用户态异常信息说明
用户态在运行过程中，可能由于各种原因出现用户态系统异常，异常信息如下所示：
##################excFrom: User!####################
prefetch_abort fault fsr:0x5, far:0x00000000
Translation fault, section
excType: prefetch abort
processName = shell
processID = 3
process aspace = 0x01000000 -> 0x3f000000
taskName = shell
taskID = 4
task user stack = 0x3707d000 -> 0x3717d000
pc = 0x0
ulr = 0x2000424 in /bin/shell ---> 0x424
usp = 0x3717cd60fp = 0x3717cd64
R0 = 0x1
R1 = 0x0
R2 = 0x0
R3 = 0x1
R4 = 0x3717cf58
R5 = 0x0
R6 = 0x3717cf54
R7 = 0x200043c
R8 = 0x84
R9 = 0x229a7560
R10 = 0x0
R11 = 0x3717cd64
R12 = 0x0
CPSR = 0x40000030
***backtrace begin***
traceback 0 -- lr = 0x229123a4 fp = 0x0 lr in /lib/libc.so --> 0x213a4
PID PPID PGID UID Status CPUUSE CPUUSE10s CPUUSE1s Policy Priority MTID TaskTotal Mode PName
1 -1 1 0 Ready 0.0 0.0 0.0 RR 28 16 1 user init
2 -1 2 0 Pend 10.1 10.1 0.0 RR 0 0 14 kernel KProcess
3 1 3 0 Running 0.0 0.0 0.0 RR 28 4 1 user shell
TID PID Status StackSize WaterLine Policy Priority MEMUSE TaskName
16 1 Ready 0x3000 0x978 RR 31 0x8b0c init
0 2 Pend 0x1000 0x1d4 RR 5 0 ResourcesTask
2 2 Pend 0x4000 0x4ec RR 0 0 Swt_Task
3 2 Pend 0x4000 0x1d4 RR 1 0 system_wq
5 2 Pend 0x4000 0x1fc RR 9 0 SendToSer
6 2 PendTime 0x6000 0x204 RR 5 0 tcpip_thread
7 2 Pend 0x3000 0x1fc RR 5 0 sdmci_detect
8 2 Pend 0x4000 0x204 RR 5 0 USB_GIANT_Task
9 2 Pend 0x4000 0x204 RR 1 0 USB_NGIAN_ISOC_Task
10 2 Pend 0x4000 0x204 RR 2 0 USB_NGIAN_BULK_Task
11 2 Pend 0x4000 0x690 RR 5 0xbb0 USB_EXPLR_Task
12 2 Pend 0x4000 0x204 RR 5 0 USB_CXFER_Task
13 2 Pend 0x20000 0x1e4 RR 3 0xac20 eth_irq_Task
14 2 Pend 0x4000 0x1d4 RR 10 0 jffs2_gc_thread
15 2 Pend 0x2000 0x1f4 RR 4 0 hisi_frw
4 3 Running 0x3000 0x838 RR 31 0x1100 shell
system memcheck over, all passed!
其中，主要包含如下几方面信息：
-
用户态异常基本信息：
prefetch_abort fault fsr:0x5, far:0x00000000 Translation fault, section excType: prefetch abort processName = shell processID = 3 process aspace = 0x01000000 -> 0x3f000000 taskName = shell taskID = 4 task user stack = 0x3707d000 -> 0x3717d000 -
寄存器相关信息。
pc = 0x0 ulr = 0x2000424 in /bin/shell ---> 0x424 usp = 0x3717cd60fp = 0x3717cd64 R0 = 0x1 R1 = 0x0 R2 = 0x0 R3 = 0x1 R4 = 0x3717cf58 R5 = 0x0 R6 = 0x3717cf54 R7 = 0x200043c R8 = 0x84 R9 = 0x229a7560 R10 = 0x0 R11 = 0x3717cd64 R12 = 0x0 CPSR = 0x40000030 -
调用栈信息。
***backtrace begin*** traceback 0 -- lr = 0x229123a4 fp = 0x0 lr in /lib/libc.so --> 0x213a4 -
进程线程基本信息。
PID PPID PGID UID Status CPUUSE CPUUSE10s CPUUSE1s Policy Priority MTID TaskTotal Mode PName 1 -1 1 0 Ready 0.0 0.0 0.0 RR 28 16 1 user init 2 -1 2 0 Pend 10.1 10.1 0.0 RR 0 0 14 kernel KProcess 3 1 3 0 Running 0.0 0.0 0.0 RR 28 4 1 user shell TID PID Status StackSize WaterLine Policy Priority MEMUSE TaskName 16 1 Ready 0x3000 0x978 RR 31 0x8b0c init 0 2 Pend 0x1000 0x1d4 RR 5 0 ResourcesTask 2 2 Pend 0x4000 0x4ec RR 0 0 Swt_Task 3 2 Pend 0x4000 0x1d4 RR 1 0 system_wq 5 2 Pend 0x4000 0x1fc RR 9 0 SendToSer 6 2 PendTime 0x6000 0x204 RR 5 0 tcpip_thread 7 2 Pend 0x3000 0x1fc RR 5 0 sdmci_detect 8 2 Pend 0x4000 0x204 RR 5 0 USB_GIANT_Task 9 2 Pend 0x4000 0x204 RR 1 0 USB_NGIAN_ISOC_Task 10 2 Pend 0x4000 0x204 RR 2 0 USB_NGIAN_BULK_Task 11 2 Pend 0x4000 0x690 RR 5 0xbb0 USB_EXPLR_Task 12 2 Pend 0x4000 0x204 RR 5 0 USB_CXFER_Task 13 2 Pend 0x20000 0x1e4 RR 3 0xac20 eth_irq_Task 14 2 Pend 0x4000 0x1d4 RR 10 0 jffs2_gc_thread 15 2 Pend 0x2000 0x1f4 RR 4 0 hisi_frw 4 3 Running 0x3000 0x838 RR 31 0x1100 shell system memcheck over, all passed!可以根据以上信息，分析用户态异常的具体原因。