forked from mirrors/linux
8aa8eb2a8f
Change objtool to support intra-function calls. On x86, an intra-function call is represented in objtool as a push onto the stack (of the return address), and a jump to the destination address. That way the stack information is correctly updated and the call flow is still accurate. Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20200414103618.12657-4-alexandre.chartre@oracle.com
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_FRAME_H
|
|
#define _LINUX_FRAME_H
|
|
|
|
#ifdef CONFIG_STACK_VALIDATION
|
|
/*
|
|
* This macro marks the given function's stack frame as "non-standard", which
|
|
* tells objtool to ignore the function when doing stack metadata validation.
|
|
* It should only be used in special cases where you're 100% sure it won't
|
|
* affect the reliability of frame pointers and kernel stack traces.
|
|
*
|
|
* For more information, see tools/objtool/Documentation/stack-validation.txt.
|
|
*/
|
|
#define STACK_FRAME_NON_STANDARD(func) \
|
|
static void __used __section(.discard.func_stack_frame_non_standard) \
|
|
*__func_stack_frame_non_standard_##func = func
|
|
|
|
/*
|
|
* This macro indicates that the following intra-function call is valid.
|
|
* Any non-annotated intra-function call will cause objtool to issue a warning.
|
|
*/
|
|
#define ANNOTATE_INTRA_FUNCTION_CALL \
|
|
999: \
|
|
.pushsection .discard.intra_function_calls; \
|
|
.long 999b; \
|
|
.popsection;
|
|
|
|
#else /* !CONFIG_STACK_VALIDATION */
|
|
|
|
#define STACK_FRAME_NON_STANDARD(func)
|
|
#define ANNOTATE_INTRA_FUNCTION_CALL
|
|
|
|
#endif /* CONFIG_STACK_VALIDATION */
|
|
|
|
#endif /* _LINUX_FRAME_H */
|