WebSVN – HelenOS – Diff – /branches/tracing/kernel/generic/src/udebug/udebug.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.
 */
 
#include <synch/waitq.h>
#include <console/klog.h>
#include <udebug/udebug.h>
#include <errno.h>
#include <arch.h>
 
void udebug_stoppable_begin(void)
{
    int nsc;
    call_t *db_call, *go_call;
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&TASK->lock);
 
    nsc = --TASK->not_stoppable_count;
    db_call = TASK->debug_begin_call;
 
    if (TASK->dt_state == UDEBUG_TS_BEGINNING) {
        klog_printf("udebug_stoppable_begin");
        klog_printf(" - nsc := %d", nsc);
    }
 
    if (TASK->dt_state == UDEBUG_TS_BEGINNING && nsc == 0) {
        /*
         * This was the last non-stoppable thread. Reply to
         * DEBUG_BEGIN call.
         */
 
        /* Lock order OK, THREAD->debug_lock is after TASK->lock */
        spinlock_lock(&THREAD->debug_lock);
        THREAD->debug_stoppable = true;
        spinlock_unlock(&THREAD->debug_lock);
 
        TASK->dt_state = UDEBUG_TS_ACTIVE;
        TASK->debug_begin_call = NULL;
        spinlock_unlock(&TASK->lock);
        interrupts_restore(ipl);
 
        IPC_SET_RETVAL(db_call->data, 0);
        klog_printf("udebug_stoppable_begin/ipc_answer");
        ipc_answer(&TASK->answerbox, db_call);     
 
    } else if (TASK->dt_state == UDEBUG_TS_ACTIVE) {
        /*
         * Active debugging session
         */
 
        /* Lock order OK, THREAD->debug_lock is after TASK->lock */
        spinlock_lock(&THREAD->debug_lock);
        THREAD->debug_stoppable = true;
 
        if (THREAD->debug_stop) {
            /*
             * Thread was requested to stop - answer go call
             */
 
            /* Make sure nobody takes this call away from us */
            go_call = THREAD->debug_go_call;
            THREAD->debug_go_call = NULL;
 
            IPC_SET_RETVAL(go_call->data, 0);
            IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP);
 
            THREAD->cur_event = UDEBUG_EVENT_STOP;
            spinlock_unlock(&THREAD->debug_lock);
 
                ipc_answer(&TASK->answerbox, go_call);
 
                spinlock_unlock(&TASK->lock);
            interrupts_restore(ipl);
        } else {
            /*
             * No stop request - nothing happens.
             */
            spinlock_unlock(&THREAD->debug_lock);
                spinlock_unlock(&TASK->lock);
            interrupts_restore(ipl);
        }
    } else {
        /*
         * All other cases - nothing special happens.
         */
 
        /* Lock order OK, THREAD->debug_lock is after TASK->lock */
        spinlock_lock(&THREAD->debug_lock);
        THREAD->debug_stoppable = true;
        spinlock_unlock(&THREAD->debug_lock);
 
            spinlock_unlock(&TASK->lock);
        interrupts_restore(ipl);
    }
}
 
void udebug_stoppable_end(void)
{
    ipl_t ipl;
 
restart:
    ipl = interrupts_disable();
    spinlock_lock(&TASK->lock);
 
    /* Lock order OK, THREAD->debug_lock is after TASK->lock */
    spinlock_lock(&THREAD->debug_lock);
 
    if (TASK->dt_state == UDEBUG_TS_ACTIVE) {
        klog_printf("udebug_stoppable_end");
        klog_printf("debug_stop=%d", THREAD->debug_stop);
    }
 
    if ((TASK->dt_state == UDEBUG_TS_BEGINNING ||
        TASK->dt_state == UDEBUG_TS_ACTIVE) &&
        THREAD->debug_stop == true) {
        TASK->debug_begin_call = NULL;
        spinlock_unlock(&THREAD->debug_lock);
        spinlock_unlock(&TASK->lock);
        interrupts_restore(ipl);
 
        klog_printf("udebug_stoppable_end: waitq_sleep");
        waitq_sleep(&THREAD->go_wq);
        goto restart;
        /* must try again - have to lose stoppability atomically */
    } else {
        ++TASK->not_stoppable_count;
        THREAD->debug_stoppable = false;
 
        spinlock_unlock(&THREAD->debug_lock);
        spinlock_unlock(&TASK->lock);
        interrupts_restore(ipl);
    }
}
 
void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,
    unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc)
{
    call_t *call;
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->debug_lock);
 
