1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> 4 * Copyright (C) 2007-2009 PetaLogix 5 */ 6 7 #include <linux/export.h> 8 #include <linux/moduleloader.h> 9 #include <linux/kernel.h> 10 #include <linux/elf.h> 11 #include <linux/vmalloc.h> 12 #include <linux/fs.h> 13 #include <linux/string.h> 14 #include <linux/pgtable.h> 15 16 #include <asm/cacheflush.h> 17 18 int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, 19 unsigned int symindex, unsigned int relsec, struct module *module) 20 { 21 22 unsigned int i; 23 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; 24 Elf32_Sym *sym; 25 unsigned long int *location; 26 unsigned long int value; 27 28 pr_debug("Applying add relocation section %u to %u\n", 29 relsec, sechdrs[relsec].sh_info); 30 31 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { 32 33 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + 34 rela[i].r_offset; 35 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + 36 ELF32_R_SYM(rela[i].r_info); 37 value = sym->st_value + rela[i].r_addend; 38 39 switch (ELF32_R_TYPE(rela[i].r_info)) { 40 41 /* 42 * Be careful! mb-gcc / mb-ld splits the relocs between the 43 * text and the reloc table. In general this means we must 44 * read the current contents of (*location), add any offset 45 * then store the result back in 46 */ 47 48 case R_MICROBLAZE_32: 49 *location = value; 50 break; 51 52 case R_MICROBLAZE_64: 53 location[0] = (location[0] & 0xFFFF0000) | 54 (value >> 16); 55 location[1] = (location[1] & 0xFFFF0000) | 56 (value & 0xFFFF); 57 break; 58 59 case R_MICROBLAZE_64_PCREL: 60 value -= (unsigned long int)(location) + 4; 61 location[0] = (location[0] & 0xFFFF0000) | 62 (value >> 16); 63 location[1] = (location[1] & 0xFFFF0000) | 64 (value & 0xFFFF); 65 pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", 66 value); 67 break; 68 69 case R_MICROBLAZE_32_PCREL_LO: 70 pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); 71 break; 72 73 case R_MICROBLAZE_64_NONE: 74 pr_debug("R_MICROBLAZE_64_NONE\n"); 75 break; 76 77 case R_MICROBLAZE_NONE: 78 pr_debug("R_MICROBLAZE_NONE\n"); 79 break; 80 81 default: 82 pr_err("module %s: Unknown relocation: %u\n", 83 module->name, 84 ELF32_R_TYPE(rela[i].r_info)); 85 return -ENOEXEC; 86 } 87 } 88 return 0; 89 } 90 91 int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, 92 struct module *module) 93 { 94 flush_dcache(); 95 return 0; 96 } 97