| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 2009, Wind River Systems Inc |
| * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/uaccess.h> |
| |
| asm(".global __copy_from_user\n" |
| " .type __copy_from_user, @function\n" |
| "__copy_from_user:\n" |
| " movi r2,7\n" |
| " mov r3,r4\n" |
| " bge r2,r6,1f\n" |
| " xor r2,r4,r5\n" |
| " andi r2,r2,3\n" |
| " movi r7,3\n" |
| " beq r2,zero,4f\n" |
| "1: addi r6,r6,-1\n" |
| " movi r2,-1\n" |
| " beq r6,r2,3f\n" |
| " mov r7,r2\n" |
| "2: ldbu r2,0(r5)\n" |
| " addi r6,r6,-1\n" |
| " addi r5,r5,1\n" |
| " stb r2,0(r3)\n" |
| " addi r3,r3,1\n" |
| " bne r6,r7,2b\n" |
| "3:\n" |
| " addi r2,r6,1\n" |
| " ret\n" |
| "13:mov r2,r6\n" |
| " ret\n" |
| "4: andi r2,r4,1\n" |
| " cmpeq r2,r2,zero\n" |
| " beq r2,zero,7f\n" |
| "5: andi r2,r3,2\n" |
| " beq r2,zero,6f\n" |
| "9: ldhu r2,0(r5)\n" |
| " addi r6,r6,-2\n" |
| " addi r5,r5,2\n" |
| " sth r2,0(r3)\n" |
| " addi r3,r3,2\n" |
| "6: bge r7,r6,1b\n" |
| "10:ldw r2,0(r5)\n" |
| " addi r6,r6,-4\n" |
| " addi r5,r5,4\n" |
| " stw r2,0(r3)\n" |
| " addi r3,r3,4\n" |
| " br 6b\n" |
| "7: ldbu r2,0(r5)\n" |
| " addi r6,r6,-1\n" |
| " addi r5,r5,1\n" |
| " addi r3,r4,1\n" |
| " stb r2,0(r4)\n" |
| " br 5b\n" |
| ".section __ex_table,\"a\"\n" |
| ".word 2b,3b\n" |
| ".word 9b,13b\n" |
| ".word 10b,13b\n" |
| ".word 7b,13b\n" |
| ".previous\n" |
| ); |
| EXPORT_SYMBOL(__copy_from_user); |
| |
| asm( |
| " .global __copy_to_user\n" |
| " .type __copy_to_user, @function\n" |
| "__copy_to_user:\n" |
| " movi r2,7\n" |
| " mov r3,r4\n" |
| " bge r2,r6,1f\n" |
| " xor r2,r4,r5\n" |
| " andi r2,r2,3\n" |
| " movi r7,3\n" |
| " beq r2,zero,4f\n" |
| /* Bail if we try to copy zero bytes */ |
| "1: addi r6,r6,-1\n" |
| " movi r2,-1\n" |
| " beq r6,r2,3f\n" |
| /* Copy byte by byte for small copies and if src^dst != 0 */ |
| " mov r7,r2\n" |
| "2: ldbu r2,0(r5)\n" |
| " addi r5,r5,1\n" |
| "9: stb r2,0(r3)\n" |
| " addi r6,r6,-1\n" |
| " addi r3,r3,1\n" |
| " bne r6,r7,2b\n" |
| "3: addi r2,r6,1\n" |
| " ret\n" |
| "13:mov r2,r6\n" |
| " ret\n" |
| /* If 'to' is an odd address byte copy */ |
| "4: andi r2,r4,1\n" |
| " cmpeq r2,r2,zero\n" |
| " beq r2,zero,7f\n" |
| /* If 'to' is not divideable by four copy halfwords */ |
| "5: andi r2,r3,2\n" |
| " beq r2,zero,6f\n" |
| " ldhu r2,0(r5)\n" |
| " addi r5,r5,2\n" |
| "10:sth r2,0(r3)\n" |
| " addi r6,r6,-2\n" |
| " addi r3,r3,2\n" |
| /* Copy words */ |
| "6: bge r7,r6,1b\n" |
| " ldw r2,0(r5)\n" |
| " addi r5,r5,4\n" |
| "11:stw r2,0(r3)\n" |
| " addi r6,r6,-4\n" |
| " addi r3,r3,4\n" |
| " br 6b\n" |
| /* Copy remaining bytes */ |
| "7: ldbu r2,0(r5)\n" |
| " addi r5,r5,1\n" |
| " addi r3,r4,1\n" |
| "12: stb r2,0(r4)\n" |
| " addi r6,r6,-1\n" |
| " br 5b\n" |
| ".section __ex_table,\"a\"\n" |
| ".word 9b,3b\n" |
| ".word 10b,13b\n" |
| ".word 11b,13b\n" |
| ".word 12b,13b\n" |
| ".previous\n"); |
| EXPORT_SYMBOL(__copy_to_user); |
| |
| long strncpy_from_user(char *__to, const char __user *__from, long __len) |
| { |
| int l = strnlen_user(__from, __len); |
| int is_zt = 1; |
| |
| if (l > __len) { |
| is_zt = 0; |
| l = __len; |
| } |
| |
| if (l == 0 || copy_from_user(__to, __from, l)) |
| return -EFAULT; |
| |
| if (is_zt) |
| l--; |
| return l; |
| } |
| |
| long strnlen_user(const char __user *s, long n) |
| { |
| long i; |
| |
| for (i = 0; i < n; i++) { |
| char c; |
| |
| if (get_user(c, s + i) == -EFAULT) |
| return 0; |
| if (c == 0) |
| return i + 1; |
| } |
| return n + 1; |
| } |
