[Qemu-devel] [RFC PATCH 3/3] target/arm: Make m_helper.c optional via CONFIG_ARM_V7M

[Thomas Huth]

We've already got the CONFIG_ARM_V7M switch, but it currently can
not be disabled yet. The m_helper.c code should not be compiled
into the binary if the switch is not enabled. We also have to
provide some stubs in a separate file to make sure that we still
can link the other code without CONFIG_ARM_V7M.

Signed-off-by: Thomas Huth <address@hidden>
---
 target/arm/Makefile.objs   |  3 +-
 target/arm/m_helper-stub.c | 58 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 target/arm/m_helper-stub.c

diff --git a/target/arm/Makefile.objs b/target/arm/Makefile.objs
index 5cafc1eb6c..225e7a70a9 100644
--- a/target/arm/Makefile.objs
+++ b/target/arm/Makefile.objs
@@ -36,7 +36,8 @@ obj-y += tlb_helper.o debug_helper.o
 obj-y += translate.o op_helper.o
 obj-y += crypto_helper.o
 obj-y += iwmmxt_helper.o vec_helper.o neon_helper.o
-obj-y += m_helper.o
+obj-$(CONFIG_ARM_V7M) += m_helper.o
+obj-$(call lnot,$(CONFIG_ARM_V7M)) += m_helper-stub.o
 
 obj-$(CONFIG_SOFTMMU) += psci.o
 
diff --git a/target/arm/m_helper-stub.c b/target/arm/m_helper-stub.c
new file mode 100644
index 0000000000..8ec9de0fb6
--- /dev/null
+++ b/target/arm/m_helper-stub.c
@@ -0,0 +1,58 @@
+/*
+ * ARM V7M related stubs.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/helper-proto.h"
+
+void HELPER(v7m_bxns)(CPUARMState *env, uint32_t dest)
+{
+    abort();
+}
+
+void HELPER(v7m_blxns)(CPUARMState *env, uint32_t dest)
+{
+    abort();
+}
+
+uint32_t HELPER(v7m_mrs)(CPUARMState *env, uint32_t reg)
+{
+    abort();
+}
+
+void HELPER(v7m_msr)(CPUARMState *env, uint32_t maskreg, uint32_t val)
+{
+    abort();
+}
+
+uint32_t HELPER(v7m_tt)(CPUARMState *env, uint32_t addr, uint32_t op)
+{
+    abort();
+}
+
+void HELPER(v7m_preserve_fp_state)(CPUARMState *env)
+{
+    abort();
+}
+
+void write_v7m_exception(CPUARMState *env, uint32_t new_exc)
+{
+    abort();
+}
+
+void HELPER(v7m_vlldm)(CPUARMState *env, uint32_t fptr)
+{
+    abort();
+}
+
+void HELPER(v7m_vlstm)(CPUARMState *env, uint32_t fptr)
+{
+    abort();
+}
+
+ARMMMUIdx arm_v7m_mmu_idx_for_secstate(CPUARMState *env, bool secstate)
+{
+    abort();
+}
-- 
2.18.1