1 files changed, 146 insertions, 0 deletions
diff --git a/tests/tcg/hexagon/mem_noshuf_exception.c b/tests/tcg/hexagon/mem_noshuf_exception.c
new file mode 100644
index 0000000000..08660ea3e1
--- /dev/null
+++ b/tests/tcg/hexagon/mem_noshuf_exception.c
@@ -0,0 +1,146 @@
+/*
+ *  Copyright(c) 2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Test the VLIW semantics of exceptions with mem_noshuf
+ *
+ * When a packet has the :mem_noshuf attribute, the semantics dictate
+ * That the load will get the data from the store if the addresses overlap.
+ * To accomplish this, we perform the store first.  However, we have to
+ * handle the case where the store raises an exception.  In that case, the
+ * store should not alter the machine state.
+ *
+ * We test this with a mem_noshuf packet with a store to a global variable,
+ * "should_not_change" and a load from NULL.  After the SIGSEGV is caught,
+ * we check * that the "should_not_change" value is the same.
+ *
+ * We also check that a predicated load where the predicate is false doesn't
+ * raise an exception and allows the store to happen.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <setjmp.h>
+#include <signal.h>
+
+int err;
+int segv_caught;
+
+#define SHOULD_NOT_CHANGE_VAL        5
+int should_not_change = SHOULD_NOT_CHANGE_VAL;
+
+#define OK_TO_CHANGE_VAL        13
+int ok_to_change = OK_TO_CHANGE_VAL;
+
+static void __check(const char *filename, int line, int x, int expect)
+{
+    if (x != expect) {
+        printf("ERROR %s:%d - %d != %d\n",
+               filename, line, x, expect);
+        err++;
+    }
+}
+
+#define check(x, expect) __check(__FILE__, __LINE__, (x), (expect))
+
+static void __chk_error(const char *filename, int line, int ret)
+{
+    if (ret < 0) {
+        printf("ERROR %s:%d - %d\n", filename, line, ret);
+        err++;
+    }
+}
+
+#define chk_error(ret) __chk_error(__FILE__, __LINE__, (ret))
+
+jmp_buf jmp_env;
+
+static void sig_segv(int sig, siginfo_t *info, void *puc)
+{
+    check(sig, SIGSEGV);
+    segv_caught = 1;
+    longjmp(jmp_env, 1);
+}
+
+int main()
+{
+    struct sigaction act;
+    int dummy32;
+    long long dummy64;
+    void *p;
+
+    /* SIGSEGV test */
+    act.sa_sigaction = sig_segv;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_SIGINFO;
+    chk_error(sigaction(SIGSEGV, &act, NULL));
+    if (setjmp(jmp_env) == 0) {
+        asm volatile("r18 = ##should_not_change\n\t"
+                     "r19 = #0\n\t"
+                     "{\n\t"
+                     "    memw(r18) = #7\n\t"
+                     "    %0 = memw(r19)\n\t"
+                     "}:mem_noshuf\n\t"
+                      : "=r"(dummy32) : : "r18", "r19", "memory");
+    }
+
+    act.sa_handler = SIG_DFL;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = 0;
+    chk_error(sigaction(SIGSEGV, &act, NULL));
+
+    check(segv_caught, 1);
+    check(should_not_change, SHOULD_NOT_CHANGE_VAL);
+
+    /*
+     * Check that a predicated load where the predicate is false doesn't
+     * raise an exception and allows the store to happen.
+     */
+    asm volatile("r18 = ##ok_to_change\n\t"
+                 "r19 = #0\n\t"
+                 "p0 = cmp.gt(r0, r0)\n\t"
+                 "{\n\t"
+                 "    memw(r18) = #7\n\t"
+                 "    if (p0) %0 = memw(r19)\n\t"
+                 "}:mem_noshuf\n\t"
+                  : "=r"(dummy32) : : "r18", "r19", "p0", "memory");
+
+    check(ok_to_change, 7);
+
+    /*
+     * Also check that the post-increment doesn't happen when the
+     * predicate is false.
+     */
+    ok_to_change = OK_TO_CHANGE_VAL;
+    p = NULL;
+    asm volatile("r18 = ##ok_to_change\n\t"
+                 "p0 = cmp.gt(r0, r0)\n\t"
+                 "{\n\t"
+                 "    memw(r18) = #9\n\t"
+                 "    if (p0) %1 = memd(%0 ++ #8)\n\t"
+                 "}:mem_noshuf\n\t"
+                  : "+r"(p), "=r"(dummy64) : : "r18", "p0", "memory");
+
+    check(ok_to_change, 9);
+    check((int)p, (int)NULL);
+
+    puts(err ? "FAIL" : "PASS");
+    return err ? EXIT_FAILURE : EXIT_SUCCESS;
+}