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2894 svoboda 1
/*
2
 * Copyright (c) 2008 Jiri Svoboda
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
2887 svoboda 29
/** @addtogroup generic
30
 * @{
31
 */
32
 
33
/**
34
 * @file
2894 svoboda 35
 * @brief   Udebug operations.
3471 svoboda 36
 *
37
 * Udebug operations on tasks and threads are implemented here. The
38
 * functions defined here are called from the udebug_ipc module
39
 * when servicing udebug IPC messages.
2887 svoboda 40
 */
41
 
3471 svoboda 42
#include <debug.h>
2887 svoboda 43
#include <proc/task.h>
44
#include <proc/thread.h>
45
#include <arch.h>
46
#include <errno.h>
4377 svoboda 47
#include <print.h>
2887 svoboda 48
#include <syscall/copy.h>
49
#include <ipc/ipc.h>
50
#include <udebug/udebug.h>
51
#include <udebug/udebug_ops.h>
52
 
53
/**
54
 * Prepare a thread for a debugging operation.
55
 *
3018 svoboda 56
 * Simply put, return thread t with t->udebug.lock held,
2887 svoboda 57
 * but only if it verifies all conditions.
58
 *
59
 * Specifically, verifies that thread t exists, is a userspace thread,
2898 svoboda 60
 * and belongs to the current task (TASK). Verifies, that the thread
3606 svoboda 61
 * is (or is not) go according to being_go (typically false).
3684 svoboda 62
 * It also locks t->udebug.lock, making sure that t->udebug.active
3026 svoboda 63
 * is true - that the thread is in a valid debugging session.
2887 svoboda 64
 *
3026 svoboda 65
 * With this verified and the t->udebug.lock mutex held, it is ensured
66
 * that the thread cannot leave the debugging session, let alone cease
67
 * to exist.
68
 *
69
 * In this function, holding the TASK->udebug.lock mutex prevents the
70
 * thread from leaving the debugging session, while relaxing from
71
 * the t->lock spinlock to the t->udebug.lock mutex.
72
 *
3471 svoboda 73
 * @param t     Pointer, need not at all be valid.
3606 svoboda 74
 * @param being_go  Required thread state.
3471 svoboda 75
 *
2887 svoboda 76
 * Returns EOK if all went well, or an error code otherwise.
77
 */
3606 svoboda 78
static int _thread_op_begin(thread_t *t, bool being_go)
2887 svoboda 79
{
80
    task_id_t taskid;
3026 svoboda 81
    ipl_t ipl;
2887 svoboda 82
 
83
    taskid = TASK->taskid;
84
 
3026 svoboda 85
    mutex_lock(&TASK->udebug.lock);
86
 
87
    /* thread_exists() must be called with threads_lock held */
88
    ipl = interrupts_disable();
2887 svoboda 89
    spinlock_lock(&threads_lock);
90
 
91
    if (!thread_exists(t)) {
92
        spinlock_unlock(&threads_lock);
3026 svoboda 93
        interrupts_restore(ipl);
94
        mutex_unlock(&TASK->udebug.lock);
2887 svoboda 95
        return ENOENT;
96
    }
97
 
3026 svoboda 98
    /* t->lock is enough to ensure the thread's existence */
2887 svoboda 99
    spinlock_lock(&t->lock);
3026 svoboda 100
    spinlock_unlock(&threads_lock);
2887 svoboda 101
 
3606 svoboda 102
    /* Verify that 't' is a userspace thread. */
2887 svoboda 103
    if ((t->flags & THREAD_FLAG_USPACE) == 0) {
104
        /* It's not, deny its existence */
3026 svoboda 105
        spinlock_unlock(&t->lock);
106
        interrupts_restore(ipl);
107
        mutex_unlock(&TASK->udebug.lock);
108
        return ENOENT;
2887 svoboda 109
    }
110
 
3606 svoboda 111
    /* Verify debugging state. */
3684 svoboda 112
    if (t->udebug.active != true) {
2898 svoboda 113
        /* Not in debugging session or undesired GO state */
3026 svoboda 114
        spinlock_unlock(&t->lock);
115
        interrupts_restore(ipl);
116
        mutex_unlock(&TASK->udebug.lock);
117
        return ENOENT;
2887 svoboda 118
    }
119
 
