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


/*
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup generic
 * @{
 */
 
/**
 * @file
 * @brief   Udebug operations.
 */
 
#include <debug.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <arch.h>
#include <errno.h>
#include <syscall/copy.h>
#include <ipc/ipc.h>
#include <udebug/udebug.h>
#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.
 *
 * With this verified and the t->udebug.lock mutex held, it is ensured
 * that the thread cannot leave the debugging session, let alone cease
 * to exist.
 *
 * In this function, holding the TASK->udebug.lock mutex prevents the
 * thread from leaving the debugging session, while relaxing from
 * the t->lock spinlock to the t->udebug.lock mutex.
 *
 * Returns EOK if all went well, or an error code otherwise.
 */
static int _thread_op_begin(thread_t *t, bool having_go)
{
    task_id_t taskid;
    ipl_t ipl;
 
    taskid = TASK->taskid;
 
    mutex_lock(&TASK->udebug.lock);
 
    /* thread_exists() must be called with threads_lock held */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
 
    if (!thread_exists(t)) {
        spinlock_unlock(&threads_lock);
        interrupts_restore(ipl);
        mutex_unlock(&TASK->udebug.lock);
        return ENOENT;
    }
 
    /* t->lock is enough to ensure the thread's existence */
    spinlock_lock(&t->lock);
    spinlock_unlock(&threads_lock);
 
    /* Verify that 't' is a userspace thread */
    if ((t->flags & THREAD_FLAG_USPACE) == 0) {
        /* It's not, deny its existence */
        spinlock_unlock(&t->lock);
        interrupts_restore(ipl);
        mutex_unlock(&TASK->udebug.lock);
        return ENOENT;
    }
 
    /* Verify debugging state */
    if (t->udebug.debug_active != true) {
        /* Not in debugging session or undesired GO state */
        spinlock_unlock(&t->lock);
        interrupts_restore(ipl);
        mutex_unlock(&TASK->udebug.lock);
        return ENOENT;
    }
 
    /*
     * Since the thread has debug_active == true, TASK->udebug.lock
     * is enough to ensure its existence and that debug_active remains
     * true.
     */
    spinlock_unlock(&t->lock);
    interrupts_restore(ipl);
 
    /* Only mutex TASK->udebug.lock left */
   
    /* Now verify that the thread belongs to the current task */
    if (t->task != TASK) {
        /* No such thread belonging this task*/
        mutex_unlock(&TASK->udebug.lock);
        return ENOENT;
    }
 
    /*
     * Now we need to grab the thread's debug lock for synchronization
     * of the threads stoppability/stop state.
     */
    mutex_lock(&t->udebug.lock);
 
    /* The big task mutex is no longer needed */
    mutex_unlock(&TASK->udebug.lock);
 
    if (!t->udebug.stop != having_go) {
        /* Not in debugging session or undesired GO state */
        mutex_unlock(&t->udebug.lock);
        return EINVAL;
    }
 
    /* Only t->udebug.lock left */
 
    return EOK; /* All went well */
}
 
 
static void _thread_op_end(thread_t *t)
{
    mutex_unlock(&t->udebug.lock);
}
 
/**
 * \return 0 (ok, but not done yet), 1 (done) or negative error code.
 */
int udebug_begin(call_t *call)
{
    int reply;
 
    thread_t *t;
    link_t *cur;
 
    LOG("udebug_begin()\n");
 
    mutex_lock(&TASK->udebug.lock);
    LOG("debugging task %llu\n", TASK->taskid);
 
    if (TASK->udebug.dt_state != UDEBUG_TS_INACTIVE) {
        mutex_unlock(&TASK->udebug.lock);
        LOG("udebug_begin(): busy error\n");
 
        return EBUSY;
    }
 
    TASK->udebug.dt_state = UDEBUG_TS_BEGINNING;
    TASK->udebug.begin_call = call;
    TASK->udebug.debugger = call->sender;
 
    if (TASK->udebug.not_stoppable_count == 0) {
        TASK->udebug.dt_state = UDEBUG_TS_ACTIVE;
        TASK->udebug.begin_call = NULL;
        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);
 
        mutex_lock(&t->udebug.lock);
        if ((t->flags & THREAD_FLAG_USPACE) != 0)
            t->udebug.debug_active = true;
        mutex_unlock(&t->udebug.lock);
    }
 
    mutex_unlock(&TASK->udebug.lock);
 
