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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/module.c | |
3 | * | |
4 | * Copyright (C) 2002 Russell King. | |
6a570b28 | 5 | * Modified for nommu by Hyok S. Choi |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * Module allocation method suggested by Andi Kleen. | |
12 | */ | |
1da177e4 | 13 | #include <linux/module.h> |
f339ab3d | 14 | #include <linux/moduleloader.h> |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/elf.h> | |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/string.h> | |
21 | ||
22 | #include <asm/pgtable.h> | |
23 | ||
24 | #ifdef CONFIG_XIP_KERNEL | |
25 | /* | |
26 | * The XIP kernel text is mapped in the module area for modules and | |
27 | * some other stuff to work without any indirect relocations. | |
28 | * MODULE_START is redefined here and not in asm/memory.h to avoid | |
29 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. | |
30 | */ | |
31 | extern void _etext; | |
32 | #undef MODULE_START | |
33 | #define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK) | |
34 | #endif | |
35 | ||
6a570b28 | 36 | #ifdef CONFIG_MMU |
1da177e4 LT |
37 | void *module_alloc(unsigned long size) |
38 | { | |
39 | struct vm_struct *area; | |
40 | ||
41 | size = PAGE_ALIGN(size); | |
42 | if (!size) | |
43 | return NULL; | |
44 | ||
45 | area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END); | |
46 | if (!area) | |
47 | return NULL; | |
48 | ||
49 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); | |
50 | } | |
6a570b28 HC |
51 | #else /* CONFIG_MMU */ |
52 | void *module_alloc(unsigned long size) | |
53 | { | |
54 | return size == 0 ? NULL : vmalloc(size); | |
55 | } | |
56 | #endif /* !CONFIG_MMU */ | |
1da177e4 LT |
57 | |
58 | void module_free(struct module *module, void *region) | |
59 | { | |
60 | vfree(region); | |
61 | } | |
62 | ||
63 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
64 | Elf_Shdr *sechdrs, | |
65 | char *secstrings, | |
66 | struct module *mod) | |
67 | { | |
68 | return 0; | |
69 | } | |
70 | ||
71 | int | |
72 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, | |
73 | unsigned int relindex, struct module *module) | |
74 | { | |
75 | Elf32_Shdr *symsec = sechdrs + symindex; | |
76 | Elf32_Shdr *relsec = sechdrs + relindex; | |
77 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; | |
78 | Elf32_Rel *rel = (void *)relsec->sh_addr; | |
79 | unsigned int i; | |
80 | ||
81 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { | |
82 | unsigned long loc; | |
83 | Elf32_Sym *sym; | |
84 | s32 offset; | |
85 | ||
86 | offset = ELF32_R_SYM(rel->r_info); | |
87 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { | |
88 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", | |
89 | module->name, relindex, i); | |
90 | return -ENOEXEC; | |
91 | } | |
92 | ||
93 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; | |
94 | ||
95 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { | |
96 | printk(KERN_ERR "%s: out of bounds relocation, " | |
97 | "section %d reloc %d offset %d size %d\n", | |
98 | module->name, relindex, i, rel->r_offset, | |
99 | dstsec->sh_size); | |
100 | return -ENOEXEC; | |
101 | } | |
102 | ||
103 | loc = dstsec->sh_addr + rel->r_offset; | |
104 | ||
105 | switch (ELF32_R_TYPE(rel->r_info)) { | |
106 | case R_ARM_ABS32: | |
107 | *(u32 *)loc += sym->st_value; | |
108 | break; | |
109 | ||
110 | case R_ARM_PC24: | |
c2e26114 DJ |
111 | case R_ARM_CALL: |
112 | case R_ARM_JUMP24: | |
1da177e4 LT |
113 | offset = (*(u32 *)loc & 0x00ffffff) << 2; |
114 | if (offset & 0x02000000) | |
115 | offset -= 0x04000000; | |
116 | ||
117 | offset += sym->st_value - loc; | |
118 | if (offset & 3 || | |
c5f12503 KW |
119 | offset <= (s32)0xfe000000 || |
120 | offset >= (s32)0x02000000) { | |
1da177e4 LT |
121 | printk(KERN_ERR |
122 | "%s: relocation out of range, section " | |
123 | "%d reloc %d sym '%s'\n", module->name, | |
124 | relindex, i, strtab + sym->st_name); | |
125 | return -ENOEXEC; | |
126 | } | |
127 | ||
128 | offset >>= 2; | |
129 | ||
130 | *(u32 *)loc &= 0xff000000; | |
131 | *(u32 *)loc |= offset & 0x00ffffff; | |
132 | break; | |
133 | ||
134 | default: | |
135 | printk(KERN_ERR "%s: unknown relocation: %u\n", | |
136 | module->name, ELF32_R_TYPE(rel->r_info)); | |
137 | return -ENOEXEC; | |
138 | } | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | int | |
144 | apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, | |
145 | unsigned int symindex, unsigned int relsec, struct module *module) | |
146 | { | |
147 | printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", | |
148 | module->name); | |
149 | return -ENOEXEC; | |
150 | } | |
151 | ||
152 | int | |
153 | module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
154 | struct module *module) | |
155 | { | |
156 | return 0; | |
157 | } | |
158 | ||
159 | void | |
160 | module_arch_cleanup(struct module *mod) | |
161 | { | |
162 | } |