Contexts for RT debugging

[lttng-modules.git] / wrapper / irqflags.h

diff --git a/wrapper/irqflags.h b/wrapper/irqflags.h
new file mode 100644 (file)
index 0000000..77f8382
--- /dev/null
+++ b/wrapper/irqflags.h
@@ -0,0 +1,53 @@
+#ifndef _LTTNG_WRAPPER_IRQFLAGS_H
+#define _LTTNG_WRAPPER_IRQFLAGS_H
+
+/*
+ * wrapper/irqflags.h
+ *
+ * wrapper around IRQ flags.
+ *
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/version.h>
+#include <linux/irqflags.h>
+
+#ifdef CONFIG_X86
+
+static inline
+int lttng_regs_irqs_disabled(struct pt_regs *regs)
+{
+       unsigned long flags = regs->flags;
+
+       return arch_irqs_disabled_flags(flags);
+}
+
+#else
+/*
+ * lttng_regs_irqs_disabled() returns -1 if irqoff state is unknown.
+ * TODO: should implement lttng_regs_irqs_disabled for each architecture
+ * to add interruptible context for kprobes and kretprobes.
+ */
+
+static inline
+int lttng_regs_irqs_disabled(struct pt_regs *regs)
+{
+       return -1;
+}
+#endif
+
+#endif /* _LTTNG_WRAPPER_IRQFLAGS_H */