URL
https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk
Subversion Repositories openrisc_me
[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [bfd/] [elf32-h8300.c] - Rev 157
Go to most recent revision | Compare with Previous | Blame | View Log
/* BFD back-end for Renesas H8/300 ELF binaries. Copyright 1993, 1995, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/h8.h" static reloc_howto_type *elf32_h8_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code); static void elf32_h8_info_to_howto (bfd *, arelent *, Elf_Internal_Rela *); static void elf32_h8_info_to_howto_rel (bfd *, arelent *, Elf_Internal_Rela *); static unsigned long elf32_h8_mach (flagword); static void elf32_h8_final_write_processing (bfd *, bfd_boolean); static bfd_boolean elf32_h8_object_p (bfd *); static bfd_boolean elf32_h8_merge_private_bfd_data (bfd *, bfd *); static bfd_boolean elf32_h8_relax_section (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); static bfd_boolean elf32_h8_relax_delete_bytes (bfd *, asection *, bfd_vma, int); static bfd_boolean elf32_h8_symbol_address_p (bfd *, asection *, bfd_vma); static bfd_byte *elf32_h8_get_relocated_section_contents (bfd *, struct bfd_link_info *, struct bfd_link_order *, bfd_byte *, bfd_boolean, asymbol **); static bfd_reloc_status_type elf32_h8_final_link_relocate (unsigned long, bfd *, bfd *, asection *, bfd_byte *, bfd_vma, bfd_vma, bfd_vma, struct bfd_link_info *, asection *, int); static bfd_boolean elf32_h8_relocate_section (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); static bfd_reloc_status_type special (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. */ static reloc_howto_type h8_elf_howto_table[] = { #define R_H8_NONE_X 0 HOWTO (R_H8_NONE, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ special, /* special_function */ "R_H8_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR32_X (R_H8_NONE_X + 1) HOWTO (R_H8_DIR32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ special, /* special_function */ "R_H8_DIR32", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR16_X (R_H8_DIR32_X + 1) HOWTO (R_H8_DIR16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ special, /* special_function */ "R_H8_DIR16", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR8_X (R_H8_DIR16_X + 1) HOWTO (R_H8_DIR8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ special, /* special_function */ "R_H8_DIR8", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0x000000ff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR16A8_X (R_H8_DIR8_X + 1) HOWTO (R_H8_DIR16A8, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ special, /* special_function */ "R_H8_DIR16A8", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1) HOWTO (R_H8_DIR16R8, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ special, /* special_function */ "R_H8_DIR16R8", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1) HOWTO (R_H8_DIR24A8, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ special, /* special_function */ "R_H8_DIR24A8", /* name */ TRUE, /* partial_inplace */ 0xff000000, /* src_mask */ 0x00ffffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1) HOWTO (R_H8_DIR24R8, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ special, /* special_function */ "R_H8_DIR24R8", /* name */ TRUE, /* partial_inplace */ 0xff000000, /* src_mask */ 0x00ffffff, /* dst_mask */ FALSE), /* pcrel_offset */ #define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1) HOWTO (R_H8_DIR32A16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ special, /* special_function */ "R_H8_DIR32A16", /* 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. */ struct elf_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned char howto_index; }; /* An array mapping BFD reloc codes to H8 ELF relocs. */ static const struct elf_reloc_map h8_reloc_map[] = { { BFD_RELOC_NONE, R_H8_NONE_X }, { BFD_RELOC_32, R_H8_DIR32_X }, { BFD_RELOC_16, R_H8_DIR16_X }, { BFD_RELOC_8, R_H8_DIR8_X }, { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X }, { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X }, { 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 (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code) { unsigned int i; for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++) { if (h8_reloc_map[i].bfd_reloc_val == code) return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index]; } return NULL; } static reloc_howto_type * elf32_h8_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (h8_elf_howto_table[0]); i++) if (h8_elf_howto_table[i].name != NULL && strcasecmp (h8_elf_howto_table[i].name, r_name) == 0) return &h8_elf_howto_table[i]; return NULL; } static void elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc, Elf_Internal_Rela *elf_reloc) { unsigned int r; unsigned int i; r = ELF32_R_TYPE (elf_reloc->r_info); for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++) if (h8_elf_howto_table[i].type == r) { bfd_reloc->howto = &h8_elf_howto_table[i]; return; } abort (); } static void elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc, Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED) { unsigned int r; abort (); r = ELF32_R_TYPE (elf_reloc->r_info); 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 (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 (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 32-bit 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 32-bit 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; } } /* Relocate an H8 ELF section. */ static