    LOG("udebug_begin() done (%s)\n",
        reply ? "reply" : "stoppability wait");
 
    return reply;
}
 
int udebug_end(void)
{
    int rc;
 
    LOG("udebug_end()\n");
 
    mutex_lock(&TASK->udebug.lock);
    LOG("task %" PRIu64 "\n", TASK->taskid);
 
    rc = udebug_task_cleanup(TASK);
 
    mutex_unlock(&TASK->udebug.lock);
 
    return rc;
}
 
int udebug_set_evmask(udebug_evmask_t mask)
{
    LOG("udebug_set_mask()\n");
 
 
 
    mutex_lock(&TASK->udebug.lock);
 
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
        mutex_unlock(&TASK->udebug.lock);
        LOG("udebug_set_mask(): not active debuging session\n");
 
        return EINVAL;
    }
 
    TASK->udebug.evmask = mask;
 
    mutex_unlock(&TASK->udebug.lock);
 
    return 0;
}
 
 
int udebug_go(thread_t *t, call_t *call)
{
    int rc;
 
 
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        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);
 
    return 0;
}
 
int udebug_stop(thread_t *t, call_t *call)
{
    int rc;
 
    LOG("udebug_stop()\n");
    mutex_lock(&TASK->udebug.lock);
 
    /*
     * 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) {
        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);
        return 0;
    }
 
    /*
     * Answer GO call
     */
    LOG("udebug_stop - answering go call\n");
 
    /* 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);
    LOG("udebug_stop/ipc_answer\n");
 
    THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;
 
    _thread_op_end(t);
 
    ipc_answer(&TASK->answerbox, call);
    mutex_unlock(&TASK->udebug.lock);
 
    LOG("udebog_stop/done\n");
    return 0;
}
 
int udebug_thread_read(void **buffer, size_t buf_size, size_t *n)
{
    thread_t *t;
    link_t *cur;
    unative_t tid;
    unsigned copied_ids;
    ipl_t ipl;
    unative_t *id_buffer;
    int flags;
    size_t max_ids;
 
    LOG("udebug_thread_read()\n");
 
    /* Allocate a buffer to hold thread IDs */
    id_buffer = malloc(buf_size, 0);
 
    mutex_lock(&TASK->udebug.lock);
 
    /* Verify task state */
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
        mutex_unlock(&TASK->udebug.lock);
        return EINVAL;
    }
 
    ipl = interrupts_disable();
    spinlock_lock(&TASK->lock);
    /* Copy down the thread IDs */
 
    max_ids = buf_size / sizeof(unative_t);
    copied_ids = 0;
 
    /* FIXME: make sure the thread isn't past debug shutdown... */
    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
        /* Do not write past end of buffer */
        if (copied_ids >= max_ids) break;
 
        t = list_get_instance(cur, thread_t, th_link);
 
        spinlock_lock(&t->lock);
        flags = t->flags;
        spinlock_unlock(&t->lock);
 
        /* Not interested in kernel threads */
        if ((flags & THREAD_FLAG_USPACE) != 0) {
            /* Using thread struct pointer as identification hash */
            tid = (unative_t) t;
            id_buffer[copied_ids++] = tid;
        }
    }
 
    spinlock_unlock(&TASK->lock);
    interrupts_restore(ipl);
 
    mutex_unlock(&TASK->udebug.lock);
 
    *buffer = id_buffer;
    *n = copied_ids * sizeof(unative_t);
 
    return 0;
}
 
int udebug_args_read(thread_t *t, void **buffer)
{
    int rc;
    unative_t *arg_buffer;
 
 
 
    /* Prepare a buffer to hold the arguments */
    arg_buffer = malloc(6 * sizeof(unative_t), 0);
 
    /* On success, this will lock t->udebug.lock */
    rc = _thread_op_begin(t, false);
    if (rc != EOK) {
        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);
        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);
 
