target/arm: use the common interface for WRITE0/WRITEC in arm-semi

Now we have a common semihosting console interface use that for our
string output. However ARM is currently unique in also supporting
semihosting for linux-user so we need to replicate the API in
linux-user. If other architectures gain this support we can move the
file later.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/linux-user/arm/semihost.c b/linux-user/arm/semihost.c
new file mode 100644
index 0000000000..9554102a85
--- /dev/null
+++ b/linux-user/arm/semihost.c
@@ -0,0 +1,24 @@
+/*
+ * ARM Semihosting Console Support
+ *
+ * Copyright (c) 2019 Linaro Ltd
+ *
+ * Currently ARM is unique in having support for semihosting support
+ * in linux-user. So for now we implement the common console API but
+ * just for arm linux-user.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "hw/semihosting/console.h"
+#include "qemu.h"
+
+int qemu_semihosting_console_out(CPUArchState *env, target_ulong addr, int len)
+{
+    void *s = lock_user_string(addr);
+    len = write(STDERR_FILENO, s, len ? len : strlen(s));
+    unlock_user(s, addr, 0);
+    return len;
+}