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annotate doc/disas_examples/x64.win.disas @ 468:79b95db3d68f

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- added (only partly annotated) x64/win64 disas examples
author Tassilo Philipp
date Sun, 06 Feb 2022 17:22:59 +0100
parents c0390dc85a07
children 75cb8f79d725
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1 ; void leaf_call(int b, int c, int d, int e, int f, int g, int h)
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2 ; {
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3 ; }
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4 ;
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5 ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h)
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6 ; {
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7 ; /* use some local data */
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8 ; char x[10] = { 'L' };
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9 ; leaf_call(b, c, d, e, f, g, h);
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10 ; }
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11 ;
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12 ; int main()
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13 ; {
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14 ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7);
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15 ; return 0;
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16 ; }
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17
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18
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19
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20 ; output from godbolt compiler explorer w/ msvc 19.0
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21
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22 leaf_call PROC
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23 mov DWORD PTR [rsp+32], r9d
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24 mov DWORD PTR [rsp+24], r8d
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25 mov DWORD PTR [rsp+16], edx
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26 mov DWORD PTR [rsp+8], ecx
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27 ret 0
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28 leaf_call ENDP
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29
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30 x$ = 64
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31 b$ = 104
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32 c$ = 112
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33 d$ = 120
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34 e$ = 128
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35 f$ = 136
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36 g$ = 144
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37 h$ = 152
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38 nonleaf_call PROC
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39 mov DWORD PTR [rsp+32], r9d ; | |
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40 mov DWORD PTR [rsp+24], r8d ; | |
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41 mov DWORD PTR [rsp+16], edx ; | | spill
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42 mov DWORD PTR [rsp+8], ecx ; | |
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43 push rdi ; |
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44 sub rsp, 80 ; | prolog
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45 mov BYTE PTR x$[rsp], 76 ; 'L' -> local area (of local array's space)
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46 lea rax, QWORD PTR x$[rsp+1] ; |
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47 mov rdi, rax ; |
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48 xor eax, eax ; | zero-init rest of local array's space
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49 mov ecx, 9 ; |
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50 rep stosb ; |
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51 mov eax, DWORD PTR h$[rsp] ; arg 6 (fetched from caller's frame param area), and ...
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52 mov DWORD PTR [rsp+48], eax ; ... "pushed" onto stack
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53 mov eax, DWORD PTR g$[rsp] ; arg 5 (fetched from caller's frame param area), and ...
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54 mov DWORD PTR [rsp+40], eax ; ... "pushed" onto stack
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55 mov eax, DWORD PTR f$[rsp] ; arg 4 (fetched from caller's frame param area), and ...
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56 mov DWORD PTR [rsp+32], eax ; ... "pushed" onto stack
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57 mov r9d, DWORD PTR e$[rsp] ; arg 3
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58 mov r8d, DWORD PTR d$[rsp] ; arg 2
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59 mov edx, DWORD PTR c$[rsp] ; arg 1
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60 mov ecx, DWORD PTR b$[rsp] ; arg 0
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61 call leaf_call ; push return addr and call
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62 add rsp, 80 ; |
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63 pop rdi ; | epilog
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64 ret 0 ; |
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65 nonleaf_call ENDP
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66
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67 main PROC
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68 sub rsp, 72 ; prolog
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69 mov DWORD PTR [rsp+56], 7 ; "push" arg 7 onto stack
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70 mov DWORD PTR [rsp+48], 6 ; "push" arg 6 onto stack
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71 mov DWORD PTR [rsp+40], 5 ; "push" arg 5 onto stack
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72 mov DWORD PTR [rsp+32], 4 ; "push" arg 4 onto stack
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73 mov r9d, 3 ; arg 3
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74 mov r8d, 2 ; arg 2
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75 mov edx, 1 ; arg 1
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76 xor ecx, ecx ; arg 0
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77 call nonleaf_call ; push return addr and call
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78 xor eax, eax ; return value
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79 add rsp, 72 ; |
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80 ret 0 ; | epilog
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81 main ENDP
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82
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83
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84
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85 ; ---------- structs by value, struct in first call on reg arg boundary ---------->
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86 ;
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87 ; struct A { int i, j; long long l; };
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88 ;
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89 ; void leaf_call(int b, int c, int d, int e, struct A f, int g, int h)
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90 ; {
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91 ; }
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92 ;
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93 ; void nonleaf_call(int a, int b, int c, int d, int e, struct A f, int g, int h)
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94 ; {
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95 ; /* use some local data */
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96 ; char x[220] = { 'L' };
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97 ; leaf_call(b, c, d, e, f, g, h);
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98 ; }
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99 ;
