1 files changed, 93 insertions, 0 deletions
diff --git a/sys/arm/arm/setstack.S b/sys/arm/arm/setstack.S
new file mode 100644
index 000000000000..0e84334d94cc
--- /dev/null
+++ b/sys/arm/arm/setstack.S
@@ -0,0 +1,93 @@
+/*	$NetBSD: setstack.S,v 1.1 2001/07/28 13:28:03 chris Exp $	*/
+
+/*-
+ * Copyright (c) 1994 Mark Brinicombe.
+ * Copyright (c) 1994 Brini.
+ * All rights reserved.
+ *
+ * This code is derived from software written for Brini by Mark Brinicombe
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Brini.
+ * 4. The name of the company nor the name of the author may be used to
+ *    endorse or promote products derived from this software without specific
+ *    prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
+ *
+ * RiscBSD kernel project
+ *
+ * setstack.S
+ *
+ * Miscellaneous routine to play with the stack pointer in different CPU modes
+ *
+ * Eventually this routine can be inline assembly.
+ *
+ * Created      : 17/09/94
+ *
+ * Based of kate/display/setstack.s
+ *
+ */
+
+#include <machine/asm.h>
+#include <machine/armreg.h>
+
+/* To set the stack pointer for a particular mode we must switch
+ * to that mode update the banked r13 and then switch back.
+ * This routine provides an easy way of doing this for any mode
+ *
+ * r0 = CPU mode
+ * r1 = stackptr
+ */
+
+ENTRY(set_stackptr)
+        mrs	r3, cpsr		/* Switch to the appropriate mode */
+	bic	r2, r3, #(PSR_MODE)
+	orr	r2, r2, r0
+        msr	cpsr_fsxc, r2
+
+	mov	sp, r1			/* Set the stack pointer */
+
+        msr	cpsr_fsxc, r3		/* Restore the old mode */
+
+	mov	pc, lr			/* Exit */
+END(set_stackptr)
+/* To get the stack pointer for a particular mode we must switch
+ * to that mode copy the banked r13 and then switch back.
+ * This routine provides an easy way of doing this for any mode
+ *
+ * r0 = CPU mode
+ */
+
+ENTRY(get_stackptr)
+        mrs	r3, cpsr		/* Switch to the appropriate mode */
+	bic	r2, r3, #(PSR_MODE)
+	orr	r2, r2, r0
+        msr	cpsr_fsxc, r2
+
+	mov	r0, sp			/* Set the stack pointer */
+
+        msr	cpsr_fsxc, r3		/* Restore the old mode */
+
+	mov	pc, lr			/* Exit */
+END(get_stackptr)
+/* End of setstack.S */