| /* 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) |