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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [coff-pe-read.c] - Diff between revs 227 and 816

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/* Read the export table symbols from a portable executable and
/* Read the export table symbols from a portable executable and
   convert to internal format, for GDB. Used as a last resort if no
   convert to internal format, for GDB. Used as a last resort if no
   debugging symbols recognized.
   debugging symbols recognized.
 
 
   Copyright (C) 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   Copyright (C) 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
   Contributed by Raoul M. Gough (RaoulGough@yahoo.co.uk). */
   Contributed by Raoul M. Gough (RaoulGough@yahoo.co.uk). */
 
 
#include "coff-pe-read.h"
#include "coff-pe-read.h"
 
 
#include "bfd.h"
#include "bfd.h"
 
 
#include "defs.h"
#include "defs.h"
#include "gdbtypes.h"
#include "gdbtypes.h"
 
 
#include "symtab.h"
#include "symtab.h"
#include "symfile.h"
#include "symfile.h"
#include "objfiles.h"
#include "objfiles.h"
 
 
/* Internal section information */
/* Internal section information */
 
 
struct read_pe_section_data
struct read_pe_section_data
{
{
  CORE_ADDR vma_offset;         /* Offset to loaded address of section. */
  CORE_ADDR vma_offset;         /* Offset to loaded address of section. */
  unsigned long rva_start;      /* Start offset within the pe. */
  unsigned long rva_start;      /* Start offset within the pe. */
  unsigned long rva_end;        /* End offset within the pe. */
  unsigned long rva_end;        /* End offset within the pe. */
  enum minimal_symbol_type ms_type;     /* Type to assign symbols in section. */
  enum minimal_symbol_type ms_type;     /* Type to assign symbols in section. */
};
};
 
 
#define PE_SECTION_INDEX_TEXT     0
#define PE_SECTION_INDEX_TEXT     0
#define PE_SECTION_INDEX_DATA     1
#define PE_SECTION_INDEX_DATA     1
#define PE_SECTION_INDEX_BSS      2
#define PE_SECTION_INDEX_BSS      2
#define PE_SECTION_TABLE_SIZE     3
#define PE_SECTION_TABLE_SIZE     3
#define PE_SECTION_INDEX_INVALID -1
#define PE_SECTION_INDEX_INVALID -1


/* Get the index of the named section in our own array, which contains
/* Get the index of the named section in our own array, which contains
   text, data and bss in that order. Return PE_SECTION_INDEX_INVALID
   text, data and bss in that order. Return PE_SECTION_INDEX_INVALID
   if passed an unrecognised section name. */
   if passed an unrecognised section name. */
 
 
static int
static int
read_pe_section_index (const char *section_name)
read_pe_section_index (const char *section_name)
{
{
  if (strcmp (section_name, ".text") == 0)
  if (strcmp (section_name, ".text") == 0)
    {
    {
      return PE_SECTION_INDEX_TEXT;
      return PE_SECTION_INDEX_TEXT;
    }
    }
 
 
  else if (strcmp (section_name, ".data") == 0)
  else if (strcmp (section_name, ".data") == 0)
    {
    {
      return PE_SECTION_INDEX_DATA;
      return PE_SECTION_INDEX_DATA;
    }
    }
 
 
  else if (strcmp (section_name, ".bss") == 0)
  else if (strcmp (section_name, ".bss") == 0)
    {
    {
      return PE_SECTION_INDEX_BSS;
      return PE_SECTION_INDEX_BSS;
    }
    }
 
 
  else
  else
    {
    {
      return PE_SECTION_INDEX_INVALID;
      return PE_SECTION_INDEX_INVALID;
    }
    }
}
}
 
 
/* Record the virtual memory address of a section. */
/* Record the virtual memory address of a section. */
 
 
static void
static void
get_section_vmas (bfd *abfd, asection *sectp, void *context)
get_section_vmas (bfd *abfd, asection *sectp, void *context)
{
{
  struct read_pe_section_data *sections = context;
  struct read_pe_section_data *sections = context;
  int sectix = read_pe_section_index (sectp->name);
  int sectix = read_pe_section_index (sectp->name);
 
 
  if (sectix != PE_SECTION_INDEX_INVALID)
  if (sectix != PE_SECTION_INDEX_INVALID)
    {
    {
      /* Data within the section start at rva_start in the pe and at
      /* Data within the section start at rva_start in the pe and at
         bfd_get_section_vma() within memory. Store the offset. */
         bfd_get_section_vma() within memory. Store the offset. */
 
 
      sections[sectix].vma_offset
      sections[sectix].vma_offset
        = bfd_get_section_vma (abfd, sectp) - sections[sectix].rva_start;
        = bfd_get_section_vma (abfd, sectp) - sections[sectix].rva_start;
    }
    }
}
}


