1 files changed, 16 insertions, 0 deletions
diff --git a/linux-user/generic/signal.h b/linux-user/generic/signal.h
index 943bc1a1e2..ceaf8a876c 100644
--- a/linux-user/generic/signal.h
+++ b/linux-user/generic/signal.h
@@ -55,6 +55,22 @@
 #define TARGET_SIG_UNBLOCK        1    /* for unblocking signals */
 #define TARGET_SIG_SETMASK        2    /* for setting the signal mask */
 
+/* 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
+
 /* bit-flags */
 #define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */
 /* mask for all SS_xxx flags */