Subversion Repositories or1k

/* Machine-dependent ELF dynamic relocation inline functions.  OpenRISC version.

   Copyright (C) 1995-2002, 2005 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Based on sysdeps/powerpc/powerpc32/dl-machine.h.

   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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* FIXME: severely fucked */

#ifndef dl_machine_h

#define dl_machine_h

#define ELF_MACHINE_NAME "or32"

#include <assert.h>

/* Return nonzero iff ELF header is compatible with the running host.  */

static inline int

elf_machine_matches_host (const Elf32_Ehdr *ehdr)

{

  return ehdr->e_machine == EM_OPENRISC;

}

/* Return the link-time address of _DYNAMIC, stored as

   the first value in the GOT. */

static inline Elf32_Addr

elf_machine_dynamic (void)

{

  /* FIXME */

  return NULL;

}

/* Return the run-time load address of the shared object.  */

static inline Elf32_Addr

elf_machine_load_address (void)

{

  /* FIXME */

  return NULL;

}

#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */

/* The PLT uses Elf32_Rela relocs.  */

#define elf_machine_relplt elf_machine_rela

/* This code is used in dl-runtime.c to call the `fixup' function

   and then redirect to the address it returns.  It is called

   from code built in the PLT by elf_machine_runtime_setup.  */

#define ELF_MACHINE_RUNTIME_TRAMPOLINE /* FIXME */

/* Mask identifying addresses reserved for the user program,

   where the dynamic linker should not map anything.  */

#define ELF_MACHINE_USER_ADDRESS_MASK   0xf0000000UL

/* The actual _start code is in dl-start.S.  Use a really

   ugly bit of assembler to let dl-start.o see _dl_start.  */

#define RTLD_START asm (".globl _dl_start");

/* FIXME */

#define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) 0

/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so

   PLT entries should not be allowed to define the value.

   ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one

   of the main executable's symbols, as for a COPY reloc.  */

/* We never want to use a PLT entry as the destination of a

   reloc, when what is being relocated is a branch. This is

   partly for efficiency, but mostly so we avoid loops.  */

#define elf_machine_type_class(type) \

  ((((type) == R_PPC_JMP_SLOT                           \

    || (type) == R_PPC_REL24                            \

    || (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT)   \

   | (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY))

/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */

#define ELF_MACHINE_JMP_SLOT    R_PPC_JMP_SLOT

/* The PowerPC never uses REL relocations.  */

#define ELF_MACHINE_NO_REL 1

/* FIXME */

#define elf_machine_runtime_setup 0

static inline void

elf_machine_lazy_rel (struct link_map *map,

                      Elf32_Addr l_addr, const Elf32_Rela *reloc)

{

  /* elf_machine_runtime_setup handles this. */

}

/* Change the PLT entry whose reloc is 'reloc' to call the actual routine.  */

extern Elf32_Addr __elf_machine_fixup_plt (struct link_map *map,

                                           const Elf32_Rela *reloc,

                                           Elf32_Addr *reloc_addr,

                                           Elf32_Addr finaladdr);

static inline Elf32_Addr

elf_machine_fixup_plt (struct link_map *map, lookup_t t,

                       const Elf32_Rela *reloc,

                       Elf32_Addr *reloc_addr, Elf64_Addr finaladdr)

{

  return __elf_machine_fixup_plt (map, reloc, reloc_addr, finaladdr);

}

/* Return the final value of a plt relocation.  */

static inline Elf32_Addr

elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,

                       Elf32_Addr value)

{

  return value + reloc->r_addend;

}

#endif /* dl_machine_h */

#ifdef RESOLVE

/* FIXME */

/* Perform the relocation specified by RELOC and SYM (which is fully resolved).

   LOADADDR is the load address of the object; INFO is an array indexed

   by DT_* of the .dynamic section info.  */

inline void

elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,

                  const Elf32_Sym *sym, const struct r_found_version *version,

                  Elf32_Addr *const reloc_addr)

{

  const Elf32_Sym *const refsym = sym;

  Elf32_Word finaladdr;

  const int rinfo = ELF32_R_TYPE (reloc->r_info);

#ifndef RESOLVE_CONFLICT_FIND_MAP

  if (__builtin_expect (rinfo == R_PPC_NONE, 0))

    return;

  /* The condition on the next two lines is a hack around a bug in Solaris

     tools on Sparc.  It's not clear whether it should really be here at all,

     but if not the binutils need to be changed.  */

  if (rinfo == R_PPC_RELATIVE

      || (sym->st_shndx != SHN_UNDEF

          && ELF32_ST_BIND (sym->st_info) == STB_LOCAL))

    {

      /* Has already been relocated.  */

      Elf32_Word loadbase = map->l_addr;

      finaladdr = loadbase + reloc->r_addend;

    }

  else

    {

      Elf32_Word loadbase

        = (Elf32_Word) (char *) (RESOLVE (&sym, version,

                                          ELF32_R_TYPE(reloc->r_info)));

      if (sym == NULL)

        {

          /* Weak symbol that wasn't actually defined anywhere.  */

          assert (loadbase == 0);

          finaladdr = reloc->r_addend;

        }

      else

        finaladdr = (loadbase + (Elf32_Word) (char *) sym->st_value

                     + reloc->r_addend);

    }

#else

  finaladdr = reloc->r_addend;

  if (rinfo == R_PPC_JMP_SLOT)

    RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr);

#endif

  /* A small amount of code is duplicated here for speed.  In libc,

     more than 90% of the relocs are R_PPC_RELATIVE; in the X11 shared

     libraries, 60% are R_PPC_RELATIVE, 24% are R_PPC_GLOB_DAT or

     R_PPC_ADDR32, and 16% are R_PPC_JMP_SLOT (which this routine

     wouldn't usually handle).  As an bonus, doing this here allows

     the switch statement in __process_machine_rela to work.  */

  if (rinfo == R_PPC_RELATIVE

      || rinfo == R_PPC_GLOB_DAT

      || rinfo == R_PPC_ADDR32)

    {

      *reloc_addr = finaladdr;

    }

  /* FIXME */

}

static inline void

elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,

                           Elf32_Addr *const reloc_addr)

{

  *reloc_addr = l_addr + reloc->r_addend;

}

/* The SVR4 ABI specifies that the JMPREL relocs must be inside the

   DT_RELA table.  */

#define ELF_MACHINE_PLTREL_OVERLAP 1

#endif /* RESOLVE */