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Index > MenuetOS > relative jump out of range

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Chemist



Joined: 24 Dec 2003
Posts: 10
Location: Minsk
Chemist
Hi! In TASM 5.0 this errormessage was common and if i'll use MODEL SMALL (etc.) instead of MODEL TINY everything was OK. How to fix this error with FASM 1.50 for Menuet?

P.S. My english is not well.. Wink
Post 12 Jan 2004, 19:51
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eet_1024



Joined: 22 Jul 2003
Posts: 59
eet_1024
Do you have that problem with fasm?

Fasm automatically decides which type of jump to use.
Post 12 Jan 2004, 23:15
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Chemist



Joined: 24 Dec 2003
Posts: 10
Location: Minsk
Chemist
[quote="eet_1024"]Do you have that problem with fasm?

Yes, i have this problem with fasm. I decided to use dec ecx cmp ecx,0 je ... jmp loop123 instead of loop loop123 and everything is ok now.
Post 13 Jan 2004, 00:08
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JohnFound



Joined: 16 Jun 2003
Posts: 3500
Location: Bulgaria
JohnFound
Chemist wrote:
Yes, i have this problem with fasm. I decided to use dec ecx cmp ecx,0 je ... jmp loop123 instead of loop loop123 and everything is ok now.


Well, AFAIK, loop is the only instruction where you can get this error. It is because loop have only short form of addressing. Every other jumps (conditional and unconditional) will be optimised by FASM, unless you set the exact operand size.

Regards.
Post 13 Jan 2004, 00:41
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
loop can only go +/- 127 bytes

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comrade (comrade64@live.com; http://comrade.ownz.com/)
Post 13 Jan 2004, 01:31
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Bitdog



Joined: 18 Jan 2004
Posts: 97
Bitdog
Hello. I'm a newbe 2 Fasm, but doesn't "DEC" set the Zero Flag ?
Quote: "dec ecx cmp ecx,0 je ... jmp loop123 instead of loop "
Which makes the CMP redundant ?
I don't know about Fasm, BUT Nasm allows NEAR/WORD conditional jumps?
DEC ECX
JNZ NEAR LABEL ;loop near +-0xFFFF bytes.

Fantastic Fasm appears to use size as:
DEC ECX
JNZ WORD LABEL

But then, this might be a final solution?
DEC ECX
JZ ENDloop
JMP LOOPtop
ENDloop:

I hope I haven't overstepped my boundries here?
But looked at MenuetOS yesterday for the first time,
& it was a life altering event.
I converted all my old PROCs to Fasm last night,
and todays goal is to learn more Fasm MenuetOS,
like how to get it to do something.
(Show fonts, load from HD, run a program, etc.)
(Generic newbe troubles..........Smile

Bitdog
Post 18 Jan 2004, 15:52
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