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/* PEF support for BFD.

   Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

   2009, 2011  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 "safe-ctype.h"

#include "pef.h"

#include "pef-traceback.h"

#include "bfd.h"

#include "libbfd.h"

#include "libiberty.h"

#ifndef BFD_IO_FUNCS

#define BFD_IO_FUNCS 0

#endif

#define bfd_pef_close_and_cleanup                   _bfd_generic_close_and_cleanup

#define bfd_pef_bfd_free_cached_info                _bfd_generic_bfd_free_cached_info

#define bfd_pef_new_section_hook                    _bfd_generic_new_section_hook

#define bfd_pef_bfd_is_local_label_name             bfd_generic_is_local_label_name

#define bfd_pef_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)

#define bfd_pef_get_lineno                          _bfd_nosymbols_get_lineno

#define bfd_pef_find_nearest_line                   _bfd_nosymbols_find_nearest_line

#define bfd_pef_find_inliner_info                   _bfd_nosymbols_find_inliner_info

#define bfd_pef_bfd_make_debug_symbol               _bfd_nosymbols_bfd_make_debug_symbol

#define bfd_pef_read_minisymbols                    _bfd_generic_read_minisymbols

#define bfd_pef_minisymbol_to_symbol                _bfd_generic_minisymbol_to_symbol

#define bfd_pef_set_arch_mach                       _bfd_generic_set_arch_mach

#define bfd_pef_get_section_contents                _bfd_generic_get_section_contents

#define bfd_pef_set_section_contents                _bfd_generic_set_section_contents

#define bfd_pef_bfd_get_relocated_section_contents  bfd_generic_get_relocated_section_contents

#define bfd_pef_bfd_relax_section                   bfd_generic_relax_section

#define bfd_pef_bfd_gc_sections                     bfd_generic_gc_sections

#define bfd_pef_bfd_lookup_section_flags            bfd_generic_lookup_section_flags

#define bfd_pef_bfd_merge_sections                  bfd_generic_merge_sections

#define bfd_pef_bfd_is_group_section                bfd_generic_is_group_section

#define bfd_pef_bfd_discard_group                   bfd_generic_discard_group

#define bfd_pef_section_already_linked              _bfd_generic_section_already_linked

#define bfd_pef_bfd_define_common_symbol            bfd_generic_define_common_symbol

#define bfd_pef_bfd_link_hash_table_create          _bfd_generic_link_hash_table_create

#define bfd_pef_bfd_link_hash_table_free            _bfd_generic_link_hash_table_free

#define bfd_pef_bfd_link_add_symbols                _bfd_generic_link_add_symbols

#define bfd_pef_bfd_link_just_syms                  _bfd_generic_link_just_syms

#define bfd_pef_bfd_copy_link_hash_symbol_type \

  _bfd_generic_copy_link_hash_symbol_type

#define bfd_pef_bfd_final_link                      _bfd_generic_final_link

#define bfd_pef_bfd_link_split_section              _bfd_generic_link_split_section

#define bfd_pef_get_section_contents_in_window      _bfd_generic_get_section_contents_in_window

static int

bfd_pef_parse_traceback_table (bfd *abfd,

                               asection *section,

                               unsigned char *buf,

                               size_t len,

                               size_t pos,

                               asymbol *sym,

                               FILE *file)

{

  struct traceback_table table;

  size_t offset;

  const char *s;

  asymbol tmpsymbol;

  if (sym == NULL)

    sym = & tmpsymbol;

  sym->name = NULL;

  sym->value = 0;

  sym->the_bfd = abfd;

  sym->section = section;

  sym->flags = 0;

  sym->udata.i = 0;

  /* memcpy is fine since all fields are unsigned char.  */

  if ((pos + 8) > len)

    return -1;

  memcpy (&table, buf + pos, 8);

  /* Calling code relies on returned symbols having a name and

     correct offset.  */

  if ((table.lang != TB_C) && (table.lang != TB_CPLUSPLUS))

    return -1;

  if (! (table.flags2 & TB_NAME_PRESENT))

    return -1;

  if (! (table.flags1 & TB_HAS_TBOFF))

    return -1;

  offset = 8;

  if ((table.flags5 & TB_FLOATPARAMS) || (table.fixedparams))

    offset += 4;

  if (table.flags1 & TB_HAS_TBOFF)

