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pc-bios/s390-ccw: avoid floating point operations

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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>
Message-Id: <1443689387-34473-2-git-send-email-jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2015-10-01 10:49:43 +02:00
parent b2312c6800
commit af3c15fee5
1 changed files with 2 additions and 1 deletions
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3
pc-bios/s390-ccw/Makefile
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@ -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