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