1 files changed, 113 insertions, 0 deletions
diff --git a/sljit/sljitProtExecAllocator.c b/sljit/sljitProtExecAllocator.c
new file mode 100644
index 0000000..90088e2
--- /dev/null
+++ b/sljit/sljitProtExecAllocator.c
@@ -0,0 +1,113 @@
+/*
+ *    Stack-less Just-In-Time compiler
+ *
+ *    Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright notice, this list of
+ *      conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *      of conditions and the following disclaimer in the documentation and/or other materials
+ *      provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+   This file contains a simple executable memory allocator where the
+   allocated regions are not writable and executable in the same time.
+
+   This allocator usually uses more memory than sljitExecAllocator.
+*/
+
+#ifdef _WIN32
+
+static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
+{
+	return VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+}
+
+static SLJIT_INLINE void free_chunk(void* chunk, sljit_uw size)
+{
+	SLJIT_UNUSED_ARG(size);
+	VirtualFree(chunk, 0, MEM_RELEASE);
+}
+
+static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
+{
+	sljit_uw *uw_ptr = (sljit_uw *)ptr;
+
+	VirtualProtect(chunk, size, PAGE_EXECUTE_READ, NULL);
+}
+
+#else
+
+static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
+{
+	void* retval;
+
+#ifdef MAP_ANON
+	retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
+#else
+	if (dev_zero < 0) {
+		if (open_dev_zero())
+			return NULL;
+	}
+	retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
+#endif
+
+	return (retval != MAP_FAILED) ? retval : NULL;
+}
+
+static SLJIT_INLINE void free_chunk(void* chunk, sljit_uw size)
+{
+	munmap(chunk, size);
+}
+
+static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
+{
+	sljit_uw *uw_ptr = (sljit_uw *)chunk;
+
+	mprotect(uw_ptr - 1, size + sizeof(sljit_uw), PROT_READ | PROT_EXEC);
+}
+
+#endif
+
+/* --------------------------------------------------------------------- */
+/*  Common functions                                                     */
+/* --------------------------------------------------------------------- */
+
+SLJIT_API_FUNC_ATTRIBUTE void* sljit_malloc_exec(sljit_uw size)
+{
+	sljit_uw *ptr = (sljit_uw *)alloc_chunk(size + sizeof (sljit_uw));
+
+	*ptr = size;
+	return (void*)(ptr + 1);
+}
+
+SLJIT_API_FUNC_ATTRIBUTE void sljit_free_exec(void* ptr)
+{
+	sljit_uw *uw_ptr = (sljit_uw *)ptr;
+
+	free_chunk(uw_ptr - 1, uw_ptr[-1]);
+}
+
+SLJIT_API_FUNC_ATTRIBUTE void sljit_enable_exec(void* from, void *to)
+{
+	enable_exec_permission(from, ((sljit_u8 *)to) - ((sljit_u8 *)from));
+}
+
+SLJIT_API_FUNC_ATTRIBUTE void sljit_free_unused_memory_exec(void)
+{
+}