From acc25eec35e186abc118b9ca4f097e22fc6b4846 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Thu, 2 Dec 1999 14:31:19 +0000
Subject: Merged of mcp750 and mvme2307 BSP by Eric Valette
 <valette@crf.canon.fr>. As part of this effort, the mpc750 libcpu code is now
 shared with the ppc6xx.

---
 .../cpu/powerpc/old_exception_processing/rtems.S   | 132 +++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 c/src/exec/score/cpu/powerpc/old_exception_processing/rtems.S

(limited to 'c/src/exec/score/cpu/powerpc/old_exception_processing/rtems.S')

diff --git a/c/src/exec/score/cpu/powerpc/old_exception_processing/rtems.S b/c/src/exec/score/cpu/powerpc/old_exception_processing/rtems.S
new file mode 100644
index 0000000000..b653152411
--- /dev/null
+++ b/c/src/exec/score/cpu/powerpc/old_exception_processing/rtems.S
@@ -0,0 +1,132 @@
+/*  rtems.s
+ *
+ *  This file contains the single entry point code for
+ *  the PowerPC implementation of RTEMS.
+ *
+ *  Author:	Andrew Bray <andy@i-cubed.co.uk>
+ *
+ *  COPYRIGHT (c) 1995 by i-cubed ltd.
+ *
+ *  To anyone who acknowledges that this file is provided "AS IS"
+ *  without any express or implied warranty:
+ *      permission to use, copy, modify, and distribute this file
+ *      for any purpose is hereby granted without fee, provided that
+ *      the above copyright notice and this notice appears in all
+ *      copies, and that the name of i-cubed limited not be used in
+ *      advertising or publicity pertaining to distribution of the
+ *      software without specific, written prior permission.
+ *      i-cubed limited makes no representations about the suitability
+ *      of this software for any purpose.
+ *
+ *  Derived from c/src/exec/cpu/no_cpu/rtems.c:
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <asm.h>
+
+	BEGIN_CODE
+/*
+ *  RTEMS
+ *
+ *  This routine jumps to the directive indicated in r11.
+ *  This routine is used when RTEMS is linked by itself and placed
+ *  in ROM.  This routine is the first address in the ROM space for
+ *  RTEMS.  The user "calls" this address with the directive arguments
+ *  in the normal place.
+ *  This routine then jumps indirectly to the correct directive
+ *  preserving the arguments.  The directive should not realize
+ *  it has been "wrapped" in this way.  The table "_Entry_points"
+ *  is used to look up the directive.
+ */
+
+	ALIGN (4, 2)
+	PUBLIC_PROC (RTEMS)
+PROC (RTEMS):
+#if (PPC_ABI == PPC_ABI_POWEROPEN)
+	mflr	r0
+	stw	r0, 8(r1)
+	stwu	r1, -64(r1)
+
+	/* Establish addressing */
+	bl	base
+base:
+	mflr	r12
+	addi	r12, r12, tabaddr - base
+
+	lwz	r12, Entry_points-abase(r12)
+	slwi	r11, r11, 2
+	lwzx	r12, r12, r11
+
+	stw	r2, 56(r1)
+	lwz	r0, 0(r12)
+	mtlr	r0
+	lwz	r2, 4(r12)
+	lwz	r11, 8(r12)
+	blrl
+	lwz	r2, 56(r1)
+	addi	r1, r1, 64
+	lwz	r0, 8(r1)
+	mtlr	r0
+#else
+	mflr	r0
+	stw	r0, 4(r1)
+	stwu	r1, -16(r1)
+
+	/* Establish addressing */
+	bl	base
+base:
+	mflr	r12
+	addi	r12, r12, tabaddr - base
+
+	lwz	r12, Entry_points-abase(r12)
+	slwi	r11, r11, 2
+	lwzx	r11, r12, r11
+
+	stw	r2, 8(r1)
+#if (PPC_ABI != PPC_ABI_GCC27)
+	stw	r13, 12(r1)
+#endif
+	mtlr	r11
+	lwz	r11, irqinfo-abase(r12)
+	lwz	r2, 0(r11)
+#if (PPC_ABI != PPC_ABI_GCC27)
+	lwz	r13, 4(r11)
+#endif
+	blrl
+	lwz	r2, 8(r1)
+#if (PPC_ABI != PPC_ABI_GCC27)
+	lwz	r13, 12(r1)
+#endif
+	addi	r1, r1, 16
+	lwz	r0, 4(r1)
+	mtlr	r0
+#endif
+	blr
+
+
+	/* Addressability stuff */
+tabaddr:
+abase:
+	EXTERN_VAR (_Entry_points)
+Entry_points:
+	EXT_SYM_REF (_Entry_points)
+#if (PPC_ABI != PPC_ABI_POWEROPEN)
+	EXTERN_VAR (_CPU_IRQ_info)
+irqinfo:
+	EXT_SYM_REF (_CPU_IRQ_info)
+#endif
+
+#if (PPC_ABI == PPC_ABI_POWEROPEN)
+	DESCRIPTOR (RTEMS)
+#endif
+
+
-- 
cgit v1.2.3