[v2,2/2] tests/tcg/s390x: Test LOAD ADDRESS EXTENDED

Commit Message

Ilya Leoshkevich Jan. 11, 2024, 9:21 a.m. UTC

Add a small test to prevent regressions. Userspace runs in primary
mode, so LAE should always set the access register to 0.

Signed-off-by: Ilya Leoshkevich <[e-mail]>
---
 tests/tcg/s390x/Makefile.target |  1 +
 tests/tcg/s390x/lae.c           | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 tests/tcg/s390x/lae.c

Patch

diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 0e670f3f8b9..30994dcf9c2 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -44,6 +44,7 @@  TESTS+=clgebr
 TESTS+=clc
 TESTS+=laalg
 TESTS+=add-logical-with-carry
+TESTS+=lae
 
 cdsg: CFLAGS+=-pthread
 cdsg: LDFLAGS+=-pthread
diff --git a/tests/tcg/s390x/lae.c b/tests/tcg/s390x/lae.c
new file mode 100644
index 00000000000..59712b5e371
--- /dev/null
+++ b/tests/tcg/s390x/lae.c
@@ -0,0 +1,31 @@ 
+/*
+ * Test the LOAD ADDRESS EXTENDED instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    unsigned long long ar = -1, b2 = 100000, r, x2 = 500;
+    /*
+     * Hardcode the register number, since clang does not allow using %rN in
+     * place of %aN.
+     */
+    register unsigned long long r2 __asm__("2");
+    int tmp;
+
+    asm("ear %[tmp],%%a2\n"
+        "lae %%r2,42(%[x2],%[b2])\n"
+        "ear %[ar],%%a2\n"
+        "sar %%a2,%[tmp]"
+        : [tmp] "=&r" (tmp), "=&r" (r2), [ar] "+r" (ar)
+        : [b2] "r" (b2), [x2] "r" (x2)
+        : "memory");
+    r = r2;
+    assert(ar == 0xffffffff00000000ULL);
+    assert(r == 100542);
+
+    return EXIT_SUCCESS;
+}