    *buffer = arg_buffer;
    return 0;
}
 
int udebug_mem_read(unative_t uspace_addr, size_t n, void **buffer)
{
    void *data_buffer;
    int rc;
 
    /* Verify task state */
    mutex_lock(&TASK->udebug.lock);
 
    if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
        mutex_unlock(&TASK->udebug.lock);
        return EBUSY;
    }
 
    data_buffer = malloc(n, 0);
 
 
 
    /* NOTE: this is not strictly from a syscall... but that shouldn't
     * be a problem */
    rc = copy_from_uspace(data_buffer, (void *)uspace_addr, n);
    mutex_unlock(&TASK->udebug.lock);
 
    if (rc != 0) return rc;
 
    *buffer = data_buffer;
    return 0;
}
 
/** @}
 */
 

Rev 3438	Rev 3441
1	/*	1	/*
2	* Copyright (c) 2008 Jiri Svoboda	2	* Copyright (c) 2008 Jiri Svoboda
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup generic	29	/** @addtogroup generic
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Udebug operations.	35	* @brief Udebug operations.
36	*/	36	*/
37		37
38	#include <print.h>	38	#include <debug.h>
39	#include <proc/task.h>	39	#include <proc/task.h>
40	#include <proc/thread.h>	40	#include <proc/thread.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <errno.h>	42	#include <errno.h>
43	#include <syscall/copy.h>	43	#include <syscall/copy.h>
44	#include <ipc/ipc.h>	44	#include <ipc/ipc.h>
45	#include <udebug/udebug.h>	45	#include <udebug/udebug.h>
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->udebug.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->udebug.lock, making sure that t->udebug.debug_active	57	* It also locks t->udebug.lock, making sure that t->udebug.debug_active
58	* is true - that the thread is in a valid debugging session.	58	* is true - that the thread is in a valid debugging session.
59	*	59	*
60	* With this verified and the t->udebug.lock mutex held, it is ensured	60	* With this verified and the t->udebug.lock mutex held, it is ensured
61	* that the thread cannot leave the debugging session, let alone cease	61	* that the thread cannot leave the debugging session, let alone cease
62	* to exist.	62	* to exist.
63	*	63	*
64	* In this function, holding the TASK->udebug.lock mutex prevents the	64	* In this function, holding the TASK->udebug.lock mutex prevents the
65	* thread from leaving the debugging session, while relaxing from	65	* thread from leaving the debugging session, while relaxing from
66	* the t->lock spinlock to the t->udebug.lock mutex.	66	* the t->lock spinlock to the t->udebug.lock mutex.
67	*	67	*
68	* Returns EOK if all went well, or an error code otherwise.	68	* Returns EOK if all went well, or an error code otherwise.
69	*/	69	*/
70	static int _thread_op_begin(thread_t *t, bool having_go)	70	static int _thread_op_begin(thread_t *t, bool having_go)
71	{	71	{
72	task_id_t taskid;	72	task_id_t taskid;
73	ipl_t ipl;	73	ipl_t ipl;
74		74
75	taskid = TASK->taskid;	75	taskid = TASK->taskid;
76		76
77	mutex_lock(&TASK->udebug.lock);	77	mutex_lock(&TASK->udebug.lock);
78		78
79	/* thread_exists() must be called with threads_lock held */	79	/* thread_exists() must be called with threads_lock held */
80	ipl = interrupts_disable();	80	ipl = interrupts_disable();
81	spinlock_lock(&threads_lock);	81	spinlock_lock(&threads_lock);
82		82
83	if (!thread_exists(t)) {	83	if (!thread_exists(t)) {
84	spinlock_unlock(&threads_lock);	84	spinlock_unlock(&threads_lock);
85	interrupts_restore(ipl);	85	interrupts_restore(ipl);
