/*  Kernel module help for i386.    Copyright (C) 2001 Rusty Russell.     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/bug.h> #if 0#define DEBUGP printk#else#define DEBUGP(fmt...)#endif void *module_alloc(unsigned long size){	if (size == 0)		return NULL;	return vmalloc_exec(size);}  /* Free memory returned from module_alloc */void module_free(struct module *mod, void *module_region){	vfree(module_region);	/* FIXME: If module_region == mod->init_region, trim exception           table entries. */} /* 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(Elf32_Shdr *sechdrs,		   const char *strtab,		   unsigned int symindex,		   unsigned int relsec,		   struct module *me){	unsigned int i;	Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr;	Elf32_Sym *sym;	uint32_t *location; 	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 */		location = (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 = (Elf32_Sym *)sechdrs[symindex].sh_addr			+ ELF32_R_SYM(rel[i].r_info); 		switch (ELF32_R_TYPE(rel[i].r_info)) {		case R_386_32:			/* We add the value into the location given */			*location += sym->st_value;			break;		case R_386_PC32:			/* Add the value, subtract its postition */			*location += sym->st_value - (uint32_t)location;			break;		default:			printk(KERN_ERR "module %s: Unknown relocation: %u\n",			       me->name, ELF32_R_TYPE(rel[i].r_info));			return -ENOEXEC;		}	}	return 0;} int apply_relocate_add(Elf32_Shdr *sechdrs,		       const char *strtab,		       unsigned int symindex,		       unsigned int relsec,		       struct module *me){	printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",	       me->name);	return -ENOEXEC;} int module_finalize(const Elf_Ehdr *hdr,		    const Elf_Shdr *sechdrs,		    struct module *me){	const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,		*para = NULL;	char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 		if (!strcmp(".text", secstrings + s->sh_name))			text = s;		if (!strcmp(".altinstructions", secstrings + s->sh_name))			alt = s;		if (!strcmp(".smp_locks", secstrings + s->sh_name))			locks= s;		if (!strcmp(".parainstructions", secstrings + s->sh_name))			para = s;	} 	if (alt) {		/* patch .altinstructions */		void *aseg = (void *)alt->sh_addr;		apply_alternatives(aseg, aseg + alt->sh_size);	}	if (locks && text) {		void *lseg = (void *)locks->sh_addr;		void *tseg = (void *)text->sh_addr;		alternatives_smp_module_add(me, me->name,					    lseg, lseg + locks->sh_size,					    tseg, tseg + text->sh_size);	} 	if (para) {		void *pseg = (void *)para->sh_addr;		apply_paravirt(pseg, pseg + para->sh_size);	} 	return module_bug_finalize(hdr, sechdrs, me);} void module_arch_cleanup(struct module *mod){	alternatives_smp_module_del(mod);	module_bug_cleanup(mod);}