| /trunk/kernel/generic/src/udebug/udebug_ipc.c |
|---|
| 0,0 → 1,299 |
| /* |
| * 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 IPC message handling. |
| */ |
| #include <print.h> |
| #include <proc/task.h> |
| #include <proc/thread.h> |
| #include <arch.h> |
| #include <errno.h> |
| #include <ipc/ipc.h> |
| #include <syscall/copy.h> |
| #include <udebug/udebug.h> |
| #include <udebug/udebug_ops.h> |
| #include <udebug/udebug_ipc.h> |
| int udebug_request_preprocess(call_t *call, phone_t *phone) |
| { |
| switch (IPC_GET_ARG1(call->data)) { |
| /* future UDEBUG_M_REGS_WRITE, UDEBUG_M_MEM_WRITE: */ |
| default: |
| break; |
| } |
| return 0; |
| } |
| static void udebug_receive_begin(call_t *call) |
| { |
| int rc; |
| rc = udebug_begin(call); |
| if (rc < 0) { |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| if (rc != 0) { |
| IPC_SET_RETVAL(call->data, 0); |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| } |
| static void udebug_receive_end(call_t *call) |
| { |
| int rc; |
| rc = udebug_end(); |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| static void udebug_receive_set_evmask(call_t *call) |
| { |
| int rc; |
| udebug_evmask_t mask; |
| mask = IPC_GET_ARG2(call->data); |
| rc = udebug_set_evmask(mask); |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| static void udebug_receive_go(call_t *call) |
| { |
| thread_t *t; |
| int rc; |
| //printf("debug_go()\n"); |
| t = (thread_t *)IPC_GET_ARG2(call->data); |
| rc = udebug_go(t, call); |
| if (rc < 0) { |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| } |
| static void udebug_receive_stop(call_t *call) |
| { |
| thread_t *t; |
| int rc; |
| printf("debug_stop()\n"); |
| t = (thread_t *)IPC_GET_ARG2(call->data); |
| rc = udebug_stop(t, call); |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| static void udebug_receive_thread_read(call_t *call) |
| { |
| unative_t uspace_addr; |
| unative_t to_copy; |
| unsigned total_bytes; |
| unsigned buf_size; |
| void *buffer; |
| size_t n; |
| int rc; |
| uspace_addr = IPC_GET_ARG2(call->data); /* Destination address */ |
| buf_size = IPC_GET_ARG3(call->data); /* Dest. buffer size */ |
| /* |
| * Read thread list. Variable n will be filled with actual number |
| * of threads times thread-id size. |
| */ |
| rc = udebug_thread_read(&buffer, buf_size, &n); |
| if (rc < 0) { |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| total_bytes = n; |
| /* Copy MAX(buf_size, total_bytes) bytes */ |
| if (buf_size > total_bytes) |
| to_copy = total_bytes; |
| else |
| to_copy = buf_size; |
| /* |
| * Make use of call->buffer to transfer data to caller's userspace |
| */ |
| IPC_SET_RETVAL(call->data, 0); |
| /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that |
| same code in process_answer() can be used |
| (no way to distinguish method in answer) */ |
| IPC_SET_ARG1(call->data, uspace_addr); |
| IPC_SET_ARG2(call->data, to_copy); |
| IPC_SET_ARG3(call->data, total_bytes); |
| call->buffer = buffer; |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| static void udebug_receive_args_read(call_t *call) |
| { |
| thread_t *t; |
| unative_t uspace_addr; |
| int rc; |
| void *buffer; |
| t = (thread_t *)IPC_GET_ARG2(call->data); |
| rc = udebug_args_read(t, &buffer); |
| if (rc != EOK) { |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| /* |
| * Make use of call->buffer to transfer data to caller's userspace |
| */ |
| uspace_addr = IPC_GET_ARG3(call->data); |
| IPC_SET_RETVAL(call->data, 0); |
| /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that |
| same code in process_answer() can be used |
| (no way to distinguish method in answer) */ |
| IPC_SET_ARG1(call->data, uspace_addr); |
| IPC_SET_ARG2(call->data, 6 * sizeof(unative_t)); |
| call->buffer = buffer; |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| static void udebug_receive_mem_read(call_t *call) |