86	mutex_unlock(&TASK->udebug.lock);	86	mutex_unlock(&TASK->udebug.lock);
87	return ENOENT;	87	return ENOENT;
88	}	88	}
89		89
90	/* t->lock is enough to ensure the thread's existence */	90	/* t->lock is enough to ensure the thread's existence */
91	spinlock_lock(&t->lock);	91	spinlock_lock(&t->lock);
92	spinlock_unlock(&threads_lock);	92	spinlock_unlock(&threads_lock);
93		93
94	/* Verify that 't' is a userspace thread */	94	/* Verify that 't' is a userspace thread */
95	if ((t->flags & THREAD_FLAG_USPACE) == 0) {	95	if ((t->flags & THREAD_FLAG_USPACE) == 0) {
96	/* It's not, deny its existence */	96	/* It's not, deny its existence */
97	spinlock_unlock(&t->lock);	97	spinlock_unlock(&t->lock);
98	interrupts_restore(ipl);	98	interrupts_restore(ipl);
99	mutex_unlock(&TASK->udebug.lock);	99	mutex_unlock(&TASK->udebug.lock);
100	return ENOENT;	100	return ENOENT;
101	}	101	}
102		102
103	/* Verify debugging state */	103	/* Verify debugging state */
104	if (t->udebug.debug_active != true) {	104	if (t->udebug.debug_active != true) {
105	/* Not in debugging session or undesired GO state */	105	/* Not in debugging session or undesired GO state */
106	spinlock_unlock(&t->lock);	106	spinlock_unlock(&t->lock);
107	interrupts_restore(ipl);	107	interrupts_restore(ipl);
108	mutex_unlock(&TASK->udebug.lock);	108	mutex_unlock(&TASK->udebug.lock);
109	return ENOENT;	109	return ENOENT;
110	}	110	}
111		111
112	/*	112	/*
113	* Since the thread has debug_active == true, TASK->udebug.lock	113	* Since the thread has debug_active == true, TASK->udebug.lock
114	* is enough to ensure its existence and that debug_active remains	114	* is enough to ensure its existence and that debug_active remains
115	* true.	115	* true.
116	*/	116	*/
117	spinlock_unlock(&t->lock);	117	spinlock_unlock(&t->lock);
118	interrupts_restore(ipl);	118	interrupts_restore(ipl);
119		119
120	/* Only mutex TASK->udebug.lock left */	120	/* Only mutex TASK->udebug.lock left */
121		121
122	/* Now verify that the thread belongs to the current task */	122	/* Now verify that the thread belongs to the current task */
123	if (t->task != TASK) {	123	if (t->task != TASK) {
124	/* No such thread belonging this task*/	124	/* No such thread belonging this task*/
125	mutex_unlock(&TASK->udebug.lock);	125	mutex_unlock(&TASK->udebug.lock);
126	return ENOENT;	126	return ENOENT;
127	}	127	}
128		128
129	/*	129	/*
130	* Now we need to grab the thread's debug lock for synchronization	130	* Now we need to grab the thread's debug lock for synchronization
131	* of the threads stoppability/stop state.	131	* of the threads stoppability/stop state.
132	*/	132	*/
133	mutex_lock(&t->udebug.lock);	133	mutex_lock(&t->udebug.lock);
134		134
135	/* The big task mutex is no longer needed */	135	/* The big task mutex is no longer needed */
136	mutex_unlock(&TASK->udebug.lock);	136	mutex_unlock(&TASK->udebug.lock);
137		137
138	if (!t->udebug.stop != having_go) {	138	if (!t->udebug.stop != having_go) {
139	/* Not in debugging session or undesired GO state */	139	/* Not in debugging session or undesired GO state */
140	mutex_unlock(&t->udebug.lock);	140	mutex_unlock(&t->udebug.lock);
141	return EINVAL;	141	return EINVAL;
142	}	142	}
143		143
144	/* Only t->udebug.lock left */	144	/* Only t->udebug.lock left */
145		145
146	return EOK; /* All went well */	146	return EOK; /* All went well */
147	}	147	}
148		148
149		149
150	static void _thread_op_end(thread_t *t)	150	static void _thread_op_end(thread_t *t)
