/*
* Taken from NetBSD and stripped of the relocations not needed on RTEMS.
*/
/* $NetBSD: mdreloc.c,v 1.26 2010/01/14 11:58:32 skrll Exp $ */
#include <sys/cdefs.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <rtems/rtl/rtl.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include "rtl-trace.h"
static inline int overflow_8_check(int value)
{
if ((value & 0xffffff00) && (~value & 0xffffff80))
return true;
return false;
}
static inline int overflow_16_check(int value)
{
if ((value & 0xffff0000) && (~value & 0xffff8000))
return true;
return false;
}
bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
return true;
}
bool
rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t* obj,
const Elf_Rela* rela,
const rtems_rtl_obj_sect_t* sect,
const char* symnane,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
Elf_Addr target = 0;
Elf_Addr* where;
Elf_Word tmp;
where = (Elf_Addr *)(sect->base + rela->r_offset);
switch (ELF_R_TYPE(rela->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(PC8):
tmp = symvalue + rela->r_addend - (Elf_Addr)where;
if (overflow_8_check(tmp))
return false;
*(uint8_t *)where = tmp;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc R_TYPE_8/PC8 in %s --> %p (%p) in %s\n",
sect->name, (void*) (symvalue + rela->r_addend),
(void *)*where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(PC16):
tmp = symvalue + rela->r_addend - (Elf_Addr)where;
if (overflow_16_check(tmp))
return false;
*(uint16_t*)where = tmp;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc R_TYPE_16/PC16 in %s --> %p (%p) in %s\n",
sect->name, (void*) (symvalue + rela->r_addend),
(void *)*where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(PC32):
target = (Elf_Addr) symvalue + rela->r_addend;
*where += target - (Elf_Addr)where;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc PC32 in %s --> %p (%p) in %s\n",
sect->name, (void*) (symvalue + rela->r_addend),
(void *)*where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(GOT32):
case R_TYPE(32):
case R_TYPE(GLOB_DAT):
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 in %s --> %p in %s\n",
sect->name, (void *)*where,
rtems_rtl_obj_oname (obj));
break;
case R_TYPE(RELATIVE):
*where += (Elf_Addr) sect->base + rela->r_addend;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: reloc RELATIVE in %s --> %p\n",
rtems_rtl_obj_oname (obj), (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\n",
ELF_R_SYM(rela->r_info), (uint32_t) ELF_R_TYPE(rela->r_info),
(void *)rela->r_offset, (void *)*where);
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 true;
}
bool
rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t* obj,
const Elf_Rel* rel,
const rtems_rtl_obj_sect_t* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
rtems_rtl_set_error (EINVAL, "rel type record not supported");
return false;
}
