p - step
t - trace
pa - step to address
ta - trace to address
pc - step to next call
tc - trace to next call
tb - trace to next branch (只适用于内核调试)
pt - step to next return
tt - trace to next return
ph - step to next branch
th - trace to next branch
wt - trace and watch data
g - go
gh - go handled.(告诉系统已经处理异常)
gn - go not handled.(告诉系统没有处理异常)
gu - go up. (return to current function)