1 files changed, 86 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/gba/startup/cpu_asm.S b/c/src/lib/libbsp/arm/gba/startup/cpu_asm.S
new file mode 100644
index 0000000000..d4ea836960
--- /dev/null
+++ b/c/src/lib/libbsp/arm/gba/startup/cpu_asm.S
@@ -0,0 +1,86 @@
+/**
+ *  @file cpu_asm.S
+ *
+ *  This file contains the implementation of exception handlers.
+ */
+/*
+ *  RTEMS GBA BSP
+ *
+ *  Copyright (c) 2002 by Advent Networks, Inc.
+ *      Jay Monkman <jmonkman@adventnetworks.com>
+ *
+ *  COPYRIGHT (c) 2000 Canon Research Centre France SA.
+ *      Emmanuel Raguet, mailto:raguet@crf.canon.fr
+ *
+ *  Copyright (c) 2004
+ *      Markku Puro <markku.puro@kopteri.net>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#define __asm__
+#include <rtems/asm.h>
+#include <rtems/score/cpu_asm.h>
+#include <asm_macros.h>
+/* @cond  INCLUDE_ASM */
+
+/**
+ *  This routine performs a normal non-FP context.
+ *  function void _CPU_Context_switch( run_context, heir_context )
+ *  R0 = run_context    R1 = heir_context
+ *
+ *  This function copies the current registers to where r0 points, then
+ *  restores the ones from where r1 points.
+ *
+ *  Using the ldm/stm opcodes save 2-3 us on 100 MHz ARM9TDMI with
+ *  a 16 bit data bus.
+ *
+ */
+    .align
+/* .section  .iwram   */
+PUBLIC_ARM_FUNCTION(_CPU_Context_switch)
+/* Start saving context */
+	mrs	r2, cpsr
+	stmia	r0,  {r2, r4, r5, r6, r7, r8, r9, r10, r11, r13, r14}
+/* Start restoring context */
+_restore:
+	ldmia	r1,  {r2, r4, r5, r6, r7, r8, r9, r10, r11, r13, r14}
+	msr	cpsr, r2
+	mov	pc, lr
+LABEL_END(_CPU_Context_switch)
+
+/**
+ * This function copies the restores the registers from where r0 points.
+ * function void _CPU_Context_restore( new_context )
+ * It must match _CPU_Context_switch()
+ *
+ */
+PUBLIC_ARM_FUNCTION(_CPU_Context_restore)
+        mov     r1, r0
+        b       _restore
+LABEL_END(_CPU_Context_restore)
+
+/**
+ * function _Exception_Handler_Undef_Swi
+ * Can't use exception vectors in GBA
+ * @todo  _Exception_Handler_Undef_Swi: Unused handler needed by ../score/cpu_asm.S
+ *
+ */
+        .global _Exception_Handler_Undef_Swi
+_Exception_Handler_Undef_Swi:
+	mov	pc, lr
+
+/**
+ * function _Exception_Handler_Abort
+ * Can't use exception vectors in GBA
+ * @todo  _Exception_Handler_Abort: Unused handler needed by ../score/cpu_asm.S
+ *
+ */
+        .global _Exception_Handler_Abort
+_Exception_Handler_Abort:
+	mov	pc, lr
+/* @endcond     */