f2af6f7bf1
R_AARCH64_RELATIVE relocation found on arm64. It would try to add the contents of the memory location being relocated to the base address and the relocation addend. This worked when the contents was zero, however this now seems to be set to the value of the addend so we add this twice. Fix this by just setting the memory to the computed value. Reviewed by: emaste MFC after: 1 week Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D8177
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/*-
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* Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org>
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <elf.h>
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#include <bootstrap.h>
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#if defined(__aarch64__)
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#define ElfW_Rel Elf64_Rela
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#define ElfW_Dyn Elf64_Dyn
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#define ELFW_R_TYPE ELF64_R_TYPE
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#define ELF_RELA
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#elif defined(__arm__) || defined(__i386__)
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#define ElfW_Rel Elf32_Rel
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#define ElfW_Dyn Elf32_Dyn
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#define ELFW_R_TYPE ELF32_R_TYPE
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#elif defined(__amd64__)
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#define ElfW_Rel Elf64_Rel
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#define ElfW_Dyn Elf64_Dyn
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#define ELFW_R_TYPE ELF64_R_TYPE
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#else
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#error architecture not supported
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#endif
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#if defined(__aarch64__)
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#define RELOC_TYPE_NONE R_AARCH64_NONE
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#define RELOC_TYPE_RELATIVE R_AARCH64_RELATIVE
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#elif defined(__amd64__)
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#define RELOC_TYPE_NONE R_X86_64_NONE
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#define RELOC_TYPE_RELATIVE R_X86_64_RELATIVE
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#elif defined(__arm__)
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#define RELOC_TYPE_NONE R_ARM_NONE
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#define RELOC_TYPE_RELATIVE R_ARM_RELATIVE
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#elif defined(__i386__)
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#define RELOC_TYPE_NONE R_386_NONE
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#define RELOC_TYPE_RELATIVE R_386_RELATIVE
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#endif
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void self_reloc(Elf_Addr baseaddr, ElfW_Dyn *dynamic);
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/*
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* A simple elf relocator.
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*/
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void
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self_reloc(Elf_Addr baseaddr, ElfW_Dyn *dynamic)
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{
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Elf_Word relsz, relent;
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Elf_Addr *newaddr;
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ElfW_Rel *rel;
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ElfW_Dyn *dynp;
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/*
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* Find the relocation address, its size and the relocation entry.
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*/
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relsz = 0;
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relent = 0;
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for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
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switch (dynp->d_tag) {
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case DT_REL:
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case DT_RELA:
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rel = (ElfW_Rel *)(dynp->d_un.d_ptr + baseaddr);
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break;
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case DT_RELSZ:
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case DT_RELASZ:
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relsz = dynp->d_un.d_val;
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break;
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case DT_RELENT:
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case DT_RELAENT:
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relent = dynp->d_un.d_val;
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break;
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default:
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break;
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}
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}
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/*
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* Perform the actual relocation.
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*/
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for (; relsz > 0; relsz -= relent) {
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switch (ELFW_R_TYPE(rel->r_info)) {
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case RELOC_TYPE_NONE:
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/* No relocation needs be performed. */
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break;
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case RELOC_TYPE_RELATIVE:
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newaddr = (Elf_Addr *)(rel->r_offset + baseaddr);
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#ifdef ELF_RELA
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/*
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* For R_AARCH64_RELATIVE we need to calculate the
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* delta between the address we are run from and the
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* address we are linked at. As the latter is 0 we
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* just use the address we are run from for this.
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*/
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*newaddr = baseaddr + rel->r_addend;
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#else
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/* Address relative to the base address. */
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*newaddr += baseaddr;
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#endif
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break;
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default:
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/* XXX: do we need other relocations ? */
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break;
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}
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rel = (ElfW_Rel *)(void *)((caddr_t) rel + relent);
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}
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}
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