Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/module.c | |
3 | * | |
4 | * Copyright (C) 2002 Russell King. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Module allocation method suggested by Andi Kleen. | |
11 | */ | |
1da177e4 | 12 | #include <linux/module.h> |
f339ab3d | 13 | #include <linux/moduleloader.h> |
1da177e4 LT |
14 | #include <linux/kernel.h> |
15 | #include <linux/elf.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/string.h> | |
20 | ||
21 | #include <asm/pgtable.h> | |
22 | ||
23 | #ifdef CONFIG_XIP_KERNEL | |
24 | /* | |
25 | * The XIP kernel text is mapped in the module area for modules and | |
26 | * some other stuff to work without any indirect relocations. | |
27 | * MODULE_START is redefined here and not in asm/memory.h to avoid | |
28 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. | |
29 | */ | |
30 | extern void _etext; | |
31 | #undef MODULE_START | |
32 | #define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK) | |
33 | #endif | |
34 | ||
35 | void *module_alloc(unsigned long size) | |
36 | { | |
37 | struct vm_struct *area; | |
38 | ||
39 | size = PAGE_ALIGN(size); | |
40 | if (!size) | |
41 | return NULL; | |
42 | ||
43 | area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END); | |
44 | if (!area) | |
45 | return NULL; | |
46 | ||
47 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); | |
48 | } | |
49 | ||
50 | void module_free(struct module *module, void *region) | |
51 | { | |
52 | vfree(region); | |
53 | } | |
54 | ||
55 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
56 | Elf_Shdr *sechdrs, | |
57 | char *secstrings, | |
58 | struct module *mod) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | ||
63 | int | |
64 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, | |
65 | unsigned int relindex, struct module *module) | |
66 | { | |
67 | Elf32_Shdr *symsec = sechdrs + symindex; | |
68 | Elf32_Shdr *relsec = sechdrs + relindex; | |
69 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; | |
70 | Elf32_Rel *rel = (void *)relsec->sh_addr; | |
71 | unsigned int i; | |
72 | ||
73 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { | |
74 | unsigned long loc; | |
75 | Elf32_Sym *sym; | |
76 | s32 offset; | |
77 | ||
78 | offset = ELF32_R_SYM(rel->r_info); | |
79 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { | |
80 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", | |
81 | module->name, relindex, i); | |
82 | return -ENOEXEC; | |
83 | } | |
84 | ||
85 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; | |
86 | ||
87 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { | |
88 | printk(KERN_ERR "%s: out of bounds relocation, " | |
89 | "section %d reloc %d offset %d size %d\n", | |
90 | module->name, relindex, i, rel->r_offset, | |
91 | dstsec->sh_size); | |
92 | return -ENOEXEC; | |
93 | } | |
94 | ||
95 | loc = dstsec->sh_addr + rel->r_offset; | |
96 | ||
97 | switch (ELF32_R_TYPE(rel->r_info)) { | |
98 | case R_ARM_ABS32: | |
99 | *(u32 *)loc += sym->st_value; | |
100 | break; | |
101 | ||
102 | case R_ARM_PC24: | |
c2e26114 DJ |
103 | case R_ARM_CALL: |
104 | case R_ARM_JUMP24: | |
1da177e4 LT |
105 | offset = (*(u32 *)loc & 0x00ffffff) << 2; |
106 | if (offset & 0x02000000) | |
107 | offset -= 0x04000000; | |
108 | ||
109 | offset += sym->st_value - loc; | |
110 | if (offset & 3 || | |
111 | offset <= (s32)0xfc000000 || | |
112 | offset >= (s32)0x04000000) { | |
113 | printk(KERN_ERR | |
114 | "%s: relocation out of range, section " | |
115 | "%d reloc %d sym '%s'\n", module->name, | |
116 | relindex, i, strtab + sym->st_name); | |
117 | return -ENOEXEC; | |
118 | } | |
119 | ||
120 | offset >>= 2; | |
121 | ||
122 | *(u32 *)loc &= 0xff000000; | |
123 | *(u32 *)loc |= offset & 0x00ffffff; | |
124 | break; | |
125 | ||
126 | default: | |
127 | printk(KERN_ERR "%s: unknown relocation: %u\n", | |
128 | module->name, ELF32_R_TYPE(rel->r_info)); | |
129 | return -ENOEXEC; | |
130 | } | |
131 | } | |
132 | return 0; | |
133 | } | |
134 | ||
135 | int | |
136 | apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, | |
137 | unsigned int symindex, unsigned int relsec, struct module *module) | |
138 | { | |
139 | printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", | |
140 | module->name); | |
141 | return -ENOEXEC; | |
142 | } | |
143 | ||
144 | int | |
145 | module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
146 | struct module *module) | |
147 | { | |
148 | return 0; | |
149 | } | |
150 | ||
151 | void | |
152 | module_arch_cleanup(struct module *mod) | |
153 | { | |
154 | } |