3026 svoboda 120
    /*
3684 svoboda 121
     * Since the thread has active == true, TASK->udebug.lock
122
     * is enough to ensure its existence and that active remains
3026 svoboda 123
     * true.
124
     */
2887 svoboda 125
    spinlock_unlock(&t->lock);
3026 svoboda 126
    interrupts_restore(ipl);
2887 svoboda 127
 
3606 svoboda 128
    /* Only mutex TASK->udebug.lock left. */
3026 svoboda 129
 
3606 svoboda 130
    /* Now verify that the thread belongs to the current task. */
3026 svoboda 131
    if (t->task != TASK) {
132
        /* No such thread belonging this task*/
133
        mutex_unlock(&TASK->udebug.lock);
134
        return ENOENT;
135
    }
2887 svoboda 136
 
3026 svoboda 137
    /*
138
     * Now we need to grab the thread's debug lock for synchronization
139
     * of the threads stoppability/stop state.
140
     */
141
    mutex_lock(&t->udebug.lock);
2887 svoboda 142
 
3606 svoboda 143
    /* The big task mutex is no longer needed. */
3026 svoboda 144
    mutex_unlock(&TASK->udebug.lock);
2887 svoboda 145
 
3606 svoboda 146
    if (t->udebug.go != being_go) {
147
        /* Not in debugging session or undesired GO state. */
3026 svoboda 148
        mutex_unlock(&t->udebug.lock);
149
        return EINVAL;
150
    }
2887 svoboda 151
 
3606 svoboda 152
    /* Only t->udebug.lock left. */
3026 svoboda 153
 
3606 svoboda 154
    return EOK; /* All went well. */
2887 svoboda 155
}
156
 
3471 svoboda 157
/** End debugging operation on a thread. */
2887 svoboda 158
static void _thread_op_end(thread_t *t)
159
{
3026 svoboda 160
    mutex_unlock(&t->udebug.lock);
2887 svoboda 161
}
162
 
3471 svoboda 163
/** Begin debugging the current task.
164
 *
165
 * Initiates a debugging session for the current task (and its threads).
166
 * When the debugging session has started a reply will be sent to the
167
 * UDEBUG_BEGIN call. This may happen immediately in this function if
168
 * all the threads in this task are stoppable at the moment and in this
169
 * case the function returns 1.
170
 *
171
 * Otherwise the function returns 0 and the reply will be sent as soon as
172
 * all the threads become stoppable (i.e. they can be considered stopped).
173
 *
174
 * @param call  The BEGIN call we are servicing.
175
 * @return  0 (OK, but not done yet), 1 (done) or negative error code.
2887 svoboda 176
 */
177
int udebug_begin(call_t *call)
178
{
179
    int reply;
180
 
181
    thread_t *t;
182
    link_t *cur;
183
 
3471 svoboda 184
    LOG("udebug_begin()\n");
2887 svoboda 185
 
3016 svoboda 186
    mutex_lock(&TASK->udebug.lock);
3471 svoboda 187
    LOG("debugging task %llu\n", TASK->taskid);
2887 svoboda 188
 
3014 svoboda 189
    if (TASK->udebug.dt_state != UDEBUG_TS_INACTIVE) {
3016 svoboda 190
        mutex_unlock(&TASK->udebug.lock);
3471 svoboda 191
        LOG("udebug_begin(): busy error\n");
2887 svoboda 192
 
193
        return EBUSY;
194
    }
195
 
3014 svoboda 196
    TASK->udebug.dt_state = UDEBUG_TS_BEGINNING;
197
    TASK->udebug.begin_call = call;
198
    TASK->udebug.debugger = call->sender;
2887 svoboda 199
 
3014 svoboda 200
    if (TASK->udebug.not_stoppable_count == 0) {
201
        TASK->udebug.dt_state = UDEBUG_TS_ACTIVE;
202
        TASK->udebug.begin_call = NULL;
2887 svoboda 203
        reply = 1; /* immediate reply */
204
    } else {
205
        reply = 0; /* no reply */
206
    }
207
 
3684 svoboda 208
    /* Set udebug.active on all of the task's userspace threads. */
2887 svoboda 209
 