    {

      struct traceback_table_tboff off;

      if ((pos + offset + 4) > len)

        return -1;

      off.tb_offset = bfd_getb32 (buf + pos + offset);

      offset += 4;

      /* Need to subtract 4 because the offset includes the 0x0L

         preceding the table.  */

      if (file != NULL)

        fprintf (file, " [offset = 0x%lx]", off.tb_offset);

      if ((file == NULL) && ((off.tb_offset + 4) > (pos + offset)))

        return -1;

      sym->value = pos - off.tb_offset - 4;

    }

  if (table.flags2 & TB_INT_HNDL)

    offset += 4;

  if (table.flags1 & TB_HAS_CTL)

    {

      struct traceback_table_anchors anchors;

      if ((pos + offset + 4) > len)

        return -1;

      anchors.ctl_info = bfd_getb32 (buf + pos + offset);

      offset += 4;

      if (anchors.ctl_info > 1024)

        return -1;

      offset += anchors.ctl_info * 4;

    }

  if (table.flags2 & TB_NAME_PRESENT)

    {

      struct traceback_table_routine name;

      char *namebuf;

      if ((pos + offset + 2) > len)

        return -1;

      name.name_len = bfd_getb16 (buf + pos + offset);

      offset += 2;

      if (name.name_len > 4096)

        return -1;

      if ((pos + offset + name.name_len) > len)

        return -1;

      namebuf = bfd_alloc (abfd, name.name_len + 1);

      if (namebuf == NULL)

        return -1;

      memcpy (namebuf, buf + pos + offset, name.name_len);

      namebuf[name.name_len] = '\0';

      /* Strip leading period inserted by compiler.  */

      if (namebuf[0] == '.')

        memmove (namebuf, namebuf + 1, name.name_len + 1);

      sym->name = namebuf;

      for (s = sym->name; (*s != '\0'); s++)

        if (! ISPRINT (*s))

          return -1;

      offset += name.name_len;

    }

  if (table.flags2 & TB_USES_ALLOCA)

    offset += 4;

  if (table.flags4 & TB_HAS_VEC_INFO)

    offset += 4;

  if (file != NULL)

    fprintf (file, " [length = 0x%lx]", (unsigned long) offset);

  return offset;

}

static void

bfd_pef_print_symbol (bfd *abfd,

                      void * afile,

                      asymbol *symbol,

                      bfd_print_symbol_type how)

{

  FILE *file = (FILE *) afile;

  switch (how)

    {

    case bfd_print_symbol_name:

      fprintf (file, "%s", symbol->name);

      break;

    default:

      bfd_print_symbol_vandf (abfd, (void *) file, symbol);

      fprintf (file, " %-5s %s", symbol->section->name, symbol->name);

      if (CONST_STRNEQ (symbol->name, "__traceback_"))

        {

          unsigned char *buf = alloca (symbol->udata.i);

          size_t offset = symbol->value + 4;

          size_t len = symbol->udata.i;

          int ret;

          bfd_get_section_contents (abfd, symbol->section, buf, offset, len);

          ret = bfd_pef_parse_traceback_table (abfd, symbol->section, buf,

                                               len, 0, NULL, file);

          if (ret < 0)

            fprintf (file, " [ERROR]");

        }

    }

}

static void

bfd_pef_convert_architecture (unsigned long architecture,

                              enum bfd_architecture *type,

                              unsigned long *subtype)

{

  const unsigned long ARCH_POWERPC = 0x70777063; /* 'pwpc'.  */

  const unsigned long ARCH_M68K = 0x6d36386b; /* 'm68k'.  */

  *subtype = bfd_arch_unknown;

  *type = bfd_arch_unknown;

  if (architecture == ARCH_POWERPC)

    *type = bfd_arch_powerpc;

  else if (architecture == ARCH_M68K)

    *type = bfd_arch_m68k;

}

static bfd_boolean

bfd_pef_mkobject (bfd *abfd ATTRIBUTE_UNUSED)

{

  return TRUE;

}

static const char *bfd_pef_section_name (bfd_pef_section *section)

{

  switch (section->section_kind)

