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1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License, or | |
5 | * (at your option) any later version. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | * | |
12 | * You should have received a copy of the GNU General Public License | |
13 | * along with this program; if not, write to the Free Software | |
14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
15 | * | |
16 | * Copyright (C) 2001 Rusty Russell. | |
17 | * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org) | |
18 | * Copyright (C) 2005 Thiemo Seufer | |
19 | */ | |
20 | ||
21 | #include <linux/elf.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/moduleloader.h> | |
25 | ||
26 | extern int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v); | |
27 | ||
28 | static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v) | |
29 | { | |
30 | *location = v; | |
31 | ||
32 | return 0; | |
33 | } | |
34 | ||
35 | static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v) | |
36 | { | |
37 | if (v % 4) { | |
38 | pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n", | |
39 | me->name); | |
40 | return -ENOEXEC; | |
41 | } | |
42 | ||
43 | if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { | |
44 | printk(KERN_ERR | |
45 | "module %s: relocation overflow\n", | |
46 | me->name); | |
47 | return -ENOEXEC; | |
48 | } | |
49 | ||
50 | *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff); | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v) | |
56 | { | |
57 | *location = (*location & 0xffff0000) | | |
70342287 | 58 | ((((long long) v + 0x8000LL) >> 16) & 0xffff); |
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59 | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v) | |
64 | { | |
65 | *location = (*location & 0xffff0000) | (v & 0xffff); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v) | |
71 | { | |
72 | *(Elf_Addr *)location = v; | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | static int apply_r_mips_higher_rela(struct module *me, u32 *location, | |
78 | Elf_Addr v) | |
79 | { | |
80 | *location = (*location & 0xffff0000) | | |
70342287 | 81 | ((((long long) v + 0x80008000LL) >> 32) & 0xffff); |
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82 | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int apply_r_mips_highest_rela(struct module *me, u32 *location, | |
87 | Elf_Addr v) | |
88 | { | |
89 | *location = (*location & 0xffff0000) | | |
70342287 | 90 | ((((long long) v + 0x800080008000LL) >> 48) & 0xffff); |
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91 | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int (*reloc_handlers_rela[]) (struct module *me, u32 *location, | |
96 | Elf_Addr v) = { | |
97 | [R_MIPS_NONE] = apply_r_mips_none, | |
98 | [R_MIPS_32] = apply_r_mips_32_rela, | |
99 | [R_MIPS_26] = apply_r_mips_26_rela, | |
100 | [R_MIPS_HI16] = apply_r_mips_hi16_rela, | |
101 | [R_MIPS_LO16] = apply_r_mips_lo16_rela, | |
102 | [R_MIPS_64] = apply_r_mips_64_rela, | |
103 | [R_MIPS_HIGHER] = apply_r_mips_higher_rela, | |
104 | [R_MIPS_HIGHEST] = apply_r_mips_highest_rela | |
105 | }; | |
106 | ||
107 | int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, | |
108 | unsigned int symindex, unsigned int relsec, | |
109 | struct module *me) | |
110 | { | |
111 | Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr; | |
112 | Elf_Sym *sym; | |
113 | u32 *location; | |
114 | unsigned int i; | |
115 | Elf_Addr v; | |
116 | int res; | |
117 | ||
118 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
119 | sechdrs[relsec].sh_info); | |
120 | ||
121 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
122 | /* This is where to make the change */ | |
123 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
124 | + rel[i].r_offset; | |
125 | /* This is the symbol it is referring to */ | |
126 | sym = (Elf_Sym *)sechdrs[symindex].sh_addr | |
127 | + ELF_MIPS_R_SYM(rel[i]); | |
128 | if (IS_ERR_VALUE(sym->st_value)) { | |
129 | /* Ignore unresolved weak symbol */ | |
130 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) | |
131 | continue; | |
132 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
133 | me->name, strtab + sym->st_name); | |
134 | return -ENOENT; | |
135 | } | |
136 | ||
137 | v = sym->st_value + rel[i].r_addend; | |
138 | ||
139 | res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v); | |
140 | if (res) | |
141 | return res; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } |