1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/** 3 * Adopted for the Linux kernel from IPXE project, see 4 * https://github.com/ipxe/ipxe/blob/master/src/arch/riscv32/libgcc/llshift.S 5 */ 6 7#include <linux/linkage.h> 8#include <asm/asm.h> 9 10/** 11 * Arithmetic shift right 12 * 13 * @v a1:a0 Value to shift 14 * @v a2 Shift amount 15 * @ret a1:a0 Shifted value 16 */ 17 18SYM_FUNC_START(__ashrdi3) 19 20 /* Perform shift by 32 bits, if applicable */ 21 li t0, 32 22 sub t1, t0, a2 23 bgtz t1, 1f 24 mv a0, a1 25 srai a1, a1, 31 261: /* Perform shift by modulo-32 bits, if applicable */ 27 andi a2, a2, 0x1f 28 beqz a2, 2f 29 sll t2, a1, t1 30 sra a1, a1, a2 31 srl a0, a0, a2 32 or a0, a0, t2 332: ret 34 35SYM_FUNC_END(__ashrdi3) 36EXPORT_SYMBOL(__ashrdi3) 37