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Re: symbol resolution in linker?


"Vineet Sharma, Noida" <vineets@noida.hcltech.com> writes:

> If my assembler sees any undefined symbol (say "xyz"), it makes an entry of
> symbol "xyz"(section "*UND*") and a reloc entry.
> Now when my linker tries to resolve the address. it does not resolve
> it(inspite of the fact that this symbol "xyz" is defined in another object
> file linked with it.

When you say that the symbol is defined in another object file, what
are you basing that on?  Do you see the symbol when you run `nm -g' on
the object file which should define it?

> Secondly "Is it normal to have linker output as :
> 
> 
> 00000000 <.text>:
>    0:	8a 8a       	/* Some instruction*/ 
>    2:	0c 03       	/* Some instruction*/				/*
> Note there are 2 .text section, 2 abc label*/
>    4:	0b 03       	/* Some instruction*/				/*Is
> it normal?*/
>    6:	0c 05       	/* Some instruction */		
> 
> 00000008 <xyz>:
>    8:	0c 01       	/* Some instruction*/
> 
> 0000000a <abc>:
>    a:	8c 0d       	/* Some instruction*/
> 
> 0000000c <.text>:
>    c:	8a 1a       	/* Some instruction*/
> 
> 0000000e <abc>:
>    e:	0b ff       	/* Some instruction*/
>   10:	0c 00       	/* Some instruction refreing xyz*/	/*This
> instruction never finds the xyz symbol*/

That would be normal if xyz were a local symbol.  Note that all
symbols are local by default.  You need to use the .globl pseudo-op to
mark a symbol as globally visible.

> And i dont want two .text section i want them to be combined and reslove the
> symbols uniqily.

I'm afraid that I don't understand that.  You presumably only have one
.text section in the output file, as reported by objdump h.  Otherwise
I don't understand what you mean.

Ian


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