1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* Record the register state before and after a variant PCS call.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
.variant_pcs vpcs_call
.global vpcs_call
.type vpcs_call, %function
vpcs_call:
.cfi_startproc
hint 34 /* bti c. */
/* Save register state to *x0. */
stp x0, x1, [x0]
stp x2, x3, [x0, 16]
stp x4, x5, [x0, 32]
stp x6, x7, [x0, 48]
stp x8, x9, [x0, 64]
stp x10, x11, [x0, 80]
stp x12, x13, [x0, 96]
stp x14, x15, [x0, 112]
stp x16, x17, [x0, 128]
stp x18, x19, [x0, 144]
stp x20, x21, [x0, 160]
stp x22, x23, [x0, 176]
stp x24, x25, [x0, 192]
stp x26, x27, [x0, 208]
stp x28, x29, [x0, 224]
mov x1, sp
stp x30, x1, [x0, 240]
stp q0, q1, [x0, 256]
stp q2, q3, [x0, 288]
stp q4, q5, [x0, 320]
stp q6, q7, [x0, 352]
stp q8, q9, [x0, 384]
stp q10, q11, [x0, 416]
stp q12, q13, [x0, 448]
stp q14, q15, [x0, 480]
stp q16, q17, [x0, 512]
stp q18, q19, [x0, 544]
stp q20, q21, [x0, 576]
stp q22, q23, [x0, 608]
stp q24, q25, [x0, 640]
stp q26, q27, [x0, 672]
stp q28, q29, [x0, 704]
stp q30, q31, [x0, 736]
ret
.cfi_endproc
.size vpcs_call, .-vpcs_call
.global vpcs_call_regs
.type vpcs_call_regs, %function
vpcs_call_regs:
.cfi_startproc
hint 34 /* bti c. */
stp x29, x30, [sp, -160]!
mov x29, sp
/* Save callee-saved registers. */
stp x19, x20, [sp, 16]
stp x21, x22, [sp, 32]
stp x23, x24, [sp, 48]
stp x25, x26, [sp, 64]
stp x27, x28, [sp, 80]
stp d8, d9, [sp, 96]
stp d10, d11, [sp, 112]
stp d12, d13, [sp, 128]
stp d14, d15, [sp, 144]
/* Initialize most registers from *x1, and save x0, x1, x29, x30,
and sp (== x29), so *x1 contains the register state. */
stp x0, x1, [x1]
str x29, [x1, 232]
ldp x2, x3, [x1, 16]
ldp x4, x5, [x1, 32]
ldp x6, x7, [x1, 48]
ldp x8, x9, [x1, 64]
ldp x10, x11, [x1, 80]
ldp x12, x13, [x1, 96]
ldp x14, x15, [x1, 112]
ldp x16, x17, [x1, 128]
ldp x18, x19, [x1, 144]
ldp x20, x21, [x1, 160]
ldp x22, x23, [x1, 176]
ldp x24, x25, [x1, 192]
ldp x26, x27, [x1, 208]
ldr x28, [x1, 224]
/* Skip x29, x30, sp. */
ldp q0, q1, [x1, 256]
ldp q2, q3, [x1, 288]
ldp q4, q5, [x1, 320]
ldp q6, q7, [x1, 352]
ldp q8, q9, [x1, 384]
ldp q10, q11, [x1, 416]
ldp q12, q13, [x1, 448]
ldp q14, q15, [x1, 480]
ldp q16, q17, [x1, 512]
ldp q18, q19, [x1, 544]
ldp q20, q21, [x1, 576]
ldp q22, q23, [x1, 608]
ldp q24, q25, [x1, 640]
ldp q26, q27, [x1, 672]
ldp q28, q29, [x1, 704]
ldp q30, q31, [x1, 736]
/* Emulate a BL using B, but save x30 before the branch. */
adr x30, .L_return_addr
stp x30, x29, [x1, 240]
b vpcs_call
.L_return_addr:
/* Restore callee-saved registers. */
ldp x19, x20, [sp, 16]
ldp x21, x22, [sp, 32]
ldp x23, x24, [sp, 48]
ldp x25, x26, [sp, 64]
ldp x27, x28, [sp, 80]
ldp d8, d9, [sp, 96]
ldp d10, d11, [sp, 112]
ldp d12, d13, [sp, 128]
ldp d14, d15, [sp, 144]
ldp x29, x30, [sp], 160
ret
.cfi_endproc
.size vpcs_call_regs, .-vpcs_call_regs
|
