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f6b165c6 MS |
1 | /* |
2 | * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> | |
3 | * Copyright (C) 2007-2009 PetaLogix | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
d64af918 | 10 | #include <linux/export.h> |
f6b165c6 MS |
11 | #include <linux/moduleloader.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/elf.h> | |
14 | #include <linux/vmalloc.h> | |
f6b165c6 MS |
15 | #include <linux/fs.h> |
16 | #include <linux/string.h> | |
17 | ||
18 | #include <asm/pgtable.h> | |
a5e48b88 | 19 | #include <asm/cacheflush.h> |
f6b165c6 | 20 | |
f6b165c6 MS |
21 | int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
22 | unsigned int symindex, unsigned int relsec, struct module *module) | |
23 | { | |
24 | ||
25 | unsigned int i; | |
26 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; | |
27 | Elf32_Sym *sym; | |
28 | unsigned long int *location; | |
f6b165c6 MS |
29 | unsigned long int value; |
30 | #if __GNUC__ < 4 | |
31 | unsigned long int old_value; | |
32 | #endif | |
33 | ||
34 | pr_debug("Applying add relocation section %u to %u\n", | |
35 | relsec, sechdrs[relsec].sh_info); | |
36 | ||
37 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
38 | ||
39 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + | |
40 | rela[i].r_offset; | |
41 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + | |
42 | ELF32_R_SYM(rela[i].r_info); | |
43 | value = sym->st_value + rela[i].r_addend; | |
44 | ||
45 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
46 | ||
47 | /* | |
48 | * Be careful! mb-gcc / mb-ld splits the relocs between the | |
49 | * text and the reloc table. In general this means we must | |
50 | * read the current contents of (*location), add any offset | |
51 | * then store the result back in | |
52 | */ | |
53 | ||
54 | case R_MICROBLAZE_32: | |
55 | #if __GNUC__ < 4 | |
56 | old_value = *location; | |
57 | *location = value + old_value; | |
58 | ||
59 | pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n", | |
60 | old_value, value); | |
61 | #else | |
62 | *location = value; | |
63 | #endif | |
64 | break; | |
65 | ||
66 | case R_MICROBLAZE_64: | |
67 | #if __GNUC__ < 4 | |
68 | /* Split relocs only required/used pre gcc4.1.1 */ | |
69 | old_value = ((location[0] & 0x0000FFFF) << 16) | | |
70 | (location[1] & 0x0000FFFF); | |
71 | value += old_value; | |
72 | #endif | |
73 | location[0] = (location[0] & 0xFFFF0000) | | |
74 | (value >> 16); | |
75 | location[1] = (location[1] & 0xFFFF0000) | | |
76 | (value & 0xFFFF); | |
77 | #if __GNUC__ < 4 | |
78 | pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n", | |
79 | old_value, value); | |
80 | #endif | |
81 | break; | |
82 | ||
83 | case R_MICROBLAZE_64_PCREL: | |
fadf2e60 JW |
84 | #if __GNUC__ < 4 |
85 | old_value = (location[0] & 0xFFFF) << 16 | | |
f6b165c6 | 86 | (location[1] & 0xFFFF); |
fadf2e60 JW |
87 | value -= old_value; |
88 | #endif | |
89 | value -= (unsigned long int)(location) + 4; | |
f6b165c6 MS |
90 | location[0] = (location[0] & 0xFFFF0000) | |
91 | (value >> 16); | |
92 | location[1] = (location[1] & 0xFFFF0000) | | |
93 | (value & 0xFFFF); | |
94 | pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", | |
95 | value); | |
96 | break; | |
97 | ||
fadf2e60 JW |
98 | case R_MICROBLAZE_32_PCREL_LO: |
99 | pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); | |
100 | break; | |
101 | ||
679711b8 | 102 | case R_MICROBLAZE_64_NONE: |
f5b778be | 103 | pr_debug("R_MICROBLAZE_64_NONE\n"); |
679711b8 MS |
104 | break; |
105 | ||
f6b165c6 MS |
106 | case R_MICROBLAZE_NONE: |
107 | pr_debug("R_MICROBLAZE_NONE\n"); | |
108 | break; | |
109 | ||
110 | default: | |
6bd55f0b | 111 | pr_err("module %s: Unknown relocation: %u\n", |
f6b165c6 | 112 | module->name, |
fadf2e60 | 113 | ELF32_R_TYPE(rela[i].r_info)); |
f6b165c6 MS |
114 | return -ENOEXEC; |
115 | } | |
116 | } | |
117 | return 0; | |
118 | } | |
119 | ||
120 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
121 | struct module *module) | |
122 | { | |
a5e48b88 | 123 | flush_dcache(); |
f6b165c6 MS |
124 | return 0; |
125 | } |