Esp: creating stacks bevor use

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Syrasia

Joined: 25 Feb 2010
Posts: 11
Location: Saarland, Germany

Syrasia

Hi there,
i used the search, but no luck on this. Sorry Sad

So here my idea: creating stacks in allocated mem for later us in systems calls.
So if I then call som system function I would let esp point on my custom stack.
Is this possible? How far does ebp affect the stack?
And how big is my initial stack?
Also what of this is possible in long mode? Using rsp and rbp?
I am looking forward for your help.

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22 May 2011, 11:54

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji

Of course it is possible.
I did it in kernel mode, it works fine.

Code:

     my_stack dd 4000h dup ? 
    ;4000h=4*1000h (Quad Core)
  ;or with "ExAllocatePoolWithTag"

      IA32_SYSENTER_ESP equ 175h
;-----------------------------------------------
      cli
 mov     ecx,IA32_SYSENTER_ESP
       rdmsr                                   ;(yy)

   mov     [CPU.R0_Stack + edi],eax        ;save old stack

 lea     eax,[esi + 1]                   ;4µPs (esi = 0,1,2,3)
      imul    eax,eax,1000h
       lea     eax,[my_stack + eax]

    wrmsr                                   ;edx from (yy)
      sti

     ;"KeSetSystemAffinityThread,next_core" ... and loop

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22 May 2011, 13:19

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