/*  Kernel module help for x86-64    Copyright (C) 2001 Rusty Russell.    Copyright (C) 2002,2003 Andi Kleen, SuSE Labs.    This program is free software; you can redistribute it and/or modify    it under the terms of the GNU General Public License as published by    the Free Software Foundation; either version 2 of the License, or    (at your option) any later version.    This program is distributed in the hope that it will be useful,    but WITHOUT ANY WARRANTY; without even the implied warranty of    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    GNU General Public License for more details.    You should have received a copy of the GNU General Public License    along with this program; if not, write to the Free Software    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*/#include <linux/moduleloader.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/kernel.h>#include <linux/slab.h>#include <asm/system.h>#include <asm/page.h>#include <asm/pgtable.h>#define DEBUGP(fmt...) #ifndef CONFIG_UMLvoid module_free(struct module *mod, void *module_region){	vfree(module_region);	/* FIXME: If module_region == mod->init_region, trim exception           table entries. */}void *module_alloc(unsigned long size){	struct vm_struct *area;	if (!size)		return NULL;	size = PAGE_ALIGN(size);	if (size > MODULES_LEN)		return NULL;	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);	if (!area)		return NULL;	return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);}#endif/* We don't need anything special. */int module_frob_arch_sections(Elf_Ehdr *hdr,			      Elf_Shdr *sechdrs,			      char *secstrings,			      struct module *mod){	return 0;}int apply_relocate_add(Elf64_Shdr *sechdrs,		   const char *strtab,		   unsigned int symindex,		   unsigned int relsec,		   struct module *me){	unsigned int i;	Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;	Elf64_Sym *sym;	void *loc;	u64 val; 	DEBUGP("Applying relocate section %u to %u\n", relsec,	       sechdrs[relsec].sh_info);	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {		/* This is where to make the change */		loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr			+ rel[i].r_offset;		/* This is the symbol it is referring to.  Note that all		   undefined symbols have been resolved.  */		sym = (Elf64_Sym *)sechdrs[symindex].sh_addr			+ ELF64_R_SYM(rel[i].r_info);	        DEBUGP("type %d st_value %Lx r_addend %Lx loc %Lx\n",		       (int)ELF64_R_TYPE(rel[i].r_info), 		       sym->st_value, rel[i].r_addend, (u64)loc);		val = sym->st_value + rel[i].r_addend; 		switch (ELF64_R_TYPE(rel[i].r_info)) {		case R_X86_64_NONE:			break;		case R_X86_64_64:			*(u64 *)loc = val;			break;		case R_X86_64_32:			*(u32 *)loc = val;			if (val != *(u32 *)loc)				goto overflow;			break;		case R_X86_64_32S:			*(s32 *)loc = val;			if ((s64)val != *(s32 *)loc)				goto overflow;			break;		case R_X86_64_PC32: 			val -= (u64)loc;			*(u32 *)loc = val;#if 0			if ((s64)val != *(s32 *)loc)				goto overflow; #endif			break;		default:			printk(KERN_ERR "module %s: Unknown rela relocation: %Lu\n",			       me->name, ELF64_R_TYPE(rel[i].r_info));			return -ENOEXEC;		}	}	return 0;overflow:	printk(KERN_ERR "overflow in relocation type %d val %Lx\n", 	       (int)ELF64_R_TYPE(rel[i].r_info), val);	printk(KERN_ERR "`%s' likely not compiled with -mcmodel=kernel\n",	       me->name);	return -ENOEXEC;}int apply_relocate(Elf_Shdr *sechdrs,		   const char *strtab,		   unsigned int symindex,		   unsigned int relsec,		   struct module *me){	printk("non add relocation not supported\n");	return -ENOSYS;} extern void apply_alternatives(void *start, void *end); int module_finalize(const Elf_Ehdr *hdr,		    const Elf_Shdr *sechdrs,		    struct module *me){	const Elf_Shdr *s;	char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;	/* look for .altinstructions to patch */ 	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 		void *seg; 				if (strcmp(".altinstructions", secstrings + s->sh_name))			continue;		seg = (void *)s->sh_addr; 		apply_alternatives(seg, seg + s->sh_size); 	} 		return 0;}void module_arch_cleanup(struct module *mod){}