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/*-
* Copyright 1996-1998 John D. Polstra.
* 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 ``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 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/linker.h>
#include <machine/elf.h>
/* Process one elf relocation with addend. */
int
elf_reloc(linker_file_t lf, const void *data, int type)
{
Elf_Addr relocbase = (Elf_Addr) lf->address;
Elf_Addr *where;
Elf_Addr addr;
Elf_Addr addend;
Elf_Word rtype, symidx;
const Elf_Rel *rel;
const Elf_Rela *rela;
switch (type) {
case ELF_RELOC_REL:
rel = (const Elf_Rel *)data;
where = (Elf_Addr *) (relocbase + rel->r_offset);
addend = *where;
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
break;
case ELF_RELOC_RELA:
rela = (const Elf_Rela *)data;
where = (Elf_Addr *) (relocbase + rela->r_offset);
addend = rela->r_addend;
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
break;
default:
panic("unknown reloc type %d\n", type);
}
switch (rtype) {
case R_386_NONE: /* none */
break;
case R_386_32: /* S + A */
addr = elf_lookup(lf, symidx, 1);
if (addr == 0)
return -1;
addr += addend;
if (*where != addr)
*where = addr;
break;
case R_386_PC32: /* S + A - P */
addr = elf_lookup(lf, symidx, 1);
if (addr == 0)
return -1;
addr += addend - (Elf_Addr)where;
if (*where != addr)
*where = addr;
break;
case R_386_COPY: /* none */
/*
* There shouldn't be copy relocations in kernel
* objects.
*/
printf("kldload: unexpected R_COPY relocation\n");
return -1;
break;
case R_386_GLOB_DAT: /* S */
addr = elf_lookup(lf, symidx, 1);
if (addr == 0)
return -1;
if (*where != addr)
*where = addr;
break;
case R_386_RELATIVE: /* B + A */
addr = relocbase + addend;
if (*where != addr)
*where = addr;
break;
default:
printf("kldload: unexpected relocation type %d\n",
rtype);
return -1;
}
return(0);
}
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