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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 <rtems/rtl/rtl-trace.h>
#include "rtl-unwind.h"
#include "rtl-unwind-dw2.h"
uint32_t
rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
const Elf_Shdr* shdr)
{
return 0;
}
bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
return true;
}
bool
rtems_rtl_elf_relocate_rela (const rtems_rtl_obj* obj,
const Elf_Rela* rela,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
Elf_Addr *where;
Elf32_Word tmp;
Elf32_Word insn;
where = (Elf_Addr *)(sect->base + rela->r_offset);
switch (ELF_R_TYPE(rela->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(HI16):
insn = *where;
/* orhi/mvhi instruction
* 31--------26|25-21|20-16|15----0|
* |0 1 1 1 1 0 |rY |rX |imm16 |
*/
if (0x1e == (insn >> 26)) {
insn &= 0xffff0000;
insn |= ((symvalue + rela->r_addend) >> 16);
*where = insn;
}
break;
case R_TYPE(LO16):
insn = *where;
/* ori instruction
* 31--------26|25-21|20-16|15----0|
* |0 0 1 1 1 0 |rY |rX |imm16 |
*/
if (0xe == (insn >> 26)) {
insn &= 0xffff0000;
insn |= ((symvalue + rela->r_addend) & 0xffff);
*where = insn;
}
break;
case R_TYPE(CALL):
insn = *where;
/*
* calli instruction
* 31-------26|25---0|
* |1 1 1 1 1 0|imm26 |
* Syntax: call imm26
* Operation: ra = pc + 4; pc = pc + sign_extend(imm26<<2)
*/
if (0x3e == (insn >> 26)) {
Elf_Sword imm26 = symvalue +rela->r_addend - (Elf_Addr)where;
imm26 = (imm26 >> 2) & 0x3ffffff;
insn = 0xf8000000 + imm26;
*where = insn;
}
break;
case R_TYPE(BRANCH):
insn = *where;
tmp = symvalue + rela->r_addend - (Elf_Addr)where;
tmp = (Elf32_Sword)tmp >> 2;
if (((Elf32_Sword)tmp > 0x7fff) || ((Elf32_Sword)tmp < -0x8000)){
printf("BRANCH Overflow\n");
return false;
}
*where = (*where & 0xffff0000) | (tmp & 0xffff);
break;
case R_TYPE(32):
*where = symvalue + rela->r_addend;
break;
default:
rtems_rtl_set_error (EINVAL, "rela type record not supported");
printf("Unsupported reloc types\n");
return false;
}
if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) {
printf("rela relocation type is %ld\n", ELF_R_TYPE(rela->r_info));
printf("relocated address 0x%08lx\n", (Elf_Addr)where);
}
return true;
}
bool
rtems_rtl_elf_relocate_rel (const rtems_rtl_obj* obj,
const Elf_Rel* rel,
const rtems_rtl_obj_sect* sect,
const char* symname,
const Elf_Byte syminfo,
const Elf_Word symvalue)
{
rtems_rtl_set_error (EINVAL, "rela type record not supported");
return false;
}
bool
rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj,
const char* name,
uint32_t flags)
{
return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags);
}
bool
rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj)
{
return rtems_rtl_elf_unwind_dw2_register (obj);
}
bool
rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj)
{
return rtems_rtl_elf_unwind_dw2_deregister (obj);
}
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