/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2020-2022 Loongson Technology Corporation Limited * * Derived from MIPS: * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */ #include <asm/asm.h> #include <asm/asmmacro.h> #include <asm/loongarch.h> #include <asm/regdef.h> #include <asm/stackframe.h> #include <asm/thread_info.h> .text .cfi_sections .debug_frame .align 5 SYM_CODE_START(handle_syscall) csrrd t0, PERCPU_BASE_KS la.pcrel t1, kernelsp add.d t1, t1, t0 move t2, sp ld.d sp, t1, 0 addi.d sp, sp, -PT_SIZE cfi_st t2, PT_R3 cfi_rel_offset sp, PT_R3 st.d zero, sp, PT_R0 csrrd t2, LOONGARCH_CSR_PRMD st.d t2, sp, PT_PRMD csrrd t2, LOONGARCH_CSR_CRMD st.d t2, sp, PT_CRMD csrrd t2, LOONGARCH_CSR_EUEN st.d t2, sp, PT_EUEN csrrd t2, LOONGARCH_CSR_ECFG st.d t2, sp, PT_ECFG csrrd t2, LOONGARCH_CSR_ESTAT st.d t2, sp, PT_ESTAT cfi_st ra, PT_R1 cfi_st a0, PT_R4 cfi_st a1, PT_R5 cfi_st a2, PT_R6 cfi_st a3, PT_R7 cfi_st a4, PT_R8 cfi_st a5, PT_R9 cfi_st a6, PT_R10 cfi_st a7, PT_R11 csrrd ra, LOONGARCH_CSR_ERA st.d ra, sp, PT_ERA cfi_rel_offset ra, PT_ERA cfi_st tp, PT_R2 cfi_st u0, PT_R21 cfi_st fp, PT_R22 SAVE_STATIC #ifdef CONFIG_KGDB li.w t1, CSR_CRMD_WE csrxchg t1, t1, LOONGARCH_CSR_CRMD #endif move u0, t0 li.d tp, ~_THREAD_MASK and tp, tp, sp move a0, sp bl do_syscall RESTORE_ALL_AND_RET SYM_CODE_END(handle_syscall) _ASM_NOKPROBE(handle_syscall) SYM_CODE_START(ret_from_fork) bl schedule_tail # a0 = struct task_struct *prev move a0, sp bl syscall_exit_to_user_mode RESTORE_STATIC RESTORE_SOME RESTORE_SP_AND_RET SYM_CODE_END(ret_from_fork) SYM_CODE_START(ret_from_kernel_thread) bl schedule_tail # a0 = struct task_struct *prev move a0, s1 jirl ra, s0, 0 move a0, sp bl syscall_exit_to_user_mode RESTORE_STATIC RESTORE_SOME RESTORE_SP_AND_RET SYM_CODE_END(ret_from_kernel_thread)