2 files changed, 42 insertions, 0 deletions
diff --git a/linux-user/generic/signal.h b/linux-user/generic/signal.h
index 943bc1a1e2..6fd05b77bb 100644
--- a/linux-user/generic/signal.h
+++ b/linux-user/generic/signal.h
@@ -55,6 +55,21 @@
 #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
+
 /* bit-flags */
 #define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */
 /* mask for all SS_xxx flags */
diff --git a/linux-user/generic/target_prctl_unalign.h b/linux-user/generic/target_prctl_unalign.h
new file mode 100644
index 0000000000..bc3b83af2a
--- /dev/null
+++ b/linux-user/generic/target_prctl_unalign.h
@@ -0,0 +1,27 @@
+/*
+ * Generic prctl unalign functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef GENERIC_TARGET_PRCTL_UNALIGN_H
+#define GENERIC_TARGET_PRCTL_UNALIGN_H
+
+static abi_long do_prctl_get_unalign(CPUArchState *env, target_long arg2)
+{
+    CPUState *cs = env_cpu(env);
+    uint32_t res = PR_UNALIGN_NOPRINT;
+    if (cs->prctl_unalign_sigbus) {
+        res |= PR_UNALIGN_SIGBUS;
+    }
+    return put_user_u32(res, arg2);
+}
+#define do_prctl_get_unalign do_prctl_get_unalign
+
+static abi_long do_prctl_set_unalign(CPUArchState *env, target_long arg2)
+{
+    env_cpu(env)->prctl_unalign_sigbus = arg2 & PR_UNALIGN_SIGBUS;
+    return 0;
+}
+#define do_prctl_set_unalign do_prctl_set_unalign
+
+#endif /* GENERIC_TARGET_PRCTL_UNALIGN_H */