Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
Download
52867 views
Tweet
Share
Share
1
/****************************************************************************

2
 * checkasm-arm.S: assembly check tool

3
 *****************************************************************************

4
 * Copyright (C) 2015-2016 x264 project

5
 *

6
 * Authors: Martin Storsjo <[email protected]>

7
 *

8
 * This program is free software; you can redistribute it and/or modify

9
 * it under the terms of the GNU General Public License as published by

10
 * the Free Software Foundation; either version 2 of the License, or

11
 * (at your option) any later version.

12
 *

13
 * This program is distributed in the hope that it will be useful,

14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

16
 * GNU General Public License for more details.

17
 *

18
 * You should have received a copy of the GNU General Public License

19
 * along with this program; if not, write to the Free Software

20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.

21
 *

22
 * This program is also available under a commercial proprietary license.

23
 * For more information, contact us at [email protected].

24
 *****************************************************************************/

25


26
#include "../common/arm/asm.S"

27


28
.section .rodata

29
.align 4

30
register_init:

31
.quad 0x21f86d66c8ca00ce

32
.quad 0x75b6ba21077c48ad

33
.quad 0xed56bb2dcb3c7736

34
.quad 0x8bda43d3fd1a7e06

35
.quad 0xb64a9c9e5d318408

36
.quad 0xdf9a54b303f1d3a3

37
.quad 0x4a75479abd64e097

38
.quad 0x249214109d5d1c88

39


40
error_message:

41
.asciz "failed to preserve register"

42


43
.text

44


45
@ max number of args used by any x264 asm function.

46
#define MAX_ARGS 15

47


48
#define ARG_STACK 4*(MAX_ARGS - 2)

49


50
.macro clobbercheck variant

51
.equ pushed, 4*10

52
function x264_checkasm_call_\variant

53
    push        {r4-r11, lr}

54
.ifc \variant, neon

55
    vpush       {q4-q7}

56
.equ pushed, pushed + 16*4

57
.endif

58


59
    movrel      r12, register_init

60
.ifc \variant, neon

61
    vldm        r12, {q4-q7}

62
.endif

63
    ldm         r12, {r4-r11}

64


65
    push        {r1}

66


67
    sub         sp,  sp,  #ARG_STACK

68
.equ pos, 0

69
.rept MAX_ARGS-2

70
    ldr         r12, [sp, #ARG_STACK + pushed + 8 + pos]

71
    str         r12, [sp, #pos]

72
.equ pos, pos + 4

73
.endr

74


75
    mov         r12, r0

76
    mov         r0,  r2

77
    mov         r1,  r3

78
    ldrd        r2,  r3,  [sp, #ARG_STACK + pushed]

79
    blx         r12

80
    add         sp,  sp,  #ARG_STACK

81
    pop         {r2}

82


83
    push        {r0, r1}

84
    movrel      r12, register_init

85
.ifc \variant, neon

86
    vldm        r12, {q0-q3}

87
    veor        q0,  q0,  q4

88
    veor        q1,  q1,  q5

89
    veor        q2,  q2,  q6

90
    veor        q3,  q3,  q7

91
    vorr        q0,  q0,  q1

92
    vorr        q0,  q0,  q2

93
    vorr        q0,  q0,  q3

94
    vorr        d0,  d0,  d1

95
    vrev64.32   d1,  d0

96
    vorr        d0,  d0,  d1

97
    vmov.32     r3,  d0[0]

98
.else

99
    mov         r3,  #0

100
.endif

101


102
.macro check_reg reg1, reg2=

103
    ldrd        r0,  r1,  [r12], #8

104
    eor         r0,  r0, \reg1

105
    orr         r3,  r3, r0

106
.ifnb \reg2

107
    eor         r1,  r1, \reg2

108
    orr         r3,  r3, r1

109
.endif

110
.endm

111
    check_reg   r4,  r5

112
    check_reg   r6,  r7

113
@ r9 is a volatile register in the ios ABI

114
#if SYS_MACOSX

115
    check_reg   r8

116
#else

117
    check_reg   r8,  r9

118
#endif

119
    check_reg   r10, r11

120
.purgem check_reg

121


122
    cmp         r3,  #0

123
    beq         0f

124


125
    mov         r12, #0

126
    str         r12, [r2]

127
    movrel      r0, error_message

128
    blx         X(puts)

129
0:

130
    pop         {r0, r1}

131
.ifc \variant, neon

132
    vpop        {q4-q7}

133
.endif

134
    pop         {r4-r11, pc}

135
endfunc

136
.endm

137


138
clobbercheck neon

139
clobbercheck noneon

140


141