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100 ; int main()
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101 ; {
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102 ; struct A a = {5, 6, 7ll};
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103 ; nonleaf_call(0, 1, 2, 3, 4, a, 8, 9);
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104 ; return 0;
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105 ; }
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106
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107
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108
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109 ; output from godbolt compiler explorer w/ msvc 19.0
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110
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111 leaf_call PROC
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112 mov DWORD PTR [rsp+32], r9d
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113 mov DWORD PTR [rsp+24], r8d
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114 mov DWORD PTR [rsp+16], edx
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115 mov DWORD PTR [rsp+8], ecx
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116 ret 0
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117 leaf_call ENDP
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118
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119 $T1 = 64
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120 x$ = 80
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121 b$ = 344
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122 c$ = 352
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123 d$ = 360
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124 e$ = 368
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125 f$ = 376
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126 g$ = 384
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127 h$ = 392
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128 nonleaf_call PROC
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129 mov DWORD PTR [rsp+32], r9d
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130 mov DWORD PTR [rsp+24], r8d
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131 mov DWORD PTR [rsp+16], edx
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132 mov DWORD PTR [rsp+8], ecx
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133 push rsi
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134 push rdi
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135 sub rsp, 312 ; 00000138H
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136 mov BYTE PTR x$[rsp], 76 ; 0000004cH
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137 lea rax, QWORD PTR x$[rsp+1]
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138 mov rdi, rax
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139 xor eax, eax
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140 mov ecx, 219 ; 000000dbH
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141 rep stosb
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142 lea rax, QWORD PTR $T1[rsp]
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143 mov rdi, rax
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144 mov rsi, QWORD PTR f$[rsp]
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145 mov ecx, 16
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146 rep movsb
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147 mov eax, DWORD PTR h$[rsp]
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148 mov DWORD PTR [rsp+48], eax
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149 mov eax, DWORD PTR g$[rsp]
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150 mov DWORD PTR [rsp+40], eax
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151 lea rax, QWORD PTR $T1[rsp]
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152 mov QWORD PTR [rsp+32], rax
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153 mov r9d, DWORD PTR e$[rsp]
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154 mov r8d, DWORD PTR d$[rsp]
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155 mov edx, DWORD PTR c$[rsp]
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156 mov ecx, DWORD PTR b$[rsp]
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157 call leaf_call
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158 add rsp, 312 ; 00000138H
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159 pop rdi
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160 pop rsi
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161 ret 0
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162 nonleaf_call ENDP
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163
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164 a$ = 64
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165 $T1 = 80
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166 main PROC
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167 push rsi
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168 push rdi
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169 sub rsp, 104 ; 00000068H
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170 mov DWORD PTR a$[rsp], 5
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171 mov DWORD PTR a$[rsp+4], 6
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172 mov QWORD PTR a$[rsp+8], 7
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173 lea rax, QWORD PTR $T1[rsp]
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174 lea rcx, QWORD PTR a$[rsp]
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175 mov rdi, rax
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176 mov rsi, rcx
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177 mov ecx, 16
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178 rep movsb
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179 mov DWORD PTR [rsp+56], 9
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180 mov DWORD PTR [rsp+48], 8
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181 lea rax, QWORD PTR $T1[rsp]
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182 mov QWORD PTR [rsp+40], rax
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183 mov DWORD PTR [rsp+32], 4
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184 mov r9d, 3
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185 mov r8d, 2
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186 mov edx, 1
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187 xor ecx, ecx
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188 call nonleaf_call
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189 xor eax, eax
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190 add rsp, 104 ; 00000068H
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191 pop rdi
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192 pop rsi
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193 ret 0
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194 main ENDP
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195
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196
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197
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198 ; ---------- structs by value, complex example (multiple structs, partly passed via regs) ---------->
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199 ;
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200 ; struct A { int i, j; float f; };
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201 ; struct B { double d; long long l; };
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202 ;
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203 ; void leaf_call(int b, struct A c, struct B d, int e, int f, struct A g, struct B h, int i, int j)
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204 ; {
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205 ; }
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206 ;
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207 ; void nonleaf_call(int a, int b, struct A c, struct B d, int e, int f, struct A g, struct B h, int i, int j)
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208 ; {
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209 ; /* use some local data */
