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104 lines
3.1 KiB
C
104 lines
3.1 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 <sys/elf32.h>
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#include <efi.h>
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/*
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* XXX: we can't include sys/systm.h.
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*/
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#ifndef CTASSERT /* Allow lint to override */
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#define CTASSERT(x) _CTASSERT(x, __LINE__)
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#define _CTASSERT(x, y) __CTASSERT(x, y)
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#define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
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#endif
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/*
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* A simple relocator for IA32 EFI binaries.
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*/
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EFI_STATUS
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_reloc(unsigned long ImageBase, Elf32_Dyn *dynamic, EFI_HANDLE image_handle,
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EFI_SYSTEM_TABLE *system_table)
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{
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unsigned long relsz, relent;
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unsigned long *newaddr;
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Elf32_Rel *rel;
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Elf32_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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rel = (Elf32_Rel *) ((unsigned long) dynp->d_un.d_ptr +
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ImageBase);
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break;
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case DT_RELSZ:
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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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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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* XXX: We are reusing code for the amd64 version of this, but
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* we must make sure the relocation types are the same.
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*/
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CTASSERT(R_386_NONE == R_X86_64_NONE);
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CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE);
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for (; relsz > 0; relsz -= relent) {
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_386_NONE:
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/* No relocation needs be performed. */
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break;
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case R_386_RELATIVE:
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/* Address relative to the base address. */
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newaddr = (unsigned long *)(ImageBase + rel->r_offset);
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*newaddr += ImageBase;
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break;
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default:
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/* XXX: do we need other relocations ? */
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return (EFI_LOAD_ERROR);
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}
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rel = (Elf32_Rel *) ((caddr_t) rel + relent);
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}
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return (EFI_SUCCESS);
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}
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