Re: [Qemu-devel] [qemu-s390x] [PATCH] pc-bios/s390-ccw: build s390 bios with -fno-zero-initialized-in-bss

[Thomas Huth]

On 20.11.2017 10:15, Christian Borntraeger wrote:
> The QEMU ELF loader does not initialize the bss segment. This has
> triggered several bugs in the past, e.g. see commit 5d739a4787a5
> ("s390-ccw.img: Fix sporadic errors with ccw boot image - initialize
> css").
> 
> Instead of fixing these things one-by-one we can build the BIOS
> with -fno-zero-initialized-in-bss. This will move the zero variables
> also into the data segment, which is then part of a LOAD section.

It fixes the problem only for variables that are explicitely intialized
to 0 along with their declaration - it does not fix the problem for
uninitialized variables.

 Thomas