25.3. rvbacktrace_RTThread

25.3.1. 概述

该示例展示了在riscv32机器上，使用frame pointer完成对 RTThread-nano 的线程栈回溯。

25.3.2. 硬件配置

无特殊硬件配置

25.3.3. 运行

一旦此程序正确运行，在console上会输出对应线程的线程栈信息。在finsh中输入 rv_backtrace_all 会输出除当前线程的其他线程栈的信息。

单一线程栈

initialize rti_board_start:0 done

\ | /
- RT -     Thread Operating System
/ | \     3.1.5 build Nov 20 2024
2006 - 2020 Copyright by rt-thread team
do components initialization.
initialize rti_board_end:0 done
initialize finsh_system_init:0 done

---- RV_Backtrace Call Frame Start: ----
###Please consider the value of ra as accurate and the value of sp as only for reference###
----------s--------------------Thread: main backtrace------------------------------
Current Thread Name:  main
[0]Stack interval :[0x10819a0 - 0x10819c0]  ra 0x800103ea
[1]Stack interval :[0x10819c0 - 0x10819d0]  ra 0x8000ff9c
[2]Stack interval :[0x10819d0 - 0x10819e0]  ra 0x80006708
[3]Stack interval :[0x10819e0 - 0x1081a00]  ra 0x800094f6
[4]Stack interval :[0x1081a00 - 0xdeadbeef]  ra 0x8000c65a

addr2line -e xxx.elf -a -f 800103e6 8000ff98 80006704 800094f2 8000c656
---- RV_Backtrace Call Frame End:----

其他线程栈

rv_backtrace_all

---- RV_Backtrace Call Frame Start: ----
------------------------------Thread: event_send backtrace------------------------------
[0]Thread Name:  event_send
[0]Stack interval :[0x108299c - 0x10829cc]  ra 0x8000cb7a
[1]Stack interval :[0x10829cc - 0x10829fc]  ra 0x8000cbdc
[2]Stack interval :[0x10829fc - 0x1082a1c]  ra 0x8000667c
[3]Stack interval :[0x1082a1c - 0xdeadbeef]  ra 0x8000c65a

addr2line -e xxx.elf -a -f 8000cb76 8000cbd8 80006678 8000c656
------------------------------Thread: event_rec backtrace------------------------------
[1]Thread Name:  event_rec
[0]Stack interval :[0x1082504 - 0x1082544]  ra 0x8000a0a6
[1]Stack interval :[0x1082544 - 0x1082574]  ra 0x8000663e
[2]Stack interval :[0x1082574 - 0xdeadbeef]  ra 0x8000c65a

addr2line -e xxx.elf -a -f 8000a0a2 8000663a 8000c656
------------------------------Thread: tidle backtrace------------------------------
[3]Thread Name:  tidle
[0]Stack interval :[0x10804e0 - 0x1080510]  ra 0x800096ee
[1]Stack interval :[0x1080510 - 0xdeadbeef]  ra 0x8000c65a

addr2line -e xxx.elf -a -f 800096ea 8000c656
------------------------------Thread: timer backtrace------------------------------
[4]Thread Name:  timer
[0]Stack interval :[0x1080928 - 0x1080958]  ra 0x8000d8d6
[1]Stack interval :[0x1080958 - 0xdeadbeef]  ra 0x8000c65a

addr2line -e xxx.elf -a -f 8000d8d2 8000c656
Thread Total Num: 5
---- RV_Backtrace Call Frame End:----

25.3.4. 说明

在 backtrace_config.h 中开启 BACKTRACE_ALL 可以回溯除当前线程的其他所有线程栈。
查看函数名调用关系链，需要使用addr2line工具
```
addr2line -e xxx.elf -a -f <addr1> <addr2> ...
```
该组件一般用于软件调试，建议在debug等级下使用