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Let us determine the behavior of the instruction pushq % rsp for an x 8 6 - 6 4 processor. We could try reading the
Let us determine the behavior of the instruction pushq rsp for an x processor. We could try reading the Intel documentation on this instruction, but a simpler approach is to conduct an experiment on an actual machine. The C compiler would not normally generate this instruction, so we must use handgenerated assembly code for this task. Here is a test function we have written Web Aside asm:easm on page describes how to write programs that combine C code with handwritten assembly code:
text
globl pushtest
pushtest:
movq rsprax Copy stack pointer
pushq rsp Push stack pointer
Popd rdx Pop it back
subq rdxrax Return or
ret
In our experiments, we find that function pushtest always returns What does this imply about the behavior of the instruction pushq rsp under x
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