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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f6b165c6 MS |
2 | /* |
3 | * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> | |
4 | * Copyright (C) 2007-2009 PetaLogix | |
f6b165c6 MS |
5 | */ |
6 | ||
d64af918 | 7 | #include <linux/export.h> |
f6b165c6 MS |
8 | #include <linux/moduleloader.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/elf.h> | |
11 | #include <linux/vmalloc.h> | |
f6b165c6 MS |
12 | #include <linux/fs.h> |
13 | #include <linux/string.h> | |
ca5999fd | 14 | #include <linux/pgtable.h> |
65fddcfc | 15 | |
a5e48b88 | 16 | #include <asm/cacheflush.h> |
f6b165c6 | 17 | |
f6b165c6 MS |
18 | int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
19 | unsigned int symindex, unsigned int relsec, struct module *module) | |
20 | { | |
21 | ||
22 | unsigned int i; | |
23 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
24 | Elf32_Sym *sym; | |
25 | unsigned long int *location; | |
f6b165c6 | 26 | unsigned long int value; |
f6b165c6 MS |
27 | |
28 | pr_debug("Applying add relocation section %u to %u\n", | |
29 | relsec, sechdrs[relsec].sh_info); | |
30 | ||
31 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
32 | ||
33 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + | |
34 | rela[i].r_offset; | |
35 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + | |
36 | ELF32_R_SYM(rela[i].r_info); | |
37 | value = sym->st_value + rela[i].r_addend; | |
38 | ||
39 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
40 | ||
41 | /* | |
42 | * Be careful! mb-gcc / mb-ld splits the relocs between the | |
43 | * text and the reloc table. In general this means we must | |
44 | * read the current contents of (*location), add any offset | |
45 | * then store the result back in | |
46 | */ | |
47 | ||
48 | case R_MICROBLAZE_32: | |
f6b165c6 | 49 | *location = value; |
f6b165c6 MS |
50 | break; |
51 | ||
52 | case R_MICROBLAZE_64: | |
f6b165c6 MS |
53 | location[0] = (location[0] & 0xFFFF0000) | |
54 | (value >> 16); | |
55 | location[1] = (location[1] & 0xFFFF0000) | | |
56 | (value & 0xFFFF); | |
f6b165c6 MS |
57 | break; |
58 | ||
59 | case R_MICROBLAZE_64_PCREL: | |
fadf2e60 | 60 | value -= (unsigned long int)(location) + 4; |
f6b165c6 MS |
61 | location[0] = (location[0] & 0xFFFF0000) | |
62 | (value >> 16); | |
63 | location[1] = (location[1] & 0xFFFF0000) | | |
64 | (value & 0xFFFF); | |
65 | pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", | |
66 | value); | |
67 | break; | |
68 | ||
fadf2e60 JW |
69 | case R_MICROBLAZE_32_PCREL_LO: |
70 | pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); | |
71 | break; | |
72 | ||
679711b8 | 73 | case R_MICROBLAZE_64_NONE: |
f5b778be | 74 | pr_debug("R_MICROBLAZE_64_NONE\n"); |
679711b8 MS |
75 | break; |
76 | ||
f6b165c6 MS |
77 | case R_MICROBLAZE_NONE: |
78 | pr_debug("R_MICROBLAZE_NONE\n"); | |
79 | break; | |
80 | ||
81 | default: | |
6bd55f0b | 82 | pr_err("module %s: Unknown relocation: %u\n", |
f6b165c6 | 83 | module->name, |
fadf2e60 | 84 | ELF32_R_TYPE(rela[i].r_info)); |
f6b165c6 MS |
85 | return -ENOEXEC; |
86 | } | |
87 | } | |
88 | return 0; | |
89 | } | |
90 | ||
91 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
92 | struct module *module) | |
93 | { | |
a5e48b88 | 94 | flush_dcache(); |
f6b165c6 MS |
95 | return 0; |
96 | } |