Initial import

third_party/compiler_rt/nexgen32e/chkstk.S

@@ -0,0 +1,43 @@
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+
+#include "third_party/compiler_rt/assembly.h"
+
+// _chkstk routine
+// This routine is windows specific
+// http://msdn.microsoft.com/en-us/library/ms648426.aspx
+
+// Notes from r227519
+// MSVC x64s __chkstk and cygmings ___chkstk_ms do not adjust %rsp
+// themselves. It also does not clobber %rax so we can reuse it when
+// adjusting %rsp.
+
+#ifdef __x86_64__
+
+	.section .yoink
+	nop	huge_compiler_rt_license
+	.previous
+
+.text
+.balign 4
+DEFINE_COMPILERRT_FUNCTION(___chkstk_ms)
+        push   %rcx
+        push   %rax
+        cmp    $0x1000,%rax
+        lea    24(%rsp),%rcx
+        jb     1f
+2:
+        sub    $0x1000,%rcx
+        test   %rcx,(%rcx)
+        sub    $0x1000,%rax
+        cmp    $0x1000,%rax
+        ja     2b
+1:
+        sub    %rax,%rcx
+        test   %rcx,(%rcx)
+        pop    %rax
+        pop    %rcx
+        ret
+END_COMPILERRT_FUNCTION(___chkstk_ms)
+
+#endif // __x86_64__