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a4f87dea2d
Provide a __copy_from_user that uses memcpy. On BCM2708, use optimised memcpy/memmove/memcmp/memset implementations. arch/arm: Add mmiocpy/set aliases for memcpy/set See: https://github.com/raspberrypi/linux/issues/1082 copy_from_user: CPU_SW_DOMAIN_PAN compatibility The downstream copy_from_user acceleration must also play nice with CONFIG_CPU_SW_DOMAIN_PAN. See: https://github.com/raspberrypi/linux/issues/1381 Signed-off-by: Phil Elwell <phil@raspberrypi.org> Fix copy_from_user if BCM2835_FAST_MEMCPY=n The change which introduced CONFIG_BCM2835_FAST_MEMCPY unconditionally changed the behaviour of arm_copy_from_user. The page pinning code is not safe on ARMv7 if LPAE & high memory is enabled and causes crashes which look like PTE corruption. Make __copy_from_user_memcpy conditional on CONFIG_2835_FAST_MEMCPY=y which is really an ARMv6 / Pi1 optimization and not necessary on newer ARM processors. arm: fix mmap unlocks in uaccess_with_memcpy.c This is a regression that was added with the commit192a4e923eas of rpi-5.8.y, since that is when the move to the mmap locking API was introduced -d8ed45c5dcThe issue is that when the patch to improve performance for the __copy_to_user and __copy_from_user functions were added for the Raspberry Pi, some of the mmaps were incorrectly mapped to write instead of read. This would cause a verity of issues, and in my case, prevent the booting of a squashfs filesystem on rpi-5.8-y and above. An example of the panic you would see from this can be seen at https://pastebin.com/raw/jBz5xCzL Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Christopher Blake <chrisrblake93@gmail.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ARM_STRING_H
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#define __ASM_ARM_STRING_H
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/*
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* We don't do inline string functions, since the
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* optimised inline asm versions are not small.
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*/
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#define __HAVE_ARCH_STRRCHR
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extern char * strrchr(const char * s, int c);
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#define __HAVE_ARCH_STRCHR
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extern char * strchr(const char * s, int c);
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#define __HAVE_ARCH_MEMCPY
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extern void * memcpy(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMMOVE
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extern void * memmove(void *, const void *, __kernel_size_t);
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#define __HAVE_ARCH_MEMCHR
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extern void * memchr(const void *, int, __kernel_size_t);
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#define __HAVE_ARCH_MEMSET
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extern void * memset(void *, int, __kernel_size_t);
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#define __HAVE_ARCH_MEMSET32
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extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
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static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
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{
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return __memset32(p, v, n * 4);
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}
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#define __HAVE_ARCH_MEMSET64
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extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
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static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
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{
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return __memset64(p, v, n * 8, v >> 32);
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}
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#ifdef CONFIG_BCM2835_FAST_MEMCPY
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#define __HAVE_ARCH_MEMCMP
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extern int memcmp(const void *, const void *, size_t);
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#endif
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#endif
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