xref: /haiku/src/system/kernel/arch/riscv64/arch_asm.S (revision 4c8e85b316c35a9161f5a1c50ad70bc91c83a76f) 
1/*
2 * Copyright 2019-2021, Haiku, Inc. All Rights Reserved
3 * Distributed under the terms of the MIT License.
4 */
5
6
7#include <asm_defs.h>
8#include "syscall_numbers.h"
9
10
11.text
12
13
14FUNCTION(MSyscall):
15	ecall
16	ret
17FUNCTION_END(MSyscall)
18
19
20FUNCTION(arch_context_switch):
21# save `from` context
22	sd ra,   0*8(a0)
23	sd s0,   1*8(a0)
24	sd s1,   2*8(a0)
25	sd s2,   3*8(a0)
26	sd s3,   4*8(a0)
27	sd s4,   5*8(a0)
28	sd s5,   6*8(a0)
29	sd s6,   7*8(a0)
30	sd s7,   8*8(a0)
31	sd s8,   9*8(a0)
32	sd s9,  10*8(a0)
33	sd s10, 11*8(a0)
34	sd s11, 12*8(a0)
35	sd sp,  13*8(a0)
36	csrr t0, satp
37	sd t0,  14*8(a0)
38
39# load `to` context
40	ld ra,   0*8(a1)
41	ld s0,   1*8(a1)
42	ld s1,   2*8(a1)
43	ld s2,   3*8(a1)
44	ld s3,   4*8(a1)
45	ld s4,   5*8(a1)
46	ld s5,   6*8(a1)
47	ld s6,   7*8(a1)
48	ld s7,   8*8(a1)
49	ld s8,   9*8(a1)
50	ld s9,  10*8(a1)
51	ld s10, 11*8(a1)
52	ld s11, 12*8(a1)
53	ld sp,  13*8(a1)
54	ld t0,  14*8(a1)
55	csrw satp, t0
56	sfence.vma
57
58	ret
59FUNCTION_END(arch_context_switch)
60
61
62FUNCTION(save_fpu):
63	fsd f0,   0*8(a0)
64	fsd f1,   1*8(a0)
65	fsd f2,   2*8(a0)
66	fsd f3,   3*8(a0)
67	fsd f4,   4*8(a0)
68	fsd f5,   5*8(a0)
69	fsd f6,   6*8(a0)
70	fsd f7,   7*8(a0)
71	fsd f8,   8*8(a0)
72	fsd f9,   9*8(a0)
73	fsd f10, 10*8(a0)
74	fsd f11, 11*8(a0)
75	fsd f12, 12*8(a0)
76	fsd f13, 13*8(a0)
77	fsd f14, 14*8(a0)
78	fsd f15, 15*8(a0)
79	fsd f16, 16*8(a0)
80	fsd f17, 17*8(a0)
81	fsd f18, 18*8(a0)
82	fsd f19, 19*8(a0)
83	fsd f20, 20*8(a0)
84	fsd f21, 21*8(a0)
85	fsd f22, 22*8(a0)
86	fsd f23, 23*8(a0)
87	fsd f24, 24*8(a0)
88	fsd f25, 25*8(a0)
89	fsd f26, 26*8(a0)
90	fsd f27, 27*8(a0)
91	fsd f28, 28*8(a0)
92	fsd f29, 29*8(a0)
93	fsd f30, 30*8(a0)
94	fsd f31, 31*8(a0)
95	frcsr t0
96	sd  t0,  32*8(a0)
97
98	ret
99FUNCTION_END(save_fpu)
100
101
102FUNCTION(restore_fpu):
103	fld f0,   0*8(a0)
104	fld f1,   1*8(a0)
105	fld f2,   2*8(a0)
106	fld f3,   3*8(a0)
107	fld f4,   4*8(a0)
108	fld f5,   5*8(a0)
109	fld f6,   6*8(a0)
110	fld f7,   7*8(a0)
111	fld f8,   8*8(a0)
112	fld f9,   9*8(a0)
113	fld f10, 10*8(a0)
114	fld f11, 11*8(a0)
115	fld f12, 12*8(a0)
116	fld f13, 13*8(a0)
117	fld f14, 14*8(a0)
118	fld f15, 15*8(a0)
119	fld f16, 16*8(a0)
120	fld f17, 17*8(a0)
121	fld f18, 18*8(a0)
122	fld f19, 19*8(a0)
123	fld f20, 20*8(a0)
124	fld f21, 21*8(a0)
125	fld f22, 22*8(a0)
126	fld f23, 23*8(a0)
127	fld f24, 24*8(a0)
128	fld f25, 25*8(a0)
129	fld f26, 26*8(a0)
130	fld f27, 27*8(a0)
131	fld f28, 28*8(a0)
132	fld f29, 29*8(a0)
133	fld f30, 30*8(a0)
134	fld f31, 31*8(a0)
135	ld  t0,  32*8(a0)
136	fscsr t0
137
138	ret
139FUNCTION_END(restore_fpu)
140
141
142FUNCTION(arch_thread_entry):
143	mv a0, s2
144	jr s1
145FUNCTION_END(arch_thread_entry)
146
147
148FUNCTION(arch_load_user_iframe):
149	mv fp, a0
150	mv sp, a1
151	tail SVecURet
152FUNCTION_END(arch_load_user_iframe)
153
154
155FUNCTION(arch_user_thread_exit):
156	li t0, SYSCALL_EXIT_THREAD
157	ecall
158	ret
159FUNCTION_END(arch_user_thread_exit)
160