1 files changed, 32 insertions, 0 deletions
diff --git a/gcc/config/i386/cygwin.asm b/gcc/config/i386/cygwin.asm
new file mode 100644
index 00000000000..4ac4c91a3b1
--- /dev/null
+++ b/gcc/config/i386/cygwin.asm
@@ -0,0 +1,32 @@
+/* stuff needed for libgcc1 on win32. */
+
+#ifdef L_chkstk
+
+	.global ___chkstk
+	.global	__alloca
+___chkstk:
+__alloca:
+	pushl  %ecx		/* save temp */
+	movl   %esp,%ecx	/* get sp */
+	addl   $0x8,%ecx	/* and point to return addr */
+
+probe: 	cmpl   $0x1000,%eax	/* > 4k ?*/
+	jb    done		
+
+	subl   $0x1000,%ecx  		/* yes, move pointer down 4k*/
+	orl    $0x0,(%ecx)   		/* probe there */
+	subl   $0x1000,%eax  	 	/* decrement count */
+	jmp    probe           	 	/* and do it again */
+
+done: 	subl   %eax,%ecx	   
+	orl    $0x0,(%ecx)	/* less that 4k, just peek here */
+
+	movl   %esp,%eax
+	movl   %ecx,%esp	/* decrement stack */
+
+	movl   (%eax),%ecx	/* recover saved temp */
+	movl   4(%eax),%eax	/* get return address */
+	jmp    *%eax	
+
+
+#endif