Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> |
| 3 | * Copyright (C) 2007-2009 PetaLogix |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/moduleloader.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/elf.h> |
| 14 | #include <linux/vmalloc.h> |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 15 | #include <linux/fs.h> |
| 16 | #include <linux/string.h> |
| 17 | |
| 18 | #include <asm/pgtable.h> |
Michal Simek | a5e48b8 | 2010-05-14 07:40:46 +0200 | [diff] [blame] | 19 | #include <asm/cacheflush.h> |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 20 | |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 21 | int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
| 22 | unsigned int symindex, unsigned int relsec, struct module *module) |
| 23 | { |
| 24 | |
| 25 | unsigned int i; |
| 26 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; |
| 27 | Elf32_Sym *sym; |
| 28 | unsigned long int *location; |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 29 | unsigned long int value; |
| 30 | #if __GNUC__ < 4 |
| 31 | unsigned long int old_value; |
| 32 | #endif |
| 33 | |
| 34 | pr_debug("Applying add relocation section %u to %u\n", |
| 35 | relsec, sechdrs[relsec].sh_info); |
| 36 | |
| 37 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { |
| 38 | |
| 39 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + |
| 40 | rela[i].r_offset; |
| 41 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + |
| 42 | ELF32_R_SYM(rela[i].r_info); |
| 43 | value = sym->st_value + rela[i].r_addend; |
| 44 | |
| 45 | switch (ELF32_R_TYPE(rela[i].r_info)) { |
| 46 | |
| 47 | /* |
| 48 | * Be careful! mb-gcc / mb-ld splits the relocs between the |
| 49 | * text and the reloc table. In general this means we must |
| 50 | * read the current contents of (*location), add any offset |
| 51 | * then store the result back in |
| 52 | */ |
| 53 | |
| 54 | case R_MICROBLAZE_32: |
| 55 | #if __GNUC__ < 4 |
| 56 | old_value = *location; |
| 57 | *location = value + old_value; |
| 58 | |
| 59 | pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n", |
| 60 | old_value, value); |
| 61 | #else |
| 62 | *location = value; |
| 63 | #endif |
| 64 | break; |
| 65 | |
| 66 | case R_MICROBLAZE_64: |
| 67 | #if __GNUC__ < 4 |
| 68 | /* Split relocs only required/used pre gcc4.1.1 */ |
| 69 | old_value = ((location[0] & 0x0000FFFF) << 16) | |
| 70 | (location[1] & 0x0000FFFF); |
| 71 | value += old_value; |
| 72 | #endif |
| 73 | location[0] = (location[0] & 0xFFFF0000) | |
| 74 | (value >> 16); |
| 75 | location[1] = (location[1] & 0xFFFF0000) | |
| 76 | (value & 0xFFFF); |
| 77 | #if __GNUC__ < 4 |
| 78 | pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n", |
| 79 | old_value, value); |
| 80 | #endif |
| 81 | break; |
| 82 | |
| 83 | case R_MICROBLAZE_64_PCREL: |
John Williams | fadf2e6 | 2009-07-23 14:56:49 +1000 | [diff] [blame] | 84 | #if __GNUC__ < 4 |
| 85 | old_value = (location[0] & 0xFFFF) << 16 | |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 86 | (location[1] & 0xFFFF); |
John Williams | fadf2e6 | 2009-07-23 14:56:49 +1000 | [diff] [blame] | 87 | value -= old_value; |
| 88 | #endif |
| 89 | value -= (unsigned long int)(location) + 4; |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 90 | location[0] = (location[0] & 0xFFFF0000) | |
| 91 | (value >> 16); |
| 92 | location[1] = (location[1] & 0xFFFF0000) | |
| 93 | (value & 0xFFFF); |
| 94 | pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", |
| 95 | value); |
| 96 | break; |
| 97 | |
John Williams | fadf2e6 | 2009-07-23 14:56:49 +1000 | [diff] [blame] | 98 | case R_MICROBLAZE_32_PCREL_LO: |
| 99 | pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); |
| 100 | break; |
| 101 | |
Michal Simek | 679711b | 2009-07-23 08:24:47 +0200 | [diff] [blame] | 102 | case R_MICROBLAZE_64_NONE: |
Michal Simek | f5b778b | 2011-11-29 12:57:09 +0100 | [diff] [blame^] | 103 | pr_debug("R_MICROBLAZE_64_NONE\n"); |
Michal Simek | 679711b | 2009-07-23 08:24:47 +0200 | [diff] [blame] | 104 | break; |
| 105 | |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 106 | case R_MICROBLAZE_NONE: |
| 107 | pr_debug("R_MICROBLAZE_NONE\n"); |
| 108 | break; |
| 109 | |
| 110 | default: |
| 111 | printk(KERN_ERR "module %s: " |
| 112 | "Unknown relocation: %u\n", |
| 113 | module->name, |
John Williams | fadf2e6 | 2009-07-23 14:56:49 +1000 | [diff] [blame] | 114 | ELF32_R_TYPE(rela[i].r_info)); |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 115 | return -ENOEXEC; |
| 116 | } |
| 117 | } |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
| 122 | struct module *module) |
| 123 | { |
Michal Simek | a5e48b8 | 2010-05-14 07:40:46 +0200 | [diff] [blame] | 124 | flush_dcache(); |
Michal Simek | f6b165c | 2009-03-27 14:25:17 +0100 | [diff] [blame] | 125 | return 0; |
| 126 | } |