/* *  linux/arch/arm/kernel/module.c * *  Copyright (C) 2002 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Module allocation method suggested by Andi Kleen. */#include <linux/config.h>#include <linux/module.h>#include <linux/moduleloader.h>#include <linux/kernel.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/slab.h>#include <linux/fs.h>#include <linux/string.h>#include <asm/pgtable.h>#ifdef CONFIG_XIP_KERNEL/* * The XIP kernel text is mapped in the module area for modules and * some other stuff to work without any indirect relocations. * MODULE_START is redefined here and not in asm/memory.h to avoid * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. */extern void _etext;#undef MODULE_START#define MODULE_START	(((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)#endifvoid *module_alloc(unsigned long size){	struct vm_struct *area;	size = PAGE_ALIGN(size);	if (!size)		return NULL;	area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);	if (!area)		return NULL;	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);}void module_free(struct module *module, void *region){	vfree(region);}int module_frob_arch_sections(Elf_Ehdr *hdr,			      Elf_Shdr *sechdrs,			      char *secstrings,			      struct module *mod){	return 0;}intapply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,	       unsigned int relindex, struct module *module){	Elf32_Shdr *symsec = sechdrs + symindex;	Elf32_Shdr *relsec = sechdrs + relindex;	Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;	Elf32_Rel *rel = (void *)relsec->sh_addr;	unsigned int i;	for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {		unsigned long loc;		Elf32_Sym *sym;		s32 offset;		offset = ELF32_R_SYM(rel->r_info);		if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {			printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",				module->name, relindex, i);			return -ENOEXEC;		}		sym = ((Elf32_Sym *)symsec->sh_addr) + offset;		if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {			printk(KERN_ERR "%s: out of bounds relocation, "				"section %d reloc %d offset %d size %d\n",				module->name, relindex, i, rel->r_offset,				dstsec->sh_size);			return -ENOEXEC;		}		loc = dstsec->sh_addr + rel->r_offset;		switch (ELF32_R_TYPE(rel->r_info)) {		case R_ARM_ABS32:			*(u32 *)loc += sym->st_value;			break;		case R_ARM_PC24:		case R_ARM_CALL:		case R_ARM_JUMP24:			offset = (*(u32 *)loc & 0x00ffffff) << 2;			if (offset & 0x02000000)				offset -= 0x04000000;			offset += sym->st_value - loc;			if (offset & 3 ||			    offset <= (s32)0xfc000000 ||			    offset >= (s32)0x04000000) {				printk(KERN_ERR				       "%s: relocation out of range, section "				       "%d reloc %d sym '%s'\n", module->name,				       relindex, i, strtab + sym->st_name);				return -ENOEXEC;			}			offset >>= 2;			*(u32 *)loc &= 0xff000000;			*(u32 *)loc |= offset & 0x00ffffff;			break;		default:			printk(KERN_ERR "%s: unknown relocation: %u\n",			       module->name, ELF32_R_TYPE(rel->r_info));			return -ENOEXEC;		}	}	return 0;}intapply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,		   unsigned int symindex, unsigned int relsec, struct module *module){	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",	       module->name);	return -ENOEXEC;}intmodule_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,		struct module *module){	return 0;}voidmodule_arch_cleanup(struct module *mod){}