/* Generic support for 32-bit ELF
- Copyright 1993, 1995, 1998, 1999 Free Software Foundation, Inc.
+ Copyright 1993, 1995, 1998, 1999, 2001 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void elf32_h8_info_to_howto
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
+static void elf32_h8_info_to_howto_rel
+ PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
+static unsigned long elf32_h8_mach
+ PARAMS ((flagword));
+static void elf32_h8_final_write_processing
+ PARAMS ((bfd *, boolean));
+static boolean elf32_h8_object_p
+ PARAMS ((bfd *));
+static boolean elf32_h8_merge_private_bfd_data
+ PARAMS ((bfd *, bfd *));
+static boolean elf32_h8_relax_section
+ PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
+static boolean elf32_h8_relax_delete_bytes
+ PARAMS ((bfd *, asection *, bfd_vma, int));
+static boolean elf32_h8_symbol_address_p
+ PARAMS ((bfd *, asection *, Elf32_External_Sym *, bfd_vma));
+static bfd_byte *elf32_h8_get_relocated_section_contents
+ PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *,
+ bfd_byte *, boolean, asymbol **));
+static bfd_reloc_status_type elf32_h8_final_link_relocate
+ PARAMS ((unsigned long, bfd *, bfd *, asection *,
+ bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
+ struct bfd_link_info *, asection *, int));
+static boolean elf32_h8_relocate_section
+ PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
+ bfd_byte *, Elf_Internal_Rela *,
+ Elf_Internal_Sym *, asection **));
+static bfd_reloc_status_type special
+ PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
/* This does not include any relocation information, but should be
good enough for GDB or objdump to read the file. */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR16A8", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR16R8", /* name */
false, /* partial_inplace */
0, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR24A8", /* name */
true, /* partial_inplace */
0xff000000, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR24R8", /* name */
true, /* partial_inplace */
0xff000000, /* src_mask */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- NULL, /* special_function */
+ special, /* special_function */
"R_H8_DIR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
+#define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1)
+ HOWTO (R_H8_PCREL16, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ true, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ special, /* special_function */
+ "R_H8_PCREL16", /* name */
+ false, /* partial_inplace */
+ 0xffff, /* src_mask */
+ 0xffff, /* dst_mask */
+ true), /* pcrel_offset */
+#define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
+ HOWTO (R_H8_PCREL8, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 8, /* bitsize */
+ true, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_signed, /* complain_on_overflow */
+ special, /* special_function */
+ "R_H8_PCREL8", /* name */
+ false, /* partial_inplace */
+ 0xff, /* src_mask */
+ 0xff, /* dst_mask */
+ true), /* pcrel_offset */
};
/* This structure is used to map BFD reloc codes to H8 ELF relocs. */
{ BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
{ BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
{ BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
+ { BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
+ { BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
};
+
static reloc_howto_type *
elf32_h8_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
elf32_h8_info_to_howto (abfd, bfd_reloc, elf_reloc)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *bfd_reloc;
- Elf32_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED;
+ Elf32_Internal_Rela *elf_reloc;
{
unsigned int r;
unsigned int i;
bfd_reloc->howto = &h8_elf_howto_table[r];
}
+/* Special handling for H8/300 relocs.
+ We only come here for pcrel stuff and return normally if not an -r link.
