技巧
用gdb调试程序时，如果想查看寄存器的值，可以使用“i registers”命令（i是info命令缩写），例如:
(gdb) i registers
rax 0x7ffff7dd9f60 140737351884640
rbx 0x0 0
rcx 0x0 0
rdx 0x7fffffffe608 140737488348680
rsi 0x7fffffffe5f8 140737488348664
rdi 0x1 1
rbp 0x7fffffffe510 0x7fffffffe510
rsp 0x7fffffffe4c0 0x7fffffffe4c0
r8 0x7ffff7dd8300 140737351877376
r9 0x7ffff7deb9e0 140737351956960
r10 0x7fffffffe360 140737488348000
r11 0x7ffff7a68be0 140737348275168
r12 0x4003e0 4195296
r13 0x7fffffffe5f0 140737488348656
r14 0x0 0
r15 0x0 0
rip 0x4004cd 0x4004cd <main+9>
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0以上输出不包括浮点寄存器和向量寄存器的内容。使用“i all-registers”命令，可以输出所有寄存器的内容：
(gdb) i all-registers
rax 0x7ffff7dd9f60 140737351884640
rbx 0x0 0
rcx 0x0 0
rdx 0x7fffffffe608 140737488348680
rsi 0x7fffffffe5f8 140737488348664
rdi 0x1 1
rbp 0x7fffffffe510 0x7fffffffe510
rsp 0x7fffffffe4c0 0x7fffffffe4c0
r8 0x7ffff7dd8300 140737351877376
r9 0x7ffff7deb9e0 140737351956960
r10 0x7fffffffe360 140737488348000
r11 0x7ffff7a68be0 140737348275168
r12 0x4003e0 4195296
r13 0x7fffffffe5f0 140737488348656
r14 0x0 0
r15 0x0 0
rip 0x4004cd 0x4004cd <main+9>
eflags 0x206 [ PF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
st0 0 (raw 0x00000000000000000000)
st1 0 (raw 0x00000000000000000000)
st2 0 (raw 0x00000000000000000000)
st3 0 (raw 0x00000000000000000000)
st4 0 (raw 0x00000000000000000000)
st5 0 (raw 0x00000000000000000000)
st6 0 (raw 0x00000000000000000000)
st7 0 (raw 0x00000000000000000000)
......要打印单个寄存器的值，可以使用“i registers regname”或者“p $regname”，例如：
(gdb) i registers eax
eax 0xf7dd9f60 -136470688
(gdb) p $eax
$1 = -136470688参见gdb手册.
贡献者
nanxiao