    /* Must only generate events when in debugging session and have go */
    if (THREAD->debug_active != true ||
        THREAD->debug_stop == true ||
        (TASK->debug_evmask & UDEBUG_EM_SYSCALL) == 0) {
        spinlock_unlock(&THREAD->debug_lock);
        interrupts_restore(ipl);
        return;
    }
 
    klog_printf("udebug_syscall_event");
    call = THREAD->debug_go_call;
    IPC_SET_RETVAL(call->data, 0);
    IPC_SET_ARG1(call->data, UDEBUG_EVENT_SYSCALL);
    IPC_SET_ARG2(call->data, id);
    IPC_SET_ARG3(call->data, rc);
    klog_printf("udebug_syscall_event/ipc_answer");
 
    THREAD->syscall_args[0] = a1;
    THREAD->syscall_args[1] = a2;
    THREAD->syscall_args[2] = a3;
    THREAD->syscall_args[3] = a4;
    THREAD->syscall_args[4] = a5;
    THREAD->syscall_args[5] = a6;
 
    /*
     * Make sure debug_stop is true when going to sleep
     * in case we get woken up by DEBUG_END. (At which
     * point it must be back to the initial true value).
     */
    THREAD->debug_stop = true;
 
    THREAD->cur_event = UDEBUG_EVENT_SYSCALL;
    spinlock_unlock(&THREAD->debug_lock);
 
    spinlock_lock(&TASK->lock);
    ipc_answer(&TASK->answerbox, THREAD->debug_go_call);
    spinlock_unlock(&TASK->lock);
 
    interrupts_restore(ipl);
 
    waitq_sleep(&THREAD->go_wq);
}
 
void udebug_new_thread_event(struct thread *t)
{
    call_t *call;
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->debug_lock);
 
    klog_printf("udebug_new_thread_event");
    klog_printf("- check state");
 
    /* Must only generate events when in debugging session */
    if (THREAD->debug_active != true) {
        klog_printf("- debug_active: %s, debug_stop: %s",
            THREAD->debug_active ? "yes(+)" : "no(-)",
            THREAD->debug_stop ? "yes(-)" : "no(+)");
        spinlock_unlock(&THREAD->debug_lock);
        interrupts_restore(ipl);
        return;
    }
 
    klog_printf("- trigger event");
 
    call = THREAD->debug_go_call;
    IPC_SET_RETVAL(call->data, 0);
    IPC_SET_ARG1(call->data, UDEBUG_EVENT_NEW_THREAD);
    IPC_SET_ARG2(call->data, (unative_t)t);
 
    /*
     * Make sure debug_stop is true when going to sleep
     * in case we get woken up by DEBUG_END. (At which
     * point it must be back to the initial true value).
     */
    THREAD->debug_stop = true;
 
    THREAD->cur_event = UDEBUG_EVENT_NEW_THREAD;
    spinlock_unlock(&THREAD->debug_lock);
 
    spinlock_lock(&TASK->lock);
    ipc_answer(&TASK->answerbox, THREAD->debug_go_call);
    spinlock_unlock(&TASK->lock);
 
    interrupts_restore(ipl);
    klog_printf("- sleep");
 
    waitq_sleep(&THREAD->go_wq);
}
 
/**
 * Terminate task debugging session.
 *
 * \param ta Must be already locked and interrupts must be disabled.
 * \return Zero on success or negative error code.
 */
int udebug_task_cleanup(struct task *ta)
{
    thread_t *t;
    link_t *cur;
    int flags;
 
    klog_printf("udebug_task_cleanup()");
    klog_printf("task %llu", ta->taskid);
 
    if (ta->dt_state == UDEBUG_TS_BEGINNING &&
        ta->dt_state != UDEBUG_TS_ACTIVE) {
        klog_printf("udebug_task_cleanup(): task not being debugged");
        return EINVAL;
    }
 