+ When doing -r, we can't do any arithmetic for the pcrel stuff, because
+ we support relaxing on the H8/300 series chips. */
+static bfd_reloc_status_type
+special (abfd, reloc_entry, symbol, data, input_section, output_bfd,
+ error_message)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ arelent *reloc_entry ATTRIBUTE_UNUSED;
+ asymbol *symbol ATTRIBUTE_UNUSED;
+ PTR data ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd *output_bfd;
+ char **error_message ATTRIBUTE_UNUSED;
+{
+ if (output_bfd == (bfd *) NULL)
+ return bfd_reloc_continue;
+
+ /* Adjust the reloc address to that in the output section. */
+ reloc_entry->address += input_section->output_offset;
+ return bfd_reloc_ok;
+}
+
+/* Perform a relocation as part of a final link. */
+static bfd_reloc_status_type
+elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
+ input_section, contents, offset, value,
+ addend, info, sym_sec, is_local)
+ unsigned long r_type;
+ bfd *input_bfd;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ asection *input_section ATTRIBUTE_UNUSED;
+ bfd_byte *contents;
+ bfd_vma offset;
+ bfd_vma value;
+ bfd_vma addend;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ asection *sym_sec ATTRIBUTE_UNUSED;
+ int is_local ATTRIBUTE_UNUSED;
+{
+ bfd_byte *hit_data = contents + offset;
+
+ switch (r_type)
+ {
+
+ case R_H8_NONE:
+ return bfd_reloc_ok;
+
+ case R_H8_DIR32:
+ case R_H8_DIR32A16:
+ case R_H8_DIR24A8:
+ value += addend;
+ bfd_put_32 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_H8_DIR16:
+ case R_H8_DIR16A8:
+ case R_H8_DIR16R8:
+ value += addend;
+ bfd_put_16 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ /* AKA R_RELBYTE */
+ case R_H8_DIR8:
+ value += addend;
+
+ bfd_put_8 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_H8_DIR24R8:
+ value += addend;
+
+ /* HIT_DATA is the address for the first byte for the relocated
+ value. Subtract 1 so that we can manipulate the data in 32bit
+ hunks. */
+ hit_data--;
+
+ /* Clear out the top byte in value. */
+ value &= 0xffffff;
+
+ /* Retrieve the type byte for value from the section contents. */
+ value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
+
+ /* Now scribble it out in one 32bit hunk. */
+ bfd_put_32 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_H8_PCREL16:
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= offset;
+ value += addend;
+
+ /* The value is relative to the start of the instruction,
+ not the relocation offset. Subtract 2 to account for
+ this minor issue. */
+ value -= 2;
+
+ bfd_put_16 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ case R_H8_PCREL8:
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= offset;
+ value += addend;
+
+ /* The value is relative to the start of the instruction,
+ not the relocation offset. Subtract 1 to account for
+ this minor issue. */
+ value -= 1;
+
+ bfd_put_8 (input_bfd, value, hit_data);
+ return bfd_reloc_ok;
+
+ default:
+ return bfd_reloc_notsupported;
+ }
+}
+\f
+/* Relocate an H8 ELF section. */
+static boolean
+elf32_h8_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 elf_link_hash_entry **sym_hashes;
+ Elf_Internal_Rela *rel, *relend;
+
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (input_bfd);
+
+ rel = relocs;
+ relend = relocs + input_section->reloc_count;
+ for (; rel < relend; rel++)
+ {
+ unsigned int r_type;
+ unsigned long r_symndx;
+ Elf_Internal_Sym *sym;
+ asection *sec;
+ struct elf_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);
+
+ 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 = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel);
+ }
+ 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;
+ 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;
+ }
+ }
+
+ r = elf32_h8_final_link_relocate (r_type, 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;
+ arelent bfd_reloc;
+ reloc_howto_type *howto;
+
+ elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
+ howto = bfd_reloc.howto;
+
+ if (h != NULL)
+ name = h->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, true)))
+ 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;
+}
+
+/* Object files encode the specific H8 model they were compiled
+ for in the ELF flags field.
+
+ Examine that field and return the proper BFD machine type for
+ the object file. */
+static unsigned long
+elf32_h8_mach (flags)
+ flagword flags;
+{
+ switch (flags & EF_H8_MACH)
+ {
+ case E_H8_MACH_H8300:
+ default:
+ return bfd_mach_h8300;
+
+ case E_H8_MACH_H8300H:
+ return bfd_mach_h8300h;
+
+ case E_H8_MACH_H8300S:
+ return bfd_mach_h8300s;
+ }
+}
+
+/* The final processing done just before writing out a H8 ELF object
+ file. We use this opportunity to encode the BFD machine type
+ into the flags field in the object file. */
+
+static void
+elf32_h8_final_write_processing (abfd, linker)
+ bfd *abfd;
+ boolean linker ATTRIBUTE_UNUSED;
+{
+ unsigned long val;
+
+ switch (bfd_get_mach (abfd))
+ {
+ default:
+ case bfd_mach_h8300:
+ val = E_H8_MACH_H8300;
+ break;
+
+ case bfd_mach_h8300h:
+ val = E_H8_MACH_H8300H;
+ break;
+
+ case bfd_mach_h8300s:
+ val = E_H8_MACH_H8300S;
+ break;
+ }
+
+ elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
+ elf_elfheader (abfd)->e_flags |= val;
+}
+
+/* Return nonzero if ABFD represents a valid H8 ELF object file; also
+ record the encoded machine type found in the ELF flags. */
+
+static boolean
+elf32_h8_object_p (abfd)
+ bfd *abfd;
+{
+ bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
+ elf32_h8_mach (elf_elfheader (abfd)->e_flags));
+ return true;
+}
+
+/* Merge backend specific data from an object file to the output
+ object file when linking. The only data we need to copy at this
+ time is the architecture/machine information. */
+
+static boolean
+elf32_h8_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;
+}
+
+/* This function handles relaxing for the H8..