/* Create a minimal symbol entry for an exported symbol. */
/* Create a minimal symbol entry for an exported symbol. */
 
 
static void
static void
add_pe_exported_sym (char *sym_name,
add_pe_exported_sym (char *sym_name,
                     unsigned long func_rva,
                     unsigned long func_rva,
                     const struct read_pe_section_data *section_data,
                     const struct read_pe_section_data *section_data,
                     const char *dll_name, struct objfile *objfile)
                     const char *dll_name, struct objfile *objfile)
{
{
  /* Add the stored offset to get the loaded address of the symbol. */
  /* Add the stored offset to get the loaded address of the symbol. */
 
 
  CORE_ADDR vma = func_rva + section_data->vma_offset;
  CORE_ADDR vma = func_rva + section_data->vma_offset;
 
 
  char *qualified_name = 0;
  char *qualified_name = 0;
  int dll_name_len = strlen (dll_name);
  int dll_name_len = strlen (dll_name);
  int count;
  int count;
 
 
  /* Generate a (hopefully unique) qualified name using the first part
  /* Generate a (hopefully unique) qualified name using the first part
     of the dll name, e.g. KERNEL32!AddAtomA. This matches the style
     of the dll name, e.g. KERNEL32!AddAtomA. This matches the style
     used by windbg from the "Microsoft Debugging Tools for Windows". */
     used by windbg from the "Microsoft Debugging Tools for Windows". */
 
 
  qualified_name = xmalloc (dll_name_len + strlen (sym_name) + 2);
  qualified_name = xmalloc (dll_name_len + strlen (sym_name) + 2);
 
 
  strncpy (qualified_name, dll_name, dll_name_len);
  strncpy (qualified_name, dll_name, dll_name_len);
  qualified_name[dll_name_len] = '!';
  qualified_name[dll_name_len] = '!';
  strcpy (qualified_name + dll_name_len + 1, sym_name);
  strcpy (qualified_name + dll_name_len + 1, sym_name);
 
 
  prim_record_minimal_symbol (qualified_name,
  prim_record_minimal_symbol (qualified_name,
                              vma, section_data->ms_type, objfile);
                              vma, section_data->ms_type, objfile);
 
 
  xfree (qualified_name);
  xfree (qualified_name);
 
 
  /* Enter the plain name as well, which might not be unique. */
  /* Enter the plain name as well, which might not be unique. */
  prim_record_minimal_symbol (sym_name, vma, section_data->ms_type, objfile);
  prim_record_minimal_symbol (sym_name, vma, section_data->ms_type, objfile);
}
}
 
 
/* Truncate a dll_name at the first dot character. */
/* Truncate a dll_name at the first dot character. */
 
 
static void
static void
read_pe_truncate_name (char *dll_name)
read_pe_truncate_name (char *dll_name)
{
{
  while (*dll_name)
  while (*dll_name)
    {
    {
      if ((*dll_name) == '.')
      if ((*dll_name) == '.')
        {
        {
          *dll_name = '\0';     /* truncates and causes loop exit. */
          *dll_name = '\0';     /* truncates and causes loop exit. */
        }
        }
 
 
      else
      else
        {
        {
          ++dll_name;
          ++dll_name;
        }
        }
    }
    }
}
}


/* Low-level support functions, direct from the ld module pe-dll.c. */
/* Low-level support functions, direct from the ld module pe-dll.c. */
static unsigned int
static unsigned int
pe_get16 (bfd *abfd, int where)
pe_get16 (bfd *abfd, int where)
{
{
  unsigned char b[2];
  unsigned char b[2];
 
 
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
  bfd_bread (b, (bfd_size_type) 2, abfd);
  bfd_bread (b, (bfd_size_type) 2, abfd);
  return b[0] + (b[1] << 8);
  return b[0] + (b[1] << 8);
}
}
 
 
static unsigned int
static unsigned int
pe_get32 (bfd *abfd, int where)
pe_get32 (bfd *abfd, int where)
{
{
  unsigned char b[4];
  unsigned char b[4];
 
