| /* 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, |
| * struct thread_info *next_ti, 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 a3, a0, (THREAD_SCHED_RA - TASK_STRUCT_OFFSET) |
| LONG_SPTR a4, 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, a2 |
| cpu_restore_nonscratch a1 |
| |
| li.w t0, _THREAD_SIZE |
| PTR_ADD t0, t0, tp |
| 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 |
| #endif |
| jr ra |
| SYM_FUNC_END(__switch_to) |
