tests/tcg: extract __semi_call into a header and expand

There are two types of ARM semicall - lets test them both. Putting the
logic in a header will make re-using the functions easier later.

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

tests/tcg/arm/Makefile.target

@@ -31,9 +31,18 @@ run-fcvt: fcvt
 
 # Semihosting smoke test for linux-user
 ARM_TESTS += semihosting
+semihosting: CFLAGS += -mthumb
 run-semihosting: semihosting
 	$(call run-test,$<,$(QEMU) $< 2> $<.err, "$< on $(TARGET_NAME)")
 
+ARM_TESTS += semihosting-arm
+semihosting-arm: CFLAGS += -marm
+semihosting-arm: semihosting.c
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS)
+
+run-semihosting-arm: semihosting-arm
+	$(call run-test,$<,$(QEMU) $< 2> $<.err, "$< on $(TARGET_NAME)")
+
 run-plugin-semihosting-with-%:
 	$(call run-test, $@, $(QEMU) $(QEMU_OPTS) \
 		-plugin $(PLUGIN_DIR)/$(call extract-plugin,$@) \

tests/tcg/arm/semicall.h

@@ -0,0 +1,35 @@
+/*
+ * Semihosting Tests
+ *
+ * Copyright (c) 2019
+ * Written by Alex Bennée <alex.bennee@linaro.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define SYS_WRITE0      0x04
+#define SYS_READC       0x07
+#define SYS_REPORTEXC   0x18
+
+uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
+{
+#if defined(__arm__)
+    register uintptr_t t asm("r0") = type;
+    register uintptr_t a0 asm("r1") = arg0;
+#ifdef __thumb__
+#  define SVC  "svc 0xab"
+#else
+#  define SVC  "svc 0x123456"
+#endif
+    asm(SVC : "=r" (t)
+        : "r" (t), "r" (a0));
+#else
+    register uintptr_t t asm("x0") = type;
+    register uintptr_t a0 asm("x1") = arg0;
+    asm("hlt 0xf000"
+        : "=r" (t)
+        : "r" (t), "r" (a0));
+#endif
+
+    return t;
+}

tests/tcg/arm/semihosting.c

@@ -8,26 +8,7 @@
  */
 
 #include <stdint.h>
-
+#include "semicall.h"
-#define SYS_WRITE0      0x04
-#define SYS_REPORTEXC   0x18
-
-void __semi_call(uintptr_t type, uintptr_t arg0)
-{
-#if defined(__arm__)
-    register uintptr_t t asm("r0") = type;
-    register uintptr_t a0 asm("r1") = arg0;
-    asm("svc 0xab"
-        : /* no return */
-        : "r" (t), "r" (a0));
-#else
-    register uintptr_t t asm("x0") = type;
-    register uintptr_t a0 asm("x1") = arg0;
-    asm("hlt 0xf000"
-        : /* no return */
-        : "r" (t), "r" (a0));
-#endif
-}
 
 int main(int argc, char *argv[argc])
 {