/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <string.h>
#include "machdep.h"
#include "reloc.h"
#include "_librtld.h"
#include "_elf.h"
/*
* Undo relocations that have been applied to a memory image. Basically this
* involves copying the original files relocation offset into the new image
* being created.
*/
void
undo_reloc(void *vrel, uchar_t *oaddr, uchar_t *iaddr, Reloc *reloc)
{
Rel *rel = vrel;
/* LINTED */
ulong_t *_oaddr = (ulong_t *)oaddr;
/* LINTED */
ulong_t *_iaddr = (ulong_t *)iaddr;
switch (ELF_R_TYPE(rel->r_info, M_MACH)) {
case R_386_NONE:
break;
case R_386_COPY:
(void) memset((void *)oaddr, 0, (size_t)reloc->r_size);
break;
case R_386_JMP_SLOT:
if (_iaddr)
*_oaddr = *_iaddr + reloc->r_value;
else
*_oaddr = reloc->r_value;
break;
default:
if (_iaddr)
*_oaddr = *_iaddr;
else
*_oaddr = 0;
break;
}
}
/*
* Copy a relocation record and increment its value. The record must reflect
* the new address to which this image is fixed. Note that .got entries
* associated with .plt's must be fixed to the new base address.
*/
void
inc_reloc(void *vnrel, void *vorel, Reloc *reloc, uchar_t *oaddr,
uchar_t *iaddr)
{
Rel *nrel = vnrel;
Rel *orel = vorel;
/* LINTED */
ulong_t *_oaddr = (ulong_t *)oaddr;
/* LINTED */
ulong_t *_iaddr = (ulong_t *)iaddr;
if (ELF_R_TYPE(nrel->r_info, M_MACH) == R_386_JMP_SLOT) {
if (_iaddr)
*_oaddr = *_iaddr + reloc->r_value;
else
*_oaddr = reloc->r_value;
}
*nrel = *orel;
nrel->r_offset += reloc->r_value;
}
/*
* Clear a relocation record. The relocation has been applied to the image and
* thus the relocation must not occur again.
*/
void
clear_reloc(void *vrel)
{
Rel *rel = vrel;
rel->r_offset = 0;
rel->r_info = ELF_R_INFO(0, R_386_NONE);
}
/*
* Apply a relocation to an image being built from an input file. Use the
* runtime linkers routines to do the necessary magic.
*/
void
apply_reloc(void *vrel, Reloc *reloc, const char *name, uchar_t *oaddr,
Rt_map *lmp)
{
Rel *rel = vrel;
Xword type = ELF_R_TYPE(rel->r_info, M_MACH);
Word value = reloc->r_value;
if (type == R_386_JMP_SLOT) {
uintptr_t addr, vaddr;
if (FLAGS(lmp) & FLG_RT_FIXED)
vaddr = 0;
else
vaddr = ADDR(lmp);
addr = (uintptr_t)oaddr - rel->r_offset;
/* LINTED */
(void) elf_plt_write((uintptr_t)addr, vaddr, rel,
(uintptr_t)value, reloc->r_pltndx);
} else if (type == R_386_COPY) {
(void) memcpy((void *)oaddr, (void *)value,
(size_t)reloc->r_size);
} else {
(void) do_reloc_rtld(type, oaddr, &value, reloc->r_name, name,
LIST(lmp));
}
}