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- doc: added disassembly examples for many platforms and calling conventions, for reference
author Tassilo Philipp
date Fri, 22 Nov 2019 23:08:59 +0100
parents
children fb51dc714566
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327
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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1 ; #include <stdlib.h>
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2 ;
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3 ; void leaf_call(int b, int c, int d, int e, int f, int g, int h)
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4 ; {
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5 ; }
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6 ;
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7 ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h)
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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8 ; {
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9 ; /* use some local data */
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10 ; *(char*)alloca(10) = 'L';
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11 ; leaf_call(b, c, d, e, f, g, h);
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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12 ; }
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13 ;
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14 ; int main()
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15 ; {
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16 ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7);
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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17 ; return 0;
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18 ; }
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19
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20
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21
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22 ; output from freebsd-12.0-x64 w/ clang 6.0.1
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23
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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24 0000000000000000 <leaf_call>:
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25 0: 55 push %rbp
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26 1: 48 89 e5 mov %rsp,%rbp
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27 4: 8b 45 10 mov 0x10(%rbp),%eax
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28 7: 89 7d fc mov %edi,-0x4(%rbp)
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29 a: 89 75 f8 mov %esi,-0x8(%rbp)
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30 d: 89 55 f4 mov %edx,-0xc(%rbp)
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31 10: 89 4d f0 mov %ecx,-0x10(%rbp)
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32 13: 44 89 45 ec mov %r8d,-0x14(%rbp)
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33 17: 44 89 4d e8 mov %r9d,-0x18(%rbp)
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34 1b: 89 45 e4 mov %eax,-0x1c(%rbp)
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35 1e: 5d pop %rbp
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36 1f: c3 retq
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37
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38 0000000000000020 <nonleaf_call>:
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39 20: 55 push %rbp ; |
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40 21: 48 89 e5 mov %rsp,%rbp ; | prolog
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41 24: 48 83 ec 40 sub $0x40,%rsp ; | open frame *with* static alloca() size included
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42 28: 8b 45 18 mov 0x18(%rbp),%eax ; unsure... get stack param from prev frame into some scratch reg... but why? see below @@@
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43 2b: 44 8b 55 10 mov 0x10(%rbp),%r10d ; unsure... get stack param from prev frame into some scratch reg... but why? see below @@@
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44 2f: 89 7d fc mov %edi,-0x4(%rbp) ; in arg 0 -> local area (as temp store)
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45 32: 89 75 f8 mov %esi,-0x8(%rbp) ; in arg 1 -> local area (as temp store)
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46 35: 89 55 f4 mov %edx,-0xc(%rbp) ; in arg 2 -> local area (as temp store)
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47 38: 89 4d f0 mov %ecx,-0x10(%rbp) ; in arg 3 -> local area (as temp store)
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48 3b: 44 89 45 ec mov %r8d,-0x14(%rbp) ; in arg 4 -> local area (as temp store)
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49 3f: 44 89 4d e8 mov %r9d,-0x18(%rbp) ; in arg 5 -> local area (as temp store)
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50 43: c6 45 d0 4c movb $0x4c,-0x30(%rbp) ; 'L' -> local area (of alloca()'d space)
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51 47: 8b 7d f8 mov -0x8(%rbp),%edi ; arg 0
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52 4a: 8b 75 f4 mov -0xc(%rbp),%esi ; arg 1
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53 4d: 8b 55 f0 mov -0x10(%rbp),%edx ; arg 2
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54 50: 8b 4d ec mov -0x14(%rbp),%ecx ; arg 3
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55 53: 44 8b 45 e8 mov -0x18(%rbp),%r8d ; arg 4
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56 57: 44 8b 4d 10 mov 0x10(%rbp),%r9d ; arg 5 (fetched from prev frame's param area - behind return addr on 16b aligned stack)
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57 5b: 44 8b 5d 18 mov 0x18(%rbp),%r11d ; arg 6 (fetched from prev frame's param area), and ...
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58 5f: 44 89 1c 24 mov %r11d,(%rsp) ; ... "pushed" onto stack
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59 63: 44 89 55 cc mov %r10d,-0x34(%rbp) ; unsure... write something to local area @@@?
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60 67: 89 45 c8 mov %eax,-0x38(%rbp) ; unsure... write something to local area @@@?
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61 6a: e8 91 ff ff ff callq 0 <leaf_call> ; push return addr and call
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62 6f: 48 83 c4 40 add $0x40,%rsp ; |
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63 73: 5d pop %rbp ; | epilog
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64 74: c3 retq ; |
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65 75: 66 66 2e 0f 1f 84 00 nopw %cs:0x0(%rax,%rax,1) ; garbage data
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66 7c: 00 00 00 00 ; garbage data
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67
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68 0000000000000080 <main>:
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69 80: 55 push %rbp ; |
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70 81: 48 89 e5 mov %rsp,%rbp ; | prolog
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71 84: 48 83 ec 20 sub $0x20,%rsp ; |
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72 88: 31 ff xor %edi,%edi ; arg 0
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73 8a: be 01 00 00 00 mov $0x1,%esi ; arg 1
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74 8f: ba 02 00 00 00 mov $0x2,%edx ; arg 2
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75 94: b9 03 00 00 00 mov $0x3,%ecx ; arg 3
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76 99: 41 b8 04 00 00 00 mov $0x4,%r8d ; arg 4
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77 9f: 41 b9 05 00 00 00 mov $0x5,%r9d ; arg 5
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78 a5: b8 06 00 00 00 mov $0x6,%eax ; unsure... see below @@@?
