commit 7c7a23bd5a0bc149d2edd665ec46381726b24e0c
author wdenk <wdenk> Sat Dec 07 00:20:59 2002 +0000
committer wdenk <wdenk> Sat Dec 07 00:20:59 2002 +0000
tree d859f82ea2561180db2ffd7569f0b9007d710769
parent 1f53a41603b9093c59741f4208fef0ab3790d6ce

* Patch by Hans-Joerg Frieden, 06 Dec 2002
  Fix misc problems with AmigaOne support

* 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 Müller, 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/ppc4xx/start.S

diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index baaaba4..c40a8db 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -775,7 +775,14 @@
 	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
@@ -800,7 +807,9 @@
 	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)
@@ -808,8 +817,13 @@
 	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(0xd00, SingleStep, UnknownException)