Re: interface prob in gas and ld

[Ian Lance Taylor <ian at wasabisystems dot com>]

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

>     I have small query consider the following exambple
> 
> ABC:				;Line 1
>         .short 0x88	;	2
> Lp.1:				;	3
>         .short  ABC+9	;	4
> 
> First of all what exactly does it mean, and how is it handled in general
> GAS/Linker?

For this gas should generate a reloc producing a 16 bit relocation
with a symbol of either the section symbol or ABC, and an offset of 9,
plus the section offset if any.

> Secondly:
> Now when my bfd assembler parses Line 4 it passes it to fix_new_exp().

What it passes to fix_new_exp() should just be an O_symbol, though, I
think.

> 	Poblem 1: fix_new_exp() does not handle negative value in fr_offset
> attribute

How does fr_offset figure into this?  That is the offset into the
frag, which as far as I can see is irrelevant here.

> 	How can i pass this "value (exp->X_add_number)"(9 in this case) to
> linker along with the reloc entry.Though
> 	i have defined external_reloc in include/coff/XXX.h containing this
> value attribute.

Normally the 9 would be handled as a reloc addend.  For some targets
an addend is stored in the reloc entry itself.  For some it is stored
in the object file.

Ian