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1da177e4 LT |
1 | /* Kernel module help for SH. |
2 | ||
1cb80fcf PM |
3 | SHcompact version by Kaz Kojima and Paul Mundt. |
4 | ||
5 | SHmedia bits: | |
6 | ||
7 | Copyright 2004 SuperH (UK) Ltd | |
8 | Author: Richard Curnow | |
9 | ||
10 | Based on the sh version, and on code from the sh64-specific parts of | |
11 | modutils, originally written by Richard Curnow and Ben Gaster. | |
12 | ||
1da177e4 LT |
13 | This program is free software; you can redistribute it and/or modify |
14 | it under the terms of the GNU General Public License as published by | |
15 | the Free Software Foundation; either version 2 of the License, or | |
16 | (at your option) any later version. | |
17 | ||
18 | This program is distributed in the hope that it will be useful, | |
19 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | GNU General Public License for more details. | |
22 | ||
23 | You should have received a copy of the GNU General Public License | |
24 | along with this program; if not, write to the Free Software | |
25 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
26 | */ | |
27 | #include <linux/moduleloader.h> | |
28 | #include <linux/elf.h> | |
29 | #include <linux/vmalloc.h> | |
3108cf06 | 30 | #include <linux/bug.h> |
1da177e4 LT |
31 | #include <linux/fs.h> |
32 | #include <linux/string.h> | |
33 | #include <linux/kernel.h> | |
1f9d2949 | 34 | #include <asm/unaligned.h> |
a6a2f2ad | 35 | #include <asm/dwarf.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
38 | const char *strtab, | |
39 | unsigned int symindex, | |
40 | unsigned int relsec, | |
41 | struct module *me) | |
42 | { | |
43 | unsigned int i; | |
44 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
45 | Elf32_Sym *sym; | |
46 | Elf32_Addr relocation; | |
47 | uint32_t *location; | |
48 | uint32_t value; | |
1da177e4 | 49 | |
1cb80fcf PM |
50 | pr_debug("Applying relocate section %u to %u\n", relsec, |
51 | sechdrs[relsec].sh_info); | |
1da177e4 LT |
52 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
53 | /* This is where to make the change */ | |
54 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
55 | + rel[i].r_offset; | |
56 | /* This is the symbol it is referring to. Note that all | |
57 | undefined symbols have been resolved. */ | |
58 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
59 | + ELF32_R_SYM(rel[i].r_info); | |
60 | relocation = sym->st_value + rel[i].r_addend; | |
1da177e4 | 61 | |
1cb80fcf PM |
62 | #ifdef CONFIG_SUPERH64 |
63 | /* For text addresses, bit2 of the st_other field indicates | |
64 | * whether the symbol is SHmedia (1) or SHcompact (0). If | |
65 | * SHmedia, the LSB of the symbol needs to be asserted | |
66 | * for the CPU to be in SHmedia mode when it starts executing | |
67 | * the branch target. */ | |
7cd0378e | 68 | relocation |= !!(sym->st_other & 4); |
1cb80fcf PM |
69 | #endif |
70 | ||
1da177e4 | 71 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
78207ffd PM |
72 | case R_SH_NONE: |
73 | break; | |
1da177e4 | 74 | case R_SH_DIR32: |
1f9d2949 | 75 | value = get_unaligned(location); |
1da177e4 | 76 | value += relocation; |
1f9d2949 | 77 | put_unaligned(value, location); |
1da177e4 LT |
78 | break; |
79 | case R_SH_REL32: | |
1cb80fcf | 80 | relocation = (relocation - (Elf32_Addr) location); |
1f9d2949 | 81 | value = get_unaligned(location); |
1da177e4 | 82 | value += relocation; |
1f9d2949 | 83 | put_unaligned(value, location); |
1cb80fcf PM |
84 | break; |
85 | case R_SH_IMM_LOW16: | |
86 | *location = (*location & ~0x3fffc00) | | |
87 | ((relocation & 0xffff) << 10); | |
88 | break; | |
89 | case R_SH_IMM_MEDLOW16: | |
90 | *location = (*location & ~0x3fffc00) | | |
91 | (((relocation >> 16) & 0xffff) << 10); | |
92 | break; | |
93 | case R_SH_IMM_LOW16_PCREL: | |
94 | relocation -= (Elf32_Addr) location; | |
95 | *location = (*location & ~0x3fffc00) | | |
96 | ((relocation & 0xffff) << 10); | |
97 | break; | |
98 | case R_SH_IMM_MEDLOW16_PCREL: | |
99 | relocation -= (Elf32_Addr) location; | |
100 | *location = (*location & ~0x3fffc00) | | |
101 | (((relocation >> 16) & 0xffff) << 10); | |
1da177e4 LT |
102 | break; |
103 | default: | |
104 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
105 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
106 | return -ENOEXEC; | |
107 | } | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | int module_finalize(const Elf_Ehdr *hdr, |
113 | const Elf_Shdr *sechdrs, | |
114 | struct module *me) | |
115 | { | |
5a3abba7 | 116 | int ret = 0; |
a6a2f2ad | 117 | |
5a3abba7 | 118 | ret |= module_dwarf_finalize(hdr, sechdrs, me); |
a6a2f2ad | 119 | |
5a3abba7 | 120 | return ret; |
1da177e4 LT |
121 | } |
122 | ||
123 | void module_arch_cleanup(struct module *mod) | |
124 | { | |
5a3abba7 | 125 | module_dwarf_cleanup(mod); |
1da177e4 | 126 | } |