    /* Finish debugging of all userspace threads */
    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
        t = list_get_instance(cur, thread_t, th_link);
 
        spinlock_lock(&t->debug_lock);
        spinlock_lock(&t->lock);
 
        flags = t->flags;
 
        spinlock_unlock(&t->lock);
 
        /* Only process userspace threads */
        if ((flags & THREAD_FLAG_USPACE) != 0) {
            /* Prevent any further debug activity in thread */
            t->debug_active = false;
            t->cur_event = 0;   /* none */
 
            /* Still has go? */
            if (t->debug_stop == false) {
                /*
                * Yes, so clear go. As debug_active == false,
                 * this doesn't affect anything.
                 */
                t->debug_stop = true;  
 
                /* Answer GO call */
                klog_printf("answer GO call with EVENT_FINISHED");
                IPC_SET_RETVAL(t->debug_go_call->data, 0);
                IPC_SET_ARG1(t->debug_go_call->data, UDEBUG_EVENT_FINISHED);
                ipc_answer(&ta->answerbox, t->debug_go_call);
            } else {
                /*
                 * Debug_stop is already at initial value.
                 * Yet this means the thread needs waking up.
                 */
 
                /*
                 * t's lock must not be held when calling
                 * waitq_wakeup.
                 */
                waitq_wakeup(&t->go_wq, WAKEUP_FIRST);
            }
        }
        spinlock_unlock(&t->debug_lock);
    }
 
    ta->dt_state = UDEBUG_TS_INACTIVE;
    ta->debugger = NULL;
 
