vm/os-windows.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 HMODULE hFactorDll;
   7
   8 void factor_vm::init_ffi()
   9 {
  10         hFactorDll = GetModuleHandle(FACTOR_DLL);
  11         if(!hFactorDll)
  12                 fatal_error("GetModuleHandle() failed", 0);
  13 }
  14
  15 void factor_vm::ffi_dlopen(dll *dll)
  16 {
  17         dll->handle = LoadLibraryEx((WCHAR *)alien_offset(dll->path), NULL, 0);
  18 }
  19
  20 void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
  21 {
  22         return (void *)GetProcAddress(dll ? (HMODULE)dll->handle : hFactorDll, symbol);
  23 }
  24
  25 void factor_vm::ffi_dlclose(dll *dll)
  26 {
  27         FreeLibrary((HMODULE)dll->handle);
  28         dll->handle = NULL;
  29 }
  30
  31 BOOL factor_vm::windows_stat(vm_char *path)
  32 {
  33         BY_HANDLE_FILE_INFORMATION bhfi;
  34         HANDLE h = CreateFileW(path,
  35                         GENERIC_READ,
  36                         FILE_SHARE_READ,
  37                         NULL,
  38                         OPEN_EXISTING,
  39                         FILE_FLAG_BACKUP_SEMANTICS,
  40                         NULL);
  41
  42         if(h == INVALID_HANDLE_VALUE)
  43         {
  44                 // FindFirstFile is the only call that can stat c:\pagefile.sys
  45                 WIN32_FIND_DATA st;
  46                 HANDLE h;
  47
  48                 if(INVALID_HANDLE_VALUE == (h = FindFirstFile(path, &st)))
  49                         return false;
  50                 FindClose(h);
  51                 return true;
  52         }
  53         BOOL ret = GetFileInformationByHandle(h, &bhfi);
  54         CloseHandle(h);
  55         return ret;
  56 }
  57
  58 void factor_vm::windows_image_path(vm_char *full_path, vm_char *temp_path, unsigned int length)
  59 {
  60         SNWPRINTF(temp_path, length-1, L"%s.image", full_path);
  61         temp_path[length - 1] = 0;
  62 }
  63
  64 /* You must free() this yourself. */
  65 const vm_char *factor_vm::default_image_path()
  66 {
  67         vm_char full_path[MAX_UNICODE_PATH];
  68         vm_char *ptr;
  69         vm_char temp_path[MAX_UNICODE_PATH];
  70
  71         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  72                 fatal_error("GetModuleFileName() failed", 0);
  73
  74         if((ptr = wcsrchr(full_path, '.')))
  75                 *ptr = 0;
  76
  77         SNWPRINTF(temp_path, MAX_UNICODE_PATH-1, L"%s.image", full_path);
  78         temp_path[MAX_UNICODE_PATH - 1] = 0;
  79
  80         return safe_strdup(temp_path);
  81 }
  82
  83 /* You must free() this yourself. */
  84 const vm_char *factor_vm::vm_executable_path()
  85 {
  86         vm_char full_path[MAX_UNICODE_PATH];
  87         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  88                 fatal_error("GetModuleFileName() failed", 0);
  89         return safe_strdup(full_path);
  90 }
  91
  92 void factor_vm::primitive_existsp()
  93 {
  94         vm_char *path = untag_check<byte_array>(ctx->pop())->data<vm_char>();
  95         ctx->push(tag_boolean(windows_stat(path)));
  96 }
  97
  98 segment::segment(cell size_, bool executable_p)
  99 {
 100         size = size_;
 101
 102         char *mem;
 103         DWORD ignore;
 104
 105         if((mem = (char *)VirtualAlloc(NULL, getpagesize() * 2 + size,
 106                 MEM_COMMIT, executable_p ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE)) == 0)
 107                 out_of_memory();
 108
 109         if (!VirtualProtect(mem, getpagesize(), PAGE_NOACCESS, &ignore))
 110                 fatal_error("Cannot allocate low guard page", (cell)mem);
 111
 112         if (!VirtualProtect(mem + size + getpagesize(),
 113                 getpagesize(), PAGE_NOACCESS, &ignore))
 114                 fatal_error("Cannot allocate high guard page", (cell)mem);
 115
 116         start = (cell)mem + getpagesize();
 117         end = start + size;
 118 }
 119
 120 segment::~segment()
 121 {
 122         SYSTEM_INFO si;
 123         GetSystemInfo(&si);
 124         if(!VirtualFree((void*)(start - si.dwPageSize), 0, MEM_RELEASE))
 125                 fatal_error("Segment deallocation failed",0);
 126 }
 127
 128 long getpagesize()
 129 {
 130         static long g_pagesize = 0;
 131         if (! g_pagesize)
 132         {
 133                 SYSTEM_INFO system_info;
 134                 GetSystemInfo (&system_info);
 135                 g_pagesize = system_info.dwPageSize;
 136         }
 137         return g_pagesize;
 138 }
 139
 140 }