1 files changed, 49 insertions, 0 deletions
diff --git a/src/grt/config/chkstk-x64.S b/src/grt/config/chkstk-x64.S
new file mode 100644
index 000000000..e19c20786
--- /dev/null
+++ b/src/grt/config/chkstk-x64.S
@@ -0,0 +1,49 @@
+/*  GRT stack implementation for x86.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <gnu.org/licenses>.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"chkstk-x64.S"
+
+	.text
+
+/* Check stack for alloca: probe every page.
+   Argument is %rax (amount of bytes to be allocated)
+   *No* registers are clobbered.  */
+	
+	.align 4
+	.globl __chkstk_ms
+__chkstk_ms:
+	push   %rcx
+	push   %rax
+	cmp    $0x1000,%rax
+	lea    0x18(%rsp),%rcx
+	jb     1f
+0:	sub    $0x1000,%rcx
+	orq    $0x0,(%rcx)
+	sub    $0x1000,%rax
+	cmp    $0x1000,%rax
+	ja     0b
+1:	sub    %rax,%rcx
+	orq    $0x0,(%rcx)
+	pop    %rax
+	pop    %rcx
+	ret