151	{	151	{
152	mutex_unlock(&t->udebug.lock);	152	mutex_unlock(&t->udebug.lock);
153	}	153	}
154		154
155	/**	155	/**
156	* \return 0 (ok, but not done yet), 1 (done) or negative error code.	156	* \return 0 (ok, but not done yet), 1 (done) or negative error code.
157	*/	157	*/
158	int udebug_begin(call_t *call)	158	int udebug_begin(call_t *call)
159	{	159	{
160	int reply;	160	int reply;
161		161
162	thread_t *t;	162	thread_t *t;
163	link_t *cur;	163	link_t *cur;
164		164
165	printf("udebug_begin()\n");	165	LOG("udebug_begin()\n");
166		166
167	mutex_lock(&TASK->udebug.lock);	167	mutex_lock(&TASK->udebug.lock);
168	printf("debugging task %llu\n", TASK->taskid);	168	LOG("debugging task %llu\n", TASK->taskid);
169		169
170	if (TASK->udebug.dt_state != UDEBUG_TS_INACTIVE) {	170	if (TASK->udebug.dt_state != UDEBUG_TS_INACTIVE) {
171	mutex_unlock(&TASK->udebug.lock);	171	mutex_unlock(&TASK->udebug.lock);
172	printf("udebug_begin(): busy error\n");	172	LOG("udebug_begin(): busy error\n");
173		173
174	return EBUSY;	174	return EBUSY;
175	}	175	}
176		176
177	TASK->udebug.dt_state = UDEBUG_TS_BEGINNING;	177	TASK->udebug.dt_state = UDEBUG_TS_BEGINNING;
178	TASK->udebug.begin_call = call;	178	TASK->udebug.begin_call = call;
179	TASK->udebug.debugger = call->sender;	179	TASK->udebug.debugger = call->sender;
180		180
181	if (TASK->udebug.not_stoppable_count == 0) {	181	if (TASK->udebug.not_stoppable_count == 0) {
182	TASK->udebug.dt_state = UDEBUG_TS_ACTIVE;	182	TASK->udebug.dt_state = UDEBUG_TS_ACTIVE;
183	TASK->udebug.begin_call = NULL;	183	TASK->udebug.begin_call = NULL;
184	reply = 1; /* immediate reply */	184	reply = 1; /* immediate reply */
185	} else {	185	} else {
186	reply = 0; /* no reply */	186	reply = 0; /* no reply */
187	}	187	}
188		188
189	/* Set udebug.debug_active on all of the task's userspace threads */	189	/* Set udebug.debug_active on all of the task's userspace threads */
190		190
191	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {	191	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
192	t = list_get_instance(cur, thread_t, th_link);	192	t = list_get_instance(cur, thread_t, th_link);
193		193
194	mutex_lock(&t->udebug.lock);	194	mutex_lock(&t->udebug.lock);
195	if ((t->flags & THREAD_FLAG_USPACE) != 0)	195	if ((t->flags & THREAD_FLAG_USPACE) != 0)
196	t->udebug.debug_active = true;	196	t->udebug.debug_active = true;
197	mutex_unlock(&t->udebug.lock);	197	mutex_unlock(&t->udebug.lock);
198	}	198	}
199		199
200	mutex_unlock(&TASK->udebug.lock);	200	mutex_unlock(&TASK->udebug.lock);
201		201
202	printf("udebug_begin() done (%s)\n",	202	LOG("udebug_begin() done (%s)\n",
203	reply ? "reply" : "stoppability wait");	203	reply ? "reply" : "stoppability wait");
204		204
205	return reply;	205	return reply;
206	}	206	}
207		207
208	int udebug_end(void)	208	int udebug_end(void)
209	{	209	{
210	int rc;	210	int rc;
211		211
212	printf("udebug_end()\n");	212	LOG("udebug_end()\n");
213		213
214	mutex_lock(&TASK->udebug.lock);	214	mutex_lock(&TASK->udebug.lock);
215	printf("task %llu\n", TASK->taskid);	215	LOG("task %" PRIu64 "\n", TASK->taskid);
216		216
217	rc = udebug_task_cleanup(TASK);	217	rc = udebug_task_cleanup(TASK);
218		218
219	mutex_unlock(&TASK->udebug.lock);	219	mutex_unlock(&TASK->udebug.lock);
220		220
221	return rc;	221	return rc;
222	}	222	}
223		223
224	int udebug_set_evmask(udebug_evmask_t mask)	224	int udebug_set_evmask(udebug_evmask_t mask)
