fix: kallsyms wrapper on ppc64el

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

diff --git a/wrapper/kallsyms.h b/wrapper/kallsyms.h
index eb904e06d497bdf72919e20afed07fd6a00138eb..2e5f123c1ef6147fcc2fe8ecbad959ea19407a6c 100644 (file)
--- a/wrapper/kallsyms.h
+++ b/wrapper/kallsyms.h
@@ -1,24 +1,59 @@
-#ifndef _LTTNG_WRAPPER_KALLSYMS_H
-#define _LTTNG_WRAPPER_KALLSYMS_H
-
-/*
- * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org)
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
+ * 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.
  *
- * Dual LGPL v2.1/GPL v2 license.
+ * 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 <lttng-kernel-version.h>
+
+/* CONFIG_PPC64_ELF_ABI_V1/V2 were introduced in v5.19 */
+#if defined(CONFIG_PPC64_ELF_ABI_V2) || (defined(CONFIG_PPC64) && defined(CONFIG_CPU_LITTLE_ENDIAN))
+#define LTTNG_CONFIG_PPC64_ELF_ABI_V2
+#endif
+#if defined(CONFIG_PPC64_ELF_ABI_V1) || (defined(CONFIG_PPC64) && defined(CONFIG_CPU_BIG_ENDIAN))
+#define LTTNG_CONFIG_PPC64_ELF_ABI_V1
+#endif
+
+/*
+ * PowerPC ABIv1 needs KALLSYMS_ALL to get the function descriptor,
+ * which is needed to perform the function call.
+ */
+#ifdef LTTNG_CONFIG_PPC64_ELF_ABI_V1
+# ifndef CONFIG_KALLSYMS_ALL
+#  error "LTTng-modules requires CONFIG_KALLSYMS_ALL on PowerPC ABIv1"
+# endif
+#endif
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0))
+
+unsigned long wrapper_kallsyms_lookup_name(const char *name);
+
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0)) */
+
+static inline
+unsigned long wrapper_kallsyms_lookup_name(const char *name)
+{
+       return kallsyms_lookup_name(name);
+}
+
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0)) */
 
 static inline
 unsigned long kallsyms_lookup_funcptr(const char *name)
 {
        unsigned long addr;
 
-       addr = kallsyms_lookup_name(name);
+       addr = wrapper_kallsyms_lookup_name(name);
 #ifdef CONFIG_ARM
 #ifdef CONFIG_THUMB2_KERNEL
        if (addr)
@@ -27,4 +62,11 @@ unsigned long kallsyms_lookup_funcptr(const char *name)
 #endif
        return addr;
 }
+
+static inline
+unsigned long kallsyms_lookup_dataptr(const char *name)
+{
+       return wrapper_kallsyms_lookup_name(name);
+}
+
 #endif /* _LTTNG_WRAPPER_KALLSYMS_H */