| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /** |
| * Adopted for the Linux kernel from IPXE project, see |
| * https://github.com/ipxe/ipxe/blob/master/src/arch/riscv32/libgcc/llshift.S |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/asm.h> |
| |
| /** |
| * Arithmetic shift right |
| * |
| * @v a1:a0 Value to shift |
| * @v a2 Shift amount |
| * @ret a1:a0 Shifted value |
| */ |
| |
| SYM_FUNC_START(__ashrdi3) |
| |
| /* Perform shift by 32 bits, if applicable */ |
| li t0, 32 |
| sub t1, t0, a2 |
| bgtz t1, 1f |
| mv a0, a1 |
| srai a1, a1, 31 |
| 1: /* Perform shift by modulo-32 bits, if applicable */ |
| andi a2, a2, 0x1f |
| beqz a2, 2f |
| sll t2, a1, t1 |
| sra a1, a1, a2 |
| srl a0, a0, a2 |
| or a0, a0, t2 |
| 2: ret |
| |
| SYM_FUNC_END(__ashrdi3) |
| EXPORT_SYMBOL(__ashrdi3) |
