1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Author: Patrick Stählin <me@packi.ch>
4 */
5#include <linux/linkage.h>
6
7#include <asm/asm.h>
8#include <asm/asm-offsets.h>
9
10	.text
11	.altmacro
12
13	.macro save_all_base_regs
14	REG_S x1,  PT_RA(sp)
15	REG_S x3,  PT_GP(sp)
16	REG_S x4,  PT_TP(sp)
17	REG_S x5,  PT_T0(sp)
18	REG_S x6,  PT_T1(sp)
19	REG_S x7,  PT_T2(sp)
20	REG_S x8,  PT_S0(sp)
21	REG_S x9,  PT_S1(sp)
22	REG_S x10, PT_A0(sp)
23	REG_S x11, PT_A1(sp)
24	REG_S x12, PT_A2(sp)
25	REG_S x13, PT_A3(sp)
26	REG_S x14, PT_A4(sp)
27	REG_S x15, PT_A5(sp)
28	REG_S x16, PT_A6(sp)
29	REG_S x17, PT_A7(sp)
30	REG_S x18, PT_S2(sp)
31	REG_S x19, PT_S3(sp)
32	REG_S x20, PT_S4(sp)
33	REG_S x21, PT_S5(sp)
34	REG_S x22, PT_S6(sp)
35	REG_S x23, PT_S7(sp)
36	REG_S x24, PT_S8(sp)
37	REG_S x25, PT_S9(sp)
38	REG_S x26, PT_S10(sp)
39	REG_S x27, PT_S11(sp)
40	REG_S x28, PT_T3(sp)
41	REG_S x29, PT_T4(sp)
42	REG_S x30, PT_T5(sp)
43	REG_S x31, PT_T6(sp)
44	.endm
45
46	.macro restore_all_base_regs
47	REG_L x3,  PT_GP(sp)
48	REG_L x4,  PT_TP(sp)
49	REG_L x5,  PT_T0(sp)
50	REG_L x6,  PT_T1(sp)
51	REG_L x7,  PT_T2(sp)
52	REG_L x8,  PT_S0(sp)
53	REG_L x9,  PT_S1(sp)
54	REG_L x10, PT_A0(sp)
55	REG_L x11, PT_A1(sp)
56	REG_L x12, PT_A2(sp)
57	REG_L x13, PT_A3(sp)
58	REG_L x14, PT_A4(sp)
59	REG_L x15, PT_A5(sp)
60	REG_L x16, PT_A6(sp)
61	REG_L x17, PT_A7(sp)
62	REG_L x18, PT_S2(sp)
63	REG_L x19, PT_S3(sp)
64	REG_L x20, PT_S4(sp)
65	REG_L x21, PT_S5(sp)
66	REG_L x22, PT_S6(sp)
67	REG_L x23, PT_S7(sp)
68	REG_L x24, PT_S8(sp)
69	REG_L x25, PT_S9(sp)
70	REG_L x26, PT_S10(sp)
71	REG_L x27, PT_S11(sp)
72	REG_L x28, PT_T3(sp)
73	REG_L x29, PT_T4(sp)
74	REG_L x30, PT_T5(sp)
75	REG_L x31, PT_T6(sp)
76	.endm
77
78SYM_CODE_START(arch_rethook_trampoline)
79	addi sp, sp, -(PT_SIZE_ON_STACK)
80	save_all_base_regs
81
82	move a0, sp /* pt_regs */
83
84	call arch_rethook_trampoline_callback
85
86	/* use the result as the return-address */
87	move ra, a0
88
89	restore_all_base_regs
90	addi sp, sp, PT_SIZE_ON_STACK
91
92	ret
93SYM_CODE_END(arch_rethook_trampoline)
94