modules: make arch's use default loader hooks
[linux-2.6.git] / arch / score / kernel / module.c
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
26 #include <linux/moduleloader.h>
27 #include <linux/module.h>
28 #include <linux/vmalloc.h>
29
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;
43                 s32 r_offset;
44
45                 r_offset = ELF32_R_SYM(rel->r_info);
46                 if ((r_offset < 0) ||
47                     (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
48                         printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
49                                 me->name, relindex, i);
50                                 return -ENOEXEC;
51                 }
52
53                 sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
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
128 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
129                 unsigned int symindex, unsigned int relsec,
130                 struct module *me)
131 {
132         /* Non-standard return value... most other arch's return -ENOEXEC
133          * for an unsupported relocation variant
134          */
135         return 0;
136 }
137
138 /* Given an address, look for it in the module exception tables. */
139 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
140 {
141         return NULL;
142 }