    {

    case BFD_PEF_SECTION_CODE: return "code";

    case BFD_PEF_SECTION_UNPACKED_DATA: return "unpacked-data";

    case BFD_PEF_SECTION_PACKED_DATA: return "packed-data";

    case BFD_PEF_SECTION_CONSTANT: return "constant";

    case BFD_PEF_SECTION_LOADER: return "loader";

    case BFD_PEF_SECTION_DEBUG: return "debug";

    case BFD_PEF_SECTION_EXEC_DATA: return "exec-data";

    case BFD_PEF_SECTION_EXCEPTION: return "exception";

    case BFD_PEF_SECTION_TRACEBACK: return "traceback";

    default: return "unknown";

    }

}

static unsigned long bfd_pef_section_flags (bfd_pef_section *section)

{

  switch (section->section_kind)

    {

    case BFD_PEF_SECTION_CODE:

      return SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC | SEC_CODE;

    case BFD_PEF_SECTION_UNPACKED_DATA:

    case BFD_PEF_SECTION_PACKED_DATA:

    case BFD_PEF_SECTION_CONSTANT:

    case BFD_PEF_SECTION_LOADER:

    case BFD_PEF_SECTION_DEBUG:

    case BFD_PEF_SECTION_EXEC_DATA:

    case BFD_PEF_SECTION_EXCEPTION:

    case BFD_PEF_SECTION_TRACEBACK:

    default:

      return SEC_HAS_CONTENTS | SEC_LOAD | SEC_ALLOC;

    }

}

static asection *

bfd_pef_make_bfd_section (bfd *abfd, bfd_pef_section *section)

{

  asection *bfdsec;

  const char *name = bfd_pef_section_name (section);

  bfdsec = bfd_make_section_anyway (abfd, name);

  if (bfdsec == NULL)

    return NULL;

  bfdsec->vma = section->default_address + section->container_offset;

  bfdsec->lma = section->default_address + section->container_offset;

  bfdsec->size = section->container_length;

  bfdsec->filepos = section->container_offset;

  bfdsec->alignment_power = section->alignment;

  bfdsec->flags = bfd_pef_section_flags (section);

  return bfdsec;

}

int

bfd_pef_parse_loader_header (bfd *abfd ATTRIBUTE_UNUSED,

                             unsigned char *buf,

                             size_t len,

                             bfd_pef_loader_header *header)

{

  BFD_ASSERT (len == 56);

  header->main_section = bfd_getb32 (buf);

  header->main_offset = bfd_getb32 (buf + 4);

  header->init_section = bfd_getb32 (buf + 8);

  header->init_offset = bfd_getb32 (buf + 12);

  header->term_section = bfd_getb32 (buf + 16);

  header->term_offset = bfd_getb32 (buf + 20);

  header->imported_library_count = bfd_getb32 (buf + 24);

  header->total_imported_symbol_count = bfd_getb32 (buf + 28);

  header->reloc_section_count = bfd_getb32 (buf + 32);

  header->reloc_instr_offset = bfd_getb32 (buf + 36);

  header->loader_strings_offset = bfd_getb32 (buf + 40);

  header->export_hash_offset = bfd_getb32 (buf + 44);

  header->export_hash_table_power = bfd_getb32 (buf + 48);

  header->exported_symbol_count = bfd_getb32 (buf + 52);

  return 0;

}

int

bfd_pef_parse_imported_library (bfd *abfd ATTRIBUTE_UNUSED,

                                unsigned char *buf,

                                size_t len,

                                bfd_pef_imported_library *header)

{

  BFD_ASSERT (len == 24);

  header->name_offset = bfd_getb32 (buf);

  header->old_implementation_version = bfd_getb32 (buf + 4);

  header->current_version = bfd_getb32 (buf + 8);

  header->imported_symbol_count = bfd_getb32 (buf + 12);

  header->first_imported_symbol = bfd_getb32 (buf + 16);

  header->options = buf[20];

  header->reserved_a = buf[21];

  header->reserved_b = bfd_getb16 (buf + 22);

  return 0;

}

int

bfd_pef_parse_imported_symbol (bfd *abfd ATTRIBUTE_UNUSED,

                               unsigned char *buf,

                               size_t len,

                               bfd_pef_imported_symbol *symbol)

{

  unsigned long value;

  BFD_ASSERT (len == 4);

  value = bfd_getb32 (buf);

  symbol->symbol_class = value >> 24;

  symbol->name = value & 0x00ffffff;

  return 0;

}

int

bfd_pef_scan_section (bfd *abfd, bfd_pef_section *section)

