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#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"
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* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
rtems_rtl_set_error (EINVAL, "rela type record not supported");
return false;
}
/*
* 1. _gp_disp symbol are not considered in this file.
* 2. There is a local/external column;
* local corresponds to (STB_LOCAL & STT_SECTION) and
* all others are external. Because if the type of a
* symbol is STT_SECTION, it must be STB_LOCAL. Thus
* just consider symtype here.
*/
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)
{
Elf_Addr *where;
Elf_Word tmp;
Elf_Word addend = (Elf_Word)0;
Elf_Word local = 0;
uint32_t t;
static Elf_Addr *where_hi16;
static Elf_Addr ahl;
where = (Elf_Addr *)(sect->base + rel->r_offset);
addend = *where;
if (syminfo == STT_SECTION)
local = 1;
switch (ELF_R_TYPE(rel->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(16):
tmp = addend & 0xffff;
if ((tmp & 0x8000) == 0x8000)
tmp |= 0xffff0000; /* Sign extend */
tmp = symvalue + (int)tmp;
if ((tmp & 0xffff0000) != 0) {
printf("R_MIPS_16 Overflow\n");
return false;
}
*where = (tmp & 0xffff) | (*where & 0xffff0000);
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(32):
tmp = symvalue + addend;
if (addend != tmp)
*where = tmp;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_32 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(26):
addend &= 0x03ffffff;
addend <<= 2;
if (local == 1) { /* STB_LOCAL and STT_SECTION */
tmp = symvalue + (((Elf_Addr)where & 0xf0000000) | addend);
tmp >>= 2;
} else { /* external */
tmp = addend;
if ((tmp & 0x08000000) == 0x08000000)
tmp |= 0xf0000000; /* Sign extened */
tmp = ((int)tmp + symvalue) >> 2;
}
*where &= ~0x03ffffff;
*where |= tmp & 0x03ffffff;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_26 local=%d %p @ %p in %s\n",
local, (void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(HI16):
ahl = addend << 16;
where_hi16 = where;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_HI16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(LO16):
//ahl += (int16_t)addend;
t = ahl + (int16_t)addend;
tmp = symvalue;
if (tmp == 0)
return false;
addend &= 0xffff0000;
addend |= (uint16_t)(t + tmp);
*where = addend;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf("*where %x where %x\n", *where, where);
addend = *where_hi16;
addend &= 0xffff0000;
addend |= ((t + tmp) - (int16_t)(t + tmp)) >> 16;
*where_hi16 = addend;
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf("*where_hi %x where_hi %x\n", *where_hi16, where_hi16);
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_LO16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
case R_TYPE(PC16):
tmp = addend & 0xffff;
if ((tmp & 0x8000) == 0x8000)
tmp |= 0xffff0000; /* Sign extend */
tmp = symvalue + ((int)tmp*4) - (Elf_Addr)where;
tmp = (Elf_Sword)tmp >> 2;
if (((Elf_Sword)tmp > 0x7fff) || ((Elf_Sword)tmp < -0x8000)) {
printf("R_MIPS_PC16 Overflow\n");
return false;
}
*where = (tmp & 0xffff) | (*where & 0xffff0000);
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
printf ("rtl: R_MIPS_PC16 %p @ %p in %s\n",
(void *)*(where), where, rtems_rtl_obj_oname (obj));
break;
default:
printf ("rtl: reloc unknown: sym = %lu, type = %lu, offset = %p, "
"contents = %p\n",
ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
(void *)rel->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(rel->r_info));
return false;
}
return true;
}
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