/* XSTORMY16-specific support for 32-bit ELF. Copyright (C) 2000, 2001 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/xstormy16.h" /* Forward declarations. */ static reloc_howto_type * xstormy16_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void xstormy16_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); static bfd_reloc_status_type xstormy16_elf_24_reloc PARAMS ((bfd *abfd, arelent *reloc_entry, asymbol *symbol, PTR data, asection *input_section, bfd *output_bfd, char **error_message)); static boolean xstormy16_elf_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static boolean xstormy16_relax_plt_check PARAMS ((struct elf_link_hash_entry *, PTR)); static boolean xstormy16_relax_plt_realloc PARAMS ((struct elf_link_hash_entry *, PTR)); static boolean xstormy16_elf_relax_section PARAMS ((bfd *abfd, asection *sec, struct bfd_link_info *link_info, boolean *again)); static boolean xstormy16_elf_always_size_sections PARAMS ((bfd *, struct bfd_link_info *)); static boolean xstormy16_elf_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); static boolean xstormy16_elf_finish_dynamic_sections PARAMS((bfd *, struct bfd_link_info *)); static boolean xstormy16_elf_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static asection * xstormy16_elf_gc_mark_hook PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static reloc_howto_type xstormy16_elf_howto_table [] = { /* This reloc does nothing. */ HOWTO (R_XSTORMY16_NONE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_NONE", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ /* A 32 bit absolute relocation. */ HOWTO (R_XSTORMY16_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_32", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* A 16 bit absolute relocation. */ HOWTO (R_XSTORMY16_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* An 8 bit absolute relocation. */ HOWTO (R_XSTORMY16_8, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 8, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_8", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* A 32 bit pc-relative relocation. */ HOWTO (R_XSTORMY16_PC32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ true, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_PC32", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ true), /* pcrel_offset */ /* A 16 bit pc-relative relocation. */ HOWTO (R_XSTORMY16_PC16, /* 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_XSTORMY16_PC16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ true), /* pcrel_offset */ /* An 8 bit pc-relative relocation. */ HOWTO (R_XSTORMY16_PC8, /* 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_XSTORMY16_PC8", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ true), /* pcrel_offset */ /* A 12-bit pc-relative relocation suitable for the branch instructions. */ HOWTO (R_XSTORMY16_REL_12, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 11, /* bitsize */ true, /* pc_relative */ 1, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_REL_12", /* name */ true, /* partial_inplace */ 0, /* src_mask */ 0x0fff, /* dst_mask */ true), /* pcrel_offset */ /* A 24-bit absolute relocation suitable for the jump instructions. */ HOWTO (R_XSTORMY16_24, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 24, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_unsigned, /* complain_on_overflow */ xstormy16_elf_24_reloc, /* special_function */ "R_XSTORMY16_24", /* name */ true, /* partial_inplace */ 0, /* src_mask */ 0xffff00ff, /* dst_mask */ true), /* pcrel_offset */ /* A 16 bit absolute relocation to a function pointer. */ HOWTO (R_XSTORMY16_FPTR16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_XSTORMY16_FPTR16", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ }; static reloc_howto_type xstormy16_elf_howto_table2 [] = { /* GNU extension to record C++ vtable hierarchy */ HOWTO (R_XSTORMY16_GNU_VTINHERIT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_XSTORMY16_GNU_VTINHERIT", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ /* GNU extension to record C++ vtable member usage */ HOWTO (R_XSTORMY16_GNU_VTENTRY, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ false, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_elf_rel_vtable_reloc_fn, /* special_function */ "R_XSTORMY16_GNU_VTENTRY", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ }; /* Map BFD reloc types to XSTORMY16 