diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-m32c.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-m32c.c | 2076 |
1 files changed, 2076 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-m32c.c b/binutils-2.25/bfd/elf32-m32c.c new file mode 100644 index 00000000..8e77c5ec --- /dev/null +++ b/binutils-2.25/bfd/elf32-m32c.c @@ -0,0 +1,2076 @@ +/* M16C/M32C specific support for 32-bit ELF. + Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 + 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/m32c.h" +#include "libiberty.h" + +/* Forward declarations. */ +static reloc_howto_type * m32c_reloc_type_lookup + (bfd *, bfd_reloc_code_real_type); +static void m32c_info_to_howto_rela + (bfd *, arelent *, Elf_Internal_Rela *); +static bfd_boolean m32c_elf_relocate_section + (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **); +static bfd_boolean m32c_elf_check_relocs + (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *); +static bfd_boolean m32c_elf_relax_delete_bytes (bfd *, asection *, bfd_vma, int); +#ifdef DEBUG +char * m32c_get_reloc (long reloc); +void dump_symtab (bfd *, void *, void *); +#endif +static bfd_boolean m32c_elf_relax_section +(bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again); + + +static reloc_howto_type m32c_elf_howto_table [] = +{ + /* This reloc does nothing. */ + HOWTO (R_M32C_NONE, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_NONE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* GCC intentionally overflows these next two in order to work + around limitations in the addressing modes, so don't complain + about overflow. */ + HOWTO (R_M32C_16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_24, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 24, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_24", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_8_PCREL, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_8_PCREL", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (R_M32C_16_PCREL, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_16_PCREL", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (R_M32C_8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_unsigned, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_LO16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_LO16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_HI8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_HI8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_HI16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_HI16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_RL_JUMP, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_RL_JUMP", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_RL_1ADDR, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_RL_1ADDR", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (R_M32C_RL_2ADDR, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_M32C_RL_2ADDR", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + +}; + +/* Map BFD reloc types to M32C ELF reloc types. */ + +struct m32c_reloc_map +{ + bfd_reloc_code_real_type bfd_reloc_val; + unsigned int m32c_reloc_val; +}; + +static const struct m32c_reloc_map m32c_reloc_map [] = +{ + { BFD_RELOC_NONE, R_M32C_NONE }, + { BFD_RELOC_16, R_M32C_16 }, + { BFD_RELOC_24, R_M32C_24 }, + { BFD_RELOC_32, R_M32C_32 }, + { BFD_RELOC_8_PCREL, R_M32C_8_PCREL }, + { BFD_RELOC_16_PCREL, R_M32C_16_PCREL }, + { BFD_RELOC_8, R_M32C_8 }, + { BFD_RELOC_LO16, R_M32C_LO16 }, + { BFD_RELOC_HI16, R_M32C_HI16 }, + { BFD_RELOC_M32C_HI8, R_M32C_HI8 }, + { BFD_RELOC_M32C_RL_JUMP, R_M32C_RL_JUMP }, + { BFD_RELOC_M32C_RL_1ADDR, R_M32C_RL_1ADDR }, + { BFD_RELOC_M32C_RL_2ADDR, R_M32C_RL_2ADDR } +}; + +static reloc_howto_type * +m32c_reloc_type_lookup + (bfd * abfd ATTRIBUTE_UNUSED, + bfd_reloc_code_real_type code) +{ + unsigned int i; + + for (i = ARRAY_SIZE (m32c_reloc_map); --i;) + if (m32c_reloc_map [i].bfd_reloc_val == code) + return & m32c_elf_howto_table [m32c_reloc_map[i].m32c_reloc_val]; + + return NULL; +} + +static reloc_howto_type * +m32c_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) +{ + unsigned int i; + + for (i = 0; + i < sizeof (m32c_elf_howto_table) / sizeof (m32c_elf_howto_table[0]); + i++) + if (m32c_elf_howto_table[i].name != NULL + && strcasecmp (m32c_elf_howto_table[i].name, r_name) == 0) + return &m32c_elf_howto_table[i]; + + return NULL; +} + +/* Set the howto pointer for an M32C ELF reloc. */ + +static void +m32c_info_to_howto_rela + (bfd * abfd ATTRIBUTE_UNUSED, + arelent * cache_ptr, + Elf_Internal_Rela * dst) +{ + unsigned int r_type; + + r_type = ELF32_R_TYPE (dst->r_info); + BFD_ASSERT (r_type < (unsigned int) R_M32C_max); + cache_ptr->howto = & m32c_elf_howto_table [r_type]; +} + + + +/* Relocate an M32C ELF section. + There is some attempt to make this function usable for many architectures, + both USE_REL and USE_RELA ['twould be nice if such a critter existed], + if only to serve as a learning tool. + + The RELOCATE_SECTION function is called by the new ELF backend linker + to handle the relocations for a section. + + The relocs are always passed as Rela structures; if the section + actually uses Rel structures, the r_addend field will always be + zero. + + This function is responsible for adjusting the section contents as + necessary, and (if using Rela relocs and generating a relocatable + output file) adjusting the reloc addend as necessary. + + This function does not have to worry about setting the reloc + address or the reloc symbol index. + + LOCAL_SYMS is a pointer to the swapped in local symbols. + + LOCAL_SECTIONS is an array giving the section in the input file + corresponding to the