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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> | |
14 | ||
ca5999fd | 15 | #include <linux/pgtable.h> |
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 MS |
26 | unsigned long int value; |
27 | #if __GNUC__ < 4 | |
28 | unsigned long int old_value; | |
29 | #endif | |
30 | ||
31 | pr_debug("Applying add relocation section %u to %u\n", | |
32 | relsec, sechdrs[relsec].sh_info); | |
33 | ||
34 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
35 | ||
36 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + | |
37 | rela[i].r_offset; | |
38 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + | |
39 | ELF32_R_SYM(rela[i].r_info); | |
40 | value = sym->st_value + rela[i].r_addend; | |
41 | ||
42 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
43 | ||
44 | /* | |
45 | * Be careful! mb-gcc / mb-ld splits the relocs between the | |
46 | * text and the reloc table. In general this means we must | |
47 | * read the current contents of (*location), add any offset | |
48 | * then store the result back in | |
49 | */ | |
50 | ||
51 | case R_MICROBLAZE_32: | |
52 | #if __GNUC__ < 4 | |
53 | old_value = *location; | |
54 | *location = value + old_value; | |
55 | ||
56 | pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n", | |
57 | old_value, value); | |
58 | #else | |
59 | *location = value; | |
60 | #endif | |
61 | break; | |
62 | ||
63 | case R_MICROBLAZE_64: | |
64 | #if __GNUC__ < 4 | |
65 | /* Split relocs only required/used pre gcc4.1.1 */ | |
66 | old_value = ((location[0] & 0x0000FFFF) << 16) | | |
67 | (location[1] & 0x0000FFFF); | |
68 | value += old_value; | |
69 | #endif | |
70 | location[0] = (location[0] & 0xFFFF0000) | | |
71 | (value >> 16); | |
72 | location[1] = (location[1] & 0xFFFF0000) | | |
73 | (value & 0xFFFF); | |
74 | #if __GNUC__ < 4 | |
75 | pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n", | |
76 | old_value, value); | |
77 | #endif | |
78 | break; | |
79 | ||
80 | case R_MICROBLAZE_64_PCREL: | |
fadf2e60 JW |
81 | #if __GNUC__ < 4 |
82 | old_value = (location[0] & 0xFFFF) << 16 | | |
f6b165c6 | 83 | (location[1] & 0xFFFF); |
fadf2e60 JW |
84 | value -= old_value; |
85 | #endif | |
86 | value -= (unsigned long int)(location) + 4; | |
f6b165c6 MS |
87 | location[0] = (location[0] & 0xFFFF0000) | |
88 | (value >> 16); | |
89 | location[1] = (location[1] & 0xFFFF0000) | | |
90 | (value & 0xFFFF); | |
91 | pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", | |
92 | value); | |
93 | break; | |
94 | ||
fadf2e60 JW |
95 | case R_MICROBLAZE_32_PCREL_LO: |
96 | pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); | |
97 | break; | |
98 | ||
679711b8 | 99 | case R_MICROBLAZE_64_NONE: |
f5b778be | 100 | pr_debug("R_MICROBLAZE_64_NONE\n"); |
679711b8 MS |
101 | break; |
102 | ||
f6b165c6 MS |
103 | case R_MICROBLAZE_NONE: |
104 | pr_debug("R_MICROBLAZE_NONE\n"); | |
105 | break; | |
106 | ||
107 | default: | |
6bd55f0b | 108 | pr_err("module %s: Unknown relocation: %u\n", |
f6b165c6 | 109 | module->name, |
fadf2e60 | 110 | ELF32_R_TYPE(rela[i].r_info)); |
f6b165c6 MS |
111 | return -ENOEXEC; |
112 | } | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
117 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
118 | struct module *module) | |
119 | { | |
a5e48b88 | 120 | flush_dcache(); |
f6b165c6 MS |
121 | return 0; |
122 | } |