| 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 | } |