Re: Problem with gas 2.9.5 in etherboot 4.6.8

[Klaus Espenlaub <espenlaub@informatik.uni-ulm.de>]

Christoph Plattner wrote:
> 
> While compiling etherboot32 in version 4.6.8 I got following error
> on Linux RedHat 6.2 (egcs-2.91.66, as 2.9.5)
> 
> gcc -E -DMOTD -DIMAGE_MENU -DBACKOFF_LIMIT=7 -DASK_BOOT=3
> -DANS_DEFAULT=ANS_NETWORK -O2 -g -fstrength-reduce -fomit-frame-pointer
> -m386 -malign-jumps=1 -malign-loops=1 -malign-functions=1 -Wall -W
> -Wno-format -Wno-unused -DVERSION=\"4.6.8\" -DRELOC=0x98000  start32.S |
> as  -o bin32/start32.o
> {standard input}: Assembler messages:
> {standard input}:323: Error: suffix or operands invalid for `ljmp'
> make: *** [bin32/start32.o] Error 1
> 
> The problem seem to be the `*' in the LJMPI() macro.
> The problem is in the xstart routine. As I saw in the other
> parts of the code and the the code 4.6.2, I think, the `*' has
> to be removed. In 4.6.2 there was no distinguish between GAS291 and
> GAS295 on this line in xstart:
> 
>         ADDR32 ljmp     _execaddr-_start
> 
> In 4.6.8 this line:
> 
>         ADDR32  LJMPI(_execaddr-_start)
> 
> with the difference:
> 
> #ifdef  GAS291
> #define DATA32 data32;
> #define ADDR32 addr32;
> #define LJMPI(x)        ljmp    x
> #else
> #define DATA32 data32
> #define ADDR32 addr32
> #define LJMPI(x)        ljmp    *x
> #endif
> 
> Whatfor the `*' here ?

The newer gas 2.9.5 obviously issue a warning if there is no `*', but
unfortunately the older ones don't accept it.  The problem witg binutils 2.9.5
is that it is work in progress and not a released, stable version.  I also ran
into this problem.  For now I think it should be removed.  The warning message
can be ignored, but not the error message :)

> PS: Without `*' the code builds, but I have not tested it !

It works.


Klaus
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