Rev 872 | Only display areas with differences | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 872 | Rev 1334 | ||
---|---|---|---|
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 <stdlib.h> |
|
21 | #include <sys/types.h> |
22 | #include <sys/types.h> |
22 | #include <sys/stat.h> |
23 | #include <sys/stat.h> |
23 | #include <sys/mman.h> |
24 | #include <sys/mman.h> |
24 | #include <unistd.h> |
25 | #include <unistd.h> |
25 | #include <fcntl.h> |
26 | #include <fcntl.h> |
26 | 27 | ||
27 | void syntax(char *prg) |
28 | void syntax(char *prg) |
28 | { |
29 | { |
29 | printf("%s ELF-file\n", prg); |
30 | printf("%s ELF-file\n", prg); |
30 | exit(1); |
31 | exit(1); |
31 | } |
32 | } |
32 | 33 | ||
33 | void error(char *msg) |
34 | void error(char *msg) |
34 | { |
35 | { |
35 | printf("Error: %s\n", msg); |
36 | printf("Error: %s\n", msg); |
36 | exit(2); |
37 | exit(2); |
37 | } |
38 | } |
38 | 39 | ||
39 | #define ELF_VMA (0x50/sizeof(unsigned long long)) |
40 | #define ELF_VMA (0x50/sizeof(unsigned long long)) |
40 | #define ELF_LMA (0x58/sizeof(unsigned long long)) |
41 | #define ELF_LMA (0x58/sizeof(unsigned long long)) |
41 | #define ELF_ENTRY (0x18/sizeof(unsigned long long)) |
42 | #define ELF_ENTRY (0x18/sizeof(unsigned long long)) |
42 | 43 | ||
43 | #define LENGTH 0x98 |
44 | #define LENGTH 0x98 |
44 | 45 | ||
45 | int main(int argc, char *argv[]) |
46 | int main(int argc, char *argv[]) |
46 | { |
47 | { |
47 | int fd; |
48 | int fd; |
48 | unsigned long long vma, lma,entry; |
49 | unsigned long long vma, lma,entry; |
49 | unsigned long long *elf; |
50 | unsigned long long *elf; |
50 | 51 | ||
51 | if (argc != 2) |
52 | if (argc != 2) |
52 | syntax(argv[0]); |
53 | syntax(argv[0]); |
53 | 54 | ||
54 | fd = open(argv[1], O_RDWR); |
55 | fd = open(argv[1], O_RDWR); |
55 | if (fd == -1) |
56 | if (fd == -1) |
56 | error("open failed"); |
57 | error("open failed"); |
57 | 58 | ||
58 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
59 | elf = mmap(NULL, LENGTH, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
59 | if ((void *) elf == (void *) -1) |
60 | if ((void *) elf == (void *) -1) |
60 | error("map failed"); |
61 | error("map failed"); |
61 | 62 | ||
62 | lma = elf[ELF_LMA]; |
63 | lma = elf[ELF_LMA]; |
63 | elf[ELF_VMA] = lma; |
64 | elf[ELF_VMA] = lma; |
64 | entry = lma; |
65 | entry = lma; |
65 | elf[ELF_ENTRY] = entry; |
66 | elf[ELF_ENTRY] = entry; |
66 | 67 | ||
67 | if (munmap(elf, LENGTH) == -1) |
68 | if (munmap(elf, LENGTH) == -1) |
68 | error("munmap failed"); |
69 | error("munmap failed"); |
69 | 70 | ||
70 | if (close(fd) == -1) |
71 | if (close(fd) == -1) |
71 | error("close failed"); |
72 | error("close failed"); |
72 | 73 | ||
73 | return 0; |
74 | return 0; |
74 | } |
75 | } |
75 | 76 |