Stack

Linux中，Stack是一种数据的操作方式，对内存中的数据进行操作。

    stack是倒置的，从上往下长。

    在C语言中，动态内存分配（malloc）是在heap中进行的。汇编中的动态分配本书没有涉及。

    当stack和下面的代码部分发生冲撞时，Linux会产生"segmentation fault”，并终止程序。

    stack的大小并不一定与.text .data的大小成比例。

    当程序开始运行时，stack中并非全是空的。有一些比较特殊的东西在里面放着。

Push-y命令：

PUSH pushes a 16-bit or 32-bit register or memory value that is specified by you in your source code.

PUSHF pushes the 16-bit Flags register onto the stack.

PUSHFD pushes the full 32-bit EFlags register onto the stack.

PUSHA pushes all eight of the 16-bit general-purpose registers onto the stack.

PUSHAD pushes all eight of the 32-bit general-purpose registers onto the stack.（PUSH All Double word registers）

pushf ; Push the Flags register
pusha ; Push AX, CX, DX, BX, SP, BP, SI, and DI, in that order, all at once
pushad ; Push EAX, ECX, EDX, EBX, ESP, EBP, ESI, and EDI, all at once
push ax ; Push the AX register
push eax ; Push the EAX register
push [bx] ; Push the word stored in memory at BX
push [edx] ; Push the doubleword in memory at EDX
push edi ; Push the EDI register

Pop命令：

POP, POPF, POPFD, POPA, and POPAD

popf ; Pop the top 2 bytes from the stack into Flags
popa ; Pop the top 16 bytes from the stack into AX, CX, DX, BX, BP, SI, and DI...but NOT SP!
popad ; Pop the top 32 bytes from the stack into EAX, ECX, EDX, EBX, EBP, ESI and EDI...but NOT ESP!!!
pop cx ; Pop the top 2 bytes from the stack into CX
pop esi ; Pop the top 4 bytes from the stack into ESI
pop [ebx] ; Pop the top 4 bytes from the stack into memory at EBX

对Flags寄存器操作：

PUSHF  ; Push the Flags register onto the stack..
POP BX ; ..and pop it immediately into BX

Not all bits of EFlags may be changed with POPFD. Bits VM and RF are not affected by popping a value off the stack into EFlags.

 

Stack可以用来短暂存储寄存器中的数据，使寄存器可以用在别的地方。

 

不过stack的更大的用途是调用Linux的系统服务。