    return 0;
}
 
 
/** @}
 */
 

Rev 2898	Rev 2899
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.	35	* @brief Udebug.
36	*/	36	*/
37		37
38	#include <synch/waitq.h>	38	#include <synch/waitq.h>
39	#include <console/klog.h>	39	#include <console/klog.h>
40	#include <udebug/udebug.h>	40	#include <udebug/udebug.h>
41	#include <errno.h>	41	#include <errno.h>
42	#include <arch.h>	42	#include <arch.h>
43		43
44	void udebug_stoppable_begin(void)	44	void udebug_stoppable_begin(void)
45	{	45	{
46	int nsc;	46	int nsc;
47	call_t db_call, go_call;	47	call_t db_call, go_call;
48	ipl_t ipl;	48	ipl_t ipl;
49		49
50	ipl = interrupts_disable();	50	ipl = interrupts_disable();
51	spinlock_lock(&TASK->lock);	51	spinlock_lock(&TASK->lock);
52		52
53	nsc = --TASK->not_stoppable_count;	53	nsc = --TASK->not_stoppable_count;
54	db_call = TASK->debug_begin_call;	54	db_call = TASK->debug_begin_call;
55		55
56	if (TASK->dt_state == UDEBUG_TS_BEGINNING) {	56	if (TASK->dt_state == UDEBUG_TS_BEGINNING) {
57	klog_printf("udebug_stoppable_begin");	57	klog_printf("udebug_stoppable_begin");
58	klog_printf(" - nsc := %d", nsc);	58	klog_printf(" - nsc := %d", nsc);
59	}	59	}
60		60
61	if (TASK->dt_state == UDEBUG_TS_BEGINNING && nsc == 0) {	61	if (TASK->dt_state == UDEBUG_TS_BEGINNING && nsc == 0) {
62	/*	62	/*
63	* This was the last non-stoppable thread. Reply to	63	* This was the last non-stoppable thread. Reply to
64	* DEBUG_BEGIN call.	64	* DEBUG_BEGIN call.
65	*/	65	*/
66		66
67	/* Lock order OK, THREAD->debug_lock is after TASK->lock */	67	/* Lock order OK, THREAD->debug_lock is after TASK->lock */
68	spinlock_lock(&THREAD->debug_lock);	68	spinlock_lock(&THREAD->debug_lock);
69	THREAD->debug_stoppable = true;	69	THREAD->debug_stoppable = true;
70	spinlock_unlock(&THREAD->debug_lock);	70	spinlock_unlock(&THREAD->debug_lock);
71		71
72	TASK->dt_state = UDEBUG_TS_ACTIVE;	72	TASK->dt_state = UDEBUG_TS_ACTIVE;
73	TASK->debug_begin_call = NULL;	73	TASK->debug_begin_call = NULL;
74	spinlock_unlock(&TASK->lock);	74	spinlock_unlock(&TASK->lock);
75	interrupts_restore(ipl);	75	interrupts_restore(ipl);
76		76
77	IPC_SET_RETVAL(db_call->data, 0);	77	IPC_SET_RETVAL(db_call->data, 0);
78	klog_printf("udebug_stoppable_begin/ipc_answer");	78	klog_printf("udebug_stoppable_begin/ipc_answer");
79	ipc_answer(&TASK->answerbox, db_call);	79	ipc_answer(&TASK->answerbox, db_call);
80		80
81	} else if (TASK->dt_state == UDEBUG_TS_ACTIVE) {	81	} else if (TASK->dt_state == UDEBUG_TS_ACTIVE) {
82	/*	82	/*
83	* Active debugging session	83	* Active debugging session
84	*/	84	*/
85		85
86	/* Lock order OK, THREAD->debug_lock is after TASK->lock */	86	/* Lock order OK, THREAD->debug_lock is after TASK->lock */
87	spinlock_lock(&THREAD->debug_lock);	87	spinlock_lock(&THREAD->debug_lock);
88	THREAD->debug_stoppable = true;	88	THREAD->debug_stoppable = true;
89		89
90	if (THREAD->debug_stop) {	90	if (THREAD->debug_stop) {
91	/*	91	/*
92	* Thread was requested to stop - answer go call	92	* Thread was requested to stop - answer go call
93	*/	93	*/
94		94
95	/* Make sure nobody takes this call away from us */	95	/* Make sure nobody takes this call away from us */
96	go_call = THREAD->debug_go_call;	96	go_call = THREAD->debug_go_call;
97	THREAD->debug_go_call = NULL;	97	THREAD->debug_go_call = NULL;
98		98
99	IPC_SET_RETVAL(go_call->data, 0);	99	IPC_SET_RETVAL(go_call->data, 0);
