堆模拟栈实现协程切换后栈内存异常修改问题求助

问题背景 #

通过C++程序，用堆内存模拟栈空间，配合汇编指令操作寄存器完成协程切换，但切换到新栈后调用函数时，出现栈内存被意外修改的情况，已影响程序正常运行。目前不确定修改操作来自GCC还是操作系统，已知写入内容包含程序运行目录。

函数调用前GDB调试信息 #

(gdb) info frame
Stack level 0, frame at 0x420520:
 rip = 0x7ffff7eaf3b6 in clsn::Coroutine::CoroutineFunc (/data/workspace/DeftRPC/src/coroutine/Coroutine.cpp:16); saved rip = 0x0
 called by frame at 0x420528
 source language c++.
 Arglist at 0x420510, args: arg=0x41ffd0
 Locals at 0x420510, Previous frame's sp is 0x420520
 Saved registers:
  rbp at 0x420510, rip at 0x420518

此时RIP（0x420518）附近内存状态：

函数调用后GDB调试信息 #

(gdb) info frame
Stack level 0, frame at 0x4204f0:
 rip = 0x7ffff7eaf436 in clsn::Coroutine::operator() (/data/workspace/DeftRPC/src/coroutine/Coroutine.cpp:32); saved rip = 0x7ffff7eaf3c2
 called by frame at 0x420520
 source language c++.
 Arglist at 0x4204e0, args: this=0x41ffd0
 Locals at 0x4204e0, Previous frame's sp is 0x4204f0
 Saved registers:
  rbp at 0x4204e0, rip at 0x4204e8

RIP向低地址移动属于正常栈操作行为，当前RIP（0x4204e8）附近内存状态：

截至以上步骤，程序行为均符合预期。

异常内存修改情况 #

当前RIP低地址区域的栈内存出现非预期修改，内存变化状态如下：

内容的提问来源于stack exchange，提问作者qingfu liu