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[/] [or1k/] [trunk/] [gdb-5.3/] [bfd/] [elf32-xstormy16.c] - Blame information for rev 1765

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/* XSTORMY16-specific support for 32-bit ELF.
   Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
 
This file is part of BFD, the Binary File Descriptor library.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program 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 General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/xstormy16.h"
#include "libiberty.h"
 
/* Forward declarations.  */
static reloc_howto_type * xstormy16_reloc_type_lookup
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void xstormy16_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static bfd_reloc_status_type xstormy16_elf_24_reloc
  PARAMS ((bfd *abfd, arelent *reloc_entry, asymbol *symbol,
           PTR data, asection *input_section, bfd *output_bfd,
           char **error_message));
static boolean xstormy16_elf_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
           const Elf_Internal_Rela *));
static boolean xstormy16_relax_plt_check
  PARAMS ((struct elf_link_hash_entry *, PTR));
static boolean xstormy16_relax_plt_realloc
  PARAMS ((struct elf_link_hash_entry *, PTR));
static boolean xstormy16_elf_relax_section
  PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
           boolean *again));
static boolean xstormy16_elf_always_size_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean xstormy16_elf_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
           Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean xstormy16_elf_finish_dynamic_sections
  PARAMS((bfd *, struct bfd_link_info *));
static boolean xstormy16_elf_gc_sweep_hook
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
           const Elf_Internal_Rela *));
static asection * xstormy16_elf_gc_mark_hook
  PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
           struct elf_link_hash_entry *, Elf_Internal_Sym *));
 
static reloc_howto_type xstormy16_elf_howto_table [] =
{
  /* This reloc does nothing.  */
  HOWTO (R_XSTORMY16_NONE,      /* type */
         0,                      /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_NONE",    /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0,                      /* dst_mask */
         false),                /* pcrel_offset */
 
  /* A 32 bit absolute relocation.  */
  HOWTO (R_XSTORMY16_32,        /* type */
         0,                      /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_dont, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_32",      /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         false),                /* pcrel_offset */
 
  /* A 16 bit absolute relocation.  */
  HOWTO (R_XSTORMY16_16,        /* type */
         0,                      /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         16,                    /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_16",      /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         false),                /* pcrel_offset */
 
  /* An 8 bit absolute relocation.  */
  HOWTO (R_XSTORMY16_8, /* type */
         0,                      /* rightshift */
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
         8,                     /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_8",       /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         false),                /* pcrel_offset */
 
  /* A 32 bit pc-relative relocation.  */
  HOWTO (R_XSTORMY16_PC32,      /* type */
         0,                      /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         true,                  /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_dont, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_PC32",    /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         true),         /* pcrel_offset */
 
  /* A 16 bit pc-relative relocation.  */
  HOWTO (R_XSTORMY16_PC16,      /* type */
         0,                      /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         16,                    /* bitsize */
         true,                  /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_PC16",    /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         true),         /* pcrel_offset */
 
  /* An 8 bit pc-relative relocation.  */
  HOWTO (R_XSTORMY16_PC8,       /* type */
         0,                      /* rightshift */
         0,                      /* size (0 = byte, 1 = short, 2 = long) */
         8,                     /* bitsize */
         true,                  /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_PC8",     /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         true),         /* pcrel_offset */
 
  /* A 12-bit pc-relative relocation suitable for the branch instructions.  */
  HOWTO (R_XSTORMY16_REL_12,    /* type */
         1,                     /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         11,                    /* bitsize */
         true,                  /* pc_relative */
         1,                     /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_REL_12",  /* name */
         true,                  /* partial_inplace */
         0,                      /* src_mask */
         0x0fff,                /* dst_mask */
         true),         /* pcrel_offset */
 
