assemble error

BippyM · 28 February 2007, 17:44

can someone tewll me why

Code:

lea    $10f80(a0),a0

fails to assemble with the error

Code:

The argument value is larger than the operand width

a0 holds location of expmemory and 10f80 is the offset from the start of the loader!

StingRay · 28 February 2007, 17:48

That's because the offset is too big, lea xxx(ax),ax only works for values <32k, it's 16bit signed. So do add.l #$10f80,a0 to fix that error.

Edit: I don't know which assembler you are using but Asm1/Pro gives "Out of Range 16 Bit" error which is much more useful than the one your assembler gives I think.

BippyM · 28 February 2007, 17:52

thanks stingray

I have another problem that is relevant to my slave.. will post over there

StingRay · 28 February 2007, 17:59

Feel free to do so.

Btw, if your assembler supports 020+ instructions, you can have offsets larger than 32k for the lea xxx(ax),ax instruction.

BippyM · 28 February 2007, 18:00

i'm using barfly

StingRay · 28 February 2007, 18:09

Then enable 020+ instructions and you can have lea ($10f80,a0),a0

Edit: just did a test, seems barfly automatically recognizes 020+ instructions if you use the new syntax. So just use the syntax I've been using above and you can assemble it.

Edit2: WRONG!

Barfly doesn't complain but the disassembly shows that it just generated code which uses a negative offset. PHXass gives correct code but you have to enable 020+ mode. I'd say just use the add.l solution and all is fine. =)

Codetapper · 28 February 2007, 21:05

Don't use specific 020 code as then your slave will ONLY work on 68020+! And there are still some people that use WHDLoad on A2000's etc.

28 February 2007, 17:44	#1
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	assemble error can someone tewll me why Code: lea $10f80(a0),a0 fails to assemble with the error Code: The argument value is larger than the operand width a0 holds location of expmemory and 10f80 is the offset from the start of the loader!

28 February 2007, 18:09	#6
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Then enable 020+ instructions and you can have lea ($10f80,a0),a0 Edit: just did a test, seems barfly automatically recognizes 020+ instructions if you use the new syntax. So just use the syntax I've been using above and you can assemble it. Edit2: WRONG! Barfly doesn't complain but the disassembly shows that it just generated code which uses a negative offset. PHXass gives correct code but you have to enable 020+ mode. I'd say just use the add.l solution and all is fine. =) Last edited by StingRay; 28 February 2007 at 18:17.

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28 February 2007, 17:48	#2
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	That's because the offset is too big, lea xxx(ax),ax only works for values <32k, it's 16bit signed. So do add.l #$10f80,a0 to fix that error. Edit: I don't know which assembler you are using but Asm1/Pro gives "Out of Range 16 Bit" error which is much more useful than the one your assembler gives I think.

28 February 2007, 17:52	#3
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	thanks stingray I have another problem that is relevant to my slave.. will post over there

28 February 2007, 17:59	#4
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Feel free to do so. Btw, if your assembler supports 020+ instructions, you can have offsets larger than 32k for the lea xxx(ax),ax instruction.

28 February 2007, 18:00	#5
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	i'm using barfly

28 February 2007, 21:05	#7
Codetapper 2 contact me: email only! Join Date: May 2001 Location: Auckland / New Zealand Posts: 3,182	Don't use specific 020 code as then your slave will ONLY work on 68020+! And there are still some people that use WHDLoad on A2000's etc.

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