/* * Kernel module support for Nios II. * * Copyright (C) 2004 Microtronix Datacom Ltd. *   Written by Wentao Xu <xuwentao@microtronix.com> * Copyright (C) 2001, 2003 Rusty Russell * * This file is subject to the terms and conditions of the GNU General * Public License.  See the file COPYING in the main directory of this * archive for more details. */ #include <linux/moduleloader.h>#include <linux/elf.h>#include <linux/mm.h>#include <linux/vmalloc.h>#include <linux/slab.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/kernel.h> #include <asm/cacheflush.h> /* * Modules should NOT be allocated with kmalloc for (obvious) reasons. * But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot reach * from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns * addresses in 0xc0000000) */void *module_alloc(unsigned long size){	if (size == 0)		return NULL;	return kmalloc(size, GFP_KERNEL);} /* Free memory returned from module_alloc */void module_memfree(void *module_region){	kfree(module_region);} int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,			unsigned int symindex, unsigned int relsec,			struct module *mod){	unsigned int i;	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; 	pr_debug("Applying relocate section %u to %u\n", relsec,		 sechdrs[relsec].sh_info); 	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {		/* This is where to make the change */		uint32_t word;		uint32_t *loc			= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr			   + rela[i].r_offset);		/* This is the symbol it is referring to.  Note that all		   undefined symbols have been resolved.  */		Elf32_Sym *sym			= ((Elf32_Sym *)sechdrs[symindex].sh_addr				+ ELF32_R_SYM(rela[i].r_info));		uint32_t v = sym->st_value + rela[i].r_addend; 		pr_debug("reltype %d 0x%x name:<%s>\n",			ELF32_R_TYPE(rela[i].r_info),			rela[i].r_offset, strtab + sym->st_name); 		switch (ELF32_R_TYPE(rela[i].r_info)) {		case R_NIOS2_NONE:			break;		case R_NIOS2_BFD_RELOC_32:			*loc += v;			break;		case R_NIOS2_PCREL16:			v -= (uint32_t)loc + 4;			if ((int32_t)v > 0x7fff ||				(int32_t)v < -(int32_t)0x8000) {				pr_err("module %s: relocation overflow\n",					mod->name);				return -ENOEXEC;			}			word = *loc;			*loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |				(word & 0x3f);			break;		case R_NIOS2_CALL26:			if (v & 3) {				pr_err("module %s: dangerous relocation\n",					mod->name);				return -ENOEXEC;			}			if ((v >> 28) != ((uint32_t)loc >> 28)) {				pr_err("module %s: relocation overflow\n",					mod->name);				return -ENOEXEC;			}			*loc = (*loc & 0x3f) | ((v >> 2) << 6);			break;		case R_NIOS2_HI16:			word = *loc;			*loc = ((((word >> 22) << 16) |				((v >> 16) & 0xffff)) << 6) | (word & 0x3f);			break;		case R_NIOS2_LO16:			word = *loc;			*loc = ((((word >> 22) << 16) | (v & 0xffff)) << 6) |					(word & 0x3f);			break;		case R_NIOS2_HIADJ16:			{				Elf32_Addr word2; 				word = *loc;				word2 = ((v >> 16) + ((v >> 15) & 1)) & 0xffff;				*loc = ((((word >> 22) << 16) | word2) << 6) |						(word & 0x3f);			}			break; 		default:			pr_err("module %s: Unknown reloc: %u\n",				mod->name, ELF32_R_TYPE(rela[i].r_info));			return -ENOEXEC;		}	} 	return 0;} int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,			struct module *me){	flush_cache_all();	return 0;}