210
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
211
        t = list_get_instance(cur, thread_t, th_link);
212
 
3026 svoboda 213
        mutex_lock(&t->udebug.lock);
2887 svoboda 214
        if ((t->flags & THREAD_FLAG_USPACE) != 0)
3684 svoboda 215
            t->udebug.active = true;
3026 svoboda 216
        mutex_unlock(&t->udebug.lock);
2887 svoboda 217
    }
218
 
3016 svoboda 219
    mutex_unlock(&TASK->udebug.lock);
2887 svoboda 220
 
3471 svoboda 221
    LOG("udebug_begin() done (%s)\n",
2887 svoboda 222
        reply ? "reply" : "stoppability wait");
223
 
224
    return reply;
225
}
226
 
3471 svoboda 227
/** Finish debugging the current task.
228
 *
229
 * Closes the debugging session for the current task.
230
 * @return Zero on success or negative error code.
231
 */
2887 svoboda 232
int udebug_end(void)
233
{
234
    int rc;
235
 
3471 svoboda 236
    LOG("udebug_end()\n");
2887 svoboda 237
 
3016 svoboda 238
    mutex_lock(&TASK->udebug.lock);
3471 svoboda 239
    LOG("task %" PRIu64 "\n", TASK->taskid);
2887 svoboda 240
 
241
    rc = udebug_task_cleanup(TASK);
242
 
3016 svoboda 243
    mutex_unlock(&TASK->udebug.lock);
2887 svoboda 244
 
3016 svoboda 245
    return rc;
2887 svoboda 246
}
247
 
3471 svoboda 248
/** Set the event mask.
249
 *
250
 * Sets the event mask that determines which events are enabled.
251
 *
252
 * @param mask  Or combination of events that should be enabled.
253
 * @return  Zero on success or negative error code.
254
 */
2899 svoboda 255
int udebug_set_evmask(udebug_evmask_t mask)
256
{
3471 svoboda 257
    LOG("udebug_set_mask()\n");
2899 svoboda 258
 
3016 svoboda 259
    mutex_lock(&TASK->udebug.lock);
2899 svoboda 260
 
3014 svoboda 261
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
3016 svoboda 262
        mutex_unlock(&TASK->udebug.lock);
3471 svoboda 263
        LOG("udebug_set_mask(): not active debuging session\n");
2899 svoboda 264
 
265
        return EINVAL;
266
    }
267
 
3014 svoboda 268
    TASK->udebug.evmask = mask;
2899 svoboda 269
 
3016 svoboda 270
    mutex_unlock(&TASK->udebug.lock);
2899 svoboda 271
 
272
    return 0;
273
}
274
 
3471 svoboda 275
/** Give thread GO.
276
 *
3606 svoboda 277
 * Upon recieving a go message, the thread is given GO. Being GO
3471 svoboda 278
 * means the thread is allowed to execute userspace code (until
279
 * a debugging event or STOP occurs, at which point the thread loses GO.
280
 *
281
 * @param t The thread to operate on (unlocked and need not be valid).
282
 * @param call  The GO call that we are servicing.
283
 */
2887 svoboda 284
int udebug_go(thread_t *t, call_t *call)
285
{
286
    int rc;
287
 
3606 svoboda 288
    /* On success, this will lock t->udebug.lock. */
2898 svoboda 289
    rc = _thread_op_begin(t, false);
2887 svoboda 290
    if (rc != EOK) {
291
        return rc;
292
    }
293
 
3018 svoboda 294
    t->udebug.go_call = call;
3606 svoboda 295
    t->udebug.go = true;
3018 svoboda 296
    t->udebug.cur_event = 0;    /* none */
2887 svoboda 297
 
298
    /*
3606 svoboda 299
     * Neither t's lock nor threads_lock may be held during wakeup.
2887 svoboda 300
     */
3018 svoboda 301
    waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST);
2887 svoboda 302
 
303
    _thread_op_end(t);
304
 
305
    return 0;
306
}
307
 
3471 svoboda 308
/** Stop a thread (i.e. take its GO away)
309
 *
310
 * Generates a STOP event as soon as the thread becomes stoppable (i.e.
311
 * can be considered stopped).
312
 *
313
 * @param t The thread to operate on (unlocked and need not be valid).
314
 * @param call  The GO call that we are servicing.
315
 */
2898 svoboda 316
int udebug_stop(thread_t *t, call_t *call)
317
{
318
    int rc;
2887 svoboda 319
 
