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1da177e4 LT |
1 | /* Kernel module help for SH. |
2 | ||
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
5 | the Free Software Foundation; either version 2 of the License, or | |
6 | (at your option) any later version. | |
7 | ||
8 | This program is distributed in the hope that it will be useful, | |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
12 | ||
13 | You should have received a copy of the GNU General Public License | |
14 | along with this program; if not, write to the Free Software | |
15 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
17 | #include <linux/moduleloader.h> | |
18 | #include <linux/elf.h> | |
19 | #include <linux/vmalloc.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/kernel.h> | |
23 | ||
24 | #if 0 | |
25 | #define DEBUGP printk | |
26 | #else | |
27 | #define DEBUGP(fmt...) | |
28 | #endif | |
29 | ||
30 | void *module_alloc(unsigned long size) | |
31 | { | |
32 | if (size == 0) | |
33 | return NULL; | |
34 | return vmalloc(size); | |
35 | } | |
36 | ||
37 | ||
38 | /* Free memory returned from module_alloc */ | |
39 | void module_free(struct module *mod, void *module_region) | |
40 | { | |
41 | vfree(module_region); | |
42 | /* FIXME: If module_region == mod->init_region, trim exception | |
43 | table entries. */ | |
44 | } | |
45 | ||
46 | /* We don't need anything special. */ | |
47 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
48 | Elf_Shdr *sechdrs, | |
49 | char *secstrings, | |
50 | struct module *mod) | |
51 | { | |
52 | return 0; | |
53 | } | |
54 | ||
55 | #define COPY_UNALIGNED_WORD(sw, tw, align) \ | |
56 | { \ | |
57 | void *__s = &(sw), *__t = &(tw); \ | |
58 | unsigned short *__s2 = __s, *__t2 = __t; \ | |
59 | unsigned char *__s1 = __s, *__t1 = __t; \ | |
60 | switch ((align)) \ | |
61 | { \ | |
62 | case 0: \ | |
63 | *(unsigned long *) __t = *(unsigned long *) __s; \ | |
64 | break; \ | |
65 | case 2: \ | |
66 | *__t2++ = *__s2++; \ | |
67 | *__t2 = *__s2; \ | |
68 | break; \ | |
69 | default: \ | |
70 | *__t1++ = *__s1++; \ | |
71 | *__t1++ = *__s1++; \ | |
72 | *__t1++ = *__s1++; \ | |
73 | *__t1 = *__s1; \ | |
74 | break; \ | |
75 | } \ | |
76 | } | |
77 | ||
78 | int apply_relocate_add(Elf32_Shdr *sechdrs, | |
79 | const char *strtab, | |
80 | unsigned int symindex, | |
81 | unsigned int relsec, | |
82 | struct module *me) | |
83 | { | |
84 | unsigned int i; | |
85 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
86 | Elf32_Sym *sym; | |
87 | Elf32_Addr relocation; | |
88 | uint32_t *location; | |
89 | uint32_t value; | |
90 | int align; | |
91 | ||
92 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
93 | sechdrs[relsec].sh_info); | |
94 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
95 | /* This is where to make the change */ | |
96 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
97 | + rel[i].r_offset; | |
98 | /* This is the symbol it is referring to. Note that all | |
99 | undefined symbols have been resolved. */ | |
100 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
101 | + ELF32_R_SYM(rel[i].r_info); | |
102 | relocation = sym->st_value + rel[i].r_addend; | |
103 | align = (int)location & 3; | |
104 | ||
105 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
106 | case R_SH_DIR32: | |
107 | COPY_UNALIGNED_WORD (*location, value, align); | |
108 | value += relocation; | |
109 | COPY_UNALIGNED_WORD (value, *location, align); | |
110 | break; | |
111 | case R_SH_REL32: | |
112 | relocation = (relocation - (Elf32_Addr) location); | |
113 | COPY_UNALIGNED_WORD (*location, value, align); | |
114 | value += relocation; | |
115 | COPY_UNALIGNED_WORD (value, *location, align); | |
116 | break; | |
117 | default: | |
118 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
119 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
120 | return -ENOEXEC; | |
121 | } | |
122 | } | |
123 | return 0; | |
124 | } | |
125 | ||
126 | int apply_relocate(Elf32_Shdr *sechdrs, | |
127 | const char *strtab, | |
128 | unsigned int symindex, | |
129 | unsigned int relsec, | |
130 | struct module *me) | |
131 | { | |
132 | printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", | |
133 | me->name); | |
134 | return -ENOEXEC; | |
135 | } | |
136 | ||
137 | int module_finalize(const Elf_Ehdr *hdr, | |
138 | const Elf_Shdr *sechdrs, | |
139 | struct module *me) | |
140 | { | |
141 | return 0; | |
142 | } | |
143 | ||
144 | void module_arch_cleanup(struct module *mod) | |
145 | { | |
146 | } |