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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:06 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:06 +0000
commit860acaebec6b57ce27e244cc02a58e6651a4b6c3 (patch)
treeeff5420756a4bd56b40b74c2b828b261f327610b /bfd/elf-m10300.c
parentf9c53ad2d7cb541cbe821d645b90437ac063e5db (diff)
downloadgdb-860acaebec6b57ce27e244cc02a58e6651a4b6c3.tar.gz
Initial revision
Diffstat (limited to 'bfd/elf-m10300.c')
-rw-r--r--bfd/elf-m10300.c2821
1 files changed, 2821 insertions, 0 deletions
diff --git a/bfd/elf-m10300.c b/bfd/elf-m10300.c
new file mode 100644
index 00000000000..9ba09a88d61
--- /dev/null
+++ b/bfd/elf-m10300.c
@@ -0,0 +1,2821 @@
+/* Matsushita 10300 specific support for 32-bit ELF
+ Copyright (C) 1996, 1997, 1998 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/mn10300.h"
+
+struct elf32_mn10300_link_hash_entry
+{
+ /* The basic elf link hash table entry. */
+ struct elf_link_hash_entry root;
+
+ /* For function symbols, the number of times this function is
+ called directly (ie by name). */
+ unsigned int direct_calls;
+
+ /* For function symbols, the size of this function's stack
+ (if <= 255 bytes). We stuff this into "call" instructions
+ to this target when it's valid and profitable to do so.
+
+ This does not include stack allocated by movm! */
+ unsigned char stack_size;
+
+ /* For function symbols, arguments (if any) for movm instruction
+ in the prologue. We stuff this value into "call" instructions
+ to the target when it's valid and profitable to do so. */
+ unsigned char movm_args;
+
+ /* For funtion symbols, the amount of stack space that would be allocated
+ by the movm instruction. This is redundant with movm_args, but we
+ add it to the hash table to avoid computing it over and over. */
+ unsigned char movm_stack_size;
+
+/* When set, convert all "call" instructions to this target into "calls"
+ instructions. */
+#define MN10300_CONVERT_CALL_TO_CALLS 0x1
+
+/* Used to mark functions which have had redundant parts of their
+ prologue deleted. */
+#define MN10300_DELETED_PROLOGUE_BYTES 0x2
+ unsigned char flags;
+};
+
+/* We derive a hash table from the main elf linker hash table so
+ we can store state variables and a secondary hash table without
+ resorting to global variables. */
+struct elf32_mn10300_link_hash_table
+{
+ /* The main hash table. */
+ struct elf_link_hash_table root;
+
+ /* A hash table for static functions. We could derive a new hash table
+ instead of using the full elf32_mn10300_link_hash_table if we wanted
+ to save some memory. */
+ struct elf32_mn10300_link_hash_table *static_hash_table;
+
+ /* Random linker state flags. */
+#define MN10300_HASH_ENTRIES_INITIALIZED 0x1
+ char flags;
+};
+
+/* For MN10300 linker hash table. */
+
+/* Get the MN10300 ELF linker hash table from a link_info structure. */
+
+#define elf32_mn10300_hash_table(p) \
+ ((struct elf32_mn10300_link_hash_table *) ((p)->hash))
+
+#define elf32_mn10300_link_hash_traverse(table, func, info) \
+ (elf_link_hash_traverse \
+ (&(table)->root, \
+ (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
+ (info)))
+
+static struct bfd_hash_entry *elf32_mn10300_link_hash_newfunc
+ PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
+static struct bfd_link_hash_table *elf32_mn10300_link_hash_table_create
+ PARAMS ((bfd *));
+
+static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
+ PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
+static void mn10300_info_to_howto
+ PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
+static boolean mn10300_elf_check_relocs
+ PARAMS ((bfd *, struct bfd_link_info *, asection *,
+ const Elf_Internal_Rela *));
+static asection *mn10300_elf_gc_mark_hook
+ PARAMS ((bfd *, struct bfd_link_info *info, Elf_Internal_Rela *,
+ struct elf_link_hash_entry *, Elf_Internal_Sym *));
+static boolean mn10300_elf_relax_delete_bytes
+ PARAMS ((bfd *, asection *, bfd_vma, int));
+static boolean mn10300_elf_symbol_address_p
+ PARAMS ((bfd *, asection *, Elf32_External_Sym *, bfd_vma));
+static boolean elf32_mn10300_finish_hash_table_entry
+ PARAMS ((struct bfd_hash_entry *, PTR));
+static void compute_function_info
+ PARAMS ((bfd *, struct elf32_mn10300_link_hash_entry *,
+ bfd_vma, unsigned char *));
+
+/* We have to use RELA instructions since md_apply_fix3 in the assembler
+ does absolutely nothing. */
+#define USE_RELA
+
+
+static reloc_howto_type elf_mn10300_howto_table[] =
+{
+ /* Dummy relocation. Does nothing. */
+ HOWTO (R_MN10300_NONE,
+ 0,
+ 2,
+ 16,
+ false,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_NONE",
+ false,
+ 0,
+ 0,
+ false),
+ /* Standard 32 bit reloc. */
+ HOWTO (R_MN10300_32,
+ 0,
+ 2,
+ 32,
+ false,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_32",
+ false,
+ 0xffffffff,
+ 0xffffffff,
+ false),
+ /* Standard 16 bit reloc. */
+ HOWTO (R_MN10300_16,
+ 0,
+ 1,
+ 16,
+ false,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_16",
+ false,
+ 0xffff,
+ 0xffff,
+ false),
+ /* Standard 8 bit reloc. */
+ HOWTO (R_MN10300_8,
+ 0,
+ 0,
+ 8,
+ false,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_8",
+ false,
+ 0xff,
+ 0xff,
+ false),
+ /* Standard 32bit pc-relative reloc. */
+ HOWTO (R_MN10300_PCREL32,
+ 0,
+ 2,
+ 32,
+ true,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_PCREL32",
+ false,
+ 0xffffffff,
+ 0xffffffff,
+ true),
+ /* Standard 16bit pc-relative reloc. */
+ HOWTO (R_MN10300_PCREL16,
+ 0,
+ 1,
+ 16,
+ true,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_PCREL16",
+ false,
+ 0xffff,
+ 0xffff,
+ true),
+ /* Standard 8 pc-relative reloc. */
+ HOWTO (R_MN10300_PCREL8,
+ 0,
+ 0,
+ 8,
+ true,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_PCREL8",
+ false,
+ 0xff,
+ 0xff,
+ true),
+
+ /* GNU extension to record C++ vtable hierarchy */
+ HOWTO (R_MN10300_GNU_VTINHERIT, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 0, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ NULL, /* special_function */
+ "R_MN10300_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_MN10300_GNU_VTENTRY, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 0, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ NULL, /* special_function */
+ "R_MN10300_GNU_VTENTRY", /* name */
+ false, /* partial_inplace */
+ 0, /* src_mask */
+ 0, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* Standard 24 bit reloc. */
+ HOWTO (R_MN10300_24,
+ 0,
+ 2,
+ 24,
+ false,
+ 0,
+ complain_overflow_bitfield,
+ bfd_elf_generic_reloc,
+ "R_MN10300_24",
+ false,
+ 0xffffff,
+ 0xffffff,
+ false),
+
+};
+
+struct mn10300_reloc_map
+{
+ bfd_reloc_code_real_type bfd_reloc_val;
+ unsigned char elf_reloc_val;
+};
+
+static const struct mn10300_reloc_map mn10300_reloc_map[] =
+{
+ { BFD_RELOC_NONE, R_MN10300_NONE, },
+ { BFD_RELOC_32, R_MN10300_32, },
+ { BFD_RELOC_16, R_MN10300_16, },
+ { BFD_RELOC_8, R_MN10300_8, },
+ { BFD_RELOC_32_PCREL, R_MN10300_PCREL32, },
+ { BFD_RELOC_16_PCREL, R_MN10300_PCREL16, },
+ { BFD_RELOC_8_PCREL, R_MN10300_PCREL8, },
+ { BFD_RELOC_24, R_MN10300_24, },
+ { BFD_RELOC_VTABLE_INHERIT, R_MN10300_GNU_VTINHERIT },
+ { BFD_RELOC_VTABLE_ENTRY, R_MN10300_GNU_VTENTRY },
+};
+
+static reloc_howto_type *
+bfd_elf32_bfd_reloc_type_lookup (abfd, code)
+ bfd *abfd;
+ bfd_reloc_code_real_type code;
+{
+ unsigned int i;
+
+ for (i = 0;
+ i < sizeof (mn10300_reloc_map) / sizeof (struct mn10300_reloc_map);
+ i++)
+ {
+ if (mn10300_reloc_map[i].bfd_reloc_val == code)
+ return &elf_mn10300_howto_table[mn10300_reloc_map[i].elf_reloc_val];
+ }
+
+ return NULL;
+}
+
+/* Set the howto pointer for an MN10300 ELF reloc. */
+
+static void
+mn10300_info_to_howto (abfd, cache_ptr, dst)
+ bfd *abfd;
+ arelent *cache_ptr;
+ Elf32_Internal_Rela *dst;
+{
+ unsigned int r_type;
+
+ r_type = ELF32_R_TYPE (dst->r_info);
+ BFD_ASSERT (r_type < (unsigned int) R_MN10300_MAX);
+ cache_ptr->howto = &elf_mn10300_howto_table[r_type];
+}
+
+/* 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 boolean
+mn10300_elf_check_relocs (abfd, info, sec, 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, **sym_hashes_end;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
+
+ if (info->relocateable)
+ return true;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
+ if (!elf_bad_symtab (abfd))
+ sym_hashes_end -= symtab_hdr->sh_info;
+
+ 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];
+
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ /* This relocation describes the C++ object vtable hierarchy.