ELF reloc types. */ struct xstormy16_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int xstormy16_reloc_val; }; static const struct xstormy16_reloc_map xstormy16_reloc_map [] = { { BFD_RELOC_NONE, R_XSTORMY16_NONE }, { BFD_RELOC_32, R_XSTORMY16_32 }, { BFD_RELOC_16, R_XSTORMY16_16 }, { BFD_RELOC_8, R_XSTORMY16_8 }, { BFD_RELOC_32_PCREL, R_XSTORMY16_PC32 }, { BFD_RELOC_16_PCREL, R_XSTORMY16_PC16 }, { BFD_RELOC_8_PCREL, R_XSTORMY16_PC8 }, { BFD_RELOC_XSTORMY16_REL_12, R_XSTORMY16_REL_12 }, { BFD_RELOC_XSTORMY16_24, R_XSTORMY16_24 }, { BFD_RELOC_XSTORMY16_FPTR16, R_XSTORMY16_FPTR16 }, { BFD_RELOC_VTABLE_INHERIT, R_XSTORMY16_GNU_VTINHERIT }, { BFD_RELOC_VTABLE_ENTRY, R_XSTORMY16_GNU_VTENTRY }, }; static reloc_howto_type * xstormy16_reloc_type_lookup (abfd, code) bfd * abfd ATTRIBUTE_UNUSED; bfd_reloc_code_real_type code; { unsigned int i; for (i = sizeof (xstormy16_reloc_map) / sizeof (xstormy16_reloc_map[0]); --i;) if (xstormy16_reloc_map [i].bfd_reloc_val == code) return & xstormy16_elf_howto_table [xstormy16_reloc_map[i].xstormy16_reloc_val]; return NULL; } /* Set the howto pointer for an XSTORMY16 ELF reloc. */ static void xstormy16_info_to_howto_rela (abfd, cache_ptr, dst) bfd * abfd ATTRIBUTE_UNUSED; arelent * cache_ptr; Elf32_Internal_Rela * dst; { unsigned int r_type = ELF32_R_TYPE (dst->r_info); if (r_type <= (unsigned int) R_XSTORMY16_FPTR16) cache_ptr->howto = &xstormy16_elf_howto_table [r_type]; else if (r_type - R_XSTORMY16_GNU_VTINHERIT <= (unsigned int) R_XSTORMY16_GNU_VTENTRY) cache_ptr->howto = &xstormy16_elf_howto_table2 [r_type - R_XSTORMY16_GNU_VTINHERIT]; else abort (); } /* Handle the R_XSTORMY16_24 reloc, which has an odd bit arrangement. */ static bfd_reloc_status_type xstormy16_elf_24_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) bfd *abfd; arelent *reloc_entry; asymbol *symbol; PTR data; asection *input_section; bfd *output_bfd; char **error_message ATTRIBUTE_UNUSED; { bfd_vma relocation, x; if (output_bfd != NULL) { reloc_entry->address += input_section->output_offset; return bfd_reloc_ok; } if (reloc_entry->address > input_section->_cooked_size) return bfd_reloc_outofrange; if (bfd_is_com_section (symbol->section)) relocation = 0; else relocation = symbol->value; relocation += symbol->section->output_section->vma; relocation += symbol->section->output_offset; relocation += reloc_entry->addend; x = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); x &= 0x0000ff00; x |= relocation & 0xff; x |= (relocation << 8) & 0xffff0000; bfd_put_32 (abfd, x, (bfd_byte *) data + reloc_entry->address); if (relocation & ~ (bfd_vma) 0xffffff) return bfd_reloc_overflow; return bfd_reloc_ok; } /* We support 16-bit pointers to code above 64k by generating a thunk below 64k containing a JMPF instruction to the final address. We cannot, unfortunately, minimize the number of thunks unless the -relax switch is given, as otherwise we have no idea where the sections will fall in the address space. */ static boolean xstormy16_elf_check_relocs (abfd, info, sec, relocs) bfd *abfd; struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { const Elf_Internal_Rela *rel, *relend; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Shdr *symtab_hdr; bfd_vma *local_plt_offsets; asection *splt; bfd *dynobj; if (info->relocateable) 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; relend = relocs + sec->reloc_count; for (rel = relocs; rel < relend; ++rel) { unsigned long r_symndx; struct elf_link_hash_entry *h; 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; } 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_XSTORMY16_FPTR16: if (rel->r_addend != 0) { (*info->callbacks->warning) (info, _("non-zero addend in @fptr reloc"), 0, abfd, 0, 0); } if (dynobj == NULL) elf_hash_table (info)->dynobj = dynobj = abfd; if (splt == NULL) { splt = bfd_get_section_by_name (dynobj, ".plt"); if (splt == NULL) { splt = bfd_make_section (dynobj, ".plt"); if (splt == NULL || ! bfd_set_section_flags (dynobj, splt, (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED | SEC_READONLY | SEC_CODE)) || ! 