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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
#!/usr/bin/env perl
# Copyright (c) 2019, Google Inc.
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
# This file defines helper functions for crypto/test/abi_test.h on aarch64. See
# that header for details on how to use this.
#
# For convenience, this file is linked into libcrypto, where consuming builds
# already support architecture-specific sources. The static linker should drop
# this code in non-test binaries. This includes a shared library build of
# libcrypto, provided --gc-sections (ELF), -dead_strip (iOS), or equivalent is
# used.
#
# References:
#
# AAPCS64: http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
# iOS ARM64: https://developer.apple.com/library/archive/documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARM64FunctionCallingConventions.html
use strict;
my $flavour = shift;
my $output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
$0 =~ m/(.*[\/\\])[^\/\\]+$/;
my $dir = $1;
my $xlate;
( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/arm-xlate.pl" and -f $xlate) or
die "can't locate arm-xlate.pl";
open OUT, "| \"$^X\" \"$xlate\" $flavour \"$output\"";
*STDOUT = *OUT;
my ($func, $state, $argv, $argc) = ("x0", "x1", "x2", "x3");
my $code = <<____;
.text
// abi_test_trampoline loads callee-saved registers from |state|, calls |func|
// with |argv|, then saves the callee-saved registers into |state|. It returns
// the result of |func|. The |unwind| argument is unused.
// uint64_t abi_test_trampoline(void (*func)(...), CallerState *state,
// const uint64_t *argv, size_t argc,
// uint64_t unwind);
.type abi_test_trampoline, %function
.globl abi_test_trampoline
.align 4
abi_test_trampoline:
.Labi_test_trampoline_begin:
// Stack layout (low to high addresses)
// x29,x30 (16 bytes)
// d8-d15 (64 bytes)
// x19-x28 (80 bytes)
// $state (8 bytes)
// padding (8 bytes)
stp x29, x30, [sp, #-176]!
mov x29, sp
// Saved callee-saved registers and |state|.
stp d8, d9, [sp, #16]
stp d10, d11, [sp, #32]
stp d12, d13, [sp, #48]
stp d14, d15, [sp, #64]
stp x19, x20, [sp, #80]
stp x21, x22, [sp, #96]
stp x23, x24, [sp, #112]
stp x25, x26, [sp, #128]
stp x27, x28, [sp, #144]
str $state, [sp, #160]
// Load registers from |state|, with the exception of x29. x29 is the
// frame pointer and also callee-saved, but AAPCS64 allows platforms to
// mandate that x29 always point to a frame. iOS64 does so, which means
// we cannot fill x29 with entropy without violating ABI rules
// ourselves. x29 is tested separately below.
ldp d8, d9, [$state], #16
ldp d10, d11, [$state], #16
ldp d12, d13, [$state], #16
ldp d14, d15, [$state], #16
ldp x19, x20, [$state], #16
ldp x21, x22, [$state], #16
ldp x23, x24, [$state], #16
ldp x25, x26, [$state], #16
ldp x27, x28, [$state], #16
// Move parameters into temporary registers.
mov x9, $func
mov x10, $argv
mov x11, $argc
// Load parameters into registers.
cbz x11, .Largs_done
ldr x0, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x1, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x2, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x3, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x4, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x5, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x6, [x10], #8
subs x11, x11, #1
b.eq .Largs_done
ldr x7, [x10], #8
.Largs_done:
blr x9
// Reload |state| and store registers.
ldr $state, [sp, #160]
stp d8, d9, [$state], #16
stp d10, d11, [$state], #16
stp d12, d13, [$state], #16
stp d14, d15, [$state], #16
stp x19, x20, [$state], #16
stp x21, x22, [$state], #16
stp x23, x24, [$state], #16
stp x25, x26, [$state], #16
stp x27, x28, [$state], #16
// |func| is required to preserve x29, the frame pointer. We cannot load
// random values into x29 (see comment above), so compare it against the
// expected value and zero the field of |state| if corrupted.
mov x9, sp
cmp x29, x9
b.eq .Lx29_ok
str xzr, [$state]
.Lx29_ok:
// Restore callee-saved registers.
ldp d8, d9, [sp, #16]
ldp d10, d11, [sp, #32]
ldp d12, d13, [sp, #48]
ldp d14, d15, [sp, #64]
ldp x19, x20, [sp, #80]
ldp x21, x22, [sp, #96]
ldp x23, x24, [sp, #112]
ldp x25, x26, [sp, #128]
ldp x27, x28, [sp, #144]
ldp x29, x30, [sp], #176
ret
.size abi_test_trampoline,.-abi_test_trampoline
____
# abi_test_clobber_* zeros the corresponding register. These are used to test
# the ABI-testing framework.
foreach (0..29) {
# x18 is the platform register and off limits.
next if ($_ == 18);
$code .= <<____;
.type abi_test_clobber_x$_, %function
.globl abi_test_clobber_x$_
.align 4
abi_test_clobber_x$_:
mov x$_, xzr
ret
.size abi_test_clobber_x$_,.-abi_test_clobber_x$_
____
}
foreach (0..31) {
$code .= <<____;
.type abi_test_clobber_d$_, %function
.globl abi_test_clobber_d$_
.align 4
abi_test_clobber_d$_:
fmov d$_, xzr
ret
.size abi_test_clobber_d$_,.-abi_test_clobber_d$_
____
}
# abi_test_clobber_v*_upper clobbers only the upper half of v*. AAPCS64 only
# requires the lower half (d*) be preserved.
foreach (8..15) {
$code .= <<____;
.type abi_test_clobber_v${_}_upper, %function
.globl abi_test_clobber_v${_}_upper
.align 4
abi_test_clobber_v${_}_upper:
fmov v${_}.d[1], xzr
ret
.size abi_test_clobber_v${_}_upper,.-abi_test_clobber_v${_}_upper
____
}
print $code;
close STDOUT;
|