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Rev | Author | Line No. | Line |
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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 | } |