e82e4a2984
Add support for booting relocatable kernels on PowerPC. Add code to support loading relocatable kernels at offsets that are not zero. Move ubldr text section to the start of the output file, so that when you create a stripped .bin file from it the entry point is the first byte of the file. (Will allow "load $addr $file ; go $addr" in u-boot.) Create a relocatable instance of ubldr for ARM (ubldr.bin). Re-link ubldr when any of its libraries change. An ARM kernel can be loaded at any 2MB boundary, make ubldr aware of that.
124 lines
3.5 KiB
C
124 lines
3.5 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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/*
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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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/* Address relative to the base address. */
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newaddr = (Elf_Addr *)(rel->r_offset + baseaddr);
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*newaddr += baseaddr;
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/* Add the addend when the ABI uses them */
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#ifdef ELF_RELA
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*newaddr += rel->r_addend;
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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 *) ((caddr_t) rel + relent);
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}
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}
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