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, 211 insertions, 0 deletions

diff --git a/target/arm/gdbstub64.c b/target/arm/gdbstub64.c
new file mode 100644
index 000000000..596878666
--- /dev/null
+++ b/target/arm/gdbstub64.c
@@ -0,0 +1,211 @@
+/*
+ * ARM gdb server stub: AArch64 specific functions.
+ *
+ * Copyright (c) 2013 SUSE LINUX Products GmbH
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "cpu.h"
+#include "internals.h"
+#include "exec/gdbstub.h"
+
+int aarch64_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+
+    if (n < 31) {
+        /* Core integer register.  */
+        return gdb_get_reg64(mem_buf, env->xregs[n]);
+    }
+    switch (n) {
+    case 31:
+        return gdb_get_reg64(mem_buf, env->xregs[31]);
+    case 32:
+        return gdb_get_reg64(mem_buf, env->pc);
+    case 33:
+        return gdb_get_reg32(mem_buf, pstate_read(env));
+    }
+    /* Unknown register.  */
+    return 0;
+}
+
+int aarch64_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+    uint64_t tmp;
+
+    tmp = ldq_p(mem_buf);
+
+    if (n < 31) {
+        /* Core integer register.  */
+        env->xregs[n] = tmp;
+        return 8;
+    }
+    switch (n) {
+    case 31:
+        env->xregs[31] = tmp;
+        return 8;
+    case 32:
+        env->pc = tmp;
+        return 8;
+    case 33:
+        /* CPSR */
+        pstate_write(env, tmp);
+        return 4;
+    }
+    /* Unknown register.  */
+    return 0;
+}
+
+int aarch64_fpu_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg)
+{
+    switch (reg) {
+    case 0 ... 31:
+    {
+        /* 128 bit FP register - quads are in LE order */
+        uint64_t *q = aa64_vfp_qreg(env, reg);
+        return gdb_get_reg128(buf, q[1], q[0]);
+    }
+    case 32:
+        /* FPSR */
+        return gdb_get_reg32(buf, vfp_get_fpsr(env));
+    case 33:
+        /* FPCR */
+        return gdb_get_reg32(buf, vfp_get_fpcr(env));
+    default:
+        return 0;
+    }
+}
+
+int aarch64_fpu_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
+{
+    switch (reg) {
+    case 0 ... 31:
+        /* 128 bit FP register */
+        {
+            uint64_t *q = aa64_vfp_qreg(env, reg);
+            q[0] = ldq_le_p(buf);
+            q[1] = ldq_le_p(buf + 8);
+            return 16;
+        }
+    case 32:
+        /* FPSR */
+        vfp_set_fpsr(env, ldl_p(buf));
+        return 4;
+    case 33:
+        /* FPCR */
+        vfp_set_fpcr(env, ldl_p(buf));
+        return 4;
+    default:
+        return 0;
+    }
+}
+
+int arm_gdb_get_svereg(CPUARMState *env, GByteArray *buf, int reg)
+{
+    ARMCPU *cpu = env_archcpu(env);
+
+    switch (reg) {
+    /* The first 32 registers are the zregs */
+    case 0 ... 31:
+    {
+        int vq, len = 0;
+        for (vq = 0; vq < cpu->sve_max_vq; vq++) {
+            len += gdb_get_reg128(buf,
+                                  env->vfp.zregs[reg].d[vq * 2 + 1],
+                                  env->vfp.zregs[reg].d[vq * 2]);
+        }
+        return len;
+    }
+    case 32:
+        return gdb_get_reg32(buf, vfp_get_fpsr(env));
+    case 33:
+        return gdb_get_reg32(buf, vfp_get_fpcr(env));
+    /* then 16 predicates and the ffr */
+    case 34 ... 50:
+    {
+        int preg = reg - 34;
+        int vq, len = 0;
+        for (vq = 0; vq < cpu->sve_max_vq; vq = vq + 4) {
+            len += gdb_get_reg64(buf, env->vfp.pregs[preg].p[vq / 4]);
+        }
+        return len;
+    }
+    case 51:
+    {
+        /*
+         * We report in Vector Granules (VG) which is 64bit in a Z reg
+         * while the ZCR works in Vector Quads (VQ) which is 128bit chunks.
+         */
+        int vq = sve_zcr_len_for_el(env, arm_current_el(env)) + 1;
+        return gdb_get_reg64(buf, vq * 2);
+    }
+    default:
+        /* gdbstub asked for something out our range */
+        qemu_log_mask(LOG_UNIMP, "%s: out of range register %d", __func__, reg);
+        break;
+    }
+
+    return 0;
+}
+
+int arm_gdb_set_svereg(CPUARMState *env, uint8_t *buf, int reg)
+{
+    ARMCPU *cpu = env_archcpu(env);
+
+    /* The first 32 registers are the zregs */
+    switch (reg) {
+    /* The first 32 registers are the zregs */
+    case 0 ... 31:
+    {
+        int vq, len = 0;
+        uint64_t *p = (uint64_t *) buf;
+        for (vq = 0; vq < cpu->sve_max_vq; vq++) {
+            env->vfp.zregs[reg].d[vq * 2 + 1] = *p++;
+            env->vfp.zregs[reg].d[vq * 2] = *p++;
+            len += 16;
+        }
+        return len;
+    }
+    case 32:
+        vfp_set_fpsr(env, *(uint32_t *)buf);
+        return 4;
+    case 33:
+        vfp_set_fpcr(env, *(uint32_t *)buf);
+        return 4;
+    case 34 ... 50:
+    {
+        int preg = reg - 34;
+        int vq, len = 0;
+        uint64_t *p = (uint64_t *) buf;
+        for (vq = 0; vq < cpu->sve_max_vq; vq = vq + 4) {
+            env->vfp.pregs[preg].p[vq / 4] = *p++;
+            len += 8;
+        }
+        return len;
+    }
+    case 51:
+        /* cannot set vg via gdbstub */
+        return 0;
+    default:
+        /* gdbstub asked for something out our range */
+        break;
+    }
+
+    return 0;
+}