je
if equal then jmp
jg
if the second gt the first, then jmp
jge
if the second ge the first, then jmp
jl
if the second lt the first, then jmp
jle
if the second le the first, then jmp
AT&T 64-bit assembly
how to call library like printf?
The code shows the AT&T assembly on 64-bit Linux.
We use syscall instead of int 0x80.
We save parameters in registers before calling printf, instead of pushing the parameters on the stack.
This is the key:
How to debug assembly program on Linux ?
using gdb
as xx.s -gstabs -o xx.o -gstabs is necessary,otherwise
commands:
run, next, info registers, break num(line number), quit
how to exit program rightly:
movq 1,%rax
int $0x80