| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| |
| #include <linux/uaccess.h> |
| #include <linux/types.h> |
| |
| unsigned long raw_copy_from_user(void *to, const void *from, |
| unsigned long n) |
| { |
| int tmp, nsave; |
| |
| __asm__ __volatile__( |
| "0: cmpnei %1, 0 \n" |
| " bf 7f \n" |
| " mov %3, %1 \n" |
| " or %3, %2 \n" |
| " andi %3, 3 \n" |
| " cmpnei %3, 0 \n" |
| " bf 1f \n" |
| " br 5f \n" |
| "1: cmplti %0, 16 \n" |
| " bt 3f \n" |
| "2: ldw %3, (%2, 0) \n" |
| "10: ldw %4, (%2, 4) \n" |
| " stw %3, (%1, 0) \n" |
| " stw %4, (%1, 4) \n" |
| "11: ldw %3, (%2, 8) \n" |
| "12: ldw %4, (%2, 12) \n" |
| " stw %3, (%1, 8) \n" |
| " stw %4, (%1, 12) \n" |
| " addi %2, 16 \n" |
| " addi %1, 16 \n" |
| " subi %0, 16 \n" |
| " br 1b \n" |
| "3: cmplti %0, 4 \n" |
| " bt 5f \n" |
| "4: ldw %3, (%2, 0) \n" |
| " stw %3, (%1, 0) \n" |
| " addi %2, 4 \n" |
| " addi %1, 4 \n" |
| " subi %0, 4 \n" |
| " br 3b \n" |
| "5: cmpnei %0, 0 \n" |
| " bf 7f \n" |
| "6: ldb %3, (%2, 0) \n" |
| " stb %3, (%1, 0) \n" |
| " addi %2, 1 \n" |
| " addi %1, 1 \n" |
| " subi %0, 1 \n" |
| " br 5b \n" |
| "8: stw %3, (%1, 0) \n" |
| " subi %0, 4 \n" |
| " bf 7f \n" |
| "9: subi %0, 8 \n" |
| " bf 7f \n" |
| "13: stw %3, (%1, 8) \n" |
| " subi %0, 12 \n" |
| " bf 7f \n" |
| ".section __ex_table, \"a\" \n" |
| ".align 2 \n" |
| ".long 2b, 7f \n" |
| ".long 4b, 7f \n" |
| ".long 6b, 7f \n" |
| ".long 10b, 8b \n" |
| ".long 11b, 9b \n" |
| ".long 12b,13b \n" |
| ".previous \n" |
| "7: \n" |
| : "=r"(n), "=r"(to), "=r"(from), "=r"(nsave), |
| "=r"(tmp) |
| : "0"(n), "1"(to), "2"(from) |
| : "memory"); |
| |
| return n; |
| } |
| EXPORT_SYMBOL(raw_copy_from_user); |
| |
| unsigned long raw_copy_to_user(void *to, const void *from, |
| unsigned long n) |
| { |
| int w0, w1, w2, w3; |
| |
| __asm__ __volatile__( |
| "0: cmpnei %1, 0 \n" |
| " bf 8f \n" |
| " mov %3, %1 \n" |
| " or %3, %2 \n" |
| " andi %3, 3 \n" |
| " cmpnei %3, 0 \n" |
| " bf 1f \n" |
| " br 5f \n" |
| "1: cmplti %0, 16 \n" /* 4W */ |
| " bt 3f \n" |
| " ldw %3, (%2, 0) \n" |
| " ldw %4, (%2, 4) \n" |
| " ldw %5, (%2, 8) \n" |
| " ldw %6, (%2, 12) \n" |
| "2: stw %3, (%1, 0) \n" |
| "9: stw %4, (%1, 4) \n" |
| "10: stw %5, (%1, 8) \n" |
| "11: stw %6, (%1, 12) \n" |
| " addi %2, 16 \n" |
| " addi %1, 16 \n" |
| " subi %0, 16 \n" |
| " br 1b \n" |
| "3: cmplti %0, 4 \n" /* 1W */ |
| " bt 5f \n" |
| " ldw %3, (%2, 0) \n" |
| "4: stw %3, (%1, 0) \n" |
| " addi %2, 4 \n" |
| " addi %1, 4 \n" |
| " subi %0, 4 \n" |
| " br 3b \n" |
| "5: cmpnei %0, 0 \n" /* 1B */ |
