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Re: [Qemu-devel] [PATCH] pc-bios/s390-ccw: build s390 bios with -fno-zer

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH] pc-bios/s390-ccw: build s390 bios with -fno-zero-initialized-in-bss
Date: Mon, 20 Nov 2017 10:19:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 11/20/2017 10:15 AM, 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

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.

Doesn't this bloat the firmware? Why don't we just manually clear bss in the firmware itself? It's what all other firmwares do :)


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