Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_FRAME_H
3#define _LINUX_FRAME_H
4
5#ifdef CONFIG_STACK_VALIDATION
6/*
7 * This macro marks the given function's stack frame as "non-standard", which
8 * tells objtool to ignore the function when doing stack metadata validation.
9 * It should only be used in special cases where you're 100% sure it won't
10 * affect the reliability of frame pointers and kernel stack traces.
11 *
12 * For more information, see tools/objtool/Documentation/stack-validation.txt.
13 */
14#define STACK_FRAME_NON_STANDARD(func) \
15 static void __used __section(.discard.func_stack_frame_non_standard) \
16 *__func_stack_frame_non_standard_##func = func
17
18/*
19 * This macro indicates that the following intra-function call is valid.
20 * Any non-annotated intra-function call will cause objtool to issue a warning.
21 */
22#define ANNOTATE_INTRA_FUNCTION_CALL \
23 999: \
24 .pushsection .discard.intra_function_calls; \
25 .long 999b; \
26 .popsection;
27
28#else /* !CONFIG_STACK_VALIDATION */
29
30#define STACK_FRAME_NON_STANDARD(func)
31#define ANNOTATE_INTRA_FUNCTION_CALL
32
33#endif /* CONFIG_STACK_VALIDATION */
34
35#endif /* _LINUX_FRAME_H */