// SPDX-License-Identifier: GPL-2.0#include <linux/moduleloader.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/kernel.h> int apply_relocate_add(Elf32_Shdr *sechdrs,		       const char *strtab,		       unsigned int symindex,		       unsigned int relsec,		       struct module *me){	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 *loc =			(uint32_t *)(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; 		switch (ELF32_R_TYPE(rela[i].r_info)) {		case R_H8_DIR24R8:			loc = (uint32_t *)((uint32_t)loc - 1);			*loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);			break;		case R_H8_DIR24A8:			if (ELF32_R_SYM(rela[i].r_info))				*loc += v;			break;		case R_H8_DIR32:		case R_H8_DIR32A16:			*loc += v;			break;		case R_H8_PCREL16:			v -= (unsigned long)loc + 2;			if ((Elf32_Sword)v > 0x7fff ||			    (Elf32_Sword)v < -(Elf32_Sword)0x8000)				goto overflow;			else				*(unsigned short *)loc = v;			break;		case R_H8_PCREL8:			v -= (unsigned long)loc + 1;			if ((Elf32_Sword)v > 0x7f ||			    (Elf32_Sword)v < -(Elf32_Sword)0x80)				goto overflow;			else				*(unsigned char *)loc = v;			break;		default:			pr_err("module %s: Unknown relocation: %u\n",			       me->name, ELF32_R_TYPE(rela[i].r_info));			return -ENOEXEC;		}	}	return 0; overflow:	pr_err("module %s: relocation offset overflow: %08x\n",	       me->name, rela[i].r_offset);	return -ENOEXEC;}