1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2003 Jake Burkholder.
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* Copyright 1996-1998 John D. Polstra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <machine/elf.h>
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#include <err.h>
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#include <errno.h>
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#include "ef.h"
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/*
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* Apply relocations to the values we got from the file. `relbase' is the
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* target relocation address of the section, and `dataoff' is the target
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* relocation address of the data in `dest'.
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*/
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int
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ef_reloc(struct elf_file *ef, const void *reldata, int reltype, Elf_Off relbase,
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Elf_Off dataoff, size_t len, void *dest)
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{
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Elf64_Addr *where, val;
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Elf32_Addr *where32, val32;
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Elf_Addr addend, addr;
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Elf_Size rtype, symidx;
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const Elf_Rel *rel;
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const Elf_Rela *rela;
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switch (reltype) {
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case EF_RELOC_REL:
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rel = (const Elf_Rel *)reldata;
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where = (Elf_Addr *)(dest + relbase + rel->r_offset - dataoff);
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addend = 0;
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rtype = ELF_R_TYPE(rel->r_info);
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symidx = ELF_R_SYM(rel->r_info);
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break;
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case EF_RELOC_RELA:
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rela = (const Elf_Rela *)reldata;
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where = (Elf_Addr *)(dest + relbase + rela->r_offset - dataoff);
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addend = rela->r_addend;
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rtype = ELF_R_TYPE(rela->r_info);
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symidx = ELF_R_SYM(rela->r_info);
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break;
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default:
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return (EINVAL);
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}
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if ((char *)where < (char *)dest || (char *)where >= (char *)dest + len)
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return (0);
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if (reltype == EF_RELOC_REL) {
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/* Addend is 32 bit on 32 bit relocs */
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switch (rtype) {
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case R_X86_64_PC32:
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case R_X86_64_32S:
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addend = *(Elf32_Addr *)where;
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break;
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default:
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addend = *where;
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break;
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}
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}
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switch (rtype) {
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case R_X86_64_NONE: /* none */
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break;
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case R_X86_64_64: /* S + A */
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addr = EF_SYMADDR(ef, symidx);
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val = addr + addend;
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*where = val;
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break;
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case R_X86_64_32S: /* S + A sign extend */
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addr = EF_SYMADDR(ef, symidx);
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val32 = (Elf32_Addr)(addr + addend);
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where32 = (Elf32_Addr *)where;
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*where32 = val32;
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break;
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case R_X86_64_GLOB_DAT: /* S */
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addr = EF_SYMADDR(ef, symidx);
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*where = addr;
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break;
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case R_X86_64_RELATIVE: /* B + A */
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addr = (Elf_Addr)addend + relbase;
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val = addr;
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*where = val;
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break;
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default:
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warnx("unhandled relocation type %d", (int)rtype);
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}
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return (0);
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}
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