cm_backtrace怎么定位Usage fault问题点呢

发布于 2020-07-10 16:11:24 浏览：1430 订阅该版

PC和LR指针都变成0了，backtrace提示问题出现在中断中，但是usage fault类型的错误backtrace没给出函数调用关系(`print_call_stack()`应该是内部有些判断没处理到)

以下是打印log

-----------
```c
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
sock       8  suspend 0x000001a8 0x00000400    64%   0x00000006 000
uart1      8  suspend 0x000000d4 0x00000400    79%   0x0000000a 000
tshell    20  suspend 0x000000f4 0x00001000    05%   0x0000000a 000
sys_work  23  suspend 0x0000005c 0x00000800    42%   0x00000009 000
tcpip     10  suspend 0x00000098 0x00000400    57%   0x00000010 000
etx       12  suspend 0x0000007c 0x00000400    17%   0x00000004 000
erx       12  suspend 0x00000084 0x00000400    44%   0x00000009 000
ulog_asy  30  suspend 0x00000070 0x00000400    21%   0x00000012 000
tidle0    31  running 0x00000058 0x00000100    43%   0x0000000e 000
timer      4  suspend 0x00000058 0x00000200    22%   0x00000009 000
main      10  suspend 0x00000188 0x00000800    56%   0x0000000a 000
[1010883] E/cmb: 
[1010883] E/cmb: Firmware name: rtthread, hardware version: 1.0, software version: 1.0
[1010883] E/cmb: Fault on interrupt or bare metal(no OS) environment
[1010883] E/cmb: ===== Thread stack information =====
[1010883] E/cmb:   addr: 24000af0    data: 24001134
[1010883] E/cmb:   addr: 24000af4    data: deadbeef
[1010883] E/cmb:   addr: 24000af8    data: 00000000
[1010883] E/cmb:   addr: 24000afc    data: 24000ea4
[1010883] E/cmb:   addr: 24000b00    data: 00000000
[1010883] E/cmb:   addr: 24000b04    data: 6c4a971c
[1010883] E/cmb:   addr: 24000b08    data: 00000000
[1010883] E/cmb:   addr: 24000b0c    data: 9000486f
[1010883] E/cmb:   addr: 24000b10    data: 900286b6
[1010883] E/cmb:   addr: 24000b14    data: 0100000f
[1010883] E/cmb:   addr: 24000b18    data: 00000000
[1010883] E/cmb:   addr: 24000b1c    data: 24000ea4
[1010883] E/cmb:   addr: 24000b20    data: 24013244
[1010883] E/cmb:   addr: 24000b24    data: 24013230
[1010883] E/cmb:   addr: 24000b28    data: 24000ea4
[1010883] E/cmb:   addr: 24000b2c    data: 9000486f
[1010883] E/cmb:   addr: 24000b30    data: 00000004
[1010883] E/cmb:   addr: 24000b34    data: 24000d1c
[1010883] E/cmb:   addr: 24000b38    data: deadbeef
[1010883] E/cmb:   addr: 24000b3c    data: deadbeef
[1010883] E/cmb:   addr: 24000b40    data: deadbeef
[1010883] E/cmb:   addr: 24000b44    data: deadbeef
[1010883] E/cmb:   addr: 24000b48    data: deadbeef
[1010883] E/cmb:   addr: 24000b4c    data: 9002650f
[1010883] E/cmb:   addr: 24000b50    data: 00000000
[1010883] E/cmb:   addr: 24000b54    data: fffffffd
[1010883] E/cmb:   addr: 24000b58    data: 24000b7c
[1010883] E/cmb:   addr: 24000b5c    data: 10000000
[1010883] E/cmb:   addr: 24000b60    data: 00000000
[1010883] E/cmb:   addr: 24000b64    data: 00000003
[1010883] E/cmb:   addr: 24000b68    data: 00000020
[1010883] E/cmb:   addr: 24000b6c    data: 90001967
[1010883] E/cmb:   addr: 24000b70    data: 900003d6
[1010883] E/cmb:   addr: 24000b74    data: 21000200
[1010883] E/cmb:   addr: 24000b78    data: 90026113
[1010883] E/cmb: ====================================
[1010883] E/cmb: =================== Registers information ====================
[1010883] E/cmb:   R0 : fffffff1  R1 : fffffff1  R2 : 00000000  R3 : 240003bc
[1010883] E/cmb:   R12: 240003bc  LR : 00000000  PC : 00000000  PSR: 7ffffffe
[1010883] E/cmb: ==============================================================
[1010883] E/cmb: Usage fault is caused by attempts to execute an undefined instruction
```