Date: Wed, 7 Oct 1998 11:25:17 -0400 (EDT) From: Brian Feldman <green@unixhelp.org> To: current@FreeBSD.ORG Message-ID: <Pine.BSF.4.03.9810071123210.1840-200000@feldman.dyn.ml.org>
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[-- Attachment #1 --]
How does this work, as a translation of elf_machdep.c from alpha, to i386?
Note: kldload still doesn't work right.....
Brian Feldman
green@unixhelp.org
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Version: 3.12
GCM/CS/SS d- s+:+ a--- C++(++++) UB++++ P---- L- E---(+) W+++ N@ o? K- W--- O M- V-- PS+ PE-() Y+ PGP(+) t+ 5-- X++ R+ mtv b++(+++) D+ D++ G e* h(+) r+(-) z-
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[-- Attachment #2 --]
/*-
* 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.
*
* $Id: elf_machdep.c,v 1.1 1998/09/11 08:47:02 dfr Exp $
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/linker.h>
#include <machine/elf.h>
/* Process one elf relocation with addend. */
int
elf_reloc(linker_file_t lf, const Elf_Rela *rela, const char *sym)
{
Elf_Addr relocbase = (Elf_Addr) lf->address;
Elf_Addr *where = (Elf_Addr *) (relocbase + rela->r_offset);
switch (ELF_R_TYPE(rela->r_info)) {
case R_386_32: case R_386_PC32: {
Elf_Addr addr;
addr = (Elf_Addr)
linker_file_lookup_symbol(lf, sym, 1);
if (addr == NULL)
return -1;
*where += addr + rela->r_addend - (Elf_Addr)
(ELF_R_TYPE(rela->r_info) == R_386_PC32 ? where
: 0);
}
break;
case R_386_GLOB_DAT: {
Elf_Addr addr;
addr = (Elf_Addr)
linker_file_lookup_symbol(lf, sym, 1);
if (addr == NULL)
return -1;
if (*where != addr)
*where = addr;
}
break;
case R_386_JMP_SLOT: {
/* No point in lazy binding for kernel modules. */
Elf_Addr addr;
addr = (Elf_Addr)
linker_file_lookup_symbol(lf, sym, 1);
if (addr == NULL)
return -1;
if (*where != addr)
*where = addr;
}
break;
case R_386_RELATIVE: {
*where += relocbase;
}
break;
case R_386_COPY: {
/*
* There shouldn't be copy relocations in kernel
* objects.
*/
printf("kldload: unexpected R_COPY relocation\n");
return -1;
}
break;
default:
printf("kldload: unexpected relocation type %d\n",
ELF_R_TYPE(rela->r_info));
return -1;
}
return(0);
}
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