@@ -1,6 +1,6 @@
# Common mips*-softmmu CONFIG defines
-# CONFIG_SEMIHOSTING is always required on this architecture
+# CONFIG_SEMIHOSTING is probably not required on KVM only builds
CONFIG_SEMIHOSTING=y
CONFIG_ISA_BUS=y
@@ -1,5 +1,6 @@
obj-y += translate.o dsp_helper.o op_helper.o lmi_helper.o helper.o cpu.o
obj-y += gdbstub.o msa_helper.o
-obj-$(CONFIG_SOFTMMU) += mips-semi.o
+obj-$(CONFIG_SEMIHOSTING) += mips-semi.o
+obj-$(call lnot,$(CONFIG_SEMIHOSTING)) += mips-semi-stubs.o
obj-$(CONFIG_SOFTMMU) += machine.o cp0_timer.o
obj-$(CONFIG_KVM) += kvm.o
new file mode 100644
@@ -0,0 +1,22 @@
+/*
+ * Unified Hosting Interface syscalls stubs
+ *
+ * Copyright (c) 2019 Red Hat, Inc.
+ *
+ * Author:
+ * Philippe Mathieu-Daudé <philmd@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/helper-proto.h"
+
+void helper_do_semihosting(CPUMIPSState *env)
+{
+ g_assert_not_reached();
+}
If a distribution wants to build QEMU without semihosting support, it currently gets this build failure: $ ./configure --target-list=mips64el-softmmu --without-default-devices $ sed -i s/CONFIG_SEMIHOSTING=y/CONFIG_SEMIHOSTING=n/ default-configs/mips-softmmu-common.mak $ make subdir-mips64el-softmmu [...] LINK mips64el-softmmu/qemu-system-mips64el /usr/bin/ld: target/mips/mips-semi.o: in function `helper_do_semihosting': ./target/mips/mips-semi.c:335: undefined reference to `qemu_semihosting_log_out' /usr/bin/ld: ./target/mips/mips-semi.c:338: undefined reference to `qemu_semihosting_log_out' collect2: error: ld returned 1 exit status make[1]: *** [Makefile:204: qemu-system-mips64el] Error 1 make: *** [Makefile:472: subdir-mips64el-softmmu] Error 2 Fix it by providing a stub when semihosting is disabled. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> --- default-configs/mips-softmmu-common.mak | 2 +- target/mips/Makefile.objs | 3 ++- target/mips/mips-semi-stubs.c | 22 ++++++++++++++++++++++ 3 files changed, 25 insertions(+), 2 deletions(-) create mode 100644 target/mips/mips-semi-stubs.c