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66 lines
1.7 KiB
66 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* OpenRISC module.c |
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* |
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* Linux architectural port borrowing liberally from similar works of |
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* others. All original copyrights apply as per the original source |
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* declaration. |
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* |
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* Modifications for the OpenRISC architecture: |
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* Copyright (C) 2010-2011 Jonas Bonn <[email protected]> |
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*/ |
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#include <linux/moduleloader.h> |
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#include <linux/elf.h> |
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int apply_relocate_add(Elf32_Shdr *sechdrs, |
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const char *strtab, |
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unsigned int symindex, |
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unsigned int relsec, |
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struct module *me) |
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{ |
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unsigned int i; |
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
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Elf32_Sym *sym; |
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uint32_t *location; |
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uint32_t value; |
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pr_debug("Applying relocate section %u to %u\n", relsec, |
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sechdrs[relsec].sh_info); |
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
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/* This is where to make the change */ |
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
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+ rel[i].r_offset; |
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/* This is the symbol it is referring to. Note that all |
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undefined symbols have been resolved. */ |
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
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+ ELF32_R_SYM(rel[i].r_info); |
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value = sym->st_value + rel[i].r_addend; |
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switch (ELF32_R_TYPE(rel[i].r_info)) { |
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case R_OR32_32: |
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*location = value; |
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break; |
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case R_OR32_CONST: |
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*((uint16_t *)location + 1) = value; |
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break; |
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case R_OR32_CONSTH: |
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*((uint16_t *)location + 1) = value >> 16; |
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break; |
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case R_OR32_JUMPTARG: |
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value -= (uint32_t)location; |
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value >>= 2; |
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value &= 0x03ffffff; |
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value |= *location & 0xfc000000; |
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*location = value; |
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break; |
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default: |
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pr_err("module %s: Unknown relocation: %u\n", |
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me->name, ELF32_R_TYPE(rel[i].r_info)); |
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break; |
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} |
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} |
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return 0; |
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}
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