Am 15.06.2015 um 12:24 schrieb Aurelien Jarno: > Starting with version 4.9, GCC assumes it can't safely dereference null > pointers, and uses this for some optimizations. On s390, the lowcore > memory is located at address 0, so this assumption is wrong and breaks > the s390-ccw firmware. Pass -fdelete-null-pointer-checks to avoid that. > > Cc: Cornelia Huck <cornelia.h...@de.ibm.com> > Cc: Christian Borntraeger <borntrae...@de.ibm.com> > Cc: Alexander Graf <ag...@suse.de> > Signed-off-by: Aurelien Jarno <aurel...@aurel32.net> > --- > pc-bios/s390-ccw/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile > index 009bb8d..746603a 100644 > --- a/pc-bios/s390-ccw/Makefile > +++ b/pc-bios/s390-ccw/Makefile > @@ -10,7 +10,7 @@ $(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 > +CFLAGS += -fPIE -fno-stack-protector -ffreestanding > -fno-delete-null-pointer-checks > LDFLAGS += -Wl,-pie -nostdlib > > build-all: s390-ccw.img >
applied thanks.
