1 files changed, 155 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/execmem.c b/mesalib/src/mesa/main/execmem.c
new file mode 100644
index 000000000..57c1e117c
--- /dev/null
+++ b/mesalib/src/mesa/main/execmem.c
@@ -0,0 +1,155 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5
+ *
+ * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
+ *
+ * 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
+ * BRIAN PAUL 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.
+ */
+
+
+/**
+ * \file execmem.c
+ * Functions for allocating executable memory.
+ *
+ * \author Keith Whitwell
+ */
+
+
+#include "imports.h"
+#include "glapi/glthread.h"
+
+
+
+#if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun)
+
+/*
+ * Allocate a large block of memory which can hold code then dole it out
+ * in pieces by means of the generic memory manager code.
+*/
+
+#include <unistd.h>
+#include <sys/mman.h>
+#include "mm.h"
+
+#ifdef MESA_SELINUX
+#include <selinux/selinux.h>
+#endif
+
+
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+
+
+#define EXEC_HEAP_SIZE (10*1024*1024)
+
+_glthread_DECLARE_STATIC_MUTEX(exec_mutex);
+
+static struct mem_block *exec_heap = NULL;
+static unsigned char *exec_mem = NULL;
+
+
+static int
+init_heap(void)
+{
+#ifdef MESA_SELINUX
+   if (is_selinux_enabled()) {
+      if (!security_get_boolean_active("allow_execmem") ||
+	  !security_get_boolean_pending("allow_execmem"))
+         return 0;
+   }
+#endif
+
+   if (!exec_heap)
+      exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
+   
+   if (!exec_mem)
+      exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE, 
+					PROT_EXEC | PROT_READ | PROT_WRITE, 
+					MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+   return (exec_mem != NULL);
+}
+
+
+void *
+_mesa_exec_malloc(GLuint size)
+{
+   struct mem_block *block = NULL;
+   void *addr = NULL;
+
+   _glthread_LOCK_MUTEX(exec_mutex);
+
+   if (!init_heap())
+      goto bail;
+
+   if (exec_heap) {
+      size = (size + 31) & ~31;
+      block = mmAllocMem( exec_heap, size, 32, 0 );
+   }
+
+   if (block)
+      addr = exec_mem + block->ofs;
+   else 
+      _mesa_printf("_mesa_exec_malloc failed\n");
+
+bail:
+   _glthread_UNLOCK_MUTEX(exec_mutex);
+   
+   return addr;
+}
+
+ 
+void 
+_mesa_exec_free(void *addr)
+{
+   _glthread_LOCK_MUTEX(exec_mutex);
+
+   if (exec_heap) {
+      struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
+   
+      if (block)
+	 mmFreeMem(block);
+   }
+
+   _glthread_UNLOCK_MUTEX(exec_mutex);
+}
+
+
+#else
+
+/*
+ * Just use regular memory.
+ */
+
+void *
+_mesa_exec_malloc(GLuint size)
+{
+   return _mesa_malloc( size );
+}
+
+ 
+void 
+_mesa_exec_free(void *addr)
+{
+   _mesa_free(addr);
+}
+
+
+#endif