]>
Commit | Line | Data |
---|---|---|
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 | 15 | #include <linux/kernel.h> |
27ac792c | 16 | #include <linux/mm.h> |
1da177e4 LT |
17 | #include <linux/elf.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/string.h> | |
22 | ||
23 | #include <asm/pgtable.h> | |
24 | ||
25 | #ifdef CONFIG_XIP_KERNEL | |
26 | /* | |
27 | * The XIP kernel text is mapped in the module area for modules and | |
28 | * some other stuff to work without any indirect relocations. | |
ab4f2ee1 | 29 | * MODULES_VADDR is redefined here and not in asm/memory.h to avoid |
1da177e4 LT |
30 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. |
31 | */ | |
32 | extern void _etext; | |
ab4f2ee1 RK |
33 | #undef MODULES_VADDR |
34 | #define MODULES_VADDR (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK) | |
1da177e4 LT |
35 | #endif |
36 | ||
6a570b28 | 37 | #ifdef CONFIG_MMU |
1da177e4 LT |
38 | void *module_alloc(unsigned long size) |
39 | { | |
40 | struct vm_struct *area; | |
41 | ||
42 | size = PAGE_ALIGN(size); | |
43 | if (!size) | |
44 | return NULL; | |
45 | ||
ab4f2ee1 | 46 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); |
1da177e4 LT |
47 | if (!area) |
48 | return NULL; | |
49 | ||
8ec53663 | 50 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); |
1da177e4 | 51 | } |
6a570b28 HC |
52 | #else /* CONFIG_MMU */ |
53 | void *module_alloc(unsigned long size) | |
54 | { | |
55 | return size == 0 ? NULL : vmalloc(size); | |
56 | } | |
57 | #endif /* !CONFIG_MMU */ | |
1da177e4 LT |
58 | |
59 | void module_free(struct module *module, void *region) | |
60 | { | |
61 | vfree(region); | |
62 | } | |
63 | ||
64 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
65 | Elf_Shdr *sechdrs, | |
66 | char *secstrings, | |
67 | struct module *mod) | |
68 | { | |
69 | return 0; | |
70 | } | |
71 | ||
72 | int | |
73 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, | |
74 | unsigned int relindex, struct module *module) | |
75 | { | |
76 | Elf32_Shdr *symsec = sechdrs + symindex; | |
77 | Elf32_Shdr *relsec = sechdrs + relindex; | |
78 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; | |
79 | Elf32_Rel *rel = (void *)relsec->sh_addr; | |
80 | unsigned int i; | |
81 | ||
82 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { | |
83 | unsigned long loc; | |
84 | Elf32_Sym *sym; | |
85 | s32 offset; | |
86 | ||
87 | offset = ELF32_R_SYM(rel->r_info); | |
88 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { | |
89 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", | |
90 | module->name, relindex, i); | |
91 | return -ENOEXEC; | |
92 | } | |
93 | ||
94 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; | |
95 | ||
96 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { | |
97 | printk(KERN_ERR "%s: out of bounds relocation, " | |
98 | "section %d reloc %d offset %d size %d\n", | |
99 | module->name, relindex, i, rel->r_offset, | |
100 | dstsec->sh_size); | |
101 | return -ENOEXEC; | |
102 | } | |
103 | ||
104 | loc = dstsec->sh_addr + rel->r_offset; | |
105 | ||
106 | switch (ELF32_R_TYPE(rel->r_info)) { | |
107 | case R_ARM_ABS32: | |
108 | *(u32 *)loc += sym->st_value; | |
109 | break; | |
110 | ||
111 | case R_ARM_PC24: | |
c2e26114 DJ |
112 | case R_ARM_CALL: |
113 | case R_ARM_JUMP24: | |
1da177e4 LT |
114 | offset = (*(u32 *)loc & 0x00ffffff) << 2; |
115 | if (offset & 0x02000000) | |
116 | offset -= 0x04000000; | |
117 | ||
118 | offset += sym->st_value - loc; | |
119 | if (offset & 3 || | |
c5f12503 KW |
120 | offset <= (s32)0xfe000000 || |
121 | offset >= (s32)0x02000000) { | |
1da177e4 LT |
122 | printk(KERN_ERR |
123 | "%s: relocation out of range, section " | |
124 | "%d reloc %d sym '%s'\n", module->name, | |
125 | relindex, i, strtab + sym->st_name); | |
126 | return -ENOEXEC; | |
127 | } | |
128 | ||
129 | offset >>= 2; | |
130 | ||
131 | *(u32 *)loc &= 0xff000000; | |
132 | *(u32 *)loc |= offset & 0x00ffffff; | |
133 | break; | |
134 | ||
135 | default: | |
136 | printk(KERN_ERR "%s: unknown relocation: %u\n", | |
137 | module->name, ELF32_R_TYPE(rel->r_info)); | |
138 | return -ENOEXEC; | |
139 | } | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | int | |
145 | apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, | |
146 | unsigned int symindex, unsigned int relsec, struct module *module) | |
147 | { | |
148 | printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", | |
149 | module->name); | |
150 | return -ENOEXEC; | |
151 | } | |
152 | ||
153 | int | |
154 | module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
155 | struct module *module) | |
156 | { | |
157 | return 0; | |
158 | } | |
159 | ||
160 | void | |
161 | module_arch_cleanup(struct module *mod) | |
162 | { | |
163 | } |