xv6 调试技巧-Toy模板网

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url: https://pdos.csail.mit.edu/6.S081/2020/labs/guidance.html

参考链接详细讲了 xv6 调试技巧，认真研读

下面总结重点：

1.运行 debug 模式的方式：
窗口1执行 make qemu-gdb
窗口2执行 gdb-multiarch

如果你想观看内核文件的汇编版本，请查找 kernel.asm

If the kernel panics, it will print an error message listing the value of the program counter when it crashed; you can search kernel.asm to find out in which function the program counter was when it crashed, or you can run addr2line -e kernel/kernel pc-value (run man addr2line for details). If you want to get backtrace, restart using gdb: run ‘make qemu-gdb’ in one window, run gdb (or riscv64-linux-gnu-gdb) in another window, set breakpoint in panic (‘b panic’), followed by followed by ‘c’ (continue). When the kernel hits the break point, type ‘bt’ to get a backtrace.

If your kernel hangs (e.g., due to a deadlock) or cannot execute further (e.g., due to a page fault when executing a kernel instruction), you can use gdb to find out where it is hanging. Run run ‘make qemu-gdb’ in one window, run gdb (riscv64-linux-gnu-gdb) in another window, followed by followed by ‘c’ (continue). When the kernel appears to hang hit Ctrl-C in the qemu-gdb window and type ‘bt’ to get a backtrace.

qemu has a “monitor” that lets you query the state of the emulated machine. You can get at it by typing control-a c (the “c” is for console). A particularly useful monitor command is info mem to print the page table. You may need to use the cpu command to select which core info mem looks at, or you could start qemu with make CPUS=1 qemu to cause there to be just one core.文章来源地址https://www.toymoban.com/news/detail-728263.html

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