WebSVN – HelenOS – Diff – //branches/tracing/kernel/generic/src/udebug/udebug_ops.c



#include <udebug/udebug_ops.h>
 
/**
 * Prepare a thread for a debugging operation.
 *
 * Simply put, return thread t with t->udebug.lock held,
 * but only if it verifies all conditions.
 *
 * Specifically, verifies that thread t exists, is a userspace thread,
 * and belongs to the current task (TASK). Verifies, that the thread
 * has (or hasn't) go according to having_go (typically false).
 * It also locks t->udebug.lock, making sure that t->udebug.debug_active is true
 * - that the thread is in a valid debugging session.
 *
 * Returns EOK if all went well, or an error code otherwise.
 * Interrupts must be already disabled when calling this function.
 *

    if (!thread_exists(t)) {
        spinlock_unlock(&threads_lock);
        return ENOENT;
    }
 
    spinlock_lock(&t->udebug.lock);
    spinlock_lock(&t->lock);
   
    /* Now verify that it's the current task */
    if (t->task != TASK) {
        /* No such thread belonging to callee */

        /* It's not, deny its existence */
        rc = ENOENT;
        goto error_exit;
    }
 
    if ((t->udebug.debug_active != true) || (!t->udebug.stop != having_go)) {
        /* Not in debugging session or undesired GO state */
        rc = EINVAL;
        goto error_exit;
    }
 
    spinlock_unlock(&threads_lock);
    spinlock_unlock(&t->lock);
 
    /* Only t->udebug.lock left */
 
    return EOK; /* All went well */
 
 
    /* Executed when a check on the thread fails */
error_exit:
    spinlock_unlock(&t->lock);
    spinlock_unlock(&t->udebug.lock);
    spinlock_unlock(&threads_lock);
 
    /* No locks left here */
    return rc;  /* Some errors occured */
}
 
 
static void _thread_op_end(thread_t *t)
{
    spinlock_unlock(&t->udebug.lock);
}
 
/**
 * \return 0 (ok, but not done yet), 1 (done) or negative error code.
 */

        reply = 1; /* immediate reply */
    } else {
        reply = 0; /* no reply */
    }
   
    /* Set udebug.debug_active on all of the task's userspace threads */
 
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
        t = list_get_instance(cur, thread_t, th_link);
 
        ipl = interrupts_disable();
        spinlock_lock(&t->udebug.lock);
        if ((t->flags & THREAD_FLAG_USPACE) != 0)
            t->udebug.debug_active = true;
        spinlock_unlock(&t->udebug.lock);
        interrupts_restore(ipl);
    }
 
    mutex_unlock(&TASK->udebug.lock);
 

 
//  klog_printf("udebug_go()");
 
    ipl = interrupts_disable();
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        interrupts_restore(ipl);
        return rc;
    }
 
    t->udebug.go_call = call;
    t->udebug.stop = false;
    t->udebug.cur_event = 0;    /* none */
 
    /*
     * Neither t's lock nor threads_lock may be held during wakeup
     */
    waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST);
 
    _thread_op_end(t);
    interrupts_restore(ipl);
 
    return 0;

    mutex_lock(&TASK->udebug.lock);
 
    ipl = interrupts_disable();
 
    /*
     * On success, this will lock t->udebug.lock. Note that this makes sure
     * the thread is not stopped.
     */
    rc = _thread_op_begin(t, true);
    if (rc != EOK) {
        interrupts_restore(ipl);
        return rc;
    }
 
    /* Take GO away from the thread */
    t->udebug.stop = true;
 
    if (!t->udebug.stoppable) {
        /* Answer will be sent when the thread becomes stoppable */
        _thread_op_end(t);
        interrupts_restore(ipl);
        return 0;
    }

     * Answer GO call
     */
    klog_printf("udebug_stop - answering go call");
 
    /* Make sure nobody takes this call away from us */
    call = t->udebug.go_call;
    t->udebug.go_call = NULL;
 
