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https://github.com/torvalds/linux.git
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0cd1151886
Remove the csky implemenation of strncpy/strnlen and instead use the generic versions. The csky version is fairly slow because it always does byte accesses even for aligned data, and it lacks a checks for user_addr_max(). Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
214 lines
6.9 KiB
C
214 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/uaccess.h>
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#include <linux/types.h>
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unsigned long raw_copy_from_user(void *to, const void *from,
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unsigned long n)
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{
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int tmp, nsave;
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__asm__ __volatile__(
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"0: cmpnei %1, 0 \n"
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" bf 7f \n"
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" mov %3, %1 \n"
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" or %3, %2 \n"
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" andi %3, 3 \n"
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" cmpnei %3, 0 \n"
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" bf 1f \n"
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" br 5f \n"
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"1: cmplti %0, 16 \n"
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" bt 3f \n"
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"2: ldw %3, (%2, 0) \n"
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"10: ldw %4, (%2, 4) \n"
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" stw %3, (%1, 0) \n"
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" stw %4, (%1, 4) \n"
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"11: ldw %3, (%2, 8) \n"
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"12: ldw %4, (%2, 12) \n"
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" stw %3, (%1, 8) \n"
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" stw %4, (%1, 12) \n"
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" addi %2, 16 \n"
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" addi %1, 16 \n"
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" subi %0, 16 \n"
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" br 1b \n"
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"3: cmplti %0, 4 \n"
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" bt 5f \n"
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"4: ldw %3, (%2, 0) \n"
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" stw %3, (%1, 0) \n"
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" addi %2, 4 \n"
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" addi %1, 4 \n"
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" subi %0, 4 \n"
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" br 3b \n"
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"5: cmpnei %0, 0 \n"
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" bf 7f \n"
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"6: ldb %3, (%2, 0) \n"
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" stb %3, (%1, 0) \n"
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" addi %2, 1 \n"
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" addi %1, 1 \n"
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" subi %0, 1 \n"
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" br 5b \n"
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"8: stw %3, (%1, 0) \n"
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" subi %0, 4 \n"
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" bf 7f \n"
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"9: subi %0, 8 \n"
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" bf 7f \n"
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"13: stw %3, (%1, 8) \n"
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" subi %0, 12 \n"
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" bf 7f \n"
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".section __ex_table, \"a\" \n"
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".align 2 \n"
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".long 2b, 7f \n"
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".long 4b, 7f \n"
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".long 6b, 7f \n"
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".long 10b, 8b \n"
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".long 11b, 9b \n"
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".long 12b,13b \n"
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".previous \n"
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"7: \n"
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: "=r"(n), "=r"(to), "=r"(from), "=r"(nsave),
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"=r"(tmp)
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: "0"(n), "1"(to), "2"(from)
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: "memory");
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return n;
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}
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EXPORT_SYMBOL(raw_copy_from_user);
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unsigned long raw_copy_to_user(void *to, const void *from,
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unsigned long n)
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{
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int w0, w1, w2, w3;
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__asm__ __volatile__(
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"0: cmpnei %1, 0 \n"
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" bf 8f \n"
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" mov %3, %1 \n"
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" or %3, %2 \n"
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" andi %3, 3 \n"
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" cmpnei %3, 0 \n"
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" bf 1f \n"
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" br 5f \n"
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"1: cmplti %0, 16 \n" /* 4W */
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" bt 3f \n"
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" ldw %3, (%2, 0) \n"
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" ldw %4, (%2, 4) \n"
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" ldw %5, (%2, 8) \n"
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" ldw %6, (%2, 12) \n"
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"2: stw %3, (%1, 0) \n"
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"9: stw %4, (%1, 4) \n"
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"10: stw %5, (%1, 8) \n"
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"11: stw %6, (%1, 12) \n"
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" addi %2, 16 \n"
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" addi %1, 16 \n"
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" subi %0, 16 \n"
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" br 1b \n"
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"3: cmplti %0, 4 \n" /* 1W */
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" bt 5f \n"
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" ldw %3, (%2, 0) \n"
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"4: stw %3, (%1, 0) \n"
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" addi %2, 4 \n"
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" addi %1, 4 \n"
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" subi %0, 4 \n"
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" br 3b \n"
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"5: cmpnei %0, 0 \n" /* 1B */
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" bf 13f \n"
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" ldb %3, (%2, 0) \n"
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"6: stb %3, (%1, 0) \n"
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" addi %2, 1 \n"
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" addi %1, 1 \n"
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" subi %0, 1 \n"
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" br 5b \n"
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"7: subi %0, 4 \n"
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"8: subi %0, 4 \n"
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"12: subi %0, 4 \n"
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" br 13f \n"
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".section __ex_table, \"a\" \n"
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".align 2 \n"
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".long 2b, 13f \n"
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".long 4b, 13f \n"
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".long 6b, 13f \n"
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".long 9b, 12b \n"
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".long 10b, 8b \n"
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".long 11b, 7b \n"
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".previous \n"
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"13: \n"
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: "=r"(n), "=r"(to), "=r"(from), "=r"(w0),
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"=r"(w1), "=r"(w2), "=r"(w3)
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: "0"(n), "1"(to), "2"(from)
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: "memory");
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return n;
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}
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EXPORT_SYMBOL(raw_copy_to_user);
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/*
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* __clear_user: - Zero a block of memory in user space, with less checking.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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unsigned long
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__clear_user(void __user *to, unsigned long n)
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{
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int data, value, tmp;
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__asm__ __volatile__(
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"0: cmpnei %1, 0 \n"
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" bf 7f \n"
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" mov %3, %1 \n"
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" andi %3, 3 \n"
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" cmpnei %3, 0 \n"
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" bf 1f \n"
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" br 5f \n"
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"1: cmplti %0, 32 \n" /* 4W */
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" bt 3f \n"
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"8: stw %2, (%1, 0) \n"
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"10: stw %2, (%1, 4) \n"
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"11: stw %2, (%1, 8) \n"
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"12: stw %2, (%1, 12) \n"
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"13: stw %2, (%1, 16) \n"
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"14: stw %2, (%1, 20) \n"
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"15: stw %2, (%1, 24) \n"
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"16: stw %2, (%1, 28) \n"
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" addi %1, 32 \n"
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" subi %0, 32 \n"
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" br 1b \n"
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"3: cmplti %0, 4 \n" /* 1W */
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" bt 5f \n"
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"4: stw %2, (%1, 0) \n"
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" addi %1, 4 \n"
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" subi %0, 4 \n"
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" br 3b \n"
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"5: cmpnei %0, 0 \n" /* 1B */
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"9: bf 7f \n"
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"6: stb %2, (%1, 0) \n"
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" addi %1, 1 \n"
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" subi %0, 1 \n"
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" br 5b \n"
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".section __ex_table,\"a\" \n"
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".align 2 \n"
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".long 8b, 9b \n"
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".long 10b, 9b \n"
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".long 11b, 9b \n"
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".long 12b, 9b \n"
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".long 13b, 9b \n"
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".long 14b, 9b \n"
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".long 15b, 9b \n"
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".long 16b, 9b \n"
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".long 4b, 9b \n"
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".long 6b, 9b \n"
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".previous \n"
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"7: \n"
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: "=r"(n), "=r" (data), "=r"(value), "=r"(tmp)
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: "0"(n), "1"(to), "2"(0)
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: "memory");
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return n;
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}
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EXPORT_SYMBOL(__clear_user);
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