104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/*-
|
|
* Copyright (c) 2008-2010 Rui Paulo <rpaulo@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/elf32.h>
|
|
#include <efi.h>
|
|
|
|
/*
|
|
* XXX: we can't include sys/systm.h.
|
|
*/
|
|
#ifndef CTASSERT /* Allow lint to override */
|
|
#define CTASSERT(x) _CTASSERT(x, __LINE__)
|
|
#define _CTASSERT(x, y) __CTASSERT(x, y)
|
|
#define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
|
|
#endif
|
|
|
|
|
|
/*
|
|
* A simple relocator for IA32 EFI binaries.
|
|
*/
|
|
EFI_STATUS
|
|
_reloc(unsigned long ImageBase, Elf32_Dyn *dynamic, EFI_HANDLE image_handle,
|
|
EFI_SYSTEM_TABLE *system_table)
|
|
{
|
|
unsigned long relsz, relent;
|
|
unsigned long *newaddr;
|
|
Elf32_Rel *rel;
|
|
Elf32_Dyn *dynp;
|
|
|
|
/*
|
|
* Find the relocation address, its size and the relocation entry.
|
|
*/
|
|
relsz = 0;
|
|
relent = 0;
|
|
for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) {
|
|
switch (dynp->d_tag) {
|
|
case DT_REL:
|
|
rel = (Elf32_Rel *) ((unsigned long) dynp->d_un.d_ptr +
|
|
ImageBase);
|
|
break;
|
|
case DT_RELSZ:
|
|
relsz = dynp->d_un.d_val;
|
|
break;
|
|
case DT_RELENT:
|
|
relent = dynp->d_un.d_val;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform the actual relocation.
|
|
* XXX: We are reusing code for the amd64 version of this, but
|
|
* we must make sure the relocation types are the same.
|
|
*/
|
|
CTASSERT(R_386_NONE == R_X86_64_NONE);
|
|
CTASSERT(R_386_RELATIVE == R_X86_64_RELATIVE);
|
|
for (; relsz > 0; relsz -= relent) {
|
|
switch (ELF32_R_TYPE(rel->r_info)) {
|
|
case R_386_NONE:
|
|
/* No relocation needs be performed. */
|
|
break;
|
|
case R_386_RELATIVE:
|
|
/* Address relative to the base address. */
|
|
newaddr = (unsigned long *)(ImageBase + rel->r_offset);
|
|
*newaddr += ImageBase;
|
|
break;
|
|
default:
|
|
/* XXX: do we need other relocations ? */
|
|
return (EFI_LOAD_ERROR);
|
|
}
|
|
rel = (Elf32_Rel *) ((caddr_t) rel + relent);
|
|
}
|
|
|
|
return (EFI_SUCCESS);
|
|
}
|