100	IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP);	100	IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP);
101		101
102	THREAD->cur_event = UDEBUG_EVENT_STOP;	102	THREAD->cur_event = UDEBUG_EVENT_STOP;
103	spinlock_unlock(&THREAD->debug_lock);	103	spinlock_unlock(&THREAD->debug_lock);
104		104
105	ipc_answer(&TASK->answerbox, go_call);	105	ipc_answer(&TASK->answerbox, go_call);
106		106
107	spinlock_unlock(&TASK->lock);	107	spinlock_unlock(&TASK->lock);
108	interrupts_restore(ipl);	108	interrupts_restore(ipl);
109	} else {	109	} else {
110	/*	110	/*
111	* No stop request - nothing happens.	111	* No stop request - nothing happens.
112	*/	112	*/
113	spinlock_unlock(&THREAD->debug_lock);	113	spinlock_unlock(&THREAD->debug_lock);
114	spinlock_unlock(&TASK->lock);	114	spinlock_unlock(&TASK->lock);
115	interrupts_restore(ipl);	115	interrupts_restore(ipl);
116	}	116	}
117	} else {	117	} else {
118	/*	118	/*
119	* All other cases - nothing special happens.	119	* All other cases - nothing special happens.
120	*/	120	*/
121		121
122	/* Lock order OK, THREAD->debug_lock is after TASK->lock */	122	/* Lock order OK, THREAD->debug_lock is after TASK->lock */
123	spinlock_lock(&THREAD->debug_lock);	123	spinlock_lock(&THREAD->debug_lock);
124	THREAD->debug_stoppable = true;	124	THREAD->debug_stoppable = true;
125	spinlock_unlock(&THREAD->debug_lock);	125	spinlock_unlock(&THREAD->debug_lock);
126		126
127	spinlock_unlock(&TASK->lock);	127	spinlock_unlock(&TASK->lock);
128	interrupts_restore(ipl);	128	interrupts_restore(ipl);
129	}	129	}
130	}	130	}
131		131
132	void udebug_stoppable_end(void)	132	void udebug_stoppable_end(void)
133	{	133	{
134	ipl_t ipl;	134	ipl_t ipl;
135		135
136	restart:	136	restart:
137	ipl = interrupts_disable();	137	ipl = interrupts_disable();
138	spinlock_lock(&TASK->lock);	138	spinlock_lock(&TASK->lock);
139		139
140	/* Lock order OK, THREAD->debug_lock is after TASK->lock */	140	/* Lock order OK, THREAD->debug_lock is after TASK->lock */
141	spinlock_lock(&THREAD->debug_lock);	141	spinlock_lock(&THREAD->debug_lock);
142		142
143	if (TASK->dt_state == UDEBUG_TS_ACTIVE) {	143	if (TASK->dt_state == UDEBUG_TS_ACTIVE) {
144	klog_printf("udebug_stoppable_end");	144	klog_printf("udebug_stoppable_end");
145	klog_printf("debug_stop=%d", THREAD->debug_stop);	145	klog_printf("debug_stop=%d", THREAD->debug_stop);
146	}	146	}
147		147
148	if ((TASK->dt_state == UDEBUG_TS_BEGINNING \|\|	148	if ((TASK->dt_state == UDEBUG_TS_BEGINNING \|\|
149	TASK->dt_state == UDEBUG_TS_ACTIVE) &&	149	TASK->dt_state == UDEBUG_TS_ACTIVE) &&
150	THREAD->debug_stop == true) {	150	THREAD->debug_stop == true) {
151	TASK->debug_begin_call = NULL;	151	TASK->debug_begin_call = NULL;
152	spinlock_unlock(&THREAD->debug_lock);	152	spinlock_unlock(&THREAD->debug_lock);
153	spinlock_unlock(&TASK->lock);	153	spinlock_unlock(&TASK->lock);
154	interrupts_restore(ipl);	154	interrupts_restore(ipl);
155		155
156	klog_printf("udebug_stoppable_end: waitq_sleep");	156	klog_printf("udebug_stoppable_end: waitq_sleep");
157	waitq_sleep(&THREAD->go_wq);	157	waitq_sleep(&THREAD->go_wq);
158	goto restart;	158	goto restart;
159	/* must try again - have to lose stoppability atomically */	159	/* must try again - have to lose stoppability atomically */
160	} else {	160	} else {
161	++TASK->not_stoppable_count;	161	++TASK->not_stoppable_count;
