linux-user: create a dummy per arch signal.c

Create a signal-common.h for future use by these new files
and use it in the existing signal.c

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180424192635.6027-2-laurent@vivier.eu>

1 files changed, 50 insertions, 0 deletions

diff --git a/linux-user/signal-common.h b/linux-user/signal-common.h
new file mode 100644
index 0000000..838b6e9
--- /dev/null
+++ b/linux-user/signal-common.h
@@ -0,0 +1,50 @@
+/*
+ *  Emulation of Linux signals
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SIGNAL_COMMON_H
+#define SIGNAL_COMMON_H
+extern struct target_sigaltstack target_sigaltstack_used;
+
+static inline int on_sig_stack(unsigned long sp)
+{
+    return (sp - target_sigaltstack_used.ss_sp
+            < target_sigaltstack_used.ss_size);
+}
+
+static inline int sas_ss_flags(unsigned long sp)
+{
+    return (target_sigaltstack_used.ss_size == 0 ? SS_DISABLE
+            : on_sig_stack(sp) ? SS_ONSTACK : 0);
+}
+
+static inline void target_sigemptyset(target_sigset_t *set)
+{
+    memset(set, 0, sizeof(*set));
+}
+
+void host_to_target_sigset_internal(target_sigset_t *d,
+                                    const sigset_t *s);
+void target_to_host_sigset_internal(sigset_t *d,
+                                    const target_sigset_t *s);
+void tswap_siginfo(target_siginfo_t *tinfo,
+                   const target_siginfo_t *info);
+void set_sigmask(const sigset_t *set);
+void force_sig(int sig);
+void force_sigsegv(int oldsig);
+#endif