Code error - why?

Code error - why?

[Balakrishnan Ananthanarayanan]

I wrote a SAMPLE CODE - Hello.S to work for a cross-assembler mips-linux-as - but this is giving me an error message:
   ".data 
         quest: .asciiz "Hello World!"
    .text
    _start:
         la $a0, quest
         li $v0, 4
         syscall   "
       
The error messages are:
  " Hello.S line 5: illegal operands 'la' 
    Hello.S line 6: illegal operands 'li'"

Can anyone help? What is wrong?

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Re: Code error - why?

[Bradley D. LaRonde]

Drop the $ on the registers?

Regards,
Brad

----- Original Message -----
From: "Balakrishnan Ananthanarayanan" <balakris_ananth@email.com>
To: <linux-mips@oss.sgi.com>; <linux-kernel@vger.kernel.org>;
<redhat-list@redhat.com>
Sent: Monday, June 17, 2002 5:48 AM
Subject: Code error - why?


> I wrote a SAMPLE CODE - Hello.S to work for a cross-assembler
mips-linux-as - but this is giving me an error message:
>    ".data
>          quest: .asciiz "Hello World!"
>     .text
>     _start:
>          la $a0, quest
>          li $v0, 4
>          syscall   "
>
> The error messages are:
>   " Hello.S line 5: illegal operands 'la'
>     Hello.S line 6: illegal operands 'li'"
>
> Can anyone help? What is wrong?

Re: Code error - why?

[Bradley D. LaRonde]

Drop the $ on the registers?

Regards,
Brad

----- Original Message -----
From: "Balakrishnan Ananthanarayanan" <balakris_ananth@email.com>
To: <linux-mips@oss.sgi.com>; <linux-kernel@vger.kernel.org>;
<redhat-list@redhat.com>
Sent: Monday, June 17, 2002 5:48 AM
Subject: Code error - why?


> I wrote a SAMPLE CODE - Hello.S to work for a cross-assembler
mips-linux-as - but this is giving me an error message:
>    ".data
>          quest: .asciiz "Hello World!"
>     .text
>     _start:
>          la $a0, quest
>          li $v0, 4
>          syscall   "
>
> The error messages are:
>   " Hello.S line 5: illegal operands 'la'
>     Hello.S line 6: illegal operands 'li'"
>
> Can anyone help? What is wrong?

Re: Code error - why?

[Justin Carlson]

After preprocessing, the assembler needs to see $<number> as 
register specifiers, so typically your choices are to do either:

#define a0 $4  // See include/asm-mips/regdef.h for these
#define v0 $2

...

	la a0, quest
	li v0, 4



Or to just use the register numbers, e.g.

	la $4, quest
	li $2, 4


-Justin


> ----- Original Message -----
> From: "Balakrishnan Ananthanarayanan" <balakris_ananth@email.com>
> To: <linux-mips@oss.sgi.com>; <linux-kernel@vger.kernel.org>;
> <redhat-list@redhat.com>
> Sent: Monday, June 17, 2002 5:48 AM
> Subject: Code error - why?
> 
> 
> > I wrote a SAMPLE CODE - Hello.S to work for a cross-assembler
> mips-linux-as - but this is giving me an error message:
> >    ".data
> >          quest: .asciiz "Hello World!"
> >     .text
> >     _start:
> >          la $a0, quest
> >          li $v0, 4
> >          syscall   "
> >
> > The error messages are:
> >   " Hello.S line 5: illegal operands 'la'
> >     Hello.S line 6: illegal operands 'li'"
> >
> > Can anyone help? What is wrong?

Re: Code error - why?

[Maciej W. Rozycki]

On 18 Jun 2002, Justin Carlson wrote:

> After preprocessing, the assembler needs to see $<number> as 
> register specifiers, so typically your choices are to do either:
> 
> #define a0 $4  // See include/asm-mips/regdef.h for these
> #define v0 $2
> 
> ...
> 
> 	la a0, quest
> 	li v0, 4

 Well, the usual choice is to put "#include <asm/regdef.h>" instead of
copying definitions.

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

Re: Code error - why?

[Justin Wojdacki]

Balakrishnan Ananthanarayanan wrote:
> 
> I wrote a SAMPLE CODE - Hello.S to work for a cross-assembler mips-linux-as - but this is giving me an error message:
>    ".data
>          quest: .asciiz "Hello World!"
>     .text
>     _start:
>          la $a0, quest
>          li $v0, 4
>          syscall   "
> 
> The error messages are:
>   " Hello.S line 5: illegal operands 'la'
>     Hello.S line 6: illegal operands 'li'"
> 
> Can anyone help? What is wrong?
> 

$a0 and $v0 are what's probably giving you grief. Are you relying on
the assembler to know these symbols or are you including a file that
defines them. 

Just to be sure, try replacing $a0 with $4 and $v0 with $2 and see if
the code builds.

-- 
-------------------------------------------------
Justin Wojdacki        
justin.wojdacki@analog.com         (408) 350-5032
Communications Processors Group -- Analog Devices

Re: Code error - why?

[Thiemo Seufer]

Balakrishnan Ananthanarayanan wrote:
[snip]
>          la $a0, quest
>          li $v0, 4
>          syscall   "
>        
> The error messages are:
>   " Hello.S line 5: illegal operands 'la' 
>     Hello.S line 6: illegal operands 'li'"
> 
> Can anyone help? What is wrong?

The register names are wrong. The software names, if defined in some
assembler header, are 'a0' and 'v0', while the assembler recognized
hardware names are '$4' and '$2'.


Thiemo