  /* A 24-bit absolute relocation suitable for the jump instructions.  */
  HOWTO (R_XSTORMY16_24,        /* type */
         0,                      /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         24,                    /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_unsigned, /* complain_on_overflow */
         xstormy16_elf_24_reloc,        /* special_function */
         "R_XSTORMY16_24",      /* name */
         true,                  /* partial_inplace */
         0,                      /* src_mask */
         0xffff00ff,            /* dst_mask */
         true),         /* pcrel_offset */
 
  /* A 16 bit absolute relocation to a function pointer.  */
  HOWTO (R_XSTORMY16_FPTR16,    /* type */
         0,                      /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         16,                    /* bitsize */
         false,                 /* pc_relative */
         0,                      /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_XSTORMY16_FPTR16",  /* name */
         false,                 /* partial_inplace */
         0,                      /* src_mask */
         0xffffffff,            /* dst_mask */
         false),                /* pcrel_offset */
};
 
static reloc_howto_type xstormy16_elf_howto_table2 [] =
{
  /* GNU extension to record C++ vtable hierarchy */
  HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         0,                     /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_dont, /* complain_on_overflow */
         NULL,                  /* special_function */
         "R_XSTORMY16_GNU_VTINHERIT", /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */
 
  /* GNU extension to record C++ vtable member usage */
  HOWTO (R_XSTORMY16_GNU_VTENTRY,     /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         0,                     /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_dont, /* complain_on_overflow */
         _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
         "R_XSTORMY16_GNU_VTENTRY",   /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */
 
};
 
/* Map BFD reloc types to XSTORMY16 ELF reloc types.  */
 
typedef struct xstormy16_reloc_map
{
  bfd_reloc_code_real_type  bfd_reloc_val;
  unsigned int              xstormy16_reloc_val;
  reloc_howto_type *        table;
} reloc_map;
 
static const reloc_map xstormy16_reloc_map [] =
{
  { BFD_RELOC_NONE,                 R_XSTORMY16_NONE,          xstormy16_elf_howto_table },
  { BFD_RELOC_32,                   R_XSTORMY16_32,            xstormy16_elf_howto_table },
  { BFD_RELOC_16,                   R_XSTORMY16_16,            xstormy16_elf_howto_table },
  { BFD_RELOC_8,                    R_XSTORMY16_8,             xstormy16_elf_howto_table },
  { BFD_RELOC_32_PCREL,             R_XSTORMY16_PC32,          xstormy16_elf_howto_table },
  { BFD_RELOC_16_PCREL,             R_XSTORMY16_PC16,          xstormy16_elf_howto_table },
  { BFD_RELOC_8_PCREL,              R_XSTORMY16_PC8,           xstormy16_elf_howto_table },
  { BFD_RELOC_XSTORMY16_REL_12,     R_XSTORMY16_REL_12,        xstormy16_elf_howto_table },
  { BFD_RELOC_XSTORMY16_24,         R_XSTORMY16_24,            xstormy16_elf_howto_table },
  { BFD_RELOC_XSTORMY16_FPTR16,     R_XSTORMY16_FPTR16,        xstormy16_elf_howto_table },
  { BFD_RELOC_VTABLE_INHERIT,       R_XSTORMY16_GNU_VTINHERIT, xstormy16_elf_howto_table2 },
  { BFD_RELOC_VTABLE_ENTRY,         R_XSTORMY16_GNU_VTENTRY,   xstormy16_elf_howto_table2 },
};
 
static reloc_howto_type *
xstormy16_reloc_type_lookup (abfd, code)
     bfd * abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  unsigned int i;
 
  for (i = ARRAY_SIZE (xstormy16_reloc_map); --i;)
    {
      const reloc_map * entry;
 
      entry = xstormy16_reloc_map + i;
 
      if (entry->bfd_reloc_val == code)
        return entry->table + (entry->xstormy16_reloc_val
                               - entry->table[0].type);
    }
 
  return NULL;
}
 
/* Set the howto pointer for an XSTORMY16 ELF reloc.  */
 
static void
xstormy16_info_to_howto_rela (abfd, cache_ptr, dst)
     bfd * abfd ATTRIBUTE_UNUSED;
     arelent * cache_ptr;
     Elf32_Internal_Rela * dst;
{
  unsigned int r_type = ELF32_R_TYPE (dst->r_info);
 
  if (r_type <= (unsigned int) R_XSTORMY16_FPTR16)
    cache_ptr->howto = &xstormy16_elf_howto_table [r_type];
  else if (r_type - R_XSTORMY16_GNU_VTINHERIT
           <= (unsigned int) R_XSTORMY16_GNU_VTENTRY)
    cache_ptr->howto
      = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT];
  else
    abort ();
}
 
/* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement.  */
 
static bfd_reloc_status_type
xstormy16_elf_24_reloc (abfd, reloc_entry, symbol, data, input_section,
                         output_bfd, error_message)
     bfd *abfd;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data;
     asection *input_section;
     bfd *output_bfd;
     char **error_message ATTRIBUTE_UNUSED;
{
  bfd_vma relocation, x;
 
  if (output_bfd != NULL)
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }
 
  if (reloc_entry->address > input_section->_cooked_size)
    return bfd_reloc_outofrange;
 
  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;
 
  relocation += symbol->section->output_section->vma;
  relocation += symbol->section->output_offset;
  relocation += reloc_entry->addend;
 
  x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
  x &= 0x0000ff00;
  x |= relocation & 0xff;
  x |= (relocation << 8) & 0xffff0000;
  bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address);
 
  if (relocation & ~ (bfd_vma) 0xffffff)
    return bfd_reloc_overflow;
 
  return bfd_reloc_ok;
}
 
/* We support 16-bit pointers to code above 64k by generating a thunk
   below 64k containing a JMPF instruction to the final address.  We
   cannot, unfortunately, minimize the number of thunks unless the
   -relax switch is given, as otherwise we have no idea where the
   sections will fall in the address space.  */
 
static boolean
xstormy16_elf_check_relocs (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  const Elf_Internal_Rela *rel, *relend;
  struct elf_link_hash_entry **sym_hashes;
  Elf_Internal_Shdr *symtab_hdr;
  bfd_vma *local_plt_offsets;
  asection *splt;
  bfd *dynobj;
 
  if (info->relocateable)
    return true;
 
  symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  local_plt_offsets = elf_local_got_offsets (abfd);
  splt = NULL;
  dynobj = elf_hash_table(info)->dynobj;
 
  relend = relocs + sec->reloc_count;
  for (rel = relocs; rel < relend; ++rel)
    {
      unsigned long r_symndx;
      struct elf_link_hash_entry *h;
      bfd_vma *offset;
 
      r_symndx = ELF32_R_SYM (rel->r_info);
      if (r_symndx < symtab_hdr->sh_info)
        h = NULL;
      else
        {
          h = sym_hashes[r_symndx - symtab_hdr->sh_info];
          while (h->root.type == bfd_link_hash_indirect
                 || h->root.type == bfd_link_hash_warning)
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
        }
 
      switch (ELF32_R_TYPE (rel->r_info))
        {
          /* This relocation describes a 16-bit pointer to a function.
             We may need to allocate a thunk in low memory; reserve memory
             for it now.  */
        case R_XSTORMY16_FPTR16:
          if (rel->r_addend != 0)
            {
              (*info->callbacks->warning)
                (info, _("non-zero addend in @fptr reloc"), 0,
                 abfd, 0, 0);
            }
 
          if (dynobj == NULL)
            elf_hash_table (info)->dynobj = dynobj = abfd;
          if (splt == NULL)
            {
              splt = bfd_get_section_by_name (dynobj, ".plt");
              if (splt == NULL)
                {
                  splt = bfd_make_section (dynobj, ".plt");
                  if (splt == NULL
                      || ! bfd_set_section_flags (dynobj, splt,
                                                  (SEC_ALLOC
                                                   | SEC_LOAD
                                                   | SEC_HAS_CONTENTS
                                                   | SEC_IN_MEMORY
                                                   | SEC_LINKER_CREATED
                                                   | SEC_READONLY
                                                   | SEC_CODE))
                      || ! bfd_set_section_alignment (dynobj, splt, 1))
                    return false;
                }
            }
 
