libretro, update libretro-common

platform/libretro/libretro-common/memmap/memmap.c

@@ -0,0 +1,163 @@
+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (memmap.c).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <memmap.h>
+
+#ifndef PROT_READ
+#define PROT_READ         0x1  /* Page can be read */
+#endif
+
+#ifndef PROT_WRITE
+#define PROT_WRITE        0x2  /* Page can be written. */
+#endif
+
+#ifndef PROT_READWRITE
+#define PROT_READWRITE    0x3  /* Page can be written to and read from. */
+#endif
+
+#ifndef PROT_EXEC
+#define PROT_EXEC         0x4  /* Page can be executed. */
+#endif
+
+#ifndef PROT_NONE
+#define PROT_NONE         0x0  /* Page can not be accessed. */
+#endif
+
+#ifndef MAP_FAILED
+#define MAP_FAILED        ((void *) -1)
+#endif
+
+#ifdef _WIN32
+void* mmap(void *addr, size_t len, int prot, int flags,
+      int fildes, size_t offset)
+{
+   void     *map = (void*)NULL;
+   HANDLE handle = INVALID_HANDLE_VALUE;
+
+   switch (prot)
+   {
+      case PROT_READ:
+      default:
+         handle = CreateFileMapping((HANDLE)
+               _get_osfhandle(fildes), 0, PAGE_READONLY, 0,
+               len, 0);
+         if (!handle)
+            break;
+         map = (void*)MapViewOfFile(handle, FILE_MAP_READ, 0, 0, len);
+         CloseHandle(handle);
+         break;
+      case PROT_WRITE:
+         handle = CreateFileMapping((HANDLE)
+               _get_osfhandle(fildes),0,PAGE_READWRITE,0,
+               len, 0);
+         if (!handle)
+            break;
+         map = (void*)MapViewOfFile(handle, FILE_MAP_WRITE, 0, 0, len);
+         CloseHandle(handle);
+         break;
+      case PROT_READWRITE:
+         handle = CreateFileMapping((HANDLE)
+               _get_osfhandle(fildes),0,PAGE_READWRITE,0,
+               len, 0);
+         if (!handle)
+            break;
+         map = (void*)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, len);
+         CloseHandle(handle);
+         break;
+   }
+
+   if (map == (void*)NULL)
+      return((void*)MAP_FAILED);
+   return((void*) ((int8_t*)map + offset));
+}
+
+int munmap(void *addr, size_t length)
+{
+   if (!UnmapViewOfFile(addr))
+      return -1;
+   return 0;
+}
+
+int mprotect(void *addr, size_t len, int prot)
+{
+   /* Incomplete, just assumes PAGE_EXECUTE_READWRITE right now
+    * instead of correctly handling prot */
+   prot = 0;
+   if (prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
+      prot = PAGE_EXECUTE_READWRITE;
+   return VirtualProtect(addr, len, prot, 0);
+}
+
+#elif !defined(HAVE_MMAN)
+void* mmap(void *addr, size_t len, int prot, int flags,
+      int fildes, size_t offset)
+{
+   return malloc(len);
+}
+
+int munmap(void *addr, size_t len)
+{
+   free(addr);
+   return 0;
+}
+
+int mprotect(void *addr, size_t len, int prot)
+{
+   /* stub - not really needed at this point
+    * since this codepath has no dynarecs. */
+   return 0;
+}
+
+#endif
+
+#if defined(__MACH__) && defined(__arm__)
+#include <libkern/OSCacheControl.h>
+#endif
+
+int memsync(void *start, void *end)
+{
+   size_t len = (char*)end - (char*)start;
+#if defined(__MACH__) && defined(__arm__)
+   sys_dcache_flush(start ,len);
+   sys_icache_invalidate(start, len);
+   return 0;
+#elif defined(__arm__) && !defined(__QNX__)
+   (void)len;
+   __clear_cache(start, end);
+   return 0;
+#elif defined(HAVE_MMAN)
+   return msync(start, len, MS_SYNC | MS_INVALIDATE
+#ifdef __QNX__
+         MS_CACHE_ONLY
+#endif
+         );
+#else
+   (void)len;
+   return 0;
+#endif
+}
+
+int memprotect(void *addr, size_t len)
+{
+   return mprotect(addr, len, PROT_READ | PROT_WRITE | PROT_EXEC);
+}