defined(__svr4__) && !defined(__PPC__) && !defined(__sun__)
120
    newlib_time_t    st_atime;
121
    newlib_time_t    st_mtime;
122
    newlib_time_t    st_ctime;
123
#else
124
    newlib_time_t    st_atime;
125
    newlib_long_t    st_spare1;
126
    newlib_time_t    st_mtime;
127
    newlib_long_t    st_spare2;
128
    newlib_time_t    st_ctime;
129
    newlib_long_t    st_spare3;
130
    newlib_long_t    st_blksize;
131
    newlib_long_t    st_blocks;
132
    newlib_long_t    st_spare4[2];
133
#endif
134
};
135
#define NEWLIB_S_IFCHR 0020000 // character special file
136
 
137
static inline char __getc(void)
138
{
139
    char c;
140
    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
141
 
142
    if (__chan)
143
        c = CYGACC_COMM_IF_GETC(*__chan);
144
    else {
145
        __chan = CYGACC_CALL_IF_DEBUG_PROCS();
146
        c = CYGACC_COMM_IF_GETC(*__chan);
147
    }
148
    return c;
149
}
150
 
151
static inline void __putc(char c)
152
{
153
    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
154
    if (__chan)
155
        CYGACC_COMM_IF_PUTC(*__chan, c);
156
    else {
157
        __chan = CYGACC_CALL_IF_DEBUG_PROCS();
158
        CYGACC_COMM_IF_PUTC(*__chan, c);
159
    }
160
}
161
 
162
 
163
static inline void __flush(void)
164
{
165
    hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
166
 
167
    if (__chan == NULL)
168
        __chan = CYGACC_CALL_IF_DEBUG_PROCS();
169
 
170
    CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_FLUSH_OUTPUT);
171
}
172
 
173
// Timer support
174
 
175
static cyg_handle_t  sys_timer_handle;
176
static cyg_interrupt sys_timer_interrupt;
177
static cyg_uint64    sys_timer_ticks = 0;
178
 
179
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
180
 
181
static unsigned int set_period = CYGNUM_HAL_RTC_PERIOD; // The default
182
 
183
typedef void *callback_func( char *pc, char *sp );
184
static callback_func *timer_callback = 0;
185
 
186
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
187
 
188
static void
189
sys_timer_dsr(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
190
{
191
    // do nothing
192
}
193
 
194
 
195
static cyg_uint32
196
sys_timer_isr(cyg_vector_t vector, cyg_addrword_t data)
197
{
198
    ++sys_timer_ticks;
199
 
200
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
201
    HAL_CLOCK_RESET(CYGNUM_HAL_INTERRUPT_RTC, set_period);
202
#else
203
    HAL_CLOCK_RESET(CYGNUM_HAL_INTERRUPT_RTC, CYGNUM_HAL_RTC_PERIOD);
204
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
205
 
206
    cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_RTC);
207
 
208
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
209
    if ( timer_callback ) {
210
        char *intrpc = (char *)0;
211
        char *intrsp = (char *)0;
212
 
213
        // There may be a number of ways to get the PC and (optional) SP
214
        // information out of the HAL.  Hence this is conditioned.  In some
215
        // configurations, a register-set pointer is available as
216
        // (invisible) argument 3 to this ISR call.
217
 
218
#ifdef HAL_GET_PROFILE_INFO
219
        HAL_GET_PROFILE_INFO( intrpc, intrsp );
220
#endif // HAL_GET_PROFILE_INFO available
221
 
222
        CYGARC_HAL_SAVE_GP();
223
        timer_callback( intrpc, intrsp );
224
        CYGARC_HAL_RESTORE_GP();
225
    }
226
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
227
    return CYG_ISR_HANDLED;
228
}
229
 
230
 
231
static void sys_timer_init(void)
232
{
233
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
234
    HAL_CLOCK_INITIALIZE(set_period);
235
#else
236
    HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD);
237
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
238
 
239
    cyg_drv_interrupt_create(
240
        CYGNUM_HAL_INTERRUPT_RTC,
241
        0,                      // Priority - unused
242
        (CYG_ADDRWORD)0,        // Data item passed to ISR & DSR
243
        sys_timer_isr,          // ISR
244
        sys_timer_dsr,          // DSR
245
        &sys_timer_handle,      // handle to intr obj
246
        &sys_timer_interrupt ); // space for int obj
247
 
