1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology
4 *
5 * Derived from MIPS:
6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf
7 * Copyright (C) 1999, 2000 Silicon Graphics,
8 * Copyright (C) 2002, 2007 Maciej W. Rozycki
9 * Copyright (C) 2001, 2012 MIPS Technologies,
10 */
11 #include <asm/asm.h>
12 #include <asm/asmmacro.h>
13 #include <asm/loongarch.h>
14 #include <asm/regdef.h>
15 #include <asm/fpregdef.h>
16 #include <asm/stackframe.h>
17 #include <asm/thread_info.h>
18
19 .align 5
20 SYM_FUNC_START(__arch_cpu_idle)
21 /* start of rollback region */
22 LONG_L t0, tp, TI_FLAGS
23 nop
24 andi t0, t0, _TIF_NEED_RESCHED
25 bnez t0, 1f
26 nop
27 nop
28 nop
29 idle 0
30 /* end of rollback region */
31 1: jr ra
32 SYM_FUNC_END(__arch_cpu_idle)
33
34 SYM_CODE_START(handle_vint)
35 UNWIND_HINT_UNDEFINED
36 BACKUP_T0T1
37 SAVE_ALL
38 la_abs t1, __arch_cpu_idle
39 LONG_L t0, sp, PT_ERA
40 /* 32 byte rollback region */
41 ori t0, t0, 0x1f
42 xori t0, t0, 0x1f
43 bne t0, t1, 1f
44 LONG_S t0, sp, PT_ERA
45 1: move a0, sp
46 move a1, sp
47 la_abs t0, do_vint
48 jirl ra, t0, 0
49 RESTORE_ALL_AND_RET
50 SYM_CODE_END(handle_vint)
51
52 SYM_CODE_START(except_vec_cex)
53 UNWIND_HINT_UNDEFINED
54 b cache_parity_error
55 SYM_CODE_END(except_vec_cex)
56
57 .macro build_prep_badv
58 csrrd t0, LOONGARCH_CSR_BADV
59 PTR_S t0, sp, PT_BVADDR
60 .endm
61
62 .macro build_prep_fcsr
63 movfcsr2gr a1, fcsr0
64 .endm
65
66 .macro build_prep_none
67 .endm
68
69 .macro BUILD_HANDLER exception handle
70 .align 5
71 SYM_CODE_START(handle_\exception)
72 UNWIND_HINT_UNDEFINED
73 666:
74 BACKUP_T0T1
75 SAVE_ALL
76 build_prep_\prep
77 move a0, sp
78 la_abs t0, do_\handler
79 jirl ra, t0, 0
80 668:
81 RESTORE_ALL_AND_RET
82 SYM_CODE_END(handle_\exception)
83 .pushsection ".data", "aw", %progbi
84 SYM_DATA(unwind_hint_\exception, .word
85 .popsection
86 .endm
87
88 BUILD_HANDLER ade ade badv
89 BUILD_HANDLER ale ale badv
90 BUILD_HANDLER bce bce none
91 BUILD_HANDLER bp bp none
92 BUILD_HANDLER fpe fpe fcsr
93 BUILD_HANDLER fpu fpu none
94 BUILD_HANDLER lsx lsx none
95 BUILD_HANDLER lasx lasx none
96 BUILD_HANDLER lbt lbt none
97 BUILD_HANDLER ri ri none
98 BUILD_HANDLER watch watch none
99 BUILD_HANDLER reserved reserved none
100
101 SYM_CODE_START(handle_sys)
102 UNWIND_HINT_UNDEFINED
103 la_abs t0, handle_syscall
104 jr t0
105 SYM_CODE_END(handle_sys)
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