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, 88 insertions, 0 deletions

diff --git a/linux-user/hppa/target_signal.h b/linux-user/hppa/target_signal.h
new file mode 100644
index 000000000..d558119ee
--- /dev/null
+++ b/linux-user/hppa/target_signal.h
@@ -0,0 +1,88 @@
+#ifndef HPPA_TARGET_SIGNAL_H
+#define HPPA_TARGET_SIGNAL_H
+
+#define TARGET_SIGHUP           1
+#define TARGET_SIGINT           2
+#define TARGET_SIGQUIT          3
+#define TARGET_SIGILL           4
+#define TARGET_SIGTRAP          5
+#define TARGET_SIGABRT          6
+#define TARGET_SIGIOT           6
+#define TARGET_SIGSTKFLT        7
+#define TARGET_SIGFPE           8
+#define TARGET_SIGKILL          9
+#define TARGET_SIGBUS          10
+#define TARGET_SIGSEGV         11
+#define TARGET_SIGXCPU         12
+#define TARGET_SIGPIPE         13
+#define TARGET_SIGALRM         14
+#define TARGET_SIGTERM         15
+#define TARGET_SIGUSR1         16
+#define TARGET_SIGUSR2         17
+#define TARGET_SIGCHLD         18
+#define TARGET_SIGPWR          19
+#define TARGET_SIGVTALRM       20
+#define TARGET_SIGPROF         21
+#define TARGET_SIGIO           22
+#define TARGET_SIGPOLL         TARGET_SIGIO
+#define TARGET_SIGWINCH        23
+#define TARGET_SIGSTOP         24
+#define TARGET_SIGTSTP         25
+#define TARGET_SIGCONT         26
+#define TARGET_SIGTTIN         27
+#define TARGET_SIGTTOU         28
+#define TARGET_SIGURG          29
+#define TARGET_SIGXFSZ         30
+#define TARGET_SIGSYS          31
+#define TARGET_SIGRTMIN        32
+
+#define TARGET_SIG_BLOCK       0
+#define TARGET_SIG_UNBLOCK     1
+#define TARGET_SIG_SETMASK     2
+
+/* this struct defines a stack used during syscall handling */
+
+typedef struct target_sigaltstack {
+    abi_ulong ss_sp;
+    abi_int ss_flags;
+    abi_ulong ss_size;
+} target_stack_t;
+
+
+/*
+ * sigaltstack controls
+ */
+#define TARGET_SS_ONSTACK	1
+#define TARGET_SS_DISABLE	2
+
+#define TARGET_SA_ONSTACK       0x00000001
+#define TARGET_SA_RESETHAND     0x00000004
+#define TARGET_SA_NOCLDSTOP     0x00000008
+#define TARGET_SA_SIGINFO       0x00000010
+#define TARGET_SA_NODEFER       0x00000020
+#define TARGET_SA_RESTART       0x00000040
+#define TARGET_SA_NOCLDWAIT     0x00000080
+
+#define TARGET_MINSIGSTKSZ	2048
+#define TARGET_SIGSTKSZ		8192
+
+/* bit-flags */
+#define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */
+/* mask for all SS_xxx flags */
+#define TARGET_SS_FLAG_BITS  TARGET_SS_AUTODISARM
+
+/*
+ * We cannot use a bare sigtramp page for hppa-linux.
+ *
+ * Unlike other guests where we use the instructions at PC to validate
+ * an offset from SP, the hppa libgcc signal frame fallback unwinding uses
+ * the PC address itself to find the frame.  This is due to the fact that
+ * the hppa grows the stack upward, and the frame is of unknown size.
+ *
+ * TODO: We should be able to use a VDSO to address this, by providing
+ * proper unwind info for the sigtramp code, at which point the fallback
+ * unwinder will not be used.
+ */
+#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0
+
+#endif /* HPPA_TARGET_SIGNAL_H */