Mercurial > pub > dyncall > dyncall
annotate doc/disas_examples/x86.fastcall_ms.disas @ 470:79e76734bb5c
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author | Tassilo Philipp |
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date | Mon, 07 Feb 2022 22:41:32 +0100 |
parents | 984e6652b975 |
children | 585dcb68f55d |
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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) |
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8 ; { |
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9 ; /* use some local data */ |
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10 ; *(char*)alloca(220) = 'L'; |
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11 ; leaf_call(b, c, d, e, f, g, h); |
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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); |
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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 godbolt compiler explorer w/ msvc 19.0 (/Gr for fastcall) |
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23 |
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24 _b$ = -8 |
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25 _c$ = -4 |
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26 @leaf_call@28 PROC |
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27 push ebp |
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28 mov ebp, esp |
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29 sub esp, 8 |
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30 mov DWORD PTR _c$[ebp], edx |
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31 mov DWORD PTR _b$[ebp], ecx |
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32 mov esp, ebp |
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33 pop ebp |
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34 ret 20 |
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35 @leaf_call@28 ENDP |
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36 |
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37 _a$ = -8 |
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38 _b$ = -4 |
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39 _c$ = 8 |
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40 _d$ = 12 |
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41 _e$ = 16 |
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42 _f$ = 20 |
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43 _g$ = 24 |
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44 _h$ = 28 |
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45 @nonleaf_call@32 PROC |
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46 push ebp ; | |
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47 mov ebp, esp ; | prolog |
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48 sub esp, 8 ; | |
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49 mov DWORD PTR _b$[ebp], edx ; in arg 1 -> local area on stack |
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50 mov DWORD PTR _a$[ebp], ecx ; in arg 0 -> local area on stack |
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51 mov ecx, 220 ; | |
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52 call @alloca@4 ; | call alloca(220) (ecx = arg) |
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53 mov BYTE PTR [eax], 76 ; 'L' -> alloca()'d space (pointed to by alloca's retval in eax) |
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54 mov eax, DWORD PTR _h$[ebp] ; | |
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55 push eax ; | |
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56 mov ecx, DWORD PTR _g$[ebp] ; | |
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57 push ecx ; | |
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58 mov edx, DWORD PTR _f$[ebp] ; | read in args 3-7 from prev frame's param area, and ... |
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59 push edx ; | ... "push" onto stack as arg 2-6 |
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60 mov eax, DWORD PTR _e$[ebp] ; | |
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61 push eax ; | |
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62 mov ecx, DWORD PTR _d$[ebp] ; | |
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63 push ecx ; | |
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64 mov edx, DWORD PTR _c$[ebp] ; arg 1 | read from prev frame's param |
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65 mov ecx, DWORD PTR _b$[ebp] ; arg 0 | area and put in regs |
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66 call @leaf_call@28 ; push return address and call |
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67 mov esp, ebp ; | |
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68 pop ebp ; | epilog |
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69 ret 24 ; | |
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70 @nonleaf_call@32 ENDP |
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71 |
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72 _main PROC |
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73 push ebp ; | prolog |
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74 mov ebp, esp ; | |
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75 push 7 ; arg 7 |
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76 push 6 ; arg 6 |
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77 push 5 ; arg 5 |
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78 push 4 ; arg 4 |
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79 push 3 ; arg 3 |
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80 push 2 ; arg 2 |
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81 mov edx, 1 ; arg 1 (via reg) |
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82 xor ecx, ecx ; arg 0 (via reg) |
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83 call @nonleaf_call@32 ; push return address and call |
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84 xor eax, eax ; return value |
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85 pop ebp ; | |
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86 ret 0 ; | epilog |
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87 _main ENDP |
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88 |
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89 |
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90 |
470 | 91 ; ---------- structs by value (arg and return value), struct arg not fitting in regs ----------> |
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92 ; |
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93 ; struct A { int x; short y; char z; long long t; }; |
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94 ; |
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95 ; struct A leaf_call(struct A a, short b, long long c, char d, int e, int f, int g, long long h) |
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96 ; { |
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97 ; a.x += 1; |
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98 ; return a; |
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99 ; } |
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100 ; |
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101 ; int main() |
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102 ; { |
