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 | #include <asm/unwind_hints.h> |
18 | |
19 | .text |
20 | .cfi_sections .debug_frame |
21 | .align 5 |
22 | SYM_CODE_START(handle_syscall) |
23 | UNWIND_HINT_UNDEFINED |
24 | csrrd t0, PERCPU_BASE_KS |
25 | la.pcrel t1, kernelsp |
26 | add.d t1, t1, t0 |
27 | move t2, sp |
28 | ld.d sp, t1, 0 |
29 | |
30 | addi.d sp, sp, -PT_SIZE |
31 | cfi_st t2, PT_R3 |
32 | cfi_rel_offset sp, PT_R3 |
33 | st.d zero, sp, PT_R0 |
34 | csrrd t2, LOONGARCH_CSR_PRMD |
35 | st.d t2, sp, PT_PRMD |
36 | csrrd t2, LOONGARCH_CSR_CRMD |
37 | st.d t2, sp, PT_CRMD |
38 | csrrd t2, LOONGARCH_CSR_EUEN |
39 | st.d t2, sp, PT_EUEN |
40 | csrrd t2, LOONGARCH_CSR_ECFG |
41 | st.d t2, sp, PT_ECFG |
42 | csrrd t2, LOONGARCH_CSR_ESTAT |
43 | st.d t2, sp, PT_ESTAT |
44 | cfi_st ra, PT_R1 |
45 | cfi_st a0, PT_R4 |
46 | cfi_st a1, PT_R5 |
47 | cfi_st a2, PT_R6 |
48 | cfi_st a3, PT_R7 |
49 | cfi_st a4, PT_R8 |
50 | cfi_st a5, PT_R9 |
51 | cfi_st a6, PT_R10 |
52 | cfi_st a7, PT_R11 |
53 | csrrd ra, LOONGARCH_CSR_ERA |
54 | st.d ra, sp, PT_ERA |
55 | cfi_rel_offset ra, PT_ERA |
56 | |
57 | cfi_st tp, PT_R2 |
58 | cfi_st u0, PT_R21 |
59 | cfi_st fp, PT_R22 |
60 | |
61 | SAVE_STATIC |
62 | UNWIND_HINT_REGS |
63 | |
64 | #ifdef CONFIG_KGDB |
65 | li.w t1, CSR_CRMD_WE |
66 | csrxchg t1, t1, LOONGARCH_CSR_CRMD |
67 | #endif |
68 | |
69 | move u0, t0 |
70 | li.d tp, ~_THREAD_MASK |
71 | and tp, tp, sp |
72 | |
73 | move a0, sp |
74 | bl do_syscall |
75 | |
76 | RESTORE_ALL_AND_RET |
77 | SYM_CODE_END(handle_syscall) |
78 | _ASM_NOKPROBE(handle_syscall) |
79 | |
80 | SYM_CODE_START(ret_from_fork) |
81 | UNWIND_HINT_REGS |
82 | bl schedule_tail # a0 = struct task_struct *prev |
83 | move a0, sp |
84 | bl syscall_exit_to_user_mode |
85 | RESTORE_STATIC |
86 | RESTORE_SOME |
87 | RESTORE_SP_AND_RET |
88 | SYM_CODE_END(ret_from_fork) |
89 | |
90 | SYM_CODE_START(ret_from_kernel_thread) |
91 | UNWIND_HINT_REGS |
92 | bl schedule_tail # a0 = struct task_struct *prev |
93 | move a0, s1 |
94 | jirl ra, s0, 0 |
95 | move a0, sp |
96 | bl syscall_exit_to_user_mode |
97 | RESTORE_STATIC |
98 | RESTORE_SOME |
99 | RESTORE_SP_AND_RET |
100 | SYM_CODE_END(ret_from_kernel_thread) |
101 | |