1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
5 * wrapper around kallsyms_lookup_name. Implements arch-dependent code for
6 * arches where the address of the start of the function body is different
7 * from the pointer which can be used to call the function, e.g. ARM THUMB2.
9 * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org)
10 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
13 #ifndef _LTTNG_WRAPPER_KALLSYMS_H
14 #define _LTTNG_WRAPPER_KALLSYMS_H
16 #include <linux/kallsyms.h>
17 #include <linux/version.h>
20 * PowerPC ABIv1 needs KALLSYMS_ALL to get the function descriptor,
21 * which is needed to perform the function call.
23 #if defined(CONFIG_PPC64) && (!defined(_CALL_ELF) || _CALL_ELF < 2)
24 # ifndef CONFIG_KALLSYMS_ALL
25 # error "LTTng-modules requires CONFIG_KALLSYMS_ALL on PowerPC ABIv1"
29 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
31 unsigned long wrapper_kallsyms_lookup_name(const char *name
);
33 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
36 unsigned long wrapper_kallsyms_lookup_name(const char *name
)
38 return kallsyms_lookup_name(name
);
41 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
44 unsigned long kallsyms_lookup_funcptr(const char *name
)
48 addr
= wrapper_kallsyms_lookup_name(name
);
50 #ifdef CONFIG_THUMB2_KERNEL
52 addr
|= 1; /* set bit 0 in address for thumb mode */
59 unsigned long kallsyms_lookup_dataptr(const char *name
)
61 return wrapper_kallsyms_lookup_name(name
);
64 #endif /* _LTTNG_WRAPPER_KALLSYMS_H */
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