162	THREAD->debug_stoppable = false;	162	THREAD->debug_stoppable = false;
163		163
164	spinlock_unlock(&THREAD->debug_lock);	164	spinlock_unlock(&THREAD->debug_lock);
165	spinlock_unlock(&TASK->lock);	165	spinlock_unlock(&TASK->lock);
166	interrupts_restore(ipl);	166	interrupts_restore(ipl);
167	}	167	}
168	}	168	}
169		169
170	void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,	170	void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3,
171	unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc)	171	unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc)
172	{	172	{
173	call_t *call;	173	call_t *call;
174	ipl_t ipl;	174	ipl_t ipl;
175		175
176	ipl = interrupts_disable();	176	ipl = interrupts_disable();
177	spinlock_lock(&THREAD->debug_lock);	177	spinlock_lock(&THREAD->debug_lock);
178		178
179	/* Must only generate events when in debugging session and have go */	179	/* Must only generate events when in debugging session and have go */
180	if (THREAD->debug_active != true \|\|	180	if (THREAD->debug_active != true \|\|
181	THREAD->debug_stop == true) {	181	THREAD->debug_stop == true \|\|
-		182	(TASK->debug_evmask & UDEBUG_EM_SYSCALL) == 0) {
182	spinlock_unlock(&THREAD->debug_lock);	183	spinlock_unlock(&THREAD->debug_lock);
183	interrupts_restore(ipl);	184	interrupts_restore(ipl);
184	return;	185	return;
185	}	186	}
186		187
187	klog_printf("udebug_syscall_event");	188	klog_printf("udebug_syscall_event");
188	call = THREAD->debug_go_call;	189	call = THREAD->debug_go_call;
189	IPC_SET_RETVAL(call->data, 0);	190	IPC_SET_RETVAL(call->data, 0);
190	IPC_SET_ARG1(call->data, UDEBUG_EVENT_SYSCALL);	191	IPC_SET_ARG1(call->data, UDEBUG_EVENT_SYSCALL);
191	IPC_SET_ARG2(call->data, id);	192	IPC_SET_ARG2(call->data, id);
192	IPC_SET_ARG3(call->data, rc);	193	IPC_SET_ARG3(call->data, rc);
193	klog_printf("udebug_syscall_event/ipc_answer");	194	klog_printf("udebug_syscall_event/ipc_answer");
194		195
195	THREAD->syscall_args[0] = a1;	196	THREAD->syscall_args[0] = a1;
196	THREAD->syscall_args[1] = a2;	197	THREAD->syscall_args[1] = a2;
197	THREAD->syscall_args[2] = a3;	198	THREAD->syscall_args[2] = a3;
198	THREAD->syscall_args[3] = a4;	199	THREAD->syscall_args[3] = a4;
199	THREAD->syscall_args[4] = a5;	200	THREAD->syscall_args[4] = a5;
200	THREAD->syscall_args[5] = a6;	201	THREAD->syscall_args[5] = a6;
201		202
202	/*	203	/*
203	* Make sure debug_stop is true when going to sleep	204	* Make sure debug_stop is true when going to sleep
204	* in case we get woken up by DEBUG_END. (At which	205	* in case we get woken up by DEBUG_END. (At which
205	* point it must be back to the initial true value).	206	* point it must be back to the initial true value).
206	*/	207	*/
207	THREAD->debug_stop = true;	208	THREAD->debug_stop = true;
208		209
209	THREAD->cur_event = UDEBUG_EVENT_SYSCALL;	210	THREAD->cur_event = UDEBUG_EVENT_SYSCALL;
210	spinlock_unlock(&THREAD->debug_lock);	211	spinlock_unlock(&THREAD->debug_lock);
211		212
212	spinlock_lock(&TASK->lock);	213	spinlock_lock(&TASK->lock);
213	ipc_answer(&TASK->answerbox, THREAD->debug_go_call);	214	ipc_answer(&TASK->answerbox, THREAD->debug_go_call);
214	spinlock_unlock(&TASK->lock);	215	spinlock_unlock(&TASK->lock);
215		216
216	interrupts_restore(ipl);	217	interrupts_restore(ipl);
217		218
218	waitq_sleep(&THREAD->go_wq);	219	waitq_sleep(&THREAD->go_wq);
