diff options
Diffstat (limited to 'arch/m68k/lib')
| -rw-r--r-- | arch/m68k/lib/Makefile | 4 | ||||
| -rw-r--r-- | arch/m68k/lib/uaccess.c | 222 |
2 files changed, 224 insertions, 2 deletions
diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile index ebe51a513817..6bbf19f96007 100644 --- a/arch/m68k/lib/Makefile +++ b/arch/m68k/lib/Makefile @@ -4,5 +4,5 @@ EXTRA_AFLAGS := -traditional -lib-y := ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \ - checksum.o string.o semaphore.o +lib-y := ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \ + checksum.o string.o semaphore.o uaccess.o diff --git a/arch/m68k/lib/uaccess.c b/arch/m68k/lib/uaccess.c new file mode 100644 index 000000000000..1bc188c0d983 --- /dev/null +++ b/arch/m68k/lib/uaccess.c @@ -0,0 +1,222 @@ +/* + * 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. + */ + +#include <linux/module.h> +#include <asm/uaccess.h> + +unsigned long __generic_copy_from_user(void *to, const void __user *from, + unsigned long n) +{ + unsigned long tmp, res; + + asm volatile ("\n" + " tst.l %0\n" + " jeq 2f\n" + "1: moves.l (%1)+,%3\n" + " move.l %3,(%2)+\n" + " subq.l #1,%0\n" + " jne 1b\n" + "2: btst #1,%5\n" + " jeq 4f\n" + "3: moves.w (%1)+,%3\n" + " move.w %3,(%2)+\n" + "4: btst #0,%5\n" + " jeq 6f\n" + "5: moves.b (%1)+,%3\n" + " move.b %3,(%2)+\n" + "6:\n" + " .section .fixup,\"ax\"\n" + " .even\n" + "10: move.l %0,%3\n" + "7: clr.l (%2)+\n" + " subq.l #1,%3\n" + " jne 7b\n" + " lsl.l #2,%0\n" + " btst #1,%5\n" + " jeq 8f\n" + "30: clr.w (%2)+\n" + " addq.l #2,%0\n" + "8: btst #0,%5\n" + " jeq 6b\n" + "50: clr.b (%2)+\n" + " addq.l #1,%0\n" + " jra 6b\n" + " .previous\n" + "\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .long 1b,10b\n" + " .long 3b,30b\n" + " .long 5b,50b\n" + " .previous" + : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp) + : "0" (n / 4), "d" (n & 3)); + + return res; +} +EXPORT_SYMBOL(__generic_copy_from_user); + +unsigned long __generic_copy_to_user(void __user *to, const void *from, + unsigned long n) +{ + unsigned long tmp, res; + + asm volatile ("\n" + " tst.l %0\n" + " jeq 4f\n" + "1: move.l (%1)+,%3\n" + "2: moves.l %3,(%2)+\n" + "3: subq.l #1,%0\n" + " jne 1b\n" + "4: btst #1,%5\n" + " jeq 6f\n" + " move.w (%1)+,%3\n" + "5: moves.w %3,(%2)+\n" + "6: btst #0,%5\n" + " jeq 8f\n" + " move.b (%1)+,%3\n" + "7: moves.b %3,(%2)+\n" + "8:\n" + " .section .fixup,\"ax\"\n" + " .even\n" + "20: lsl.l #2,%0\n" + "50: add.l %5,%0\n" + " jra 7b\n" + " .previous\n" + "\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .long 2b,20b\n" + " .long 3b,20b\n" + " .long 5b,50b\n" + " .long 6b,50b\n" + " .long 7b,50b\n" + " .long 8b,50b\n" + " .previous" + : "=d" (res), "+a" (from), "+a" (to), "=&r" (tmp) + : "0" (n / 4), "d" (n & 3)); + + return res; +} +EXPORT_SYMBOL(__generic_copy_to_user); + +/* + * Copy a null terminated string from userspace. + */ +long strncpy_from_user(char *dst, const char __user *src, long count) +{ + long res; + char c; + + if (count <= 0) + return count; + + asm volatile ("\n" + "1: moves.b (%2)+,%4\n" + " move.b %4,(%1)+\n" + " jeq 2f\n" + " subq.l #1,%3\n" + " jne 1b\n" + "2: sub.l %3,%0\n" + "3:\n" + " .section .fixup,\"ax\"\n" + " .even\n" + "10: move.l %5,%0\n" + " jra 3b\n" + " .previous\n" + "\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .long 1b,10b\n" + " .previous" + : "=d" (res), "+a" (dst), "+a" (src), "+r" (count), "=&d" (c) + : "i" (-EFAULT), "0" (count)); + + return res; +} +EXPORT_SYMBOL(strncpy_from_user); + +/* + * Return the size of a string (including the ending 0) + * + * Return 0 on exception, a value greater than N if too long + */ +long strnlen_user(const char __user *src, long n) +{ + char c; + long res; + + asm volatile ("\n" + "1: subq.l #1,%1\n" + " jmi 3f\n" + "2: moves.b (%0)+,%2\n" + " tst.b %2\n" + " jne 1b\n" + " jra 4f\n" + "\n" + "3: addq.l #1,%0\n" + "4: sub.l %4,%0\n" + "5:\n" + " .section .fixup,\"ax\"\n" + " .even\n" + "20: sub.l %0,%0\n" + " jra 5b\n" + " .previous\n" + "\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .long 2b,20b\n" + " .previous\n" + : "=&a" (res), "+d" (n), "=&d" (c) + : "0" (src), "r" (src)); + + return res; +} +EXPORT_SYMBOL(strnlen_user); + +/* + * Zero Userspace + */ + +unsigned long clear_user(void __user *to, unsigned long n) +{ + unsigned long res; + + asm volatile ("\n" + " tst.l %0\n" + " jeq 3f\n" + "1: moves.l %2,(%1)+\n" + "2: subq.l #1,%0\n" + " jne 1b\n" + "3: btst #1,%4\n" + " jeq 5f\n" + "4: moves.w %2,(%1)+\n" + "5: btst #0,%4\n" + " jeq 7f\n" + "6: moves.b %2,(%1)\n" + "7:\n" + " .section .fixup,\"ax\"\n" + " .even\n" + "10: lsl.l #2,%0\n" + "40: add.l %4,%0\n" + " jra 7b\n" + " .previous\n" + "\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .long 1b,10b\n" + " .long 2b,10b\n" + " .long 4b,40b\n" + " .long 5b,40b\n" + " .long 6b,40b\n" + " .long 7b,40b\n" + " .previous" + : "=d" (res), "+a" (to) + : "r" (0), "0" (n / 4), "d" (n & 3)); + + return res; +} +EXPORT_SYMBOL(clear_user); |