st_shndx field of each local symbol. + + The global hash table entry for the global symbols can be found + via elf_sym_hashes (input_bfd). + + When generating relocatable output, this function must handle + STB_LOCAL/STT_SECTION symbols specially. The output symbol is + going to be the section symbol corresponding to the output + section, which means that the addend must be adjusted + accordingly. */ + +static bfd_boolean +m32c_elf_relocate_section + (bfd * output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info * info, + bfd * input_bfd, + asection * input_section, + bfd_byte * contents, + Elf_Internal_Rela * relocs, + Elf_Internal_Sym * local_syms, + asection ** local_sections) +{ + Elf_Internal_Shdr * symtab_hdr; + struct elf_link_hash_entry ** sym_hashes; + Elf_Internal_Rela * rel; + Elf_Internal_Rela * relend; + bfd *dynobj; + asection *splt; + + symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + relend = relocs + input_section->reloc_count; + + dynobj = elf_hash_table (info)->dynobj; + splt = NULL; + if (dynobj != NULL) + splt = bfd_get_linker_section (dynobj, ".plt"); + + for (rel = relocs; rel < relend; rel ++) + { + reloc_howto_type * howto; + unsigned long r_symndx; + Elf_Internal_Sym * sym; + asection * sec; + struct elf_link_hash_entry * h; + bfd_vma relocation; + bfd_reloc_status_type r; + const char * name = NULL; + int r_type; + + r_type = ELF32_R_TYPE (rel->r_info); + + /* These are only used for relaxing; we don't actually relocate + anything with them, so skip them. */ + if (r_type == R_M32C_RL_JUMP + || r_type == R_M32C_RL_1ADDR + || r_type == R_M32C_RL_2ADDR) + continue; + + r_symndx = ELF32_R_SYM (rel->r_info); + + howto = m32c_elf_howto_table + ELF32_R_TYPE (rel->r_info); + h = NULL; + sym = NULL; + sec = NULL; + relocation = 0; + + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections [r_symndx]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + + name = bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name); + name = (sym->st_name == 0) ? bfd_section_name (input_bfd, sec) : name; + } + else + { + h = sym_hashes [r_symndx - symtab_hdr->sh_info]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + name = h->root.root.string; + + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + ; + else if (!info->relocatable) + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset, TRUE))) + return FALSE; + } + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (info->relocatable) + { + /* This is a relocatable 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 (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) + rel->r_addend += sec->output_offset; + continue; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_M32C_16: + { + bfd_vma *plt_offset; + + if (h != NULL) + plt_offset = &h->plt.offset; + else + plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; + + /* printf("%s: rel %x plt %d\n", h ? h->root.root.string : "(none)", + relocation, *plt_offset);*/ + if (relocation <= 0xffff) + { + /* If the symbol is in range for a 16-bit address, we should + have deallocated the plt entry in relax_section. */ + BFD_ASSERT (*plt_offset == (bfd_vma) -1); + } + else + { + /* If the symbol is out of range for a 16-bit address, + we must have allocated a plt entry. */ + BFD_ASSERT (*plt_offset != (bfd_vma) -1); + + /* If this is the first time we've processed this symbol, + fill in the plt entry with the correct symbol address. */ + if ((*plt_offset & 1) == 0) + { + unsigned int x; + + x = 0x000000fc; /* jmpf */ + x |= (relocation << 8) & 0xffffff00; + bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); + *plt_offset |= 1; + } + + relocation = (splt->output_section->vma + + splt->output_offset + + (*plt_offset & -2)); + if (name) + { + char *newname = bfd_malloc (strlen(name)+5); + strcpy (newname, name); + strcat(newname, ".plt"); + _bfd_generic_link_add_one_symbol (info, + input_bfd, + newname, + BSF_FUNCTION | BSF_WEAK, + splt, + (*plt_offset & -2), + 0, + 1, + 0, + 0); + } + } + } + break; + + case R_M32C_HI8: + case R_M32C_HI16: + relocation >>= 16; + break; + } + +#if 0 + printf ("relocate %s at %06lx relocation %06lx addend %ld ", + m32c_elf_howto_table[ELF32_R_TYPE(rel->r_info)].name, + rel->r_offset + input_section->output_section->vma + input_section->output_offset, + relocation, rel->r_addend); + { + int i; + for (i=0; i<4; i++) + printf (" %02x", contents[rel->r_offset+i]); + printf ("\n"); + } +#endif + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, relocation, + rel->r_addend); + + if (r != bfd_reloc_ok) + { + const char * msg = (const char *) NULL; + + switch (r) + { + case bfd_reloc_overflow: + r = info->callbacks->reloc_overflow + (info, (h ? &h->root : NULL), name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset); + break; + + case bfd_reloc_undefined: + r = info->callbacks->undefined_symbol + (info, name, input_bfd, input_section, rel->r_offset, + TRUE); + break; + + case bfd_reloc_outofrange: + msg = _("internal error: out of range error"); + break; + + case bfd_reloc_notsupported: + msg = _("internal error: unsupported relocation error"); + break; + + case bfd_reloc_dangerous: + msg = _("internal error: dangerous relocation"); + break; + + default: + msg = _("internal error: unknown error"); + break; + } + + if (msg) + r = info->callbacks->warning + (info, msg, name, input_bfd, input_section, rel->r_offset); + + if (! r) + return FALSE; + } + } + + return TRUE; +} + +/* We support 16-bit pointers to code above 64k by generating a thunk + below 64k containing a JMP instruction to the final address. */ + +static bfd_boolean +m32c_elf_check_relocs + (bfd * abfd, + struct bfd_link_info * info, + asection * sec, + const Elf_Internal_Rela * relocs) +{ + Elf_Internal_Shdr * symtab_hdr; + struct elf_link_hash_entry ** sym_hashes; + const Elf_Internal_Rela * rel; + const Elf_Internal_Rela * rel_end; + bfd_vma *local_plt_offsets; + asection *splt; + bfd *dynobj; + + if (info->relocatable) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + local_plt_offsets = elf_local_got_offsets (abfd); + splt = NULL; + dynobj = elf_hash_table(info)->dynobj; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + struct elf_link_hash_entry *h; + unsigned long r_symndx; + bfd_vma *offset; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + /* This relocation describes a 16-bit pointer to a function. + We may need to allocate a thunk in low memory; reserve memory + for it now. */ + case R_M32C_16: + if (dynobj == NULL) + elf_hash_table (info)->dynobj = dynobj = abfd; + if (splt == NULL) + { + splt = bfd_get_linker_section (dynobj, ".plt"); + if (splt == NULL) + { + flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS + | SEC_IN_MEMORY | SEC_LINKER_CREATED + | SEC_READONLY | SEC_CODE); + splt = bfd_make_section_anyway_with_flags (dynobj, ".plt", + flags); + if (splt == NULL + || ! bfd_set_section_alignment (dynobj, splt, 1)) + return FALSE; + } + } + + if (h != NULL) + offset = &h->plt.offset; + else + { + if (local_plt_offsets == NULL) + { + size_t size; + unsigned int i; + + size = symtab_hdr->sh_info * sizeof (bfd_vma); + local_plt_offsets = (bfd_vma *) bfd_alloc (abfd, size); + if (local_plt_offsets == NULL) + return FALSE; + elf_local_got_offsets (abfd) = local_plt_offsets; + + for (i = 0; i < symtab_hdr->sh_info; i++) + local_plt_offsets[i] = (bfd_vma) -1; + } + offset = &local_plt_offsets[r_symndx]; + } + + if (*offset == (bfd_vma) -1) + { + *offset = splt->size; + splt->size += 4; + } + break; + } + } + + return TRUE; +} + +/* This must exist if dynobj is ever set. */ + +static bfd_boolean +m32c_elf_finish_dynamic_sections (bfd *abfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *splt; + + /* As an extra sanity check, verify that all plt entries have + been filled in. */ + + if ((dynobj = elf_hash_table (info)->dynobj) != NULL + && (splt = bfd_get_linker_section (dynobj, ".plt")) != NULL) + { + bfd_byte *contents = splt->contents; + unsigned int i, size = splt->size; + for (i = 0; i < size; i += 4) + { + unsigned int x = bfd_get_32 (dynobj, contents + i); + BFD_ASSERT (x != 0); + } + } + + return TRUE; +} + +static bfd_boolean +m32c_elf_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *splt; + + if (info->relocatable) + return TRUE; + + dynobj = elf_hash_table (info)->dynobj; + if (dynobj == NULL) + return TRUE; + + splt = bfd_get_linker_section (dynobj, ".plt"); + BFD_ASSERT (splt != NULL); + + splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->size); + if (splt->contents == NULL) + return FALSE; + + return TRUE; +} + +/* Function to set the ELF flag bits. */ + +static bfd_boolean +m32c_elf_set_private_flags (bfd *abfd, flagword flags) +{ + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = TRUE; + return TRUE; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +m32c_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + flagword old_flags, old_partial; + flagword new_flags, new_partial; + bfd_boolean error = FALSE; + char new_opt[80]; + char old_opt[80]; + + new_opt[0] = old_opt[0] = '\0'; + new_flags = elf_elfheader (ibfd)->e_flags; + old_flags = elf_elfheader (obfd)->e_flags; + +#ifdef DEBUG + (*_bfd_error_handler) ("old_flags = 0x%.8lx, new_flags = 0x%.8lx, init = %s, filename = %s", + old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no", + bfd_get_filename (ibfd)); +#endif + + if (!elf_flags_init (obfd)) + { + /* First call, no flags set. */ + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = new_flags; + } + + else if (new_flags == old_flags) + /* Compatible flags are ok. */ + ; + + else /* Possibly incompatible flags. */ + { + /* Warn if different cpu is used (allow a specific cpu to override + the generic cpu). */ + new_partial = (new_flags & EF_M32C_CPU_MASK); + old_partial = (old_flags & EF_M32C_CPU_MASK); + if (new_partial == old_partial) + ; + + else + { + switch (new_partial) + { + default: strcat (new_opt, " -m16c"); break; + case EF_M32C_CPU_M16C: strcat (new_opt, " -m16c"); break; + case EF_M32C_CPU_M32C: strcat (new_opt, " -m32c"); break; + } + + switch (old_partial) + { + default: strcat (old_opt, " -m16c"); break; + case EF_M32C_CPU_M16C: strcat (old_opt, " -m16c"); break; + case EF_M32C_CPU_M32C: strcat (old_opt, " -m32c"); break; + } + } + + /* Print out any mismatches from above. */ + if (new_opt[0]) + { + error = TRUE; + (*_bfd_error_handler) + (_("%s: compiled with %s and linked with modules compiled with %s"), + bfd_get_filename (ibfd), new_opt, old_opt); + } + + new_flags &= ~ EF_M32C_ALL_FLAGS; + old_flags &= ~ EF_M32C_ALL_FLAGS; + + /* Warn about any other mismatches. */ + if (new_flags != old_flags) + { + error = TRUE; + (*_bfd_error_handler) + (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), + bfd_get_filename (ibfd), (long)new_flags, (long)old_flags); + } + } + + if (error) + bfd_set_error (bfd_error_bad_value); + + return !error; +} + + +static bfd_boolean +m32c_elf_print_private_bfd_data (bfd *abfd, void *ptr) +{ + FILE *file = (FILE *) ptr; + flagword flags; + + BFD_ASSERT (abfd != NULL && ptr != NULL); + + /* Print normal ELF private data. */ + _bfd_elf_print_private_bfd_data (abfd, ptr); + + flags = elf_elfheader (abfd)->e_flags; + fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags); + + switch (flags & EF_M32C_CPU_MASK) + { + default: break; + case EF_M32C_CPU_M16C: fprintf (file, " -m16c"); break; + case