219	}	220	}
220		221
221	void udebug_new_thread_event(struct thread *t)	222	void udebug_new_thread_event(struct thread *t)
222	{	223	{
223	call_t *call;	224	call_t *call;
224	ipl_t ipl;	225	ipl_t ipl;
225		226
226	ipl = interrupts_disable();	227	ipl = interrupts_disable();
227	spinlock_lock(&THREAD->debug_lock);	228	spinlock_lock(&THREAD->debug_lock);
228		229
229	klog_printf("udebug_new_thread_event");	230	klog_printf("udebug_new_thread_event");
230	klog_printf("- check state");	231	klog_printf("- check state");
231		232
232	/* Must only generate events when in debugging session */	233	/* Must only generate events when in debugging session */
233	if (THREAD->debug_active != true) {	234	if (THREAD->debug_active != true) {
234	klog_printf("- debug_active: %s, debug_stop: %s",	235	klog_printf("- debug_active: %s, debug_stop: %s",
235	THREAD->debug_active ? "yes(+)" : "no(-)",	236	THREAD->debug_active ? "yes(+)" : "no(-)",
236	THREAD->debug_stop ? "yes(-)" : "no(+)");	237	THREAD->debug_stop ? "yes(-)" : "no(+)");
237	spinlock_unlock(&THREAD->debug_lock);	238	spinlock_unlock(&THREAD->debug_lock);
238	interrupts_restore(ipl);	239	interrupts_restore(ipl);
239	return;	240	return;
240	}	241	}
241		242
242	klog_printf("- trigger event");	243	klog_printf("- trigger event");
243		244
244	call = THREAD->debug_go_call;	245	call = THREAD->debug_go_call;
245	IPC_SET_RETVAL(call->data, 0);	246	IPC_SET_RETVAL(call->data, 0);
246	IPC_SET_ARG1(call->data, UDEBUG_EVENT_NEW_THREAD);	247	IPC_SET_ARG1(call->data, UDEBUG_EVENT_NEW_THREAD);
247	IPC_SET_ARG2(call->data, (unative_t)t);	248	IPC_SET_ARG2(call->data, (unative_t)t);
248		249
249	/*	250	/*
250	* Make sure debug_stop is true when going to sleep	251	* Make sure debug_stop is true when going to sleep
251	* in case we get woken up by DEBUG_END. (At which	252	* in case we get woken up by DEBUG_END. (At which
252	* point it must be back to the initial true value).	253	* point it must be back to the initial true value).
253	*/	254	*/
254	THREAD->debug_stop = true;	255	THREAD->debug_stop = true;
255		256
256	THREAD->cur_event = UDEBUG_EVENT_NEW_THREAD;	257	THREAD->cur_event = UDEBUG_EVENT_NEW_THREAD;
257	spinlock_unlock(&THREAD->debug_lock);	258	spinlock_unlock(&THREAD->debug_lock);
258		259
259	spinlock_lock(&TASK->lock);	260	spinlock_lock(&TASK->lock);
260	ipc_answer(&TASK->answerbox, THREAD->debug_go_call);	261	ipc_answer(&TASK->answerbox, THREAD->debug_go_call);
261	spinlock_unlock(&TASK->lock);	262	spinlock_unlock(&TASK->lock);
262		263
263	interrupts_restore(ipl);	264	interrupts_restore(ipl);
264	klog_printf("- sleep");	265	klog_printf("- sleep");
265		266
266	waitq_sleep(&THREAD->go_wq);	267	waitq_sleep(&THREAD->go_wq);
267	}	268	}
268		269
269	/**	270	/**
270	* Terminate task debugging session.	271	* Terminate task debugging session.
271	*	272	*
272	* \param ta Must be already locked and interrupts must be disabled.	273	* \param ta Must be already locked and interrupts must be disabled.
273	* \return Zero on success or negative error code.	274	* \return Zero on success or negative error code.
274	*/	275	*/
275	int udebug_task_cleanup(struct task *ta)	276	int udebug_task_cleanup(struct task *ta)
276	{	277	{
277	thread_t *t;	278	thread_t *t;
278	link_t *cur;	279	link_t *cur;
279	int flags;	280	int flags;
280		281
281	klog_printf("udebug_task_cleanup()");	282	klog_printf("udebug_task_cleanup()");
