1 /* 32-bit ELF for the WebAssembly target
2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
25 #include "bfd_stdint.h"
26 #include "libiberty.h"
27 #include "elf/wasm32.h"
29 static reloc_howto_type elf32_wasm32_howto_table[] =
31 HOWTO (R_WASM32_NONE, /* type */
33 3, /* size (0 = byte, 1 = short, 2 = long) */
35 FALSE, /* pc_relative */
37 complain_overflow_dont,/* complain_on_overflow */
38 bfd_elf_generic_reloc, /* special_function */
39 "R_WASM32_NONE", /* name */
40 FALSE, /* partial_inplace */
43 FALSE), /* pcrel_offset */
46 HOWTO (R_WASM32_32, /* type */
48 2, /* size (0 = byte, 1 = short, 2 = long) */
50 FALSE, /* pc_relative */
52 complain_overflow_bitfield,/* complain_on_overflow */
53 bfd_elf_generic_reloc, /* special_function */
54 "R_WASM32_32", /* name */
55 FALSE, /* partial_inplace */
56 0xffffffff, /* src_mask */
57 0xffffffff, /* dst_mask */
58 FALSE), /* pcrel_offset */
61 /* Look up the relocation CODE. */
63 static reloc_howto_type *
64 elf32_wasm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
65 bfd_reloc_code_real_type code)
70 return &elf32_wasm32_howto_table[R_WASM32_NONE];
72 return &elf32_wasm32_howto_table[R_WASM32_32];
80 /* Look up the relocation R_NAME. */
82 static reloc_howto_type *
83 elf32_wasm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
88 for (i = 0; i < ARRAY_SIZE (elf32_wasm32_howto_table); i++)
89 if (elf32_wasm32_howto_table[i].name != NULL
90 && strcasecmp (elf32_wasm32_howto_table[i].name, r_name) == 0)
91 return &elf32_wasm32_howto_table[i];
96 /* Look up the relocation R_TYPE. */
98 static reloc_howto_type *
99 elf32_wasm32_rtype_to_howto (bfd *abfd, unsigned r_type)
101 unsigned int i = r_type;
103 if (i >= ARRAY_SIZE (elf32_wasm32_howto_table))
105 /* xgettext:c-format */
106 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
111 if (elf32_wasm32_howto_table[i].type != r_type)
114 return &elf32_wasm32_howto_table[i];
117 /* Translate the ELF-internal relocation RELA into CACHE_PTR. */
120 elf32_wasm32_info_to_howto_rela (bfd *abfd,
122 Elf_Internal_Rela *dst)
124 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
125 cache_ptr->howto = elf32_wasm32_rtype_to_howto (abfd, r_type);
128 #define ELF_ARCH bfd_arch_wasm32
129 #define ELF_TARGET_ID EM_WEBASSEMBLY
130 #define ELF_MACHINE_CODE EM_WEBASSEMBLY
131 /* FIXME we don't have paged executables, see:
132 https://github.com/pipcet/binutils-gdb/issues/4 */
133 #define ELF_MAXPAGESIZE 4096
135 #define TARGET_LITTLE_SYM wasm32_elf32_vec
136 #define TARGET_LITTLE_NAME "elf32-wasm32"
138 #define elf_backend_can_gc_sections 1
139 #define elf_backend_rela_normal 1
141 #define elf_backend_want_dynrelro 1
143 #define elf_info_to_howto elf32_wasm32_info_to_howto_rela
144 #define elf_info_to_howto_rel NULL
146 #define bfd_elf32_bfd_reloc_type_lookup elf32_wasm32_reloc_type_lookup
147 #define bfd_elf32_bfd_reloc_name_lookup elf32_wasm32_reloc_name_lookup
149 #define ELF_DYNAMIC_INTERPRETER "/sbin/elf-dynamic-interpreter.so"
151 #define elf_backend_want_got_plt 1
152 #define elf_backend_plt_readonly 1
153 #define elf_backend_got_header_size 0
155 #include "elf32-target.h"