From 7c7a23bd5a0bc149d2edd665ec46381726b24e0c Mon Sep 17 00:00:00 2001
From: wdenk <wdenk>
Date: Sat, 7 Dec 2002 00:20:59 +0000
Subject: * Patch by Hans-Joerg Frieden, 06 Dec 2002   Fix misc problems with
 AmigaOne support
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* Patch by Chris Hallinan, 3 Dec 2002:
  minor cleanup to the MPC8245 EPIC driver

* Patch by Pierre Aubert , 28 Nov 2002
  Add support for external (SIU) interrupts on MPC8xx

* Patch by Pierre Aubert , 28 Nov 2002
  Fix nested syscalls bug in standalone applications

* Patch by David M�ller, 27 Nov 2002:
  fix output of "pciinfo" command for CardBus bridge devices.

* Fix bug in TQM8260 board detection - boards got stuck when board ID
  was not readable
---
 cpu/mpc824x/start.S | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'cpu/mpc824x/start.S')

diff --git a/cpu/mpc824x/start.S b/cpu/mpc824x/start.S
index bd9706de7c..18b8e61260 100644
--- a/cpu/mpc824x/start.S
+++ b/cpu/mpc824x/start.S
@@ -278,7 +278,14 @@ SystemCall:
 	add	r11,r11,r0
 	lwz	r11,0(r11)
 
-	li	r12,0xd00-4*3		/* save LR & SRRx */
+	li	r20,0xd00-4		/* Get stack pointer */
+	lwz	r12,0(r20)
+	subi	r12,r12,12		/* Adjust stack pointer */
+	li	r0,0xc00+_end_back-SystemCall
+	cmplw	0, r0, r12		/* Check stack overflow */
+	bgt	1f
+	stw	r12,0(r20)
+
 	mflr	r0
 	stw	r0,0(r12)
 	mfspr	r0,SRR0
@@ -303,7 +310,9 @@ _back:
 	mtmsr	r11
 	SYNC
 
-	li	r12,0xd00-4*3		/* restore regs */
+	li	r12,0xd00-4		/* restore regs */
+	lwz	r12,0(r12)
+
 	lwz	r11,0(r12)
 	mtlr	r11
 	lwz	r11,4(r12)
@@ -311,8 +320,13 @@ _back:
 	lwz	r11,8(r12)
 	mtspr	SRR1,r11
 
+	addi	r12,r12,12		/* Adjust stack pointer */
+	li	r20,0xd00-4
+	stw	r12,0(r20)
+
 	SYNC
 	rfi
+_end_back:
 
 	STD_EXCEPTION(EXC_OFF_TRACE, SingleStep, UnknownException)
 
-- 
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