{

  unsigned char buf[28];

  bfd_seek (abfd, section->header_offset, SEEK_SET);

  if (bfd_bread ((void *) buf, 28, abfd) != 28)

    return -1;

  section->name_offset = bfd_h_get_32 (abfd, buf);

  section->default_address = bfd_h_get_32 (abfd, buf + 4);

  section->total_length = bfd_h_get_32 (abfd, buf + 8);

  section->unpacked_length = bfd_h_get_32 (abfd, buf + 12);

  section->container_length = bfd_h_get_32 (abfd, buf + 16);

  section->container_offset = bfd_h_get_32 (abfd, buf + 20);

  section->section_kind = buf[24];

  section->share_kind = buf[25];

  section->alignment = buf[26];

  section->reserved = buf[27];

  section->bfd_section = bfd_pef_make_bfd_section (abfd, section);

  if (section->bfd_section == NULL)

    return -1;

  return 0;

}

void

bfd_pef_print_loader_header (bfd *abfd ATTRIBUTE_UNUSED,

                             bfd_pef_loader_header *header,

                             FILE *file)

{

  fprintf (file, "main_section: %ld\n", header->main_section);

  fprintf (file, "main_offset: %lu\n", header->main_offset);

  fprintf (file, "init_section: %ld\n", header->init_section);

  fprintf (file, "init_offset: %lu\n", header->init_offset);

  fprintf (file, "term_section: %ld\n", header->term_section);

  fprintf (file, "term_offset: %lu\n", header->term_offset);

  fprintf (file, "imported_library_count: %lu\n",

           header->imported_library_count);

  fprintf (file, "total_imported_symbol_count: %lu\n",

           header->total_imported_symbol_count);

  fprintf (file, "reloc_section_count: %lu\n", header->reloc_section_count);

  fprintf (file, "reloc_instr_offset: %lu\n", header->reloc_instr_offset);

  fprintf (file, "loader_strings_offset: %lu\n",

           header->loader_strings_offset);

  fprintf (file, "export_hash_offset: %lu\n", header->export_hash_offset);

  fprintf (file, "export_hash_table_power: %lu\n",

           header->export_hash_table_power);

  fprintf (file, "exported_symbol_count: %lu\n",

           header->exported_symbol_count);

}

int

bfd_pef_print_loader_section (bfd *abfd, FILE *file)

{

  bfd_pef_loader_header header;

  asection *loadersec = NULL;

  unsigned char *loaderbuf = NULL;

  size_t loaderlen = 0;

  loadersec = bfd_get_section_by_name (abfd, "loader");

  if (loadersec == NULL)

    return -1;

  loaderlen = loadersec->size;

  loaderbuf = bfd_malloc (loaderlen);

  if (bfd_seek (abfd, loadersec->filepos, SEEK_SET) < 0

      || bfd_bread ((void *) loaderbuf, loaderlen, abfd) != loaderlen

      || loaderlen < 56

      || bfd_pef_parse_loader_header (abfd, loaderbuf, 56, &header) < 0)

    {

      free (loaderbuf);

      return -1;

    }

  bfd_pef_print_loader_header (abfd, &header, file);

  return 0;

}

int

bfd_pef_scan_start_address (bfd *abfd)

{

  bfd_pef_loader_header header;

  asection *section;

  asection *loadersec = NULL;

  unsigned char *loaderbuf = NULL;

  size_t loaderlen = 0;

  int ret;

  loadersec = bfd_get_section_by_name (abfd, "loader");

  if (loadersec == NULL)

    goto end;

  loaderlen = loadersec->size;

  loaderbuf = bfd_malloc (loaderlen);

  if (bfd_seek (abfd, loadersec->filepos, SEEK_SET) < 0)

    goto error;

  if (bfd_bread ((void *) loaderbuf, loaderlen, abfd) != loaderlen)

    goto error;

  if (loaderlen < 56)

    goto error;

  ret = bfd_pef_parse_loader_header (abfd, loaderbuf, 56, &header);

  if (ret < 0)

    goto error;

  if (header.main_section < 0)

    goto end;

  for (section = abfd->sections; section != NULL; section = section->next)

    if ((section->index + 1) == header.main_section)

      break;

  if (section == NULL)

    goto error;

  abfd->start_address = section->vma + header.main_offset;

 end:

  if (loaderbuf != NULL)

    free (loaderbuf);

  return 0;

 error:

  if (loaderbuf != NULL)

    free (loaderbuf);

  return -1;

