假设你有一个堆栈框架......
push %ebp
movl %esp, %ebp
subl $20, %esp
High (+)
+-------------+
| |
| old %ebp |
| |
| |
+-------------+ %ebp
| |
| |
| |
| |
| |
| |
| |
| |
+-------------+ $esp
Low (-)
假设你接受一个双字（4个字节），并将它移动到（％esp）......
movl $0x44415441, (%esp) #0x44415441 being "DATA" in hex for ASCII...
堆栈看起来像这样吗？
High (+)
+-------------+
| |
| old %ebp |
| |
| |
+-------------+ %ebp
| |
| |
| |
| |
+-------------+
| D |
| A |
| T |
| A |
+-------------+ %esp
Low (-)
还是这个？
High (+)
+-------------+
| |
| old %ebp |
| |
| |
+-------------+ %ebp
| |
| |
| |
| |
| |
| |
| |
| |
| |
+-------------+ %esp
| D |
| A |
| T |
| A |
+-------------+
Low (-)
此外，这四个字节是否会在内存中这样排列......
High (+)
+-------------+
| D |
| A |
| T |
| A |
+-------------+
Low (-)
或者像这样...
High (+)
+-------------+
| A |
| T |
| A |
| D |
+-------------+
Low (-)