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- /* SPDX-License-Identifier: GPL-2.0 */
- /* Copyright (C) 2023 Rivos Inc. */
- #include <linux/linkage.h>
- #include <asm/asm.h>
- .text
- /* void __riscv_copy_words_unaligned(void *, const void *, size_t) */
- /* Performs a memcpy without aligning buffers, using word loads and stores. */
- /* Note: The size is truncated to a multiple of 8 * SZREG */
- SYM_FUNC_START(__riscv_copy_words_unaligned)
- andi a4, a2, ~((8*SZREG)-1)
- beqz a4, 2f
- add a3, a1, a4
- 1:
- REG_L a4, 0(a1)
- REG_L a5, SZREG(a1)
- REG_L a6, 2*SZREG(a1)
- REG_L a7, 3*SZREG(a1)
- REG_L t0, 4*SZREG(a1)
- REG_L t1, 5*SZREG(a1)
- REG_L t2, 6*SZREG(a1)
- REG_L t3, 7*SZREG(a1)
- REG_S a4, 0(a0)
- REG_S a5, SZREG(a0)
- REG_S a6, 2*SZREG(a0)
- REG_S a7, 3*SZREG(a0)
- REG_S t0, 4*SZREG(a0)
- REG_S t1, 5*SZREG(a0)
- REG_S t2, 6*SZREG(a0)
- REG_S t3, 7*SZREG(a0)
- addi a0, a0, 8*SZREG
- addi a1, a1, 8*SZREG
- bltu a1, a3, 1b
- 2:
- ret
- SYM_FUNC_END(__riscv_copy_words_unaligned)
- /* void __riscv_copy_bytes_unaligned(void *, const void *, size_t) */
- /* Performs a memcpy without aligning buffers, using only byte accesses. */
- /* Note: The size is truncated to a multiple of 8 */
- SYM_FUNC_START(__riscv_copy_bytes_unaligned)
- andi a4, a2, ~(8-1)
- beqz a4, 2f
- add a3, a1, a4
- 1:
- lb a4, 0(a1)
- lb a5, 1(a1)
- lb a6, 2(a1)
- lb a7, 3(a1)
- lb t0, 4(a1)
- lb t1, 5(a1)
- lb t2, 6(a1)
- lb t3, 7(a1)
- sb a4, 0(a0)
- sb a5, 1(a0)
- sb a6, 2(a0)
- sb a7, 3(a0)
- sb t0, 4(a0)
- sb t1, 5(a0)
- sb t2, 6(a0)
- sb t3, 7(a0)
- addi a0, a0, 8
- addi a1, a1, 8
- bltu a1, a3, 1b
- 2:
- ret
- SYM_FUNC_END(__riscv_copy_bytes_unaligned)
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