Here is Problem 4.6, for reference:

4.43 In Section 3.4.2, the IA32 pushl instruction was described as decrementing the stack pointer and then storing the register at the stack pointer location. So, if we had an instruction of the form pushl REG, for some register REG, it would be equivalent to the code sequence: subl $4,%esp movl REG, (esp) Decrement stack pointer Store REG on stack A. In light of analysis done in Problem 4.6, does this code sequence correctly describe the behavior of the instruction pushl %esp? Explain. B. How could you rewrite the code sequence so that it correctly describes both the cases where REG is %esp as well as any other register? 4.43 In Section 3.4.2, the IA32 pushl instruction was described as decrementing the stack pointer and then storing the register at the stack pointer location. So, if we had an instruction of the form pushl REG, for some register REG, it would be equivalent to the code sequence: subl $4,%esp movl REG, (esp) Decrement stack pointer Store REG on stack A. In light of analysis done in Problem 4.6, does this code sequence correctly describe the behavior of the instruction pushl %esp? Explain. B. How could you rewrite the code sequence so that it correctly describes both the cases where REG is %esp as well as any other register