| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited | |
| */ | |
| #include <asm/asm.h> | |
| #include <asm/asmmacro.h> | |
| #include <asm/asm-offsets.h> | |
| #include <asm/loongarch.h> | |
| #include <asm/regdef.h> | |
| #include <asm/stackframe.h> | |
| #include <asm/thread_info.h> | |
| /* | |
| * task_struct *__switch_to(task_struct *prev, task_struct *next, | |
| * void *sched_ra, void *sched_cfa) | |
| */ | |
| .align 5 | |
| SYM_FUNC_START(__switch_to) | |
| #ifdef CONFIG_32BIT | |
| PTR_ADDI a0, a0, TASK_STRUCT_OFFSET | |
| PTR_ADDI a1, a1, TASK_STRUCT_OFFSET | |
| #endif | |
| csrrd t1, LOONGARCH_CSR_PRMD | |
| LONG_SPTR t1, a0, (THREAD_CSRPRMD - TASK_STRUCT_OFFSET) | |
| cpu_save_nonscratch a0 | |
| LONG_SPTR a2, a0, (THREAD_SCHED_RA - TASK_STRUCT_OFFSET) | |
| LONG_SPTR a3, a0, (THREAD_SCHED_CFA - TASK_STRUCT_OFFSET) | |
| #if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) | |
| la t7, __stack_chk_guard | |
| LONG_LPTR t8, a1, (TASK_STACK_CANARY - TASK_STRUCT_OFFSET) | |
| LONG_SPTR t8, t7, 0 | |
| #endif | |
| move tp, a1 | |
| cpu_restore_nonscratch a1 | |
| LONG_LPTR t0, a1, (TASK_STACK - TASK_STRUCT_OFFSET) | |
| PTR_LI t1, _THREAD_SIZE | |
| PTR_ADD t0, t0, t1 | |
| set_saved_sp t0, t1, t2 | |
| LONG_LPTR t1, a1, (THREAD_CSRPRMD - TASK_STRUCT_OFFSET) | |
| csrwr t1, LOONGARCH_CSR_PRMD | |
| #ifdef CONFIG_32BIT | |
| PTR_ADDI a0, a0, -TASK_STRUCT_OFFSET | |
| PTR_ADDI tp, tp, -TASK_STRUCT_OFFSET | |
| #endif | |
| jr ra | |
| SYM_FUNC_END(__switch_to) |