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, 430 insertions, 0 deletions

diff --git a/target/microblaze/op_helper.c b/target/microblaze/op_helper.c
new file mode 100644
index 000000000..58d633584
--- /dev/null
+++ b/target/microblaze/op_helper.c
@@ -0,0 +1,430 @@
+/*
+ *  Microblaze helper routines.
+ *
+ *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>.
+ *  Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
+ *
+ * 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 "cpu.h"
+#include "exec/helper-proto.h"
+#include "qemu/host-utils.h"
+#include "exec/exec-all.h"
+#include "exec/cpu_ldst.h"
+#include "fpu/softfloat.h"
+
+void helper_put(uint32_t id, uint32_t ctrl, uint32_t data)
+{
+    int test = ctrl & STREAM_TEST;
+    int atomic = ctrl & STREAM_ATOMIC;
+    int control = ctrl & STREAM_CONTROL;
+    int nonblock = ctrl & STREAM_NONBLOCK;
+    int exception = ctrl & STREAM_EXCEPTION;
+
+    qemu_log_mask(LOG_UNIMP, "Unhandled stream put to stream-id=%d data=%x %s%s%s%s%s\n",
+             id, data,
+             test ? "t" : "",
+             nonblock ? "n" : "",
+             exception ? "e" : "",
+             control ? "c" : "",
+             atomic ? "a" : "");
+}
+
+uint32_t helper_get(uint32_t id, uint32_t ctrl)
+{
+    int test = ctrl & STREAM_TEST;
+    int atomic = ctrl & STREAM_ATOMIC;
+    int control = ctrl & STREAM_CONTROL;
+    int nonblock = ctrl & STREAM_NONBLOCK;
+    int exception = ctrl & STREAM_EXCEPTION;
+
+    qemu_log_mask(LOG_UNIMP, "Unhandled stream get from stream-id=%d %s%s%s%s%s\n",
+             id,
+             test ? "t" : "",
+             nonblock ? "n" : "",
+             exception ? "e" : "",
+             control ? "c" : "",
+             atomic ? "a" : "");
+    return 0xdead0000 | id;
+}
+
+void helper_raise_exception(CPUMBState *env, uint32_t index)
+{
+    CPUState *cs = env_cpu(env);
+
+    cs->exception_index = index;
+    cpu_loop_exit(cs);
+}
+
+static bool check_divz(CPUMBState *env, uint32_t a, uint32_t b, uintptr_t ra)
+{
+    if (unlikely(b == 0)) {
+        env->msr |= MSR_DZ;
+
+        if ((env->msr & MSR_EE) &&
+            env_archcpu(env)->cfg.div_zero_exception) {
+            CPUState *cs = env_cpu(env);
+
+            env->esr = ESR_EC_DIVZERO;
+            cs->exception_index = EXCP_HW_EXCP;
+            cpu_loop_exit_restore(cs, ra);
+        }
+        return false;
+    }
+    return true;
+}
+
+uint32_t helper_divs(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    if (!check_divz(env, a, b, GETPC())) {
+        return 0;
+    }
+    return (int32_t)a / (int32_t)b;
+}
+
+uint32_t helper_divu(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    if (!check_divz(env, a, b, GETPC())) {
+        return 0;
+    }
+    return a / b;
+}
+
+/* raise FPU exception.  */
+static void raise_fpu_exception(CPUMBState *env, uintptr_t ra)
+{
+    CPUState *cs = env_cpu(env);
+
+    env->esr = ESR_EC_FPU;
+    cs->exception_index = EXCP_HW_EXCP;
+    cpu_loop_exit_restore(cs, ra);
+}
+
+static void update_fpu_flags(CPUMBState *env, int flags, uintptr_t ra)
+{
+    int raise = 0;
+
+    if (flags & float_flag_invalid) {
+        env->fsr |= FSR_IO;
+        raise = 1;
+    }
+    if (flags & float_flag_divbyzero) {
+        env->fsr |= FSR_DZ;
+        raise = 1;
+    }
+    if (flags & float_flag_overflow) {
+        env->fsr |= FSR_OF;
+        raise = 1;
+    }
+    if (flags & float_flag_underflow) {
+        env->fsr |= FSR_UF;
+        raise = 1;
+    }
+    if (raise
+        && (env_archcpu(env)->cfg.pvr_regs[2] & PVR2_FPU_EXC_MASK)
+        && (env->msr & MSR_EE)) {
+        raise_fpu_exception(env, ra);
+    }
+}
+
+uint32_t helper_fadd(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fd, fa, fb;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    fd.f = float32_add(fa.f, fb.f, &env->fp_status);
+
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+    return fd.l;
+}
+
+uint32_t helper_frsub(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fd, fa, fb;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    fd.f = float32_sub(fb.f, fa.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+    return fd.l;
+}
+
+uint32_t helper_fmul(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fd, fa, fb;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    fd.f = float32_mul(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+
+    return fd.l;
+}
+
+uint32_t helper_fdiv(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fd, fa, fb;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    fd.f = float32_div(fb.f, fa.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+
+    return fd.l;
+}
+
+uint32_t helper_fcmp_un(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    uint32_t r = 0;
+
+    fa.l = a;
+    fb.l = b;
+
+    if (float32_is_signaling_nan(fa.f, &env->fp_status) ||
+        float32_is_signaling_nan(fb.f, &env->fp_status)) {