282	klog_printf("task %llu", ta->taskid);	283	klog_printf("task %llu", ta->taskid);
283		284
284	if (ta->dt_state == UDEBUG_TS_BEGINNING &&	285	if (ta->dt_state == UDEBUG_TS_BEGINNING &&
285	ta->dt_state != UDEBUG_TS_ACTIVE) {	286	ta->dt_state != UDEBUG_TS_ACTIVE) {
286	klog_printf("udebug_task_cleanup(): task not being debugged");	287	klog_printf("udebug_task_cleanup(): task not being debugged");
287	return EINVAL;	288	return EINVAL;
288	}	289	}
289		290
290	/* Finish debugging of all userspace threads */	291	/* Finish debugging of all userspace threads */
291	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {	292	for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {
292	t = list_get_instance(cur, thread_t, th_link);	293	t = list_get_instance(cur, thread_t, th_link);
293		294
294	spinlock_lock(&t->debug_lock);	295	spinlock_lock(&t->debug_lock);
295	spinlock_lock(&t->lock);	296	spinlock_lock(&t->lock);
296		297
297	flags = t->flags;	298	flags = t->flags;
298		299
299	spinlock_unlock(&t->lock);	300	spinlock_unlock(&t->lock);
300		301
301	/* Only process userspace threads */	302	/* Only process userspace threads */
302	if ((flags & THREAD_FLAG_USPACE) != 0) {	303	if ((flags & THREAD_FLAG_USPACE) != 0) {
303	/* Prevent any further debug activity in thread */	304	/* Prevent any further debug activity in thread */
304	t->debug_active = false;	305	t->debug_active = false;
305	t->cur_event = 0; /* none */	306	t->cur_event = 0; /* none */
306		307
307	/* Still has go? */	308	/* Still has go? */
308	if (t->debug_stop == false) {	309	if (t->debug_stop == false) {
309	/*	310	/*
310	* Yes, so clear go. As debug_active == false,	311	* Yes, so clear go. As debug_active == false,
311	* this doesn't affect anything.	312	* this doesn't affect anything.
312	*/	313	*/
313	t->debug_stop = true;	314	t->debug_stop = true;
314		315
315	/* Answer GO call */	316	/* Answer GO call */
316	klog_printf("answer GO call with EVENT_FINISHED");	317	klog_printf("answer GO call with EVENT_FINISHED");
317	IPC_SET_RETVAL(t->debug_go_call->data, 0);	318	IPC_SET_RETVAL(t->debug_go_call->data, 0);
318	IPC_SET_ARG1(t->debug_go_call->data, UDEBUG_EVENT_FINISHED);	319	IPC_SET_ARG1(t->debug_go_call->data, UDEBUG_EVENT_FINISHED);
319	ipc_answer(&ta->answerbox, t->debug_go_call);	320	ipc_answer(&ta->answerbox, t->debug_go_call);
320	} else {	321	} else {
321	/*	322	/*
322	* Debug_stop is already at initial value.	323	* Debug_stop is already at initial value.
323	* Yet this means the thread needs waking up.	324	* Yet this means the thread needs waking up.
324	*/	325	*/
325		326
326	/*	327	/*
327	* t's lock must not be held when calling	328	* t's lock must not be held when calling
328	* waitq_wakeup.	329	* waitq_wakeup.
329	*/	330	*/
330	waitq_wakeup(&t->go_wq, WAKEUP_FIRST);	331	waitq_wakeup(&t->go_wq, WAKEUP_FIRST);
331	}	332	}
332	}	333	}
333	spinlock_unlock(&t->debug_lock);	334	spinlock_unlock(&t->debug_lock);
334	}	335	}
335		336
336	ta->dt_state = UDEBUG_TS_INACTIVE;	337	ta->dt_state = UDEBUG_TS_INACTIVE;
337	ta->debugger = NULL;	338	ta->debugger = NULL;
338		339
339	return 0;	340	return 0;
340	}	341	}
341		342
342		343
343	/** @}	344	/** @}
344	*/	345	*/
345		346

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(root)/branches/tracing/kernel/generic/src/udebug/udebug.c @ 2896 – Rev 2898 → 2899