nds32: fix panic

Support saving panic data for nds32 core.

Signed-off-by: Dino Li <dino.li@ite.com.tw>

BRANCH=none
BUG=none
TEST=1. console commands 'crash' and 'panicinfo'.
     2. ectool command 'panicinfo'

crash assert

ASSERTION FAILURE '0' in command_crash() at common/panic_output.c:162
=== EXCEP: ITYPE=1 ===
R0  00000000 R1  000000a2 R2  00000060 R3  00000000
R4  00080c40 R5  00000000 R6  dead6663 R7  000000a2
R8  00000002 R9  00000000 R10 00081960 R15 00000000
FP  00000000 GP  000818d8 LP  0000079a SP  00080c60
IPC 000007a2 IPSW   70009
SWID of ITYPE: 0
Software panic reason PANIC_SW_ASSERT
Software panic info 0xa2

Rebooting...

panicinfo
Saved panic data: (NEW)
=== EXCEP: ITYPE=1 ===
R0  00000000 R1  000000a2 R2  00000060 R3  00000000
R4  00080c40 R5  00000000 R6  dead6663 R7  000000a2
R8  00000002 R9  00000000 R10 00081960 R15 00000000
FP  00000000 GP  000818d8 LP  0000079a SP  00080c60
IPC 000007a2 IPSW   70009
SWID of ITYPE: 0
Software panic reason PANIC_SW_ASSERT
Software panic info 0xa2

> crash divzero
=== EXCEP: ITYPE=10003 ===
R0  00000000 R1  00f02705 R2  00000060 R3  00081a09
R4  00000000 R5  00000000 R6  00000001 R7  00080cc0
R8  00000002 R9  00000000 R10 00081961 R15 00000000
FP  00000000 GP  000818d8 LP  00009bce SP  00080c90
IPC 00009bee IPSW   70009
SWID of ITYPE: 1
Exception type: General exception [Arithmetic]
Exception is caused by a data memory access

Rebooting...

panicinfo
Saved panic data: (NEW)
=== EXCEP: ITYPE=10003 ===
R0  00000000 R1  00f02705 R2  00000060 R3  00081a09
R4  00000000 R5  00000000 R6  00000001 R7  00080cc0
R8  00000002 R9  00000000 R10 00081961 R15 00000000
FP  00000000 GP  000818d8 LP  00009bce SP  00080c90
IPC 00009bee IPSW   70009
SWID of ITYPE: 1
Exception type: General exception [Arithmetic]
Exception is caused by a data memory access

> crash stack
+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17

Stack overflow in CONSOLE task!
=== EXCEP: ITYPE=8 ===
R0  00000002 R1  00000002 R2  00000060 R3  00080458
R4  0000ebdd R5  00000000 R6  dead6661 R7  00000002
R8  00000bc8 R9  00000002 R10 00000000 R15 00000000
FP  00000000 GP  000818d8 LP  0000079a SP  00080448
IPC 00000a92 IPSW   70009
SWID of ITYPE: 0
Software panic reason PANIC_SW_STACK_OVERFLOW
Software panic info 0x2

Rebooting...

panicinfo
Saved panic data: (NEW)
=== EXCEP: ITYPE=8 ===
R0  00000002 R1  00000002 R2  00000060 R3  00080458
R4  0000ebdd R5  00000000 R6  dead6661 R7  00000002
R8  00000bc8 R9  00000002 R10 00000000 R15 00000000
FP  00000000 GP  000818d8 LP  0000079a SP  00080448
IPC 00000a92 IPSW   70009
SWID of ITYPE: 0
Software panic reason PANIC_SW_STACK_OVERFLOW
Software panic info 0x2

> crash watchdog
Pre-watchdog warning! IPC: 00009c6c

panicinfo
Saved panic data: (NEW)
=== EXCEP: ITYPE=0 ===
R0  00000000 R1  00000000 R2  00000000 R3  00000000
R4  00000000 R5  00000000 R6  dead6664 R7  00000000
R8  00000000 R9  00000000 R10 00000000 R15 00000000
FP  00000000 GP  00000000 LP  00000000 SP  00000000
IPC 00009c6c IPSW   00000
SWID of ITYPE: 0
Software panic reason PANIC_SW_WATCHDOG
Software panic info 0x0
>

Change-Id: I3d491ecd0789335db4633f9bf2ca09cf85503ed9
Reviewed-on: https://chromium-review.googlesource.com/303286
Commit-Ready: Dino Li <dino.li@ite.com.tw>
Tested-by: Dino Li <dino.li@ite.com.tw>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/chip/it83xx/watchdog.c b/chip/it83xx/watchdog.c
index e6941b1de5..6c15afc60a 100644
--- a/chip/it83xx/watchdog.c
+++ b/chip/it83xx/watchdog.c
@@ -14,6 +14,9 @@
 #include "task.h"
 #include "watchdog.h"
 
+/* Panic data goes at the end of RAM. */
+static struct panic_data * const pdata_ptr = PANIC_DATA_PTR;
+
 /*
  * We use WDT_EXT_TIMER to trigger an interrupt just before the watchdog timer
  * will fire so that we can capture important state information before
@@ -25,6 +28,9 @@
 
 void watchdog_warning_irq(void)
 {
+#ifdef CONFIG_SOFTWARE_PANIC
+	pdata_ptr->nds_n8.ipc = get_ipc();
+#endif
 	/* clear interrupt status */
 	task_clear_pending_irq(et_ctrl_regs[WDT_EXT_TIMER].irq);