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