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210 ; char x[220] = { 'L' };
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211 ; leaf_call(b, c, d, e, f, g, h, i, j);
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212 ; }
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213 ;
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214 ; int main()
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215 ; {
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216 ; struct A a = {2, 3, 4.f};
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217 ; struct B b = {5., 6ll};
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218 ; struct A c = {9, 10, 11.f};
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219 ; struct B d = {12., 13ll};
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220 ; nonleaf_call(0, 1, a, b, 7, 8, c, d, 14, 15);
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221 ; return 0;
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222 ; }
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223
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224
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225
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226 ; output from godbolt compiler explorer w/ msvc 19.0
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227
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228 __real@41300000 DD 041300000r ; |
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229 __real@40800000 DD 040800000r ; |
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230 __real@4028000000000000 DQ 04028000000000000r ; | fp data
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231 __real@4014000000000000 DQ 04014000000000000r ; |
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232
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233 leaf_call PROC
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234 mov DWORD PTR [rsp+32], r9d
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235 mov QWORD PTR [rsp+24], r8
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236 mov QWORD PTR [rsp+16], rdx
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237 mov DWORD PTR [rsp+8], ecx
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238 ret 0
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239 leaf_call ENDP
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240
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241 $T1 = 80
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242 $T2 = 96
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243 $T3 = 112
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244 $T4 = 128
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245 x$ = 144
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246 b$ = 408
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247 c$ = 416
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248 d$ = 424
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249 e$ = 432
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250 f$ = 440
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251 g$ = 448
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252 h$ = 456
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253 i$ = 464
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254 j$ = 472
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255 nonleaf_call PROC
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256 mov QWORD PTR [rsp+32], r9
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257 mov QWORD PTR [rsp+24], r8
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258 mov DWORD PTR [rsp+16], edx
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259 mov DWORD PTR [rsp+8], ecx
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260 push rsi
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261 push rdi
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262 sub rsp, 376
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263 mov BYTE PTR x$[rsp], 76
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264 lea rax, QWORD PTR x$[rsp+1]
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265 mov rdi, rax
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266 xor eax, eax
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267 mov ecx, 219
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268 rep stosb
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269 lea rax, QWORD PTR $T3[rsp]
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270 mov rdi, rax
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271 mov rsi, QWORD PTR h$[rsp]
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272 mov ecx, 16
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273 rep movsb
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274 lea rax, QWORD PTR $T1[rsp]
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275 mov rdi, rax
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276 mov rsi, QWORD PTR g$[rsp]
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277 mov ecx, 12
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278 rep movsb
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279 lea rax, QWORD PTR $T4[rsp]
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280 mov rdi, rax
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281 mov rsi, QWORD PTR d$[rsp]
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282 mov ecx, 16
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283 rep movsb
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284 lea rax, QWORD PTR $T2[rsp]
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285 mov rdi, rax
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286 mov rsi, QWORD PTR c$[rsp]
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287 mov ecx, 12
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288 rep movsb
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289 mov eax, DWORD PTR j$[rsp]
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290 mov DWORD PTR [rsp+64], eax
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291 mov eax, DWORD PTR i$[rsp]
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292 mov DWORD PTR [rsp+56], eax
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293 lea rax, QWORD PTR $T3[rsp]
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294 mov QWORD PTR [rsp+48], rax
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295 lea rax, QWORD PTR $T1[rsp]
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296 mov QWORD PTR [rsp+40], rax
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297 mov eax, DWORD PTR f$[rsp]
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298 mov DWORD PTR [rsp+32], eax
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299 mov r9d, DWORD PTR e$[rsp]
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300 lea r8, QWORD PTR $T4[rsp]
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301 lea rdx, QWORD PTR $T2[rsp]
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302 mov ecx, DWORD PTR b$[rsp]
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303 call leaf_call
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304 add rsp, 376
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305 pop rdi
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306 pop rsi
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307 ret 0
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308 nonleaf_call ENDP
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309
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310 c$ = 80
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311 a$ = 96
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312 $T1 = 112
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313 $T2 = 128
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314 d$ = 144
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315 b$ = 160
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316 $T3 = 176
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317 $T4 = 192
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318 main PROC
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319 push rsi
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320 push rdi