}

int

bfd_pef_scan (abfd, header, mdata)

     bfd *abfd;

     bfd_pef_header *header;

     bfd_pef_data_struct *mdata;

{

  unsigned int i;

  enum bfd_architecture cputype;

  unsigned long cpusubtype;

  mdata->header = *header;

  bfd_pef_convert_architecture (header->architecture, &cputype, &cpusubtype);

  if (cputype == bfd_arch_unknown)

    {

      (*_bfd_error_handler) (_("bfd_pef_scan: unknown architecture 0x%lx"),

                               header->architecture);

      return -1;

    }

  bfd_set_arch_mach (abfd, cputype, cpusubtype);

  mdata->header = *header;

  abfd->flags = (abfd->xvec->object_flags

                 | (abfd->flags & (BFD_IN_MEMORY | BFD_IO_FUNCS)));

  if (header->section_count != 0)

    {

      mdata->sections = bfd_alloc (abfd, header->section_count * sizeof (bfd_pef_section));

      if (mdata->sections == NULL)

        return -1;

      for (i = 0; i < header->section_count; i++)

        {

          bfd_pef_section *cur = &mdata->sections[i];

          cur->header_offset = 40 + (i * 28);

          if (bfd_pef_scan_section (abfd, cur) < 0)

            return -1;

        }

    }

  if (bfd_pef_scan_start_address (abfd) < 0)

    return -1;

  abfd->tdata.pef_data = mdata;

  return 0;

}

static int

bfd_pef_read_header (bfd *abfd, bfd_pef_header *header)

{

  unsigned char buf[40];

  bfd_seek (abfd, 0, SEEK_SET);

  if (bfd_bread ((void *) buf, 40, abfd) != 40)

    return -1;

  header->tag1 = bfd_getb32 (buf);

  header->tag2 = bfd_getb32 (buf + 4);

  header->architecture = bfd_getb32 (buf + 8);

  header->format_version = bfd_getb32 (buf + 12);

  header->timestamp = bfd_getb32 (buf + 16);

  header->old_definition_version = bfd_getb32 (buf + 20);

  header->old_implementation_version = bfd_getb32 (buf + 24);

  header->current_version = bfd_getb32 (buf + 28);

  header->section_count = bfd_getb32 (buf + 32) + 1;

  header->instantiated_section_count = bfd_getb32 (buf + 34);

  header->reserved = bfd_getb32 (buf + 36);

  return 0;

}

static const bfd_target *

bfd_pef_object_p (bfd *abfd)

{

  struct bfd_preserve preserve;

  bfd_pef_header header;

  preserve.marker = NULL;

  if (bfd_pef_read_header (abfd, &header) != 0)

    goto wrong;

  if (header.tag1 != BFD_PEF_TAG1 || header.tag2 != BFD_PEF_TAG2)

    goto wrong;

  preserve.marker = bfd_zalloc (abfd, sizeof (bfd_pef_data_struct));

  if (preserve.marker == NULL

      || !bfd_preserve_save (abfd, &preserve))

    goto fail;

  if (bfd_pef_scan (abfd, &header,

                    (bfd_pef_data_struct *) preserve.marker) != 0)

    goto wrong;

  bfd_preserve_finish (abfd, &preserve);

  return abfd->xvec;

 wrong:

  bfd_set_error (bfd_error_wrong_format);

 fail:

  if (preserve.marker != NULL)

    bfd_preserve_restore (abfd, &preserve);

  return NULL;

}

static int

bfd_pef_parse_traceback_tables (bfd *abfd,

                                asection *sec,

                                unsigned char *buf,

                                size_t len,

                                long *nsym,

                                asymbol **csym)

{

  char *name;

  asymbol function;

  asymbol traceback;

  const char *const tbprefix = "__traceback_";

  size_t tbnamelen;

  size_t pos = 0;

  unsigned long count = 0;

  int ret;

  for (;;)

    {

      /* We're reading symbols two at a time.  */

      if (csym && ((csym[count] == NULL) || (csym[count + 1] == NULL)))

        break;

      pos += 3;

      pos -= (pos % 4);

      while ((pos + 4) <= len)

        {

          if (bfd_getb32 (buf + pos) == 0)

            break;

          pos += 4;