// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2007-2009 PetaLogix */ #include <linux/export.h>#include <linux/moduleloader.h>#include <linux/kernel.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h> #include <asm/pgtable.h>#include <asm/cacheflush.h> int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,	unsigned int symindex, unsigned int relsec, struct module *module){ 	unsigned int i;	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;	Elf32_Sym *sym;	unsigned long int *location;	unsigned long int value;#if __GNUC__ < 4	unsigned long int old_value;#endif 	pr_debug("Applying add relocation section %u to %u\n",		relsec, sechdrs[relsec].sh_info); 	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { 		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +				rela[i].r_offset;		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +			ELF32_R_SYM(rela[i].r_info);		value = sym->st_value + rela[i].r_addend; 		switch (ELF32_R_TYPE(rela[i].r_info)) { 		/*		 * Be careful! mb-gcc / mb-ld splits the relocs between the		 * text and the reloc table. In general this means we must		 * read the current contents of (*location), add any offset		 * then store the result back in		 */ 		case R_MICROBLAZE_32:#if __GNUC__ < 4			old_value = *location;			*location = value + old_value; 			pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",				old_value, value);#else			*location = value;#endif			break; 		case R_MICROBLAZE_64:#if __GNUC__ < 4			/* Split relocs only required/used pre gcc4.1.1 */			old_value = ((location[0] & 0x0000FFFF) << 16) |					(location[1] & 0x0000FFFF);			value += old_value;#endif			location[0] = (location[0] & 0xFFFF0000) |					(value >> 16);			location[1] = (location[1] & 0xFFFF0000) |					(value & 0xFFFF);#if __GNUC__ < 4			pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",				old_value, value);#endif			break; 		case R_MICROBLAZE_64_PCREL:#if __GNUC__ < 4			old_value = (location[0] & 0xFFFF) << 16 |				(location[1] & 0xFFFF);			value -= old_value;#endif			value -= (unsigned long int)(location) + 4;			location[0] = (location[0] & 0xFFFF0000) |					(value >> 16);			location[1] = (location[1] & 0xFFFF0000) |					(value & 0xFFFF);			pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",				value);			break; 		case R_MICROBLAZE_32_PCREL_LO:			pr_debug("R_MICROBLAZE_32_PCREL_LO\n");			break; 		case R_MICROBLAZE_64_NONE:			pr_debug("R_MICROBLAZE_64_NONE\n");			break; 		case R_MICROBLAZE_NONE:			pr_debug("R_MICROBLAZE_NONE\n");			break; 		default:			pr_err("module %s: Unknown relocation: %u\n",				module->name,				ELF32_R_TYPE(rela[i].r_info));			return -ENOEXEC;		}	}	return 0;} int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,		struct module *module){	flush_dcache();	return 0;}