| { |
| unative_t uspace_dst; |
| unative_t uspace_src; |
| unsigned size; |
| void *buffer; |
| int rc; |
| uspace_dst = IPC_GET_ARG2(call->data); |
| uspace_src = IPC_GET_ARG3(call->data); |
| size = IPC_GET_ARG4(call->data); |
| rc = udebug_mem_read(uspace_src, size, &buffer); |
| if (rc < 0) { |
| IPC_SET_RETVAL(call->data, rc); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| IPC_SET_RETVAL(call->data, 0); |
| /* ARG1=dest, ARG2=size as in IPC_M_DATA_READ so that |
| same code in process_answer() can be used |
| (no way to distinguish method in answer) */ |
| IPC_SET_ARG1(call->data, uspace_dst); |
| IPC_SET_ARG2(call->data, size); |
| call->buffer = buffer; |
| ipc_answer(&TASK->kernel_box, call); |
| } |
| /** |
| * Handle a debug call received on the kernel answerbox. |
| * |
| * This is called by the kbox servicing thread. |
| */ |
| void udebug_call_receive(call_t *call) |
| { |
| int debug_method; |
| debug_method = IPC_GET_ARG1(call->data); |
| if (debug_method != UDEBUG_M_BEGIN) { |
| /* |
| * Verify that the sender is this task's debugger. |
| * Note that this is the only thread that could change |
| * TASK->debugger. Therefore no locking is necessary |
| * and the sender can be safely considered valid until |
| * control exits this function. |
| */ |
| if (TASK->udebug.debugger != call->sender) { |
| IPC_SET_RETVAL(call->data, EINVAL); |
| ipc_answer(&TASK->kernel_box, call); |
| return; |
| } |
| } |
| switch (debug_method) { |
| case UDEBUG_M_BEGIN: |
| udebug_receive_begin(call); |
| break; |
| case UDEBUG_M_END: |
| udebug_receive_end(call); |
| break; |
| case UDEBUG_M_SET_EVMASK: |
| udebug_receive_set_evmask(call); |
| break; |
| case UDEBUG_M_GO: |
| udebug_receive_go(call); |
| break; |
| case UDEBUG_M_STOP: |
| udebug_receive_stop(call); |
| break; |
| case UDEBUG_M_THREAD_READ: |
| udebug_receive_thread_read(call); |
| break; |
| case UDEBUG_M_ARGS_READ: |
| udebug_receive_args_read(call); |
| break; |
| case UDEBUG_M_MEM_READ: |
| udebug_receive_mem_read(call); |
| break; |
| } |
| } |
| /** @} |
| */ |
| /trunk/kernel/generic/src/udebug/udebug.c |
|---|
| 0,0 → 1,502 |
| /* |
| * 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. |
| * |
| * Functions in this file are executed directly in each thread, which |
| * may or may not be the subject of debugging. The udebug_stoppable_begin/end() |
| * functions are also executed in the clock interrupt handler. To avoid |
| * deadlock, functions in this file are protected from the interrupt |
| * by locking the recursive lock THREAD->udebug.int_lock (just an atomic |
| * variable). This prevents udebug_stoppable_begin/end() from being |
| * executed in the interrupt handler (they are skipped). |
| * |
| * Functions in udebug_ops.c and udebug_ipc.c execute in different threads, |
| * so they needn't be protected from the (preemptible) interrupt-initiated |
| * code. |
| */ |
| #include <synch/waitq.h> |
| #include <print.h> |
| #include <udebug/udebug.h> |
| #include <errno.h> |
| #include <arch.h> |
| static inline void udebug_int_lock(void) |
| { |
| atomic_inc(&THREAD->udebug.int_lock); |
| } |
| static inline void udebug_int_unlock(void) |
| { |
| atomic_dec(&THREAD->udebug.int_lock); |
| } |
| void udebug_task_init(udebug_task_t *ut) |
| { |
| mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
| ut->dt_state = UDEBUG_TS_INACTIVE; |
| ut->begin_call = NULL; |
| ut->not_stoppable_count = 0; |
| ut->evmask = 0; |
| } |
| void udebug_thread_initialize(udebug_thread_t *ut) |
| { |
| mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
| waitq_initialize(&ut->go_wq); |
| /* |
| * At the beginning the thread is stoppable, so int_lock be set, too. |
| */ |
| atomic_set(&ut->int_lock, 1); |
| ut->go_call = NULL; |
| ut->stop = true; |
| ut->stoppable = true; |
| ut->debug_active = false; |
| ut->cur_event = 0; /* none */ |