+
+ There's a few relaxing opportunites available on the H8:
+
+ jmp/jsr:24 -> bra/bsr:8 2 bytes
+ The jmp may be completely eliminated if the previous insn is a
+ conditional branch to the insn after the jump. In that case
+ we invert the branch and delete the jump and save 4 bytes.
+
+ bCC:16 -> bCC:8 2 bytes
+ bsr:16 -> bsr:8 2 bytes
+
+ mov.b:16 -> mov.b:8 2 bytes
+ mov.b:24/32 -> mov.b:8 4 bytes
+
+ mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes
+
+
+*/
+
+static boolean
+elf32_h8_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;
+ 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;
+ static asection *last_input_section = NULL;
+ static Elf_Internal_Rela *last_reloc = NULL;
+
+ /* Assume nothing changes. */
+ *again = false;
+
+ /* 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;
+
+ if (sec != last_input_section)
+ last_reloc = NULL;
+
+ last_input_section = sec;
+
+ /* Walk through the relocs looking for relaxing opportunities. */
+ irelend = internal_relocs + sec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ bfd_vma symval;
+
+ /* Keep track of the previous reloc so that we can delete
+ some long jumps created by the compiler. */
+ if (irel != internal_relocs)
+ last_reloc = irel - 1;
+
+ /* 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_bread (extsyms, 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;
+
+ /* A local symbol. */
+ bfd_elf32_swap_symbol_in (abfd,
+ extsyms + ELF32_R_SYM (irel->r_info),
+ &isym);
+
+ sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx);
+ symval = (isym.st_value
+ + sym_sec->output_section->vma
+ + sym_sec->output_offset);
+ }
+ else
+ {
+ unsigned long indx;
+ struct elf_link_hash_entry *h;
+
+ /* An external symbol. */
+ indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+ h = elf_sym_hashes (abfd)[indx];
+ BFD_ASSERT (h != NULL);
+ if (h->root.type != bfd_link_hash_defined
+ && h->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.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->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. */
+ switch (ELF32_R_TYPE (irel->r_info))
+ {
+ /* Try to turn a 24 bit absolute branch/call into an 8 bit
+ pc-relative branch/call. */
+ case R_H8_DIR24R8:
+ {
+ bfd_vma value = symval + irel->r_addend;
+ bfd_vma dot, gap;
+
+ /* Get the address of this instruction. */
+ dot = (sec->output_section->vma
+ + sec->output_offset + irel->r_offset - 1);
+
+ /* Compute the distance from this insn to the branch target. */
+ gap = value - dot;
+
+ /* If the distance is within -126..+130 inclusive, then we can
+ relax this jump. +130 is valid since the target will move
+ two bytes closer if we do relax this branch. */
+ if ((int) gap >= -126 && (int) gap <= 130)
+ {
+ unsigned char code;
+
+ /* 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;
+
+ /* If the previous instruction conditionally jumped around
+ this instruction, we may be able to reverse the condition
+ and redirect the previous instruction to the target of
+ this instruction.