          if (h != NULL)
            offset = &h->plt.offset;
          else
            {
              if (local_plt_offsets == NULL)
                {
                  size_t size;
                  unsigned int i;
 
                  size = symtab_hdr->sh_info * sizeof (bfd_vma);
                  local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size);
                  if (local_plt_offsets == NULL)
                    return false;
                  elf_local_got_offsets (abfd) = local_plt_offsets;
 
                  for (i = 0; i < symtab_hdr->sh_info; i++)
                    local_plt_offsets[i] = (bfd_vma) -1;
                }
              offset = &local_plt_offsets[r_symndx];
            }
 
          if (*offset == (bfd_vma) -1)
            {
              *offset = splt->_raw_size;
              splt->_raw_size += 4;
            }
          break;
 
          /* This relocation describes the C++ object vtable hierarchy.
             Reconstruct it for later use during GC.  */
        case R_XSTORMY16_GNU_VTINHERIT:
          if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
            return false;
          break;
 
          /* This relocation describes which C++ vtable entries are actually
             used.  Record for later use during GC.  */
        case R_XSTORMY16_GNU_VTENTRY:
          if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
            return false;
          break;
        }
    }
 
  return true;
}
 
/* A subroutine of xstormy16_elf_relax_section.  If the global symbol H
   is within the low 64k, remove any entry for it in the plt.  */
 
struct relax_plt_data
{
  asection *splt;
  boolean *again;
};
 
static boolean
xstormy16_relax_plt_check (h, xdata)
     struct elf_link_hash_entry *h;
     PTR xdata;
{
  struct relax_plt_data *data = (struct relax_plt_data *) xdata;
 
  if (h->root.type == bfd_link_hash_warning)
    h = (struct elf_link_hash_entry *) h->root.u.i.link;
 
  if (h->plt.offset != (bfd_vma) -1)
    {
      bfd_vma address;
 
      if (h->root.type == bfd_link_hash_undefined
          || h->root.type == bfd_link_hash_undefweak)
        address = 0;
      else
        address = (h->root.u.def.section->output_section->vma
                   + h->root.u.def.section->output_offset
                   + h->root.u.def.value);
 
      if (address <= 0xffff)
        {
          h->plt.offset = -1;
          data->splt->_cooked_size -= 4;
          *data->again = true;
        }
    }
 
  return true;
}
 
/* A subroutine of xstormy16_elf_relax_section.  If the global symbol H
   previously had a plt entry, give it a new entry offset.  */
 
static boolean
xstormy16_relax_plt_realloc (h, xdata)
     struct elf_link_hash_entry *h;
     PTR xdata;
{
  bfd_vma *entry = (bfd_vma *) xdata;
 
  if (h->root.type == bfd_link_hash_warning)
    h = (struct elf_link_hash_entry *) h->root.u.i.link;
 
  if (h->plt.offset != (bfd_vma) -1)
    {
      h->plt.offset = *entry;
      *entry += 4;
    }
 
  return true;
}
 
static boolean
xstormy16_elf_relax_section (dynobj, splt, info, again)
     bfd *dynobj;
     asection *splt;
     struct bfd_link_info *info;
     boolean *again;
{
  struct relax_plt_data relax_plt_data;
  bfd *ibfd;
 
  /* Assume nothing changes.  */
  *again = false;
 
  if (info->relocateable)
    return true;
 
  /* We only relax the .plt section at the moment.  */
  if (dynobj != elf_hash_table (info)->dynobj
      || strcmp (splt->name, ".plt") != 0)
    return true;
 
  /* Quick check for an empty plt.  */
  if (splt->_raw_size == 0)
    return true;
 
