1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
4 | */ |
5 | #include <asm/asm.h> |
6 | #include <asm/asmmacro.h> |
7 | #include <asm/asm-offsets.h> |
8 | #include <asm/loongarch.h> |
9 | #include <asm/regdef.h> |
10 | #include <asm/stackframe.h> |
11 | #include <asm/thread_info.h> |
12 | |
13 | /* |
14 | * task_struct *__switch_to(task_struct *prev, task_struct *next, |
15 | * struct thread_info *next_ti) |
16 | */ |
17 | .align 5 |
18 | SYM_FUNC_START(__switch_to) |
19 | csrrd t1, LOONGARCH_CSR_PRMD |
20 | stptr.d t1, a0, THREAD_CSRPRMD |
21 | |
22 | cpu_save_nonscratch a0 |
23 | stptr.d ra, a0, THREAD_REG01 |
24 | stptr.d a3, a0, THREAD_SCHED_RA |
25 | stptr.d a4, a0, THREAD_SCHED_CFA |
26 | #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) |
27 | la t7, __stack_chk_guard |
28 | LONG_L t8, a1, TASK_STACK_CANARY |
29 | LONG_S t8, t7, 0 |
30 | #endif |
31 | move tp, a2 |
32 | cpu_restore_nonscratch a1 |
33 | |
34 | li.w t0, _THREAD_SIZE |
35 | PTR_ADD t0, t0, tp |
36 | set_saved_sp t0, t1, t2 |
37 | |
38 | ldptr.d t1, a1, THREAD_CSRPRMD |
39 | csrwr t1, LOONGARCH_CSR_PRMD |
40 | |
41 | jr ra |
42 | SYM_FUNC_END(__switch_to) |
43 | |