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, 38 insertions, 0 deletions

diff --git a/linux-user/nios2/target_syscall.h b/linux-user/nios2/target_syscall.h
new file mode 100644
index 000000000..78006c24d
--- /dev/null
+++ b/linux-user/nios2/target_syscall.h
@@ -0,0 +1,38 @@
+#ifndef NIOS2_TARGET_SYSCALL_H
+#define NIOS2_TARGET_SYSCALL_H
+
+#define UNAME_MACHINE "nios2"
+#define UNAME_MINIMUM_RELEASE "3.19.0"
+
+struct target_pt_regs {
+    unsigned long  r8;    /* r8-r15 Caller-saved GP registers */
+    unsigned long  r9;
+    unsigned long  r10;
+    unsigned long  r11;
+    unsigned long  r12;
+    unsigned long  r13;
+    unsigned long  r14;
+    unsigned long  r15;
+    unsigned long  r1;    /* Assembler temporary */
+    unsigned long  r2;    /* Retval LS 32bits */
+    unsigned long  r3;    /* Retval MS 32bits */
+    unsigned long  r4;    /* r4-r7 Register arguments */
+    unsigned long  r5;
+    unsigned long  r6;
+    unsigned long  r7;
+    unsigned long  orig_r2;    /* Copy of r2 ?? */
+    unsigned long  ra;    /* Return address */
+    unsigned long  fp;    /* Frame pointer */
+    unsigned long  sp;    /* Stack pointer */
+    unsigned long  gp;    /* Global pointer */
+    unsigned long  estatus;
+    unsigned long  ea;    /* Exception return address (pc) */
+    unsigned long  orig_r7;
+};
+
+#define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
+
+#endif /* NIOS2_TARGET_SYSCALL_H */