105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
/**
|
|
* \brief x86_64 specific relocations
|
|
* \author Sebastian Sumpf
|
|
* \date 2014-10-26
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2014 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__X86_64__RELOCATION_H_
|
|
#define _INCLUDE__X86_64__RELOCATION_H_
|
|
|
|
#include <relocation_generic.h>
|
|
|
|
namespace Linker {
|
|
|
|
/**
|
|
* Relocation types
|
|
*/
|
|
enum Reloc_types {
|
|
R_64 = 1, /* add 64 bit symbol value. */
|
|
R_COPY = 5,
|
|
R_GLOB_DAT = 6, /* GOT entry to data address */
|
|
R_JMPSLOT = 7, /* jump slot */
|
|
R_RELATIVE = 8, /* add load addr of shared object */
|
|
};
|
|
|
|
class Reloc_non_plt;
|
|
|
|
typedef Reloc_plt_generic<Elf::Rela, DT_RELA, R_JMPSLOT> Reloc_plt;
|
|
typedef Reloc_jmpslot_generic<Elf::Rela, DT_RELA, false> Reloc_jmpslot;
|
|
typedef Reloc_bind_now_generic<Elf::Rela, DT_RELA> Reloc_bind_now;
|
|
};
|
|
|
|
class Linker::Reloc_non_plt : public Reloc_non_plt_generic
|
|
{
|
|
private:
|
|
/**
|
|
* Relative relocation (reloc base + addend)
|
|
*/
|
|
void _relative(Elf::Rela const *rel, Elf::Addr *addr)
|
|
{
|
|
trace("64", _dag->obj->reloc_base(), rel->addend, 0);
|
|
*addr = _dag->obj->reloc_base() + rel->addend;
|
|
}
|
|
|
|
/**
|
|
* GOT entry to data address or 64 bit symbol (addend = true),
|
|
* (reloc base of containing ojbect + symbol value (+ addend)
|
|
*/
|
|
void _glob_dat_64(Elf::Rela const *rel, Elf::Addr *addr, bool addend)
|
|
{
|
|
Elf::Addr reloc_base;
|
|
Elf::Sym const *sym;
|
|
|
|
if (!(sym = locate_symbol(rel->sym(), _dag, &reloc_base)))
|
|
return;
|
|
|
|
*addr = reloc_base + sym->st_value + (addend ? rel->addend : 0);
|
|
if (verbose_reloc(_dag))
|
|
PDBG("GLOB DAT %p -> %llx r %llx v %llx", addr, *addr, reloc_base,
|
|
sym->st_value);
|
|
}
|
|
|
|
public:
|
|
|
|
Reloc_non_plt(Dag const *dag, Elf::Rela const *rel, unsigned long size)
|
|
: Reloc_non_plt_generic(dag)
|
|
{
|
|
Elf::Rela const *end = rel + (size / sizeof(Elf::Rela));
|
|
|
|
for (; rel < end; rel++) {
|
|
Elf::Addr *addr = (Elf::Addr *)(_dag->obj->reloc_base() + rel->offset);
|
|
|
|
switch(rel->type()) {
|
|
case R_64: _glob_dat_64(rel, addr, true); break;
|
|
case R_GLOB_DAT: _glob_dat_64(rel, addr, false); break;
|
|
case R_COPY: _copy<Elf::Rela>(rel, addr); break;
|
|
case R_RELATIVE: _relative(rel, addr); break;
|
|
|
|
default:
|
|
trace("UNKRELA", rel->type(), 0, 0);
|
|
if (!_dag->obj->is_linker()) {
|
|
PWRN("LD: Unkown relocation %u", rel->type());
|
|
throw Incompatible();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
Reloc_non_plt(Dag const *dag, Elf::Rel const *, unsigned long, bool)
|
|
: Reloc_non_plt_generic(dag)
|
|
{
|
|
PERR("LD: DT_REL not supported");
|
|
throw Incompatible();
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__X86_64__RELOCATION_H_ */
|