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1 | #include <linux/moduleloader.h> |
2 | #include <linux/elf.h> |
3 | #include <linux/vmalloc.h> |
4 | #include <linux/fs.h> |
5 | #include <linux/string.h> |
6 | #include <linux/kernel.h> |
7 | |
8 | #if 0 |
9 | #define DEBUGP printk |
10 | #else |
11 | #define DEBUGP(fmt...) |
12 | #endif |
13 | |
14 | void *module_alloc(unsigned long size) |
15 | { |
16 | if (size == 0) |
17 | return NULL; |
18 | return vmalloc(size); |
19 | } |
20 | |
21 | |
22 | /* Free memory returned from module_alloc */ |
23 | void module_free(struct module *mod, void *module_region) |
24 | { |
25 | vfree(module_region); |
26 | } |
27 | |
28 | /* We don't need anything special. */ |
29 | int module_frob_arch_sections(Elf_Ehdr *hdr, |
30 | Elf_Shdr *sechdrs, |
31 | char *secstrings, |
32 | struct module *mod) |
33 | { |
34 | return 0; |
35 | } |
36 | |
37 | int apply_relocate(Elf32_Shdr *sechdrs, |
38 | const char *strtab, |
39 | unsigned int symindex, |
40 | unsigned int relsec, |
41 | struct module *me) |
42 | { |
43 | unsigned int i; |
44 | Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; |
45 | Elf32_Sym *sym; |
46 | uint32_t *location; |
47 | |
48 | DEBUGP("Applying relocate section %u to %u\n", relsec, |
49 | sechdrs[relsec].sh_info); |
50 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
51 | /* This is where to make the change */ |
52 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
53 | + rel[i].r_offset; |
54 | /* This is the symbol it is referring to. Note that all |
55 | undefined symbols have been resolved. */ |
56 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
57 | + ELF32_R_SYM(rel[i].r_info); |
58 | |
59 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
60 | case R_68K_32: |
61 | /* We add the value into the location given */ |
62 | *location += sym->st_value; |
63 | break; |
64 | case R_68K_PC32: |
65 | /* Add the value, subtract its postition */ |
66 | *location += sym->st_value - (uint32_t)location; |
67 | break; |
68 | default: |
69 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
70 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
71 | return -ENOEXEC; |
72 | } |
73 | } |
74 | return 0; |
75 | } |
76 | |
77 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
78 | const char *strtab, |
79 | unsigned int symindex, |
80 | unsigned int relsec, |
81 | struct module *me) |
82 | { |
83 | unsigned int i; |
84 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
85 | Elf32_Sym *sym; |
86 | uint32_t *location; |
87 | |
88 | DEBUGP("Applying relocate_add section %u to %u\n", relsec, |
89 | sechdrs[relsec].sh_info); |
90 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
91 | /* This is where to make the change */ |
92 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
93 | + rel[i].r_offset; |
94 | /* This is the symbol it is referring to. Note that all |
95 | undefined symbols have been resolved. */ |
96 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
97 | + ELF32_R_SYM(rel[i].r_info); |
98 | |
99 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
100 | case R_68K_32: |
101 | /* We add the value into the location given */ |
102 | *location = rel[i].r_addend + sym->st_value; |
103 | break; |
104 | case R_68K_PC32: |
105 | /* Add the value, subtract its postition */ |
106 | *location = rel[i].r_addend + sym->st_value - (uint32_t)location; |
107 | break; |
108 | default: |
109 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
110 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
111 | return -ENOEXEC; |
112 | } |
113 | } |
114 | return 0; |
115 | } |
116 | |
117 | int module_finalize(const Elf_Ehdr *hdr, |
118 | const Elf_Shdr *sechdrs, |
119 | struct module *me) |
120 | { |
121 | return 0; |
122 | } |
123 | |
124 | void module_arch_cleanup(struct module *mod) |
125 | { |
126 | } |
127 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9