1 /* SPDX-License-Identifier: GPL-2.0+ */
2 #include <linux/linkage.h>
3 #include <asm/stackframe.h>
4
5 .text
6
7 .macro save_all_base_regs
8 cfi_st ra, PT_R1
9 cfi_st tp, PT_R2
10 cfi_st a0, PT_R4
11 cfi_st a1, PT_R5
12 cfi_st a2, PT_R6
13 cfi_st a3, PT_R7
14 cfi_st a4, PT_R8
15 cfi_st a5, PT_R9
16 cfi_st a6, PT_R10
17 cfi_st a7, PT_R11
18 cfi_st t0, PT_R12
19 cfi_st t1, PT_R13
20 cfi_st t2, PT_R14
21 cfi_st t3, PT_R15
22 cfi_st t4, PT_R16
23 cfi_st t5, PT_R17
24 cfi_st t6, PT_R18
25 cfi_st t7, PT_R19
26 cfi_st t8, PT_R20
27 cfi_st u0, PT_R21
28 cfi_st fp, PT_R22
29 cfi_st s0, PT_R23
30 cfi_st s1, PT_R24
31 cfi_st s2, PT_R25
32 cfi_st s3, PT_R26
33 cfi_st s4, PT_R27
34 cfi_st s5, PT_R28
35 cfi_st s6, PT_R29
36 cfi_st s7, PT_R30
37 cfi_st s8, PT_R31
38 csrrd t0, LOONGARCH_CSR_CRMD
39 andi t0, t0, 0x7 /* extract bit[1:0
40 LONG_S t0, sp, PT_CRMD
41 .endm
42
43 .macro restore_all_base_regs
44 cfi_ld tp, PT_R2
45 cfi_ld a0, PT_R4
46 cfi_ld a1, PT_R5
47 cfi_ld a2, PT_R6
48 cfi_ld a3, PT_R7
49 cfi_ld a4, PT_R8
50 cfi_ld a5, PT_R9
51 cfi_ld a6, PT_R10
52 cfi_ld a7, PT_R11
53 cfi_ld t0, PT_R12
54 cfi_ld t1, PT_R13
55 cfi_ld t2, PT_R14
56 cfi_ld t3, PT_R15
57 cfi_ld t4, PT_R16
58 cfi_ld t5, PT_R17
59 cfi_ld t6, PT_R18
60 cfi_ld t7, PT_R19
61 cfi_ld t8, PT_R20
62 cfi_ld u0, PT_R21
63 cfi_ld fp, PT_R22
64 cfi_ld s0, PT_R23
65 cfi_ld s1, PT_R24
66 cfi_ld s2, PT_R25
67 cfi_ld s3, PT_R26
68 cfi_ld s4, PT_R27
69 cfi_ld s5, PT_R28
70 cfi_ld s6, PT_R29
71 cfi_ld s7, PT_R30
72 cfi_ld s8, PT_R31
73 LONG_L t0, sp, PT_CRMD
74 li.d t1, 0x7 /* mask bit[1:0] PLV,
75 csrxchg t0, t1, LOONGARCH_CSR_CRMD
76 .endm
77
78 SYM_CODE_START(arch_rethook_trampoline)
79 UNWIND_HINT_UNDEFINED
80 addi.d sp, sp, -PT_SIZE
81 save_all_base_regs
82
83 addi.d t0, sp, PT_SIZE
84 LONG_S t0, sp, PT_R3
85
86 move a0, sp /* pt_regs */
87
88 bl arch_rethook_trampoline_callback
89
90 /* use the result as the return-addres
91 move ra, a0
92
93 restore_all_base_regs
94 addi.d sp, sp, PT_SIZE
95
96 jr ra
97 SYM_CODE_END(arch_rethook_trampoline)
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