3471 svoboda 320
    LOG("udebug_stop()\n");
2898 svoboda 321
 
322
    /*
3018 svoboda 323
     * On success, this will lock t->udebug.lock. Note that this makes sure
2898 svoboda 324
     * the thread is not stopped.
325
     */
326
    rc = _thread_op_begin(t, true);
327
    if (rc != EOK) {
328
        return rc;
329
    }
330
 
3606 svoboda 331
    /* Take GO away from the thread. */
332
    t->udebug.go = false;
2898 svoboda 333
 
3606 svoboda 334
    if (t->udebug.stoppable != true) {
335
        /* Answer will be sent when the thread becomes stoppable. */
2898 svoboda 336
        _thread_op_end(t);
337
        return 0;
338
    }
339
 
340
    /*
3606 svoboda 341
     * Answer GO call.
2898 svoboda 342
     */
3471 svoboda 343
    LOG("udebug_stop - answering go call\n");
2898 svoboda 344
 
3606 svoboda 345
    /* Make sure nobody takes this call away from us. */
3018 svoboda 346
    call = t->udebug.go_call;
347
    t->udebug.go_call = NULL;
2898 svoboda 348
 
349
    IPC_SET_RETVAL(call->data, 0);
350
    IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);
3471 svoboda 351
    LOG("udebug_stop/ipc_answer\n");
2898 svoboda 352
 
3018 svoboda 353
    THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;
3016 svoboda 354
 
2898 svoboda 355
    _thread_op_end(t);
356
 
3606 svoboda 357
    mutex_lock(&TASK->udebug.lock);
2898 svoboda 358
    ipc_answer(&TASK->answerbox, call);
3016 svoboda 359
    mutex_unlock(&TASK->udebug.lock);
2898 svoboda 360
 
3471 svoboda 361
    LOG("udebog_stop/done\n");
2898 svoboda 362
    return 0;
363
}
364
 
3471 svoboda 365
/** Read the list of userspace threads in the current task.
366
 *
367
 * The list takes the form of a sequence of thread hashes (i.e. the pointers
368
 * to thread structures). A buffer of size @a buf_size is allocated and
369
 * a pointer to it written to @a buffer. The sequence of hashes is written
370
 * into this buffer.
371
 *
372
 * If the sequence is longer than @a buf_size bytes, only as much hashes
373
 * as can fit are copied. The number of thread hashes copied is stored
374
 * in @a n.
375
 *
376
 * The rationale for having @a buf_size is that this function is only
377
 * used for servicing the THREAD_READ message, which always specifies
378
 * a maximum size for the userspace buffer.
379
 *
380
 * @param buffer    The buffer for storing thread hashes.
381
 * @param buf_size  Buffer size in bytes.
382
 * @param n     The actual number of hashes copied will be stored here.
383
 */
2897 svoboda 384
int udebug_thread_read(void **buffer, size_t buf_size, size_t *n)
2887 svoboda 385
{
386
    thread_t *t;
387
    link_t *cur;
388
    unative_t tid;
2897 svoboda 389
    unsigned copied_ids;
2887 svoboda 390
    ipl_t ipl;
391
    unative_t *id_buffer;
392
    int flags;
2897 svoboda 393
    size_t max_ids;
2887 svoboda 394
 
3471 svoboda 395
    LOG("udebug_thread_read()\n");
2887 svoboda 396
 
2897 svoboda 397
    /* Allocate a buffer to hold thread IDs */
398
    id_buffer = malloc(buf_size, 0);
399
 
3016 svoboda 400
    mutex_lock(&TASK->udebug.lock);
2887 svoboda 401
 
402
    /* Verify task state */
3014 svoboda 403
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
3016 svoboda 404
        mutex_unlock(&TASK->udebug.lock);
2887 svoboda 405
        return EINVAL;
406
    }
407
 
3016 svoboda 408
    ipl = interrupts_disable();
409
    spinlock_lock(&TASK->lock);
2897 svoboda 410
    /* Copy down the thread IDs */
2887 svoboda 411
 