225	{	225	{
226	printf("udebug_set_mask()\n");	226	LOG("udebug_set_mask()\n");
227		-
228	printf("debugging task %llu\n", TASK->taskid);	-
229		227
230	mutex_lock(&TASK->udebug.lock);	228	mutex_lock(&TASK->udebug.lock);
231		229
232	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {	230	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
233	mutex_unlock(&TASK->udebug.lock);	231	mutex_unlock(&TASK->udebug.lock);
234	printf("udebug_set_mask(): not active debuging session\n");	232	LOG("udebug_set_mask(): not active debuging session\n");
235		233
236	return EINVAL;	234	return EINVAL;
237	}	235	}
238		236
239	TASK->udebug.evmask = mask;	237	TASK->udebug.evmask = mask;
240		238
241	mutex_unlock(&TASK->udebug.lock);	239	mutex_unlock(&TASK->udebug.lock);
242		240
243	return 0;	241	return 0;
244	}	242	}
245		243
246		244
247	int udebug_go(thread_t t, call_t call)	245	int udebug_go(thread_t t, call_t call)
248	{	246	{
249	int rc;	247	int rc;
250		248
251	// printf("udebug_go()\n");	-
252		-
253	/* On success, this will lock t->udebug.lock */	249	/* On success, this will lock t->udebug.lock */
254	rc = _thread_op_begin(t, false);	250	rc = _thread_op_begin(t, false);
255	if (rc != EOK) {	251	if (rc != EOK) {
256	return rc;	252	return rc;
257	}	253	}
258		254
259	t->udebug.go_call = call;	255	t->udebug.go_call = call;
260	t->udebug.stop = false;	256	t->udebug.stop = false;
261	t->udebug.cur_event = 0; /* none */	257	t->udebug.cur_event = 0; /* none */
262		258
263	/*	259	/*
264	* Neither t's lock nor threads_lock may be held during wakeup	260	* Neither t's lock nor threads_lock may be held during wakeup
265	*/	261	*/
266	waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST);	262	waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST);
267		263
268	_thread_op_end(t);	264	_thread_op_end(t);
269		265
270	return 0;	266	return 0;
271	}	267	}
272		268
273	int udebug_stop(thread_t t, call_t call)	269	int udebug_stop(thread_t t, call_t call)
274	{	270	{
275	int rc;	271	int rc;
276		272
277	printf("udebug_stop()\n");	273	LOG("udebug_stop()\n");
278	mutex_lock(&TASK->udebug.lock);	274	mutex_lock(&TASK->udebug.lock);
279		275
280	/*	276	/*
281	* On success, this will lock t->udebug.lock. Note that this makes sure	277	* On success, this will lock t->udebug.lock. Note that this makes sure
282	* the thread is not stopped.	278	* the thread is not stopped.
283	*/	279	*/
284	rc = _thread_op_begin(t, true);	280	rc = _thread_op_begin(t, true);
285	if (rc != EOK) {	281	if (rc != EOK) {
286	return rc;	282	return rc;
287	}	283	}
288		284
289	/* Take GO away from the thread */	285	/* Take GO away from the thread */
290	t->udebug.stop = true;	286	t->udebug.stop = true;
291		287
292	if (!t->udebug.stoppable) {	288	if (!t->udebug.stoppable) {
293	/* Answer will be sent when the thread becomes stoppable */	289	/* Answer will be sent when the thread becomes stoppable */
294	_thread_op_end(t);	290	_thread_op_end(t);
295	return 0;	291	return 0;
296	}	292	}
297		293
298	/*	294	/*
299	* Answer GO call	295	* Answer GO call
300	*/	296	*/
301	printf("udebug_stop - answering go call\n");	297	LOG("udebug_stop - answering go call\n");
302		298
303	/* Make sure nobody takes this call away from us */	299	/* Make sure nobody takes this call away from us */
304	call = t->udebug.go_call;	300	call = t->udebug.go_call;
305	t->udebug.go_call = NULL;	301	t->udebug.go_call = NULL;
306		302
