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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Generic arch dependent fprobe macros.
*/
#ifndef __ASM_GENERIC_FPROBE_H__
#define __ASM_GENERIC_FPROBE_H__
#include <linux/bits.h>
#ifdef CONFIG_64BIT
/*
* Encoding the size and the address of fprobe into one 64bit entry.
* The 32bit architectures should use 2 entries to store those info.
*/
#define ARCH_DEFINE_ENCODE_FPROBE_HEADER
#define FPROBE_HEADER_MSB_SIZE_SHIFT (BITS_PER_LONG - FPROBE_DATA_SIZE_BITS)
#define FPROBE_HEADER_MSB_MASK \
GENMASK(FPROBE_HEADER_MSB_SIZE_SHIFT - 1, 0)
/*
* By default, this expects the MSBs in the address of kprobe is 0xf.
* If any arch needs another fixed pattern (e.g. s390 is zero filled),
* override this.
*/
#define FPROBE_HEADER_MSB_PATTERN \
GENMASK(BITS_PER_LONG - 1, FPROBE_HEADER_MSB_SIZE_SHIFT)
#define arch_fprobe_header_encodable(fp) \
(((unsigned long)(fp) & ~FPROBE_HEADER_MSB_MASK) == \
FPROBE_HEADER_MSB_PATTERN)
#define arch_encode_fprobe_header(fp, size) \
(((unsigned long)(fp) & FPROBE_HEADER_MSB_MASK) | \
((unsigned long)(size) << FPROBE_HEADER_MSB_SIZE_SHIFT))
#define arch_decode_fprobe_header_size(val) \
((unsigned long)(val) >> FPROBE_HEADER_MSB_SIZE_SHIFT)
#define arch_decode_fprobe_header_fp(val) \
((struct fprobe *)(((unsigned long)(val) & FPROBE_HEADER_MSB_MASK) | \
FPROBE_HEADER_MSB_PATTERN))
#endif /* CONFIG_64BIT */
#endif /* __ASM_GENERIC_FPROBE_H__ */
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