+ Reconstruct it for later use during GC. */
+ case R_MN10300_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_MN10300_GNU_VTENTRY:
+ if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return false;
+ break;
+ }
+ }
+
+ return true;
+}
+
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
+static asection *
+mn10300_elf_gc_mark_hook (abfd, info, rel, h, sym)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ 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_MN10300_GNU_VTINHERIT:
+ case R_MN10300_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;
+ }
+ }
+ }
+ else
+ {
+ if (!(elf_bad_symtab (abfd)
+ && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
+ && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
+ && sym->st_shndx != SHN_COMMON))
+ {
+ return bfd_section_from_elf_index (abfd, sym->st_shndx);
+ }
+ }
+
+ return NULL;
+}
+
+/* Perform a relocation as part of a final link. */
+static bfd_reloc_status_type
+mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd,
+ input_section, contents, offset, value,
+ addend, info, sym_sec, is_local)
+ reloc_howto_type *howto;
+ bfd *input_bfd;
+ bfd *output_bfd;
+ asection *input_section;
+ bfd_byte *contents;
+ bfd_vma offset;
+ bfd_vma value;
+ bfd_vma addend;
+ struct bfd_link_info *info;
+ asection *sym_sec;
+ int is_local;
+{
+ unsigned long r_type = howto->type;
+ bfd_byte *hit_data = contents + offset;
+
+ switch (r_type)
+ {
+ case R_MN10300_NONE:
+ return bfd_reloc_ok;
+
+ case R_MN10300_32:
+ value += addend;
+ bfd_put_32 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_24:
+ value += addend;
+
+ if ((long)value > 0x7fffff || (long)value < -0x800000)
+ return bfd_reloc_overflow;
+
+ bfd_put_8 (input_bfd, value & 0xff, hit_data);
+ bfd_put_8 (input_bfd, (value >> 8) & 0xff, hit_data + 1);
+ bfd_put_8 (input_bfd, (value >> 16) & 0xff, hit_data + 2);
+ return bfd_reloc_ok;
+
+ case R_MN10300_16:
+ value += addend;
+
+ if ((long)value > 0x7fff || (long)value < -0x8000)
+ return bfd_reloc_overflow;
+
+ bfd_put_16 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_8:
+ value += addend;
+
+ if ((long)value > 0x7f || (long)value < -0x80)
+ return bfd_reloc_overflow;
+
+ bfd_put_8 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_PCREL8:
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= offset;
+ value += addend;
+
+ if ((long)value > 0xff || (long)value < -0x100)
+ return bfd_reloc_overflow;
+
+ bfd_put_8 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_PCREL16:
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= offset;
+ value += addend;
+
+ if ((long)value > 0xffff || (long)value < -0x10000)
+ return bfd_reloc_overflow;
+
+ bfd_put_16 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_PCREL32:
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= offset;
+ value += addend;
+
+ bfd_put_32 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_MN10300_GNU_VTINHERIT:
+ case R_MN10300_GNU_VTENTRY:
+ return bfd_reloc_ok;
+
+ default:
+ return bfd_reloc_notsupported;
+ }
+}
+
+
+/* Relocate an MN10300 ELF section. */
+static boolean
+mn10300_elf_relocate_section (output_bfd, info, input_bfd, input_section,
+ contents, relocs, local_syms, local_sections)
+ 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 elf32_mn10300_link_hash_entry **sym_hashes;
+ Elf_Internal_Rela *rel, *relend;
+
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = (struct elf32_mn10300_link_hash_entry **)
+ (elf_sym_hashes (input_bfd));
+
+ rel = relocs;
+ relend = relocs + input_section->reloc_count;
+ for (; rel < relend; rel++)
+ {
+ int r_type;
+ reloc_howto_type *howto;
+ unsigned long r_symndx;
+ Elf_Internal_Sym *sym;
+ asection *sec;
+ struct elf32_mn10300_link_hash_entry *h;
+ bfd_vma relocation;
+ bfd_reloc_status_type r;
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+ r_type = ELF32_R_TYPE (rel->r_info);
+ howto = elf_mn10300_howto_table + r_type;
+
+ /* Just skip the vtable gc relocs. */
+ if (r_type == R_MN10300_GNU_VTINHERIT
+ || r_type == R_MN10300_GNU_VTENTRY)
+ continue;
+
+ if (info->relocateable)
+ {
+ /* This is a relocateable link. We don't have to change
+ anything, unless the reloc is against a section symbol,
+ in which case we have to adjust according to where the
+ section symbol winds up in the output section. */
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+ if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
+ {
+ sec = local_sections[r_symndx];
+ rel->r_addend += sec->output_offset + sym->st_value;
+ }
+ }
+
+ continue;
+ }
+
+ /* This is a final link. */
+ 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);
+ }
+ 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 elf32_mn10300_link_hash_entry *) h->root.root.u.i.link;
+ if (h->root.root.type == bfd_link_hash_defined
+ || h->root.root.type == bfd_link_hash_defweak)
+ {
+ sec = h->root.root.u.def.section;
+ relocation = (h->root.root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if (h->root.root.type == bfd_link_hash_undefweak)
+ relocation = 0;
+ else
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.root.string, input_bfd,
+ input_section, rel->r_offset)))
+ return false;
+ relocation = 0;
+ }
+ }
+
+ r = mn10300_elf_final_link_relocate (howto, input_bfd, output_bfd,
+ input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend,
+ info, sec, h == NULL);
+
+ if (r != bfd_reloc_ok)
+ {
+ const char *name;
+ const char *msg = (const char *)0;
+
+ if (h != NULL)
+ name = h->root.root.root.string;
+ else
+ {
+ name = (bfd_elf_string_from_elf_section
+ (input_bfd, symtab_hdr->sh_link, sym->st_name));
+ if (name == NULL || *name == '\0')
+ name = bfd_section_name (input_bfd, sec);
+ }
+
+ switch (r)
+ {
+ case bfd_reloc_overflow:
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, name, howto->name, (bfd_vma) 0,
+ input_bfd, input_section, rel->r_offset)))
+ return false;
+ break;
+
+ case bfd_reloc_undefined:
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, name, input_bfd, input_section,
+ rel->r_offset)))
+ return false;
+ break;
+
+ case bfd_reloc_outofrange:
+ msg = _("internal error: out of range error");
+ goto common_error;
+
+ case bfd_reloc_notsupported:
+ msg = _("internal error: unsupported relocation error");
+ goto common_error;
+
+ case bfd_reloc_dangerous:
+ msg = _("internal error: dangerous error");
+ goto common_error;
+
+ default:
+ msg = _("internal error: unknown error");
+ /* fall through */
+
+ common_error:
+ if (!((*info->callbacks->warning)
+ (info, msg, name, input_bfd, input_section,
+ rel->r_offset)))
+ return false;
+ break;
+ }
+ }
+ }
+
+ return true;
+}
+
+/* Finish initializing one hash table entry. */
+static boolean
+elf32_mn10300_finish_hash_table_entry (gen_entry, in_args)
+ struct bfd_hash_entry *gen_entry;
+ PTR in_args;
+{
+ struct elf32_mn10300_link_hash_entry *entry;
+ unsigned int byte_count = 0;
+
+ entry = (struct elf32_mn10300_link_hash_entry *)gen_entry;
+
+ /* If we already know we want to convert "call" to "calls" for calls
+ to this symbol, then return now. */
+ if (entry->flags == MN10300_CONVERT_CALL_TO_CALLS)
+ return true;
+
+ /* If there are no named calls to this symbol, or there's nothing we
+ can move from the function itself into the "call" instruction, then
+ note that all "call" instructions should be converted into "calls"
+ instructions and return. */
+ if (entry->direct_calls == 0
+ || (entry->stack_size == 0 && entry->movm_args == 0))
+ {
+ /* Make a note that we should convert "call" instructions to "calls"
+ instructions for calls to this symbol. */
+ entry->flags |= MN10300_CONVERT_CALL_TO_CALLS;
+ return true;
+ }
+
+ /* We may be able to move some instructions from the function itself into
+ the "call" instruction. Count how many bytes we might be able to
+ eliminate in the function itself. */
+
+ /* A movm instruction is two bytes. */
+ if (entry->movm_args)
+ byte_count += 2;
+
+ /* Count the insn to allocate stack space too. */
+ if (entry->stack_size > 0 && entry->stack_size <= 128)
+ byte_count += 3;
+ else if (entry->stack_size > 0 && entry->stack_size < 256)
+ byte_count += 4;
+
+ /* If using "call" will result in larger code, then turn all
+ the associated "call" instructions into "calls" instrutions. */
+ if (byte_count < entry->direct_calls)
+ entry->flags |= MN10300_CONVERT_CALL_TO_CALLS;
+
+ /* This routine never fails. */
+ return true;
+}
+
+/* This function handles relaxing for the mn10300.
