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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 | void *module_alloc(unsigned long size) |
38 | { | |
39 | if (size == 0) | |
40 | return NULL; | |
4b59c973 PM |
41 | |
42 | return vmalloc_exec(size); | |
1da177e4 LT |
43 | } |
44 | ||
45 | ||
46 | /* Free memory returned from module_alloc */ | |
47 | void module_free(struct module *mod, void *module_region) | |
48 | { | |
49 | vfree(module_region); | |
1da177e4 LT |
50 | } |
51 | ||
52 | /* We don't need anything special. */ | |
53 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
54 | Elf_Shdr *sechdrs, | |
55 | char *secstrings, | |
56 | struct module *mod) | |
57 | { | |
58 | return 0; | |
59 | } | |
60 | ||
1da177e4 LT |
61 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
62 | const char *strtab, | |
63 | unsigned int symindex, | |
64 | unsigned int relsec, | |
65 | struct module *me) | |
66 | { | |
67 | unsigned int i; | |
68 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
69 | Elf32_Sym *sym; | |
70 | Elf32_Addr relocation; | |
71 | uint32_t *location; | |
72 | uint32_t value; | |
1da177e4 | 73 | |
1cb80fcf PM |
74 | pr_debug("Applying relocate section %u to %u\n", relsec, |
75 | sechdrs[relsec].sh_info); | |
1da177e4 LT |
76 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
77 | /* This is where to make the change */ | |
78 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
79 | + rel[i].r_offset; | |
80 | /* This is the symbol it is referring to. Note that all | |
81 | undefined symbols have been resolved. */ | |
82 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
83 | + ELF32_R_SYM(rel[i].r_info); | |
84 | relocation = sym->st_value + rel[i].r_addend; | |
1da177e4 | 85 | |
1cb80fcf PM |
86 | #ifdef CONFIG_SUPERH64 |
87 | /* For text addresses, bit2 of the st_other field indicates | |
88 | * whether the symbol is SHmedia (1) or SHcompact (0). If | |
89 | * SHmedia, the LSB of the symbol needs to be asserted | |
90 | * for the CPU to be in SHmedia mode when it starts executing | |
91 | * the branch target. */ | |
7cd0378e | 92 | relocation |= !!(sym->st_other & 4); |
1cb80fcf PM |
93 | #endif |
94 | ||
1da177e4 LT |
95 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
96 | case R_SH_DIR32: | |
1f9d2949 | 97 | value = get_unaligned(location); |
1da177e4 | 98 | value += relocation; |
1f9d2949 | 99 | put_unaligned(value, location); |
1da177e4 LT |
100 | break; |
101 | case R_SH_REL32: | |
1cb80fcf | 102 | relocation = (relocation - (Elf32_Addr) location); |
1f9d2949 | 103 | value = get_unaligned(location); |
1da177e4 | 104 | value += relocation; |
1f9d2949 | 105 | put_unaligned(value, location); |
1cb80fcf PM |
106 | break; |
107 | case R_SH_IMM_LOW16: | |
108 | *location = (*location & ~0x3fffc00) | | |
109 | ((relocation & 0xffff) << 10); | |
110 | break; | |
111 | case R_SH_IMM_MEDLOW16: | |
112 | *location = (*location & ~0x3fffc00) | | |
113 | (((relocation >> 16) & 0xffff) << 10); | |
114 | break; | |
115 | case R_SH_IMM_LOW16_PCREL: | |
116 | relocation -= (Elf32_Addr) location; | |
117 | *location = (*location & ~0x3fffc00) | | |
118 | ((relocation & 0xffff) << 10); | |
119 | break; | |
120 | case R_SH_IMM_MEDLOW16_PCREL: | |
121 | relocation -= (Elf32_Addr) location; | |
122 | *location = (*location & ~0x3fffc00) | | |
123 | (((relocation >> 16) & 0xffff) << 10); | |
1da177e4 LT |
124 | break; |
125 | default: | |
126 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
127 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
128 | return -ENOEXEC; | |
129 | } | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | int apply_relocate(Elf32_Shdr *sechdrs, | |
135 | const char *strtab, | |
136 | unsigned int symindex, | |
137 | unsigned int relsec, | |
138 | struct module *me) | |
139 | { | |
140 | printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", | |
141 | me->name); | |
142 | return -ENOEXEC; | |
143 | } | |
144 | ||
145 | int module_finalize(const Elf_Ehdr *hdr, | |
146 | const Elf_Shdr *sechdrs, | |
147 | struct module *me) | |
148 | { | |
5a3abba7 | 149 | int ret = 0; |
a6a2f2ad | 150 | |
5a3abba7 | 151 | ret |= module_dwarf_finalize(hdr, sechdrs, me); |
a6a2f2ad | 152 | |
5a3abba7 | 153 | return ret; |
1da177e4 LT |
154 | } |
155 | ||
156 | void module_arch_cleanup(struct module *mod) | |
157 | { | |
5a3abba7 | 158 | module_dwarf_cleanup(mod); |
1da177e4 | 159 | } |