tests/tcg/s390x: Enable the multiarch system tests

Multiarch tests are written in C and need support for printing
characters. Instead of implementing the runtime from scratch, just
reuse the pc-bios/s390-ccw one.

Run tests with -nographic in order to enable SCLP (enable this for
the existing tests as well, since it does not hurt).

Use the default linker script for the new tests.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230511114651.439872-3-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/tcg/s390x/Makefile.softmmu-target

@@ -1,28 +1,40 @@
 S390X_SRC=$(SRC_PATH)/tests/tcg/s390x
 VPATH+=$(S390X_SRC)
-QEMU_OPTS=-action panic=exit-failure -kernel
+QEMU_OPTS=-action panic=exit-failure -nographic -kernel
 LINK_SCRIPT=$(S390X_SRC)/softmmu.ld
-LDFLAGS=-nostdlib -static -Wl,-T$(LINK_SCRIPT) -Wl,--build-id=none
+CFLAGS+=-ggdb -O0
+LDFLAGS=-nostdlib -static
 
 %.o: %.S
 	$(CC) -march=z13 -m64 -c $< -o $@
 
-%: %.o $(LINK_SCRIPT)
+%.o: %.c
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -march=z13 -m64 -c $< -o $@
+
+%: %.o
 	$(CC) $< -o $@ $(LDFLAGS)
 
-TESTS += unaligned-lowcore
-TESTS += bal
-TESTS += sam
-TESTS += lpsw
-TESTS += lpswe-early
-TESTS += ssm-early
-TESTS += stosm-early
-TESTS += exrl-ssm-early
+ASM_TESTS =                                                                    \
+    bal                                                                        \
+    exrl-ssm-early                                                             \
+    sam                                                                        \
+    lpsw                                                                       \
+    lpswe-early                                                                \
+    ssm-early                                                                  \
+    stosm-early                                                                \
+    unaligned-lowcore
 
 include $(S390X_SRC)/pgm-specification.mak
 $(PGM_SPECIFICATION_TESTS): pgm-specification-softmmu.o
 $(PGM_SPECIFICATION_TESTS): LDFLAGS+=pgm-specification-softmmu.o
-TESTS += $(PGM_SPECIFICATION_TESTS)
+ASM_TESTS += $(PGM_SPECIFICATION_TESTS)
+
+$(ASM_TESTS): LDFLAGS += -Wl,-T$(LINK_SCRIPT) -Wl,--build-id=none
+$(ASM_TESTS): $(LINK_SCRIPT)
+TESTS += $(ASM_TESTS)
 
-# We don't currently support the multiarch system tests
-undefine MULTIARCH_TESTS
+S390X_MULTIARCH_RUNTIME_OBJS = head64.o console.o $(MINILIB_OBJS)
+$(MULTIARCH_TESTS): $(S390X_MULTIARCH_RUNTIME_OBJS)
+$(MULTIARCH_TESTS): LDFLAGS += $(S390X_MULTIARCH_RUNTIME_OBJS)
+$(MULTIARCH_TESTS): CFLAGS += $(MINILIB_INC)
+memory: CFLAGS += -DCHECK_UNALIGNED=0

tests/tcg/s390x/console.c

@@ -0,0 +1,12 @@
+/*
+ * Console code for multiarch tests.
+ * Reuses the pc-bios/s390-ccw implementation.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include "../../../pc-bios/s390-ccw/sclp.c"
+
+void __sys_outc(char c)
+{
+    write(1, &c, sizeof(c));
+}

tests/tcg/s390x/head64.S

@@ -0,0 +1,31 @@
+/*
+ * Startup code for multiarch tests.
+ * Reuses the pc-bios/s390-ccw implementation.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#define main main_pre
+#include "../../../pc-bios/s390-ccw/start.S"
+#undef main
+
+main_pre:
+    aghi %r15,-160                     /* reserve stack for C code */
+    brasl %r14,sclp_setup
+    brasl %r14,main
+    larl %r1,success_psw               /* check main() return code */
+    ltgr %r2,%r2
+    je 0f
+    larl %r1,failure_psw
+0:
+    lpswe 0(%r1)
+
+    .align 8
+success_psw:
+    .quad 0x2000180000000,0xfff        /* see is_special_wait_psw() */
+failure_psw:
+    .quad 0x2000180000000,0            /* disabled wait */
+
+    .section .bss
+    .align 0x1000
+stack:
+    .skip 0x8000