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841 jermar 1
/*
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 * Swap VMA and LMA in ELF header.
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 *
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 *  by Jakub Jermar <jermar@itbs.cz>
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 *
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 *  GPL'ed, copyleft
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 */
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/*
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 * HP's IA-64 simulator Ski seems to confuse VMA and LMA in the ELF header.
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 * Instead of using LMA, Ski loads sections at their VMA addresses.
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 * This short program provides a workaround for this bug by simply
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 * swapping VMA and LMA in the ELF header of the executable.
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 *
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 * Note that after applying this workaround, you will be able to load
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 * ELF objects with different VMA and LMA in Ski, but the executable
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 * will become wronged for other potential uses.
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 */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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void syntax(char *prg)
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{
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    printf("%s ELF-file\n", prg);
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    exit(1);
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}
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void error(char *msg)
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{
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    printf("Error: %s\n", msg);
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    exit(2);
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}
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869 vana 39
#define ELF_VMA (0x50/sizeof(unsigned long long))
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#define ELF_LMA (0x58/sizeof(unsigned long long))
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#define ELF_ENTRY (0x18/sizeof(unsigned long long))
841 jermar 42
 
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#define LENGTH  0x98
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int main(int argc, char *argv[])
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{
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    int fd;
869 vana 48
    unsigned long long vma, lma,entry;
841 jermar 49
    unsigned long long *elf;
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    if (argc != 2)
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        syntax(argv[0]);
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    fd = open(argv[1], O_RDWR);
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    if (fd == -1)
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        error("open failed");
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    elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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    if ((void *) elf  == (void *) -1)
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        error("map failed");
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    lma = elf[ELF_LMA];
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    elf[ELF_VMA] = lma;
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    entry = lma;
869 vana 65
    elf[ELF_ENTRY] = entry;
841 jermar 66
 
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    if (munmap(elf, LENGTH) == -1)
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        error("munmap failed");
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    if (close(fd) == -1)
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        error("close failed");
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    return 0;
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}