gdb笔记
i reg 看寄存器 info
bt full backtrace
p $eax print
print有各种格式，p/x 16进制，p/o 8进制,p/s 字符
x/格式 地址
x $pc pc为程序指针也叫eip
x/i $pc 汇编指令 ★★★★★★★★★★
disas $pc disassemble 反汇编命令

(gdb) i regeax            0xfffffdfe       -514ecx            0x8      8edx            0xb74c0ff4       -1219751948ebx            0xbfe34850       -1075623856esp            0xbfe347e0       0xbfe347e0ebp            0x85f1968        0x85f1968esi            0x1      1edi            0x85f08a8        140445864eip            0xb7721424       0xb7721424 <__kernel_vsyscall+16>eflags         0x200246 [ PF ZF IF ID ]cs             0x73     115ss             0x7b     123ds             0x7b     123es             0x7b     123fs             0x0      0gs             0x33     51(gdb) p $eax$1 = -514(gdb) p/x $eax$2 = 0xfffffdfe(gdb) p/d $eax$3 = -514(gdb) p/u $eax$4 = 4294966782(gdb) p/o $eax$5 = 037777776776(gdb) p/t $eax$6 = 11111111111111111111110111111110(gdb) p/c $eax$7 = -2 '\376'(gdb) p/f $eax$8 = -nan(0x7ffdfe)(gdb) p/s $eax$9 = -514(gdb) p/i $eaxFormat letter "i" is meaningless in "print" command.(gdb)