+
+ There's quite a few relaxing opportunites available on the mn10300:
+
+ * calls:32 -> calls:16 2 bytes
+ * call:32 -> call:16 2 bytes
+
+ * call:32 -> calls:32 1 byte
+ * call:16 -> calls:16 1 byte
+ * These are done anytime using "calls" would result
+ in smaller code, or when necessary to preserve the
+ meaning of the program.
+
+ * call:32 varies
+ * call:16
+ * In some circumstances we can move instructions
+ from a function prologue into a "call" instruction.
+ This is only done if the resulting code is no larger
+ than the original code.
+
+
+ * jmp:32 -> jmp:16 2 bytes
+ * jmp:16 -> bra:8 1 byte
+
+ * If the previous instruction is a conditional branch
+ around the jump/bra, we may be able to reverse its condition
+ and change its target to the jump's target. The jump/bra
+ can then be deleted. 2 bytes
+
+ * mov abs32 -> mov abs16 1 or 2 bytes
+
+ * Most instructions which accept imm32 can relax to imm16 1 or 2 bytes
+ - Most instructions which accept imm16 can relax to imm8 1 or 2 bytes
+
+ * Most instructions which accept d32 can relax to d16 1 or 2 bytes
+ - Most instructions which accept d16 can relax to d8 1 or 2 bytes
+
+ We don't handle imm16->imm8 or d16->d8 as they're very rare
+ and somewhat more difficult to support. */
+
+static boolean
+mn10300_elf_relax_section (abfd, sec, link_info, again)
+ bfd *abfd;
+ asection *sec;
+ struct bfd_link_info *link_info;
+ boolean *again;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Rela *internal_relocs = NULL;
+ Elf_Internal_Rela *free_relocs = NULL;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *contents = NULL;
+ bfd_byte *free_contents = NULL;
+ Elf32_External_Sym *extsyms = NULL;
+ Elf32_External_Sym *free_extsyms = NULL;
+ struct elf32_mn10300_link_hash_table *hash_table;
+
+ /* Assume nothing changes. */
+ *again = false;
+
+ /* We need a pointer to the mn10300 specific hash table. */
+ hash_table = elf32_mn10300_hash_table (link_info);
+
+ /* Initialize fields in each hash table entry the first time through. */
+ if ((hash_table->flags & MN10300_HASH_ENTRIES_INITIALIZED) == 0)
+ {
+ bfd *input_bfd;
+
+ /* Iterate over all the input bfds. */
+ for (input_bfd = link_info->input_bfds;
+ input_bfd != NULL;
+ input_bfd = input_bfd->link_next)
+ {
+ asection *section;
+
+ /* We're going to need all the symbols for each bfd. */
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+
+ /* Get cached copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ extsyms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_size));
+ if (extsyms == NULL)
+ goto error_return;
+ free_extsyms = extsyms;
+ if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (extsyms, 1, symtab_hdr->sh_size, input_bfd)
+ != symtab_hdr->sh_size))
+ goto error_return;
+ }
+
+ /* Iterate over each section in this bfd. */
+ for (section = input_bfd->sections;
+ section != NULL;
+ section = section->next)
+ {
+ struct elf32_mn10300_link_hash_entry *hash;
+ Elf_Internal_Sym *sym;
+ asection *sym_sec;
+ const char *sym_name;
+ char *new_name;
+ Elf_Internal_Shdr *hdr;
+
+ /* Get cached copy of section contents if it exists. */
+ if (elf_section_data (section)->this_hdr.contents != NULL)
+ contents = elf_section_data (section)->this_hdr.contents;
+ else if (section->_raw_size != 0)
+ {
+ /* Go get them off disk. */
+ contents = (bfd_byte *)bfd_malloc (section->_raw_size);
+ if (contents == NULL)
+ goto error_return;
+ free_contents = contents;
+
+ if (!bfd_get_section_contents (input_bfd, section,
+ contents, (file_ptr) 0,
+ section->_raw_size))
+ goto error_return;
+ }
+ else
+ {
+ contents = NULL;
+ free_contents = NULL;
+ }
+
+ /* If there aren't any relocs, then there's nothing to do. */
+ if ((section->flags & SEC_RELOC) != 0
+ && section->reloc_count != 0)
+ {
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (input_bfd, section, (PTR) NULL,
+ (Elf_Internal_Rela *) NULL,
+ link_info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! link_info->keep_memory)
+ free_relocs = internal_relocs;
+
+ /* Now examine each relocation. */
+ irel = internal_relocs;
+ irelend = irel + section->reloc_count;
+ for (; irel < irelend; irel++)
+ {
+ long r_type;
+ unsigned long r_index;
+ unsigned char code;
+
+ r_type = ELF32_R_TYPE (irel->r_info);
+ r_index = ELF32_R_SYM (irel->r_info);
+
+ if (r_type < 0 || r_type >= (int)R_MN10300_MAX)
+ goto error_return;
+
+ /* We need the name and hash table entry of the target
+ symbol! */
+ hash = NULL;
+ sym = NULL;
+ sym_sec = NULL;
+
+ if (r_index < symtab_hdr->sh_info)
+ {
+ /* A local symbol. */
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (input_bfd,
+ extsyms + r_index, &isym);
+
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx > 0
+ && isym.st_shndx < SHN_LORESERVE)
+ sym_sec
+ = bfd_section_from_elf_index (input_bfd,
+ isym.st_shndx);
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+
+ sym_name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ isym.st_name);
+
+ /* If it isn't a function, then we don't care
+ about it. */
+ if (r_index < symtab_hdr->sh_info
+ && ELF_ST_TYPE (isym.st_info) != STT_FUNC)
+ continue;
+
+ /* Tack on an ID so we can uniquely identify this
+ local symbol in the global hash table. */
+ new_name = bfd_malloc (strlen (sym_name) + 10);
+ if (new_name == 0)
+ goto error_return;
+
+ sprintf (new_name, "%s_%08x", sym_name, (int)sym_sec);
+ sym_name = new_name;
+
+ hash = (struct elf32_mn10300_link_hash_entry *)
+ elf_link_hash_lookup (&hash_table->static_hash_table->root,
+ sym_name, true,
+ true, false);
+ free (new_name);
+ }
+ else
+ {
+ r_index -= symtab_hdr->sh_info;
+ hash = (struct elf32_mn10300_link_hash_entry *)
+ elf_sym_hashes (input_bfd)[r_index];
+ }
+
+ /* If this is not a "call" instruction, then we
+ should convert "call" instructions to "calls"
+ instructions. */
+ code = bfd_get_8 (input_bfd,
+ contents + irel->r_offset - 1);
+ if (code != 0xdd && code != 0xcd)
+ hash->flags |= MN10300_CONVERT_CALL_TO_CALLS;
+
+ /* If this is a jump/call, then bump the direct_calls
+ counter. Else force "call" to "calls" conversions. */
+ if (r_type == R_MN10300_PCREL32
+ || r_type == R_MN10300_PCREL16)
+ hash->direct_calls++;
+ else
+ hash->flags |= MN10300_CONVERT_CALL_TO_CALLS;
+ }
+ }
+
+ /* Now look at the actual contents to get the stack size,
+ and a list of what registers were saved in the prologue
+ (ie movm_args). */
+ if ((section->flags & SEC_CODE) != 0)
+ {
+
+ Elf32_External_Sym *esym, *esymend;
+ int idx, shndx;
+
+ shndx = _bfd_elf_section_from_bfd_section (input_bfd,
+ section);
+
+
+ /* Look at each function defined in this section and
+ update info for that function. */
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++)
+ {
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (input_bfd, esym, &isym);
+ if (isym.st_shndx == shndx
+ && ELF_ST_TYPE (isym.st_info) == STT_FUNC)
+ {
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx > 0
+ && isym.st_shndx < SHN_LORESERVE)
+ sym_sec
+ = bfd_section_from_elf_index (input_bfd,
+ isym.st_shndx);
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+
+ sym_name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ isym.st_name);
+
+ /* Tack on an ID so we can uniquely identify this
+ local symbol in the global hash table. */
+ new_name = bfd_malloc (strlen (sym_name) + 10);
+ if (new_name == 0)
+ goto error_return;
+
+ sprintf (new_name, "%s_%08x", sym_name, (int)sym_sec);
+ sym_name = new_name;
+
+ hash = (struct elf32_mn10300_link_hash_entry *)
+ elf_link_hash_lookup (&hash_table->static_hash_table->root,
+ sym_name, true,
+ true, false);
+ free (new_name);
+ compute_function_info (input_bfd, hash,
+ isym.st_value, contents);
+ }
+ }
+
+ esym = extsyms + symtab_hdr->sh_info;
+ esymend = extsyms + (symtab_hdr->sh_size
+ / sizeof (Elf32_External_Sym));
+ for (idx = 0; esym < esymend; esym++, idx++)
+ {
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (input_bfd, esym, &isym);
+ hash = (struct elf32_mn10300_link_hash_entry *)
+ elf_sym_hashes (input_bfd)[idx];
+ if (isym.st_shndx == shndx
+ && ELF_ST_TYPE (isym.st_info) == STT_FUNC
+ && (hash)->root.root.u.def.section == section
+ && ((hash)->root.root.type == bfd_link_hash_defined
+ || (hash)->root.root.type == bfd_link_hash_defweak))
+ compute_function_info (input_bfd, hash,
