/* 32-bit ELF for the WebAssembly target

   Copyright (C) 2017-2025 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 */

   0,     /* size */

   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 */

   4,     /* size */

   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 bool

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"