156 lines
4.7 KiB
C
156 lines
4.7 KiB
C
/* 32-bit ELF for the WebAssembly target
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "bfd_stdint.h"
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#include "libiberty.h"
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#include "elf/wasm32.h"
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static reloc_howto_type elf32_wasm32_howto_table[] =
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{
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HOWTO (R_WASM32_NONE, /* type */
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0, /* rightshift */
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3, /* size (0 = byte, 1 = short, 2 = long) */
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0, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_WASM32_NONE", /* name */
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FALSE, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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FALSE), /* pcrel_offset */
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/* 32 bit absolute */
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HOWTO (R_WASM32_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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FALSE, /* pc_relative */
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0, /* bitpos */
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complain_overflow_bitfield,/* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_WASM32_32", /* name */
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FALSE, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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FALSE), /* pcrel_offset */
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};
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/* Look up the relocation CODE. */
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static reloc_howto_type *
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elf32_wasm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_reloc_code_real_type code)
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{
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switch (code)
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{
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case BFD_RELOC_NONE:
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return &elf32_wasm32_howto_table[R_WASM32_NONE];
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case BFD_RELOC_32:
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return &elf32_wasm32_howto_table[R_WASM32_32];
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default:
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break;
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}
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return NULL;
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}
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/* Look up the relocation R_NAME. */
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static reloc_howto_type *
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elf32_wasm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
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const char *r_name)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE (elf32_wasm32_howto_table); i++)
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if (elf32_wasm32_howto_table[i].name != NULL
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&& strcasecmp (elf32_wasm32_howto_table[i].name, r_name) == 0)
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return &elf32_wasm32_howto_table[i];
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return NULL;
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}
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/* Look up the relocation R_TYPE. */
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static reloc_howto_type *
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elf32_wasm32_rtype_to_howto (bfd *abfd, unsigned r_type)
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{
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unsigned int i = r_type;
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if (i >= ARRAY_SIZE (elf32_wasm32_howto_table))
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%B: invalid relocation type %d"),
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abfd, (int) r_type);
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i = R_WASM32_NONE;
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}
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if (elf32_wasm32_howto_table[i].type != r_type)
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return NULL;
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return &elf32_wasm32_howto_table[i];
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}
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/* Translate the ELF-internal relocation RELA into CACHE_PTR. */
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static void
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elf32_wasm32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
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arelent *cache_ptr,
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Elf_Internal_Rela *dst)
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{
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unsigned int r_type = ELF32_R_TYPE (dst->r_info);
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cache_ptr->howto = elf32_wasm32_rtype_to_howto (abfd, r_type);
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}
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#define ELF_ARCH bfd_arch_wasm32
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#define ELF_TARGET_ID EM_WEBASSEMBLY
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#define ELF_MACHINE_CODE EM_WEBASSEMBLY
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/* FIXME we don't have paged executables, see:
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https://github.com/pipcet/binutils-gdb/issues/4 */
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#define ELF_MAXPAGESIZE 4096
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#define TARGET_LITTLE_SYM wasm32_elf32_vec
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#define TARGET_LITTLE_NAME "elf32-wasm32"
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#define elf_backend_can_gc_sections 1
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#define elf_backend_rela_normal 1
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/* For testing. */
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#define elf_backend_want_dynrelro 1
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#define elf_info_to_howto elf32_wasm32_info_to_howto_rela
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#define elf_info_to_howto_rel NULL
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#define bfd_elf32_bfd_reloc_type_lookup elf32_wasm32_reloc_type_lookup
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#define bfd_elf32_bfd_reloc_name_lookup elf32_wasm32_reloc_name_lookup
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#define ELF_DYNAMIC_INTERPRETER "/sbin/elf-dynamic-interpreter.so"
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#define elf_backend_want_got_plt 1
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#define elf_backend_plt_readonly 1
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#define elf_backend_got_header_size 0
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#include "elf32-target.h"
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