1 /*
2 * linux/arch/arm/kernel/module.c
3 *
4 * Copyright (C) 2002 Russell King.
5 * Modified for nommu by Hyok S. Choi
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 */
13 #include <linux/module.h>
14 #include <linux/moduleloader.h>
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
36 #ifdef CONFIG_MMU
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 }
51 #else /* CONFIG_MMU */
52 void *module_alloc(unsigned long size)
53 {
54 return size == 0 ? NULL : vmalloc(size);
55 }
56 #endif /* !CONFIG_MMU */
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:
111 case R_ARM_CALL:
112 case R_ARM_JUMP24:
113 offset = (*(u32 *)loc & 0x00ffffff) << 2;
114 if (offset & 0x02000000)
115 offset -= 0x04000000;
116
117 offset += sym->st_value - loc;
118 if (offset & 3 ||
119 offset <= (s32)0xfe000000 ||
120 offset >= (s32)0x02000000) {
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 }
163
|
This page was automatically generated by the
LXR engine.
|