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/** @addtogroup generic

 * @{

 */

/**

 * @file

 * @brief   Tdebug.

 */

#include <console/klog.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_ipc.h>

static task_t *get_lock_callee_task(phone_t *phone)

{

    answerbox_t *answerbox;

    task_t *ta;

    // FIXME: locking!!!

    answerbox = phone->callee;

    ta = answerbox->task;

    spinlock_lock(&ta->lock);

    return ta;

}

static thread_t *get_task_thread_by_id(task_t *ta, thread_id_t tid)

{

    thread_t *t;

    link_t *cur;

    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {

        t = list_get_instance(cur, thread_t, th_link);     

        if (tid == t->tid) return t;

    }

    return NULL;

}

static int udebug_rp_begin(call_t *call, phone_t *phone)

{

    task_t *ta;

    klog_printf("debug_begin()");

    ta = get_lock_callee_task(phone);

    klog_printf("debugging task %llu", ta->taskid);

    if (ta->being_debugged != false) {

        spinlock_unlock(&ta->lock);

        klog_printf("debug_begin(): busy error");

        return EBUSY;

    }

    ta->being_debugged = true;

    ta->stop_request = true;

    ta->debug_begin_call = call;

    if (ta->not_stoppable_count == 0) {

        ta->debug_begin_call = NULL;

        ta->stop_request = false;

        spinlock_unlock(&ta->lock);

        klog_printf("debug_begin(): immediate backsend");

        return 1; /* actually we need backsend with 0 retval */

    }

    spinlock_unlock(&ta->lock);

    klog_printf("debug_begin() done (wait for stoppability)");

    return 0;

}

static int udebug_rp_go(call_t *call, phone_t *phone)

{

    thread_t *t;

    task_t *ta;

    klog_printf("debug_go()");

    ta = get_lock_callee_task(phone);

    ta->debug_go_call = call;

    t = get_task_thread_by_id(ta, IPC_GET_ARG2(call->data));

    if (t == NULL) {

        spinlock_unlock(&ta->lock);

        return ENOENT;

    }

    klog_printf("debug_go(): waitq_wakeup");

    waitq_wakeup(&t->go_wq, WAKEUP_FIRST);

    spinlock_unlock(&ta->lock);

    return 0; /* no backsend */

}

static int udebug_rp_args_read(call_t *call, phone_t *phone)

{

    thread_t *t;

    task_t *ta;

    void *uspace_buffer;

    unative_t to_copy;

    int rc;

    klog_printf("debug_args_read()");

    // FIXME: verify task/thread state

    ta = get_lock_callee_task(phone);

    klog_printf("task %llu", ta->taskid);

    t = get_task_thread_by_id(ta, IPC_GET_ARG2(call->data));

    if (t == NULL) {

        spinlock_unlock(&ta->lock);

        return ENOENT;

    }

    uspace_buffer = (void *)IPC_GET_ARG3(call->data);

    to_copy = IPC_GET_ARG4(call->data);

    if (to_copy > 6 * sizeof(unative_t)) to_copy = 6 * sizeof(unative_t);

    rc = copy_to_uspace(uspace_buffer, t->syscall_args, to_copy);

    if (rc != 0) {

        spinlock_unlock(&ta->lock);

        klog_printf("debug_args_read() - copy failed");

        return rc;

    }

    spinlock_unlock(&ta->lock);

    IPC_SET_ARG1(call->data, to_copy);

    klog_printf("debug_args_read() done");

    return 1; /* actually need becksend with retval 0 */

}

static int udebug_rp_thread_read(call_t *call, phone_t *phone)

{

    thread_t *t;

    link_t *cur;

    task_t *ta;

    unative_t *uspace_buffer;

    unative_t to_copy;

    int rc;

    unsigned copied, total;

    unsigned buf_size;

    unative_t tid;

    klog_printf("debug_thread_read()");

    // FIXME: verify task/thread state

    ta = get_lock_callee_task(phone);

    klog_printf("task %llu", ta->taskid);

    uspace_buffer = (void *)IPC_GET_ARG2(call->data);

    buf_size = IPC_GET_ARG3(call->data);

    copied = total = 0;

    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {

        t = list_get_instance(cur, thread_t, th_link);

        /* Not interested in kernel threads */

        if ((t->flags & THREAD_FLAG_USPACE) == 0)

            continue;

        //FIXME: id cropped!!

        tid = (unative_t) t->tid;

        to_copy = sizeof(unative_t);

        if (copied + to_copy >= buf_size)

            to_copy = buf_size - copied;

        if (to_copy > 0) {

            rc = copy_to_uspace(uspace_buffer, &tid, to_copy);

            if (rc != 0) {

                spinlock_unlock(&ta->lock);

                klog_printf("debug_thread_read() - copy failed");

                return rc;

            }

        }

        ++uspace_buffer;

        total += sizeof(unative_t);

        copied += to_copy;

    }

    spinlock_unlock(&ta->lock);

    IPC_SET_ARG1(call->data, copied);

    IPC_SET_ARG2(call->data, total);

    klog_printf("debug_thread_read() done");

    return 1; /* actually need becksend with retval 0 */

}

int udebug_request_preprocess(call_t *call, phone_t *phone)

{

    int rc;

    switch (IPC_GET_ARG1(call->data)) {

    case UDEBUG_M_BEGIN:

        rc = udebug_rp_begin(call, phone);

        return rc;

    case UDEBUG_M_GO:

        rc = udebug_rp_go(call, phone);

        return rc;

    case UDEBUG_M_ARGS_READ:

        rc = udebug_rp_args_read(call, phone);

        return rc;

    case UDEBUG_M_THREAD_READ:

        rc = udebug_rp_thread_read(call, phone);

        return rc;

    default:

        break;

    }

    return 0;

}

static void udebug_receive_mem_read(call_t *call)

{

    unative_t uspace_dst;

    void *uspace_ptr;

    unsigned size;

    void *buffer;

    int rc;

    klog_printf("debug_mem_read()");

    uspace_dst = IPC_GET_ARG2(call->data);

    uspace_ptr = (void *)IPC_GET_ARG3(call->data);

    size = IPC_GET_ARG4(call->data);

    buffer = malloc(size, 0); // ???

    klog_printf("debug_mem_read: src=%u, size=%u", uspace_ptr, size);

    /* NOTE: this is not strictly from a syscall... but that shouldn't

     * be a problem */

    rc = copy_from_uspace(buffer, uspace_ptr, size);

    if (rc) {

        IPC_SET_RETVAL(call->data, rc);

        return;

    }

    klog_printf("first word: %u", *((unative_t *)buffer));

    IPC_SET_RETVAL(call->data, 0);

    /* Hack: 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);

    switch (debug_method) {

    case UDEBUG_M_MEM_READ:

        udebug_receive_mem_read(call);

        break;

    }

}

/** @}

 */