/* *  linux/arch/arm/kernel/module.c * *  Copyright (C) 2002 Russell King. *  Modified for nommu by Hyok S. Choi * * 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/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>#include <asm/unwind.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. * MODULES_VADDR is redefined here and not in asm/memory.h to avoid * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. */#undef MODULES_VADDR#define MODULES_VADDR	(((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK)#endif #ifdef CONFIG_MMUvoid *module_alloc(unsigned long size){	struct vm_struct *area; 	size = PAGE_ALIGN(size);	if (!size)		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);}#else /* CONFIG_MMU */void *module_alloc(unsigned long size){	return size == 0 ? NULL : vmalloc(size);}#endif /* !CONFIG_MMU */ 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){#ifdef CONFIG_ARM_UNWIND	Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;	struct arm_unwind_mapping *maps = mod->arch.map; 	for (s = sechdrs; s < sechdrs_end; s++) {		char const *secname = secstrings + s->sh_name; 		if (strcmp(".ARM.exidx.init.text", secname) == 0)			maps[ARM_SEC_INIT].unw_sec = s;		else if (strcmp(".ARM.exidx.devinit.text", secname) == 0)			maps[ARM_SEC_DEVINIT].unw_sec = s;		else if (strcmp(".ARM.exidx", secname) == 0)			maps[ARM_SEC_CORE].unw_sec = s;		else if (strcmp(".ARM.exidx.exit.text", secname) == 0)			maps[ARM_SEC_EXIT].unw_sec = s;		else if (strcmp(".ARM.exidx.devexit.text", secname) == 0)			maps[ARM_SEC_DEVEXIT].unw_sec = s;		else if (strcmp(".init.text", secname) == 0)			maps[ARM_SEC_INIT].sec_text = s;		else if (strcmp(".devinit.text", secname) == 0)			maps[ARM_SEC_DEVINIT].sec_text = s;		else if (strcmp(".text", secname) == 0)			maps[ARM_SEC_CORE].sec_text = s;		else if (strcmp(".exit.text", secname) == 0)			maps[ARM_SEC_EXIT].sec_text = s;		else if (strcmp(".devexit.text", secname) == 0)			maps[ARM_SEC_DEVEXIT].sec_text = s;	}#endif	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;#ifdef CONFIG_THUMB2_KERNEL		u32 upper, lower, sign, j1, j2;#endif 		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_NONE:			/* ignore */			break; 		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)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; 	       case R_ARM_V4BX:		       /* Preserve Rm and the condition code. Alter			* other bits to re-code instruction as			* MOV PC,Rm.			*/		       *(u32 *)loc &= 0xf000000f;		       *(u32 *)loc |= 0x01a0f000;		       break; 		case R_ARM_PREL31:			offset = *(u32 *)loc + sym->st_value - loc;			*(u32 *)loc = offset & 0x7fffffff;			break; 		case R_ARM_MOVW_ABS_NC:		case R_ARM_MOVT_ABS:			offset = *(u32 *)loc;			offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);			offset = (offset ^ 0x8000) - 0x8000; 			offset += sym->st_value;			if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)				offset >>= 16; 			*(u32 *)loc &= 0xfff0f000;			*(u32 *)loc |= ((offset & 0xf000) << 4) |					(offset & 0x0fff);			break; #ifdef CONFIG_THUMB2_KERNEL		case R_ARM_THM_CALL:		case R_ARM_THM_JUMP24:			upper = *(u16 *)loc;			lower = *(u16 *)(loc + 2); 			/*			 * 25 bit signed address range (Thumb-2 BL and B.W			 * instructions):			 *   S:I1:I2:imm10:imm11:0			 * where:			 *   S     = upper[10]   = offset[24]			 *   I1    = ~(J1 ^ S)   = offset[23]			 *   I2    = ~(J2 ^ S)   = offset[22]			 *   imm10 = upper[9:0]  = offset[21:12]			 *   imm11 = lower[10:0] = offset[11:1]			 *   J1    = lower[13]			 *   J2    = lower[11]			 */			sign = (upper >> 10) & 1;			j1 = (lower >> 13) & 1;			j2 = (lower >> 11) & 1;			offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |				((~(j2 ^ sign) & 1) << 22) |				((upper & 0x03ff) << 12) |				((lower & 0x07ff) << 1);			if (offset & 0x01000000)				offset -= 0x02000000;			offset += sym->st_value - loc; 			/* only Thumb addresses allowed (no interworking) */			if (!(offset & 1) ||			    offset <= (s32)0xff000000 ||			    offset >= (s32)0x01000000) {				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;			} 			sign = (offset >> 24) & 1;			j1 = sign ^ (~(offset >> 23) & 1);			j2 = sign ^ (~(offset >> 22) & 1);			*(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) |					    ((offset >> 12) & 0x03ff));			*(u16 *)(loc + 2) = (u16)((lower & 0xd000) |						  (j1 << 13) | (j2 << 11) |						  ((offset >> 1) & 0x07ff));			break; 		case R_ARM_THM_MOVW_ABS_NC:		case R_ARM_THM_MOVT_ABS:			upper = *(u16 *)loc;			lower = *(u16 *)(loc + 2); 			/*			 * MOVT/MOVW instructions encoding in Thumb-2:			 *			 * i	= upper[10]			 * imm4	= upper[3:0]			 * imm3	= lower[14:12]			 * imm8	= lower[7:0]			 *			 * imm16 = imm4:i:imm3:imm8			 */			offset = ((upper & 0x000f) << 12) |				((upper & 0x0400) << 1) |				((lower & 0x7000) >> 4) | (lower & 0x00ff);			offset = (offset ^ 0x8000) - 0x8000;			offset += sym->st_value; 			if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)				offset >>= 16; 			*(u16 *)loc = (u16)((upper & 0xfbf0) |					    ((offset & 0xf000) >> 12) |					    ((offset & 0x0800) >> 1));			*(u16 *)(loc + 2) = (u16)((lower & 0x8f00) |						  ((offset & 0x0700) << 4) |						  (offset & 0x00ff));			break;#endif 		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;} #ifdef CONFIG_ARM_UNWINDstatic void register_unwind_tables(struct module *mod){	int i;	for (i = 0; i < ARM_SEC_MAX; ++i) {		struct arm_unwind_mapping *map = &mod->arch.map[i];		if (map->unw_sec && map->sec_text)			map->unwind = unwind_table_add(map->unw_sec->sh_addr,						       map->unw_sec->sh_size,						       map->sec_text->sh_addr,						       map->sec_text->sh_size);	}} static void unregister_unwind_tables(struct module *mod){	int i = ARM_SEC_MAX;	while (--i >= 0)		unwind_table_del(mod->arch.map[i].unwind);}#elsestatic inline void register_unwind_tables(struct module *mod) { }static inline void unregister_unwind_tables(struct module *mod) { }#endif intmodule_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,		struct module *module){	register_unwind_tables(module);	return 0;} voidmodule_arch_cleanup(struct module *mod){	unregister_unwind_tables(mod);}