+ (hash)->root.root.u.def.value,
+ contents);
+ }
+ }
+
+ /* Cache or free any memory we allocated for the relocs. */
+ if (free_relocs != NULL)
+ {
+ free (free_relocs);
+ free_relocs = NULL;
+ }
+
+ /* Cache or free any memory we allocated for the contents. */
+ if (free_contents != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (section)->this_hdr.contents = contents;
+ }
+ free_contents = NULL;
+ }
+ }
+
+ /* Cache or free any memory we allocated for the symbols. */
+ if (free_extsyms != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_extsyms);
+ else
+ {
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = extsyms;
+ }
+ free_extsyms = NULL;
+ }
+ }
+
+ /* Now iterate on each symbol in the hash table and perform
+ the final initialization steps on each. */
+ elf32_mn10300_link_hash_traverse (hash_table,
+ elf32_mn10300_finish_hash_table_entry,
+ NULL);
+ elf32_mn10300_link_hash_traverse (hash_table->static_hash_table,
+ elf32_mn10300_finish_hash_table_entry,
+ NULL);
+
+ /* All entries in the hash table are fully initialized. */
+ hash_table->flags |= MN10300_HASH_ENTRIES_INITIALIZED;
+
+ /* Now that everything has been initialized, go through each
+ code section and delete any prologue insns which will be
+ redundant because their operations will be performed by
+ a "call" instruction. */
+ for (input_bfd = link_info->input_bfds;
+ input_bfd != NULL;
+ input_bfd = input_bfd->link_next)
+ {
+ asection *section;
+
+ /* We're going to need all the symbols for each bfd. */
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+
+ /* Get cached copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ extsyms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_size));
+ if (extsyms == NULL)
+ goto error_return;
+ free_extsyms = extsyms;
+ if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (extsyms, 1, symtab_hdr->sh_size, input_bfd)
+ != symtab_hdr->sh_size))
+ goto error_return;
+ }
+
+ /* Walk over each section in this bfd. */
+ for (section = input_bfd->sections;
+ section != NULL;
+ section = section->next)
+ {
+ int shndx;
+ Elf32_External_Sym *esym, *esymend;
+ int idx;
+
+ /* Skip non-code sections and empty sections. */
+ if ((section->flags & SEC_CODE) == 0 || section->_raw_size == 0)
+ continue;
+
+ if (section->reloc_count != 0)
+ {
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (input_bfd, section, (PTR) NULL,
+ (Elf_Internal_Rela *) NULL,
+ link_info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! link_info->keep_memory)
+ free_relocs = internal_relocs;
+ }
+
+ /* Get cached copy of section contents if it exists. */
+ if (elf_section_data (section)->this_hdr.contents != NULL)
+ contents = elf_section_data (section)->this_hdr.contents;
+ else
+ {
+ /* Go get them off disk. */
+ contents = (bfd_byte *)bfd_malloc (section->_raw_size);
+ if (contents == NULL)
+ goto error_return;
+ free_contents = contents;
+
+ if (!bfd_get_section_contents (input_bfd, section,
+ contents, (file_ptr) 0,
+ section->_raw_size))
+ goto error_return;
+ }
+
+
+ shndx = _bfd_elf_section_from_bfd_section (input_bfd, section);
+
+ /* Now look for any function in this section which needs
+ insns deleted from its prologue. */
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++)
+ {
+ Elf_Internal_Sym isym;
+ struct elf32_mn10300_link_hash_entry *sym_hash;
+ asection *sym_sec;
+ const char *sym_name;
+ Elf_Internal_Shdr *hdr;
+ char *new_name;
+
+ bfd_elf32_swap_symbol_in (input_bfd, esym, &isym);
+
+ if (isym.st_shndx != shndx)
+ continue;
+
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx > 0 && isym.st_shndx < SHN_LORESERVE)
+ sym_sec
+ = bfd_section_from_elf_index (input_bfd, isym.st_shndx);
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+
+ sym_name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ isym.st_name);
+
+ /* Tack on an ID so we can uniquely identify this
+ local symbol in the global hash table. */
+ new_name = bfd_malloc (strlen (sym_name) + 10);
+ if (new_name == 0)
+ goto error_return;
+ sprintf (new_name, "%s_%08x", sym_name, (int)sym_sec);
+ sym_name = new_name;
+
+ sym_hash = (struct elf32_mn10300_link_hash_entry *)
+ elf_link_hash_lookup (&hash_table->static_hash_table->root,
+ sym_name, false,
+ false, false);
+
+ free (new_name);
+ if (sym_hash == NULL)
+ continue;
+
+ if (! ((sym_hash)->flags & MN10300_CONVERT_CALL_TO_CALLS)
+ && ! ((sym_hash)->flags & MN10300_DELETED_PROLOGUE_BYTES))
+ {
+ int bytes = 0;
+
+ /* Note that we've changed things. */
+ elf_section_data (section)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (section)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *)extsyms;
+ free_extsyms = NULL;
+
+ /* Count how many bytes we're going to delete. */
+ if (sym_hash->movm_args)
+ bytes += 2;
+
+ if (sym_hash->stack_size && sym_hash->stack_size <= 128)
+ bytes += 3;
+ else if (sym_hash->stack_size
+ && sym_hash->stack_size < 256)
+ bytes += 4;
+
+ /* Note that we've deleted prologue bytes for this
+ function. */
+ sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES;
+
+ /* Actually delete the bytes. */
+ if (!mn10300_elf_relax_delete_bytes (input_bfd,
+ section,
+ isym.st_value,
+ bytes))
+ goto error_return;
+
+ /* Something changed. Not strictly necessary, but
+ may lead to more relaxing opportunities. */
+ *again = true;
+ }
+ }
+
+ /* Look for any global functions in this section which
+ need insns deleted from their prologues. */
+ esym = extsyms + symtab_hdr->sh_info;
+ esymend = extsyms + (symtab_hdr->sh_size
+ / sizeof (Elf32_External_Sym));
+ for (idx = 0; esym < esymend; esym++, idx++)
+ {
+ Elf_Internal_Sym isym;
+ struct elf32_mn10300_link_hash_entry *sym_hash;
+
+ bfd_elf32_swap_symbol_in (input_bfd, esym, &isym);
+ sym_hash = (struct elf32_mn10300_link_hash_entry *)
+ (elf_sym_hashes (input_bfd)[idx]);
+ if (isym.st_shndx == shndx
+ && (sym_hash)->root.root.u.def.section == section
+ && ! ((sym_hash)->flags & MN10300_CONVERT_CALL_TO_CALLS)
+ && ! ((sym_hash)->flags & MN10300_DELETED_PROLOGUE_BYTES))
+ {
+ int bytes = 0;
+
+ /* Note that we've changed things. */
+ elf_section_data (section)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (section)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *)extsyms;
+ free_extsyms = NULL;
+
+ /* Count how many bytes we're going to delete. */
+ if (sym_hash->movm_args)
+ bytes += 2;
+
+ if (sym_hash->stack_size && sym_hash->stack_size <= 128)
+ bytes += 3;
+ else if (sym_hash->stack_size
+ && sym_hash->stack_size < 256)
+ bytes += 4;
+
+ /* Note that we've deleted prologue bytes for this
+ function. */
+ sym_hash->flags |= MN10300_DELETED_PROLOGUE_BYTES;
+
+ /* Actually delete the bytes. */
+ if (!mn10300_elf_relax_delete_bytes (input_bfd,
+ section,
+ (sym_hash)->root.root.u.def.value,
+ bytes))
+ goto error_return;
+
+ /* Something changed. Not strictly necessary, but
+ may lead to more relaxing opportunities. */
+ *again = true;
+ }
+ }
+
+ /* Cache or free any memory we allocated for the relocs. */
+ if (free_relocs != NULL)
+ {
+ free (free_relocs);
+ free_relocs = NULL;
+ }
+
+ /* Cache or free any memory we allocated for the contents. */
+ if (free_contents != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (section)->this_hdr.contents = contents;
+ }
+ free_contents = NULL;
+ }
+ }
+
+ /* Cache or free any memory we allocated for the symbols. */
+ if (free_extsyms != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_extsyms);
+ else
+ {
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = extsyms;
+ }
+ free_extsyms = NULL;
+ }
+ }
+ }
+
+
+ /* (Re)initialize for the basic instruction shortening/relaxing pass. */
+ contents = NULL;
+ extsyms = NULL;
+ internal_relocs = NULL;
+ free_relocs = NULL;
+ free_contents = NULL;
+ free_extsyms = NULL;
+
+ /* We don't have to do anything for a relocateable link, if
+ this section does not have relocs, or if this is not a
+ code section. */
+ if (link_info->relocateable
+ || (sec->flags & SEC_RELOC) == 0
+ || sec->reloc_count == 0
+ || (sec->flags & SEC_CODE) == 0)
+ return true;
+
+ /* If this is the first time we have been called for this section,
+ initialize the cooked size. */
+ if (sec->_cooked_size == 0)
+ sec->_cooked_size = sec->_raw_size;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
