How can I make GDB print 64 bit variables?

问题

I'm using GDB to debug code that was assembled with

nasm -felf64 -Fdwarf

when I want to examine the value at a label symbol, say

var_h: dq -1

using

print var_h

GDB assumes that the value is 32-bit and only gives me the lowest 4 bytes

x \1gx $var_h

gives an error along the lines of "cannot convert value to integer'

Very grateful for any ideas!

回答1:

This should work:

(gdb) x/gx &var_h

Your other commands, as well as "along the lines of ..." make no sense.

Details matter, and you should always show actual commands you used and output you received, not vague approximations thereof.

来源：https://stackoverflow.com/questions/49956000/how-can-i-make-gdb-print-64-bit-variables