diff options
author | Geoffrey Keating <geoffk@geoffk.org> | 2001-12-08 03:46:03 +0000 |
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committer | Geoffrey Keating <geoffk@geoffk.org> | 2001-12-08 03:46:03 +0000 |
commit | 93fbbb04b887de8b1e56bf3de66581082d2b0e8b (patch) | |
tree | b4692062975e5a14495c81b43fcaa78b02d859fb /bfd/elf32-xstormy16.c | |
parent | 4b2c32f8e9216d637ef7f5a39e2f4afe0aae41af (diff) | |
download | gdb-93fbbb04b887de8b1e56bf3de66581082d2b0e8b.zip gdb-93fbbb04b887de8b1e56bf3de66581082d2b0e8b.tar.gz gdb-93fbbb04b887de8b1e56bf3de66581082d2b0e8b.tar.bz2 |
Index: bfd/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
Richard Henderson <rth@redhat.com>
Corinna Vinschen <vinschen@redhat.com>
* Makefile.am: Add support for xstormy16.
* archures.c: Add support for xstormy16.
* config.bfd: Add support for xstormy16.
* configure.in: Add support for xstormy16.
* reloc.c: Add support for xstormy16.
* targets.c: Add support for xstormy16.
* cpu-xstormy16.c: New file.
* elf32-xstormy16.c: New file.
* Makefile.in: Regenerated.
* bfd-in2.h: Regenerated.
* configure: Regenerated.
* libbfd.h: Regenerated.
Index: binutils/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
* readelf.c (guess_is_rela): Add support for stormy16.
(dump_relocations): Likewise.
(get_machine_name): Likewise.
Index: gas/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
Richard Henderson <rth@redhat.com>
* configure.in: Add support for xstormy16.
* configure: Regenerated.
* Makefile.am: Add support for xstormy16.
* Makefile.in: Regenerated.
* config/tc-xstormy16.c: New file.
* config/tc-xstormy16.h: New file.
Index: gas/testsuite/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
matthew green <mrg@redhat.com>
* gas/xstormy16/allinsn.d: New file.
* gas/xstormy16/allinsn.exp: New file.
* gas/xstormy16/allinsn.s: New file.
* gas/xstormy16/allinsn.sh: New file.
* gas/xstormy16/gcc.d: New file.
* gas/xstormy16/gcc.s: New file.
* gas/xstormy16/gcc.sh: New file.
* gas/xstormy16/reloc-1.d: New file.
* gas/xstormy16/reloc-1.s: New file.
* gas/xstormy16/reloc-2.d: New file.
* gas/xstormy16/reloc-2.s: New file.
Index: ld/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
Richard Henderson <rth@redhat.com>
* Makefile.am: Add support for xstormy16.
* configure.tgt: Add support for xstormy16.
* Makefile.in: Regenerate.
* emulparams/elf32xstormy16.sh: New file.
* scripttempl/xstormy16.sc: New file.
Index: opcodes/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
* Makefile.am: Add support for xstormy16.
* Makefile.in: Regenerate.
* configure.in: Add support for xstormy16.
* configure: Regenerate.
* disassemble.c: Add support for xstormy16.
* xstormy16-asm.c: New generated file.
* xstormy16-desc.c: New generated file.
* xstormy16-desc.h: New generated file.
* xstormy16-dis.c: New generated file.
* xstormy16-ibld.c: New generated file.
* xstormy16-opc.c: New generated file.
* xstormy16-opc.h: New generated file.
Index: include/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
* dis-asm.h (print_insn_xstormy16): Declare.
Index: include/elf/ChangeLog
2001-12-07 Geoffrey Keating <geoffk@redhat.com>
Richard Henderson <rth@redhat.com>
* common.h (EM_XSTORMY16): Define.
* xstormy16.h: New file.
Diffstat (limited to 'bfd/elf32-xstormy16.c')
-rw-r--r-- | bfd/elf32-xstormy16.c | 1074 |
1 files changed, 1074 insertions, 0 deletions
diff --git a/bfd/elf32-xstormy16.c b/bfd/elf32-xstormy16.c new file mode 100644 index 0000000..5be799e --- /dev/null +++ b/bfd/elf32-xstormy16.c @@ -0,0 +1,1074 @@ +/* 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" |