1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public |
3 | * License. See the file COPYING in the main directory of this archive |
4 | * for more details. |
5 | */ |
6 | |
7 | #include <linux/moduleloader.h> |
8 | #include <linux/elf.h> |
9 | #include <linux/vmalloc.h> |
10 | #include <linux/fs.h> |
11 | #include <linux/string.h> |
12 | #include <linux/kernel.h> |
13 | |
14 | #if 0 |
15 | #define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
16 | #else |
17 | #define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) |
18 | #endif |
19 | |
20 | #ifdef CONFIG_MODULES |
21 | |
22 | int apply_relocate(Elf32_Shdr *sechdrs, |
23 | const char *strtab, |
24 | unsigned int symindex, |
25 | unsigned int relsec, |
26 | struct module *me) |
27 | { |
28 | unsigned int i; |
29 | Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; |
30 | Elf32_Sym *sym; |
31 | uint32_t *location; |
32 | |
33 | DEBUGP("Applying relocate section %u to %u\n" , relsec, |
34 | sechdrs[relsec].sh_info); |
35 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
36 | /* This is where to make the change */ |
37 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
38 | + rel[i].r_offset; |
39 | /* This is the symbol it is referring to. Note that all |
40 | undefined symbols have been resolved. */ |
41 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
42 | + ELF32_R_SYM(rel[i].r_info); |
43 | |
44 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
45 | case R_68K_32: |
46 | /* We add the value into the location given */ |
47 | *location += sym->st_value; |
48 | break; |
49 | case R_68K_PC32: |
50 | /* Add the value, subtract its position */ |
51 | *location += sym->st_value - (uint32_t)location; |
52 | break; |
53 | default: |
54 | pr_err("module %s: Unknown relocation: %u\n" , me->name, |
55 | ELF32_R_TYPE(rel[i].r_info)); |
56 | return -ENOEXEC; |
57 | } |
58 | } |
59 | return 0; |
60 | } |
61 | |
62 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
63 | const char *strtab, |
64 | unsigned int symindex, |
65 | unsigned int relsec, |
66 | struct module *me) |
67 | { |
68 | unsigned int i; |
69 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
70 | Elf32_Sym *sym; |
71 | uint32_t *location; |
72 | |
73 | DEBUGP("Applying relocate_add section %u to %u\n" , relsec, |
74 | sechdrs[relsec].sh_info); |
75 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
76 | /* This is where to make the change */ |
77 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
78 | + rel[i].r_offset; |
79 | /* This is the symbol it is referring to. Note that all |
80 | undefined symbols have been resolved. */ |
81 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
82 | + ELF32_R_SYM(rel[i].r_info); |
83 | |
84 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
85 | case R_68K_32: |
86 | /* We add the value into the location given */ |
87 | *location = rel[i].r_addend + sym->st_value; |
88 | break; |
89 | case R_68K_PC32: |
90 | /* Add the value, subtract its position */ |
91 | *location = rel[i].r_addend + sym->st_value - (uint32_t)location; |
92 | break; |
93 | default: |
94 | pr_err("module %s: Unknown relocation: %u\n" , me->name, |
95 | ELF32_R_TYPE(rel[i].r_info)); |
96 | return -ENOEXEC; |
97 | } |
98 | } |
99 | return 0; |
100 | } |
101 | |
102 | int module_finalize(const Elf_Ehdr *hdr, |
103 | const Elf_Shdr *sechdrs, |
104 | struct module *mod) |
105 | { |
106 | module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end); |
107 | return 0; |
108 | } |
109 | |
110 | #endif /* CONFIG_MODULES */ |
111 | |
112 | void module_fixup(struct module *mod, struct m68k_fixup_info *start, |
113 | struct m68k_fixup_info *end) |
114 | { |
115 | #ifdef CONFIG_MMU |
116 | struct m68k_fixup_info *fixup; |
117 | |
118 | for (fixup = start; fixup < end; fixup++) { |
119 | switch (fixup->type) { |
120 | case m68k_fixup_memoffset: |
121 | *(u32 *)fixup->addr = m68k_memoffset; |
122 | break; |
123 | case m68k_fixup_vnode_shift: |
124 | *(u16 *)fixup->addr += m68k_virt_to_node_shift; |
125 | break; |
126 | } |
127 | } |
128 | #endif |
129 | } |
130 | |