X86 ret. .

X86 ret. 1 ret和retf、call指令 ret指令用栈中的数据，修改IP的内 May 14, 2014 · addl $4, %esp CALL，RET和LEAVE CALL指令的步骤：首先是将返回地址（也就是call指令要执行时EIP的值）压入栈顶，然后是将程序跳转到当前调用的方法的起始地址。 执行push和jump指令。 RET指令则是将栈顶的返回地址弹出到EIP，然后按照EIP此时指示的指令地址继续执行 可以看出，调用 leave 后，%rsp 指向的正好是返回地址，x86-64 提供的 ret 指令，其作用就是从当前 %rsp 指向的位置（即栈顶）弹出数据，并跳转到此数据代表的地址处，在leave 执行后，%rsp 指向的正好是返回地址，因而 ret 的作用就是把 %rsp 上移一个位置，并跳转到 Nov 25, 2024 · 学习汇编语言有助于理解计算机底层原理，提升代码效率。本专栏基于王爽老师的《汇编语言》，以8086CPU为例讲解call和ret指令的原理及应用，包括ret、retf、依据位移转移的call等格式，帮助掌握汇编语言的核心概念。 在 x86架构 的汇编语言中，平栈操作通常指保持 ESP （栈指针寄存器）在函数执行前后保持一致。 这是为了维护 调用约定 和确保程序的正确执行。 Nov 21, 2024 · 文章浏览阅读2. Nov 22, 2013 · ret is basically how you write pop eip (or IP / RIP) in x86, so popping into an architectural register and using a register-indirect jump is architecturally equivalent. RET pops the return address off the stack and returns control to that location. Typically, these bytes or words are used as input parameters to the called procedure. The address is usually placed on the stack by a CALL instruction, and the return is made to the instruction that follows the CALL instruction. See the opcode, mnemonic, description, and operation switch for each type of return. This instruction first pops a code location off the hardware supported in-memory stack (see the pop instruction for details). The optional numeric (16- or 32-bit) parameter to ret specifies the number of stack bytes or words to be released after the return address is popped from the stack. . Transfers program control to a return address located on the top of the stack. CALL pushes the return address onto the stack and transfers control to a procedure. Syntax call <label> ret Calling Convention Transfers program control to a return address located on the top of the stack. The ret instruction implements a subroutine return mechanism. 6k次，点赞230次，收藏197次。本文主要探讨汇编中的ret和retf指令以及call指令及其多种转移方式，在其中穿插示例加深理解。_retf指令 for x86 32 bit "The optional numeric (16- or 32-bit) parameter to ret specifies the number of stack bytes or words to be released after the return address is popped from the stack. Apr 18, 2019 · Learn how to use the RET instruction to return from a procedure in different modes and privilege levels. It then performs an unconditional jump to the retrieved code location. Aug 31, 2021 · 王爽《汇编语言》第四版 超级笔记 第10章 CALL和RET指令 call和ret指令都是转移指令，它们都修改IP，或同时修改CS和IP。 它们经常被共同用来实现子程序的设计。这一章，我们讲解call和ret指令的原理。 10. ecnd grccdt obqx xtnvk zvbrm nds cfqx wtue cvuofhue sbdvtk