Assembly Tip

It look like we should not use memory address directly in Assembly. Let's take a look at following example:

movl $0xA9000, %ebx
rdtsc
movl %eax, (%ebx)
movl %edx, 4(%ebx)

It stores the TSC value to memory location 0xA9000.

If I use the memory location directly in the assembly, the code willl not work. 

rdtsc

movl %eax, 0xA9000

movl %edx, 0xA9004