[coreboot] issues with seabios on the m2a-vm

Kevin O'Connor kevin at koconnor.net
Fri Feb 27 01:38:56 CET 2009


On Thu, Feb 26, 2009 at 01:53:04PM -0500, Ward Vandewege wrote:
> On Mon, Feb 23, 2009 at 09:06:01PM -0500, Kevin O'Connor wrote:
> > Okay - I'm at a loss to explain what's going on.  I wonder if there is
> > a compiler bug.  Can you place the out/rom16.o and out/rom32.o files
> > somewhere where I can grab them?  Also, the patch below will help with
> > debugging.
> 
> Sure:
> 
>   http://ward.vandewege.net/coreboot/m2a-vm/rom16.o
>   http://ward.vandewege.net/coreboot/m2a-vm/rom32.o

Wow, this looks like a compiler bug.  When disassembling I see:

src/util.c:226
   f1597:       58                      popl   %eax
   f1598:       85 ed                   testl  %ebp,%ebp
   f159a:       7e 1c                   jle    f15b8 <get_keystroke+0xe4>

But, %ebp doesn't seem to be set before this point.  Further, the
'msec' parameter should be %eax at the start of the fuction, but %eax
is clobbered near the top of the function.

What version of gcc are you using?

I'm currently using FC10:

$ gcc --version
gcc (GCC) 4.3.2 20081105 (Red Hat 4.3.2-7)
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-Kevin




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