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103 ; struct A a ={9, 99, 23, 12LL}; |
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104 ; leaf_call(a, 1, 2, 3, 4, 5, 6, 7LL); |
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105 ; return 0; |
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106 ; } |
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107 |
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108 |
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109 |
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110 ; output from godbolt compiler explorer w/ msvc 19.0 (/Gr for fastcall) |
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111 |
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112 _b$ = -8 |
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113 _d$ = -4 |
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114 $T1 = 8 |
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115 _a$ = 12 |
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116 _c$ = 28 |
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117 _e$ = 36 |
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118 _f$ = 40 |
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119 _g$ = 44 |
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120 _h$ = 48 |
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121 @leaf_call@52 PROC |
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122 push ebp ; | |
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123 mov ebp, esp ; | prolog |
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124 sub esp, 8 ; | |
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125 mov BYTE PTR _d$[ebp], dl ; in arg 3 -> local area on stack |
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126 mov WORD PTR _b$[ebp], cx ; in arg 1 -> local area on stack |
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127 mov eax, DWORD PTR _a$[ebp] ; \ |
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128 add eax, 1 ; | get struct's x (from stack args), add 1 and write back |
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129 mov DWORD PTR _a$[ebp], eax ; / |
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130 mov ecx, DWORD PTR $T1[ebp] ; get ptr to retval struct passed as hidden arg (+8 to skip retval and saved ebp) |
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131 mov edx, DWORD PTR _a$[ebp] ; | |
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132 mov DWORD PTR [ecx], edx ; | |
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133 mov eax, DWORD PTR _a$[ebp+4] ; | |
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134 mov DWORD PTR [ecx+4], eax ; | copy modified (b/c of x+=1) struct arg to space of retval |
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135 mov edx, DWORD PTR _a$[ebp+8] ; | |
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136 mov DWORD PTR [ecx+8], edx ; | |
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137 mov eax, DWORD PTR _a$[ebp+12] ; | |
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138 mov DWORD PTR [ecx+12], eax ; | |
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139 mov eax, DWORD PTR $T1[ebp] ; return value (= ptr to struct that was passed-in as hidden arg) |
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140 mov esp, ebp ; | |
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141 pop ebp ; | epilog |
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142 ret 48 ; | |
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143 @leaf_call@52 ENDP |
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144 |
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145 $T1 = -32 |
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146 _a$ = -16 |
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147 _main PROC |
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148 push ebp ; | |
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149 mov ebp, esp ; | prolog |
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150 sub esp, 32 ; / 32 = 16b local area for struct + 16b space used for retval struct |
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151 mov DWORD PTR _a$[ebp], 9 ; \ int x |
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152 mov eax, 99 ; | | |
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153 mov WORD PTR _a$[ebp+4], ax ; | struct values (local area) | short y |
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154 mov BYTE PTR _a$[ebp+6], 23 ; | char z |
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155 mov DWORD PTR _a$[ebp+8], 12 ; | | |
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156 mov DWORD PTR _a$[ebp+12], 0 ; / | long long t |
470 | 157 push 0 ; \ |
469
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158 push 7 ; | arg 7 |
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159 push 6 ; arg 6 |
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160 push 5 ; arg 5 |
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161 push 4 ; arg 4 |
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162 push 0 ; | |
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163 push 2 ; / arg 2 (via stack b/c not first arg and > 32 bits) |
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164 sub esp, 16 ; \ |
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165 mov ecx, esp ; | |
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166 mov edx, DWORD PTR _a$[ebp] ; | |
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167 mov DWORD PTR [ecx], edx ; | |
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168 mov eax, DWORD PTR _a$[ebp+4] ; | |
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169 mov DWORD PTR [ecx+4], eax ; | arg 0 (struct), "pushed" onto stack (fetched from local area) |
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170 mov edx, DWORD PTR _a$[ebp+8] ; | |
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171 mov DWORD PTR [ecx+8], edx ; | |
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172 mov eax, DWORD PTR _a$[ebp+12] ; | |
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173 mov DWORD PTR [ecx+12], eax ; / |
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174 lea ecx, DWORD PTR $T1[ebp] ; \ ptr to space used for struct retval (pushed as hidden first arg) |
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175 push ecx ; | |
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176 mov dl, 3 ; arg 3 (via reg) |
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177 mov ecx, 1 ; arg 1 (via reg) |
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178 call @leaf_call@52 ; push return address and call |
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179 xor eax, eax ; return value |
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180 mov esp, ebp ; | |
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181 pop ebp ; | epilog |
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182 ret 0 ; | |
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183 _main ENDP |
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184 |
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185 |
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186 |
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187 ; vim: ft=asm |
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188 |