Subversion Repositories HelenOS

/*

 * Swap VMA and LMA in ELF header.

 *

 *  by Jakub Jermar <jermar@itbs.cz>

 *

 *  GPL'ed, copyleft

 */

/*

 * HP's IA-64 simulator Ski seems to confuse VMA and LMA in the ELF header.

 * Instead of using LMA, Ski loads sections at their VMA addresses.

 * This short program provides a workaround for this bug by simply

 * swapping VMA and LMA in the ELF header of the executable.

 *

 * Note that after applying this workaround, you will be able to load

 * ELF objects with different VMA and LMA in Ski, but the executable

 * will become wronged for other potential uses.

 */

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/mman.h>

#include <unistd.h>

#include <fcntl.h>

void syntax(char *prg)

{

    printf("%s ELF-file\n", prg);

    exit(1);

}

void error(char *msg)

{

    printf("Error: %s\n", msg);

    exit(2);

}

#define ELF_VMA (0x50/sizeof(unsigned long long))

#define ELF_LMA (0x58/sizeof(unsigned long long))

#define ELF_ENTRY (0x18/sizeof(unsigned long long))

#define LENGTH  0x98

int main(int argc, char *argv[])

{

    int fd;

    unsigned long long vma, lma,entry;

    unsigned long long *elf;

    if (argc != 2)

        syntax(argv[0]);

    fd = open(argv[1], O_RDWR);

    if (fd == -1)

        error("open failed");

    elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

    if ((void *) elf  == (void *) -1)

        error("map failed");

    lma = elf[ELF_LMA];

    elf[ELF_VMA] = lma;

    entry = lma;

    elf[ELF_ENTRY] = entry;

    if (munmap(elf, LENGTH) == -1)

        error("munmap failed");

    if (close(fd) == -1)

        error("close failed");

    return 0;

}