| " bf 13f \n" |
| " ldb %3, (%2, 0) \n" |
| "6: stb %3, (%1, 0) \n" |
| " addi %2, 1 \n" |
| " addi %1, 1 \n" |
| " subi %0, 1 \n" |
| " br 5b \n" |
| "7: subi %0, 4 \n" |
| "8: subi %0, 4 \n" |
| "12: subi %0, 4 \n" |
| " br 13f \n" |
| ".section __ex_table, \"a\" \n" |
| ".align 2 \n" |
| ".long 2b, 13f \n" |
| ".long 4b, 13f \n" |
| ".long 6b, 13f \n" |
| ".long 9b, 12b \n" |
| ".long 10b, 8b \n" |
| ".long 11b, 7b \n" |
| ".previous \n" |
| "13: \n" |
| : "=r"(n), "=r"(to), "=r"(from), "=r"(w0), |
| "=r"(w1), "=r"(w2), "=r"(w3) |
| : "0"(n), "1"(to), "2"(from) |
| : "memory"); |
| |
| return n; |
| } |
| EXPORT_SYMBOL(raw_copy_to_user); |
| |
| /* |
| * __strncpy_from_user: - Copy a NUL terminated string from userspace, |
| * with less checking. |
| * @dst: Destination address, in kernel space. This buffer must be at |
| * least @count bytes long. |
| * @src: Source address, in user space. |
| * @count: Maximum number of bytes to copy, including the trailing NUL. |
| * |
| * Copies a NUL-terminated string from userspace to kernel space. |
| * Caller must check the specified block with access_ok() before calling |
| * this function. |
| * |
| * On success, returns the length of the string (not including the trailing |
| * NUL). |
| * |
| * If access to userspace fails, returns -EFAULT (some data may have been |
| * copied). |
| * |
| * If @count is smaller than the length of the string, copies @count bytes |
| * and returns @count. |
| */ |
| long __strncpy_from_user(char *dst, const char *src, long count) |
| { |
| long res, faultres; |
| int tmp; |
| |
| __asm__ __volatile__( |
| " cmpnei %3, 0 \n" |
| " bf 4f \n" |
| "1: cmpnei %1, 0 \n" |
| " bf 5f \n" |
| "2: ldb %4, (%3, 0) \n" |
| " stb %4, (%2, 0) \n" |
| " cmpnei %4, 0 \n" |
| " bf 3f \n" |
| " addi %3, 1 \n" |
| " addi %2, 1 \n" |
| " subi %1, 1 \n" |
| " br 1b \n" |
| "3: subu %0, %1 \n" |
| " br 5f \n" |
| "4: mov %0, %5 \n" |
| " br 5f \n" |
| ".section __ex_table, \"a\" \n" |
| ".align 2 \n" |
| ".long 2b, 4b \n" |
| ".previous \n" |
| "5: \n" |
| : "=r"(res), "=r"(count), "=r"(dst), |
| "=r"(src), "=r"(tmp), "=r"(faultres) |
| : "5"(-EFAULT), "0"(count), "1"(count), |
| "2"(dst), "3"(src) |
| : "memory"); |
| |
| return res; |
| } |
| EXPORT_SYMBOL(__strncpy_from_user); |
| |
| /* |
| * strnlen_user: - Get the size of a string in user space. |
| * @str: The string to measure. |
| * @n: The maximum valid length |
| * |
| * Get the size of a NUL-terminated string in user space. |
| * |
| * Returns the size of the string INCLUDING the terminating NUL. |
