Rev 869 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 841 | jermar | 1 | /* |
| 2 | * Swap VMA and LMA in ELF header. |
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| 3 | * |
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| 4 | * by Jakub Jermar <jermar@itbs.cz> |
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| 5 | * |
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| 6 | * GPL'ed, copyleft |
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| 7 | */ |
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| 8 | |||
| 9 | /* |
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| 10 | * HP's IA-64 simulator Ski seems to confuse VMA and LMA in the ELF header. |
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| 11 | * Instead of using LMA, Ski loads sections at their VMA addresses. |
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| 12 | * This short program provides a workaround for this bug by simply |
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| 13 | * swapping VMA and LMA in the ELF header of the executable. |
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| 14 | * |
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| 15 | * Note that after applying this workaround, you will be able to load |
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| 16 | * ELF objects with different VMA and LMA in Ski, but the executable |
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| 17 | * will become wronged for other potential uses. |
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| 18 | */ |
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| 19 | |||
| 20 | #include <stdio.h> |
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| 21 | #include <sys/types.h> |
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| 22 | #include <sys/stat.h> |
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| 23 | #include <sys/mman.h> |
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| 24 | #include <unistd.h> |
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| 25 | #include <fcntl.h> |
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| 26 | |||
| 27 | void syntax(char *prg) |
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| 28 | { |
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| 29 | printf("%s ELF-file\n", prg); |
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| 30 | exit(1); |
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| 31 | } |
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| 32 | |||
| 33 | void error(char *msg) |
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| 34 | { |
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| 35 | printf("Error: %s\n", msg); |
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| 36 | exit(2); |
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| 37 | } |
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| 38 | |||
| 39 | #define ELF_VMA (0x88/sizeof(unsigned long long)) |
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| 40 | #define ELF_LMA (0x90/sizeof(unsigned long long)) |
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| 41 | |||
| 42 | #define LENGTH 0x98 |
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| 43 | |||
| 44 | int main(int argc, char *argv[]) |
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| 45 | { |
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| 46 | int fd; |
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| 47 | unsigned long long vma, lma; |
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| 48 | unsigned long long *elf; |
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| 49 | |||
| 50 | if (argc != 2) |
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| 51 | syntax(argv[0]); |
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| 52 | |||
| 53 | fd = open(argv[1], O_RDWR); |
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| 54 | if (fd == -1) |
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| 55 | error("open failed"); |
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| 56 | |||
| 57 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
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| 58 | if ((void *) elf == (void *) -1) |
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| 59 | error("map failed"); |
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| 60 | |||
| 61 | vma = elf[ELF_VMA]; |
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| 62 | lma = elf[ELF_LMA]; |
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| 63 | elf[ELF_VMA] = lma; |
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| 64 | elf[ELF_LMA] = vma; |
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| 65 | |||
| 66 | if (munmap(elf, LENGTH) == -1) |
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| 67 | error("munmap failed"); |
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| 68 | |||
| 69 | if (close(fd) == -1) |
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| 70 | error("close failed"); |
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| 71 | |||
| 72 | return 0; |
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| 73 | } |