1 | // SPDX-License-Identifier: GPL-2.0-or-later |
---|---|
2 | /* |
3 | * OpenRISC module.c |
4 | * |
5 | * Linux architectural port borrowing liberally from similar works of |
6 | * others. All original copyrights apply as per the original source |
7 | * declaration. |
8 | * |
9 | * Modifications for the OpenRISC architecture: |
10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
11 | */ |
12 | |
13 | #include <linux/moduleloader.h> |
14 | #include <linux/elf.h> |
15 | |
16 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
17 | const char *strtab, |
18 | unsigned int symindex, |
19 | unsigned int relsec, |
20 | struct module *me) |
21 | { |
22 | unsigned int i; |
23 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
24 | Elf32_Sym *sym; |
25 | uint32_t *location; |
26 | uint32_t value; |
27 | |
28 | pr_debug("Applying relocate section %u to %u\n", relsec, |
29 | sechdrs[relsec].sh_info); |
30 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
31 | /* This is where to make the change */ |
32 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
33 | + rel[i].r_offset; |
34 | |
35 | /* This is the symbol it is referring to. Note that all |
36 | undefined symbols have been resolved. */ |
37 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
38 | + ELF32_R_SYM(rel[i].r_info); |
39 | value = sym->st_value + rel[i].r_addend; |
40 | |
41 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
42 | case R_OR32_32: |
43 | *location = value; |
44 | break; |
45 | case R_OR32_CONST: |
46 | *((uint16_t *)location + 1) = value; |
47 | break; |
48 | case R_OR32_CONSTH: |
49 | *((uint16_t *)location + 1) = value >> 16; |
50 | break; |
51 | case R_OR32_JUMPTARG: |
52 | value -= (uint32_t)location; |
53 | value >>= 2; |
54 | value &= 0x03ffffff; |
55 | value |= *location & 0xfc000000; |
56 | *location = value; |
57 | break; |
58 | default: |
59 | pr_err("module %s: Unknown relocation: %u\n", |
60 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
61 | break; |
62 | } |
63 | } |
64 | |
65 | return 0; |
66 | } |
67 |