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3203 svoboda 1
/*
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 * Copyright (c) 2001-2004 Jakub Jermar
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericproc
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 * @{
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 */
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/**
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 * @file
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 * @brief   Running userspace programs.
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 */
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#include <main/uinit.h>
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#include <proc/thread.h>
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#include <proc/task.h>
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#include <proc/uarg.h>
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#include <mm/as.h>
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#include <mm/slab.h>
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#include <arch.h>
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#include <adt/list.h>
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#include <ipc/ipc.h>
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#include <ipc/ipcrsc.h>
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#include <security/cap.h>
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#include <lib/elf.h>
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#include <errno.h>
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#include <syscall/copy.h>
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#include <proc/program.h>
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#ifndef LOADED_PROG_STACK_PAGES_NO
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#define LOADED_PROG_STACK_PAGES_NO 1
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#endif
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/**
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 * Points to the binary image used as the program loader. All non-initial
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 * tasks are created from this executable image.
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 */
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void *program_loader = NULL;
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/** Create a program using an existing address space.
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 *
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 * @param as        Address space containing a binary program image.
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 * @param entry_addr    Program entry-point address in program address space.
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 * @param name      Name to set for the program's task.
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 * @param p     Buffer for storing program information.
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 */
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void program_create(as_t *as, uintptr_t entry_addr, char *name, program_t *p)
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{
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    as_area_t *a;
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    uspace_arg_t *kernel_uarg;
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    kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);
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    kernel_uarg->uspace_entry = (void *) entry_addr;
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    kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;
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    kernel_uarg->uspace_thread_function = NULL;
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    kernel_uarg->uspace_thread_arg = NULL;
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    kernel_uarg->uspace_uarg = NULL;
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    p->task = task_create(as, name);
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    ASSERT(p->task);
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    /*
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     * Create the data as_area.
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     */
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    a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE,
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        LOADED_PROG_STACK_PAGES_NO * PAGE_SIZE, USTACK_ADDRESS,
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        AS_AREA_ATTR_NONE, &anon_backend, NULL);
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    /*
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     * Create the main thread.
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     */
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    p->main_thread = thread_create(uinit, kernel_uarg, p->task,
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        THREAD_FLAG_USPACE, "uinit", false);
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    ASSERT(p->main_thread);
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}
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/** Parse an executable image in the kernel memory.
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 *
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 * If the image belongs to a program loader, it is registered as such,
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 * (and *task is set to NULL). Otherwise a task is created from the
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 * executable image. The task is returned in *task.
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 *
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 * @param image_addr    Address of an executable program image.
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 * @param name      Name to set for the program's task.
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 * @param p     Buffer for storing program info. If image_addr
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 *          points to a loader image, p->task will be set to
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 *          NULL and EOK will be returned.
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 *
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 * @return EOK on success or negative error code.
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 */
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int program_create_from_image(void *image_addr, char *name, program_t *p)
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{
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    as_t *as;
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    unsigned int rc;
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    as = as_create(0);
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    ASSERT(as);
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    rc = elf_load((elf_header_t *) image_addr, as, 0);
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    if (rc != EE_OK) {
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        as_destroy(as);
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        p->task = NULL;
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        p->main_thread = NULL;
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        if (rc != EE_LOADER)
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            return ENOTSUP;
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        /* Register image as the program loader */
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        ASSERT(program_loader == NULL);
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        program_loader = image_addr;
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        return EOK;
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    }
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    program_create(as, ((elf_header_t *) image_addr)->e_entry, name, p);
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    return EOK;
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}
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/** Create a task from the program loader image.
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 *
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 * @param p Buffer for storing program info.
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 * @param name  Name to set for the program's task.
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 *
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 * @return EOK on success or negative error code.
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 */
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int program_create_loader(program_t *p, char *name)
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{
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    as_t *as;
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    unsigned int rc;
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    void *loader;
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    as = as_create(0);
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    ASSERT(as);
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    loader = program_loader;
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    if (!loader) return ENOENT;
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    rc = elf_load((elf_header_t *) program_loader, as, ELD_F_LOADER);
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    if (rc != EE_OK) {
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        as_destroy(as);
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        return ENOENT;
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    }
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    program_create(as, ((elf_header_t *) program_loader)->e_entry,
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        name, p);
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    return EOK;
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}
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/** Make program ready.
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 *
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 * Switch program's main thread to the ready state.
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 *
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 * @param p Program to make ready.
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 */
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void program_ready(program_t *p)
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{
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    thread_ready(p->main_thread);
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}
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/** Syscall for creating a new loader instance from userspace.
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 *
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 * Creates a new task from the program loader image and sets
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 * the task name.
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 *
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 * @param name          Name to set on the new task (typically the same
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 *              as the command used to execute it).
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 *
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 * @return 0 on success or an error code from @ref errno.h.
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 */
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unative_t sys_program_spawn_loader(char *uspace_name, size_t name_len)
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{
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    program_t p;
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    int rc;
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    char namebuf[TASK_NAME_BUFLEN];
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    /* Cap length of name and copy it from userspace. */
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    if (name_len > TASK_NAME_BUFLEN - 1)
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        name_len = TASK_NAME_BUFLEN - 1;
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    rc = copy_from_uspace(namebuf, uspace_name, name_len);
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    if (rc != 0)
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        return (unative_t) rc;
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    namebuf[name_len] = '\0';
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    /* Spawn the new task. */
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    rc = program_create_loader(&p, namebuf);
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    if (rc != 0)
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        return rc;
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    // FIXME: control the capabilities
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    cap_set(p.task, cap_get(TASK));
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    program_ready(&p);
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    return EOK;
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}
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/** @}
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 */