函数调用和撤消功能

问题描述

我知道call / ret是在内部完成的，但是我想了解更多有关如何在汇编代码中进行翻译的知识。这是我到目前为止为call准备的东西：

# Verbose way of doing `call func`

lea (%rip),%rax   # get the current %rip. It cannot be directly accessed,so need to do a roundabout way
add $14,%rax      # Now that we have the prevIoUs %rip address in a register,add the offset to after the jmp
sub $8,%rsp       # do pop %rax to move the value in the register onto the stack
mov %rax,(%rsp)   #    ... (doing it verbosely)
jmp func           # jump to the function label

对于ret：

 func:
     nop                 # pretend we did something in the function

     # Verbose way of returning from a function,`ret`
     mov (%rsp),%r11    # move the memory address stored at the top of the stack into %r11
     add $8,%rsp        # move the stack pointer back to where we started from
     jmp %r11            # jump to the return address,Now held in %r11

call / ret的作用差不多吗？

解决方法

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