1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 * 5 * Derived from MIPS: 6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Copyright (C) 2001 MIPS Technologies, Inc. 9 */ 10 11#include <asm/asm.h> 12#include <asm/asmmacro.h> 13#include <asm/loongarch.h> 14#include <asm/regdef.h> 15#include <asm/stackframe.h> 16#include <asm/thread_info.h> 17 18 .text 19 .cfi_sections .debug_frame 20 .align 5 21SYM_CODE_START(handle_syscall) 22 csrrd t0, PERCPU_BASE_KS 23 la.pcrel t1, kernelsp 24 add.d t1, t1, t0 25 move t2, sp 26 ld.d sp, t1, 0 27 28 addi.d sp, sp, -PT_SIZE 29 cfi_st t2, PT_R3 30 cfi_rel_offset sp, PT_R3 31 st.d zero, sp, PT_R0 32 csrrd t2, LOONGARCH_CSR_PRMD 33 st.d t2, sp, PT_PRMD 34 csrrd t2, LOONGARCH_CSR_CRMD 35 st.d t2, sp, PT_CRMD 36 csrrd t2, LOONGARCH_CSR_EUEN 37 st.d t2, sp, PT_EUEN 38 csrrd t2, LOONGARCH_CSR_ECFG 39 st.d t2, sp, PT_ECFG 40 csrrd t2, LOONGARCH_CSR_ESTAT 41 st.d t2, sp, PT_ESTAT 42 cfi_st ra, PT_R1 43 cfi_st a0, PT_R4 44 cfi_st a1, PT_R5 45 cfi_st a2, PT_R6 46 cfi_st a3, PT_R7 47 cfi_st a4, PT_R8 48 cfi_st a5, PT_R9 49 cfi_st a6, PT_R10 50 cfi_st a7, PT_R11 51 csrrd ra, LOONGARCH_CSR_ERA 52 st.d ra, sp, PT_ERA 53 cfi_rel_offset ra, PT_ERA 54 55 cfi_st tp, PT_R2 56 cfi_st u0, PT_R21 57 cfi_st fp, PT_R22 58 59 SAVE_STATIC 60 61#ifdef CONFIG_KGDB 62 li.w t1, CSR_CRMD_WE 63 csrxchg t1, t1, LOONGARCH_CSR_CRMD 64#endif 65 66 move u0, t0 67 li.d tp, ~_THREAD_MASK 68 and tp, tp, sp 69 70 move a0, sp 71 bl do_syscall 72 73 RESTORE_ALL_AND_RET 74SYM_CODE_END(handle_syscall) 75_ASM_NOKPROBE(handle_syscall) 76 77SYM_CODE_START(ret_from_fork) 78 bl schedule_tail # a0 = struct task_struct *prev 79 move a0, sp 80 bl syscall_exit_to_user_mode 81 RESTORE_STATIC 82 RESTORE_SOME 83 RESTORE_SP_AND_RET 84SYM_CODE_END(ret_from_fork) 85 86SYM_CODE_START(ret_from_kernel_thread) 87 bl schedule_tail # a0 = struct task_struct *prev 88 move a0, s1 89 jirl ra, s0, 0 90 move a0, sp 91 bl syscall_exit_to_user_mode 92 RESTORE_STATIC 93 RESTORE_SOME 94 RESTORE_SP_AND_RET 95SYM_CODE_END(ret_from_kernel_thread) 96