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/* 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 <lttng/kernel-version.h>
#include <wrapper/ibt.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 = wrapper_kallsyms_lookup_name(name);
#if defined(CONFIG_ARM) && defined(CONFIG_THUMB2_KERNEL)
if (addr)
addr |= 1; /* set bit 0 in address for thumb mode */
#endif
return addr;
}
static inline
unsigned long kallsyms_lookup_dataptr(const char *name)
{
return wrapper_kallsyms_lookup_name(name);
}
#endif /* _LTTNG_WRAPPER_KALLSYMS_H */
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