diff options
Diffstat (limited to 'arch/arm64/lib')
| -rw-r--r-- | arch/arm64/lib/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm64/lib/tishift.S | 59 |
2 files changed, 60 insertions, 1 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index a0abc14..55bdb01 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -2,7 +2,7 @@ lib-y := bitops.o clear_user.o delay.o copy_from_user.o \ copy_to_user.o copy_in_user.o copy_page.o \ clear_page.o memchr.o memcpy.o memmove.o memset.o \ memcmp.o strcmp.o strncmp.o strlen.o strnlen.o \ - strchr.o strrchr.o + strchr.o strrchr.o tishift.o # Tell the compiler to treat all general purpose registers (with the # exception of the IP registers, which are already handled by the caller diff --git a/arch/arm64/lib/tishift.S b/arch/arm64/lib/tishift.S new file mode 100644 index 0000000..7236776 --- /dev/null +++ b/arch/arm64/lib/tishift.S @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/linkage.h> + +ENTRY(__ashlti3) + cbz x2, 1f + mov x3, #64 + sub x3, x3, x2 + cmp x3, #0 + b.le 2f + lsl x1, x1, x2 + lsr x3, x0, x3 + lsl x2, x0, x2 + orr x1, x1, x3 + mov x0, x2 +1: + ret +2: + neg w1, w3 + mov x2, #0 + lsl x1, x0, x1 + mov x0, x2 + ret +ENDPROC(__ashlti3) + +ENTRY(__ashrti3) + cbz x2, 3f + mov x3, #64 + sub x3, x3, x2 + cmp x3, #0 + b.le 4f + lsr x0, x0, x2 + lsl x3, x1, x3 + asr x2, x1, x2 + orr x0, x0, x3 + mov x1, x2 +3: + ret +4: + neg w0, w3 + asr x2, x1, #63 + asr x0, x1, x0 + mov x1, x2 + ret +ENDPROC(__ashrti3) |
