LoongArch: Add STACKTRACE support
[linux-2.6-microblaze.git] / arch / loongarch / kernel / switch.S
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         move    tp, a2
27         cpu_restore_nonscratch a1
28
29         li.w            t0, _THREAD_SIZE - 32
30         PTR_ADD         t0, t0, tp
31         set_saved_sp    t0, t1, t2
32
33         ldptr.d t1, a1, THREAD_CSRPRMD
34         csrwr   t1, LOONGARCH_CSR_PRMD
35
36         jr      ra
37 SYM_FUNC_END(__switch_to)