+ link_info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! link_info->keep_memory)
+ free_relocs = internal_relocs;
+
+ /* Walk through them looking for relaxing opportunities. */
+ irelend = internal_relocs + sec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ bfd_vma symval;
+ struct elf32_mn10300_link_hash_entry *h = NULL;
+
+ /* If this isn't something that can be relaxed, then ignore
+ this reloc. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_NONE
+ || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_8
+ || ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_MAX)
+ continue;
+
+ /* Get the section contents if we haven't done so already. */
+ if (contents == NULL)
+ {
+ /* Get cached copy if it exists. */
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ contents = elf_section_data (sec)->this_hdr.contents;
+ else
+ {
+ /* Go get them off disk. */
+ contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
+ if (contents == NULL)
+ goto error_return;
+ free_contents = contents;
+
+ if (! bfd_get_section_contents (abfd, sec, contents,
+ (file_ptr) 0, sec->_raw_size))
+ goto error_return;
+ }
+ }
+
+ /* Read this BFD's symbols if we haven't done so already. */
+ if (extsyms == NULL)
+ {
+ /* Get cached copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ extsyms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_size));
+ if (extsyms == NULL)
+ goto error_return;
+ free_extsyms = extsyms;
+ if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
+ != symtab_hdr->sh_size))
+ goto error_return;
+ }
+ }
+
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf_Internal_Sym isym;
+ asection *sym_sec;
+ Elf_Internal_Shdr *hdr;
+ const char *sym_name;
+ char *new_name;
+
+ /* A local symbol. */
+ bfd_elf32_swap_symbol_in (abfd,
+ extsyms + ELF32_R_SYM (irel->r_info),
+ &isym);
+
+ if (isym.st_shndx == SHN_UNDEF)
+ sym_sec = bfd_und_section_ptr;
+ else if (isym.st_shndx > 0 && isym.st_shndx < SHN_LORESERVE)
+ sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+ else if (isym.st_shndx == SHN_ABS)
+ sym_sec = bfd_abs_section_ptr;
+ else if (isym.st_shndx == SHN_COMMON)
+ sym_sec = bfd_com_section_ptr;
+
+ symval = (isym.st_value
+ + sym_sec->output_section->vma
+ + sym_sec->output_offset);
+ sym_name = bfd_elf_string_from_elf_section (abfd,
+ symtab_hdr->sh_link,
+ isym.st_name);
+
+ /* Tack on an ID so we can uniquely identify this
+ local symbol in the global hash table. */
+ new_name = bfd_malloc (strlen (sym_name) + 10);
+ if (new_name == 0)
+ goto error_return;
+ sprintf (new_name, "%s_%08x", sym_name, (int)sym_sec);
+ sym_name = new_name;
+
+ h = (struct elf32_mn10300_link_hash_entry *)
+ elf_link_hash_lookup (&hash_table->static_hash_table->root,
+ sym_name, false, false, false);
+ free (new_name);
+ }
+ else
+ {
+ unsigned long indx;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = (struct elf32_mn10300_link_hash_entry *)
+ (elf_sym_hashes (abfd)[indx]);
+ BFD_ASSERT (h != NULL);
+ if (h->root.root.type != bfd_link_hash_defined
+ && h->root.root.type != bfd_link_hash_defweak)
+ {
+ /* This appears to be a reference to an undefined
+ symbol. Just ignore it--it will be caught by the
+ regular reloc processing. */
+ continue;
+ }
+
+ symval = (h->root.root.u.def.value
+ + h->root.root.u.def.section->output_section->vma
+ + h->root.root.u.def.section->output_offset);
+ }
+
+ /* For simplicity of coding, we are going to modify the section
+ contents, the section relocs, and the BFD symbol table. We
+ must tell the rest of the code not to free up this
+ information. It would be possible to instead create a table
+ of changes which have to be made, as is done in coff-mips.c;
+ that would be more work, but would require less memory when
+ the linker is run. */
+
+ /* Try to turn a 32bit pc-relative branch/call into a 16bit pc-relative
+ branch/call, also deal with "call" -> "calls" conversions and
+ insertion of prologue data into "call" instructions. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL32)
+ {
+ bfd_vma value = symval;
+
+ /* If we've got a "call" instruction that needs to be turned
+ into a "calls" instruction, do so now. It saves a byte. */
+ if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS))
+ {
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ /* Make sure we're working with a "call" instruction! */
+ if (code == 0xdd)
+ {
+ /* Note that we've changed the relocs, section contents,
+ etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfc, contents + irel->r_offset - 1);
+ bfd_put_8 (abfd, 0xff, contents + irel->r_offset);
+
+ /* Fix irel->r_offset and irel->r_addend. */
+ irel->r_offset += 1;
+ irel->r_addend += 1;
+
+ /* Delete one byte of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 3, 1))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ }
+ else if (h)
+ {
+ /* We've got a "call" instruction which needs some data
+ from target function filled in. */
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ /* Insert data from the target function into the "call"
+ instruction if needed. */
+ if (code == 0xdd)
+ {
+ bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 4);
+ bfd_put_8 (abfd, h->stack_size + h->movm_stack_size,
+ contents + irel->r_offset + 5);
+ }
+ }
+
+ /* Deal with pc-relative gunk. */
+ value -= (sec->output_section->vma + sec->output_offset);
+ value -= irel->r_offset;
+ value += irel->r_addend;
+
+ /* See if the value will fit in 16 bits, note the high value is
+ 0x7fff + 2 as the target will be two bytes closer if we are
+ able to relax. */
+ if ((long)value < 0x8001 && (long)value > -0x8000)
+ {
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if (code != 0xdc && code != 0xdd && code != 0xff)
+ continue;
+
+ /* Note that we've changed the relocs, section contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ if (code == 0xdc)
+ bfd_put_8 (abfd, 0xcc, contents + irel->r_offset - 1);
+ else if (code == 0xdd)
+ bfd_put_8 (abfd, 0xcd, contents + irel->r_offset - 1);
+ else if (code == 0xff)
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_PCREL16);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ }
+
+ /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative
+ branch. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL16)
+ {
+ bfd_vma value = symval;
+
+ /* If we've got a "call" instruction that needs to be turned
+ into a "calls" instruction, do so now. It saves a byte. */
+ if (h && (h->flags & MN10300_CONVERT_CALL_TO_CALLS))
+ {
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ /* Make sure we're working with a "call" instruction! */
+ if (code == 0xcd)
+ {
+ /* Note that we've changed the relocs, section contents,
+ etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 1);
+ bfd_put_8 (abfd, 0xff, contents + irel->r_offset);
+
+ /* Fix irel->r_offset and irel->r_addend. */
+ irel->r_offset += 1;
+ irel->r_addend += 1;
+
+ /* Delete one byte of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 1))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ }
+ else if (h)
+ {
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ /* Insert data from the target function into the "call"
+ instruction if needed. */
+ if (code == 0xcd)
+ {
+ bfd_put_8 (abfd, h->movm_args, contents + irel->r_offset + 2);
+ bfd_put_8 (abfd, h->stack_size + h->movm_stack_size,
+ contents + irel->r_offset + 3);
+ }
+ }
+
+ /* Deal with pc-relative gunk. */
+ value -= (sec->output_section->vma + sec->output_offset);
+ value -= irel->r_offset;
+ value += irel->r_addend;
+
+ /* See if the value will fit in 8 bits, note the high value is
+ 0x7f + 1 as the target will be one bytes closer if we are
+ able to relax. */
+ if ((long)value < 0x80 && (long)value > -0x80)
+ {
+ unsigned char code;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if (code != 0xcc)
+ continue;
+
+ /* Note that we've changed the relocs, section contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xca, contents + irel->r_offset - 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_PCREL8);
+
+ /* Delete one byte of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 1))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ }
+
+ /* Try to eliminate an unconditional 8 bit pc-relative branch
+ which immediately follows a conditional 8 bit pc-relative
+ branch around the unconditional branch.
