path: root/sysdeps/tile/dl-machine.h

/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   Based on work contributed by by Carl Pederson & Martin Schwidefsky.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef dl_machine_h
#define dl_machine_h

#ifdef __tilegx__
#define ELF_MACHINE_NAME "tilegx"
#else
#define ELF_MACHINE_NAME "tilepro"
#endif

#include <sys/param.h>
#include <string.h>
#include <link.h>
#include <bits/wordsize.h>
#include <arch/icache.h>
#include <arch/opcode.h>

/* Return nonzero iff ELF header is compatible with the running host.  */
static inline int
elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
{
#if defined __tilegx__
  if (ehdr->e_machine != EM_TILEGX)
    return 0;
# if __WORDSIZE == 32
  return (ehdr->e_ident[EI_CLASS] == ELFCLASS32);
# else
  return (ehdr->e_ident[EI_CLASS] == ELFCLASS64);
# endif
#elif defined __tilepro__
  return ehdr->e_machine == EM_TILEPRO;
#else
# error "Unknown tile architecture."
#endif
}


/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
   first element of the GOT.  This must be inlined in a function which
   uses global data.  */

static inline ElfW(Addr)
elf_machine_dynamic (void)
{
  ElfW(Addr) *got;

#ifdef __tilegx__
  ElfW(Addr) tmp;
  asm( "	{ lnk %0; moveli %1, hw2_last(_GLOBAL_OFFSET_TABLE_ - 1f) }\n"
       "1:	shl16insli %1, %1, hw1(_GLOBAL_OFFSET_TABLE_ - 1b)\n