Error: Invalid address

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l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 27 Jul 2016, 17:31

Code:

stos word[ds:di]

1.71.39

27 Jul 2016, 17:31

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8466
Location: Kraków, Poland

Tomasz Grysztar 27 Jul 2016, 18:03

Intel® 64 and IA-32 Architectures
Software Developer’s Manual wrote:

STOS/STOSB/STOSW/STOSD/STOSQ—Store String
(...)
The destination operand is a memory location, the address of which is read from either the ES:EDI or ES:DI register (depending on the address-size attribute of the instruction and the mode of operation). The ES segment cannot be overridden with a segment override prefix.

27 Jul 2016, 18:03

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20759
Location: In your JS exploiting you and your system

revolution 27 Jul 2016, 20:42

l4m2: That code won't work on any x86 processor. It is a limitation of the CPU. Be thankful that fasm saved you from some hours of debugging.

27 Jul 2016, 20:42

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 28 Jul 2016, 01:09

Uh-uh. I found a lot of document only say that STOSX stores acc into [(E/R)DI]. Maybe we now use more in flat mode and no need to care about segments Smile

Thanks for your reply

28 Jul 2016, 01:09

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