+
+ original: new:
+ bCC lab1 bCC' lab2
+ bra lab2
+ lab1: lab1:
+
+
+ This happens when the bCC can't reach lab2 at assembly time,
+ but due to other relaxations it can reach at link time. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_PCREL8)
+ {
+ Elf_Internal_Rela *nrel;
+ bfd_vma value = symval;
+ unsigned char code;
+
+ /* Deal with pc-relative gunk. */
+ value -= (sec->output_section->vma + sec->output_offset);
+ value -= irel->r_offset;
+ value += irel->r_addend;
+
+ /* Do nothing if this reloc is the last byte in the section. */
+ if (irel->r_offset == sec->_cooked_size)
+ continue;
+
+ /* See if the next instruction is an unconditional pc-relative
+ branch, more often than not this test will fail, so we
+ test it first to speed things up. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset + 1);
+ if (code != 0xca)
+ continue;
+
+ /* Also make sure the next relocation applies to the next
+ instruction and that it's a pc-relative 8 bit branch. */
+ nrel = irel + 1;
+ if (nrel == irelend
+ || irel->r_offset + 2 != nrel->r_offset
+ || ELF32_R_TYPE (nrel->r_info) != (int) R_MN10300_PCREL8)
+ continue;
+
+ /* Make sure our destination immediately follows the
+ unconditional branch. */
+ if (symval != (sec->output_section->vma + sec->output_offset
+ + irel->r_offset + 3))
+ continue;
+
+ /* Now make sure we are a conditional branch. This may not
+ be necessary, but why take the chance.
+
+ Note these checks assume that R_MN10300_PCREL8 relocs
+ only occur on bCC and bCCx insns. If they occured
+ elsewhere, we'd need to know the start of this insn
+ for this check to be accurate. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+ if (code != 0xc0 && code != 0xc1 && code != 0xc2
+ && code != 0xc3 && code != 0xc4 && code != 0xc5
+ && code != 0xc6 && code != 0xc7 && code != 0xc8
+ && code != 0xc9 && code != 0xe8 && code != 0xe9
+ && code != 0xea && code != 0xeb)
+ continue;
+
+ /* We also have to be sure there is no symbol/label
+ at the unconditional branch. */
+ if (mn10300_elf_symbol_address_p (abfd, sec, extsyms,
+ irel->r_offset + 1))
+ continue;
+
+ /* Note that we've changed the relocs, section contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Reverse the condition of the first branch. */
+ switch (code)
+ {
+ case 0xc8:
+ code = 0xc9;
+ break;
+ case 0xc9:
+ code = 0xc8;
+ break;
+ case 0xc0:
+ code = 0xc2;
+ break;
+ case 0xc2:
+ code = 0xc0;
+ break;
+ case 0xc3:
+ code = 0xc1;
+ break;
+ case 0xc1:
+ code = 0xc3;
+ break;
+ case 0xc4:
+ code = 0xc6;
+ break;
+ case 0xc6:
+ code = 0xc4;
+ break;
+ case 0xc7:
+ code = 0xc5;
+ break;
+ case 0xc5:
+ code = 0xc7;
+ break;
+ case 0xe8:
+ code = 0xe9;
+ break;
+ case 0x9d:
+ code = 0xe8;
+ break;
+ case 0xea:
+ code = 0xeb;
+ break;
+ case 0xeb:
+ code = 0xea;
+ break;
+ }
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
+
+ /* Set the reloc type and symbol for the first branch
+ from the second branch. */
+ irel->r_info = nrel->r_info;
+
+ /* Make the reloc for the second branch a null reloc. */
+ nrel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info),
+ R_MN10300_NONE);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+
+
+ /* Try to turn a 32bit immediate, displacement or absolute address
+ into a 16bit immediate, displacement or absolute address. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_MN10300_32)
+ {
+ bfd_vma value = symval;
+ value += irel->r_addend;
+
+
+ /* See if the value will fit in 16 bits.
+ We allow any 16bit match here. We prune those we can't
+ handle below. */
+ if ((long)value < 0x7fff && (long)value > -0x8000)
+ {
+ unsigned char code;
+
+ /* Most insns which have 32bit operands are 6 bytes long;
+ exceptions are pcrel insns and bit insns.
+
+ We handle pcrel insns above. We don't bother trying
+ to handle the bit insns here.
+
+ The first byte of the remaining insns will be 0xfc. */
+
+ /* Get the first opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
+
+ if (code != 0xfc)
+ continue;
+
+ /* Get the second opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if ((code & 0xf0) < 0x80)
+ switch (code & 0xf0)
+ {
+ /* mov (d32,am),dn -> mov (d32,am),dn
+ mov dm,(d32,am) -> mov dn,(d32,am)
+ mov (d32,am),an -> mov (d32,am),an
+ mov dm,(d32,am) -> mov dn,(d32,am)
+ movbu (d32,am),dn -> movbu (d32,am),dn
+ movbu dm,(d32,am) -> movbu dn,(d32,am)
+ movhu (d32,am),dn -> movhu (d32,am),dn
+ movhu dm,(d32,am) -> movhu dn,(d32,am) */
+ case 0x00:
+ case 0x10:
+ case 0x20:
+ case 0x30:
+ case 0x40:
+ case 0x50:
+ case 0x60:
+ case 0x70:
+ /* Not safe if the high bit is on as relaxing may
+ move the value out of high mem and thus not fit
+ in a signed 16bit value. */
+ if (code == 0xcc
+ && (value & 0x8000))
+ continue;
+
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 2, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+ }
+ else if ((code & 0xf0) == 0x80
+ || (code & 0xf0) == 0x90)
+ switch (code & 0xf3)
+ {
+ /* mov dn,(abs32) -> mov dn,(abs16)
+ movbu dn,(abs32) -> movbu dn,(abs16)
+ movhu dn,(abs32) -> movhu dn,(abs16) */
+ case 0x81:
+ case 0x82:
+ case 0x83:
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ if ((code & 0xf3) == 0x81)
+ code = 0x01 + (code & 0x0c);
+ else if ((code & 0xf3) == 0x82)
+ code = 0x02 + (code & 0x0c);
+ else if ((code & 0xf3) == 0x83)
+ code = 0x03 + (code & 0x0c);
+ else
+ abort ();
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* The opcode got shorter too, so we have to fix the
+ addend and offset too! */
+ irel->r_offset -= 1;
+
+ /* Delete three bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 3))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+
+ /* mov am,(abs32) -> mov am,(abs16)
+ mov am,(d32,sp) -> mov am,(d16,sp)
+ mov dm,(d32,sp) -> mov dm,(d32,sp)
+ movbu dm,(d32,sp) -> movbu dm,(d32,sp)
+ movhu dm,(d32,sp) -> movhu dm,(d32,sp) */
+ case 0x80:
+ case 0x90:
+ case 0x91:
+ case 0x92:
+ case 0x93:
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 2, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+ }
+ else if ((code & 0xf0) < 0xf0)
+ switch (code & 0xfc)
+ {
+ /* mov imm32,dn -> mov imm16,dn
+ mov imm32,an -> mov imm16,an
+ mov (abs32),dn -> mov (abs16),dn
+ movbu (abs32),dn -> movbu (abs16),dn
+ movhu (abs32),dn -> movhu (abs16),dn */
+ case 0xcc:
+ case 0xdc:
+ case 0xa4:
+ case 0xa8:
+ case 0xac:
+ /* Not safe if the high bit is on as relaxing may
+ move the value out of high mem and thus not fit
+ in a signed 16bit value. */
+ if (code == 0xcc
+ && (value & 0x8000))
+ continue;
+
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ if ((code & 0xfc) == 0xcc)
+ code = 0x2c + (code & 0x03);
+ else if ((code & 0xfc) == 0xdc)
+ code = 0x24 + (code & 0x03);
+ else if ((code & 0xfc) == 0xa4)
+ code = 0x30 + (code & 0x03);
+ else if ((code & 0xfc) == 0xa8)
+ code = 0x34 + (code & 0x03);
+ else if ((code & 0xfc) == 0xac)
+ code = 0x38 + (code & 0x03);
+ else
+ abort ();
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* The opcode got shorter too, so we have to fix the
+ addend and offset too! */
+ irel->r_offset -= 1;
+
+ /* Delete three bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 3))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+
+ /* mov (abs32),an -> mov (abs16),an
+ mov (d32,sp),an -> mov (d32,sp),an
+ mov (d32,sp),dn -> mov (d32,sp),dn
+ movbu (d32,sp),dn -> movbu (d32,sp),dn
+ movhu (d32,sp),dn -> movhu (d32,sp),dn
+ add imm32,dn -> add imm16,dn
+ cmp imm32,dn -> cmp imm16,dn
+ add imm32,an -> add imm16,an
+ cmp imm32,an -> cmp imm16,an
+ and imm32,dn -> and imm32,dn
+ or imm32,dn -> or imm32,dn
+ xor imm32,dn -> xor imm32,dn
+ btst imm32,dn -> btst imm32,dn */
+
+ case 0xa0:
+ case 0xb0:
+ case 0xb1:
+ case 0xb2:
+ case 0xb3:
+ case 0xc0:
+ case 0xc8:
+
+ case 0xd0:
+ case 0xd8:
+ case 0xe0:
+ case 0xe1:
+ case 0xe2:
+ case 0xe3:
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 2, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+ }
+ else if (code == 0xfe)
+ {
