cda689f870
Just 1 feature and 3 fixups. -----BEGIN PGP SIGNATURE----- iQJGBAABCgAwFiEE2KAv+isbWR/viAKHAXH1GYaIxXsFAmCQHXUSHGd1b3JlbkBr ZXJuZWwub3JnAAoJEAFx9RmGiMV7QbEP/A5noQq5vO5DcIywFpyjw1Ca+kS8WVKq 67cQMn+vlaD4RAllWkjPnatg0OkLqvpsp8pJytM4RmmCOuoaMtKQGXiCU01u1t3V 3CZifEBTg0ZzlliSjsEzaA8RvleLURlkHEcswVILklMESajvqkpHsnTSbkoctrrr cD1A1Dwyas5oSrj5Qfdsz52u0jmeY+gmtK8NMQr3rbKBAHdu+D1NpeADnrD1uWs6 Fcw7qZZ5AmOffQ73JgqPiJ0YWpiP6GBn7pTst8PHrBrG8CR3XYUV+OdbPkiTvznb GNYUJ7tum9b7JNEHW7w2EQO0Pz96bbSczddZPrNV06HtC67hKqjsPS2WTDCGF/f7 wzSgaUyKoHA/F1FVbPJbP7NeGDsqAfwHdnkgR86MKYfP4jE6+zECFvbfxKrmw8Ob 5Owp9TF3vS7hO5wJA550e79xKdw2fVuvJ5k+ZoKpgQYifRexxIRfXNLANxfCv1sx 6hYt/NZWsRJSGcZ4cr1BQvp+pQq/zjsP9Z4x+2aKORG9tz2uSaf2T7XkQDkoJxln SxvDDYWDRi2khzZ4IGTiavTNC4C3WsBKvfKBYCGYKG1AH8uQQt+cK1+wBQaERmgG 9AK4mkOWtlw6GPl+rKzum/15toCFZywU0idx19t/2pxWxTTmzAly/Z4xCQant6YY PZGmQYwAKKVV =jXN4 -----END PGP SIGNATURE----- Merge tag 'csky-for-linus-5.13-rc1' of git://github.com/c-sky/csky-linux Pull arch/csky updates from Guo Ren: "Just cleanups" * tag 'csky-for-linus-5.13-rc1' of git://github.com/c-sky/csky-linux: csky: uaccess.h: Coding convention with asm generic csky: fix syscache.c fallthrough warning csky: Fixup typos csky: Remove duplicate include in arch/csky/kernel/entry.S
317 lines
10 KiB
C
317 lines
10 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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* __strncpy_from_user: - Copy a NUL terminated string from userspace,
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* with less checking.
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* @dst: Destination address, in kernel space. This buffer must be at
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* least @count bytes long.
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* @src: Source address, in user space.
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* @count: Maximum number of bytes to copy, including the trailing NUL.
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*
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* Copies a NUL-terminated string from userspace to kernel space.
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* Caller must check the specified block with access_ok() before calling
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* this function.
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*
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* On success, returns the length of the string (not including the trailing
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* NUL).
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*
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* If access to userspace fails, returns -EFAULT (some data may have been
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* copied).
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*
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* If @count is smaller than the length of the string, copies @count bytes
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* and returns @count.
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*/
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long __strncpy_from_user(char *dst, const char *src, long count)
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{
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long res, faultres;
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int tmp;
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__asm__ __volatile__(
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" cmpnei %3, 0 \n"
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" bf 4f \n"
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"1: cmpnei %1, 0 \n"
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" bf 5f \n"
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"2: ldb %4, (%3, 0) \n"
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" stb %4, (%2, 0) \n"
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" cmpnei %4, 0 \n"
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" bf 3f \n"
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" addi %3, 1 \n"
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" addi %2, 1 \n"
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" subi %1, 1 \n"
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" br 1b \n"
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"3: subu %0, %1 \n"
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" br 5f \n"
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"4: mov %0, %5 \n"
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" br 5f \n"
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".section __ex_table, \"a\" \n"
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".align 2 \n"
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".long 2b, 4b \n"
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".previous \n"
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"5: \n"
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: "=r"(res), "=r"(count), "=r"(dst),
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"=r"(src), "=r"(tmp), "=r"(faultres)
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: "5"(-EFAULT), "0"(count), "1"(count),
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"2"(dst), "3"(src)
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: "memory");
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return res;
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}
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EXPORT_SYMBOL(__strncpy_from_user);
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/*
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* strnlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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* @n: The maximum valid length
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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* If the string is too long, returns a value greater than @n.
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*/
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long __strnlen_user(const char *s, long n)
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{
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unsigned long res, tmp;
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__asm__ __volatile__(
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" cmpnei %1, 0 \n"
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" bf 3f \n"
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"1: cmpnei %0, 0 \n"
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" bf 3f \n"
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"2: ldb %3, (%1, 0) \n"
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" cmpnei %3, 0 \n"
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" bf 3f \n"
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" subi %0, 1 \n"
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" addi %1, 1 \n"
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" br 1b \n"
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"3: subu %2, %0 \n"
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" addi %2, 1 \n"
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" br 5f \n"
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"4: movi %0, 0 \n"
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" br 5f \n"
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".section __ex_table, \"a\" \n"
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".align 2 \n"
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".long 2b, 4b \n"
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".previous \n"
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"5: \n"
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: "=r"(n), "=r"(s), "=r"(res), "=r"(tmp)
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: "0"(n), "1"(s), "2"(n)
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: "memory");
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return res;
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}
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EXPORT_SYMBOL(__strnlen_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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