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6bc9a396 CL |
1 | /* |
2 | * arch/score/kernel/module.c | |
3 | * | |
4 | * Score Processor version. | |
5 | * | |
6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
7 | * Chen Liqin <liqin.chen@sunplusct.com> | |
8 | * Lennox Wu <lennox.wu@sunplusct.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, see the file COPYING, or write | |
22 | * to the Free Software Foundation, Inc., | |
23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
24 | */ | |
25 | ||
9fb24cc5 | 26 | #include <linux/moduleloader.h> |
6bc9a396 CL |
27 | #include <linux/module.h> |
28 | #include <linux/vmalloc.h> | |
29 | ||
6bc9a396 CL |
30 | int apply_relocate(Elf_Shdr *sechdrs, const char *strtab, |
31 | unsigned int symindex, unsigned int relindex, | |
32 | struct module *me) | |
33 | { | |
34 | Elf32_Shdr *symsec = sechdrs + symindex; | |
35 | Elf32_Shdr *relsec = sechdrs + relindex; | |
36 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; | |
37 | Elf32_Rel *rel = (void *)relsec->sh_addr; | |
38 | unsigned int i; | |
39 | ||
40 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { | |
41 | unsigned long loc; | |
42 | Elf32_Sym *sym; | |
c6067472 | 43 | s32 r_offset; |
6bc9a396 | 44 | |
c6067472 AB |
45 | r_offset = ELF32_R_SYM(rel->r_info); |
46 | if ((r_offset < 0) || | |
47 | (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) { | |
6bc9a396 CL |
48 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", |
49 | me->name, relindex, i); | |
50 | return -ENOEXEC; | |
51 | } | |
52 | ||
c6067472 | 53 | sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset; |
6bc9a396 CL |
54 | |
55 | if ((rel->r_offset < 0) || | |
56 | (rel->r_offset > dstsec->sh_size - sizeof(u32))) { | |
57 | printk(KERN_ERR "%s: out of bounds relocation, " | |
58 | "section %d reloc %d offset %d size %d\n", | |
59 | me->name, relindex, i, rel->r_offset, | |
60 | dstsec->sh_size); | |
61 | return -ENOEXEC; | |
62 | } | |
63 | ||
64 | loc = dstsec->sh_addr + rel->r_offset; | |
65 | switch (ELF32_R_TYPE(rel->r_info)) { | |
66 | case R_SCORE_NONE: | |
67 | break; | |
68 | case R_SCORE_ABS32: | |
69 | *(unsigned long *)loc += sym->st_value; | |
70 | break; | |
71 | case R_SCORE_HI16: | |
72 | break; | |
73 | case R_SCORE_LO16: { | |
74 | unsigned long hi16_offset, offset; | |
75 | unsigned long uvalue; | |
76 | unsigned long temp, temp_hi; | |
77 | temp_hi = *((unsigned long *)loc - 1); | |
78 | temp = *(unsigned long *)loc; | |
79 | ||
80 | hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) | | |
81 | ((temp_hi) & 0x7fff)) >> 1; | |
82 | offset = ((temp >> 16 & 0x03) << 15) | | |
83 | ((temp & 0x7fff) >> 1); | |
84 | offset = (hi16_offset << 16) | (offset & 0xffff); | |
85 | uvalue = sym->st_value + offset; | |
86 | hi16_offset = (uvalue >> 16) << 1; | |
87 | ||
88 | temp_hi = ((temp_hi) & (~(0x37fff))) | | |
89 | (hi16_offset & 0x7fff) | | |
90 | ((hi16_offset << 1) & 0x30000); | |
91 | *((unsigned long *)loc - 1) = temp_hi; | |
92 | ||
93 | offset = (uvalue & 0xffff) << 1; | |
94 | temp = (temp & (~(0x37fff))) | (offset & 0x7fff) | | |
95 | ((offset << 1) & 0x30000); | |
96 | *(unsigned long *)loc = temp; | |
97 | break; | |
98 | } | |
99 | case R_SCORE_24: { | |
100 | unsigned long hi16_offset, offset; | |
101 | unsigned long uvalue; | |
102 | unsigned long temp; | |
103 | ||
104 | temp = *(unsigned long *)loc; | |
105 | offset = (temp & 0x03FF7FFE); | |
106 | hi16_offset = (offset & 0xFFFF0000); | |
107 | offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2; | |
108 | ||
109 | uvalue = (sym->st_value + offset) >> 1; | |
110 | uvalue = uvalue & 0x00ffffff; | |
111 | ||
112 | temp = (temp & 0xfc008001) | | |
113 | ((uvalue << 2) & 0x3ff0000) | | |
114 | ((uvalue & 0x3fff) << 1); | |
115 | *(unsigned long *)loc = temp; | |
116 | break; | |
117 | } | |
118 | default: | |
119 | printk(KERN_ERR "%s: unknown relocation: %u\n", | |
120 | me->name, ELF32_R_TYPE(rel->r_info)); | |
121 | return -ENOEXEC; | |
122 | } | |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
6bc9a396 CL |
128 | /* Given an address, look for it in the module exception tables. */ |
129 | const struct exception_table_entry *search_module_dbetables(unsigned long addr) | |
130 | { | |
c6067472 | 131 | return NULL; |
6bc9a396 | 132 | } |