1 files changed, 91 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/frame.inc b/arch/mn10300/include/asm/frame.inc
new file mode 100644
index 0000000..5b1949b
--- /dev/null
+++ b/arch/mn10300/include/asm/frame.inc
@@ -0,0 +1,91 @@
+/* MN10300 Microcontroller core system register definitions -*- asm -*-
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _ASM_FRAME_INC
+#define _ASM_FRAME_INC
+
+#ifndef __ASSEMBLY__
+#error not for use in C files
+#endif
+
+#ifndef __ASM_OFFSETS_H__
+#include <asm/asm-offsets.h>
+#endif
+
+#define pi break
+
+#define fp a3
+
+###############################################################################
+#
+# build a stack frame from the registers
+# - the caller has subtracted 4 from SP before coming here
+#
+###############################################################################
+.macro SAVE_ALL
+	add	-4,sp				# next exception frame ptr save area
+	movm	[other],(sp)
+	mov	usp,a1
+	mov	a1,(sp)				# USP in MOVM[other] dummy slot
+	movm	[d2,d3,a2,a3,exreg0,exreg1,exother],(sp)
+	mov	sp,fp				# FRAME pointer in A3
+	add	-12,sp				# allow for calls to be made
+	mov	(__frame),a1
+	mov	a1,(REG_NEXT,fp)
+	mov	fp,(__frame)
+
+	and	~EPSW_FE,epsw			# disable the FPU inside the kernel
+
+	# we may be holding current in E2
+#ifdef CONFIG_MN10300_CURRENT_IN_E2
+	mov	(__current),e2
+#endif
+.endm
+
+###############################################################################
+#
+# restore the registers from a stack frame
+#
+###############################################################################
+.macro RESTORE_ALL
+	# peel back the stack to the calling frame
+	# - this permits execve() to discard extra frames due to kernel syscalls
+	mov	(__frame),fp
+	mov	fp,sp
+	mov	(REG_NEXT,fp),d0                # userspace has regs->next == 0
+	mov	d0,(__frame)
+
+#ifndef CONFIG_MN10300_USING_JTAG
+	mov	(REG_EPSW,fp),d0
+	btst	EPSW_T,d0
+	beq	99f
+
+	or	EPSW_NMID,epsw
+	movhu	(DCR),d1
+	or	0x0001, d1
+	movhu	d1,(DCR)
+
+99:
+#endif
+	movm	(sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
+
+	# must restore usp even if returning to kernel space,
+	# when CONFIG_PREEMPT is enabled.
+	mov	(sp),a1				# USP in MOVM[other] dummy slot
+	mov	a1,usp
+
+	movm	(sp),[other]
+	add	8,sp
+	rti
+
+.endm
+
+
+#endif /* _ASM_FRAME_INC */