Commit | Line | Data |
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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); |
cab3c961 AS |
57 | #ifdef CONFIG_ARM |
58 | #ifdef CONFIG_THUMB2_KERNEL | |
59 | if (addr) | |
60 | addr |= 1; /* set bit 0 in address for thumb mode */ | |
61 | #endif | |
62 | #endif | |
63 | return addr; | |
64 | } | |
42d9070d AG |
65 | |
66 | static inline | |
67 | unsigned long kallsyms_lookup_dataptr(const char *name) | |
68 | { | |
a6576540 | 69 | return wrapper_kallsyms_lookup_name(name); |
42d9070d | 70 | } |
a6576540 | 71 | |
a90917c3 | 72 | #endif /* _LTTNG_WRAPPER_KALLSYMS_H */ |