Lab除錯總結

debug開啟

在一個視窗執行make qemu-gdb。
在另一視窗執行gdb-multiarch kernel/kernel，如果要匯入其他debubg的可執行檔案，如除錯find程式，執行file user/_find，之後遠端連結gdb，target remote localhost:26000，然後正常除錯。

一些有用的除錯技巧：

分屏

Change the layout of windows.
Usage: layout prev | next | LAYOUT-NAME

List of layout subcommands:

layout asm -- Apply the "asm" layout.
layout next -- Apply the next TUI layout.
layout prev -- Apply the previous TUI layout.
layout regs -- Apply the TUI register layout.
layout split -- Apply the "split" layout.
layout src -- Apply the "src" layout.
 

分屏後窗口聚焦

focus reg -- 聚焦在reg視窗
focus asm -- 聚焦在asm視窗

顯示技巧

set print address on -- 檢視地址
set print array on -- 陣列顯示
set print pretty on -- 結構體內容顯示

info顯示資訊

info breakpoints(info b) -- Status of specified breakpoints (all user-settable breakpoints if no argument).
info registers(info r) -- List of integer registers and their contents, for selected stack frame.
 

delete

delete breakpoints -- Delete all or some breakpoints or auto-display expressions.

GDB的內建手冊

apropos -- Search for commands matching a REGEXP.