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/* 32-bit ELF for the WebAssembly target
Copyright (C) 2017-2020 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 3 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., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "libiberty.h"
#include "elf/wasm32.h"
static reloc_howto_type elf32_wasm32_howto_table[] =
{
HOWTO (R_WASM32_NONE, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_WASM32_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* 32 bit absolute */
HOWTO (R_WASM32_32, /* 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_WASM32_32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
};
/* Look up the relocation CODE. */
static reloc_howto_type *
elf32_wasm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
switch (code)
{
case BFD_RELOC_NONE:
return &elf32_wasm32_howto_table[R_WASM32_NONE];
case BFD_RELOC_32:
return &elf32_wasm32_howto_table[R_WASM32_32];
default:
break;
}
return NULL;
}
/* Look up the relocation R_NAME. */
static reloc_howto_type *
elf32_wasm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE (elf32_wasm32_howto_table); i++)
if (elf32_wasm32_howto_table[i].name != NULL
&& strcasecmp (elf32_wasm32_howto_table[i].name, r_name) == 0)
return &elf32_wasm32_howto_table[i];
return NULL;
}
/* Look up the relocation R_TYPE. */
static reloc_howto_type *
elf32_wasm32_rtype_to_howto (bfd *abfd, unsigned r_type)
{
unsigned int i = r_type;
if (i >= ARRAY_SIZE (elf32_wasm32_howto_table))
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
if (elf32_wasm32_howto_table[i].type != r_type)
return NULL;
return elf32_wasm32_howto_table + i;
}
/* Translate the ELF-internal relocation RELA into CACHE_PTR. */
static bfd_boolean
elf32_wasm32_info_to_howto_rela (bfd *abfd,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
cache_ptr->howto = elf32_wasm32_rtype_to_howto (abfd, r_type);
return cache_ptr->howto != NULL;
}
#define ELF_ARCH bfd_arch_wasm32
#define ELF_TARGET_ID EM_WEBASSEMBLY
#define ELF_MACHINE_CODE EM_WEBASSEMBLY
/* FIXME we don't have paged executables, see:
https://github.com/pipcet/binutils-gdb/issues/4 */
#define ELF_MAXPAGESIZE 4096
#define TARGET_LITTLE_SYM wasm32_elf32_vec
#define TARGET_LITTLE_NAME "elf32-wasm32"
#define elf_backend_can_gc_sections 1
#define elf_backend_rela_normal 1
/* For testing. */
#define elf_backend_want_dynrelro 1
#define elf_info_to_howto elf32_wasm32_info_to_howto_rela
#define elf_info_to_howto_rel NULL
#define bfd_elf32_bfd_reloc_type_lookup elf32_wasm32_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup elf32_wasm32_reloc_name_lookup
#define ELF_DYNAMIC_INTERPRETER "/sbin/elf-dynamic-interpreter.so"
#define elf_backend_want_got_plt 1
#define elf_backend_plt_readonly 1
#define elf_backend_got_header_size 0
#include "elf32-target.h"
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