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79 aa: 41 ba 07 00 00 00 mov $0x7,%r10d ; unsure... see below @@@?
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80 b0: c7 45 fc 00 00 00 00 movl $0x0,-0x4(%rbp) ; unsure... write 0 to local area @@@?
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81 b7: c7 04 24 06 00 00 00 movl $0x6,(%rsp) ; "push" arg6 onto stack
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82 be: c7 44 24 08 07 00 00 00 movl $0x7,0x8(%rsp) ; "push" arg7 onto stack
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83 c6: 44 89 55 f8 mov %r10d,-0x8(%rbp) ; unsure... write something to local area @@@?
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84 ca: 89 45 f4 mov %eax,-0xc(%rbp) ; unsure... write something to local area @@@?
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85 cd: e8 4e ff ff ff callq 20 <nonleaf_call> ; push return addr and call
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86 d2: 31 c0 xor %eax,%eax ; return value
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87 d4: 48 83 c4 20 add $0x20,%rsp ; |
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88 d8: 5d pop %rbp ; | epilog
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89 d9: c3 retq ; |
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90
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91
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92
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93 ; output from arch_linux-2011.08.19-x64 w/ gcc 4.6.1 (w/ alloca(220) instead of 10)
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94
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95 0000000000000000 <leaf_call>:
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96 0: 55 push %rbp
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97 1: 48 89 e5 mov %rsp,%rbp
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98 4: 89 7d fc mov %edi,-0x4(%rbp)
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99 7: 89 75 f8 mov %esi,-0x8(%rbp)
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100 a: 89 55 f4 mov %edx,-0xc(%rbp)
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101 d: 89 4d f0 mov %ecx,-0x10(%rbp)
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102 10: 44 89 45 ec mov %r8d,-0x14(%rbp)
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103 14: 44 89 4d e8 mov %r9d,-0x18(%rbp)
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104 18: 5d pop %rbp
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105 19: c3 retq
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106
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107 000000000000001a <nonleaf_call>:
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108 1a: 55 push %rbp
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109 1b: 48 89 e5 mov %rsp,%rbp
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110 1e: 48 83 ec 30 sub $0x30,%rsp
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111 22: 89 7d fc mov %edi,-0x4(%rbp)
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112 25: 89 75 f8 mov %esi,-0x8(%rbp)
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113 28: 89 55 f4 mov %edx,-0xc(%rbp)
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114 2b: 89 4d f0 mov %ecx,-0x10(%rbp)
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115 2e: 44 89 45 ec mov %r8d,-0x14(%rbp)
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116 32: 44 89 4d e8 mov %r9d,-0x18(%rbp)
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117 36: b8 10 00 00 00 mov $0x10,%eax
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118 3b: 48 83 e8 01 sub $0x1,%rax
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119 3f: 48 05 eb 00 00 00 add $0xeb,%rax
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120 45: 48 c7 45 e0 10 00 00 00 movq $0x10,-0x20(%rbp)
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121 4d: ba 00 00 00 00 mov $0x0,%edx
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122 52: 48 f7 75 e0 divq -0x20(%rbp)
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123 56: 48 6b c0 10 imul $0x10,%rax,%rax
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124 5a: 48 29 c4 sub %rax,%rsp
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125 5d: 48 8d 44 24 08 lea 0x8(%rsp),%rax
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126 62: 48 83 c0 0f add $0xf,%rax
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127 66: 48 c1 e8 04 shr $0x4,%rax
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128 6a: 48 c1 e0 04 shl $0x4,%rax
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129 6e: c6 00 4c movb $0x4c,(%rax)
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130 71: 44 8b 45 e8 mov -0x18(%rbp),%r8d
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131 75: 8b 4d ec mov -0x14(%rbp),%ecx
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132 78: 8b 55 f0 mov -0x10(%rbp),%edx
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133 7b: 8b 75 f4 mov -0xc(%rbp),%esi
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134 7e: 8b 45 f8 mov -0x8(%rbp),%eax
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135 81: 8b 7d 18 mov 0x18(%rbp),%edi
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136 84: 89 3c 24 mov %edi,(%rsp)
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137 87: 44 8b 4d 10 mov 0x10(%rbp),%r9d
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138 8b: 89 c7 mov %eax,%edi
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139 8d: e8 00 00 00 00 callq 92 <nonleaf_call+0x78>
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140 92: c9 leaveq
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141 93: c3 retq
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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142
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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143 0000000000000094 <main>:
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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144 94: 55 push %rbp
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145 95: 48 89 e5 mov %rsp,%rbp
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146 98: 48 83 ec 10 sub $0x10,%rsp
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147 9c: c7 44 24 08 07 00 00 00 movl $0x7,0x8(%rsp)
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148 a4: c7 04 24 06 00 00 00 movl $0x6,(%rsp)
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149 ab: 41 b9 05 00 00 00 mov $0x5,%r9d
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150 b1: 41 b8 04 00 00 00 mov $0x4,%r8d
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151 b7: b9 03 00 00 00 mov $0x3,%ecx
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152 bc: ba 02 00 00 00 mov $0x2,%edx
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153 c1: be 01 00 00 00 mov $0x1,%esi
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154 c6: bf 00 00 00 00 mov $0x0,%edi
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155 cb: e8 00 00 00 00 callq d0 <main+0x3c>
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156 d0: b8 00 00 00 00 mov $0x0,%eax
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157 d5: c9 leaveq
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158 d6: c3 retq
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159
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160 ; vim: ft=asm
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161