// 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; }