EF_M32C_CPU_M32C: fprintf (file, " -m32c"); break; + } + + fputc ('\n', file); + return TRUE; +} + +/* Return the MACH for an e_flags value. */ + +static int +elf32_m32c_machine (bfd *abfd) +{ + switch (elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK) + { + case EF_M32C_CPU_M16C: return bfd_mach_m16c; + case EF_M32C_CPU_M32C: return bfd_mach_m32c; + } + + return bfd_mach_m16c; +} + +static bfd_boolean +m32c_elf_object_p (bfd *abfd) +{ + bfd_default_set_arch_mach (abfd, bfd_arch_m32c, + elf32_m32c_machine (abfd)); + return TRUE; +} + + +#ifdef DEBUG +void +dump_symtab (bfd * abfd, void *internal_syms, void *external_syms) +{ + size_t locsymcount; + Elf_Internal_Sym *isymbuf; + Elf_Internal_Sym *isymend; + Elf_Internal_Sym *isym; + Elf_Internal_Shdr *symtab_hdr; + bfd_boolean free_internal = 0, free_external = 0; + char * st_info_str; + char * st_info_stb_str; + char * st_other_str; + char * st_shndx_str; + + if (! internal_syms) + { + internal_syms = bfd_malloc (1000); + free_internal = 1; + } + if (! external_syms) + { + external_syms = bfd_malloc (1000); + free_external = 1; + } + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + locsymcount = symtab_hdr->sh_size / get_elf_backend_data(abfd)->s->sizeof_sym; + if (free_internal) + isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, + symtab_hdr->sh_info, 0, + internal_syms, external_syms, NULL); + else + isymbuf = internal_syms; + isymend = isymbuf + locsymcount; + + for (isym = isymbuf ; isym < isymend ; isym++) + { + switch (ELF_ST_TYPE (isym->st_info)) + { + case STT_FUNC: + st_info_str = "STT_FUNC"; + break; + + case STT_SECTION: + st_info_str = "STT_SECTION"; + break; + + case STT_FILE: + st_info_str = "STT_FILE"; + break; + + case STT_OBJECT: + st_info_str = "STT_OBJECT"; + break; + + case STT_TLS: + st_info_str = "STT_TLS"; + break; + + default: + st_info_str = ""; + } + + switch (ELF_ST_BIND (isym->st_info)) + { + case STB_LOCAL: + st_info_stb_str = "STB_LOCAL"; + break; + + case STB_GLOBAL: + st_info_stb_str = "STB_GLOBAL"; + break; + + default: + st_info_stb_str = ""; + } + + switch (ELF_ST_VISIBILITY (isym->st_other)) + { + case STV_DEFAULT: + st_other_str = "STV_DEFAULT"; + break; + + case STV_INTERNAL: + st_other_str = "STV_INTERNAL"; + break; + + case STV_PROTECTED: + st_other_str = "STV_PROTECTED"; + break; + + default: + st_other_str = ""; + } + + switch (isym->st_shndx) + { + case SHN_ABS: + st_shndx_str = "SHN_ABS"; + break; + + case SHN_COMMON: + st_shndx_str = "SHN_COMMON"; + break; + + case SHN_UNDEF: + st_shndx_str = "SHN_UNDEF"; + break; + + default: + st_shndx_str = ""; + } + + printf ("isym = %p st_value = %lx st_size = %lx st_name = (%lu) %s " + "st_info = (%d) %s %s st_other = (%d) %s st_shndx = (%d) %s\n", + isym, + (unsigned long) isym->st_value, + (unsigned long) isym->st_size, + isym->st_name, + bfd_elf_string_from_elf_section (abfd, symtab_hdr->sh_link, + isym->st_name), + isym->st_info, st_info_str, st_info_stb_str, + isym->st_other, st_other_str, + isym->st_shndx, st_shndx_str); + } + if (free_internal) + free (internal_syms); + if (free_external) + free (external_syms); +} + +char * +m32c_get_reloc (long reloc) +{ + if (0 <= reloc && reloc < R_M32C_max) + return m32c_elf_howto_table[reloc].name; + else + return ""; +} +#endif /* DEBUG */ + +/* Handle relaxing. */ + +/* A subroutine of m32c_elf_relax_section. If the global symbol H + is within the low 64k, remove any entry for it in the plt. */ + +struct relax_plt_data +{ + asection *splt; + bfd_boolean *again; +}; + +static bfd_boolean +m32c_relax_plt_check (struct elf_link_hash_entry *h, void * xdata) +{ + struct relax_plt_data *data = (struct relax_plt_data *) xdata; + + if (h->plt.offset != (bfd_vma) -1) + { + bfd_vma address; + + if (h->root.type == bfd_link_hash_undefined + || h->root.type == bfd_link_hash_undefweak) + address = 0; + else + address = (h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset + + h->root.u.def.value); + + if (address <= 0xffff) + { + h->plt.offset = -1; + data->splt->size -= 4; + *data->again = TRUE; + } + } + + return TRUE; +} + +/* A subroutine of m32c_elf_relax_section. If the global symbol H + previously had a plt entry, give it a new entry offset. */ + +static bfd_boolean +m32c_relax_plt_realloc (struct elf_link_hash_entry *h, void * xdata) +{ + bfd_vma *entry = (bfd_vma *) xdata; + + if (h->plt.offset != (bfd_vma) -1) + { + h->plt.offset = *entry; + *entry += 4; + } + + return TRUE; +} + +static bfd_boolean +m32c_elf_relax_plt_section (asection *splt, + struct bfd_link_info *info, + bfd_boolean *again) +{ + struct relax_plt_data relax_plt_data; + bfd *ibfd; + + /* Assume nothing changes. */ + *again = FALSE; + + if (info->relocatable) + return TRUE; + + /* Quick check for an empty plt. */ + if (splt->size == 0) + return TRUE; + + /* Map across all global symbols; see which ones happen to + fall in the low 64k. */ + relax_plt_data.splt = splt; + relax_plt_data.again = again; + elf_link_hash_traverse (elf_hash_table (info), m32c_relax_plt_check, + &relax_plt_data); + + /* Likewise for local symbols, though that's somewhat less convenient + as we have to walk the list of input bfds and swap in symbol data. */ + for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) + { + bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Sym *isymbuf = NULL; + unsigned int idx; + + if (! local_plt_offsets) + continue; + + symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; + if (symtab_hdr->sh_info != 0) + { + isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; + if (isymbuf == NULL) + isymbuf = bfd_elf_get_elf_syms (ibfd, symtab_hdr, + symtab_hdr->sh_info, 0, + NULL, NULL, NULL); + if (isymbuf == NULL) + return FALSE; + } + + for (idx = 0; idx < symtab_hdr->sh_info; ++idx) + { + Elf_Internal_Sym *isym; + asection *tsec; + bfd_vma address; + + if (local_plt_offsets[idx] == (bfd_vma) -1) + continue; + + isym = &isymbuf[idx]; + if (isym->st_shndx == SHN_UNDEF) + continue; + else if (isym->st_shndx == SHN_ABS) + tsec = bfd_abs_section_ptr; + else if (isym->st_shndx == SHN_COMMON) + tsec = bfd_com_section_ptr; + else + tsec = bfd_section_from_elf_index (ibfd, isym->st_shndx); + + address = (tsec->output_section->vma + + tsec->output_offset + + isym->st_value); + if (address <= 0xffff) + { + local_plt_offsets[idx] = -1; + splt->size -= 4; + *again = TRUE; + } + } + + if (isymbuf != NULL + && symtab_hdr->contents != (unsigned char *) isymbuf) + { + if (! info->keep_memory) + free (isymbuf); + else + { + /* Cache the symbols for elf_link_input_bfd. */ + symtab_hdr->contents = (unsigned char *) isymbuf; + } + } + } + + /* If we changed anything, walk the symbols again to reallocate + .plt entry addresses. */ + if (*again && splt->size > 0) + { + bfd_vma entry = 0; + + elf_link_hash_traverse (elf_hash_table (info), + m32c_relax_plt_realloc, &entry); + + for (ibfd = info->input_bfds; ibfd ; ibfd = ibfd->link_next) + { + bfd_vma *local_plt_offsets = elf_local_got_offsets (ibfd); + unsigned int nlocals = elf_tdata (ibfd)->symtab_hdr.sh_info; + unsigned int idx; + + if (! local_plt_offsets) + continue; + + for (idx = 0; idx < nlocals; ++idx) + if (local_plt_offsets[idx] != (bfd_vma) -1) + { + local_plt_offsets[idx] = entry; + entry += 4; + } + } + } + + return TRUE; +} + +static int +compare_reloc (const void *e1, const void *e2) +{ + const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1; + const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2; + + if (i1->r_offset == i2->r_offset) + return 0; + else + return i1->r_offset < i2->r_offset ? -1 : 1; +} + +#define OFFSET_FOR_RELOC(rel) m32c_offset_for_reloc (abfd, rel, symtab_hdr, shndx_buf, intsyms) +static bfd_vma +m32c_offset_for_reloc (bfd *abfd, + Elf_Internal_Rela *rel, + Elf_Internal_Shdr *symtab_hdr, + Elf_External_Sym_Shndx *shndx_buf ATTRIBUTE_UNUSED, + Elf_Internal_Sym *intsyms) +{ + bfd_vma symval; + + /* Get the value of the symbol referred to by the reloc. */ + if (ELF32_R_SYM (rel->r_info) < symtab_hdr->sh_info) + { + /* A local symbol. */ + Elf_Internal_Sym *isym; + asection *ssec; + + isym = intsyms + ELF32_R_SYM (rel->r_info); + ssec = bfd_section_from_elf_index (abfd, isym->st_shndx); + symval = isym->st_value; + if (ssec) + symval += ssec->output_section->vma + + ssec->output_offset; + } + else + { + unsigned long indx; + struct elf_link_hash_entry *h; + + /* An external symbol. */ + indx = ELF32_R_SYM (rel->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. */ + return 0; + + symval = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + } + return symval; +} + +static int bytes_saved = 0; + +static int bytes_to_reloc[] = { + R_M32C_NONE, + R_M32C_8, + R_M32C_16, + R_M32C_24, + R_M32C_32 +}; + +/* What we use the bits in a relax reloc addend (R_M32C_RL_*) for. */ + +/* Mask for the number of relocs associated with this insn. */ +#define RLA_RELOCS 0x0000000f +/* Number of bytes gas emitted (before gas's relaxing) */ +#define RLA_NBYTES 0x00000ff0 + +/* If the displacement is within the given range and the new encoding + differs from the old encoding (the index), then the insn can be + relaxed to the new encoding. */ +typedef struct { + int bytes; + unsigned int max_disp; + unsigned char new_encoding; +} EncodingTable; + +static EncodingTable m16c_addr_encodings[] = { + { 0, 0, 0 }, /* R0 */ + { 0, 0, 1 }, /* R1 */ + { 0, 0, 2 }, /* R2 */ + { 0, 0, 3 }, /* R3 */ + { 0, 0, 4 }, /* A0 */ + { 0, 0, 5 }, /* A1 */ + { 0, 0, 6 }, /* [A0] */ + { 0, 0, 7 }, /* [A1] */ + { 1, 0, 6 }, /* udsp:8[A0] */ + { 1, 0, 7 }, /* udsp:8[A1] */ + { 1, 0, 10 }, /* udsp:8[SB] */ + { 1, 0, 11 }, /* sdsp:8[FB] */ + { 2, 255, 8 }, /* udsp:16[A0] */ + { 2, 255, 9 }, /* udsp:16[A1] */ + { 2, 255, 10 }, /* udsp:16[SB] */ + { 2, 0, 15 }, /* abs:16 */ +}; + +static EncodingTable m16c_jmpaddr_encodings[] = { + { 0, 0, 0 }, /* R0 */ + { 0, 0, 1 }, /* R1 */ + { 0, 0, 2 }, /* R2 */ + { 0, 0, 3 }, /* R3 */ + { 0, 0, 4 }, /* A0 */ + { 0, 0, 5 }, /* A1 */ + { 0, 0, 6 }, /* [A0] */ + { 0, 0, 7 }, /* [A1] */ + { 1, 0, 6 }, /* udsp:8[A0] */ + { 1, 0, 7 }, /* udsp:8[A1] */ + { 1, 0, 10 }, /* udsp:8[SB] */ + { 1, 0, 11 }, /* sdsp:8[FB] */ + { 3, 255, 8 }, /* udsp:20[A0] */ + { 3, 255, 9 }, /* udsp:20[A1] */ + { 2, 255, 10 }, /* udsp:16[SB] */ + { 2, 0, 15 }, /* abs:16 */ +}; + +static EncodingTable m32c_addr_encodings[] = { + { 0, 0, 0 }, /* [A0] */ + { 0, 0, 1 }, /* [A1] */ + { 0, 0, 2 }, /* A0 */ + { 0, 0, 3 }, /* A1 */ + { 1, 0, 0 }, /* udsp:8[A0] */ + { 1, 0, 1 }, /* udsp:8[A1] */ + { 1, 0, 6 }, /* udsp:8[SB] */ + { 1, 0, 7 }, /* sdsp:8[FB] */ + { 2, 255, 4 }, /* udsp:16[A0] */ + { 2, 255, 5 }, /* udsp:16[A1] */ + { 2, 255, 6 }, /* udsp:16[SB] */ + { 2, 127, 7 }, /* sdsp:16[FB] */ + { 3, 65535, 8 }, /* udsp:24[A0] */ + { 3, 65535, 9 }, /* udsp:24[A1] */ + { 3, 65535, 15 }, /* abs24 */ + { 2, 0, 15 }, /* abs16 */ + { 0, 0, 16 }, /* R2 */ + { 0, 0, 17 }, /* R3 */ + { 0, 0, 18 }, /* R0 */ + { 0, 0, 19 }, /* R1 */ + { 0, 0, 20 }, /* */ + { 0, 0, 21 }, /* */ + { 0, 0, 22 }, /* */ + { 0, 0, 23 }, /* */ + { 0, 0, 24 }, /* */ + { 0, 0, 25 }, /* */ + { 0, 0, 26 }, /* */ + { 0, 0, 27 }, /* */ + { 0, 0, 28 }, /* */ + { 0, 0, 29 }, /* */ + { 0, 0, 30 }, /* */ + { 0, 0, 31 }, /* */ +}; + +static bfd_boolean +m32c_elf_relax_section + (bfd * abfd, + asection * sec, + struct bfd_link_info * link_info, + bfd_boolean * again) +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Shdr *shndx_hdr; + Elf_Internal_Rela *internal_relocs; + Elf_Internal_Rela *free_relocs = NULL; + Elf_Internal_Rela *irel, *irelend, *srel; + bfd_byte * contents = NULL; + bfd_byte * free_contents = NULL; + Elf_Internal_Sym *intsyms = NULL; + Elf_Internal_Sym *free_intsyms = NULL; + Elf_External_Sym_Shndx *shndx_buf = NULL; + int machine; + + if (abfd == elf_hash_table (link_info)->dynobj + && (sec->flags & SEC_LINKER_CREATED) != 0 + && strcmp (sec->name, ".plt") == 0) + return m32c_elf_relax_plt_section (sec, link_info, again); + + /* Assume nothing changes. */ + *again = FALSE; + + machine = elf32_m32c_machine (abfd); + + /* 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; + shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr; + + /* Get the section contents. */ + if (elf_section_data (sec)->this_hdr.contents != NULL) + contents = elf_section_data (sec)->this_hdr.contents; + /* Go get them off disk. */ + else if (!bfd_malloc_and_get_section (abfd, sec, &contents)) + goto error_return; + + /* Read this BFD's symbols. */ + /* Get cached copy if it exists. */ + if (symtab_hdr->contents != NULL) + { + intsyms = (Elf_Internal_Sym *) symtab_hdr->contents; + } + else + { + intsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr, symtab_hdr->sh_info, 0, NULL, NULL, NULL); + symtab_hdr->contents = (bfd_byte *) intsyms; + } + + if (shndx_hdr->sh_size != 0) + { + bfd_size_type amt; + + amt = symtab_hdr->sh_info; + amt *= sizeof (Elf_External_Sym_Shndx); + shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt); + if (shndx_buf == NULL) + goto error_return; + if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0 + || bfd_bread (shndx_buf, amt, abfd) != amt) + goto error_return; + shndx_hdr->contents = (bfd_byte *) shndx_buf; + } + + /* Get a copy of the native relocations. */ + internal_relocs = (_bfd_elf_link_read_relocs + (abfd, sec, 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; + + /* The RL_ relocs must be just before the operand relocs they go + with, so we must sort them to guarantee this. */ + qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), + compare_reloc); + + /* Walk through them looking for relaxing opportunities. */ + irelend = internal_relocs + sec->reloc_count; + + for (irel = internal_relocs; irel < irelend; irel++) + { + bfd_vma symval; + unsigned char *insn, *gap, *einsn; + bfd_vma pc; + bfd_signed_vma pcrel; + int relax_relocs; + int gap_size; + int new_type; + int posn; + int enc; + EncodingTable *enctbl; + EncodingTable *e; + + if (ELF32_R_TYPE(irel->r_info) != R_M32C_RL_JUMP + && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_1ADDR + && ELF32_R_TYPE(irel->r_info) != R_M32C_RL_2ADDR) + continue; + + srel = irel; + + /* There will always be room for the relaxed insn, since it is smaller + than the one it would replace. */ + BFD_ASSERT (irel->r_offset < sec->size); + + insn = contents + irel->r_offset; + relax_relocs = irel->r_addend % 16; + + /* Ok, we only have three relocs we care about, and they're all + fake. The lower four bits of the addend is always the number + of following relocs (hence the qsort above) that are assigned + to this opcode. The next 8 bits of the addend indicates the + number of bytes in the insn. We use the rest of them + ourselves as flags for the more expensive operations (defines + above). The three relocs are: + + RL_JUMP: This marks all direct jump insns. We check the + displacement and replace them with shorter jumps if + they're in range. We also use this to find JMP.S + insns and manually shorten them when we delete bytes. + We have to decode these insns to figure out what to + do. + + RL_1ADDR: This is a :G or :Q insn, which has a single + "standard" operand. We have to extract the type + field, see if it's a wide displacement, then figure + out if we can replace it with a narrow displacement. + We don't have to decode these insns. + + RL_2ADDR: Similarly, but two "standard" operands. Note that + r_addend may still be 1, as standard operands don't + always have displacements. Gas shouldn't give us one + with zero operands, but since we don't know which one + has the displacement, we check them both anyway. + + These all point to the beginning of the insn itself, not the + operands. + + Note that we only relax one step at a time, relying on the + linker to call us repeatedly. Thus, there is no code for + JMP.A->JMP.B although that will happen in two steps. + Likewise, for 2ADDR relaxes, we do one operand per cycle. + */ + + /* Get the value of the symbol referred to by the reloc. Just + in case this is the last reloc in the list, use the RL's + addend to choose between this reloc (no addend) or the next + (yes addend, which means at least one following reloc). */ + srel = irel + (relax_relocs ? 1 : 0); + symval = OFFSET_FOR_RELOC (srel); + + /* Setting gap_size nonzero is the flag which means "something + shrunk". */ + gap_size = 0; + gap = NULL; + new_type = ELF32_R_TYPE(srel->r_info); + + pc = sec->output_section->vma + sec->output_offset + + srel->r_offset; + pcrel = symval - pc + srel->r_addend; + + if (machine == bfd_mach_m16c) + { + /* R8C / M16C */ + + switch (ELF32_R_TYPE(irel->r_info)) + { + + case R_M32C_RL_JUMP: + switch (insn[0]) + { + case 0xfe: /* jmp.b */ + if (pcrel >= 2 && pcrel <= 9) + { + /* Relax JMP.B -> JMP.S. We need to get rid of + the following reloc though. */ + insn[0] = 0x60 | (pcrel - 2); + new_type = R_M32C_NONE; + irel->r_addend = 0x10; + gap_size = 1; + gap = insn + 1; + } + break; + + case 0xf4: /* jmp.w */ + /* 128 is allowed because it will be one byte closer + after relaxing. Likewise for all other pc-rel + jumps. */ + if (pcrel <= 128 && pcrel >= -128) + { + /* Relax JMP.W -> JMP.B */ + insn[0] = 0xfe; + insn[1] = 0; + new_type = R_M32C_8_PCREL; + gap_size = 1; + gap = insn + 2; + } + break; + + case 0xfc: /* jmp.a */ + if (pcrel <= 32768 && pcrel >= -32768) + { + /* Relax JMP.A -> JMP.W */ + insn[0] = 0xf4; + insn[1] = 0; + insn[2] = 0; + new_type = R_M32C_16_PCREL; + gap_size = 1; + gap = insn + 3; + } + break; + + case 0xfd: /* jsr.a */ + if (pcrel <= 32768 && pcrel >= -32768) + { + /* Relax JSR.A -> JSR.W */ + insn[0] = 0xf5; + insn[1] = 0; + insn[2] = 0; + new_type = R_M32C_16_PCREL; + gap_size = 1; + gap = insn + 3; + } + break; + } + break; + + case R_M32C_RL_2ADDR: + /* xxxx xxxx srce dest [src-disp] [dest-disp]*/ + + enctbl = m16c_addr_encodings; + posn = 2; + enc = (insn[1] >> 4) & 0x0f; + e = & enctbl[enc]; + + if (srel->r_offset == irel->r_offset + posn + && e->new_encoding != enc + && symval <= e->max_disp) + { + insn[1] &= 0x0f; + insn[1] |= e->new_encoding << 4; + gap_size = e->bytes - enctbl[e->new_encoding].bytes; + gap = insn + posn + enctbl[e->new_encoding].bytes; + new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes]; + break; + } + if (relax_relocs == 2) + srel ++; + posn += e->bytes; + + goto try_1addr_16; + + case R_M32C_RL_1ADDR: + /* xxxx xxxx xxxx dest [disp] */ + + enctbl = m16c_addr_encodings; + posn = 2; + + /* Check the opcode for jumps. We know it's safe to + do this because all 2ADDR insns are at least two + bytes long. */ + enc = insn[0] * 256 + insn[1]; + enc &= 0xfff0; + if (enc == 0x7d20 + || enc == 0x7d00 + || enc == 0x7d30 + || enc == 0x7d10) + { + enctbl = m16c_jmpaddr_encodings; + } + + try_1addr_16: + /* srel, posn, and enc must be set here. */ + + symval = OFFSET_FOR_RELOC (srel); + enc = insn[1] & 0x0f; + e = & enctbl[enc]; + + if (srel->r_offset == irel->r_offset + posn + && e->new_encoding != enc + && symval <= e->max_disp) + { + insn[1] &= 0xf0; + insn[1] |= e->new_encoding; + gap_size = e->bytes - enctbl[e->new_encoding].bytes; + gap = insn + posn + enctbl[e->new_encoding].bytes; + new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes]; + break; + } + + break; + + } /* Ends switch (reloc type) for m16c. */ + } + else /* machine == bfd_mach_m32c */ + { + /* M32CM / M32C */ + + switch (ELF32_R_TYPE(irel->r_info)) + { + + case R_M32C_RL_JUMP: + switch (insn[0]) + { + case 0xbb: /* jmp.b */ + if (pcrel >= 2 && pcrel <= 9) + { + int p = pcrel - 2; + /* Relax JMP.B -> JMP.S. We need to get rid of + the following reloc though. */ + insn[0] = 0x4a | ((p << 3) & 0x30) | (p & 1); + new_type = R_M32C_NONE; + irel->r_addend = 0x10; + gap_size = 1; + gap = insn + 1; + } + break; + + case 0xce: /* jmp.w */ + if (pcrel <= 128 && pcrel >= -128) + { + /* Relax JMP.W -> JMP.B */ + insn[0] = 0xbb; + insn[1] = 0; + new_type = R_M32C_8_PCREL; + gap_size = 1; + gap = insn + 2; + } + break; + + case 0xcc: /* jmp.a */ + if (pcrel <= 32768 && pcrel >= -32768) + { + /* Relax JMP.A -> JMP.W */ + insn[0] = 0xce; + insn[1] = 0; + insn[2] = 0; + new_type = R_M32C_16_PCREL; + gap_size = 1; + gap = insn + 3; + } + break; + + case 0xcd: /* jsr.a */ + if (pcrel <= 32768 && pcrel >= -32768) + { + /* Relax JSR.A -> JSR.W */ + insn[0] = 0xcf; + insn[1] = 0; + insn[2] = 0; + new_type = R_M32C_16_PCREL; + gap_size = 1; + gap = insn + 3; + } + break; + } + break; + + case R_M32C_RL_2ADDR: + /* xSSS DDDx DDSS xxxx [src-disp] [dest-disp]*/ + + einsn = insn; + posn = 2; + if (einsn[0] == 1) + { + /* prefix; remove it as far as the RL reloc is concerned. */ + einsn ++; + posn ++; + } + + enctbl = m32c_addr_encodings; + enc = ((einsn[0] & 0x70) >> 2) | ((einsn[1] & 0x30) >> 4); + e = & enctbl[enc]; + + if (srel->r_offset == irel->r_offset + posn + && e->new_encoding != enc + && symval <= e->max_disp) + { + einsn[0] &= 0x8f; + einsn[0] |= (e->new_encoding & 0x1c) << 2; + einsn[1] &= 0xcf; + einsn[1] |= (e->new_encoding & 0x03) << 4; + gap_size = e->bytes - enctbl[e->new_encoding].bytes; + gap = insn + posn + enctbl[e->new_encoding].bytes; + new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes]; + break; + } + if (relax_relocs == 2) + srel ++; + posn += e->bytes; + + goto try_1addr_32; + + case R_M32C_RL_1ADDR: + /* xxxx DDDx DDxx xxxx [disp] */ + + einsn = insn; + posn = 2; + if (einsn[0] == 1) + { + /* prefix; remove it as far as the RL reloc is concerned. */ + einsn ++; + posn ++; + } + + enctbl = m32c_addr_encodings; + + try_1addr_32: + /* srel, posn, and enc must be set here. */ + + symval = OFFSET_FOR_RELOC (srel); + enc = ((einsn[0] & 0x0e) << 1) | ((einsn[1] & 0xc0) >> 6); + e = & enctbl[enc]; + + if (srel->r_offset == irel->r_offset + posn + && e->new_encoding != enc + && symval <= e->max_disp) + { + einsn[0] &= 0xf1; + einsn[0] |= (e->new_encoding & 0x1c) >> 1; + einsn[1] &= 0x3f; + einsn[1] |= (e->new_encoding & 0x03) << 6; + gap_size = e->bytes - enctbl[e->new_encoding].bytes; + gap = insn + posn + enctbl[e->new_encoding].bytes; + new_type = bytes_to_reloc[enctbl[e->new_encoding].bytes]; + break; + } + + break; + + } /* Ends switch (reloc type) for m32c. */ + } + + if (gap_size == 0) + continue; + + *again = TRUE; + + srel->r_info = ELF32_R_INFO (ELF32_R_SYM (srel->r_info), new_type); + + /* 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 *) intsyms; + free_intsyms = NULL; + + bytes_saved += gap_size; + + if (! m32c_elf_relax_delete_bytes(abfd, sec, gap - contents, gap_size)) + goto error_return; + + } /* next relocation */ + + if (free_relocs != NULL) + { + free (free_relocs); + free_relocs = NULL; + } + + if (free_contents != NULL) + { + if (! link_info->keep_memory) + free (free_contents); + /* Cache the section contents for elf_link_input_bfd. */ + else + elf_section_data (sec)->this_hdr.contents = contents; + + free_contents = NULL; + } + + if (shndx_buf != NULL) + { + shndx_hdr->contents = NULL; + free (shndx_buf); + } + + if (free_intsyms != NULL) + { + if (! link_info->keep_memory) + free (free_intsyms); + /* Cache the symbols for elf_link_input_bfd. */ + else + { + symtab_hdr->contents = NULL /* (unsigned char *) intsyms*/; + } + + free_intsyms = NULL; + } + + return TRUE; + + error_return: + if (free_relocs != NULL) + free (free_relocs); + if (free_contents != NULL) + free (free_contents); + if (shndx_buf != NULL) + { + shndx_hdr->contents = NULL; + free (shndx_buf); + } + if (free_intsyms != NULL) + free (free_intsyms); + return FALSE; +} + +/* Delete some bytes from a section while relaxing. */ + +static bfd_boolean +m32c_elf_relax_delete_bytes + (bfd * abfd, + asection * sec, + bfd_vma addr, + int count) +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Shdr *shndx_hdr; + int sec_shndx; + bfd_byte *contents; + Elf_Internal_Rela *irel; + Elf_Internal_Rela *irelend; + bfd_vma toaddr; + Elf_Internal_Sym *isym; + Elf_Internal_Sym *isymend; + Elf_Internal_Sym *intsyms; + Elf_External_Sym_Shndx *shndx_buf; + Elf_External_Sym_Shndx *shndx; + struct elf_link_hash_entry ** sym_hashes; + struct elf_link_hash_entry ** end_hashes; + unsigned int symcount; + + contents = elf_section_data (sec)->this_hdr.contents; + + 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; + + if (ELF32_R_TYPE(irel->r_info) == R_M32C_RL_JUMP + && irel->r_addend == 0x10 /* one byte insn, no relocs */ + && irel->r_offset + 1 < addr + && irel->r_offset + 7 > addr) + { + bfd_vma disp; + unsigned char *insn = &contents[irel->r_offset]; + disp = *insn; + /* This is a JMP.S, which we have to manually update. */ + if (elf32_m32c_machine (abfd) == bfd_mach_m16c) + { + if ((*insn & 0xf8) != 0x60) + continue; + disp = (disp & 7); + } + else + { + if ((*insn & 0xce) != 0x4a) + continue; + disp = ((disp & 0x30) >> 3) | (disp & 1); + } + if (irel->r_offset + disp + 2 >= addr+count) + { + disp -= count; + if (elf32_m32c_machine (abfd) == bfd_mach_m16c) + { + *insn = (*insn & 0xf8) | disp; + } + else + { + *insn = (*insn & 0xce) | ((disp & 6) << 3) | (disp & 1); + } + } + } + } + + /* Adjust the local symbols defined in this section. */ + symtab_hdr = & elf_tdata (abfd)->symtab_hdr; + intsyms = (Elf_Internal_Sym *) symtab_hdr->contents; + isym = intsyms; + isymend = isym + symtab_hdr->sh_info; + + sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + shndx_hdr = & elf_tdata (abfd)->symtab_shndx_hdr; + shndx_buf = (Elf_External_Sym_Shndx *) shndx_hdr->contents; + shndx = shndx_buf; + + for (; isym < isymend; isym++, shndx = (shndx ? shndx + 1 : NULL)) + { + /* If the symbol is in the range of memory we just moved, we + have to adjust its value. */ + if ((int) isym->st_shndx == sec_shndx + && isym->st_value > addr + && isym->st_value < toaddr) + { + isym->st_value -= count; + } + /* If the symbol *spans* the bytes we just deleted (i.e. it's + *end* is in the moved bytes but it's *start* isn't), then we + must adjust its size. */ + if ((int) isym->st_shndx == sec_shndx + && isym->st_value < addr + && isym->st_value + isym->st_size > addr + && isym->st_value + isym->st_size < toaddr) + { + isym->st_size -= 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); + // sym_hashes += symtab_hdr->sh_info; + end_hashes = sym_hashes + symcount; + + for (; sym_hashes < end_hashes; sym_hashes ++) + { + struct elf_link_hash_entry * sym_hash = * sym_hashes; + + if (sym_hash && + (sym_hash->root.type == bfd_link_hash_defined + || sym_hash->root.type == bfd_link_hash_defweak) + && sym_hash->root.u.def.section == sec) + { + if (sym_hash->root.u.def.value > addr + && sym_hash->root.u.def.value < toaddr) + { + sym_hash->root.u.def.value -= count; + } + if (sym_hash->root.u.def.value < addr + && sym_hash->root.u.def.value + sym_hash->size > addr + && sym_hash->root.u.def.value + sym_hash->size < toaddr) + { + sym_hash->size -= count; + } + } + } + + return TRUE; +} + +/* This is for versions of gcc prior to 4.3. */ +static unsigned int +_bfd_m32c_elf_eh_frame_address_size (bfd *abfd, asection *sec ATTRIBUTE_UNUSED) +{ + if ((elf_elfheader (abfd)->e_flags & EF_M32C_CPU_MASK) == EF_M32C_CPU_M16C) + return 2; + return 4; +} + + + +#define ELF_ARCH bfd_arch_m32c +#define ELF_MACHINE_CODE EM_M32C +#define ELF_MACHINE_ALT1 EM_M32C_OLD +#define ELF_MAXPAGESIZE 0x100 + +#if 0 +#define TARGET_BIG_SYM bfd_elf32_m32c_vec +#define TARGET_BIG_NAME "elf32-m32c" +#else +#define TARGET_LITTLE_SYM bfd_elf32_m32c_vec +#define TARGET_LITTLE_NAME "elf32-m32c" +#endif + +#define elf_info_to_howto_rel NULL +#define elf_info_to_howto m32c_info_to_howto_rela +#define elf_backend_object_p m32c_elf_object_p +#define elf_backend_relocate_section m32c_elf_relocate_section +#define elf_backend_check_relocs m32c_elf_check_relocs +#define elf_backend_object_p m32c_elf_object_p +#define elf_symbol_leading_char ('_') +#define elf_backend_always_size_sections \ + m32c_elf_always_size_sections +#define elf_backend_finish_dynamic_sections \ + m32c_elf_finish_dynamic_sections + +#define elf_backend_can_gc_sections 1 +#define elf_backend_eh_frame_address_size _bfd_m32c_elf_eh_frame_address_size + +#define bfd_elf32_bfd_reloc_type_lookup m32c_reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup m32c_reloc_name_lookup +#define bfd_elf32_bfd_relax_section m32c_elf_relax_section +#define bfd_elf32_bfd_set_private_flags m32c_elf_set_private_flags +#define bfd_elf32_bfd_merge_private_bfd_data m32c_elf_merge_private_bfd_data +#define bfd_elf32_bfd_print_private_bfd_data m32c_elf_print_private_bfd_data + +#include "elf32-target.h" |