| * On exception, returns 0. |
| * If the string is too long, returns a value greater than @n. |
| */ |
| long __strnlen_user(const char *s, long n) |
| { |
| unsigned long res, tmp; |
| |
| __asm__ __volatile__( |
| " cmpnei %1, 0 \n" |
| " bf 3f \n" |
| "1: cmpnei %0, 0 \n" |
| " bf 3f \n" |
| "2: ldb %3, (%1, 0) \n" |
| " cmpnei %3, 0 \n" |
| " bf 3f \n" |
| " subi %0, 1 \n" |
| " addi %1, 1 \n" |
| " br 1b \n" |
| "3: subu %2, %0 \n" |
| " addi %2, 1 \n" |
| " br 5f \n" |
| "4: movi %0, 0 \n" |
| " br 5f \n" |
| ".section __ex_table, \"a\" \n" |
| ".align 2 \n" |
| ".long 2b, 4b \n" |
| ".previous \n" |
| "5: \n" |
| : "=r"(n), "=r"(s), "=r"(res), "=r"(tmp) |
| : "0"(n), "1"(s), "2"(n) |
| : "memory"); |
| |
| return res; |
| } |
| EXPORT_SYMBOL(__strnlen_user); |
| |
| /* |
| * __clear_user: - Zero a block of memory in user space, with less checking. |
| * @to: Destination address, in user space. |
| * @n: Number of bytes to zero. |
| * |
| * Zero a block of memory in user space. Caller must check |
| * the specified block with access_ok() before calling this function. |
| * |
| * Returns number of bytes that could not be cleared. |
| * On success, this will be zero. |
| */ |
| unsigned long |
| __clear_user(void __user *to, unsigned long n) |
| { |
| int data, value, tmp; |
| |
| __asm__ __volatile__( |
| "0: cmpnei %1, 0 \n" |
| " bf 7f \n" |
| " mov %3, %1 \n" |
| " andi %3, 3 \n" |
| " cmpnei %3, 0 \n" |
| " bf 1f \n" |
| " br 5f \n" |
| "1: cmplti %0, 32 \n" /* 4W */ |
| " bt 3f \n" |
| "8: stw %2, (%1, 0) \n" |
| "10: stw %2, (%1, 4) \n" |
| "11: stw %2, (%1, 8) \n" |
| "12: stw %2, (%1, 12) \n" |
| "13: stw %2, (%1, 16) \n" |
| "14: stw %2, (%1, 20) \n" |
| "15: stw %2, (%1, 24) \n" |
| "16: stw %2, (%1, 28) \n" |
| " addi %1, 32 \n" |
| " subi %0, 32 \n" |
| " br 1b \n" |
| "3: cmplti %0, 4 \n" /* 1W */ |
| " bt 5f \n" |
| "4: stw %2, (%1, 0) \n" |
| " addi %1, 4 \n" |
| " subi %0, 4 \n" |
| " br 3b \n" |
| "5: cmpnei %0, 0 \n" /* 1B */ |
| "9: bf 7f \n" |
| "6: stb %2, (%1, 0) \n" |
| " addi %1, 1 \n" |
| " subi %0, 1 \n" |
| " br 5b \n" |
| ".section __ex_table,\"a\" \n" |
| ".align 2 \n" |
| ".long 8b, 9b \n" |
| ".long 10b, 9b \n" |
| ".long 11b, 9b \n" |
| ".long 12b, 9b \n" |
| ".long 13b, 9b \n" |
| ".long 14b, 9b \n" |
| ".long 15b, 9b \n" |
| ".long 16b, 9b \n" |
| ".long 4b, 9b \n" |
| ".long 6b, 9b \n" |
| ".previous \n" |
| "7: \n" |
| : "=r"(n), "=r" (data), "=r"(value), "=r"(tmp) |
| : "0"(n), "1"(to), "2"(0) |
| : "memory"); |
| |
| return n; |
| } |
| EXPORT_SYMBOL(__clear_user); |