    IPC_SET_RETVAL(call->data, 0);
    IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);
    klog_printf("udebug_stop/ipc_answer");
 
    THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;
 
    _thread_op_end(t);
    interrupts_restore(ipl);
 
    ipc_answer(&TASK->answerbox, call);

    /* Prepare a buffer to hold the arguments */
    arg_buffer = malloc(6 * sizeof(unative_t), 0);
 
    ipl = interrupts_disable();
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        interrupts_restore(ipl);
        return rc;
    }
 
    /* Additionally we need to verify that we are inside a syscall */
    if (t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_B &&
        t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_E) {
        _thread_op_end(t);
        interrupts_restore(ipl);
 
        return EINVAL;
    }
 
    /* Copy to a local buffer before releasing the lock */
    memcpy(arg_buffer, t->udebug.syscall_args, 6 * sizeof(unative_t));
 
    _thread_op_end(t);
    interrupts_restore(ipl);
 
    *buffer = arg_buffer;

 
    klog_printf("udebug_regs_read()");
 
    ipl = interrupts_disable();
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        interrupts_restore(ipl);
        return rc;
    }
 
    state = t->udebug.uspace_state;
    if (state == NULL) {
        _thread_op_end(t);
        interrupts_restore(ipl);
        klog_printf("udebug_regs_read() - istate not available");
        return EBUSY;

 
    /* Try to change the thread's uspace_state */
 
    ipl = interrupts_disable();
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        klog_printf("error locking thread");
        interrupts_restore(ipl);
        return rc;
    }
 
    state = t->udebug.uspace_state;
    if (state == NULL) {
        _thread_op_end(t);
        interrupts_restore(ipl);
        klog_printf("udebug_regs_write() - istate not available");
 
        return EBUSY;
    }
 
    memcpy(t->udebug.uspace_state, buffer, sizeof(istate_t));
 
    _thread_op_end(t);
    interrupts_restore(ipl);
 
    return 0;