| } |
| static void udebug_wait_for_go(waitq_t *wq) |
| { |
| int rc; |
| ipl_t ipl; |
| ipl = waitq_sleep_prepare(wq); |
| wq->missed_wakeups = 0; /* Enforce blocking. */ |
| rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
| waitq_sleep_finish(wq, rc, ipl); |
| } |
| /** Do a preliminary check that a debugging session is in progress. |
| * |
| * This only requires the THREAD->udebug.lock mutex (and not |
| * TASK->udebug.lock mutex). For an undebugged task, this will |
| * never block (while there could be collisions by different threads |
| * on the TASK mutex), thus improving SMP perormance for undebugged tasks. |
| */ |
| static bool udebug_thread_precheck(void) |
| { |
| bool res; |
| mutex_lock(&THREAD->udebug.lock); |
| res = THREAD->udebug.debug_active; |
| mutex_unlock(&THREAD->udebug.lock); |
| return res; |
| } |
| void udebug_stoppable_begin(void) |
| { |
| int nsc; |
| call_t *db_call, *go_call; |
| ASSERT(THREAD); |
| ASSERT(TASK); |
| udebug_int_lock(); |
| /* Early check for undebugged tasks */ |
| if (!udebug_thread_precheck()) { |
| udebug_int_unlock(); |
| return; |
| } |
| mutex_lock(&TASK->udebug.lock); |
| nsc = --TASK->udebug.not_stoppable_count; |
| /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
| mutex_lock(&THREAD->udebug.lock); |
| ASSERT(THREAD->udebug.stoppable == false); |
| THREAD->udebug.stoppable = true; |
| if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
| /* |
| * This was the last non-stoppable thread. Reply to |
| * DEBUG_BEGIN call. |
| */ |
| db_call = TASK->udebug.begin_call; |
| ASSERT(db_call); |
| TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
| TASK->udebug.begin_call = NULL; |
| IPC_SET_RETVAL(db_call->data, 0); |
| ipc_answer(&TASK->answerbox, db_call); |
| } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
| /* |
| * Active debugging session |
| */ |
| if (THREAD->udebug.debug_active && THREAD->udebug.stop) { |
| /* |
| * Thread was requested to stop - answer go call |
| */ |
| /* Make sure nobody takes this call away from us */ |
| go_call = THREAD->udebug.go_call; |
| THREAD->udebug.go_call = NULL; |
| ASSERT(go_call); |
| IPC_SET_RETVAL(go_call->data, 0); |
| IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
| THREAD->udebug.cur_event = UDEBUG_EVENT_STOP; |
| ipc_answer(&TASK->answerbox, go_call); |
| } |
| } |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| } |
| void udebug_stoppable_end(void) |
| { |
| /* Early check for undebugged tasks */ |
| if (!udebug_thread_precheck()) { |
| udebug_int_unlock(); |
| return; |
| } |
| restart: |
| mutex_lock(&TASK->udebug.lock); |
| mutex_lock(&THREAD->udebug.lock); |
| if (THREAD->udebug.debug_active && |
| THREAD->udebug.stop == true) { |
| TASK->udebug.begin_call = NULL; |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| udebug_wait_for_go(&THREAD->udebug.go_wq); |
| goto restart; |
| /* must try again - have to lose stoppability atomically */ |
| } else { |
| ++TASK->udebug.not_stoppable_count; |
| ASSERT(THREAD->udebug.stoppable == true); |
| THREAD->udebug.stoppable = false; |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| } |
| udebug_int_unlock(); |
| } |
| /** Upon being scheduled to run, check if the current thread should stop. |
| * |
| * This function is called from clock(). Preemption is enabled. |
| * interrupts are disabled, but since this is called after |
| * being scheduled-in, we can enable them, if we're careful enough |
| * not to allow arbitrary recursion or deadlock with the thread context. |
| */ |
| void udebug_before_thread_runs(void) |
| { |
| ipl_t ipl; |
| return; |
| ASSERT(!PREEMPTION_DISABLED); |
| /* |
| * Prevent agains re-entering, such as when preempted inside this |
| * function. |
| */ |
| if (atomic_get(&THREAD->udebug.int_lock) != 0) |
| return; |
| udebug_int_lock(); |
| ipl = interrupts_enable(); |