  /* If this is the first time we have been called for this section,
     initialize the cooked size.  */
  if (splt->_cooked_size == 0)
    splt->_cooked_size = splt->_raw_size;
 
  /* Map across all global symbols; see which ones happen to
     fall in the low 64k.  */
  relax_plt_data.splt = splt;
  relax_plt_data.again = again;
  elf_link_hash_traverse (elf_hash_table (info), xstormy16_relax_plt_check,
                          &relax_plt_data);
 
  /* Likewise for local symbols, though that's somewhat less convenient
     as we have to walk the list of input bfds and swap in symbol data.  */
  for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
    {
      bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
      Elf_Internal_Shdr *symtab_hdr;
      Elf_Internal_Sym *isymbuf = NULL;
      unsigned int idx;
 
      if (! local_plt_offsets)
        continue;
 
      symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
      if (symtab_hdr->sh_info != 0)
        {
          isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
          if (isymbuf == NULL)
            isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr,
                                            symtab_hdr->sh_info, 0,
                                            NULL, NULL, NULL);
          if (isymbuf == NULL)
            return false;
        }
 
      for (idx = 0; idx < symtab_hdr->sh_info; ++idx)
        {
          Elf_Internal_Sym *isym;
          asection *tsec;
          bfd_vma address;
 
          if (local_plt_offsets[idx] == (bfd_vma) -1)
            continue;
 
          isym = &isymbuf[idx];
          if (isym->st_shndx == SHN_UNDEF)
            continue;
          else if (isym->st_shndx == SHN_ABS)
            tsec = bfd_abs_section_ptr;
          else if (isym->st_shndx == SHN_COMMON)
            tsec = bfd_com_section_ptr;
          else
            tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx);
 
          address = (tsec->output_section->vma
                     + tsec->output_offset
                     + isym->st_value);
          if (address <= 0xffff)
            {
              local_plt_offsets[idx] = -1;
              splt->_cooked_size -= 4;
              *again = true;
            }
        }
 
      if (isymbuf != NULL
          && symtab_hdr->contents != (unsigned char *) isymbuf)
        {
          if (! info->keep_memory)
            free (isymbuf);
          else
            {
              /* Cache the symbols for elf_link_input_bfd.  */
              symtab_hdr->contents = (unsigned char *) isymbuf;
            }
        }
    }
 
  /* If we changed anything, walk the symbols again to reallocate
     .plt entry addresses.  */
  if (*again && splt->_cooked_size > 0)
    {
      bfd_vma entry = 0;
 
      elf_link_hash_traverse (elf_hash_table (info),
                              xstormy16_relax_plt_realloc, &entry);
 
      for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next)
        {
          bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd);
          unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info;
          unsigned int idx;
 
          if (! local_plt_offsets)
            continue;
 
          for (idx = 0; idx < nlocals; ++idx)
            if (local_plt_offsets[idx] != (bfd_vma) -1)
              {
                local_plt_offsets[idx] = entry;
                entry += 4;
              }
        }
    }
 
  splt->_raw_size = splt->_cooked_size;
  return true;
}
 
static boolean
xstormy16_elf_always_size_sections (output_bfd, info)
     bfd *output_bfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *splt;
 
  if (info->relocateable)
    return true;
 
  dynobj = elf_hash_table (info)->dynobj;
  if (dynobj == NULL)
    return true;
 
  splt = bfd_get_section_by_name (dynobj, ".plt");
  BFD_ASSERT (splt != NULL);
 
  splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->_raw_size);
  if (splt->contents == NULL)
    return false;
 
  return true;
}
 
/* Relocate an XSTORMY16 ELF section.
 
   The RELOCATE_SECTION function is called by the new ELF backend linker
   to handle the relocations for a section.
 
   The relocs are always passed as Rela structures; if the section
   actually uses Rel structures, the r_addend field will always be
   zero.
 
   This function is responsible for adjusting the section contents as
   necessary, and (if using Rela relocs and generating a relocateable
   output file) adjusting the reloc addend as necessary.
 
