linux-user: Add signal handling for AArch64

This patch adds signal handling for AArch64. The code is based on the
respective source in the Linux kernel.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: John Rigby <john.rigby@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1378235544-22290-17-git-send-email-peter.maydell@linaro.org
Message-id: 1368505980-17151-10-git-send-email-john.rigby@linaro.org
[PMM: fixed style nits: tabs, long lines;
 pulled target_signal.h in from a later patch; it fits better here]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/linux-user/aarch64/target_signal.h b/linux-user/aarch64/target_signal.h
new file mode 100644
index 0000000000..e8c677de11
--- /dev/null
+++ b/linux-user/aarch64/target_signal.h
@@ -0,0 +1,29 @@
+#ifndef TARGET_SIGNAL_H
+#define TARGET_SIGNAL_H
+
+#include "cpu.h"
+
+/* 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_MINSIGSTKSZ 2048
+#define TARGET_SIGSTKSZ 8192
+
+static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
+{
+   return state->xregs[31];
+}
+
+#endif /* TARGET_SIGNAL_H */