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| 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 | |||
| 869 | vana | 39 | #define ELF_VMA (0x50/sizeof(unsigned long long)) |
| 40 | #define ELF_LMA (0x58/sizeof(unsigned long long)) |
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| 41 | #define ELF_ENTRY (0x18/sizeof(unsigned long long)) |
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| 841 | jermar | 42 | |
| 43 | #define LENGTH 0x98 |
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| 44 | |||
| 45 | int main(int argc, char *argv[]) |
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| 46 | { |
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| 47 | int fd; |
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| 869 | vana | 48 | unsigned long long vma, lma,entry; |
| 841 | jermar | 49 | unsigned long long *elf; |
| 50 | |||
| 51 | if (argc != 2) |
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| 52 | syntax(argv[0]); |
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| 53 | |||
| 54 | fd = open(argv[1], O_RDWR); |
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| 55 | if (fd == -1) |
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| 56 | error("open failed"); |
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| 57 | |||
| 58 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
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| 59 | if ((void *) elf == (void *) -1) |
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| 60 | error("map failed"); |
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| 61 | |||
| 869 | vana | 62 | /*vma = elf[ELF_VMA];*/ |
| 841 | jermar | 63 | lma = elf[ELF_LMA]; |
| 64 | elf[ELF_VMA] = lma; |
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| 869 | vana | 65 | entry = elf[ELF_ENTRY]; |
| 66 | entry &= ((~0LL)>>3); |
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| 67 | elf[ELF_ENTRY] = entry; |
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| 68 | elf[ELF_ENTRY] = 0x100000; |
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| 69 | /*elf[ELF_LMA] = vma;*/ |
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| 841 | jermar | 70 | |
| 71 | if (munmap(elf, LENGTH) == -1) |
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| 72 | error("munmap failed"); |
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| 73 | |||
| 74 | if (close(fd) == -1) |
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| 75 | error("close failed"); |
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| 76 | |||
| 77 | return 0; |
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| 78 | } |