 
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
  bfd_seek (abfd, (file_ptr) where, SEEK_SET);
  bfd_bread (b, (bfd_size_type) 4, abfd);
  bfd_bread (b, (bfd_size_type) 4, abfd);
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
}
}
 
 
static unsigned int
static unsigned int
pe_as32 (void *ptr)
pe_as32 (void *ptr)
{
{
  unsigned char *b = ptr;
  unsigned char *b = ptr;
 
 
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
  return b[0] + (b[1] << 8) + (b[2] << 16) + (b[3] << 24);
}
}


/* Read the (non-debug) export symbol table from a portable
/* Read the (non-debug) export symbol table from a portable
   executable. Code originally lifted from the ld function
   executable. Code originally lifted from the ld function
   pe_implied_import_dll in pe-dll.c. */
   pe_implied_import_dll in pe-dll.c. */
 
 
void
void
read_pe_exported_syms (struct objfile *objfile)
read_pe_exported_syms (struct objfile *objfile)
{
{
  bfd *dll = objfile->obfd;
  bfd *dll = objfile->obfd;
  unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
  unsigned long pe_header_offset, opthdr_ofs, num_entries, i;
  unsigned long export_rva, export_size, nsections, secptr, expptr;
  unsigned long export_rva, export_size, nsections, secptr, expptr;
  unsigned long exp_funcbase;
  unsigned long exp_funcbase;
  unsigned char *expdata, *erva;
  unsigned char *expdata, *erva;
  unsigned long name_rvas, ordinals, nexp, ordbase;
  unsigned long name_rvas, ordinals, nexp, ordbase;
  char *dll_name;
  char *dll_name;
  int is_pe64 = 0;
  int is_pe64 = 0;
  int is_pe32 = 0;
  int is_pe32 = 0;
 
 
  /* Array elements are for text, data and bss in that order
  /* Array elements are for text, data and bss in that order
     Initialization with start_rva > end_rva guarantees that
     Initialization with start_rva > end_rva guarantees that
     unused sections won't be matched. */
     unused sections won't be matched. */
  struct read_pe_section_data section_data[PE_SECTION_TABLE_SIZE]
  struct read_pe_section_data section_data[PE_SECTION_TABLE_SIZE]
    = { {0, 1, 0, mst_text},
    = { {0, 1, 0, mst_text},
  {0, 1, 0, mst_data},
  {0, 1, 0, mst_data},
  {0, 1, 0, mst_bss}
  {0, 1, 0, mst_bss}
  };
  };
 
 
  struct cleanup *back_to = 0;
  struct cleanup *back_to = 0;
 
 
  char const *target = bfd_get_target (objfile->obfd);
  char const *target = bfd_get_target (objfile->obfd);
 
 
  is_pe64 = (strcmp (target, "pe-x86-64") == 0
  is_pe64 = (strcmp (target, "pe-x86-64") == 0
             || strcmp (target, "pei-x86-64") == 0);
             || strcmp (target, "pei-x86-64") == 0);
  is_pe32 = (strcmp (target, "pe-i386") == 0
  is_pe32 = (strcmp (target, "pe-i386") == 0
             || strcmp (target, "pei-i386") == 0
             || strcmp (target, "pei-i386") == 0
             || strcmp (target, "pe-arm-wince-little") == 0
             || strcmp (target, "pe-arm-wince-little") == 0
             || strcmp (target, "pei-arm-wince-little") == 0);
             || strcmp (target, "pei-arm-wince-little") == 0);
 
 
  if (!is_pe32 && !is_pe64)
  if (!is_pe32 && !is_pe64)
    {
    {
      /* This is not a recognized PE format file.  Abort now, because
      /* This is not a recognized PE format file.  Abort now, because
         the code is untested on anything else.  *FIXME* test on
         the code is untested on anything else.  *FIXME* test on
         further architectures and loosen or remove this test. */
         further architectures and loosen or remove this test. */
      return;
      return;
    }
    }
 