+
+ Such sequences are used by the compiler to deal with
+ long conditional branches. */
+ if ((int) gap <= 130
+ && (int) gap >= -128
+ && last_reloc
+ && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
+ && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
+ {
+ bfd_vma last_value;
+ asection *last_sym_sec;
+ Elf_Internal_Sym last_symbol;
+
+ /* We will need to examine the symbol used by the
+ previous relocation. */
+
+ bfd_elf32_swap_symbol_in (abfd,
+ (extsyms + ELF32_R_SYM (last_reloc->r_info)),
+ &last_symbol);
+
+ last_sym_sec
+ = bfd_section_from_elf_index (abfd, last_symbol.st_shndx);
+ last_value = (last_symbol.st_value
+ + last_sym_sec->output_section->vma
+ + last_sym_sec->output_offset);
+
+ /* Verify that the previous relocation was for a
+ branch around this instruction and that no symbol
+ exists at the current location. */
+ if (last_value == dot + 4
+ && last_reloc->r_offset + 2 == irel->r_offset
+ && ! elf32_h8_symbol_address_p (abfd, sec,
+ extsyms, dot))
+ {
+ /* We can eliminate this jump. Twiddle the
+ previous relocation as necessary. */
+ irel->r_info
+ = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ ELF32_R_TYPE (R_H8_NONE));
+
+ last_reloc->r_info
+ = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ ELF32_R_TYPE (R_H8_PCREL8));
+ last_reloc->r_addend = irel->r_addend;
+
+
+ code = bfd_get_8 (abfd,
+ contents + last_reloc->r_offset - 1);
+ code ^= 1;
+ bfd_put_8 (abfd,
+ code,
+ contents + last_reloc->r_offset - 1);
+
+ /* Delete four bytes of data. */
+ if (!elf32_h8_relax_delete_bytes (abfd, sec,
+ irel->r_offset - 1,
+ 4))
+ goto error_return;
+
+ *again = true;
+ break;
+ }
+ }
+
+ /* We could not eliminate this jump, so just shorten it. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if (code == 0x5e)
+ bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);
+ else if (code == 0x5a)
+ bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);
+ else
+ abort ();
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_H8_PCREL8);
+
+ /* Delete two bytes of data. */
+ if (!elf32_h8_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;
+ }
+ break;
+ }
+
+ /* Try to turn a 16bit pc-relative branch into a 8bit pc-relative
+ branch. */
+ case R_H8_PCREL16:
+ {
+ bfd_vma value = symval + irel->r_addend;
+ bfd_vma dot;
+ bfd_vma gap;
+
+ /* Get the address of this instruction. */
+ dot = (sec->output_section->vma
+ + sec->output_offset
+ + irel->r_offset - 2);
+
+ gap = value - dot;
+
+ /* If the distance is within -126..+130 inclusive, then we can
+ relax this jump. +130 is valid since the target will move
+ two bytes closer if we do relax this branch. */
+ if ((int)gap >= -126 && (int)gap <= 130)
+ {
+ unsigned char code;
+
+ /* 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;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
+
+ if (code == 0x58)
+ {
+ /* bCC:16 -> bCC:8 */
+ /* Get the condition code from the original insn. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+ code &= 0xf0;
+ code >>= 4;
+ code |= 0x40;
+ bfd_put_8 (abfd, code, contents + irel->r_offset - 2);
+ }
+ else if (code == 0x5c)
+ bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);
+ else
+ abort ();
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_H8_PCREL8);
+ irel->r_offset--;
+
+ /* Delete two bytes of data. */
+ if (!elf32_h8_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;
+ }
+ break;
+ }
+
+ /* This is a 16 bit absolute address in a "mov.b" insn, which may
+ become an 8 bit absolute address if its in the right range. */
+ case R_H8_DIR16A8:
+ {
+ bfd_vma value = symval + irel->r_addend;
+
+ if ((bfd_get_mach (abfd) == bfd_mach_h8300
+ && value >= 0xff00
+ && value <= 0xffff)
+ || ((bfd_get_mach (abfd) == bfd_mach_h8300h
+ || bfd_get_mach (abfd) == bfd_mach_h8300s)
+ && value >= 0xffff00
+ && value <= 0xffffff))
+ {
+ unsigned char code;
+
+ /* 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;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
+
+ /* Sanity check. */
+ if (code != 0x6a)
+ abort ();
+
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if ((code & 0xf0) == 0x00)
+ bfd_put_8 (abfd,
+ (code & 0xf) | 0x20,
+ contents + irel->r_offset - 2);
+ else if ((code & 0xf0) == 0x80)
+ bfd_put_8 (abfd,
+ (code & 0xf) | 0x30,
+ contents + irel->r_offset - 2);
+ else
+ abort ();
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_H8_DIR8);
+
+ /* Delete two bytes of data. */
+ if (!elf32_h8_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;
+ }
+ break;
+ }
+
+ /* This is a 24 bit absolute address in a "mov.b" insn, which may
+ become an 8 bit absolute address if its in the right range. */
+ case R_H8_DIR24A8:
+ {
+ bfd_vma value = symval + irel->r_addend;
+
+ if ((bfd_get_mach (abfd) == bfd_mach_h8300
+ && value >= 0xff00
+ && value <= 0xffff)
+ || ((bfd_get_mach (abfd) == bfd_mach_h8300h