   This function does not have to worry about setting the reloc
   address or the reloc symbol index.
 
   LOCAL_SYMS is a pointer to the swapped in local symbols.
 
   LOCAL_SECTIONS is an array giving the section in the input file
   corresponding to the st_shndx field of each local symbol.
 
   The global hash table entry for the global symbols can be found
   via elf_sym_hashes (input_bfd).
 
   When generating relocateable output, this function must handle
   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
   going to be the section symbol corresponding to the output
   section, which means that the addend must be adjusted
   accordingly.  */
 
static boolean
xstormy16_elf_relocate_section (output_bfd, info, input_bfd, input_section,
                           contents, relocs, local_syms, local_sections)
     bfd *                   output_bfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *  info;
     bfd *                   input_bfd;
     asection *              input_section;
     bfd_byte *              contents;
     Elf_Internal_Rela *     relocs;
     Elf_Internal_Sym *      local_syms;
     asection **             local_sections;
{
  Elf_Internal_Shdr *           symtab_hdr;
  struct elf_link_hash_entry ** sym_hashes;
  Elf_Internal_Rela *           rel;
  Elf_Internal_Rela *           relend;
  bfd *dynobj;
  asection *splt;
 
  if (info->relocateable)
    return true;
 
  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  relend     = relocs + input_section->reloc_count;
 
  dynobj = elf_hash_table (info)->dynobj;
  splt = NULL;
  if (dynobj != NULL)
    splt = bfd_get_section_by_name (dynobj, ".plt");
 
  for (rel = relocs; rel < relend; rel ++)
    {
      reloc_howto_type *           howto;
      unsigned long                r_symndx;
      Elf_Internal_Sym *           sym;
      asection *                   sec;
      struct elf_link_hash_entry * h;
      bfd_vma                      relocation;
      bfd_reloc_status_type        r;
      const char *                 name = NULL;
      int                          r_type;
 
      r_type = ELF32_R_TYPE (rel->r_info);
 
      if (   r_type == R_XSTORMY16_GNU_VTINHERIT
          || r_type == R_XSTORMY16_GNU_VTENTRY)
        continue;
 
      r_symndx = ELF32_R_SYM (rel->r_info);
      howto  = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info);
      h      = NULL;
      sym    = NULL;
      sec    = NULL;
 
      if (r_symndx < symtab_hdr->sh_info)
        {
          sym = local_syms + r_symndx;
          sec = local_sections [r_symndx];
          relocation = (sec->output_section->vma
                        + sec->output_offset
                        + sym->st_value);
 
          name = bfd_elf_string_from_elf_section
            (input_bfd, symtab_hdr->sh_link, sym->st_name);
          name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
        }
      else
        {
          h = sym_hashes [r_symndx - symtab_hdr->sh_info];
 
          while (h->root.type == bfd_link_hash_indirect
                 || h->root.type == bfd_link_hash_warning)
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
 
          name = h->root.root.string;
 
          if (h->root.type == bfd_link_hash_defined
              || h->root.type == bfd_link_hash_defweak)
            {
              sec = h->root.u.def.section;
              relocation = (h->root.u.def.value
                            + sec->output_section->vma
                            + sec->output_offset);
            }
          else if (h->root.type == bfd_link_hash_undefweak)
            {
              relocation = 0;
            }
          else
            {
              if (! ((*info->callbacks->undefined_symbol)
                     (info, h->root.root.string, input_bfd,
                      input_section, rel->r_offset, true)))
                return false;
              relocation = 0;
            }
        }
 
      switch (ELF32_R_TYPE (rel->r_info))
        {
        case R_XSTORMY16_24:
          {
            bfd_vma reloc = relocation + rel->r_addend;
            unsigned int x;
 
            x = bfd_get_32 (input_bfd, contents + rel->r_offset);
            x &= 0x0000ff00;
            x |= reloc & 0xff;
            x |= (reloc << 8) & 0xffff0000;
            bfd_put_32 (input_bfd, x, contents + rel->r_offset);
 