248
    cyg_drv_interrupt_attach(sys_timer_handle);
249
 
250
    cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_RTC);
251
}
252
 
253
 
254
//
255
// read  -- read bytes from the serial port. Ignore fd, since
256
//          we only have stdin.
257
static int
258
sys_read(int fd, char *buf, int nbytes)
259
{
260
    int i = 0;
261
 
262
    for (i = 0; i < nbytes; i++) {
263
        *(buf + i) = __getc();
264
        if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
265
            (*(buf + i + 1)) = 0;
266
            break;
267
        }
268
    }
269
    return (i);
270
}
271
 
272
 
273
//
274
// write -- write bytes to the serial port. Ignore fd, since
275
//          stdout and stderr are the same. Since we have no filesystem,
276
//          open will only return an error.
277
//
278
static int
279
sys_write(int fd, char *buf, int nbytes)
280
{
281
#define WBUFSIZE  256
282
    int  tosend;
283
 
284
    tosend = nbytes;
285
 
286
    while (tosend > 0) {
287
        if (*buf == '\n')
288
            __putc('\r');
289
        __putc(*buf++);
290
        tosend--;
291
    }
292
    __flush();
293
 
294
    return (nbytes);
295
}
296
 
297
 
298
//
299
// open -- open a file descriptor. We don't have a filesystem, so
300
//         we return an error.
301
//
302
static int
303
sys_open (const char *buf, int flags, int mode)
304
{
305
    return (-NEWLIB_EIO);
306
}
307
 
308
//
309
// close -- We don't need to do anything, but pretend we did.
310
//
311
static int
312
sys_close(int fd)
313
{
314
    return (0);
315
}
316
 
317
 
318
//
319
// lseek --  Since a serial port is non-seekable, we return an error.
320
//
321
static int
322
sys_lseek(int fd,  int offset, int whence)
323
{
324
    return (-NEWLIB_EIO);
325
}
326
 
327
 
328
#define NS_PER_TICK    (CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR)
329
#define TICKS_PER_SEC  (1000000000ULL / NS_PER_TICK)
330
 
331
// This needs to match newlib HZ which is normally 60.
332
#define HZ (60ULL)
333
 
334
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
335
static unsigned int set_freq   = TICKS_PER_SEC; // The default
336
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
337
static int
338
sys_times(unsigned long *p)
339
{
340
    static int inited = 0;
341
 
342
    if (!inited) {
343
        inited = 1;
344
        sys_timer_init();
345
    }
346
 
347
    /* target clock runs at CLOCKS_PER_SEC. Convert to HZ */
348
    if (p)
349
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
350
        *p = (sys_timer_ticks * HZ) / (cyg_uint64)set_freq;
351
#else
352
        *p = (sys_timer_ticks * HZ) / TICKS_PER_SEC;
353
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
354
 
355
    return 0;
356
}
357
 
358
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
359
 
360
static void sys_profile_call_back( char *func, char **previous_call_back )
361
{
362
    if ( previous_call_back )
363
        *previous_call_back = (char *)timer_callback;
364
 
365
    timer_callback = (callback_func *)func;
366
 
367
    // Ensure the timer is started
368
    (void)sys_times( (unsigned long *)0 );
369
}
370
 
371
static void sys_profile_frequency( int freq, int *previous_freq )
372
{
373
// Requested HZ:
374
// 0         => tell me the current value (no change, IMPLEMENTED HERE)
375
// - 1       => tell me the slowest (no change)
376
// - 2       => tell me the default (no change, IMPLEMENTED HERE)
377
// -nnn      => tell me what you would choose for nnn (no change)
378
// MIN_INT   => tell me the fastest (no change)
379
//        
380
// 1         => tell me the slowest (sets the clock)
381
// MAX_INT   => tell me the fastest (sets the clock)
382
 
383
    // Ensure the timer is started
384
    (void)sys_times( (unsigned long *)0 );
385
 
386
    if ( -2 == freq )
387
        freq = TICKS_PER_SEC; // default value
388
    else if ( 0 == freq )
389
        freq = set_freq; // collect current value
390
    else {
391
        int do_set_freq = (freq > 0);
392
        unsigned int period = CYGNUM_HAL_RTC_PERIOD;
393
 
394
        if ( 0 == (freq ^ -freq) ) // Then it's MIN_INT in local size
395
            freq++; // just so that it will negate correctly
396
 
