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[qemu-s390x] [PULL 11/12] pc-bios/s390-ccw: Optimize the s390-netboot.im

From: Cornelia Huck
Subject: [qemu-s390x] [PULL 11/12] pc-bios/s390-ccw: Optimize the s390-netboot.img for size
Date: Tue, 19 Jun 2018 14:04:33 +0200

From: Thomas Huth <address@hidden>

The -O2 optimization flag is passed via CFLAGS to the firmware Makefile,
but in netbook.mak, we've got some rules that only use QEMU_CFLAGS for
compiling the libc and libnet from SLOF, so these files get compiled
without optimization so far. Use CFLAGS here, too, to create faster
and smaller code.

We can additionally save some more bytes in the firmware images by compi-
ling the code with -fno-asynchronous-unwind-tables. This will omit some
ELF sections (used for stack unwinding for example) from the image that
we do not need in the firmware.

Acked-by: Christian Borntraeger <address@hidden>
Signed-off-by: Thomas Huth <address@hidden>
 pc-bios/s390-ccw/Makefile    | 1 +
 pc-bios/s390-ccw/netboot.mak | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile
index 439e3cc9c9..1eb316b02f 100644
--- a/pc-bios/s390-ccw/Makefile
+++ b/pc-bios/s390-ccw/Makefile
@@ -15,6 +15,7 @@ OBJECTS = start.o main.o bootmap.o jump2ipl.o sclp.o menu.o \
 QEMU_CFLAGS := $(filter -W%, $(QEMU_CFLAGS))
 QEMU_CFLAGS += -ffreestanding -fno-delete-null-pointer-checks -msoft-float
 QEMU_CFLAGS += -march=z900 -fPIE -fno-strict-aliasing
+QEMU_CFLAGS += -fno-asynchronous-unwind-tables
 QEMU_CFLAGS += $(call cc-option, $(QEMU_CFLAGS), -fno-stack-protector)
 LDFLAGS += -Wl,-pie -nostdlib
diff --git a/pc-bios/s390-ccw/netboot.mak b/pc-bios/s390-ccw/netboot.mak
index 8af0cfd2da..14e96b2aa6 100644
--- a/pc-bios/s390-ccw/netboot.mak
+++ b/pc-bios/s390-ccw/netboot.mak
@@ -19,7 +19,7 @@ s390-netboot.img: s390-netboot.elf
 # libc files:
 CTYPE_OBJS = isdigit.o isxdigit.o toupper.o
 %.o : $(SLOF_DIR)/lib/libc/ctype/%.c
@@ -52,7 +52,7 @@ libc.a: $(LIBCOBJS)
 LIBNETOBJS := args.o dhcp.o dns.o icmpv6.o ipv6.o tcp.o udp.o bootp.o \
              dhcpv6.o ethernet.o ipv4.o ndp.o tftp.o pxelinux.o
 %.o : $(SLOF_DIR)/lib/libnet/%.c
        $(call quiet-command,$(CC) $(LIBNETCFLAGS) -c -o $@ 

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