| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
| */ |
| |
| #include <linux/linkage.h> |
| |
| #include <asm/asm.h> |
| #include <asm/asmmacro.h> |
| #include <asm/asm-extable.h> |
| #include <asm/errno.h> |
| #include <asm/regdef.h> |
| |
| .L_fixup_handle_unaligned: |
| li.w a0, -EFAULT |
| jr ra |
| |
| /* |
| * unsigned long unaligned_read(void *addr, void *value, unsigned long n, bool sign) |
| * |
| * a0: addr |
| * a1: value |
| * a2: n |
| * a3: sign |
| */ |
| SYM_FUNC_START(unaligned_read) |
| beqz a2, 5f |
| |
| li.w t2, 0 |
| addi.d t0, a2, -1 |
| slli.d t1, t0, 3 |
| add.d a0, a0, t0 |
| |
| beqz a3, 2f |
| 1: ld.b t3, a0, 0 |
| b 3f |
| |
| 2: ld.bu t3, a0, 0 |
| 3: sll.d t3, t3, t1 |
| or t2, t2, t3 |
| addi.d t1, t1, -8 |
| addi.d a0, a0, -1 |
| addi.d a2, a2, -1 |
| bgtz a2, 2b |
| 4: st.d t2, a1, 0 |
| |
| move a0, a2 |
| jr ra |
| |
| 5: li.w a0, -EFAULT |
| jr ra |
| |
| _asm_extable 1b, .L_fixup_handle_unaligned |
| _asm_extable 2b, .L_fixup_handle_unaligned |
| _asm_extable 4b, .L_fixup_handle_unaligned |
| SYM_FUNC_END(unaligned_read) |
| |
| /* |
| * unsigned long unaligned_write(void *addr, unsigned long value, unsigned long n) |
| * |
| * a0: addr |
| * a1: value |
| * a2: n |
| */ |
| SYM_FUNC_START(unaligned_write) |
| beqz a2, 3f |
| |
| li.w t0, 0 |
| 1: srl.d t1, a1, t0 |
| 2: st.b t1, a0, 0 |
| addi.d t0, t0, 8 |
| addi.d a2, a2, -1 |
| addi.d a0, a0, 1 |
| bgtz a2, 1b |
| |
| move a0, a2 |
| jr ra |
| |
| 3: li.w a0, -EFAULT |
| jr ra |
| |
| _asm_extable 2b, .L_fixup_handle_unaligned |
| SYM_FUNC_END(unaligned_write) |
