vm/os-windows.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 HMODULE hFactorDll;
   7
   8 void init_ffi()
   9 {
  10         hFactorDll = GetModuleHandle(FACTOR_DLL);
  11         if(!hFactorDll)
  12                 fatal_error("GetModuleHandle(\"" FACTOR_DLL_NAME "\") failed", 0);
  13 }
  14
  15 void ffi_dlopen(dll *dll)
  16 {
  17         dll->dll = LoadLibraryEx((WCHAR *)alien_offset(dll->path), NULL, 0);
  18 }
  19
  20 void *ffi_dlsym(dll *dll, symbol_char *symbol)
  21 {
  22         return (void *)GetProcAddress(dll ? (HMODULE)dll->dll : hFactorDll, symbol);
  23 }
  24
  25 void ffi_dlclose(dll *dll)
  26 {
  27         FreeLibrary((HMODULE)dll->dll);
  28         dll->dll = NULL;
  29 }
  30
  31 bool 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;
  54         ret = GetFileInformationByHandle(h, &bhfi);
  55         CloseHandle(h);
  56         return ret;
  57 }
  58
  59 void windows_image_path(vm_char *full_path, vm_char *temp_path, unsigned int length)
  60 {
  61         snwprintf(temp_path, length-1, L"%s.image", full_path);
  62         temp_path[sizeof(temp_path) - 1] = 0;
  63 }
  64
  65 /* You must free() this yourself. */
  66 const vm_char *default_image_path()
  67 {
  68         vm_char full_path[MAX_UNICODE_PATH];
  69         vm_char *ptr;
  70         vm_char temp_path[MAX_UNICODE_PATH];
  71
  72         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  73                 fatal_error("GetModuleFileName() failed", 0);
  74
  75         if((ptr = wcsrchr(full_path, '.')))
  76                 *ptr = 0;
  77
  78         snwprintf(temp_path, sizeof(temp_path)-1, L"%s.image", full_path);
  79         temp_path[sizeof(temp_path) - 1] = 0;
  80
  81         return safe_strdup(temp_path);
  82 }
  83
  84 /* You must free() this yourself. */
  85 const vm_char *vm_executable_path()
  86 {
  87         vm_char full_path[MAX_UNICODE_PATH];
  88         if(!GetModuleFileName(NULL, full_path, MAX_UNICODE_PATH))
  89                 fatal_error("GetModuleFileName() failed", 0);
  90         return safe_strdup(full_path);
  91 }
  92
  93
  94 PRIMITIVE(existsp)
  95 {
  96         vm_char *path = untag_check<byte_array>(dpop())->data<vm_char>();
  97         box_boolean(windows_stat(path));
  98 }
  99
 100 segment *alloc_segment(cell size)
 101 {
 102         char *mem;
 103         DWORD ignore;
 104
 105         if((mem = (char *)VirtualAlloc(NULL, getpagesize() * 2 + size,
 106                 MEM_COMMIT, PAGE_EXECUTE_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         segment *block = (segment *)safe_malloc(sizeof(segment));
 117
 118         block->start = (cell)mem + getpagesize();
 119         block->size = size;
 120         block->end = block->start + size;
 121
 122         return block;
 123 }
 124
 125 void dealloc_segment(segment *block)
 126 {
 127         SYSTEM_INFO si;
 128         GetSystemInfo(&si);
 129         if(!VirtualFree((void*)(block->start - si.dwPageSize), 0, MEM_RELEASE))
 130                 fatal_error("dealloc_segment failed",0);
 131         free(block);
 132 }
 133
 134 long getpagesize()
 135 {
 136         static long g_pagesize = 0;
 137         if (! g_pagesize)
 138         {
 139                 SYSTEM_INFO system_info;
 140                 GetSystemInfo (&system_info);
 141                 g_pagesize = system_info.dwPageSize;
 142         }
 143         return g_pagesize;
 144 }
 145
 146 void sleep_micros(u64 usec)
 147 {
 148         Sleep((DWORD)(usec / 1000));
 149 }
 150
 151 }