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321 sub rsp, 216
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322 mov DWORD PTR a$[rsp], 2
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323 mov DWORD PTR a$[rsp+4], 3
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324 movss xmm0, DWORD PTR __real@40800000
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325 movss DWORD PTR a$[rsp+8], xmm0
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326 movsd xmm0, QWORD PTR __real@4014000000000000
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327 movsd QWORD PTR b$[rsp], xmm0
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328 mov QWORD PTR b$[rsp+8], 6
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329 mov DWORD PTR c$[rsp], 9
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330 mov DWORD PTR c$[rsp+4], 10
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331 movss xmm0, DWORD PTR __real@41300000
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332 movss DWORD PTR c$[rsp+8], xmm0
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333 movsd xmm0, QWORD PTR __real@4028000000000000
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334 movsd QWORD PTR d$[rsp], xmm0
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335 mov QWORD PTR d$[rsp+8], 13
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336 lea rax, QWORD PTR $T3[rsp]
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337 lea rcx, QWORD PTR d$[rsp]
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338 mov rdi, rax
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339 mov rsi, rcx
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340 mov ecx, 16
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341 rep movsb
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342 lea rax, QWORD PTR $T1[rsp]
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343 lea rcx, QWORD PTR c$[rsp]
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344 mov rdi, rax
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345 mov rsi, rcx
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346 mov ecx, 12
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347 rep movsb
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348 lea rax, QWORD PTR $T4[rsp]
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349 lea rcx, QWORD PTR b$[rsp]
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350 mov rdi, rax
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351 mov rsi, rcx
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352 mov ecx, 16
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353 rep movsb
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354 lea rax, QWORD PTR $T2[rsp]
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355 lea rcx, QWORD PTR a$[rsp]
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356 mov rdi, rax
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357 mov rsi, rcx
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358 mov ecx, 12
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359 rep movsb
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360 mov DWORD PTR [rsp+72], 15
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361 mov DWORD PTR [rsp+64], 14
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362 lea rax, QWORD PTR $T3[rsp]
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363 mov QWORD PTR [rsp+56], rax
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364 lea rax, QWORD PTR $T1[rsp]
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365 mov QWORD PTR [rsp+48], rax
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366 mov DWORD PTR [rsp+40], 8
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367 mov DWORD PTR [rsp+32], 7
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368 lea r9, QWORD PTR $T4[rsp]
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369 lea r8, QWORD PTR $T2[rsp]
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370 mov edx, 1
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371 xor ecx, ecx
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372 call nonleaf_call
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373 xor eax, eax
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374 add rsp, 216
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375 pop rdi
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376 pop rsi
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377 ret 0
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378 main ENDP
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379
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380
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381
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382 ; ---------- returning tiny struct by value (passes via regs) ---------->
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383 ;
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384 ; struct A { unsigned char a; };
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385 ;
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386 ; struct A call(unsigned char c)
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387 ; {
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388 ; struct A r = {c};
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389 ; return r;
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390 ; }
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391 ;
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392 ; int main()
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393 ; {
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394 ; struct A a = call(123);
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395 ; return 0;
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396 ; }
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397
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398
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399
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400 ; output from godbolt compiler explorer w/ msvc 19.0
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401
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402 r$ = 0
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403 c$ = 32
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404 call PROC
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405 mov BYTE PTR [rsp+8], cl ; | spill
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406 sub rsp, 24 ; | prolog
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407 movzx eax, BYTE PTR c$[rsp] ; in arg 0 (fetched from spill area) -> eax, then ...
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408 mov BYTE PTR r$[rsp], al ; ... -> struct in local area (top of stack, as leaf call and thus no reserved spill area)
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409 movzx eax, BYTE PTR r$[rsp] ; reget same value into eax to return (small) struct via reg (a bit pointless to refetch)
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410 add rsp, 24 ; |
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411 ret 0 ; | epilog
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412 call ENDP
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413
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414 a$ = 32
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415 main PROC
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416 sub rsp, 56 ; prolog
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417 mov cl, 123 ; arg 0
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418 call call ; push return addr and call
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419 mov BYTE PTR a$[rsp], al ; write struct data to local area (123)
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420 xor eax, eax ; return value
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421 add rsp, 56 ; |
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422 ret 0 ; | epilog
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423 main ENDP
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424
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425
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426 ; vim: ft=asm
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427