Rev 3016	Rev 3018
Line 46...	Line 46...
46	#include <udebug/udebug_ops.h>	46	#include <udebug/udebug_ops.h>
47		47
48	/**	48	/**
49	* Prepare a thread for a debugging operation.	49	* Prepare a thread for a debugging operation.
50	*	50	*
51	* Simply put, return thread t with t->debug_lock held,	51	* Simply put, return thread t with t->udebug.lock held,
52	* but only if it verifies all conditions.	52	* but only if it verifies all conditions.
53	*	53	*
54	* Specifically, verifies that thread t exists, is a userspace thread,	54	* Specifically, verifies that thread t exists, is a userspace thread,
55	* and belongs to the current task (TASK). Verifies, that the thread	55	* and belongs to the current task (TASK). Verifies, that the thread
56	* has (or hasn't) go according to having_go (typically false).	56	* has (or hasn't) go according to having_go (typically false).
57	* It also locks t->debug_lock, making sure that t->debug_active is true	57	* It also locks t->udebug.lock, making sure that t->udebug.debug_active is true
58	* - that the thread is in a valid debugging session.	58	* - that the thread is in a valid debugging session.
59	*	59	*
60	* Returns EOK if all went well, or an error code otherwise.	60	* Returns EOK if all went well, or an error code otherwise.
61	* Interrupts must be already disabled when calling this function.	61	* Interrupts must be already disabled when calling this function.
62	*	62	*
Line 75...	Line 75...
75	if (!thread_exists(t)) {	75	if (!thread_exists(t)) {
76	spinlock_unlock(&threads_lock);	76	spinlock_unlock(&threads_lock);
77	return ENOENT;	77	return ENOENT;
78	}	78	}
79		79
80	spinlock_lock(&t->debug_lock);	80	spinlock_lock(&t->udebug.lock);
81	spinlock_lock(&t->lock);	81	spinlock_lock(&t->lock);
82		82
83	/* Now verify that it's the current task */	83	/* Now verify that it's the current task */
84	if (t->task != TASK) {	84	if (t->task != TASK) {
85	/* No such thread belonging to callee */	85	/* No such thread belonging to callee */
Line 92...	Line 92...
92	/* It's not, deny its existence */	92	/* It's not, deny its existence */
93	rc = ENOENT;	93	rc = ENOENT;
94	goto error_exit;	94	goto error_exit;
95	}	95	}
96		96
97	if ((t->debug_active != true) \|\| (!t->debug_stop != having_go)) {	97	if ((t->udebug.debug_active != true) \|\| (!t->udebug.stop != having_go)) {
98	/* Not in debugging session or undesired GO state */	98	/* Not in debugging session or undesired GO state */
99	rc = EINVAL;	99	rc = EINVAL;
100	goto error_exit;	100	goto error_exit;
101	}	101	}
102		102
103	spinlock_unlock(&threads_lock);	103	spinlock_unlock(&threads_lock);
104	spinlock_unlock(&t->lock);	104	spinlock_unlock(&t->lock);
105		105
106	/* Only t->debug_lock left */	106	/* Only t->udebug.lock left */
107		107
108	return EOK; /* All went well */	108	return EOK; /* All went well */
109		109
110		110
111	/* Executed when a check on the thread fails */	111	/* Executed when a check on the thread fails */
112	error_exit:	112	error_exit:
113	spinlock_unlock(&t->lock);	113	spinlock_unlock(&t->lock);
114	spinlock_unlock(&t->debug_lock);	114	spinlock_unlock(&t->udebug.lock);
115	spinlock_unlock(&threads_lock);	115	spinlock_unlock(&threads_lock);
116		116
117	/* No locks left here */	117	/* No locks left here */
118	return rc; /* Some errors occured */	118	return rc; /* Some errors occured */
119	}	119	}
120		120
121		121
122	static void _thread_op_end(thread_t *t)	122	static void _thread_op_end(thread_t *t)
123	{	123	{
124	spinlock_unlock(&t->debug_lock);	124	spinlock_unlock(&t->udebug.lock);
125	}	125	}
126		126
127	/**	127	/**
128	* \return 0 (ok, but not done yet), 1 (done) or negative error code.	128	* \return 0 (ok, but not done yet), 1 (done) or negative error code.
129	*/	129	*/
Line 157...	Line 157...
157	reply = 1; /* immediate reply */	157	reply = 1; /* immediate reply */
158	} else {	158	} else {
159	reply = 0; /* no reply */	159	reply = 0; /* no reply */
160	}	160	}
161		161
162	/* Set debug_active on all of the task's userspace threads */	162	/* Set udebug.debug_active on all of the task's userspace threads */