307	IPC_SET_RETVAL(call->data, 0);	303	IPC_SET_RETVAL(call->data, 0);
308	IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);	304	IPC_SET_ARG1(call->data, UDEBUG_EVENT_STOP);
309	printf("udebug_stop/ipc_answer\n");	305	LOG("udebug_stop/ipc_answer\n");
310		306
311	THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;	307	THREAD->udebug.cur_event = UDEBUG_EVENT_STOP;
312		308
313	_thread_op_end(t);	309	_thread_op_end(t);
314		310
315	ipc_answer(&TASK->answerbox, call);	311	ipc_answer(&TASK->answerbox, call);
316	mutex_unlock(&TASK->udebug.lock);	312	mutex_unlock(&TASK->udebug.lock);
317		313
318	printf("udebog_stop/done\n");	314	LOG("udebog_stop/done\n");
319	return 0;	315	return 0;
320	}	316	}
321		317
322	int udebug_thread_read(void *buffer, size_t buf_size, size_t n)	318	int udebug_thread_read(void *buffer, size_t buf_size, size_t n)
323	{	319	{
324	thread_t *t;	320	thread_t *t;
325	link_t *cur;	321	link_t *cur;
326	unative_t tid;	322	unative_t tid;
327	unsigned copied_ids;	323	unsigned copied_ids;
328	ipl_t ipl;	324	ipl_t ipl;
329	unative_t *id_buffer;	325	unative_t *id_buffer;
330	int flags;	326	int flags;
331	size_t max_ids;	327	size_t max_ids;
332		328
333	printf("udebug_thread_read()\n");	329	LOG("udebug_thread_read()\n");
334		330
335	/* Allocate a buffer to hold thread IDs */	331	/* Allocate a buffer to hold thread IDs */
336	id_buffer = malloc(buf_size, 0);	332	id_buffer = malloc(buf_size, 0);
337		333
338	mutex_lock(&TASK->udebug.lock);	334	mutex_lock(&TASK->udebug.lock);
339		335
340	/* Verify task state */	336	/* Verify task state */
341	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {	337	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
342	mutex_unlock(&TASK->udebug.lock);	338	mutex_unlock(&TASK->udebug.lock);
343	return EINVAL;	339	return EINVAL;
344	}	340	}
345		341
346	ipl = interrupts_disable();	342	ipl = interrupts_disable();
347	spinlock_lock(&TASK->lock);	343	spinlock_lock(&TASK->lock);
348	/* Copy down the thread IDs */	344	/* Copy down the thread IDs */
349		345
350	max_ids = buf_size / sizeof(unative_t);	346	max_ids = buf_size / sizeof(unative_t);
351	copied_ids = 0;	347	copied_ids = 0;
352		348
353	/* FIXME: make sure the thread isn't past debug shutdown... */	349	/* FIXME: make sure the thread isn't past debug shutdown... */
354	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {	350	for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
355	/* Do not write past end of buffer */	351	/* Do not write past end of buffer */
356	if (copied_ids >= max_ids) break;	352	if (copied_ids >= max_ids) break;
357		353
358	t = list_get_instance(cur, thread_t, th_link);	354	t = list_get_instance(cur, thread_t, th_link);
359		355
360	spinlock_lock(&t->lock);	356	spinlock_lock(&t->lock);
361	flags = t->flags;	357	flags = t->flags;
362	spinlock_unlock(&t->lock);	358	spinlock_unlock(&t->lock);
363		359
364	/* Not interested in kernel threads */	360	/* Not interested in kernel threads */
365	if ((flags & THREAD_FLAG_USPACE) != 0) {	361	if ((flags & THREAD_FLAG_USPACE) != 0) {
366	/* Using thread struct pointer as identification hash */	362	/* Using thread struct pointer as identification hash */
367	tid = (unative_t) t;	363	tid = (unative_t) t;
368	id_buffer[copied_ids++] = tid;	364	id_buffer[copied_ids++] = tid;
369	}	365	}
370	}	366	}
371		367
372	spinlock_unlock(&TASK->lock);	368	spinlock_unlock(&TASK->lock);
373	interrupts_restore(ipl);	369	interrupts_restore(ipl);
374		370
