Subversion Repositories HelenOS

/** Create new user task with 1 thread from image

 *

 * @param program_addr Address of program executable image.

 * @param name Program name.

 *

 * @return Initialized main thread of the task or NULL on error.

 */

thread_t *thread_create_program(void *program_addr, char *name)

{

    as_t *as;

    as_area_t *area;

    unsigned int rc;

    task_t *task;

    uspace_arg_t *kernel_uarg;

    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);

    if (kernel_uarg == NULL)

        return NULL;

    kernel_uarg->uspace_entry =

        (void *) ((elf_header_t *) program_addr)->e_entry;

    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;

    kernel_uarg->uspace_thread_function = NULL;

    kernel_uarg->uspace_thread_arg = NULL;

    kernel_uarg->uspace_uarg = NULL;

    as = as_create(0);

    if (as == NULL) {

        free(kernel_uarg);

        return NULL;

    }

    rc = elf_load((elf_header_t *) program_addr, as);

    if (rc != EE_OK) {

        free(kernel_uarg);

        as_destroy(as);

        return NULL;

    }

    /*

     * Create the data as_area.

     */

    area = as_area_create(as,

        AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,

        LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,

        AS_AREA_ATTR_NONE, &anon_backend, NULL);

    if (area == NULL) {

        free(kernel_uarg);

        as_destroy(as);

        return NULL;

    }

    task = task_create(as, name);

    if (task == NULL) {

        free(kernel_uarg);

        as_destroy(as);

        return NULL;

    }

    /*

     * Create the main thread.

     */

    return thread_create(uinit, kernel_uarg, task, THREAD_FLAG_USPACE,

        "uinit", false);

}