163		163
164	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {	164	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
165	t = list_get_instance(cur, thread_t, th_link);	165	t = list_get_instance(cur, thread_t, th_link);
166		166
167	ipl = interrupts_disable();	167	ipl = interrupts_disable();
168	spinlock_lock(&t->debug_lock);	168	spinlock_lock(&t->udebug.lock);
169	if ((t->flags & THREAD_FLAG_USPACE) != 0)	169	if ((t->flags & THREAD_FLAG_USPACE) != 0)
170	t->debug_active = true;	170	t->udebug.debug_active = true;
171	spinlock_unlock(&t->debug_lock);	171	spinlock_unlock(&t->udebug.lock);
172	interrupts_restore(ipl);	172	interrupts_restore(ipl);
173	}	173	}
174		174
175	mutex_unlock(&TASK->udebug.lock);	175	mutex_unlock(&TASK->udebug.lock);
176		176
Line 226...	Line 226...
226		226
227	// klog_printf("udebug_go()");	227	// klog_printf("udebug_go()");
228		228
229	ipl = interrupts_disable();	229	ipl = interrupts_disable();
230		230
231	/* On success, this will lock t->debug_lock */	231	/* On success, this will lock t->udebug.lock */
232	rc = _thread_op_begin(t, false);	232	rc = _thread_op_begin(t, false);
233	if (rc != EOK) {	233	if (rc != EOK) {
234	interrupts_restore(ipl);	234	interrupts_restore(ipl);
235	return rc;	235	return rc;
236	}	236	}
237		237
238	t->debug_go_call = call;	238	t->udebug.go_call = call;
239	t->debug_stop = false;	239	t->udebug.stop = false;
240	t->cur_event = 0; /* none */	240	t->udebug.cur_event = 0; /* none */
241		241
242	/*	242	/*
243	* Neither t's lock nor threads_lock may be held during wakeup	243	* Neither t's lock nor threads_lock may be held during wakeup
244	*/	244	*/
245	waitq_wakeup(&t->go_wq, WAKEUP_FIRST);	245	waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST);
246		246
247	_thread_op_end(t);	247	_thread_op_end(t);
248	interrupts_restore(ipl);	248	interrupts_restore(ipl);
249		249
250	return 0;	250	return 0;
Line 259...	Line 259...
259	mutex_lock(&TASK->udebug.lock);	259	mutex_lock(&TASK->udebug.lock);
260		260
261	ipl = interrupts_disable();	261	ipl = interrupts_disable();
262		262
263	/*	263	/*
264	* On success, this will lock t->debug_lock. Note that this makes sure	264	* On success, this will lock t->udebug.lock. Note that this makes sure
265	* the thread is not stopped.	265	* the thread is not stopped.
266	*/	266	*/
267	rc = _thread_op_begin(t, true);	267	rc = _thread_op_begin(t, true);
268	if (rc != EOK) {	268	if (rc != EOK) {
269	interrupts_restore(ipl);	269	interrupts_restore(ipl);
270	return rc;	270	return rc;
271	}	271	}
272		272
273	/* Take GO away from the thread */	273	/* Take GO away from the thread */
274	t->debug_stop = true;	274	t->udebug.stop = true;
275		275
276	if (!t->debug_stoppable) {	276	if (!t->udebug.stoppable) {
277	/* Answer will be sent when the thread becomes stoppable */	277	/* Answer will be sent when the thread becomes stoppable */
278	_thread_op_end(t);	278	_thread_op_end(t);
279	interrupts_restore(ipl);	279	interrupts_restore(ipl);
280	return 0;	280	return 0;
281	}	281	}
Line 284...	Line 284...
284	* Answer GO call	284	* Answer GO call
285	*/	285	*/
286	klog_printf("udebug_stop - answering go call");	286	klog_printf("udebug_stop - answering go call");
287		287
288	/* Make sure nobody takes this call away from us */	288	/* Make sure nobody takes this call away from us */
289	call = t->debug_go_call;	289	call = t->udebug.go_call;
290	t->debug_go_call = NULL;	290	t->udebug.go_call = NULL;
291		291
292	IPC_SET_RETVAL(call->data, 0);	292	IPC_SET_RETVAL(call->data, 0);
293	IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);	293	IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);
294	klog_printf("udebug_stop/ipc_answer");	294	klog_printf("udebug_stop/ipc_answer");
295		295
296	THREAD->cur_event = UDEBUG_EVENT_STOP;	296	THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;
297		297
298	_thread_op_end(t);	298	_thread_op_end(t);
299	interrupts_restore(ipl);	299	interrupts_restore(ipl);
300		300
