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#include <stdio.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <align.h>
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#include <align.h>
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#include <assert.h>
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#include <assert.h>
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#include <as.h>
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#include <as.h>
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#include <unistd.h>
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#include <fcntl.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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#include "elf_load.h"
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#define RTLD_BIAS 0x80000
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#define RTLD_BIAS 0x80000
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//#define RTLD_BIAS 0
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//#define RTLD_BIAS 0
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static char *error_codes[] = {
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static char *error_codes[] = {
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    "incompatible image",
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    "incompatible image",
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    "unsupported image type",
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    "unsupported image type",
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    "irrecoverable error"
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    "irrecoverable error"
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};
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};
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static unsigned int elf_load(int fd, elf_header_t *header);
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static int segment_header(int fd, elf_header_t *elf);
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static int segment_header(int fd, elf_header_t *elf);
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static int section_header(int fd, elf_header_t *elf);
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static int section_header(int fd, elf_header_t *elf);
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static int load_segment(int fd, elf_segment_header_t *entry, elf_header_t *elf);
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static int load_segment(int fd, elf_segment_header_t *entry, elf_header_t *elf);
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typedef void (*epoint_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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{
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    int fd;
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    int rc;
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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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    if (fd < 0) {
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        printf("failed opening file\n");
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        return -1;
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    }
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    rc = elf_load(fd, header);
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    printf("elf_load() -> %d\n", rc);
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    close(fd);
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    return rc;
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}
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void elf_run(elf_header_t *header)
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{
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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)();
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    /* not reached */
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}
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int 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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    return 0;
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}
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/** ELF loader
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/** ELF loader
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 *
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 *
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 * @param header Pointer to ELF header in memory
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 * @param header Pointer to ELF header in memory
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 * @return EE_OK on success
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 * @return EE_OK on success
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 */
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 */
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unsigned int elf_load(int fd, elf_header_t *header)
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static unsigned int elf_load(int fd, elf_header_t *header)
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{
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{
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    int i, rc;
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    int i, rc;
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    rc = read(fd, header, sizeof(elf_header_t));
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    rc = read(fd, header, sizeof(elf_header_t));
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    if (rc < 0) {
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    if (rc < 0) {