| /* Now we're free to do whatever we need (lock mutexes, sleep, etc.) */ |
| /* Check if we're supposed to stop */ |
| udebug_stoppable_begin(); |
| udebug_stoppable_end(); |
| interrupts_restore(ipl); |
| udebug_int_unlock(); |
| } |
| 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, |
| bool end_variant) |
| { |
| call_t *call; |
| udebug_event_t etype; |
| etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
| udebug_int_lock(); |
| /* Early check for undebugged tasks */ |
| if (!udebug_thread_precheck()) { |
| udebug_int_unlock(); |
| return; |
| } |
| mutex_lock(&TASK->udebug.lock); |
| mutex_lock(&THREAD->udebug.lock); |
| /* Must only generate events when in debugging session and have go */ |
| if (THREAD->udebug.debug_active != true || |
| THREAD->udebug.stop == true || |
| (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| return; |
| } |
| //printf("udebug_syscall_event\n"); |
| call = THREAD->udebug.go_call; |
| THREAD->udebug.go_call = NULL; |
| IPC_SET_RETVAL(call->data, 0); |
| IPC_SET_ARG1(call->data, etype); |
| IPC_SET_ARG2(call->data, id); |
| IPC_SET_ARG3(call->data, rc); |
| //printf("udebug_syscall_event/ipc_answer\n"); |
| THREAD->udebug.syscall_args[0] = a1; |
| THREAD->udebug.syscall_args[1] = a2; |
| THREAD->udebug.syscall_args[2] = a3; |
| THREAD->udebug.syscall_args[3] = a4; |
| THREAD->udebug.syscall_args[4] = a5; |
| THREAD->udebug.syscall_args[5] = a6; |
| /* |
| * Make sure udebug.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->udebug.stop = true; |
| THREAD->udebug.cur_event = etype; |
| ipc_answer(&TASK->answerbox, call); |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| udebug_wait_for_go(&THREAD->udebug.go_wq); |
| udebug_int_unlock(); |
| } |
| void udebug_thread_b_event(struct thread *t) |
| { |
| call_t *call; |
| udebug_int_lock(); |
| mutex_lock(&TASK->udebug.lock); |
| mutex_lock(&THREAD->udebug.lock); |
| printf("udebug_thread_b_event\n"); |
| printf("- check state\n"); |
| /* Must only generate events when in debugging session */ |
| if (THREAD->udebug.debug_active != true) { |
| printf("- debug_active: %s, udebug.stop: %s\n", |
| THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
| THREAD->udebug.stop ? "yes(-)" : "no(+)"); |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| return; |
| } |
| printf("- trigger event\n"); |
| call = THREAD->udebug.go_call; |
| THREAD->udebug.go_call = NULL; |
| IPC_SET_RETVAL(call->data, 0); |
| IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
| IPC_SET_ARG2(call->data, (unative_t)t); |
| /* |
| * Make sure udebug.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->udebug.stop = true; |
| THREAD->udebug.cur_event = UDEBUG_EVENT_THREAD_B; |
| ipc_answer(&TASK->answerbox, call); |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| printf("- sleep\n"); |
| udebug_wait_for_go(&THREAD->udebug.go_wq); |
| udebug_int_unlock(); |
| } |
| void udebug_thread_e_event(void) |
| { |
| call_t *call; |
| udebug_int_lock(); |
| mutex_lock(&TASK->udebug.lock); |
| mutex_lock(&THREAD->udebug.lock); |
| // printf("udebug_thread_e_event\n"); |
| // printf("- check state\n"); |
| /* Must only generate events when in debugging session */ |
| if (THREAD->udebug.debug_active != true) { |
| /* printf("- debug_active: %s, udebug.stop: %s\n", |
| THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
| THREAD->udebug.stop ? "yes(-)" : "no(+)");*/ |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| return; |
| } |
| // printf("- trigger event\n"); |
| call = THREAD->udebug.go_call; |
| THREAD->udebug.go_call = NULL; |
| IPC_SET_RETVAL(call->data, 0); |
| IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
| /* Prevent any further debug activity in thread */ |
| THREAD->udebug.debug_active = false; |
| THREAD->udebug.cur_event = 0; /* none */ |
| THREAD->udebug.stop = true; /* set to initial value */ |