397
        // Then set the timer to that fast - or pass on the enquiry
398
#ifdef HAL_CLOCK_REINITIALIZE
399
        // Give the HAL enough info to do the division sum relative to
400
        // the default setup, in period and TICKS_PER_SEC.
401
        HAL_CLOCK_REINITIALIZE( freq, period, TICKS_PER_SEC );
402
#else
403
        freq = TICKS_PER_SEC; // the only choice
404
#endif
405
        if ( do_set_freq ) { // update the global variables
406
            unsigned int orig = set_freq;
407
            set_freq = freq;
408
            set_period = period;
409
            // We must "correct" sys_timer_ticks for the new scale factor.
410
            sys_timer_ticks = sys_timer_ticks * set_freq / orig;
411
        }
412
    }
413
 
414
    if ( previous_freq ) // Return the current value (new value)
415
        *previous_freq = freq;
416
}
417
 
418
void sys_profile_reset( void )
419
{
420
    timer_callback = NULL;
421
// Want to preserve the frequency between runs, for clever GDB users!
422
//    sys_profile_frequency( TICKS_PER_SEC, NULL );
423
}
424
 
425
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
426
 
427
//
428
//  Generic syscall handler.
429
//
430
//  Returns 0 if syscall number is not handled by this
431
//  module, 1 otherwise. This allows applications to
432
//  extend the syscall handler by using exception chaining.
433
//
434
CYG_ADDRWORD
435
__do_syscall(CYG_ADDRWORD func,                 // syscall function number
436
             CYG_ADDRWORD arg1, CYG_ADDRWORD arg2,      // up to four args.
437
             CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,
438
             CYG_ADDRWORD *retval, CYG_ADDRWORD *sig)   // syscall return value
439
{
440
    int err = 0;
441
    *sig = 0;
442
 