375	mutex_unlock(&TASK->udebug.lock);	371	mutex_unlock(&TASK->udebug.lock);
376		372
377	*buffer = id_buffer;	373	*buffer = id_buffer;
378	n = copied_ids sizeof(unative_t);	374	n = copied_ids sizeof(unative_t);
379		375
380	return 0;	376	return 0;
381	}	377	}
382		378
383	int udebug_args_read(thread_t t, void *buffer)	379	int udebug_args_read(thread_t t, void *buffer)
384	{	380	{
385	int rc;	381	int rc;
386	unative_t *arg_buffer;	382	unative_t *arg_buffer;
387		383
388	// printf("udebug_args_read()\n");	-
389		-
390	/* Prepare a buffer to hold the arguments */	384	/* Prepare a buffer to hold the arguments */
391	arg_buffer = malloc(6 * sizeof(unative_t), 0);	385	arg_buffer = malloc(6 * sizeof(unative_t), 0);
392		386
393	/* On success, this will lock t->udebug.lock */	387	/* On success, this will lock t->udebug.lock */
394	rc = _thread_op_begin(t, false);	388	rc = _thread_op_begin(t, false);
395	if (rc != EOK) {	389	if (rc != EOK) {
396	return rc;	390	return rc;
397	}	391	}
398		392
399	/* Additionally we need to verify that we are inside a syscall */	393	/* Additionally we need to verify that we are inside a syscall */
400	if (t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_B &&	394	if (t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_B &&
401	t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_E) {	395	t->udebug.cur_event != UDEBUG_EVENT_SYSCALL_E) {
402	_thread_op_end(t);	396	_thread_op_end(t);
403	return EINVAL;	397	return EINVAL;
404	}	398	}
405		399
406	/* Copy to a local buffer before releasing the lock */	400	/* Copy to a local buffer before releasing the lock */
407	memcpy(arg_buffer, t->udebug.syscall_args, 6 * sizeof(unative_t));	401	memcpy(arg_buffer, t->udebug.syscall_args, 6 * sizeof(unative_t));
408		402
409	_thread_op_end(t);	403	_thread_op_end(t);
410		404
411	*buffer = arg_buffer;	405	*buffer = arg_buffer;
412	return 0;	406	return 0;
413	}	407	}
414		408
415	int udebug_mem_read(unative_t uspace_addr, size_t n, void **buffer)	409	int udebug_mem_read(unative_t uspace_addr, size_t n, void **buffer)
416	{	410	{
417	void *data_buffer;	411	void *data_buffer;
418	int rc;	412	int rc;
419		413
420	/* Verify task state */	414	/* Verify task state */
421	mutex_lock(&TASK->udebug.lock);	415	mutex_lock(&TASK->udebug.lock);
422		416
423	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {	417	if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) {
424	mutex_unlock(&TASK->udebug.lock);	418	mutex_unlock(&TASK->udebug.lock);
425	return EBUSY;	419	return EBUSY;
426	}	420	}
427		421
428	data_buffer = malloc(n, 0);	422	data_buffer = malloc(n, 0);
429		423
430	// printf("udebug_mem_read: src=%u, size=%u\n", uspace_addr, n);	-
431		-
432	/* NOTE: this is not strictly from a syscall... but that shouldn't	424	/* NOTE: this is not strictly from a syscall... but that shouldn't
433	* be a problem */	425	* be a problem */
434	rc = copy_from_uspace(data_buffer, (void *)uspace_addr, n);	426	rc = copy_from_uspace(data_buffer, (void *)uspace_addr, n);
435	mutex_unlock(&TASK->udebug.lock);	427	mutex_unlock(&TASK->udebug.lock);
436		428
437	if (rc != 0) return rc;	429	if (rc != 0) return rc;
438		430
439	*buffer = data_buffer;	431	*buffer = data_buffer;
440	return 0;	432	return 0;
441	}	433	}
442		434
443	/** @}	435	/** @}
444	*/	436	*/
445		437

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(root)/trunk/kernel/generic/src/udebug/udebug_ops.c @ 3457 – Rev 3438 → 3441