2897 svoboda 412
    max_ids = buf_size / sizeof(unative_t);
413
    copied_ids = 0;
414
 
3026 svoboda 415
    /* FIXME: make sure the thread isn't past debug shutdown... */
2887 svoboda 416
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
2897 svoboda 417
        /* Do not write past end of buffer */
418
        if (copied_ids >= max_ids) break;
2887 svoboda 419
 
420
        t = list_get_instance(cur, thread_t, th_link);
421
 
422
        spinlock_lock(&t->lock);
423
        flags = t->flags;
424
        spinlock_unlock(&t->lock);
425
 
3606 svoboda 426
        /* Not interested in kernel threads. */
2887 svoboda 427
        if ((flags & THREAD_FLAG_USPACE) != 0) {
2897 svoboda 428
            /* Using thread struct pointer as identification hash */
2887 svoboda 429
            tid = (unative_t) t;
430
            id_buffer[copied_ids++] = tid;
431
        }
432
    }
433
 
434
    spinlock_unlock(&TASK->lock);
435
    interrupts_restore(ipl);
436
 
3016 svoboda 437
    mutex_unlock(&TASK->udebug.lock);
438
 
2887 svoboda 439
    *buffer = id_buffer;
440
    *n = copied_ids * sizeof(unative_t);
441
 
442
    return 0;
443
}
444
 
3471 svoboda 445
/** Read the arguments of a system call.
446
 *
447
 * The arguments of the system call being being executed are copied
448
 * to an allocated buffer and a pointer to it is written to @a buffer.
449
 * The size of the buffer is exactly such that it can hold the maximum number
450
 * of system-call arguments.
451
 *
452
 * Unless the thread is currently blocked in a SYSCALL_B or SYSCALL_E event,
453
 * this function will fail with an EINVAL error code.
454
 *
455
 * @param buffer    The buffer for storing thread hashes.
456
 */
2887 svoboda 457
int udebug_args_read(thread_t *t, void **buffer)
458
{
459
    int rc;
460
    unative_t *arg_buffer;
461
 
3606 svoboda 462
    /* Prepare a buffer to hold the arguments. */
2896 svoboda 463
    arg_buffer = malloc(6 * sizeof(unative_t), 0);
464
 
3606 svoboda 465
    /* On success, this will lock t->udebug.lock. */
2898 svoboda 466
    rc = _thread_op_begin(t, false);
2887 svoboda 467
    if (rc != EOK) {
468
        return rc;
469
    }
470
 
3606 svoboda 471
    /* Additionally we need to verify that we are inside a syscall. */
3018 svoboda 472
    if (t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_B &&
473
        t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_E) {
2887 svoboda 474
        _thread_op_end(t);
475
        return EINVAL;
476
    }
477
 
3606 svoboda 478
    /* Copy to a local buffer before releasing the lock. */
3018 svoboda 479
    memcpy(arg_buffer, t->udebug.syscall_args, 6 * sizeof(unative_t));
2887 svoboda 480
 
481
    _thread_op_end(t);
482
 
483
    *buffer = arg_buffer;
484
    return 0;
485
}
486
 
2919 svoboda 487
int udebug_regs_read(thread_t *t, void *buffer)
2887 svoboda 488
{
489
    istate_t *state;
490
    int rc;
491
 
3424 svoboda 492
//  printf("udebug_regs_read()\n");
2887 svoboda 493
 
3018 svoboda 494
    /* On success, this will lock t->udebug.lock */
2898 svoboda 495
    rc = _thread_op_begin(t, false);
2887 svoboda 496
    if (rc != EOK) {
497
        return rc;
498
    }
499
 
3018 svoboda 500
    state = t->udebug.uspace_state;
2887 svoboda 501
    if (state == NULL) {
502
        _thread_op_end(t);
3611 svoboda 503
        LOG("udebug_regs_read() - istate not available\n");
2887 svoboda 504
        return EBUSY;
505
    }
506
 
2896 svoboda 507
    /* Copy to the allocated buffer */
2919 svoboda 508
    memcpy(buffer, state, sizeof(istate_t));
2887 svoboda 509
 
