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/*
* Taken from NetBSD and stripped of the relocations not needed on RTEMS.
*/
/* $NetBSD: ppc_reloc.c,v 1.44 2010/01/13 20:17:22 christos Exp $ */
/*-
* Copyright (C) 1998 Tsubai Masanari
* Portions copyright 2002 Charles M. Hannum <root@ihack.net>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
#include <sys/cdefs.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <rtl.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include <rtl-trace.h>
#define ha(x) ((((u_int32_t)(x) & 0x8000) ? \
((u_int32_t)(x) + 0x10000) : (u_int32_t)(x)) >> 16)
#define l(x) ((u_int32_t)(x) & 0xffff)
/*
* The PPC PLT format consists of three sections:
* (1) The "pltcall" and "pltresolve" glue code. This is always 18 words.
* (2) The code part of the PLT entries. There are 2 words per entry for
* up to 8192 entries, then 4 words per entry for any additional entries.
* (3) The data part of the PLT entries, comprising a jump table.
* This section is half the size of the second section (ie. 1 or 2 words
* per entry).
*/
/*
* Setup the plt glue routines.
*/
#define PLTCALL_SIZE 20
#define PLTRESOLVE_SIZE 24
bool
rtems_rtl_elf_relocate_rela (rtems_rtl_obj_t* obj,
const Elf_Rela* rela,
rtems_rtl_obj_sect_t* sect,
const Elf_Sym* sym,
const char* symname)
{
Elf_Addr target = 0;
Elf_Addr* where;
Elf_Word symvalue;
where = (Elf_Addr *)(sect->base + rela->r_offset);
switch (ELF_R_TYPE(rela->r_info)) {
case R_TYPE(JMP_SLOT):
case R_TYPE(NONE):
break;
case R_TYPE(PC32):
if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
return false;
target = (Elf_Addr) symvalue + rela->r_addend;
*where += target - (Elf_Addr)where;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc PC32 %s in %s --> %p (%p) in %s\n",
symname, sect->name, (void*) (symvalue + rela->r_addend),
(void *)*where, obj->oname);
break;
case R_TYPE(32): /* word32 S + A */
case R_TYPE(GLOB_DAT): /* word32 S + A */
if (!rtems_rtl_elf_find_symbol (obj, sym, symname, &symvalue))
return false;
target = (Elf_Addr) symvalue + rela->r_addend;
if (*where != target)
*where = target;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc 32/GLOB_DAT %s in %s --> %p in %s\n",
symname, sect->name, (void *)*where, obj->oname);
break;
case R_TYPE(RELATIVE): /* word32 B + A */
*where += (Elf_Addr) sect->base + rela->r_addend;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc RELATIVE in %s --> %p\n", obj->oname, (void *)*where);
break;
case R_TYPE(COPY):
/*
* These are deferred until all other relocations have
* been done. All we do here is make sure that the
* COPY relocation is not in a shared library. They
* are allowed only in executable files.
*/
printf ("rtl: reloc COPY (please report)\n");
break;
default:
printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
"contents = %p, symbol = %s\n",
ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info),
(void *)rela->r_offset, (void *)*where, symname);
rtems_rtl_set_error (EINVAL,
"%s: Unsupported relocation type %ld "
"in non-PLT relocations",
sect->name, (uint32_t) ELF_R_TYPE(rela->r_info));
return false;
}
return false;
}
bool
rtems_rtl_elf_relocate_rel (rtems_rtl_obj_t* obj,
const Elf_Rel* rel,
rtems_rtl_obj_sect_t* sect,
const Elf_Sym* sym,
const char* symname)
{
printf ("rtl: rel type record not supported; please report\n");
return false;
}
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