Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 169 insertions, 0 deletions

diff --git a/tests/tcg/hexagon/preg_alias.c b/tests/tcg/hexagon/preg_alias.c
new file mode 100644
index 000000000..0cac469b7
--- /dev/null
+++ b/tests/tcg/hexagon/preg_alias.c
@@ -0,0 +1,169 @@
+/*
+ *  Copyright(c) 2019-2021 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/>.
+ */
+
+#include <stdio.h>
+
+static inline int preg_alias(int v0, int v1, int v2, int v3)
+{
+  int ret;
+  asm volatile("p0 = %1\n\t"
+               "p1 = %2\n\t"
+               "p2 = %3\n\t"
+               "p3 = %4\n\t"
+               "%0 = C4\n"
+               : "=r"(ret)
+               : "r"(v0), "r"(v1), "r"(v2), "r"(v3)
+               : "p0", "p1", "p2", "p3");
+  return ret;
+}
+
+static inline int preg_alias_pair(int v0, int v1, int v2, int v3)
+{
+  long long c54;
+  asm volatile("p0 = %1\n\t"
+               "p1 = %2\n\t"
+               "p2 = %3\n\t"
+               "p3 = %4\n\t"
+               "%0 = C5:4\n"
+               : "=r"(c54)
+               : "r"(v0), "r"(v1), "r"(v2), "r"(v3)
+               : "p0", "p1", "p2", "p3");
+  return (int)c54;
+}
+
+typedef union {
+    int creg;
+    struct {
+      unsigned char p0;
+      unsigned char p1;
+      unsigned char p2;
+      unsigned char p3;
+    } pregs;
+} PRegs;
+
+static inline void creg_alias(int cval, PRegs *pregs)
+{
+  unsigned char val;
+  asm volatile("c4 = %0" : : "r"(cval));
+
+  asm volatile("%0 = p0" : "=r"(val));
+  pregs->pregs.p0 = val;
+  asm volatile("%0 = p1" : "=r"(val));
+  pregs->pregs.p1 = val;
+  asm volatile("%0 = p2" : "=r"(val));
+  pregs->pregs.p2 = val;
+  asm volatile("%0 = p3" : "=r"(val));
+  pregs->pregs.p3 = val;
+}
+
+int err;
+
+static void check(int val, int expect)
+{
+    if (val != expect) {
+        printf("ERROR: 0x%08x != 0x%08x\n", val, expect);
+        err++;
+    }
+}
+
+static inline void creg_alias_pair(unsigned int cval, PRegs *pregs)
+{
+  unsigned long long cval_pair = (0xdeadbeefULL << 32) | cval;
+  unsigned char val;
+  int c5;
+  asm volatile("c5:4 = %0" : : "r"(cval_pair));
+
+  asm volatile("%0 = p0" : "=r"(val));
+  pregs->pregs.p0 = val;
+  asm volatile("%0 = p1" : "=r"(val));
+  pregs->pregs.p1 = val;
+  asm volatile("%0 = p2" : "=r"(val));
+  pregs->pregs.p2 = val;
+  asm volatile("%0 = p3" : "=r"(val));
+  pregs->pregs.p3 = val;
+  asm volatile("%0 = c5" : "=r"(c5));
+  check(c5, 0xdeadbeef);
+}
+
+int main()
+{
+    int c4;
+    PRegs pregs;
+
+    c4 = preg_alias(0xff, 0x00, 0xff, 0x00);
+    check(c4, 0x00ff00ff);
+    c4 = preg_alias(0xff, 0x00, 0x00, 0x00);
+    check(c4, 0x000000ff);
+    c4 = preg_alias(0x00, 0xff, 0x00, 0x00);
+    check(c4, 0x0000ff00);
+    c4 = preg_alias(0x00, 0x00, 0xff, 0x00);
+    check(c4, 0x00ff0000);
+    c4 = preg_alias(0x00, 0x00, 0x00, 0xff);
+    check(c4, 0xff000000);
+    c4 = preg_alias(0xff, 0xff, 0xff, 0xff);
+    check(c4, 0xffffffff);
+
+    c4 = preg_alias_pair(0xff, 0x00, 0xff, 0x00);
+    check(c4, 0x00ff00ff);
+      c4 = preg_alias_pair(0xff, 0x00, 0x00, 0x00);
+    check(c4, 0x000000ff);
+    c4 = preg_alias_pair(0x00, 0xff, 0x00, 0x00);
+    check(c4, 0x0000ff00);
+    c4 = preg_alias_pair(0x00, 0x00, 0xff, 0x00);
+    check(c4, 0x00ff0000);
+    c4 = preg_alias_pair(0x00, 0x00, 0x00, 0xff);
+    check(c4, 0xff000000);
+    c4 = preg_alias_pair(0xff, 0xff, 0xff, 0xff);
+    check(c4, 0xffffffff);
+
+    creg_alias(0x00ff00ff, &pregs);
+    check(pregs.creg, 0x00ff00ff);
+    creg_alias(0x00ffff00, &pregs);
+    check(pregs.creg, 0x00ffff00);
+    creg_alias(0x00000000, &pregs);
+    check(pregs.creg, 0x00000000);
+    creg_alias(0xff000000, &pregs);
+    check(pregs.creg, 0xff000000);
+    creg_alias(0x00ff0000, &pregs);
+    check(pregs.creg, 0x00ff0000);
+    creg_alias(0x0000ff00, &pregs);
+    check(pregs.creg, 0x0000ff00);
+    creg_alias(0x000000ff, &pregs);
+    check(pregs.creg, 0x000000ff);
+    creg_alias(0xffffffff, &pregs);
+    check(pregs.creg, 0xffffffff);
+
+    creg_alias_pair(0x00ff00ff, &pregs);
+    check(pregs.creg, 0x00ff00ff);
+    creg_alias_pair(0x00ffff00, &pregs);
+    check(pregs.creg, 0x00ffff00);
+    creg_alias_pair(0x00000000, &pregs);
+    check(pregs.creg, 0x00000000);
+    creg_alias_pair(0xff000000, &pregs);
+    check(pregs.creg, 0xff000000);
+    creg_alias_pair(0x00ff0000, &pregs);
+    check(pregs.creg, 0x00ff0000);
+    creg_alias_pair(0x0000ff00, &pregs);
+    check(pregs.creg, 0x0000ff00);
+    creg_alias_pair(0x000000ff, &pregs);
+    check(pregs.creg, 0x000000ff);
+    creg_alias_pair(0xffffffff, &pregs);
+    check(pregs.creg, 0xffffffff);
+
+    puts(err ? "FAIL" : "PASS");
+    return err;
+}