* 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
diff --git a/cpu/mpc8xx/start.S b/cpu/mpc8xx/start.S
index a430061..a1b7eff 100644
--- a/cpu/mpc8xx/start.S
+++ b/cpu/mpc8xx/start.S
@@ -285,7 +285,14 @@
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
@@ -310,7 +317,9 @@
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)
@@ -318,8 +327,13 @@
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)