+ /* add imm32,sp -> add imm16,sp */
+
+ /* Note that we've changed the relocation contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ bfd_put_8 (abfd, 0xfa, contents + irel->r_offset - 2);
+ bfd_put_8 (abfd, 0xfe, contents + irel->r_offset - 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_MN10300_16);
+
+ /* Delete two bytes of data. */
+ if (!mn10300_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 2, 2))
+ goto error_return;
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ break;
+ }
+ }
+ }
+ }
+
+ if (free_relocs != NULL)
+ {
+ free (free_relocs);
+ free_relocs = NULL;
+ }
+
+ if (free_contents != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+ free_contents = NULL;
+ }
+
+ if (free_extsyms != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_extsyms);
+ else
+ {
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = extsyms;
+ }
+ free_extsyms = NULL;
+ }
+
+ return true;
+
+ error_return:
+ if (free_relocs != NULL)
+ free (free_relocs);
+ if (free_contents != NULL)
+ free (free_contents);
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ return false;
+}
+
+/* Compute the stack size and movm arguments for the function
+ referred to by HASH at address ADDR in section with
+ contents CONTENTS, store the information in the hash table. */
+static void
+compute_function_info (abfd, hash, addr, contents)
+ bfd *abfd;
+ struct elf32_mn10300_link_hash_entry *hash;
+ bfd_vma addr;
+ unsigned char *contents;
+{
+ unsigned char byte1, byte2;
+ /* We only care about a very small subset of the possible prologue
+ sequences here. Basically we look for:
+
+ movm [d2,d3,a2,a3],sp (optional)
+ add <size>,sp (optional, and only for sizes which fit in an unsigned
+ 8 bit number)
+
+ If we find anything else, we quit. */
+
+ /* Look for movm [regs],sp */
+ byte1 = bfd_get_8 (abfd, contents + addr);
+ byte2 = bfd_get_8 (abfd, contents + addr + 1);
+
+ if (byte1 == 0xcf)
+ {
+ hash->movm_args = byte2;
+ addr += 2;
+ byte1 = bfd_get_8 (abfd, contents + addr);
+ byte2 = bfd_get_8 (abfd, contents + addr + 1);
+ }
+
+ /* Now figure out how much stack space will be allocated by the movm
+ instruction. We need this kept separate from the funtion's normal
+ stack space. */
+ if (hash->movm_args)
+ {
+ /* Space for d2. */
+ if (hash->movm_args & 0x80)
+ hash->movm_stack_size += 4;
+
+ /* Space for d3. */
+ if (hash->movm_args & 0x40)
+ hash->movm_stack_size += 4;
+
+ /* Space for a2. */
+ if (hash->movm_args & 0x20)
+ hash->movm_stack_size += 4;
+
+ /* Space for a3. */
+ if (hash->movm_args & 0x10)
+ hash->movm_stack_size += 4;
+
+ /* "other" space. d0, d1, a0, a1, mdr, lir, lar, 4 byte pad. */
+ if (hash->movm_args & 0x08)
+ hash->movm_stack_size += 8 * 4;
+
+ }
+
+ /* Now look for the two stack adjustment variants. */
+ if (byte1 == 0xf8 && byte2 == 0xfe)
+ {
+ int temp = bfd_get_8 (abfd, contents + addr + 2);
+ temp = ((temp & 0xff) ^ (~0x7f)) + 0x80;
+
+ hash->stack_size = -temp;
+ }
+ else if (byte1 == 0xfa && byte2 == 0xfe)
+ {
+ int temp = bfd_get_16 (abfd, contents + addr + 2);
+ temp = ((temp & 0xffff) ^ (~0x7fff)) + 0x8000;
+ temp = -temp;
+
+ if (temp < 255)
+ hash->stack_size = temp;
+ }
+
+ /* If the total stack to be allocated by the call instruction is more
+ than 255 bytes, then we can't remove the stack adjustment by using
+ "call" (we might still be able to remove the "movm" instruction. */
+ if (hash->stack_size + hash->movm_stack_size > 255)
+ hash->stack_size = 0;
+
+ return;
+}
+
+/* Delete some bytes from a section while relaxing. */
+
+static boolean
+mn10300_elf_relax_delete_bytes (abfd, sec, addr, count)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ int count;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf32_External_Sym *extsyms;
+ int shndx, index;
+ bfd_byte *contents;
+ Elf_Internal_Rela *irel, *irelend;
+ Elf_Internal_Rela *irelalign;
+ bfd_vma toaddr;
+ Elf32_External_Sym *esym, *esymend;
+ struct elf32_mn10300_link_hash_entry *sym_hash;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+
+ shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+ contents = elf_section_data (sec)->this_hdr.contents;
+
+ /* The deletion must stop at the next ALIGN reloc for an aligment
+ power larger than the number of bytes we are deleting. */
+
+ irelalign = NULL;
+ toaddr = sec->_cooked_size;
+
+ irel = elf_section_data (sec)->relocs;
+ irelend = irel + sec->reloc_count;
+
+ /* Actually delete the bytes. */
+ memmove (contents + addr, contents + addr + count, toaddr - addr - count);
+ sec->_cooked_size -= count;
+
+ /* Adjust all the relocs. */
+ for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
+ {
+ /* Get the new reloc address. */
+ if ((irel->r_offset > addr
+ && irel->r_offset < toaddr))
+ irel->r_offset -= count;
+ }
+
+ /* Adjust the local symbols defined in this section. */
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++)
+ {
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, &isym);
+
+ if (isym.st_shndx == shndx
+ && isym.st_value > addr
+ && isym.st_value < toaddr)
+ {
+ isym.st_value -= count;
+ bfd_elf32_swap_symbol_out (abfd, &isym, esym);
+ }
+ }
+
+ /* Now adjust the global symbols defined in this section. */
+ esym = extsyms + symtab_hdr->sh_info;
+ esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym));
+ for (index = 0; esym < esymend; esym++, index++)
+ {
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, &isym);
+ sym_hash = (struct elf32_mn10300_link_hash_entry *)
+ (elf_sym_hashes (abfd)[index]);
+ if (isym.st_shndx == shndx
+ && ((sym_hash)->root.root.type == bfd_link_hash_defined
+ || (sym_hash)->root.root.type == bfd_link_hash_defweak)
+ && (sym_hash)->root.root.u.def.section == sec
+ && (sym_hash)->root.root.u.def.value > addr
+ && (sym_hash)->root.root.u.def.value < toaddr)
+ {
+ (sym_hash)->root.root.u.def.value -= count;
+ }
+ }
+
+ return true;
+}
+
+/* Return true if a symbol exists at the given address, else return
+ false. */
+static boolean
+mn10300_elf_symbol_address_p (abfd, sec, extsyms, addr)
+ bfd *abfd;
+ asection *sec;
+ Elf32_External_Sym *extsyms;
+ bfd_vma addr;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ int shndx;
+ Elf32_External_Sym *esym, *esymend;
+ struct elf32_mn10300_link_hash_entry **sym_hash, **sym_hash_end;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+ /* Examine all the symbols. */
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++)
+ {
+ Elf_Internal_Sym isym;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, &isym);
+
+ if (isym.st_shndx == shndx
+ && isym.st_value == addr)
+ return true;
+ }
+
+ sym_hash = (struct elf32_mn10300_link_hash_entry **)(elf_sym_hashes (abfd));
+ sym_hash_end = (sym_hash
+ + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
+ - symtab_hdr->sh_info));
+ for (; sym_hash < sym_hash_end; sym_hash++)
+ {
+ if (((*sym_hash)->root.root.type == bfd_link_hash_defined
+ || (*sym_hash)->root.root.type == bfd_link_hash_defweak)
+ && (*sym_hash)->root.root.u.def.section == sec
+ && (*sym_hash)->root.root.u.def.value == addr)
+ return true;
+ }
+ return false;
+}
+
+/* This is a version of bfd_generic_get_relocated_section_contents
+ which uses mn10300_elf_relocate_section. */
+
+static bfd_byte *
+mn10300_elf_get_relocated_section_contents (output_bfd, link_info, link_order,
+ data, relocateable, symbols)
+ bfd *output_bfd;
+ struct bfd_link_info *link_info;
+ struct bfd_link_order *link_order;
+ bfd_byte *data;
+ boolean relocateable;
+ asymbol **symbols;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ asection *input_section = link_order->u.indirect.section;
+ bfd *input_bfd = input_section->owner;
+ asection **sections = NULL;
+ Elf_Internal_Rela *internal_relocs = NULL;
+ Elf32_External_Sym *external_syms = NULL;
+ Elf_Internal_Sym *internal_syms = NULL;
+
+ /* We only need to handle the case of relaxing, or of having a
+ particular set of section contents, specially. */
+ if (relocateable
