+/*
+ * Copyright (C) 2020 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * 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; version 2 of the License only.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _LTTNG_UST_SIGBUS_H
+#define _LTTNG_UST_SIGBUS_H
+
+#include <urcu/list.h>
+#include <setjmp.h>
+
+struct lttng_ust_sigbus_range {
+ void *start; /* inclusive */
+ void *end; /* exclusive */
+ struct cds_list_head node;
+};
+
+struct lttng_ust_sigbus_state {
+ int jmp_ready;
+ struct cds_list_head head; /* struct lttng_ust_sigbus_range */
+ sigjmp_buf sj_env;
+};
+
+/*
+ * Define the lttng_ust_sigbus_state TLS variable as initial-exec model
+ * to allow using it from the SIGBUS signal handler. This variable must
+ * be defined by the executable using DEFINE_LTTNG_UST_SIGBUS_STATE()
+ * rather than internally within liblttng-ust-ctl.so to ensure we don't
+ * contribute to reach glibc limits of pre-allocated TLS IE model space
+ * for shared objects.
+ */
+#define DEFINE_LTTNG_UST_SIGBUS_STATE() \
+ __thread __attribute__((tls_model("initial-exec"))) struct lttng_ust_sigbus_state lttng_ust_sigbus_state
+
+extern __thread __attribute__((tls_model("initial-exec"))) struct lttng_ust_sigbus_state lttng_ust_sigbus_state;
+
+#endif /* _LTTNG_UST_SIGBUS_H */