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Depending on supported extensions on specific RISC-V cores, optimized str* functions might make sense. This adds basic infrastructure to allow patching the function calls via alternatives later on. The Linux kernel provides standard implementations for string functions but when architectures want to extend them, they need to provide their own. The added generic string functions are done in assembler (taken from disassembling the main-kernel functions for now) to allow us to control the used registers and extend them with optimized variants. This doesn't override the compiler's use of builtin replacements. So still first of all the compiler will select if a builtin will be better suitable i.e. for known strings. For all regular cases we will want to later select possible optimized variants and in the worst case fall back to the generic implemention added with this change. Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230113212301.3534711-2-heiko@sntech.de Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2013 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_STRING_H
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#define _ASM_RISCV_STRING_H
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#include <linux/types.h>
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#include <linux/linkage.h>
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#define __HAVE_ARCH_MEMSET
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extern asmlinkage void *memset(void *, int, size_t);
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extern asmlinkage void *__memset(void *, int, size_t);
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#define __HAVE_ARCH_MEMCPY
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extern asmlinkage void *memcpy(void *, const void *, size_t);
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extern asmlinkage void *__memcpy(void *, const void *, size_t);
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#define __HAVE_ARCH_MEMMOVE
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extern asmlinkage void *memmove(void *, const void *, size_t);
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extern asmlinkage void *__memmove(void *, const void *, size_t);
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#define __HAVE_ARCH_STRCMP
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extern asmlinkage int strcmp(const char *cs, const char *ct);
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#define __HAVE_ARCH_STRLEN
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extern asmlinkage __kernel_size_t strlen(const char *);
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#define __HAVE_ARCH_STRNCMP
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extern asmlinkage int strncmp(const char *cs, const char *ct, size_t count);
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/* For those files which don't want to check by kasan. */
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#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
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#define memcpy(dst, src, len) __memcpy(dst, src, len)
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#define memset(s, c, n) __memset(s, c, n)
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#define memmove(dst, src, len) __memmove(dst, src, len)
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#ifndef __NO_FORTIFY
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#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
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#endif
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#endif
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#endif /* _ASM_RISCV_STRING_H */
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