/* * linux/arch/unicore32/kernel/module.c * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * 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. */#include <linux/module.h>#include <linux/moduleloader.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/gfp.h> #include <asm/pgtable.h>#include <asm/sections.h> void *module_alloc(unsigned long size){	struct vm_struct *area; 	size = PAGE_ALIGN(size);	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);	if (!area)		return NULL; 	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);} 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_UNICORE_NONE:			/* ignore */			break; 		case R_UNICORE_ABS32:			*(u32 *)loc += sym->st_value;			break; 		case R_UNICORE_PC24:		case R_UNICORE_CALL:		case R_UNICORE_JUMP24:			offset = (*(u32 *)loc & 0x00ffffff) << 2;			if (offset & 0x02000000)				offset -= 0x04000000; 			offset += sym->st_value - loc;			if (offset & 3 ||			    offset <= (s32)0xfe000000 ||			    offset >= (s32)0x02000000) {				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;}