// SPDX-License-Identifier: GPL-2.0-or-later /* * OpenRISC module.c * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * Modifications for the OpenRISC architecture: * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> */ #include <linux/moduleloader.h> #include <linux/elf.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 *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; uint32_t *location; uint32_t value; pr_debug("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); value = sym->st_value + rel[i].r_addend; switch (ELF32_R_TYPE(rel[i].r_info)) { case R_OR32_32: *location = value; break; case R_OR32_CONST: *((uint16_t *)location + 1) = value; break; case R_OR32_CONSTH: *((uint16_t *)location + 1) = value >> 16; break; case R_OR32_JUMPTARG: value -= (uint32_t)location; value >>= 2; value &= 0x03ffffff; value |= *location & 0xfc000000; *location = value; break; default: pr_err("module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); break; } } return 0; }