Cleanup: Move wrapper/ headers to include/wrapper/

[lttng-modules.git] / include / wrapper / kallsyms.h

diff --git a/include/wrapper/kallsyms.h b/include/wrapper/kallsyms.h
new file mode 100644 (file)
index 0000000..7f4d830
--- /dev/null
+++ b/include/wrapper/kallsyms.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
+ * wrapper/kallsyms.h
+ *
+ * wrapper around kallsyms_lookup_name. Implements arch-dependent code for
+ * arches where the address of the start of the function body is different
+ * from the pointer which can be used to call the function, e.g. ARM THUMB2.
+ *
+ * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org)
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_WRAPPER_KALLSYMS_H
+#define _LTTNG_WRAPPER_KALLSYMS_H
+
+#include <linux/kallsyms.h>
+#include <linux/version.h>
+
+/*
+ * PowerPC ABIv1 needs KALLSYMS_ALL to get the function descriptor,
+ * which is needed to perform the function call.
+ */
+#if defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF < 2)
+# ifndef CONFIG_KALLSYMS_ALL
+#  error "LTTng-modules requires CONFIG_KALLSYMS_ALL on PowerPC ABIv1"
+# endif
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
+
+unsigned long wrapper_kallsyms_lookup_name(const char *name);
+
+#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
+static inline
+unsigned long wrapper_kallsyms_lookup_name(const char *name)
+{
+       return kallsyms_lookup_name(name);
+}
+
+#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
+
+static inline
+unsigned long kallsyms_lookup_funcptr(const char *name)
+{
+       unsigned long addr;
+
+       addr = wrapper_kallsyms_lookup_name(name);
+#ifdef CONFIG_ARM
+#ifdef CONFIG_THUMB2_KERNEL
+       if (addr)
+               addr |= 1; /* set bit 0 in address for thumb mode */
+#endif
+#endif
+       return addr;
+}
+
+static inline
+unsigned long kallsyms_lookup_dataptr(const char *name)
+{
+       return wrapper_kallsyms_lookup_name(name);
+}
+
+#endif /* _LTTNG_WRAPPER_KALLSYMS_H */