1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Generic arch dependent fprobe macros. 4 */ 5 #ifndef __ASM_GENERIC_FPROBE_H__ 6 #define __ASM_GENERIC_FPROBE_H__ 7 8 #include <linux/bits.h> 9 10 #ifdef CONFIG_64BIT 11 /* 12 * Encoding the size and the address of fprobe into one 64bit entry. 13 * The 32bit architectures should use 2 entries to store those info. 14 */ 15 16 #define ARCH_DEFINE_ENCODE_FPROBE_HEADER 17 18 #define FPROBE_HEADER_MSB_SIZE_SHIFT (BITS_PER_LONG - FPROBE_DATA_SIZE_BITS) 19 #define FPROBE_HEADER_MSB_MASK \ 20 GENMASK(FPROBE_HEADER_MSB_SIZE_SHIFT - 1, 0) 21 22 /* 23 * By default, this expects the MSBs in the address of kprobe is 0xf. 24 * If any arch needs another fixed pattern (e.g. s390 is zero filled), 25 * override this. 26 */ 27 #define FPROBE_HEADER_MSB_PATTERN \ 28 GENMASK(BITS_PER_LONG - 1, FPROBE_HEADER_MSB_SIZE_SHIFT) 29 30 #define arch_fprobe_header_encodable(fp) \ 31 (((unsigned long)(fp) & ~FPROBE_HEADER_MSB_MASK) == \ 32 FPROBE_HEADER_MSB_PATTERN) 33 34 #define arch_encode_fprobe_header(fp, size) \ 35 (((unsigned long)(fp) & FPROBE_HEADER_MSB_MASK) | \ 36 ((unsigned long)(size) << FPROBE_HEADER_MSB_SIZE_SHIFT)) 37 38 #define arch_decode_fprobe_header_size(val) \ 39 ((unsigned long)(val) >> FPROBE_HEADER_MSB_SIZE_SHIFT) 40 41 #define arch_decode_fprobe_header_fp(val) \ 42 ((struct fprobe *)(((unsigned long)(val) & FPROBE_HEADER_MSB_MASK) | \ 43 FPROBE_HEADER_MSB_PATTERN)) 44 #endif /* CONFIG_64BIT */ 45 46 #endif /* __ASM_GENERIC_FPROBE_H__ */ 47