tests/tcg/s390x: Test VREP

Add a small test to prevent regressions.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230807163459.849766-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/tcg/s390x/Makefile.target

@@ -60,6 +60,7 @@ Z13_TESTS+=lcbb
 Z13_TESTS+=locfhr
 Z13_TESTS+=vcksm
 Z13_TESTS+=vstl
+Z13_TESTS+=vrep
 $(Z13_TESTS): CFLAGS+=-march=z13 -O2
 TESTS+=$(Z13_TESTS)
 

tests/tcg/s390x/vrep.c

@@ -0,0 +1,81 @@
+/*
+ * Test the VREP instruction.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <assert.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "vx.h"
+
+static void handle_sigill(int sig, siginfo_t *info, void *ucontext)
+{
+    mcontext_t *mcontext = &((ucontext_t *)ucontext)->uc_mcontext;
+    char *insn = (char *)info->si_addr;
+
+    if (insn[0] != 0xe7 || insn[5] != 0x4d) {
+        _exit(EXIT_FAILURE);
+    }
+
+    mcontext->gregs[2] = SIGILL;
+}
+
+static inline __attribute__((__always_inline__)) unsigned long
+vrep(S390Vector *v1, const S390Vector *v3, const uint16_t i2, const uint8_t m4)
+{
+    register unsigned long sig asm("r2") = -1;
+
+    asm("vrep %[v1],%[v3],%[i2],%[m4]\n"
+        : [v1] "=v" (v1->v)
+        , [sig] "+r" (sig)
+        : [v3] "v" (v3->v)
+        , [i2] "i" (i2)
+        , [m4] "i" (m4));
+
+    return sig;
+}
+
+int main(int argc, char *argv[])
+{
+    S390Vector v3 = {.d[0] = 1, .d[1] = 2};
+    struct sigaction act;
+    S390Vector v1;
+    int err;
+
+    memset(&act, 0, sizeof(act));
+    act.sa_sigaction = handle_sigill;
+    act.sa_flags = SA_SIGINFO;
+    err = sigaction(SIGILL, &act, NULL);
+    assert(err == 0);
+
+    assert(vrep(&v1, &v3, 7, 0) == -1);
+    assert(v1.d[0] == 0x0101010101010101ULL);
+    assert(v1.d[1] == 0x0101010101010101ULL);
+
+    assert(vrep(&v1, &v3, 7, 1) == -1);
+    assert(v1.d[0] == 0x0002000200020002ULL);
+    assert(v1.d[1] == 0x0002000200020002ULL);
+
+    assert(vrep(&v1, &v3, 1, 2) == -1);
+    assert(v1.d[0] == 0x0000000100000001ULL);
+    assert(v1.d[1] == 0x0000000100000001ULL);
+
+    assert(vrep(&v1, &v3, 1, 3) == -1);
+    assert(v1.d[0] == 2);
+    assert(v1.d[1] == 2);
+
+    assert(vrep(&v1, &v3, 0x10, 0) == SIGILL);
+    assert(vrep(&v1, &v3, 0x101, 0) == SIGILL);
+    assert(vrep(&v1, &v3, 0x8, 1) == SIGILL);
+    assert(vrep(&v1, &v3, 0x108, 1) == SIGILL);
+    assert(vrep(&v1, &v3, 0x4, 2) == SIGILL);
+    assert(vrep(&v1, &v3, 0x104, 2) == SIGILL);
+    assert(vrep(&v1, &v3, 0x2, 3) == SIGILL);
+    assert(vrep(&v1, &v3, 0x102, 3) == SIGILL);
+
+    return EXIT_SUCCESS;
+}