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5a2bbb8f JB |
1 | /* |
2 | * OpenRISC module.c | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
8 | * Modifications for the OpenRISC architecture: | |
9 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/moduleloader.h> | |
18 | #include <linux/elf.h> | |
19 | ||
20 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
21 | const char *strtab, | |
22 | unsigned int symindex, | |
23 | unsigned int relsec, | |
24 | struct module *me) | |
25 | { | |
26 | unsigned int i; | |
27 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
28 | Elf32_Sym *sym; | |
29 | uint32_t *location; | |
30 | uint32_t value; | |
31 | ||
32 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
33 | sechdrs[relsec].sh_info); | |
34 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
35 | /* This is where to make the change */ | |
36 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
37 | + rel[i].r_offset; | |
38 | ||
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 | value = sym->st_value + rel[i].r_addend; | |
44 | ||
45 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
46 | case R_OR32_32: | |
47 | *location = value; | |
48 | break; | |
49 | case R_OR32_CONST: | |
56aea88d | 50 | *((uint16_t *)location + 1) = value; |
5a2bbb8f JB |
51 | break; |
52 | case R_OR32_CONSTH: | |
56aea88d | 53 | *((uint16_t *)location + 1) = value >> 16; |
5a2bbb8f JB |
54 | break; |
55 | case R_OR32_JUMPTARG: | |
56 | value -= (uint32_t)location; | |
57 | value >>= 2; | |
58 | value &= 0x03ffffff; | |
59 | value |= *location & 0xfc000000; | |
60 | *location = value; | |
61 | break; | |
62 | default: | |
63 | pr_err("module %s: Unknown relocation: %u\n", | |
64 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
69 | return 0; | |
70 | } |