+        update_fpu_flags(env, float_flag_invalid, GETPC());
+        r = 1;
+    }
+
+    if (float32_is_quiet_nan(fa.f, &env->fp_status) ||
+        float32_is_quiet_nan(fb.f, &env->fp_status)) {
+        r = 1;
+    }
+
+    return r;
+}
+
+uint32_t helper_fcmp_lt(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int r;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    r = float32_lt(fb.f, fa.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+
+    return r;
+}
+
+uint32_t helper_fcmp_eq(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int flags;
+    int r;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fb.l = b;
+    r = float32_eq_quiet(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+
+    return r;
+}
+
+uint32_t helper_fcmp_le(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int flags;
+    int r;
+
+    fa.l = a;
+    fb.l = b;
+    set_float_exception_flags(0, &env->fp_status);
+    r = float32_le(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+
+
+    return r;
+}
+
+uint32_t helper_fcmp_gt(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int flags, r;
+
+    fa.l = a;
+    fb.l = b;
+    set_float_exception_flags(0, &env->fp_status);
+    r = float32_lt(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+    return r;
+}
+
+uint32_t helper_fcmp_ne(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int flags, r;
+
+    fa.l = a;
+    fb.l = b;
+    set_float_exception_flags(0, &env->fp_status);
+    r = !float32_eq_quiet(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+
+    return r;
+}
+
+uint32_t helper_fcmp_ge(CPUMBState *env, uint32_t a, uint32_t b)
+{
+    CPU_FloatU fa, fb;
+    int flags, r;
+
+    fa.l = a;
+    fb.l = b;
+    set_float_exception_flags(0, &env->fp_status);
+    r = !float32_lt(fa.f, fb.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags & float_flag_invalid, GETPC());
+
+    return r;
+}
+
+uint32_t helper_flt(CPUMBState *env, uint32_t a)
+{
+    CPU_FloatU fd, fa;
+
+    fa.l = a;
+    fd.f = int32_to_float32(fa.l, &env->fp_status);
+    return fd.l;
+}
+
+uint32_t helper_fint(CPUMBState *env, uint32_t a)
+{
+    CPU_FloatU fa;
+    uint32_t r;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    r = float32_to_int32(fa.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+
+    return r;
+}
+
+uint32_t helper_fsqrt(CPUMBState *env, uint32_t a)
+{
+    CPU_FloatU fd, fa;
+    int flags;
+
+    set_float_exception_flags(0, &env->fp_status);
+    fa.l = a;
+    fd.l = float32_sqrt(fa.f, &env->fp_status);
+    flags = get_float_exception_flags(&env->fp_status);
+    update_fpu_flags(env, flags, GETPC());
+
+    return fd.l;
+}
+
+uint32_t helper_pcmpbf(uint32_t a, uint32_t b)
+{
+    unsigned int i;
+    uint32_t mask = 0xff000000;
+
+    for (i = 0; i < 4; i++) {
+        if ((a & mask) == (b & mask))
+            return i + 1;
+        mask >>= 8;
+    }
+    return 0;
+}
+
+void helper_stackprot(CPUMBState *env, target_ulong addr)
+{
+    if (addr < env->slr || addr > env->shr) {
+        CPUState *cs = env_cpu(env);
+
+        qemu_log_mask(CPU_LOG_INT, "Stack protector violation at "
+                      TARGET_FMT_lx " %x %x\n",
+                      addr, env->slr, env->shr);
+
+        env->ear = addr;
+        env->esr = ESR_EC_STACKPROT;
+        cs->exception_index = EXCP_HW_EXCP;
+        cpu_loop_exit_restore(cs, GETPC());
+    }
+}
+
+#if !defined(CONFIG_USER_ONLY)
+/* Writes/reads to the MMU's special regs end up here.  */
+uint32_t helper_mmu_read(CPUMBState *env, uint32_t ext, uint32_t rn)
+{
+    return mmu_read(env, ext, rn);
+}
+
+void helper_mmu_write(CPUMBState *env, uint32_t ext, uint32_t rn, uint32_t v)
+{
+    mmu_write(env, ext, rn, v);
+}
+
+void mb_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr,
+                               unsigned size, MMUAccessType access_type,
+                               int mmu_idx, MemTxAttrs attrs,
+                               MemTxResult response, uintptr_t retaddr)
+{
+    MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
+    CPUMBState *env = &cpu->env;
+
+    qemu_log_mask(CPU_LOG_INT, "Transaction failed: vaddr 0x%" VADDR_PRIx
+                  " physaddr 0x" TARGET_FMT_plx " size %d access type %s\n",
+                  addr, physaddr, size,
+                  access_type == MMU_INST_FETCH ? "INST_FETCH" :
+                  (access_type == MMU_DATA_LOAD ? "DATA_LOAD" : "DATA_STORE"));
+
+    if (!(env->msr & MSR_EE)) {
+        return;
+    }
+
+    if (access_type == MMU_INST_FETCH) {
+        if (!cpu->cfg.iopb_bus_exception) {
+            return;
+        }
+        env->esr = ESR_EC_INSN_BUS;
+    } else {
+        if (!cpu->cfg.dopb_bus_exception) {
+            return;
+        }
+        env->esr = ESR_EC_DATA_BUS;
+    }
+
+    env->ear = addr;
+    cs->exception_index = EXCP_HW_EXCP;
+    cpu_loop_exit_restore(cs, retaddr);
+}
+#endif