bfd_boolean elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info, bfd *input_bfd, asection *input_section, bfd_byte *contents, Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms, asection **local_sections) { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Rela *rel, *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; arelent bfd_reloc; reloc_howto_type *howto; elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel); howto = bfd_reloc.howto; r_symndx = ELF32_R_SYM (rel->r_info); r_type = ELF32_R_TYPE (rel->r_info); h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections[r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); } else { bfd_boolean unresolved_reloc, warned; RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, r_symndx, symtab_hdr, sym_hashes, h, sec, relocation, unresolved_reloc, warned); } if (sec != NULL && elf_discarded_section (sec)) { /* For relocs against symbols from removed linkonce sections, or sections discarded by a linker script, we just want the section contents zeroed. Avoid any special processing. */ _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); rel->r_info = 0; rel->r_addend = 0; continue; } if (info->relocatable) continue; r = 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; 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, (h ? &h->root : NULL), 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 (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; case E_H8_MACH_H8300HN: return bfd_mach_h8300hn; case E_H8_MACH_H8300SN: return bfd_mach_h8300sn; case E_H8_MACH_H8300SX: return bfd_mach_h8300sx; case E_H8_MACH_H8300SXN: return bfd_mach_h8300sxn; } } /* 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 (bfd *abfd, bfd_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; case bfd_mach_h8300hn: val = E_H8_MACH_H8300HN; break; case bfd_mach_h8300sn: val = E_H8_MACH_H8300SN; break; case bfd_mach_h8300sx: val = E_H8_MACH_H8300SX; break; case bfd_mach_h8300sxn: val = E_H8_MACH_H8300SXN; 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 bfd_boolean elf32_h8_object_p (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 bfd_boolean elf32_h8_merge_private_bfd_data (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 are a few relaxing opportunities 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 bset:16 -> bset:8 2 bytes bset:24/32 -> bset:8 4 bytes (also applicable to other bit manipulation instructions) mov.b:16 -> mov.b:8 2 bytes mov.b:24/32 -> mov.b:8 4 bytes bset:24/32 -> bset:16 2 bytes (also applicable to other bit manipulation instructions) mov.[bwl]:24/32 -> mov.[bwl]:16 2 bytes */ static bfd_boolean elf32_h8_relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again) { Elf_Internal_Shdr *symtab_hdr; Elf_Internal_Rela *internal_relocs; Elf_Internal_Rela *irel, *irelend; bfd_byte *contents = NULL; Elf_Internal_Sym *isymbuf = 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 relocatable link, if this section does not have relocs, or if this is not a code section. */ if (link_info->relocatable || (sec->flags & SEC_RELOC) == 0 || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; /* Get a copy of the native relocations. */ internal_relocs = (_bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, link_info->keep_memory)); if (internal_relocs == NULL) goto error_return; 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; if (ELF32_R_TYPE (irel->r_info) != R_H8_DIR24R8 && ELF32_R_TYPE (irel->r_info) != R_H8_PCREL16 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR16A8 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR24A8 && ELF32_R_TYPE (irel->r_info) != R_H8_DIR32A16) 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. */ if (!bfd_malloc_and_get_section (abfd, sec, &contents)) goto error_return; } } /* Read this BFD's local symbols if we haven't done so already. */ if (isymbuf == NULL && symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) 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) { /* A local symbol. */ Elf_Internal_Sym *isym; asection *sym_sec; isym = isymbuf + ELF32_R_SYM (irel->r_info); sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); symval = isym->st_value; /* If the reloc is absolute, it will not have a symbol or section associated with it. */ if (sym_sec) symval += 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; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Get the instruction code being relaxed. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* 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. Only perform this optimisation for jumps (code 0x5a) not subroutine calls, as otherwise it could transform: mov.w r0,r0 beq .L1 jsr @_bar .L1: rts _bar: rts into: mov.w r0,r0 bne _bar rts _bar: rts which changes the call (jsr) into a branch (bne). */ if (code == 0x5a && (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_sym; /* We will need to examine the symbol used by the previous relocation. */ last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info); last_sym_sec = bfd_section_from_elf_index (abfd, last_sym->st_shndx); last_value = (last_sym->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, 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; } } if (code == 0x5e) /* This is jsr. */ bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1); else if (code == 0x5a) /* This is jmp. */ 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 16-bit pc-relative branch into a 8-bit 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; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); if (code == 0x58) { /* bCC:16 -> bCC:8 */ /* Get the second byte of the original insn, which contains the condition code. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Compute the fisrt byte of the relaxed instruction. The original sequence 0x58 0xX0 is relaxed to 0x4X, where X represents the condition code. */ code &= 0xf0; code >>= 4; code |= 0x40; bfd_put_8 (abfd, code, contents + irel->r_offset - 2); } else if (code == 0x5c) /* This is bsr. */ 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 one of the following instructions: "band", "bclr", "biand", "bild", "bior", "bist", "bixor", "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and "mov.b" We may relax this into an 8-bit absolute address if it's in the right range. */ case R_H8_DIR16A8: { bfd_vma value; value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); if (value >= 0xffffff00u) { unsigned char code; unsigned char temp_code; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); /* All instructions with R_H8_DIR16A8 start with 0x6a. */ if (code != 0x6a) abort (); temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* If this is a mov.b instruction, clear the lower nibble, which contains the source/destination register number. */ if ((temp_code & 0x10) != 0x10) temp_code &= 0xf0; switch (temp_code) { case 0x00: /* This is mov.b @aa:16,Rd. */ bfd_put_8 (abfd, (code & 0xf) | 0x20, contents + irel->r_offset - 2); break; case 0x80: /* This is mov.b Rs,@aa:16. */ bfd_put_8 (abfd, (code & 0xf) | 0x30, contents + irel->r_offset - 2); break; case 0x18: /* This is a bit-maniputation instruction that stores one bit into memory, one of "bclr", "bist", "bnot", "bset", and "bst". */ bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2); break; case 0x10: /* This is a bit-maniputation instruction that loads one bit from memory, one of "band", "biand", "bild", "bior", "bixor", "bld", "bor", "btst", and "bxor". */ bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2); break; default: abort (); } /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_H8_DIR8); /* Move the relocation. */ 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 24-bit absolute address in one of the following instructions: "band", "bclr", "biand", "bild", "bior", "bist", "bixor", "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and "mov.b" We may relax this into an 8-bit absolute address if it's in the right range. */ case R_H8_DIR24A8: { bfd_vma value; value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); if (value >= 0xffffff00u) { unsigned char code; unsigned char temp_code; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 2); /* All instructions with R_H8_DIR24A8 start with 0x6a. */ if (code != 0x6a) abort (); temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* If this is a mov.b instruction, clear the lower nibble, which contains the source/destination register number. */ if ((temp_code & 0x30) != 0x30) temp_code &= 0xf0; switch (temp_code) { case 0x20: /* This is mov.b @aa:24/32,Rd. */ bfd_put_8 (abfd, (code & 0xf) | 0x20, contents + irel->r_offset - 2); break; case 0xa0: /* This is mov.b Rs,@aa:24/32. */ bfd_put_8 (abfd, (code & 0xf) | 0x30, contents + irel->r_offset - 2); break; case 0x38: /* This is a bit-maniputation instruction that stores one bit into memory, one of "bclr", "bist", "bnot", "bset", and "bst". */ bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2); break; case 0x30: /* This is a bit-maniputation instruction that loads one bit from memory, one of "band", "biand", "bild", "bior", "bixor", "bld", "bor", "btst", and "bxor". */ bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2); break; default: abort(); } /* Fix the relocation's type. */ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_H8_DIR8); irel->r_offset--; /* Delete two bytes of data. */ if (!elf32_h8_relax_delete_bytes (abfd, sec, irel->r_offset + 1, 4)) 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; } } /* Fall through. */ /* This is a 24-/32-bit absolute address in one of the following instructions: "band", "bclr", "biand", "bild", "bior", "bist", "bixor", "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", "ldc.w", "stc.w" and "mov.[bwl]" We may relax this into an 16-bit absolute address if it's in the right range. */ case R_H8_DIR32A16: { bfd_vma value; value = bfd_h8300_pad_address (abfd, symval + irel->r_addend); if (value <= 0x7fff || value >= 0xffff8000u) { unsigned char code; /* Note that we've changed the relocs, section contents, etc. */ elf_section_data (sec)->relocs = internal_relocs; elf_section_data (sec)->this_hdr.contents = contents; symtab_hdr->contents = (unsigned char *) isymbuf; /* Get the opcode. */ code = bfd_get_8 (abfd, contents + irel->r_offset - 1); /* Fix the opcode. For all the instructions that belong to this relaxation, we simply need to turn off bit 0x20 in the previous byte. */ 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_DIR16); /* 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 (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) { if (! link_info->keep_memory) free (isymbuf); else symtab_hdr->contents = (unsigned char *) isymbuf; } if (contents != NULL && elf_section_data (sec)->this_hdr.contents != contents) { if (! link_info->keep_memory) free (contents); else { /* Cache the section contents for elf_link_input_bfd. */ elf_section_data (sec)->this_hdr.contents = contents; } } if (internal_relocs != NULL && elf_section_data (sec)->relocs != internal_relocs) free (internal_relocs); return TRUE; error_return: if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (contents != NULL && elf_section_data (sec)->this_hdr.contents != contents) free (contents); if (internal_relocs != NULL && elf_section_data (sec)->relocs != internal_relocs) free (internal_relocs); return FALSE; } /* Delete some bytes from a section while relaxing. */ static bfd_boolean elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count) { Elf_Internal_Shdr *symtab_hdr; unsigned int sec_shndx; bfd_byte *contents; Elf_Internal_Rela *irel, *irelend; Elf_Internal_Rela *irelalign; Elf_Internal_Sym *isym; Elf_Internal_Sym *isymend; bfd_vma toaddr; struct elf_link_hash_entry **sym_hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; sec_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->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->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. */ symtab_hdr = &elf_tdata (abfd)->symtab_hdr; isym = (Elf_Internal_Sym *) symtab_hdr->contents; isymend = isym + symtab_hdr->sh_info; for (; isym < isymend; isym++) { if (isym->st_shndx == sec_shndx && isym->st_value > addr && isym->st_value < toaddr) isym->st_value -= count; } /* Now adjust the global symbols defined in this section. */ symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); sym_hashes = elf_sym_hashes (abfd); end_hashes = sym_hashes + symcount; for (; sym_hashes < end_hashes; sym_hashes++) { struct elf_link_hash_entry *sym_hash = *sym_hashes; 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 && 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 bfd_boolean elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr) { Elf_Internal_Shdr *symtab_hdr; unsigned int sec_shndx; Elf_Internal_Sym *isym; Elf_Internal_Sym *isymend; struct elf_link_hash_entry **sym_hashes; struct elf_link_hash_entry **end_hashes; unsigned int symcount; sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); /* Examine all the symbols. */ symtab_hdr = &elf_tdata (abfd)->symtab_hdr; isym = (Elf_Internal_Sym *) symtab_hdr->contents; isymend = isym + symtab_hdr->sh_info; for (; isym < isymend; isym++) { if (isym->st_shndx == sec_shndx && isym->st_value == addr) return TRUE; } symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) - symtab_hdr->sh_info); sym_hashes = elf_sym_hashes (abfd); end_hashes = sym_hashes + symcount; for (; sym_hashes < end_hashes; sym_hashes++) { struct elf_link_hash_entry *sym_hash = *sym_hashes; 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 (bfd *output_bfd, struct bfd_link_info *link_info, struct bfd_link_order *link_order, bfd_byte *data, bfd_boolean relocatable, 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; Elf_Internal_Sym *isymbuf = NULL; /* We only need to handle the case of relaxing, or of having a particular set of section contents, specially. */ if (relocatable || elf_section_data (input_section)->this_hdr.contents == NULL) return bfd_generic_get_relocated_section_contents (output_bfd, link_info, link_order, data, relocatable, symbols); symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; memcpy (data, elf_section_data (input_section)->this_hdr.contents, (size_t) input_section->size); if ((input_section->flags & SEC_RELOC) != 0 && input_section->reloc_count > 0) { asection **secpp; Elf_Internal_Sym *isym, *isymend; bfd_size_type amt; internal_relocs = (_bfd_elf_link_read_relocs (input_bfd, input_section, (PTR) NULL, (Elf_Internal_Rela *) NULL, FALSE)); if (internal_relocs == NULL) goto error_return; if (symtab_hdr->sh_info != 0) { isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; if (isymbuf == NULL) isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); if (isymbuf == NULL) goto error_return; } amt = symtab_hdr->sh_info; amt *= sizeof (asection *); sections = (asection **) bfd_malloc (amt); if (sections == NULL && amt != 0) goto error_return; isymend = isymbuf + symtab_hdr->sh_info; for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp) { asection *isec; if (isym->st_shndx == SHN_UNDEF) isec = bfd_und_section_ptr; else if (isym->st_shndx == SHN_ABS) isec = bfd_abs_section_ptr; else if (isym->st_shndx == SHN_COMMON) isec = bfd_com_section_ptr; else isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx); *secpp = isec; } if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd, input_section, data, internal_relocs, isymbuf, sections)) goto error_return; if (sections != NULL) free (sections); if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (elf_section_data (input_section)->relocs != internal_relocs) free (internal_relocs); } return data; error_return: if (sections != NULL) free (sections); if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) free (isymbuf); if (internal_relocs != NULL && elf_section_data (input_section)->relocs != internal_relocs) free (internal_relocs); return NULL; } #define TARGET_BIG_SYM bfd_elf32_h8300_vec #define TARGET_BIG_NAME "elf32-h8300" #define ELF_ARCH bfd_arch_h8300 #define ELF_MACHINE_CODE EM_H8_300 #define ELF_MAXPAGESIZE 0x1 #define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup elf32_h8_reloc_name_lookup #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 bfd_elf_size_dynamic_sections uses dynobj = elf_hash_table (info)->dynobj; 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 #define elf_backend_rela_normal 1 #define elf_backend_can_gc_sections 1 /* 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"
Go to most recent revision | Compare with Previous | Blame | View Log