I am trying to debug a Machine Check for a P2010 (e500v2) CPU:
[ 28.111816] Caused by (from MCSR=10008): Bus - Read Data Bus Error
[ 28.117998] Oops: Machine check, sig: 7 [#1]
[ 28.122263] P1010 RDB
[ 28.124529] Modules linked in: linux_bcm_knet(PO) linux_user_bde(PO)
linux_kernel_bde(PO)
[ 28.132718] CPU: 0 PID: 470 Comm: emxp2_hw_bl Tainted: P O
4.1.38+ #49
[ 28.140376] task: db16cd10 ti: df128000 task.ti: df128000
[ 28.145770] NIP: 00000000 LR: 10a4e404 CTR: 10046c38
[ 28.150730] REGS: df129f10 TRAP: 0204 Tainted: P O (4.1.38+)
[ 28.157776] MSR: 0002d000 <CE,EE,PR,ME> CR: 44002428 XER: 00000000
[ 28.164140] DEAR: b7187000 ESR: 00000000
GPR00: 10a4e404 bf86ea30 b7ca94a0 132f9fa8 07006000 07000000 00000000 132f9fd8
GPR08: b7149000 b7159000 0003e000 bf86ea20 24004424 11d6cf7c 00000000 00000000
GPR16: 10f6e29c 10f6c872 10f6db01 0000b541 0000b541 11d92fcc 00000011 00000001
GPR24: 01a4d12d 132ffbf0 11d60000 00000000 07006000 00000000 132f9fa8 00000000
[ 28.196375] NIP [00000000] (null)
[ 28.199859] LR [10a4e404] 0x10a4e404
[ 28.203426] Call Trace:
[ 28.205866] ---[ end trace f456255ddf9bee83 ]---
I cannot figure out why NIP is NULL ? It LOOKs like NIP is set to
MCSRR0 early on but maybe it is lost somehow?
Anyhow, looking at entry_32.S:
.globl mcheck_transfer_to_handler
mcheck_transfer_to_handler:
mfspr r0,SPRN_DSRR0
stw r0,_DSRR0(r11)
mfspr r0,SPRN_DSRR1
stw r0,_DSRR1(r11)
/* fall through */
.globl debug_transfer_to_handler
debug_transfer_to_handler:
mfspr r0,SPRN_CSRR0
stw r0,_CSRR0(r11)
mfspr r0,SPRN_CSRR1
stw r0,_CSRR1(r11)
/* fall through */
.globl crit_transfer_to_handler
crit_transfer_to_handler:
It looks odd that DSRRx is assigned in mcheck and CSRRx in debug and
crit has none. Should not this assigment be shifted down one level?
Jocke
