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移除书签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：
1. ##################excFrom: User!####################
2. prefetch_abort fault fsr:0x5, far:0x00000000
3. Translation fault, section
4. excType: prefetch abort
5. processName = shell
6. processID = 3
7. process aspace = 0x01000000 -> 0x3f000000
8. taskName = shell
9. taskID = 4
10. task user stack = 0x3707d000 -> 0x3717d000
11. pc = 0x0
12. ulr = 0x2000424 in /bin/shell ---> 0x424
13. usp = 0x3717cd60fp = 0x3717cd64
14. R0 = 0x1
15. R1 = 0x0
16. R2 = 0x0
17. R3 = 0x1
18. R4 = 0x3717cf58
19. R5 = 0x0
20. R6 = 0x3717cf54
21. R7 = 0x200043c
22. R8 = 0x84
23. R9 = 0x229a7560
24. R10 = 0x0
25. R11 = 0x3717cd64
26. R12 = 0x0
27. CPSR = 0x40000030
28. *******backtrace begin*******
29. traceback 0 -- lr = 0x229123a4 fp = 0x0 lr in /lib/libc.so --> 0x213a4
31. PID PPID PGID UID Status CPUUSE CPUUSE10s CPUUSE1s Policy Priority MTID TaskTotal Mode PName
32. 1 -1 1 0 Ready 0.0 0.0 0.0 RR 28 16 1 user init
33. 2 -1 2 0 Pend 10.1 10.1 0.0 RR 0 0 14 kernel KProcess
34. 3 1 3 0 Running 0.0 0.0 0.0 RR 28 4 1 user shell
36. TID PID Status StackSize WaterLine Policy Priority MEMUSE TaskName
37. 16 1 Ready 0x3000 0x978 RR 31 0x8b0c init
38. 0 2 Pend 0x1000 0x1d4 RR 5 0 ResourcesTask
39. 2 2 Pend 0x4000 0x4ec RR 0 0 Swt_Task
40. 3 2 Pend 0x4000 0x1d4 RR 1 0 system_wq
41. 5 2 Pend 0x4000 0x1fc RR 9 0 SendToSer
42. 6 2 PendTime 0x6000 0x204 RR 5 0 tcpip_thread
43. 7 2 Pend 0x3000 0x1fc RR 5 0 sdmci_detect
44. 8 2 Pend 0x4000 0x204 RR 5 0 USB_GIANT_Task
45. 9 2 Pend 0x4000 0x204 RR 1 0 USB_NGIAN_ISOC_Task
46. 10 2 Pend 0x4000 0x204 RR 2 0 USB_NGIAN_BULK_Task
47. 11 2 Pend 0x4000 0x690 RR 5 0xbb0 USB_EXPLR_Task
48. 12 2 Pend 0x4000 0x204 RR 5 0 USB_CXFER_Task
49. 13 2 Pend 0x20000 0x1e4 RR 3 0xac20 eth_irq_Task
50. 14 2 Pend 0x4000 0x1d4 RR 10 0 jffs2_gc_thread
51. 15 2 Pend 0x2000 0x1f4 RR 4 0 hisi_frw
52. 4 3 Running 0x3000 0x838 RR 31 0x1100 shell
53. 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：
1. prefetch_abort fault fsr:0x5, far:0x00000000
2. Translation fault, section
3. excType: prefetch abort
4. processName = shell
5. processID = 3
6. process aspace = 0x01000000 -> 0x3f000000
7. taskName = shell
8. taskID = 4
9. task user stack = 0x3707d000 -> 0x3717d000
- 寄存器相关信息。
1. pc = 0x0
2. ulr = 0x2000424 in /bin/shell ---> 0x424
3. usp = 0x3717cd60fp = 0x3717cd64
4. R0 = 0x1
5. R1 = 0x0
6. R2 = 0x0
7. R3 = 0x1
8. R4 = 0x3717cf58
9. R5 = 0x0
10. R6 = 0x3717cf54
11. R7 = 0x200043c
12. R8 = 0x84
13. R9 = 0x229a7560
14. R10 = 0x0
15. R11 = 0x3717cd64
16. R12 = 0x0
17. CPSR = 0x40000030
- 调用栈信息。
1. *******backtrace begin*******
2. traceback 0 -- lr = 0x229123a4 fp = 0x0 lr in /lib/libc.so --> 0x213a4
- 进程线程基本信息。
1. PID PPID PGID UID Status CPUUSE CPUUSE10s CPUUSE1s Policy Priority MTID TaskTotal Mode PName
2. 1 -1 1 0 Ready 0.0 0.0 0.0 RR 28 16 1 user init
3. 2 -1 2 0 Pend 10.1 10.1 0.0 RR 0 0 14 kernel KProcess
4. 3 1 3 0 Running 0.0 0.0 0.0 RR 28 4 1 user shell
6. TID PID Status StackSize WaterLine Policy Priority MEMUSE TaskName
7. 16 1 Ready 0x3000 0x978 RR 31 0x8b0c init
8. 0 2 Pend 0x1000 0x1d4 RR 5 0 ResourcesTask
9. 2 2 Pend 0x4000 0x4ec RR 0 0 Swt_Task
10. 3 2 Pend 0x4000 0x1d4 RR 1 0 system_wq
11. 5 2 Pend 0x4000 0x1fc RR 9 0 SendToSer
12. 6 2 PendTime 0x6000 0x204 RR 5 0 tcpip_thread
13. 7 2 Pend 0x3000 0x1fc RR 5 0 sdmci_detect
14. 8 2 Pend 0x4000 0x204 RR 5 0 USB_GIANT_Task
15. 9 2 Pend 0x4000 0x204 RR 1 0 USB_NGIAN_ISOC_Task
16. 10 2 Pend 0x4000 0x204 RR 2 0 USB_NGIAN_BULK_Task
17. 11 2 Pend 0x4000 0x690 RR 5 0xbb0 USB_EXPLR_Task
18. 12 2 Pend 0x4000 0x204 RR 5 0 USB_CXFER_Task
19. 13 2 Pend 0x20000 0x1e4 RR 3 0xac20 eth_irq_Task
20. 14 2 Pend 0x4000 0x1d4 RR 10 0 jffs2_gc_thread
21. 15 2 Pend 0x2000 0x1f4 RR 4 0 hisi_frw
22. 4 3 Running 0x3000 0x838 RR 31 0x1100 shell
23. 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。