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->_raw_size; splt->_raw_size += 4; } break; /* This relocation describes the C++ object vtable hierarchy. Reconstruct it for later use during GC. */ case R_XSTORMY16_GNU_VTINHERIT: if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) return false; break; /* This relocation describes which C++ vtable entries are actually used. Record for later use during GC. */ case R_XSTORMY16_GNU_VTENTRY: if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return false; break; } } return true; } /* A subroutine of xstormy16_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; boolean *again; }; static boolean xstormy16_relax_plt_check (h, xdata) struct elf_link_hash_entry *h; PTR 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->_cooked_size -= 4; *data->again = true; } } return true; } /* A subroutine of xstormy16_elf_relax_section. If the global symbol H previously had a plt entry, give it a new entry offset. */ static boolean xstormy16_relax_plt_realloc (h, xdata) struct elf_link_hash_entry *h; PTR xdata; { bfd_vma *entry = (bfd_vma *) xdata; if (h->plt.offset != (bfd_vma) -1) { h->plt.offset = *entry; *entry += 4; } return true; } static boolean xstormy16_elf_relax_section (dynobj, splt, info, again) bfd *dynobj; asection *splt; struct bfd_link_info *info; boolean *again; { struct relax_plt_data relax_plt_data; bfd *ibfd; /* Assume nothing changes. */ *again = false; if (info->relocateable) return true; /* We only relax the .plt section at the moment. */ if (dynobj != elf_hash_table (info)->dynobj || strcmp (splt->name, ".plt") != 0) return true; /* Quick check for an empty plt. */ if (splt->_raw_size == 0) return true; /* If this is the first time we have been called for this section, initialize the cooked size. */ if (splt->_cooked_size == 0) splt->_cooked_size = splt->_raw_size; /* 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), xstormy16_relax_plt_check, &relax_plt_data); /* Likewise for local symbols, though that's somewhat less convenient as we have 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; Elf32_External_Sym *extsyms; unsigned int idx; if (! local_plt_offsets) continue; symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; if (symtab_hdr->contents != NULL) extsyms = (Elf32_External_Sym *) symtab_hdr->contents; else { extsyms = (Elf32_External_Sym *) bfd_malloc (symtab_hdr->sh_size); if (extsyms == NULL) return false; if (bfd_seek (ibfd, symtab_hdr->sh_offset, SEEK_SET) != 0 || (bfd_bread (extsyms, symtab_hdr->sh_size, ibfd) != symtab_hdr->sh_size)) { free (extsyms); 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; bfd_elf32_swap_symbol_in (ibfd, extsyms + idx, &isym); if (isym.st_shndx == SHN_UNDEF) continue; else if (isym.st_shndx > 0 && isym.st_shndx < SHN_LORESERVE) tsec = bfd_section_from_elf_index (ibfd, isym.st_shndx); else if (isym.st_shndx == SHN_ABS) tsec = bfd_abs_section_ptr; else continue; address = (tsec->output_section->vma + tsec->output_offset + isym.st_value); if (address <= 0xffff) { local_plt_offsets[idx] = -1; splt->_cooked_size -= 4; *again = true; } } if (symtab_hdr->contents != extsyms) free (extsyms); } /* If we changed anything, walk the symbols again to reallocate .plt entry addresses. */ if (*again && splt->_cooked_size > 0) { bfd_vma entry = 0; elf_link_hash_traverse (elf_hash_table (info), xstormy16_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; } } } splt->_raw_size = splt->_cooked_size; return true; } static boolean xstormy16_elf_always_size_sections (output_bfd, info) bfd *output_bfd ATTRIBUTE_UNUSED; struct bfd_link_info *info; { bfd *dynobj; asection *splt; if (info->relocateable) return true; dynobj = elf_hash_table (info)->dynobj; if (dynobj == NULL) return true; splt = bfd_get_section_by_name (dynobj, ".plt"); BFD_ASSERT (splt != NULL); splt->contents = (bfd_byte *) bfd_zalloc (dynobj, splt->_raw_size); if (splt->contents == NULL) return false; return true; } /* Relocate an XSTORMY16 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 relocateable 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 relocateable 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 boolean xstormy16_elf_relocate_section (output_bfd, info, input_bfd, input_section, contents, relocs, local_syms, local_sections) 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_section_by_name (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); if ( r_type == R_XSTORMY16_GNU_VTINHERIT || r_type == R_XSTORMY16_GNU_VTENTRY) continue; r_symndx = ELF32_R_SYM (rel->r_info); if (info->relocateable) { /* This is a relocateable link. We don't have to change anything, unless the reloc is against a section symbol, in which case we have to adjust according to where the section symbol winds up in the output section. */ if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) { sec = local_sections [r_symndx]; rel->r_addend += sec->output_offset + sym->st_value; } } continue; } /* This is a final link. */ howto = xstormy16_elf_howto_table + ELF32_R_TYPE (rel->r_info); h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections [r_symndx]; relocation = (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 = (name == NULL) ? 