            if (reloc & ~0xffffff)
              r = bfd_reloc_overflow;
            else
              r = bfd_reloc_ok;
            break;
          }
 
        case R_XSTORMY16_FPTR16:
          {
            bfd_vma *plt_offset;
 
            if (h != NULL)
              plt_offset = &h->plt.offset;
            else
              plt_offset = elf_local_got_offsets (input_bfd) + r_symndx;
 
            if (relocation <= 0xffff)
              {
                /* If the symbol is in range for a 16-bit address, we should
                   have deallocated the plt entry in relax_section.  */
                BFD_ASSERT (*plt_offset == (bfd_vma) -1);
              }
            else
              {
                /* If the symbol is out of range for a 16-bit address,
                   we must have allocated a plt entry.  */
                BFD_ASSERT (*plt_offset != (bfd_vma) -1);
 
                /* If this is the first time we've processed this symbol,
                   fill in the plt entry with the correct symbol address.  */
                if ((*plt_offset & 1) == 0)
                  {
                    unsigned int x;
 
                    x = 0x00000200;  /* jmpf */
                    x |= relocation & 0xff;
                    x |= (relocation << 8) & 0xffff0000;
                    bfd_put_32 (input_bfd, x, splt->contents + *plt_offset);
                    *plt_offset |= 1;
                  }
 
                relocation = (splt->output_section->vma
                              + splt->output_offset
                              + (*plt_offset & -2));
              }
            r = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                          contents, rel->r_offset,
                                          relocation, 0);
            break;
          }
 
        default:
          r = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                        contents, rel->r_offset,
                                        relocation, rel->r_addend);
          break;
        }
 
      if (r != bfd_reloc_ok)
        {
          const char * msg = (const char *) NULL;
 
          switch (r)
            {
            case bfd_reloc_overflow:
              r = info->callbacks->reloc_overflow
                (info, name, howto->name, (bfd_vma) 0,
                 input_bfd, input_section, rel->r_offset);
              break;
 
            case bfd_reloc_undefined:
              r = info->callbacks->undefined_symbol
                (info, name, input_bfd, input_section, rel->r_offset,
                 true);
              break;
 
            case bfd_reloc_outofrange:
              msg = _("internal error: out of range error");
              break;
 
            case bfd_reloc_notsupported:
              msg = _("internal error: unsupported relocation error");
              break;
 
            case bfd_reloc_dangerous:
              msg = _("internal error: dangerous relocation");
              break;
 
            default:
              msg = _("internal error: unknown error");
              break;
            }
 
          if (msg)
            r = info->callbacks->warning
              (info, msg, name, input_bfd, input_section, rel->r_offset);
 
          if (! r)
            return false;
        }
    }
 
  return true;
}
 
/* This must exist if dynobj is ever set.  */
 
static boolean
xstormy16_elf_finish_dynamic_sections (abfd, info)
     bfd *abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *splt;
 
  /* As an extra sanity check, verify that all plt entries have
     been filled in.  */
 
  if ((dynobj = elf_hash_table (info)->dynobj) != NULL
      && (splt = bfd_get_section_by_name (dynobj, ".plt")) != NULL)
    {
      bfd_byte *contents = splt->contents;
      unsigned int i, size = splt->_raw_size;
      for (i = 0; i < size; i += 4)
        {
          unsigned int x = bfd_get_32 (dynobj, contents + i);
          BFD_ASSERT (x != 0);
        }
    }
 
  return true;
}
 
/* Return the section that should be marked against GC for a given
   relocation.  */
 
static asection *
xstormy16_elf_gc_mark_hook (sec, info, rel, h, sym)
     asection *                   sec;
     struct bfd_link_info *       info ATTRIBUTE_UNUSED;
     Elf_Internal_Rela *          rel;
     struct elf_link_hash_entry * h;
     Elf_Internal_Sym *           sym;
{
  if (h != NULL)
    {
      switch (ELF32_R_TYPE (rel->r_info))
        {
        case R_XSTORMY16_GNU_VTINHERIT:
        case R_XSTORMY16_GNU_VTENTRY:
          break;
 
