diff options
| author | Palmer Dabbelt <palmer@dabbelt.com> | 2017-07-10 18:03:19 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@dabbelt.com> | 2017-09-26 15:26:45 -0700 |
| commit | 5d8544e2d0075a5f3c9a2cf27152354d54360da1 (patch) | |
| tree | 56169c3eaeff96fe1d8547c3bac7cfa658af9d60 /arch/riscv/lib/udivdi3.S | |
| parent | fab957c11efe2f405e08b9f0d080524bc2631428 (diff) | |
RISC-V: Generic library routines and assembly
This patch contains code that is more specific to the RISC-V ISA than it
is to Linux. It contains string and math operations, C wrappers for
various assembly instructions, stack walking code, and uaccess.
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Diffstat (limited to 'arch/riscv/lib/udivdi3.S')
| -rw-r--r-- | arch/riscv/lib/udivdi3.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/riscv/lib/udivdi3.S b/arch/riscv/lib/udivdi3.S new file mode 100644 index 000000000000..cb01ae5b181a --- /dev/null +++ b/arch/riscv/lib/udivdi3.S @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2016-2017 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * 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. + */ + + .globl __udivdi3 +__udivdi3: + mv a2, a1 + mv a1, a0 + li a0, -1 + beqz a2, .L5 + li a3, 1 + bgeu a2, a1, .L2 +.L1: + blez a2, .L2 + slli a2, a2, 1 + slli a3, a3, 1 + bgtu a1, a2, .L1 +.L2: + li a0, 0 +.L3: + bltu a1, a2, .L4 + sub a1, a1, a2 + or a0, a0, a3 +.L4: + srli a3, a3, 1 + srli a2, a2, 1 + bnez a3, .L3 +.L5: + ret |