Add new binutils target: moxie

1 files changed, 378 insertions, 0 deletions

diff --git a/bfd/elf32-moxie.c b/bfd/elf32-moxie.c
new file mode 100644
index 0000000000..e3f01d2e8c
--- /dev/null
+++ b/bfd/elf32-moxie.c
@@ -0,0 +1,378 @@
+/* moxie-specific support for 32-bit ELF.
+   Copyright 2008 Anthony Green.
+   Copyright 2009 Free Software Foundation, Inc.
+
+   Copied from elf32-fr30.c which is..
+   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/moxie.h"
+
+/* Forward declarations.  */
+
+static reloc_howto_type moxie_elf_howto_table [] =
+{
+  /* This reloc does nothing.  */
+  HOWTO (R_MOXIE_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_MOXIE_NONE",		/* name */
+	 FALSE,			/* partial_inplace */
+	 0,			/* src_mask */
+	 0,			/* dst_mask */
+	 FALSE),		/* pcrel_offset */
+
+  /* A 32 bit absolute relocation.  */
+  HOWTO (R_MOXIE_32,		/* 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_MOXIE_32",		/* name */
+	 FALSE,			/* partial_inplace */
+	 0x00000000,		/* src_mask */
+	 0xffffffff,		/* dst_mask */
+	 FALSE),		/* pcrel_offset */
+};
+
+/* Map BFD reloc types to MOXIE ELF reloc types.  */
+
+struct moxie_reloc_map
+{
+  bfd_reloc_code_real_type bfd_reloc_val;
+  unsigned int moxie_reloc_val;
+};
+
+static const struct moxie_reloc_map moxie_reloc_map [] =
+{
+  { BFD_RELOC_NONE,           R_MOXIE_NONE },
+  { BFD_RELOC_32,             R_MOXIE_32 },
+};
+
+static reloc_howto_type *
+moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+			 bfd_reloc_code_real_type code)
+{
+  unsigned int i;
+
+  for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]);
+       --i;)
+    if (moxie_reloc_map [i].bfd_reloc_val == code)
+      return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val];
+
+  return NULL;
+}
+
+static reloc_howto_type *
+moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
+{
+  unsigned int i;
+
+  for (i = 0;
+       i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]);
+       i++)
+    if (moxie_elf_howto_table[i].name != NULL
+	&& strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0)
+      return &moxie_elf_howto_table[i];
+
+  return NULL;
+}
+
+/* Set the howto pointer for an MOXIE ELF reloc.  */
+
+static void
+moxie_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
+			  arelent *cache_ptr,
+			  Elf_Internal_Rela *dst)
+{
+  unsigned int r_type;
+
+  r_type = ELF32_R_TYPE (dst->r_info);
+  BFD_ASSERT (r_type < (unsigned int) R_MOXIE_max);
+  cache_ptr->howto = & moxie_elf_howto_table [r_type];
+}
+
+/* Perform a single relocation.  By default we use the standard BFD
+   routines, but a few relocs, we have to do them ourselves.  */
+
+static bfd_reloc_status_type
+moxie_final_link_relocate (reloc_howto_type *howto,
+			   bfd *input_bfd,
+			   asection *input_section,
+			   bfd_byte *contents,
+			   Elf_Internal_Rela *rel,
+			   bfd_vma relocation)
+{
+  bfd_reloc_status_type r = bfd_reloc_ok;
+
+  switch (howto->type)
+    {
+    default:
+      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+				    contents, rel->r_offset,
+				    relocation, rel->r_addend);
+    }
+
+  return r;
+}
+
+/* Relocate an MOXIE 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 relocatable
+   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 relocatable 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 bfd_boolean
+moxie_elf_relocate_section (bfd *output_bfd,
+			    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;
+
+  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
+  sym_hashes = elf_sym_hashes (input_bfd);
+  relend     = relocs + input_section->reloc_count;
+
+  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;
+      int r_type;
+
+      r_type = ELF32_R_TYPE (rel->r_info);
+
+      r_symndx = ELF32_R_SYM (rel->r_info);
+
+      howto  = moxie_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 = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
+
+	  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
+	{
+	  bfd_boolean unresolved_reloc, warned;
+
+	  RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
+				   r_symndx, symtab_hdr, sym_hashes,
+				   h, sec, relocation,
+				   unresolved_reloc, warned);
+
+	  name = h->root.root.string;
+	}
+
+      if (sec != NULL && elf_discarded_section (sec))
+	{
+	  /* For relocs against symbols from removed linkonce sections,
+	     or sections discarded by a linker script, we just want the
+	     section contents zeroed.  Avoid any special processing.  */
+	  _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
+	  rel->r_info = 0;
+	  rel->r_addend = 0;
+	  continue;
+	}
+
+      if (info->relocatable)
+	continue;
+
+      r = moxie_final_link_relocate (howto, input_bfd, input_section,
+				     contents, rel, relocation);
+
+      if (r != bfd_reloc_ok)
+	{
+	  const char * msg = NULL;
+
+	  switch (r)
+	    {
+	    case bfd_reloc_overflow:
+	      r = info->callbacks->reloc_overflow
+		(info, (h ? &h->root : NULL), 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;
+}
+
+/* Return the section that should be marked against GC for a given
+   relocation.  */
+
+static asection *
+moxie_elf_gc_mark_hook (asection *sec,
+			struct bfd_link_info *info,
+			Elf_Internal_Rela *rel,
+			struct elf_link_hash_entry *h,
+			Elf_Internal_Sym *sym)
+{
+  return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
+}
+
+/* Look through the relocs for a section during the first phase.
+   Since we don't do .gots or .plts, we just need to consider the
+   virtual table relocs for gc.  */
+
+static bfd_boolean
+moxie_elf_check_relocs (bfd *abfd,
+			struct bfd_link_info *info,
+			asection *sec,
+			const Elf_Internal_Rela *relocs)
+{
+  Elf_Internal_Shdr *symtab_hdr;
+  struct elf_link_hash_entry **sym_hashes;
+  const Elf_Internal_Rela *rel;
+  const Elf_Internal_Rela *rel_end;
+
+  if (info->relocatable)
+    return TRUE;
+
+  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+  sym_hashes = elf_sym_hashes (abfd);
+
+  rel_end = relocs + sec->reloc_count;
+  for (rel = relocs; rel < rel_end; rel++)
+    {
+      struct elf_link_hash_entry *h;
+      unsigned long r_symndx;
+
+      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;
+	}
+    }
+
+  return TRUE;
+}
+
+#define ELF_ARCH		bfd_arch_moxie
+#define ELF_MACHINE_CODE	EM_MOXIE
+#define ELF_MAXPAGESIZE		0x1
+
+#define TARGET_BIG_SYM          bfd_elf32_moxie_vec
+#define TARGET_BIG_NAME		"elf32-moxie"
+
+#define elf_info_to_howto_rel			NULL
+#define elf_info_to_howto			moxie_info_to_howto_rela
+#define elf_backend_relocate_section		moxie_elf_relocate_section
+#define elf_backend_gc_mark_hook		moxie_elf_gc_mark_hook
+#define elf_backend_check_relocs                moxie_elf_check_relocs
+
+#define elf_backend_can_gc_sections		1
+#define elf_backend_rela_normal			1
+
+#define bfd_elf32_bfd_reloc_type_lookup		moxie_reloc_type_lookup
+#define bfd_elf32_bfd_reloc_name_lookup		moxie_reloc_name_lookup
+
+#include "elf32-target.h"