Stack in Memory and Registers

Learn how to implement a stack, call a stack, and use jumps in memory and registers.

Register review

We know the following general-purpose CPU registers:

  • %RAX (among its specific uses is to contain function return values)
  • %RBX
  • %RCX
  • %RDX

We also have special purpose registers:

  • %RIP (Instruction Pointer)
  • %RSP (Stack Pointer)

AMD64 and Intel EM64T architectures introduced additional general-purpose registers—%R8, %R9, %R10, %R11, %R12, %R13, %R14, %R15.

These additional registers are used a lot in x6464 code. More general-purpose registers allow faster code execution because temporary computation results can be stored there instead of in-memory locations. Here is a disassembly of the read function:

(gdb) disass read

The dump of the read function is given below:

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