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：

  1. 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
  1. 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
  1. 调用栈信息。
  1. *******backtrace begin*******
  2. traceback 0 -- lr = 0x229123a4    fp = 0x0 lr in /lib/libc.so --> 0x213a4
  1. 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。