 
  /* Get pe_header, optional header and numbers of export entries.  */
  /* Get pe_header, optional header and numbers of export entries.  */
  pe_header_offset = pe_get32 (dll, 0x3c);
  pe_header_offset = pe_get32 (dll, 0x3c);
  opthdr_ofs = pe_header_offset + 4 + 20;
  opthdr_ofs = pe_header_offset + 4 + 20;
  if (is_pe64)
  if (is_pe64)
    num_entries = pe_get32 (dll, opthdr_ofs + 108);
    num_entries = pe_get32 (dll, opthdr_ofs + 108);
  else
  else
    num_entries = pe_get32 (dll, opthdr_ofs + 92);
    num_entries = pe_get32 (dll, opthdr_ofs + 92);
 
 
  if (num_entries < 1)          /* No exports.  */
  if (num_entries < 1)          /* No exports.  */
    {
    {
      return;
      return;
    }
    }
 
 
  if (is_pe64)
  if (is_pe64)
    {
    {
      export_rva = pe_get32 (dll, opthdr_ofs + 112);
      export_rva = pe_get32 (dll, opthdr_ofs + 112);
      export_size = pe_get32 (dll, opthdr_ofs + 116);
      export_size = pe_get32 (dll, opthdr_ofs + 116);
    }
    }
  else
  else
    {
    {
      export_rva = pe_get32 (dll, opthdr_ofs + 96);
      export_rva = pe_get32 (dll, opthdr_ofs + 96);
      export_size = pe_get32 (dll, opthdr_ofs + 100);
      export_size = pe_get32 (dll, opthdr_ofs + 100);
    }
    }
  nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
  nsections = pe_get16 (dll, pe_header_offset + 4 + 2);
  secptr = (pe_header_offset + 4 + 20 +
  secptr = (pe_header_offset + 4 + 20 +
            pe_get16 (dll, pe_header_offset + 4 + 16));
            pe_get16 (dll, pe_header_offset + 4 + 16));
  expptr = 0;
  expptr = 0;
 
 
  /* Get the rva and size of the export section.  */
  /* Get the rva and size of the export section.  */
  for (i = 0; i < nsections; i++)
  for (i = 0; i < nsections; i++)
    {
    {
      char sname[8];
      char sname[8];
      unsigned long secptr1 = secptr + 40 * i;
      unsigned long secptr1 = secptr + 40 * i;
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
      unsigned long vsize = pe_get32 (dll, secptr1 + 16);
      unsigned long vsize = pe_get32 (dll, secptr1 + 16);
      unsigned long fptr = pe_get32 (dll, secptr1 + 20);
      unsigned long fptr = pe_get32 (dll, secptr1 + 20);
 
 
      bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
      bfd_seek (dll, (file_ptr) secptr1, SEEK_SET);
      bfd_bread (sname, (bfd_size_type) 8, dll);
      bfd_bread (sname, (bfd_size_type) 8, dll);
 
 
      if (vaddr <= export_rva && vaddr + vsize > export_rva)
      if (vaddr <= export_rva && vaddr + vsize > export_rva)
        {
        {
          expptr = fptr + (export_rva - vaddr);
          expptr = fptr + (export_rva - vaddr);
          if (export_rva + export_size > vaddr + vsize)
          if (export_rva + export_size > vaddr + vsize)
            export_size = vsize - (export_rva - vaddr);
            export_size = vsize - (export_rva - vaddr);
          break;
          break;
        }
        }
    }
    }
 
 
  if (export_size == 0)
  if (export_size == 0)
    {
    {
      /* Empty export table. */
      /* Empty export table. */
      return;
      return;
    }
    }
 
 
  /* Scan sections and store the base and size of the relevant sections. */
  /* Scan sections and store the base and size of the relevant sections. */
  for (i = 0; i < nsections; i++)
  for (i = 0; i < nsections; i++)
    {
    {
      unsigned long secptr1 = secptr + 40 * i;
      unsigned long secptr1 = secptr + 40 * i;
      unsigned long vsize = pe_get32 (dll, secptr1 + 8);
      unsigned long vsize = pe_get32 (dll, secptr1 + 8);
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
      unsigned long vaddr = pe_get32 (dll, secptr1 + 12);
      unsigned long flags = pe_get32 (dll, secptr1 + 36);
      unsigned long flags = pe_get32 (dll, secptr1 + 36);
      char sec_name[9];
      char sec_name[9];
      int sectix;
      int sectix;
 
 
      sec_name[8] = '\0';
      sec_name[8] = '\0';
      bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET);
      bfd_seek (dll, (file_ptr) secptr1 + 0, SEEK_SET);
      bfd_bread (sec_name, (bfd_size_type) 8, dll);
      bfd_bread (sec_name, (bfd_size_type) 8, dll);
 
 
      sectix = read_pe_section_index (sec_name);
      sectix = read_pe_section_index (sec_name);
 
