77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
// 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 <jonas@southpole.se>
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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_OR1K_32:
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*location = value;
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break;
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case R_OR1K_LO_16_IN_INSN:
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*((uint16_t *)location + 1) = value;
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break;
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case R_OR1K_HI_16_IN_INSN:
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*((uint16_t *)location + 1) = value >> 16;
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break;
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case R_OR1K_INSN_REL_26:
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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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case R_OR1K_AHI16:
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/* Adjust the operand to match with a signed LO16. */
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value += 0x8000;
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*((uint16_t *)location + 1) = value >> 16;
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break;
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case R_OR1K_SLO16:
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/* Split value lower 16-bits. */
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value = ((value & 0xf800) << 10) | (value & 0x7ff);
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*location = (*location & ~0x3e007ff) | 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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