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
|
/****************************************************************************
* Assembly testing and benchmarking tool
* Copyright (c) 2015 Martin Storsjo
* Copyright (c) 2015 Janne Grunau
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Libav 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*****************************************************************************/
#include "libavutil/arm/asm.S"
/* override fpu so that NEON instructions are rejected */
#if HAVE_VFP
.fpu vfp
ELF .eabi_attribute 10, 0 @ suppress Tag_FP_arch
#endif
const register_init, align=3
.quad 0x21f86d66c8ca00ce
.quad 0x75b6ba21077c48ad
.quad 0xed56bb2dcb3c7736
.quad 0x8bda43d3fd1a7e06
.quad 0xb64a9c9e5d318408
.quad 0xdf9a54b303f1d3a3
.quad 0x4a75479abd64e097
.quad 0x249214109d5d1c88
endconst
const error_message_fpscr
.asciz "failed to preserve register FPSCR"
error_message_gpr:
.asciz "failed to preserve register r%d"
error_message_vfp:
.asciz "failed to preserve register d%d"
endconst
@ max number of args used by any asm function.
#define MAX_ARGS 15
#define ARG_STACK 4*(MAX_ARGS - 2)
@ align the used stack space to 8 to preserve the stack alignment
#define ARG_STACK_A (((ARG_STACK + pushed + 7) & ~7) - pushed)
.macro clobbercheck variant
.equ pushed, 4*9
function checkasm_checked_call_\variant, export=1
push {r4-r11, lr}
.ifc \variant, vfp
vpush {d8-d15}
fmrx r4, FPSCR
push {r4}
.equ pushed, pushed + 16*4 + 4
.endif
movrel r12, register_init
.ifc \variant, vfp
vldm r12, {d8-d15}
.endif
ldm r12, {r4-r11}
sub sp, sp, #ARG_STACK_A
.equ pos, 0
.rept MAX_ARGS-2
ldr r12, [sp, #ARG_STACK_A + pushed + 8 + pos]
str r12, [sp, #pos]
.equ pos, pos + 4
.endr
mov r12, r0
mov r0, r2
mov r1, r3
ldrd r2, r3, [sp, #ARG_STACK_A + pushed]
blx r12
add sp, sp, #ARG_STACK_A
push {r0, r1}
movrel r12, register_init
.ifc \variant, vfp
.macro check_reg_vfp, dreg, offset
ldrd r2, r3, [r12, #8 * (\offset)]
vmov r0, lr, \dreg
eor r2, r2, r0
eor r3, r3, lr
orrs r2, r2, r3
bne 4f
.endm
.irp n, 8, 9, 10, 11, 12, 13, 14, 15
@ keep track of the checked double/SIMD register
mov r1, #\n
check_reg_vfp d\n, \n-8
.endr
.purgem check_reg_vfp
fmrx r0, FPSCR
ldr r3, [sp, #8]
eor r0, r0, r3
@ Ignore changes in the topmost 5 bits
lsls r0, r0, #5
bne 3f
.endif
@ keep track of the checked GPR
mov r1, #4
.macro check_reg reg1, reg2=
ldrd r2, r3, [r12], #8
eors r2, r2, \reg1
bne 2f
add r1, r1, #1
.ifnb \reg2
eors r3, r3, \reg2
bne 2f
.endif
add r1, r1, #1
.endm
check_reg r4, r5
check_reg r6, r7
@ r9 is a volatile register in the ios ABI
#ifdef __APPLE__
check_reg r8
#else
check_reg r8, r9
#endif
check_reg r10, r11
.purgem check_reg
b 0f
4:
movrel r0, error_message_vfp
b 1f
3:
movrel r0, error_message_fpscr
b 1f
2:
movrel r0, error_message_gpr
1:
blx X(checkasm_fail_func)
0:
pop {r0, r1}
.ifc \variant, vfp
pop {r2}
fmxr FPSCR, r2
vpop {d8-d15}
.endif
pop {r4-r11, pc}
endfunc
.endm
#if HAVE_VFP || HAVE_NEON
clobbercheck vfp
#endif
clobbercheck novfp
|