 
      if (sectix != PE_SECTION_INDEX_INVALID)
      if (sectix != PE_SECTION_INDEX_INVALID)
        {
        {
          section_data[sectix].rva_start = vaddr;
          section_data[sectix].rva_start = vaddr;
          section_data[sectix].rva_end = vaddr + vsize;
          section_data[sectix].rva_end = vaddr + vsize;
        }
        }
    }
    }
 
 
  expdata = (unsigned char *) xmalloc (export_size);
  expdata = (unsigned char *) xmalloc (export_size);
  back_to = make_cleanup (xfree, expdata);
  back_to = make_cleanup (xfree, expdata);
 
 
  bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
  bfd_seek (dll, (file_ptr) expptr, SEEK_SET);
  bfd_bread (expdata, (bfd_size_type) export_size, dll);
  bfd_bread (expdata, (bfd_size_type) export_size, dll);
  erva = expdata - export_rva;
  erva = expdata - export_rva;
 
 
  nexp = pe_as32 (expdata + 24);
  nexp = pe_as32 (expdata + 24);
  name_rvas = pe_as32 (expdata + 32);
  name_rvas = pe_as32 (expdata + 32);
  ordinals = pe_as32 (expdata + 36);
  ordinals = pe_as32 (expdata + 36);
  ordbase = pe_as32 (expdata + 16);
  ordbase = pe_as32 (expdata + 16);
  exp_funcbase = pe_as32 (expdata + 28);
  exp_funcbase = pe_as32 (expdata + 28);
 
 
  /* Use internal dll name instead of full pathname. */
  /* Use internal dll name instead of full pathname. */
  dll_name = pe_as32 (expdata + 12) + erva;
  dll_name = pe_as32 (expdata + 12) + erva;
 
 
  bfd_map_over_sections (dll, get_section_vmas, section_data);
  bfd_map_over_sections (dll, get_section_vmas, section_data);
 
 
  /* Adjust the vma_offsets in case this PE got relocated. This
  /* Adjust the vma_offsets in case this PE got relocated. This
     assumes that *all* sections share the same relocation offset
     assumes that *all* sections share the same relocation offset
     as the text section. */
     as the text section. */
  for (i = 0; i < PE_SECTION_TABLE_SIZE; i++)
  for (i = 0; i < PE_SECTION_TABLE_SIZE; i++)
    {
    {
      section_data[i].vma_offset
      section_data[i].vma_offset
        += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
        += ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
    }
    }
 
 
  /* Truncate name at first dot. Should maybe also convert to all
  /* Truncate name at first dot. Should maybe also convert to all
     lower case for convenience on Windows. */
     lower case for convenience on Windows. */
  read_pe_truncate_name (dll_name);
  read_pe_truncate_name (dll_name);
 
 
  /* Iterate through the list of symbols.  */
  /* Iterate through the list of symbols.  */
  for (i = 0; i < nexp; i++)
  for (i = 0; i < nexp; i++)
    {
    {
      /* Pointer to the names vector.  */
      /* Pointer to the names vector.  */
      unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
      unsigned long name_rva = pe_as32 (erva + name_rvas + i * 4);
 
 
      /* Pointer to the function address vector.  */
      /* Pointer to the function address vector.  */
      unsigned long func_rva = pe_as32 (erva + exp_funcbase + i * 4);
      unsigned long func_rva = pe_as32 (erva + exp_funcbase + i * 4);
 
 
      /* Find this symbol's section in our own array. */
      /* Find this symbol's section in our own array. */
      int sectix = 0;
      int sectix = 0;
 
 
      for (sectix = 0; sectix < PE_SECTION_TABLE_SIZE; ++sectix)
      for (sectix = 0; sectix < PE_SECTION_TABLE_SIZE; ++sectix)
        {
        {
          if ((func_rva >= section_data[sectix].rva_start)
          if ((func_rva >= section_data[sectix].rva_start)
              && (func_rva < section_data[sectix].rva_end))
              && (func_rva < section_data[sectix].rva_end))
            {
            {
              add_pe_exported_sym (erva + name_rva,
              add_pe_exported_sym (erva + name_rva,
                                   func_rva,
                                   func_rva,
                                   section_data + sectix, dll_name, objfile);
                                   section_data + sectix, dll_name, objfile);
              break;
              break;
            }
            }
        }
        }
    }
    }
 
 
  /* discard expdata. */
  /* discard expdata. */
  do_cleanups (back_to);
  do_cleanups (back_to);
}
}
 
 

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