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, 35 insertions, 0 deletions

diff --git a/linux-user/host/arm/host-signal.h b/linux-user/host/arm/host-signal.h
new file mode 100644
index 000000000..6c095773c
--- /dev/null
+++ b/linux-user/host/arm/host-signal.h
@@ -0,0 +1,35 @@
+/*
+ * host-signal.h: signal info dependent on the host architecture
+ *
+ * Copyright (c) 2003-2005 Fabrice Bellard
+ * Copyright (c) 2021 Linaro Limited
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef ARM_HOST_SIGNAL_H
+#define ARM_HOST_SIGNAL_H
+
+static inline uintptr_t host_signal_pc(ucontext_t *uc)
+{
+    return uc->uc_mcontext.arm_pc;
+}
+
+static inline void host_signal_set_pc(ucontext_t *uc, uintptr_t pc)
+{
+    uc->uc_mcontext.arm_pc = pc;
+}
+
+static inline bool host_signal_write(siginfo_t *info, ucontext_t *uc)
+{
+    /*
+     * In the FSR, bit 11 is WnR, assuming a v6 or
+     * later processor.  On v5 we will always report
+     * this as a read, which will fail later.
+     */
+    uint32_t fsr = uc->uc_mcontext.error_code;
+    return extract32(fsr, 11, 1);
+}
+
+#endif