301	ipc_answer(&TASK->answerbox, call);	301	ipc_answer(&TASK->answerbox, call);
Line 376...	Line 376...
376	/* Prepare a buffer to hold the arguments */	376	/* Prepare a buffer to hold the arguments */
377	arg_buffer = malloc(6 * sizeof(unative_t), 0);	377	arg_buffer = malloc(6 * sizeof(unative_t), 0);
378		378
379	ipl = interrupts_disable();	379	ipl = interrupts_disable();
380		380
381	/* On success, this will lock t->debug_lock */	381	/* On success, this will lock t->udebug.lock */
382	rc = _thread_op_begin(t, false);	382	rc = _thread_op_begin(t, false);
383	if (rc != EOK) {	383	if (rc != EOK) {
384	interrupts_restore(ipl);	384	interrupts_restore(ipl);
385	return rc;	385	return rc;
386	}	386	}
387		387
388	/* Additionally we need to verify that we are inside a syscall */	388	/* Additionally we need to verify that we are inside a syscall */
389	if (t->cur_event != UDEBUG_EVENT_SYSCALL_B &&	389	if (t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_B &&
390	t->cur_event != UDEBUG_EVENT_SYSCALL_E) {	390	t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_E) {
391	_thread_op_end(t);	391	_thread_op_end(t);
392	interrupts_restore(ipl);	392	interrupts_restore(ipl);
393		393
394	return EINVAL;	394	return EINVAL;
395	}	395	}
396		396
397	/* Copy to a local buffer before releasing the lock */	397	/* Copy to a local buffer before releasing the lock */
398	memcpy(arg_buffer, t->syscall_args, 6 * sizeof(unative_t));	398	memcpy(arg_buffer, t->udebug.syscall_args, 6 * sizeof(unative_t));
399		399
400	_thread_op_end(t);	400	_thread_op_end(t);
401	interrupts_restore(ipl);	401	interrupts_restore(ipl);
402		402
403	*buffer = arg_buffer;	403	*buffer = arg_buffer;
Line 412...	Line 412...
412		412
413	klog_printf("udebug_regs_read()");	413	klog_printf("udebug_regs_read()");
414		414
415	ipl = interrupts_disable();	415	ipl = interrupts_disable();
416		416
417	/* On success, this will lock t->debug_lock */	417	/* On success, this will lock t->udebug.lock */
418	rc = _thread_op_begin(t, false);	418	rc = _thread_op_begin(t, false);
419	if (rc != EOK) {	419	if (rc != EOK) {
420	interrupts_restore(ipl);	420	interrupts_restore(ipl);
421	return rc;	421	return rc;
422	}	422	}
423		423
424	state = t->uspace_state;	424	state = t->udebug.uspace_state;
425	if (state == NULL) {	425	if (state == NULL) {
426	_thread_op_end(t);	426	_thread_op_end(t);
427	interrupts_restore(ipl);	427	interrupts_restore(ipl);
428	klog_printf("udebug_regs_read() - istate not available");	428	klog_printf("udebug_regs_read() - istate not available");
429	return EBUSY;	429	return EBUSY;
Line 448...	Line 448...
448		448
449	/* Try to change the thread's uspace_state */	449	/* Try to change the thread's uspace_state */
450		450
451	ipl = interrupts_disable();	451	ipl = interrupts_disable();
452		452
453	/* On success, this will lock t->debug_lock */	453	/* On success, this will lock t->udebug.lock */
454	rc = _thread_op_begin(t, false);	454	rc = _thread_op_begin(t, false);
455	if (rc != EOK) {	455	if (rc != EOK) {
456	klog_printf("error locking thread");	456	klog_printf("error locking thread");
457	interrupts_restore(ipl);	457	interrupts_restore(ipl);
458	return rc;	458	return rc;
459	}	459	}
460		460
461	state = t->uspace_state;	461	state = t->udebug.uspace_state;
462	if (state == NULL) {	462	if (state == NULL) {
463	_thread_op_end(t);	463	_thread_op_end(t);
464	interrupts_restore(ipl);	464	interrupts_restore(ipl);
465	klog_printf("udebug_regs_write() - istate not available");	465	klog_printf("udebug_regs_write() - istate not available");
466		466
467	return EBUSY;	467	return EBUSY;
468	}	468	}
469		469
470	memcpy(t->uspace_state, buffer, sizeof(istate_t));	470	memcpy(t->udebug.uspace_state, buffer, sizeof(istate_t));
471		471
472	_thread_op_end(t);	472	_thread_op_end(t);
473	interrupts_restore(ipl);	473	interrupts_restore(ipl);
474		474
475	return 0;	475	return 0;

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(root)//branches/tracing/kernel/generic/src/udebug/udebug_ops.c – Rev 3016 → 3018