510
    _thread_op_end(t);
511
 
512
    return 0;
513
}
514
 
515
int udebug_regs_write(thread_t *t, void *buffer)
516
{
517
    int rc;
518
    istate_t *state;
519
 
3611 svoboda 520
    LOG("udebug_regs_write()\n");
2887 svoboda 521
 
522
    /* Try to change the thread's uspace_state */
523
 
3018 svoboda 524
    /* On success, this will lock t->udebug.lock */
2898 svoboda 525
    rc = _thread_op_begin(t, false);
2887 svoboda 526
    if (rc != EOK) {
3611 svoboda 527
        LOG("error locking thread\n");
2887 svoboda 528
        return rc;
529
    }
530
 
3018 svoboda 531
    state = t->udebug.uspace_state;
2887 svoboda 532
    if (state == NULL) {
533
        _thread_op_end(t);
3611 svoboda 534
        LOG("udebug_regs_write() - istate not available\n");
2887 svoboda 535
        return EBUSY;
536
    }
537
 
3018 svoboda 538
    memcpy(t->udebug.uspace_state, buffer, sizeof(istate_t));
2887 svoboda 539
 
540
    _thread_op_end(t);
541
 
542
    return 0;
543
}
544
 
3471 svoboda 545
/** Read the memory of the debugged task.
546
 *
547
 * Reads @a n bytes from the address space of the debugged task, starting
548
 * from @a uspace_addr. The bytes are copied into an allocated buffer
549
 * and a pointer to it is written into @a buffer.
550
 *
551
 * @param uspace_addr   Address from where to start reading.
552
 * @param n     Number of bytes to read.
553
 * @param buffer    For storing a pointer to the allocated buffer.
554
 */
2887 svoboda 555
int udebug_mem_read(unative_t uspace_addr, size_t n, void **buffer)
556
{
557
    void *data_buffer;
558
    int rc;
559
 
3016 svoboda 560
    /* Verify task state */
561
    mutex_lock(&TASK->udebug.lock);
2887 svoboda 562
 
3016 svoboda 563
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
564
        mutex_unlock(&TASK->udebug.lock);
565
        return EBUSY;
566
    }
567
 
2896 svoboda 568
    data_buffer = malloc(n, 0);
569
 
2887 svoboda 570
    /* NOTE: this is not strictly from a syscall... but that shouldn't
571
     * be a problem */
572
    rc = copy_from_uspace(data_buffer, (void *)uspace_addr, n);
3016 svoboda 573
    mutex_unlock(&TASK->udebug.lock);
2887 svoboda 574
 
3016 svoboda 575
    if (rc != 0) return rc;
576
 
2887 svoboda 577
    *buffer = data_buffer;
578
    return 0;
579
}
580
 
581
int udebug_mem_write(unative_t uspace_addr, void *data, size_t n)
582
{
583
    int rc;
584
 
3611 svoboda 585
    LOG("udebug_mem_write()\n");
2887 svoboda 586
 
3127 svoboda 587
    /* n must be positive */
588
    if (n < 1)
589
        return EINVAL;
590
 
2887 svoboda 591
    /* Verify task state */
3016 svoboda 592
    mutex_lock(&TASK->udebug.lock);
2887 svoboda 593
 
3016 svoboda 594
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
595
        mutex_unlock(&TASK->udebug.lock);
2887 svoboda 596
        return EBUSY;
3016 svoboda 597
    }
2887 svoboda 598
 
3611 svoboda 599
    LOG("dst=%u, size=%u\n", uspace_addr, n);
2887 svoboda 600
 
601
    /* NOTE: this is not strictly from a syscall... but that shouldn't
602
     * be a problem */
3013 svoboda 603
//  rc = copy_to_uspace((void *)uspace_addr, data, n);
604
//  if (rc) return rc;
2887 svoboda 605
 
3013 svoboda 606
    rc = as_debug_write(uspace_addr, data, n);
3127 svoboda 607
 
3611 svoboda 608
    LOG("rc=%d\n", rc);
3013 svoboda 609
 
3016 svoboda 610
    mutex_unlock(&TASK->udebug.lock);
611
 
3013 svoboda 612
    return rc;
2887 svoboda 613
}
614
 
615
/** @}
616
 */