Commit af3c15fe authored Oct 01, 2015 by Christian Borntraeger

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



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>

parent b2312c68

pc-bios/s390-ccw/Makefile

+2 −1

Original line number	Diff line number	Diff line
		@@ -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