| /* 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> |
| #include <asm/unwind_hints.h> |
| |
| .text |
| .cfi_sections .debug_frame |
| .align 5 |
| SYM_CODE_START(handle_syscall) |
| UNWIND_HINT_UNDEFINED |
| 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 |
| UNWIND_HINT_REGS |
| |
| #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) |
| UNWIND_HINT_REGS |
| 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) |
| UNWIND_HINT_REGS |
| 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) |
