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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081// SPDX-License-Identifier: GPL-2.0-or-later/* * OpenRISC module.c * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * Modifications for the OpenRISC architecture: * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> */
#include <linux/moduleloader.h>#include <linux/elf.h>
int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me){ unsigned int i; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; uint32_t *location; uint32_t value;
pr_debug("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset;
/* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rel[i].r_info); value = sym->st_value + rel[i].r_addend;
switch (ELF32_R_TYPE(rel[i].r_info)) { case R_OR1K_32: *location = value; break; case R_OR1K_LO_16_IN_INSN: *((uint16_t *)location + 1) = value; break; case R_OR1K_HI_16_IN_INSN: *((uint16_t *)location + 1) = value >> 16; break; case R_OR1K_INSN_REL_26: value -= (uint32_t)location; value >>= 2; value &= 0x03ffffff; value |= *location & 0xfc000000; *location = value; break; case R_OR1K_32_PCREL: value -= (uint32_t)location; *location = value; break; case R_OR1K_AHI16: /* Adjust the operand to match with a signed LO16. */ value += 0x8000; *((uint16_t *)location + 1) = value >> 16; break; case R_OR1K_SLO16: /* Split value lower 16-bits. */ value = ((value & 0xf800) << 10) | (value & 0x7ff); *location = (*location & ~0x3e007ff) | value; break; default: pr_err("module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); break; } }
return 0;}