| ipc_answer(&TASK->answerbox, call); |
| mutex_unlock(&THREAD->udebug.lock); |
| mutex_unlock(&TASK->udebug.lock); |
| /* Leave int_lock enabled */ |
| /* This event does not sleep - debugging has finished in this thread */ |
| } |
| /** |
| * Terminate task debugging session. |
| * |
| * \param ta->udebug.lock must be already locked. |
| * \return Zero on success or negative error code. |
| */ |
| int udebug_task_cleanup(struct task *ta) |
| { |
| thread_t *t; |
| link_t *cur; |
| int flags; |
| ipl_t ipl; |
| printf("udebug_task_cleanup()\n"); |
| printf("task %llu\n", ta->taskid); |
| udebug_int_lock(); |
| if (ta->udebug.dt_state != UDEBUG_TS_BEGINNING && |
| ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
| printf("udebug_task_cleanup(): task not being debugged\n"); |
| 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); |
| mutex_lock(&t->udebug.lock); |
| ipl = interrupts_disable(); |
| spinlock_lock(&t->lock); |
| flags = t->flags; |
| spinlock_unlock(&t->lock); |
| interrupts_restore(ipl); |
| /* Only process userspace threads */ |
| if ((flags & THREAD_FLAG_USPACE) != 0) { |
| /* Prevent any further debug activity in thread */ |
| t->udebug.debug_active = false; |
| t->udebug.cur_event = 0; /* none */ |
| /* Still has go? */ |
| if (t->udebug.stop == false) { |
| /* |
| * Yes, so clear go. As debug_active == false, |
| * this doesn't affect anything. |
| */ |
| t->udebug.stop = true; |
| /* Answer GO call */ |
| printf("answer GO call with EVENT_FINISHED\n"); |
| IPC_SET_RETVAL(t->udebug.go_call->data, 0); |
| IPC_SET_ARG1(t->udebug.go_call->data, UDEBUG_EVENT_FINISHED); |
| ipc_answer(&ta->answerbox, t->udebug.go_call); |
| t->udebug.go_call = NULL; |
| } 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->udebug.go_wq, WAKEUP_FIRST); |
| } |
| } |
| mutex_unlock(&t->udebug.lock); |
| } |
| ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
| ta->udebug.debugger = NULL; |
| udebug_int_unlock(); |
| return 0; |
| } |
| /** @} |
| */ |
| /trunk/kernel/generic/src/udebug/udebug_ops.c |
|---|
| 0,0 → 1,444 |
| /* |
| * 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 <print.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; |
| printf("udebug_begin()\n"); |
| mutex_lock(&TASK->udebug.lock); |
| printf("debugging task %llu\n", TASK->taskid); |
| if (TASK->udebug.dt_state != UDEBUG_TS_INACTIVE) { |
| mutex_unlock(&TASK->udebug.lock); |
| printf("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); |
| printf("udebug_begin() done (%s)\n", |
| reply ? "reply" : "stoppability wait"); |
| return reply; |
| } |
| int udebug_end(void) |
| { |
| int rc; |
| printf("udebug_end()\n"); |
| mutex_lock(&TASK->udebug.lock); |
| printf("task %llu\n", TASK->taskid); |
| rc = udebug_task_cleanup(TASK); |
| mutex_unlock(&TASK->udebug.lock); |
| return rc; |
| } |
| int udebug_set_evmask(udebug_evmask_t mask) |
| { |
| printf("udebug_set_mask()\n"); |
| printf("debugging task %llu\n", TASK->taskid); |
| mutex_lock(&TASK->udebug.lock); |
| if (TASK->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
| mutex_unlock(&TASK->udebug.lock); |
| printf("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; |
| // printf("udebug_go()\n"); |
| /* 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; |
| printf("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 |
| */ |
| printf("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); |
| printf("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); |
| printf("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; |
| printf("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; |
| // printf("udebug_args_read()\n"); |
| /* 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); |
| // printf("udebug_mem_read: src=%u, size=%u\n", uspace_addr, n); |
| /* 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; |
| } |
| /** @} |
| */ |