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, 112 insertions, 0 deletions

diff --git a/target/rx/gdbstub.c b/target/rx/gdbstub.c
new file mode 100644
index 000000000..c811d4810
--- /dev/null
+++ b/target/rx/gdbstub.c
@@ -0,0 +1,112 @@
+/*
+ * RX gdb server stub
+ *
+ * Copyright (c) 2019 Yoshinori Sato
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 "qemu/osdep.h"
+#include "qemu-common.h"
+#include "cpu.h"
+#include "exec/gdbstub.h"
+
+int rx_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
+{
+    RXCPU *cpu = RX_CPU(cs);
+    CPURXState *env = &cpu->env;
+
+    switch (n) {
+    case 0 ... 15:
+        return gdb_get_regl(mem_buf, env->regs[n]);
+    case 16:
+        return gdb_get_regl(mem_buf, (env->psw_u) ? env->regs[0] : env->usp);
+    case 17:
+        return gdb_get_regl(mem_buf, (!env->psw_u) ? env->regs[0] : env->isp);
+    case 18:
+        return gdb_get_regl(mem_buf, rx_cpu_pack_psw(env));
+    case 19:
+        return gdb_get_regl(mem_buf, env->pc);
+    case 20:
+        return gdb_get_regl(mem_buf, env->intb);
+    case 21:
+        return gdb_get_regl(mem_buf, env->bpsw);
+    case 22:
+        return gdb_get_regl(mem_buf, env->bpc);
+    case 23:
+        return gdb_get_regl(mem_buf, env->fintv);
+    case 24:
+        return gdb_get_regl(mem_buf, env->fpsw);
+    case 25:
+        return 0;
+    }
+    return 0;
+}
+
+int rx_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    RXCPU *cpu = RX_CPU(cs);
+    CPURXState *env = &cpu->env;
+    uint32_t psw;
+    switch (n) {
+    case 0 ... 15:
+        env->regs[n] = ldl_p(mem_buf);
+        if (n == 0) {
+            if (env->psw_u) {
+                env->usp = env->regs[0];
+            } else {
+                env->isp = env->regs[0];
+            }
+        }
+        break;
+    case 16:
+        env->usp = ldl_p(mem_buf);
+        if (env->psw_u) {
+            env->regs[0] = ldl_p(mem_buf);
+        }
+        break;
+    case 17:
+        env->isp = ldl_p(mem_buf);
+        if (!env->psw_u) {
+            env->regs[0] = ldl_p(mem_buf);
+        }
+        break;
+    case 18:
+        psw = ldl_p(mem_buf);
+        rx_cpu_unpack_psw(env, psw, 1);
+        break;
+    case 19:
+        env->pc = ldl_p(mem_buf);
+        break;
+    case 20:
+        env->intb = ldl_p(mem_buf);
+        break;
+    case 21:
+        env->bpsw = ldl_p(mem_buf);
+        break;
+    case 22:
+        env->bpc = ldl_p(mem_buf);
+        break;
+    case 23:
+        env->fintv = ldl_p(mem_buf);
+        break;
+    case 24:
+        env->fpsw = ldl_p(mem_buf);
+        break;
+    case 25:
+        return 8;
+    default:
+        return 0;
+    }
+
+    return 4;
+}