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| 1 | /* |
1 | /* |
| 2 | * Swap VMA and LMA in ELF header. |
2 | * Swap VMA and LMA in ELF header. |
| 3 | * |
3 | * |
| 4 | * by Jakub Jermar <jermar@itbs.cz> |
4 | * by Jakub Jermar <jermar@itbs.cz> |
| 5 | * |
5 | * |
| 6 | * GPL'ed, copyleft |
6 | * GPL'ed, copyleft |
| 7 | */ |
7 | */ |
| 8 | 8 | ||
| 9 | /* |
9 | /* |
| 10 | * HP's IA-64 simulator Ski seems to confuse VMA and LMA in the ELF header. |
10 | * HP's IA-64 simulator Ski seems to confuse VMA and LMA in the ELF header. |
| 11 | * Instead of using LMA, Ski loads sections at their VMA addresses. |
11 | * Instead of using LMA, Ski loads sections at their VMA addresses. |
| 12 | * This short program provides a workaround for this bug by simply |
12 | * This short program provides a workaround for this bug by simply |
| 13 | * swapping VMA and LMA in the ELF header of the executable. |
13 | * swapping VMA and LMA in the ELF header of the executable. |
| 14 | * |
14 | * |
| 15 | * Note that after applying this workaround, you will be able to load |
15 | * Note that after applying this workaround, you will be able to load |
| 16 | * ELF objects with different VMA and LMA in Ski, but the executable |
16 | * ELF objects with different VMA and LMA in Ski, but the executable |
| 17 | * will become wronged for other potential uses. |
17 | * will become wronged for other potential uses. |
| 18 | */ |
18 | */ |
| 19 | 19 | ||
| 20 | #include <stdio.h> |
20 | #include <stdio.h> |
| 21 | #include <sys/types.h> |
21 | #include <sys/types.h> |
| 22 | #include <sys/stat.h> |
22 | #include <sys/stat.h> |
| 23 | #include <sys/mman.h> |
23 | #include <sys/mman.h> |
| 24 | #include <unistd.h> |
24 | #include <unistd.h> |
| 25 | #include <fcntl.h> |
25 | #include <fcntl.h> |
| 26 | 26 | ||
| 27 | void syntax(char *prg) |
27 | void syntax(char *prg) |
| 28 | { |
28 | { |
| 29 | printf("%s ELF-file\n", prg); |
29 | printf("%s ELF-file\n", prg); |
| 30 | exit(1); |
30 | exit(1); |
| 31 | } |
31 | } |
| 32 | 32 | ||
| 33 | void error(char *msg) |
33 | void error(char *msg) |
| 34 | { |
34 | { |
| 35 | printf("Error: %s\n", msg); |
35 | printf("Error: %s\n", msg); |
| 36 | exit(2); |
36 | exit(2); |
| 37 | } |
37 | } |
| 38 | 38 | ||
| 39 | #define ELF_VMA (0x88/sizeof(unsigned long long)) |
39 | #define ELF_VMA (0x50/sizeof(unsigned long long)) |
| 40 | #define ELF_LMA (0x90/sizeof(unsigned long long)) |
40 | #define ELF_LMA (0x58/sizeof(unsigned long long)) |
| - | 41 | #define ELF_ENTRY (0x18/sizeof(unsigned long long)) |
|
| 41 | 42 | ||
| 42 | #define LENGTH 0x98 |
43 | #define LENGTH 0x98 |
| 43 | 44 | ||
| 44 | int main(int argc, char *argv[]) |
45 | int main(int argc, char *argv[]) |
| 45 | { |
46 | { |
| 46 | int fd; |
47 | int fd; |
| 47 | unsigned long long vma, lma; |
48 | unsigned long long vma, lma,entry; |
| 48 | unsigned long long *elf; |
49 | unsigned long long *elf; |
| 49 | 50 | ||
| 50 | if (argc != 2) |
51 | if (argc != 2) |
| 51 | syntax(argv[0]); |
52 | syntax(argv[0]); |
| 52 | 53 | ||
| 53 | fd = open(argv[1], O_RDWR); |
54 | fd = open(argv[1], O_RDWR); |
| 54 | if (fd == -1) |
55 | if (fd == -1) |
| 55 | error("open failed"); |
56 | error("open failed"); |
| 56 | 57 | ||
| 57 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
58 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
| 58 | if ((void *) elf == (void *) -1) |
59 | if ((void *) elf == (void *) -1) |
| 59 | error("map failed"); |
60 | error("map failed"); |
| 60 | 61 | ||
| 61 | vma = elf[ELF_VMA]; |
62 | /*vma = elf[ELF_VMA];*/ |
| 62 | lma = elf[ELF_LMA]; |
63 | lma = elf[ELF_LMA]; |
| 63 | elf[ELF_VMA] = lma; |
64 | elf[ELF_VMA] = lma; |
| - | 65 | entry = elf[ELF_ENTRY]; |
|
| - | 66 | entry &= ((~0LL)>>3); |
|
| - | 67 | elf[ELF_ENTRY] = entry; |
|
| - | 68 | elf[ELF_ENTRY] = 0x100000; |
|
| 64 | elf[ELF_LMA] = vma; |
69 | /*elf[ELF_LMA] = vma;*/ |
| 65 | 70 | ||
| 66 | if (munmap(elf, LENGTH) == -1) |
71 | if (munmap(elf, LENGTH) == -1) |
| 67 | error("munmap failed"); |
72 | error("munmap failed"); |
| 68 | 73 | ||
| 69 | if (close(fd) == -1) |
74 | if (close(fd) == -1) |
| 70 | error("close failed"); |
75 | error("close failed"); |
| 71 | 76 | ||
| 72 | return 0; |
77 | return 0; |
| 73 | } |
78 | } |
| 74 | 79 | ||