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
18SYM_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
42SYM_FUNC_END(__switch_to)
43

source code of linux/arch/loongarch/kernel/switch.S