X86 Assembly Short Jump
Tue Dec 30 13:56:00 GMT 2003
I double checked the Intel documentation
(http://www.intel.com/design/pentiumiii/manuals/), and as far as I can
tell JMP is the only non-conditional jump instruction of this type.
Thanks for the suggestion though. I just wanted to know if there was
something horribly obvious that I was doing wrong. If anyone has
anymore suggestions... they'd be appreciated.
From: firstname.lastname@example.org [mailto:email@example.com]
Sent: Tuesday, December 30, 2003 1:51 AM
Cc: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
Subject: Re: X86 Assembly Short Jump
It seems that you should use another jump instruction.
I have the impression that there are several typy jump instructions in
For JMP, the destination address is a relative address. There should be
instruction, which has a absolute address as destination.
Anyway, I am not sure. You can refer the Intel doc.
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Assembly Short Jump
I've having a problem using gcc's inline assembly on a Pentium 3 running
I'm working inside a __asm__("."); block and I'd like to execute a short
(near relative) jump instruction. It doesn't seem to work. Instead, I
get a near jump to an absolute position, so I figure that I'm doing
something wrong. If anyone could help, I'd appreciate it..
When the instruction is executed, eip is set to 0x02, instead of being
set to eip+2. I looked at the disassembly in gdb and the op-code I
should be getting according to the Intel IA32 Instruction Set Reference
is "EB" but instead I'm instead getting "E9".
Again, any help would be appreciated. Perhaps there's a better way to
jump to a relative position within an assembly block.
JMP 0x02 # Should add 0x02 to eip, but instead, it
eip to 0x02.
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