[Qemu-devel] [PATCH 1/5] pc-bios/s390-ccw: avoid floating point operations

[Jens Freimann <jfrei@linux.vnet.ibm.com>]

From: Christian Borntraeger <borntraeger@de.ibm.com>

Some gcc versions (e.g. Fedora 22 gcc 5.1.1) seem to use floating
point registers for spilling and filling of general purpose registers.
As the BIOS does not activate the AFP register setting of CR0 this can
cause data exception program checks.
Disallow floating point in the BIOS as a simple solution.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
---
 pc-bios/s390-ccw/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
index 746603a..15e4232 100644
--- a/pc-bios/s390-ccw/Makefile
+++ b/pc-bios/s390-ccw/Makefile
@@ -10,7 +10,8 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/s390-ccw)
 .PHONY : all clean build-all
 
 OBJECTS = start.o main.o bootmap.o sclp-ascii.o virtio.o
-CFLAGS += -fPIE -fno-stack-protector -ffreestanding -fno-delete-null-pointer-checks
+CFLAGS += -fPIE -fno-stack-protector -ffreestanding
+CFLAGS += -fno-delete-null-pointer-checks -msoft-float
 LDFLAGS += -Wl,-pie -nostdlib
 
 build-all: s390-ccw.img
-- 
2.3.9