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) { relocation = 0; } else { if (! ((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, input_section, rel->r_offset, true))) return false; relocation = 0; } } switch (ELF32_R_TYPE (rel->r_info)) { case R_XSTORMY16_24: { bfd_vma reloc = relocation + rel->r_addend; unsigned int x; x = bfd_get_32 (input_bfd, contents + rel->r_offset); x &= 0x0000ff00; x |= reloc & 0xff; x |= (reloc << 8) & 0xffff0000; bfd_put_32 (input_bfd, x, contents + rel->r_offset); if (reloc & ~0xffffff) r = bfd_reloc_overflow; else r = bfd_reloc_ok; break; } case R_XSTORMY16_FPTR16: { bfd_vma *plt_offset; if (h != NULL) plt_offset = &h->plt.offset; else plt_offset = elf_local_got_offsets (input_bfd) + r_symndx; 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 = 0x00000200; /* jmpf */ x |= relocation & 0xff; x |= (relocation << 8) & 0xffff0000; bfd_put_32 (input_bfd, x, splt->contents + *plt_offset); *plt_offset |= 1; } relocation = (splt->output_section->vma + splt->output_offset + (*plt_offset & -2)); } r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, 0); break; } default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); break; } if (r != bfd_reloc_ok) { const char * msg = (const char *) NULL; switch (r) { case bfd_reloc_overflow: r = info->callbacks->reloc_overflow (info, 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; } /* This must exist if dynobj is ever set. */ static boolean xstormy16_elf_finish_dynamic_sections (abfd, info) 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_section_by_name (dynobj, ".plt")) != NULL) { bfd_byte *contents = splt->contents; unsigned int i, size = splt->_raw_size; for (i = 0; i < size; i += 4) { unsigned int x = bfd_get_32 (dynobj, contents + i); BFD_ASSERT (x != 0); } } return true; } /* Return the section that should be marked against GC for a given relocation. */ static asection * xstormy16_elf_gc_mark_hook (abfd, info, rel, h, sym) bfd * abfd; struct bfd_link_info * info ATTRIBUTE_UNUSED; Elf_Internal_Rela * rel; struct elf_link_hash_entry * h; Elf_Internal_Sym * sym; { if (h != NULL) { switch (ELF32_R_TYPE (rel->r_info)) { case R_XSTORMY16_GNU_VTINHERIT: case R_XSTORMY16_GNU_VTENTRY: break; default: switch (h->root.type) { case bfd_link_hash_defined: case bfd_link_hash_defweak: return h->root.u.def.section; case bfd_link_hash_common: return h->root.u.c.p->section; default: break; } } } else { if (!(elf_bad_symtab (abfd) && ELF_ST_BIND (sym->st_info) != STB_LOCAL) && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) && sym->st_shndx != SHN_COMMON)) { return bfd_section_from_elf_index (abfd, sym->st_shndx); } } return NULL; } /* Update the got entry reference counts for the section being removed. */ static boolean xstormy16_elf_gc_sweep_hook (abfd, info, sec, relocs) bfd * abfd ATTRIBUTE_UNUSED; struct bfd_link_info * info ATTRIBUTE_UNUSED; asection * sec ATTRIBUTE_UNUSED; const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED; { return true; } #define ELF_ARCH bfd_arch_xstormy16 #define ELF_MACHINE_CODE EM_XSTORMY16 #define ELF_MAXPAGESIZE 0x100 #define TARGET_LITTLE_SYM bfd_elf32_xstormy16_vec #define TARGET_LITTLE_NAME "elf32-xstormy16" #define elf_info_to_howto_rel NULL #define elf_info_to_howto xstormy16_info_to_howto_rela #define elf_backend_relocate_section xstormy16_elf_relocate_section #define elf_backend_gc_mark_hook xstormy16_elf_gc_mark_hook #define elf_backend_gc_sweep_hook xstormy16_elf_gc_sweep_hook #define elf_backend_check_relocs xstormy16_elf_check_relocs #define elf_backend_always_size_sections \ xstormy16_elf_always_size_sections #define elf_backend_finish_dynamic_sections \ xstormy16_elf_finish_dynamic_sections #define elf_backend_can_gc_sections 1 #define bfd_elf32_bfd_reloc_type_lookup xstormy16_reloc_type_lookup #define bfd_elf32_bfd_relax_section xstormy16_elf_relax_section #include "elf32-target.h"