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8fb740dd | 1 | /* 32-bit ELF for the WebAssembly target |
219d1afa | 2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
8fb740dd PC |
3 | |
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd.h" | |
23 | #include "libbfd.h" | |
24 | #include "elf-bfd.h" | |
25 | #include "bfd_stdint.h" | |
f96bd6c2 | 26 | #include "libiberty.h" |
8fb740dd PC |
27 | #include "elf/wasm32.h" |
28 | ||
f96bd6c2 PC |
29 | static reloc_howto_type elf32_wasm32_howto_table[] = |
30 | { | |
31 | HOWTO (R_WASM32_NONE, /* type */ | |
07d6d2b8 AM |
32 | 0, /* rightshift */ |
33 | 3, /* size (0 = byte, 1 = short, 2 = long) */ | |
34 | 0, /* bitsize */ | |
35 | FALSE, /* pc_relative */ | |
36 | 0, /* bitpos */ | |
37 | complain_overflow_dont,/* complain_on_overflow */ | |
38 | bfd_elf_generic_reloc, /* special_function */ | |
39 | "R_WASM32_NONE", /* name */ | |
40 | FALSE, /* partial_inplace */ | |
41 | 0, /* src_mask */ | |
42 | 0, /* dst_mask */ | |
43 | FALSE), /* pcrel_offset */ | |
f96bd6c2 PC |
44 | |
45 | /* 32 bit absolute */ | |
46 | HOWTO (R_WASM32_32, /* type */ | |
07d6d2b8 AM |
47 | 0, /* rightshift */ |
48 | 2, /* size (0 = byte, 1 = short, 2 = long) */ | |
49 | 32, /* bitsize */ | |
50 | FALSE, /* pc_relative */ | |
51 | 0, /* bitpos */ | |
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 */ | |
f96bd6c2 PC |
59 | }; |
60 | ||
61 | /* Look up the relocation CODE. */ | |
62 | ||
63 | static reloc_howto_type * | |
64 | elf32_wasm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
07d6d2b8 | 65 | bfd_reloc_code_real_type code) |
f96bd6c2 PC |
66 | { |
67 | switch (code) | |
68 | { | |
69 | case BFD_RELOC_NONE: | |
70 | return &elf32_wasm32_howto_table[R_WASM32_NONE]; | |
71 | case BFD_RELOC_32: | |
72 | return &elf32_wasm32_howto_table[R_WASM32_32]; | |
73 | default: | |
74 | break; | |
75 | } | |
76 | ||
77 | return NULL; | |
78 | } | |
79 | ||
80 | /* Look up the relocation R_NAME. */ | |
81 | ||
82 | static reloc_howto_type * | |
83 | elf32_wasm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, | |
07d6d2b8 | 84 | const char *r_name) |
f96bd6c2 PC |
85 | { |
86 | unsigned int i; | |
87 | ||
88 | for (i = 0; i < ARRAY_SIZE (elf32_wasm32_howto_table); i++) | |
89 | if (elf32_wasm32_howto_table[i].name != NULL | |
07d6d2b8 | 90 | && strcasecmp (elf32_wasm32_howto_table[i].name, r_name) == 0) |
f96bd6c2 PC |
91 | return &elf32_wasm32_howto_table[i]; |
92 | ||
93 | return NULL; | |
94 | } | |
95 | ||
96 | /* Look up the relocation R_TYPE. */ | |
97 | ||
98 | static reloc_howto_type * | |
99 | elf32_wasm32_rtype_to_howto (bfd *abfd, unsigned r_type) | |
100 | { | |
101 | unsigned int i = r_type; | |
102 | ||
103 | if (i >= ARRAY_SIZE (elf32_wasm32_howto_table)) | |
104 | { | |
105 | /* xgettext:c-format */ | |
871b3ab2 | 106 | _bfd_error_handler (_("%pB: invalid relocation type %d"), |
f96bd6c2 PC |
107 | abfd, (int) r_type); |
108 | i = R_WASM32_NONE; | |
109 | } | |
110 | ||
111 | if (elf32_wasm32_howto_table[i].type != r_type) | |
112 | return NULL; | |
113 | ||
114 | return &elf32_wasm32_howto_table[i]; | |
115 | } | |
116 | ||
117 | /* Translate the ELF-internal relocation RELA into CACHE_PTR. */ | |
118 | ||
119 | static void | |
120 | elf32_wasm32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, | |
07d6d2b8 AM |
121 | arelent *cache_ptr, |
122 | Elf_Internal_Rela *dst) | |
f96bd6c2 PC |
123 | { |
124 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); | |
125 | cache_ptr->howto = elf32_wasm32_rtype_to_howto (abfd, r_type); | |
126 | } | |
127 | ||
8fb740dd PC |
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 | |
134 | ||
07d6d2b8 | 135 | #define TARGET_LITTLE_SYM wasm32_elf32_vec |
8fb740dd PC |
136 | #define TARGET_LITTLE_NAME "elf32-wasm32" |
137 | ||
07d6d2b8 AM |
138 | #define elf_backend_can_gc_sections 1 |
139 | #define elf_backend_rela_normal 1 | |
8fb740dd | 140 | /* For testing. */ |
07d6d2b8 | 141 | #define elf_backend_want_dynrelro 1 |
8fb740dd | 142 | |
f96bd6c2 PC |
143 | #define elf_info_to_howto elf32_wasm32_info_to_howto_rela |
144 | #define elf_info_to_howto_rel NULL | |
145 | ||
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 | |
8fb740dd | 148 | |
07d6d2b8 | 149 | #define ELF_DYNAMIC_INTERPRETER "/sbin/elf-dynamic-interpreter.so" |
8fb740dd | 150 | |
07d6d2b8 AM |
151 | #define elf_backend_want_got_plt 1 |
152 | #define elf_backend_plt_readonly 1 | |
153 | #define elf_backend_got_header_size 0 | |
8fb740dd PC |
154 | |
155 | #include "elf32-target.h" |