2 * linux/arch/arm/kernel/module.c
4 * Copyright (C) 2002 Russell King.
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.
10 * Module allocation method suggested by Andi Kleen.
12 #include <linux/module.h>
13 #include <linux/moduleloader.h>
14 #include <linux/kernel.h>
15 #include <linux/elf.h>
16 #include <linux/vmalloc.h>
17 #include <linux/slab.h>
19 #include <linux/string.h>
21 #include <asm/pgtable.h>
23 #ifdef CONFIG_XIP_KERNEL
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.
32 #define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
35 void *module_alloc(unsigned long size)
37 struct vm_struct *area;
39 size = PAGE_ALIGN(size);
43 area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);
47 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
50 void module_free(struct module *module, void *region)
55 int module_frob_arch_sections(Elf_Ehdr *hdr,
64 apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
65 unsigned int relindex, struct module *module)
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;
73 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
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);
85 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
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,
95 loc = dstsec->sh_addr + rel->r_offset;
97 switch (ELF32_R_TYPE(rel->r_info)) {
99 *(u32 *)loc += sym->st_value;
105 offset = (*(u32 *)loc & 0x00ffffff) << 2;
106 if (offset & 0x02000000)
107 offset -= 0x04000000;
109 offset += sym->st_value - loc;
111 offset <= (s32)0xfc000000 ||
112 offset >= (s32)0x04000000) {
114 "%s: relocation out of range, section "
115 "%d reloc %d sym '%s'\n", module->name,
116 relindex, i, strtab + sym->st_name);
122 *(u32 *)loc &= 0xff000000;
123 *(u32 *)loc |= offset & 0x00ffffff;
127 printk(KERN_ERR "%s: unknown relocation: %u\n",
128 module->name, ELF32_R_TYPE(rel->r_info));
136 apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
137 unsigned int symindex, unsigned int relsec, struct module *module)
139 printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
145 module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
146 struct module *module)
152 module_arch_cleanup(struct module *mod)