        default:
          switch (h->root.type)
            {
            case bfd_link_hash_defined:
            case bfd_link_hash_defweak:
              return h->root.u.def.section;
 
            case bfd_link_hash_common:
              return h->root.u.c.p->section;
 
            default:
              break;
            }
        }
    }
  else
    return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
 
  return NULL;
}
 
/* Update the got entry reference counts for the section being removed.  */
 
static boolean
xstormy16_elf_gc_sweep_hook (abfd, info, sec, relocs)
     bfd *                     abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *    info ATTRIBUTE_UNUSED;
     asection *                sec ATTRIBUTE_UNUSED;
     const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
{
  return true;
}
 
#define ELF_ARCH                bfd_arch_xstormy16
#define ELF_MACHINE_CODE        EM_XSTORMY16
#define ELF_MAXPAGESIZE         0x100
 
#define TARGET_LITTLE_SYM       bfd_elf32_xstormy16_vec
#define TARGET_LITTLE_NAME      "elf32-xstormy16"
 
#define elf_info_to_howto_rel                   NULL
#define elf_info_to_howto                       xstormy16_info_to_howto_rela
#define elf_backend_relocate_section            xstormy16_elf_relocate_section
#define elf_backend_gc_mark_hook                xstormy16_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook               xstormy16_elf_gc_sweep_hook
#define elf_backend_check_relocs                xstormy16_elf_check_relocs
#define elf_backend_always_size_sections \
  xstormy16_elf_always_size_sections
#define elf_backend_finish_dynamic_sections \
  xstormy16_elf_finish_dynamic_sections
 
#define elf_backend_can_gc_sections             1
#define elf_backend_rela_normal                 1
 
#define bfd_elf32_bfd_reloc_type_lookup         xstormy16_reloc_type_lookup
#define bfd_elf32_bfd_relax_section             xstormy16_elf_relax_section
 
#include "elf32-target.h"
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[/] [or1k/] [trunk/] [gdb-5.3/] [bfd/] [elf32-xstormy16.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1181	sfurman	`/* XSTORMY16-specific support for 32-bit ELF.`
2			`Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.`
3
4			`This file is part of BFD, the Binary File Descriptor library.`
5
6			`This program is free software; you can redistribute it and/or modify`
7			`it under the terms of the GNU General Public License as published by`
8			`the Free Software Foundation; either version 2 of the License, or`
9			`(at your option) any later version.`
10
11			`This program is distributed in the hope that it will be useful,`
12			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`GNU General Public License for more details.`
15
16			`You should have received a copy of the GNU General Public License`
17			`along with this program; if not, write to the Free Software`
18			`Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */`
19
20			`#include "bfd.h"`
21			`#include "sysdep.h"`
22			`#include "libbfd.h"`
23			`#include "elf-bfd.h"`
24			`#include "elf/xstormy16.h"`
25			`#include "libiberty.h"`
26
27			`/* Forward declarations. */`
28			`static reloc_howto_type * xstormy16_reloc_type_lookup`
29			`PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));`
30			`static void xstormy16_info_to_howto_rela`
31			`PARAMS ((bfd , arelent , Elf32_Internal_Rela *));`
32			`static bfd_reloc_status_type xstormy16_elf_24_reloc`
33			`PARAMS ((bfd abfd, arelent reloc_entry, asymbol *symbol,`
34			`PTR data, asection input_section, bfd output_bfd,`
35			`char **error_message));`
36			`static boolean xstormy16_elf_check_relocs`
37			`PARAMS ((bfd , struct bfd_link_info , asection *,`
38			`const Elf_Internal_Rela *));`
39			`static boolean xstormy16_relax_plt_check`
40			`PARAMS ((struct elf_link_hash_entry *, PTR));`