[PATCH-for-10.1 8/9] linux-user/arm: Implement MTE stubs for 32-bit user emulation

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

We want to build MTE code once, but on linux-user it calls
arm_set_mte_tcf0() which is only defined for Aarch64.
Expose the declaration on 32-bit ARM by renaming
aarch64/mte_user_helper.h -> arm/mte_user_helper.h, then
add a stub in arm/mte_user_helper.c.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 linux-user/aarch64/mte_user_helper.h | 27 +---------------------
 linux-user/arm/mte_user_helper.h     | 34 ++++++++++++++++++++++++++++
 linux-user/arm/mte_user_helper.c     | 13 +++++++++++
 linux-user/arm/meson.build           |  2 ++
 4 files changed, 50 insertions(+), 26 deletions(-)
 create mode 100644 linux-user/arm/mte_user_helper.h
 create mode 100644 linux-user/arm/mte_user_helper.c

diff --git a/linux-user/aarch64/mte_user_helper.h b/linux-user/aarch64/mte_user_helper.h
index 0c53abda222..63f63abff62 100644
--- a/linux-user/aarch64/mte_user_helper.h
+++ b/linux-user/aarch64/mte_user_helper.h
@@ -6,29 +6,4 @@
  * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
-#ifndef AARCH64_MTE_USER_HELPER_H
-#define AARCH64_MTE USER_HELPER_H
-
-#include "user/abitypes.h"
-
-#ifndef PR_MTE_TCF_SHIFT
-# define PR_MTE_TCF_SHIFT       1
-# define PR_MTE_TCF_NONE        (0UL << PR_MTE_TCF_SHIFT)
-# define PR_MTE_TCF_SYNC        (1UL << PR_MTE_TCF_SHIFT)
-# define PR_MTE_TCF_ASYNC       (2UL << PR_MTE_TCF_SHIFT)
-# define PR_MTE_TCF_MASK        (3UL << PR_MTE_TCF_SHIFT)
-# define PR_MTE_TAG_SHIFT       3
-# define PR_MTE_TAG_MASK        (0xffffUL << PR_MTE_TAG_SHIFT)
-#endif
-
-/**
- * arm_set_mte_tcf0 - Set TCF0 field in SCTLR_EL1 register
- * @env: The CPU environment
- * @value: The value to be set for the Tag Check Fault in EL0 field.
- *
- * Only SYNC and ASYNC modes can be selected. If ASYMM mode is given, the SYNC
- * mode is selected instead. So, there is no way to set the ASYMM mode.
- */
-void arm_set_mte_tcf0(CPUArchState *env, abi_long value);
-
-#endif /* AARCH64_MTE_USER_HELPER_H */
+#include "../arm/mte_user_helper.h"
diff --git a/linux-user/arm/mte_user_helper.h b/linux-user/arm/mte_user_helper.h
new file mode 100644
index 00000000000..0c53abda222
--- /dev/null
+++ b/linux-user/arm/mte_user_helper.h
@@ -0,0 +1,34 @@
+/*
+ * ARM MemTag convenience functions.
+ *
+ * This code is licensed under the GNU GPL v2 or later.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef AARCH64_MTE_USER_HELPER_H
+#define AARCH64_MTE USER_HELPER_H
+
+#include "user/abitypes.h"
+
+#ifndef PR_MTE_TCF_SHIFT
+# define PR_MTE_TCF_SHIFT       1
+# define PR_MTE_TCF_NONE        (0UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_SYNC        (1UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_ASYNC       (2UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TCF_MASK        (3UL << PR_MTE_TCF_SHIFT)
+# define PR_MTE_TAG_SHIFT       3
+# define PR_MTE_TAG_MASK        (0xffffUL << PR_MTE_TAG_SHIFT)
+#endif
+
+/**
+ * arm_set_mte_tcf0 - Set TCF0 field in SCTLR_EL1 register
+ * @env: The CPU environment
+ * @value: The value to be set for the Tag Check Fault in EL0 field.
+ *
+ * Only SYNC and ASYNC modes can be selected. If ASYMM mode is given, the SYNC
+ * mode is selected instead. So, there is no way to set the ASYMM mode.
+ */
+void arm_set_mte_tcf0(CPUArchState *env, abi_long value);
+
+#endif /* AARCH64_MTE_USER_HELPER_H */
diff --git a/linux-user/arm/mte_user_helper.c b/linux-user/arm/mte_user_helper.c
new file mode 100644
index 00000000000..6fd19dc1073
--- /dev/null
+++ b/linux-user/arm/mte_user_helper.c
@@ -0,0 +1,13 @@
+/*
+ * ARM ARM MemTag user emulation stubs.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "mte_user_helper.h"
+
+void arm_set_mte_tcf0(CPUArchState *env, abi_long value)
+{
+    g_assert_not_reached();
+}
diff --git a/linux-user/arm/meson.build b/linux-user/arm/meson.build
index 348ffb810d7..95e8c078e29 100644
--- a/linux-user/arm/meson.build
+++ b/linux-user/arm/meson.build
@@ -24,3 +24,5 @@ vdso_le_inc = gen_vdso.process('vdso-le.so',
 linux_user_ss.add(when: 'TARGET_ARM', if_true: [
     vdso_be8_inc, vdso_be32_inc, vdso_le_inc
 ])
+
+linux_user_ss.add(when: 'TARGET_ARM', if_true: [files('mte_user_helper.c')])
-- 
2.47.1