projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
| 9f36eaed | 2 | * |
| 886d51a3 | 3 | * wrapper/kallsyms.h |
| cab3c961 AS |
4 | * |
| 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. | |
| 8 | * | |
| 886d51a3 MD |
9 | * Copyright (C) 2011 Avik Sil (avik.sil@linaro.org) |
| 10 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| cab3c961 AS |
11 | */ |
| 12 | ||
| 9f36eaed MJ |
13 | #ifndef _LTTNG_WRAPPER_KALLSYMS_H |
| 14 | #define _LTTNG_WRAPPER_KALLSYMS_H | |
| 15 | ||
| f6566a02 | 16 | #include <linux/kallsyms.h> |
| 5f4c791e | 17 | #include <lttng/kernel-version.h> |
| f6566a02 | 18 | |
| 47af6022 MJ |
19 | /* CONFIG_PPC64_ELF_ABI_V1/V2 were introduced in v5.19 */ |
| 20 | #if defined(CONFIG_PPC64_ELF_ABI_V2) || (defined(CONFIG_PPC64) && defined(CONFIG_CPU_LITTLE_ENDIAN)) | |
| 21 | #define LTTNG_CONFIG_PPC64_ELF_ABI_V2 | |
| 22 | #endif | |
| 23 | #if defined(CONFIG_PPC64_ELF_ABI_V1) || (defined(CONFIG_PPC64) && defined(CONFIG_CPU_BIG_ENDIAN)) | |
| 24 | #define LTTNG_CONFIG_PPC64_ELF_ABI_V1 | |
| 25 | #endif | |
| 26 | ||
| 43a2a0fa MD |
27 | /* |
| 28 | * PowerPC ABIv1 needs KALLSYMS_ALL to get the function descriptor, | |
| 29 | * which is needed to perform the function call. | |
| 30 | */ | |
| 47af6022 | 31 | #ifdef LTTNG_CONFIG_PPC64_ELF_ABI_V1 |
| 43a2a0fa MD |
32 | # ifndef CONFIG_KALLSYMS_ALL |
| 33 | # error "LTTng-modules requires CONFIG_KALLSYMS_ALL on PowerPC ABIv1" | |
| 34 | # endif | |
| 35 | #endif | |
| 36 | ||
| 5f4c791e | 37 | #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0)) |
| a6576540 MD |
38 | |
| 39 | unsigned long wrapper_kallsyms_lookup_name(const char *name); | |
| 40 | ||
| 5f4c791e | 41 | #else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0)) */ |
| a6576540 MD |
42 | |
| 43 | static inline | |
| 44 | unsigned long wrapper_kallsyms_lookup_name(const char *name) | |
| 45 | { | |
| 46 | return kallsyms_lookup_name(name); | |
| 47 | } | |
| 48 | ||
| 5f4c791e | 49 | #endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,7,0)) */ |
| a6576540 | 50 | |
| cab3c961 AS |
51 | static inline |
| 52 | unsigned long kallsyms_lookup_funcptr(const char *name) | |
| 53 | { | |
| 54 | unsigned long addr; | |
| 55 | ||
| a6576540 | 56 | addr = wrapper_kallsyms_lookup_name(name); |
| bb304164 | 57 | #if defined(CONFIG_ARM) && defined(CONFIG_THUMB2_KERNEL) |
| cab3c961 AS |
58 | if (addr) |
| 59 | addr |= 1; /* set bit 0 in address for thumb mode */ | |
| cab3c961 AS |
60 | #endif |
| 61 | return addr; | |
| 62 | } | |
| 42d9070d AG |
63 | |
| 64 | static inline | |
| 65 | unsigned long kallsyms_lookup_dataptr(const char *name) | |
| 66 | { | |
| a6576540 | 67 | return wrapper_kallsyms_lookup_name(name); |
| 42d9070d | 68 | } |
| a6576540 | 69 | |
| a90917c3 | 70 | #endif /* _LTTNG_WRAPPER_KALLSYMS_H */ |