443
    switch (func) {
444
 
445
      case SYS_open:
446
      {
447
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
448
          __externC int cyg_hal_gdbfileio_open( const char *name, int flags,
449
                                                int mode, int *sig );
450
          if (gdb_active)
451
              err = cyg_hal_gdbfileio_open((const char *)arg1, (int)arg2, (int)arg3,
452
                                           (int *)sig);
453
          else
454
#endif
455
              err = sys_open((const char *)arg1, (int)arg2, (int)arg3);
456
          break;
457
      }
458
      case SYS_read:
459
      {
460
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
461
          __externC int cyg_hal_gdbfileio_read( int fd, void *buf, size_t count,
462
                                                int *sig );
463
          if (gdb_active)
464
              err = cyg_hal_gdbfileio_read((int)arg1, (void *)arg2, (size_t)arg3,
465
                                           (int *)sig);
466
          else
467
#endif
468
              err = sys_read((int)arg1, (char *)arg2, (int)arg3);
469
          break;
470
      }
471
      case SYS_write:
472
      {
473
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
474
          __externC int cyg_hal_gdbfileio_write( int fd, const void *buf,
475
                                                 size_t count, int *sig );
476
          if (gdb_active)
477
              err = cyg_hal_gdbfileio_write((int)arg1, (const void *)arg2,
478
                                            (size_t)arg3, (int *)sig);
479
          else
480
#endif
481
              err = sys_write((int)arg1, (char *)arg2, (int)arg3);
482
          break;
483
      }
484
      case SYS_close:
485
      {
486
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
487
          __externC int cyg_hal_gdbfileio_close( int fd, int *sig );
488
          if (gdb_active)
489
              err = cyg_hal_gdbfileio_close((int)arg1, (int *)sig);
490
          else
491
#endif
492
              err = sys_close((int)arg1);
493
          break;
494
      }
495
      case SYS_lseek:
496
      {
497
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
498
          __externC int cyg_hal_gdbfileio_lseek( int fd, long offset,
499
                                                 int whence, int *sig );
500
          if (gdb_active)
501
              err = cyg_hal_gdbfileio_lseek((int)arg1, (long)arg2, (int)arg3,
502
                                            (int *)sig);
503
          else
504
#endif
505
              err = sys_lseek((int)arg1, (int)arg2, (int)arg3);
506
          break;
507
      }
508
      case SYS_stat:
509
      {
510
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
511
          __externC int cyg_hal_gdbfileio_stat( const char *pathname,
512
                                                void *statbuf, int *sig );
513
          if (gdb_active)
514
              err = cyg_hal_gdbfileio_stat((const char *)arg1, (void *)arg2,
515
                                           (int *)sig);
516
          else
517
#endif
518
              err = -NEWLIB_ENOSYS;
519
          break;
520
      }
521
      case SYS_fstat:
522
      {
523
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
524
          __externC int cyg_hal_gdbfileio_fstat( int fd, void *statbuf,
525
                                                 int *sig );
526
          if (gdb_active)
527
              err = cyg_hal_gdbfileio_fstat((int)arg1, (void *)arg2,
528
                                            (int *)sig);
529
          else
530
#endif
531
          {
532
              struct newlib_stat *st = (struct newlib_stat *)arg2;
533
              st->st_mode = NEWLIB_S_IFCHR;
534
              st->st_blksize = 4096;
535
              err = 0;
536
          }
537
          break;
538
      }
539
      case SYS_rename:
540
      {
541
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
542
          __externC int cyg_hal_gdbfileio_rename( const char *oldpath,
543
                                                  const char *newpath,
544
                                                  int *sig );
545
          if (gdb_active)
546
              err = cyg_hal_gdbfileio_rename((const char *)arg1, (const char *)arg2,
547
                                             (int *)sig);
548
          else
549
#endif
550
              err = -NEWLIB_ENOSYS;
551
          break;
552
      }
553
      case SYS_unlink:
554
      {
555
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
556
          __externC int cyg_hal_gdbfileio_unlink( const char *pathname,
557
                                                  int *sig );
558
          if (gdb_active)
559
              err = cyg_hal_gdbfileio_unlink((const char *)arg1, (int *)sig);
560
          else
561
#endif
562
              err = -NEWLIB_ENOSYS;
563
          break;
564
      }
565
      case SYS_isatty:
566
      {
567
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
568
          __externC int cyg_hal_gdbfileio_isatty( int fd, int *sig );
569
          if (gdb_active)
570
              err = cyg_hal_gdbfileio_isatty((int)arg1, (int *)sig);
571
          else
572
#endif
573
              err = 1;
574
          break;
575
      }
576
      case SYS_system:
577
      {
578
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
579
          __externC int cyg_hal_gdbfileio_system( const char *command,
580
                                                  int *sig );
581
          if (gdb_active)
582
              err = cyg_hal_gdbfileio_system((const char *)arg1, (int *)sig);
583
          else
584
#endif
585
              err = -1;
586
          break;
587
      }
588
      case SYS_gettimeofday:
589
      {
590
#ifdef CYGPKG_HAL_GDB_FILEIO // File I/O over the GDB remote protocol
591
          __externC int cyg_hal_gdbfileio_gettimeofday( void *tv, void *tz,
592
                                                        int *sig );
593
          if (gdb_active)
594
              err = cyg_hal_gdbfileio_gettimeofday((void *)arg1, (void *)arg2,
595
                                                   (int *)sig);
596
          else
597
#endif
598
              err = 0;
599
          break;
600
      }
601
      case SYS_utime:
602
        // FIXME. Some libglosses depend on this behavior.
603
        err = sys_times((unsigned long *)arg1);
604
        break;
605
 
606
      case SYS_times:
607
        err = sys_times((unsigned long *)arg1);
608
        break;
609
 
610
      case SYS_meminfo:
611
        err = 1;
612
        *(unsigned long *)arg1 = (unsigned long)(ram_end-ram_start);
613
        *(unsigned long *)arg2 = (unsigned long)ram_end;
614
        break;
615
#ifdef CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
616
    case SYS_timer_call_back:
617
        sys_profile_call_back( (char *)arg1, (char **)arg2 );
618
        break;
619
 
620
    case SYS_timer_frequency:
621
        sys_profile_frequency( (int)arg1, (unsigned int *)arg2 );
622
        break;
623
 
624
    case SYS_timer_reset:
625
        sys_profile_reset();
626
        break;
627
 
628
#endif // CYGSEM_REDBOOT_BSP_SYSCALLS_GPROF
629
      case __GET_SHARED:
630
        *(__shared_t **)arg1 = &__shared_data;
631
        break;
632
 
633
      case SYS_exit:
634
        if (gdb_active) {
635
            *sig = SIGTRAP;
636
            err = func;
637
        } else {
638
            CYGACC_CALL_IF_MONITOR_RETURN(arg1);
639
            // never returns
640
        }
641
        break;
642
 
643
      default:
644
        return 0;
645
    }
646
 
647
    *retval = err;
648
    return 1;
649
}
650
 
651
#endif

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