1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology
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,
15 * struct thread_info
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
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)
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