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/*
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/*
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 * Copyright (c) 2008 Jiri Svoboda
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 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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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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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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 *
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 *
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 * - Redistributions of source code must retain the above copyright
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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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 *   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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 * - 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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 *   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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 *   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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 * - 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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 *   derived from this software without specific prior written permission.
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 *
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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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * 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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 * (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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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup loader
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/** @addtogroup loader
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 * @brief   Loads and runs programs from VFS.
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 * @brief   Loads and runs programs from VFS.
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 * @{
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 * @{
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 */
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 */
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/**
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/**
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 * @file
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 * @file
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 */
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 */
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#include <stdio.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <as.h>
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#include "elf.h"
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#include "elf.h"
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#include "pcb.h"
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unsigned int elf_load(int fd, elf_header_t *header);
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unsigned int elf_load(int fd, elf_header_t *header);
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typedef void (*entry_point_t)(void);
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typedef void (*entry_point_t)(void);
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int elf_load_file(char *file_name, elf_header_t *header)
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int elf_load_file(char *file_name, elf_header_t *header)
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{
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{
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    int fd;
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    int fd;
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    int rc;
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    int rc;
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    printf("open and read '%s'...\n", file_name);
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    printf("open and read '%s'...\n", file_name);
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    fd = open(file_name, 0);
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    fd = open(file_name, 0);
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    if (fd < 0) {
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    if (fd < 0) {
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        printf("failed opening file\n");
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        printf("failed opening file\n");
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        return -1;
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        return -1;
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    }
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    }
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    rc = elf_load(fd, header);
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    rc = elf_load(fd, header);
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    printf("elf_load() -> %d\n", rc);
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    printf("elf_load() -> %d\n", rc);
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    close(fd);
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    close(fd);
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    return rc;
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    return rc;
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}
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}
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void elf_run(elf_header_t *header)
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void elf_run(elf_header_t *header)
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{
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{
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    entry_point_t entry_point;
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    entry_point_t entry_point;
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    entry_point = (entry_point_t)header->e_entry;
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    entry_point = (entry_point_t)header->e_entry;
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    (*entry_point)();
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    (*entry_point)();
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    /* not reached */
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    /* not reached */
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}
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}
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void elf_create_pcb(elf_header_t *header)
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{
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    pcb_t *pcb;
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    void *a;
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    pcb = (pcb_t *)PCB_ADDRESS;
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    a = as_area_create(pcb, sizeof(pcb_t), AS_AREA_READ | AS_AREA_WRITE);
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    if (a == (void *)(-1)) {
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        printf("elf_create_pcb: memory mapping failed\n");
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        return EE_MEMORY;
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    }
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    pcb->entry = (entry_point_t)header->e_entry;
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}
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int main(int argc, char *argv[])
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int main(int argc, char *argv[])
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{
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{
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    elf_header_t header;
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    elf_header_t prog_header;
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    elf_header_t interp_header;
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    char *file_name;
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    char *file_name;
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    int rc;
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    int rc;
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    printf("This is loader\n");
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    printf("This is loader\n");
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    getchar();
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    getchar();
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    file_name = "/test";
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    rc = elf_load_file(file_name, &header);
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    printf("open and read '%s'...\n", file_name);
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    printf("Load program\n");
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    rc = elf_load_file("/tetris", &prog_header);
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    if (rc < 0) {
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    if (rc < 0) {
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        printf("failed to load program\n");
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        printf("failed to load program\n");
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        return 1;
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        return 1;
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    }
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    }
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    printf("run program\n");
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    printf("Create PCB\n");
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    elf_create_pcb(&prog_header);  
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    printf("Load dynamic linker\n");
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    file_name = "/rtld.so";
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    printf("open and read '%s'...\n", file_name);
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    rc = elf_load_file(file_name, &interp_header);
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    if (rc < 0) {
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        printf("failed to load dynamic linker\n");
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        return 1;
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    }
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    printf("run dynamic linker\n");
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    elf_run(&header);
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    elf_run(&interp_header);
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    /* not reached */
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    /* not reached */
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    return 0;
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    return 0;
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}
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}
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/** @}
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/** @}
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 */
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 */
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