+ || bfd_get_mach (abfd) == bfd_mach_h8300s)
+ && value >= 0xffff00
+ && value <= 0xffffff))
+ {
+ unsigned char code;
+
+ /* 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;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 2);
+
+ /* Sanity check. */
+ if (code != 0x6a)
+ abort ();
+
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ if ((code & 0xf0) == 0x00)
+ bfd_put_8 (abfd,
+ (code & 0xf) | 0x20,
+ contents + irel->r_offset - 2);
+ else if ((code & 0xf0) == 0x80)
+ bfd_put_8 (abfd,
+ (code & 0xf) | 0x30,
+ contents + irel->r_offset - 2);
+ else
+ abort ();
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_H8_DIR8);
+
+ /* Delete two bytes of data. */
+ if (!elf32_h8_relax_delete_bytes (abfd, sec, irel->r_offset, 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;
+ }
+ }
+
+ /* FALLTHRU */
+
+ /* This is a 24/32bit absolute address in a "mov" insn, which may
+ become a 16bit absoulte address if it is in the right range. */
+ case R_H8_DIR32A16:
+ {
+ bfd_vma value = symval + irel->r_addend;
+
+ if (value <= 0x7fff || value >= 0xff8000)
+ {
+ unsigned char code;
+
+ /* 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;
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+
+ /* We just need to turn off bit 0x20. */
+ code &= ~0x20;
+
+ 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_H8_DIR16A8);
+
+ /* Delete two bytes of data. */
+ if (!elf32_h8_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;
+ }
+ break;
+ }
+
+ default:
+ 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 = (unsigned char *) 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;
+}
+
+/* Delete some bytes from a section while relaxing. */
+
+static boolean
+elf32_h8_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 elf_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,
+ (size_t) (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 = elf_sym_hashes (abfd)[index];
+ if (isym.st_shndx == shndx
+ && ((sym_hash)->root.type == bfd_link_hash_defined
+ || (sym_hash)->root.type == bfd_link_hash_defweak)
+ && (sym_hash)->root.u.def.section == sec
+ && (sym_hash)->root.u.def.value > addr
+ && (sym_hash)->root.u.def.value < toaddr)
+ {
+ (sym_hash)->root.u.def.value -= count;
+ }
+ }
+
+ return true;
+}
+
+/* Return true if a symbol exists at the given address, else return
+ false. */
+static boolean
+elf32_h8_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 elf_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 = 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.type == bfd_link_hash_defined
+ || (*sym_hash)->root.type == bfd_link_hash_defweak)
+ && (*sym_hash)->root.u.def.section == sec
+ && (*sym_hash)->root.u.def.value == addr)
+ return true;
+ }
+ return false;
+}
+
+/* This is a version of bfd_generic_get_relocated_section_contents
+ which uses elf32_h8_relocate_section. */
+
+static bfd_byte *
+elf32_h8_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,
+ (size_t) 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
+ {
+ bfd_size_type amt;
+
+ amt = symtab_hdr->sh_info;
+ amt *= sizeof (Elf32_External_Sym);
+ external_syms = (Elf32_External_Sym *) bfd_malloc (amt);
+ 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_bread (external_syms, amt, input_bfd) != amt)
+ 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 ((bfd_size_type) symtab_hdr->sh_info
+ * sizeof (Elf_Internal_Sym)));
+ if (internal_syms == NULL && symtab_hdr->sh_info > 0)
+ goto error_return;
+
+ sections = (asection **) bfd_malloc ((bfd_size_type) 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 (! elf32_h8_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;
+}
+
+
#define TARGET_BIG_SYM bfd_elf32_h8300_vec
#define TARGET_BIG_NAME "elf32-h8300"
#define ELF_ARCH bfd_arch_h8300
#define elf_info_to_howto elf32_h8_info_to_howto
#define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
+/* So we can set/examine bits in e_flags to get the specific
+ H8 architecture in use. */
+#define elf_backend_final_write_processing \
+ elf32_h8_final_write_processing
+#define elf_backend_object_p \
+ elf32_h8_object_p
+#define bfd_elf32_bfd_merge_private_bfd_data \
+ elf32_h8_merge_private_bfd_data
+
/* ??? when elf_backend_relocate_section is not defined, elf32-target.h
defaults to using _bfd_generic_link_hash_table_create, but
elflink.h:bfd_elf32_size_dynamic_sections uses
and thus requires an elf hash table. */
#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
+/* Use an H8 specific linker, not the ELF generic linker. */
+#define elf_backend_relocate_section elf32_h8_relocate_section
+
+/* And relaxing stuff. */
+#define bfd_elf32_bfd_relax_section elf32_h8_relax_section
+#define bfd_elf32_bfd_get_relocated_section_contents \
+ elf32_h8_get_relocated_section_contents
+
+
#include "elf32-target.h"
projects / deliverable / binutils-gdb.git / blobdiff