[PATCH 02/11] tests/tcg/hexagon: check priv instructions raise SIGILL

[Brian Cain <brian.cain@oss.qualcomm.com>]

A_PRIV and A_GUEST instructions executed from user mode raise
HEX_CAUSE_PRIV_USER_NO_SINSN and HEX_CAUSE_PRIV_USER_NO_GINSN, which aborted
qemu-hexagon until the preceding patch.

Signed-off-by: Brian Cain <brian.cain@oss.qualcomm.com>
---
 tests/tcg/hexagon/privileged-insn.c | 79 +++++++++++++++++++++++++++++
 tests/tcg/hexagon/Makefile.target   |  1 +
 2 files changed, 80 insertions(+)
 create mode 100644 tests/tcg/hexagon/privileged-insn.c

diff --git a/tests/tcg/hexagon/privileged-insn.c b/tests/tcg/hexagon/privileged-insn.c
new file mode 100644
index 00000000000..306d4542ea4
--- /dev/null
+++ b/tests/tcg/hexagon/privileged-insn.c
@@ -0,0 +1,79 @@
+/*
+ * Test that privileged and guest-mode instructions raise SIGILL in user mode.
+ *
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <assert.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void *resume_pc;
+
+static void handle_sigill(int sig, siginfo_t *info, void *puc)
+{
+    ucontext_t *uc = (ucontext_t *)puc;
+
+    if (sig != SIGILL) {
+        _exit(EXIT_FAILURE);
+    }
+
+    uc->uc_mcontext.r0 = SIGILL;
+    uc->uc_mcontext.pc = (unsigned long)resume_pc;
+}
+
+static int test_priv_insn(void)
+{
+    int sig;
+
+    asm volatile(
+        "r0 = #0\n"
+        "r1 = ##1f\n"
+        "memw(%[pc]) = r1\n"
+        "stop(r0)\n"
+        "1:\n"
+        "%[sig] = r0\n"
+        : [sig] "=r"(sig)
+        : [pc] "r"(&resume_pc)
+        : "r0", "r1", "memory");
+
+    return sig;
+}
+
+static int test_guest_insn(void)
+{
+    int sig;
+
+    asm volatile(
+        "r0 = #0\n"
+        "r1 = ##1f\n"
+        "memw(%[pc]) = r1\n"
+        "r0 = g0\n"
+        "1:\n"
+        "%[sig] = r0\n"
+        : [sig] "=r"(sig)
+        : [pc] "r"(&resume_pc)
+        : "r0", "r1", "memory");
+
+    return sig;
+}
+
+int main()
+{
+    struct sigaction act;
+
+    memset(&act, 0, sizeof(act));
+    act.sa_sigaction = handle_sigill;
+    act.sa_flags = SA_SIGINFO;
+    assert(sigaction(SIGILL, &act, NULL) == 0);
+
+    assert(test_priv_insn() == SIGILL);
+    assert(test_guest_insn() == SIGILL);
+
+    puts("PASS");
+    return EXIT_SUCCESS;
+}
diff --git a/tests/tcg/hexagon/Makefile.target b/tests/tcg/hexagon/Makefile.target
index 61adf6356e4..641f6bc10e7 100644
--- a/tests/tcg/hexagon/Makefile.target
+++ b/tests/tcg/hexagon/Makefile.target
@@ -58,6 +58,7 @@ HEX_TESTS += invalid-slots
 HEX_TESTS += valid-slots
 HEX_TESTS += invalid-encoding
 HEX_TESTS += multiple-writes
+HEX_TESTS += privileged-insn
 HEX_TESTS += unaligned_pc
 HEX_TESTS += unaligned_data
 
-- 
2.34.1