示例#1
0
static void
mark_section_writable (LPVOID addr)
{
  MEMORY_BASIC_INFORMATION b;
  PIMAGE_SECTION_HEADER h;
  int i;

  for (i = 0; i < maxSections; i++)
    {
      if (the_secs[i].sec_start <= ((LPBYTE) addr)
          && ((LPBYTE) addr) < (the_secs[i].sec_start + the_secs[i].hash->Misc.VirtualSize))
        return;
    }
  h = __mingw_GetSectionForAddress (addr);
  if (!h)
    {
      __report_error ("Address %p has no image-section", addr);
      return;
    }
  the_secs[i].hash = h;
  the_secs[i].old_protect = 0;
  the_secs[i].sec_start = _GetPEImageBase () + h->VirtualAddress;

  if (!VirtualQuery (the_secs[i].sec_start, &b, sizeof(b)))
    {
      __report_error ("  VirtualQuery failed for %d bytes at address %p",
		      (int) h->Misc.VirtualSize, the_secs[i].sec_start);
      return;
    }

  if (b.Protect != PAGE_EXECUTE_READWRITE && b.Protect != PAGE_READWRITE)
    {
      if (!VirtualProtect (b.BaseAddress, b.RegionSize,
			   PAGE_EXECUTE_READWRITE,
			   &the_secs[i].old_protect))
	__report_error ("  VirtualProtect failed with code 0x%x",
	  (int) GetLastError ());
    }
  ++maxSections;
  return;
}
示例#2
0
int
__mingw_init_ehandler (void)
{
  static int was_here = 0;
  size_t e = 0;
  PIMAGE_SECTION_HEADER pSec;
  PBYTE _ImageBase = _GetPEImageBase ();
  
  if (was_here || !_ImageBase)
    return was_here;
  was_here = 1;
  if (_FindPESectionByName (".pdata") != NULL)
    return 1;

  /* Allocate # of e tables and entries.  */
  memset (emu_pdata, 0, sizeof (RUNTIME_FUNCTION) * MAX_PDATA_ENTRIES);
  memset (emu_xdata, 0, sizeof (UNWIND_INFO) * MAX_PDATA_ENTRIES);
    
  e = 0;
  /* Fill tables and entries.  */
  while (e < MAX_PDATA_ENTRIES && (pSec = _FindPESectionExec (e)) != NULL)
    {
      emu_xdata[e].VersionAndFlags = 9; /* UNW_FLAG_EHANDLER | UNW_VERSION */
      emu_xdata[e].AddressOfExceptionHandler =
	(DWORD)(size_t) ((LPBYTE)__mingw_SEH_error_handler - _ImageBase);
      emu_pdata[e].BeginAddress = pSec->VirtualAddress;
      emu_pdata[e].EndAddress = pSec->VirtualAddress + pSec->Misc.VirtualSize;
      emu_pdata[e].UnwindData =
	(DWORD)(size_t)((LPBYTE)&emu_xdata[e] - _ImageBase);
      ++e;
    }
#ifdef _DEBUG_CRT
  if (!e || e > MAX_PDATA_ENTRIES)
    abort ();
#endif
  /* RtlAddFunctionTable.  */
  if (e != 0)
    RtlAddFunctionTable (emu_pdata, e, (DWORD64)_ImageBase);
  return 1;
}