+ || elf_section_data (input_section)->this_hdr.contents == NULL)
+ return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
+ link_order, data,
+ relocateable,
+ symbols);
+
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+
+ memcpy (data, elf_section_data (input_section)->this_hdr.contents,
+ input_section->_raw_size);
+
+ if ((input_section->flags & SEC_RELOC) != 0
+ && input_section->reloc_count > 0)
+ {
+ Elf_Internal_Sym *isymp;
+ asection **secpp;
+ Elf32_External_Sym *esym, *esymend;
+
+ if (symtab_hdr->contents != NULL)
+ external_syms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ external_syms = ((Elf32_External_Sym *)
+ bfd_malloc (symtab_hdr->sh_info
+ * sizeof (Elf32_External_Sym)));
+ if (external_syms == NULL && symtab_hdr->sh_info > 0)
+ goto error_return;
+ if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || (bfd_read (external_syms, sizeof (Elf32_External_Sym),
+ symtab_hdr->sh_info, input_bfd)
+ != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym))))
+ goto error_return;
+ }
+
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (input_bfd, input_section, (PTR) NULL,
+ (Elf_Internal_Rela *) NULL, false));
+ if (internal_relocs == NULL)
+ goto error_return;
+
+ internal_syms = ((Elf_Internal_Sym *)
+ bfd_malloc (symtab_hdr->sh_info
+ * sizeof (Elf_Internal_Sym)));
+ if (internal_syms == NULL && symtab_hdr->sh_info > 0)
+ goto error_return;
+
+ sections = (asection **) bfd_malloc (symtab_hdr->sh_info
+ * sizeof (asection *));
+ if (sections == NULL && symtab_hdr->sh_info > 0)
+ goto error_return;
+
+ isymp = internal_syms;
+ secpp = sections;
+ esym = external_syms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; ++esym, ++isymp, ++secpp)
+ {
+ asection *isec;
+
+ bfd_elf32_swap_symbol_in (input_bfd, esym, isymp);
+
+ if (isymp->st_shndx == SHN_UNDEF)
+ isec = bfd_und_section_ptr;
+ else if (isymp->st_shndx > 0 && isymp->st_shndx < SHN_LORESERVE)
+ isec = bfd_section_from_elf_index (input_bfd, isymp->st_shndx);
+ else if (isymp->st_shndx == SHN_ABS)
+ isec = bfd_abs_section_ptr;
+ else if (isymp->st_shndx == SHN_COMMON)
+ isec = bfd_com_section_ptr;
+ else
+ {
+ /* Who knows? */
+ isec = NULL;
+ }
+
+ *secpp = isec;
+ }
+
+ if (! mn10300_elf_relocate_section (output_bfd, link_info, input_bfd,
+ input_section, data, internal_relocs,
+ internal_syms, sections))
+ goto error_return;
+
+ if (sections != NULL)
+ free (sections);
+ sections = NULL;
+ if (internal_syms != NULL)
+ free (internal_syms);
+ internal_syms = NULL;
+ if (external_syms != NULL && symtab_hdr->contents == NULL)
+ free (external_syms);
+ external_syms = NULL;
+ if (internal_relocs != elf_section_data (input_section)->relocs)
+ free (internal_relocs);
+ internal_relocs = NULL;
+ }
+
+ return data;
+
+ error_return:
+ if (internal_relocs != NULL
+ && internal_relocs != elf_section_data (input_section)->relocs)
+ free (internal_relocs);
+ if (external_syms != NULL && symtab_hdr->contents == NULL)
+ free (external_syms);
+ if (internal_syms != NULL)
+ free (internal_syms);
+ if (sections != NULL)
+ free (sections);
+ return NULL;
+}
+
+/* Assorted hash table functions. */
+
+/* Initialize an entry in the link hash table. */
+
+/* Create an entry in an MN10300 ELF linker hash table. */
+
+static struct bfd_hash_entry *
+elf32_mn10300_link_hash_newfunc (entry, table, string)
+ struct bfd_hash_entry *entry;
+ struct bfd_hash_table *table;
+ const char *string;
+{
+ struct elf32_mn10300_link_hash_entry *ret =
+ (struct elf32_mn10300_link_hash_entry *) entry;
+
+ /* Allocate the structure if it has not already been allocated by a
+ subclass. */
+ if (ret == (struct elf32_mn10300_link_hash_entry *) NULL)
+ ret = ((struct elf32_mn10300_link_hash_entry *)
+ bfd_hash_allocate (table,
+ sizeof (struct elf32_mn10300_link_hash_entry)));
+ if (ret == (struct elf32_mn10300_link_hash_entry *) NULL)
+ return (struct bfd_hash_entry *) ret;
+
+ /* Call the allocation method of the superclass. */
+ ret = ((struct elf32_mn10300_link_hash_entry *)
+ _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
+ table, string));
+ if (ret != (struct elf32_mn10300_link_hash_entry *) NULL)
+ {
+ ret->direct_calls = 0;
+ ret->stack_size = 0;
+ ret->movm_stack_size = 0;
+ ret->flags = 0;
+ ret->movm_args = 0;
+ }
+
+ return (struct bfd_hash_entry *) ret;
+}
+
+/* Create an mn10300 ELF linker hash table. */
+
+static struct bfd_link_hash_table *
+elf32_mn10300_link_hash_table_create (abfd)
+ bfd *abfd;
+{
+ struct elf32_mn10300_link_hash_table *ret;
+
+ ret = ((struct elf32_mn10300_link_hash_table *)
+ bfd_alloc (abfd, sizeof (struct elf32_mn10300_link_hash_table)));
+ if (ret == (struct elf32_mn10300_link_hash_table *) NULL)
+ return NULL;
+
+ if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
+ elf32_mn10300_link_hash_newfunc))
+ {
+ bfd_release (abfd, ret);
+ return NULL;
+ }
+
+ ret->flags = 0;
+ ret->static_hash_table
+ = ((struct elf32_mn10300_link_hash_table *)
+ bfd_alloc (abfd, sizeof (struct elf_link_hash_table)));
+ if (ret->static_hash_table == NULL)
+ {
+ bfd_release (abfd, ret);
+ return NULL;
+ }
+
+ if (! _bfd_elf_link_hash_table_init (&ret->static_hash_table->root, abfd,
+ elf32_mn10300_link_hash_newfunc))
+ {
+ bfd_release (abfd, ret->static_hash_table);
+ bfd_release (abfd, ret);
+ return NULL;
+ }
+ return &ret->root.root;
+}
+
+static int
+elf_mn10300_mach (flags)
+ flagword flags;
+{
+ switch (flags & EF_MN10300_MACH)
+ {
+ case E_MN10300_MACH_MN10300:
+ default:
+ return bfd_mach_mn10300;
+
+ }
+}
+
+/* The final processing done just before writing out a MN10300 ELF object
+ file. This gets the MN10300 architecture right based on the machine
+ number. */
+
+/*ARGSUSED*/
+void
+_bfd_mn10300_elf_final_write_processing (abfd, linker)
+ bfd *abfd;
+ boolean linker;
+{
+ unsigned long val;
+ unsigned int i;
+ Elf_Internal_Shdr **hdrpp;
+ const char *name;
+ asection *sec;
+
+ switch (bfd_get_mach (abfd))
+ {
+ default:
+ case bfd_mach_mn10300:
+ val = E_MN10300_MACH_MN10300;
+ break;
+
+ }
+
+ elf_elfheader (abfd)->e_flags &= ~ (EF_MN10300_MACH);
+ elf_elfheader (abfd)->e_flags |= val;
+}
+
+boolean
+_bfd_mn10300_elf_object_p (abfd)
+ bfd *abfd;
+{
+ bfd_default_set_arch_mach (abfd, bfd_arch_mn10300,
+ elf_mn10300_mach (elf_elfheader (abfd)->e_flags));
+ return true;
+}
+
+/* Merge backend specific data from an object file to the output
+ object file when linking. */
+
+boolean
+_bfd_mn10300_elf_merge_private_bfd_data (ibfd, obfd)
+ bfd *ibfd;
+ bfd *obfd;
+{
+ if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
+ || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
+ return true;
+
+ if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
+ && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
+ {
+ if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
+ bfd_get_mach (ibfd)))
+ return false;
+ }
+
+ return true;
+}
+
+
+#define TARGET_LITTLE_SYM bfd_elf32_mn10300_vec
+#define TARGET_LITTLE_NAME "elf32-mn10300"
+#define ELF_ARCH bfd_arch_mn10300
+#define ELF_MACHINE_CODE EM_CYGNUS_MN10300
+#define ELF_MAXPAGESIZE 0x1000
+
+#define elf_info_to_howto mn10300_info_to_howto
+#define elf_info_to_howto_rel 0
+#define elf_backend_can_gc_sections 1
+#define elf_backend_check_relocs mn10300_elf_check_relocs
+#define elf_backend_gc_mark_hook mn10300_elf_gc_mark_hook
+#define elf_backend_relocate_section mn10300_elf_relocate_section
+#define bfd_elf32_bfd_relax_section mn10300_elf_relax_section
+#define bfd_elf32_bfd_get_relocated_section_contents \
+ mn10300_elf_get_relocated_section_contents
+#define bfd_elf32_bfd_link_hash_table_create \
+ elf32_mn10300_link_hash_table_create
+
+#define elf_symbol_leading_char '_'
+
+/* So we can set bits in e_flags. */
+#define elf_backend_final_write_processing \
+ _bfd_mn10300_elf_final_write_processing
+#define elf_backend_object_p _bfd_mn10300_elf_object_p
+
+#define bfd_elf32_bfd_merge_private_bfd_data \
+ _bfd_mn10300_elf_merge_private_bfd_data
+
+
+#include "elf32-target.h"