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annotate doc/disas_examples/x86.plan9call.disas @ 457:90b1d927912a

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- suite_aggrs: make sure random memory used doesn't ever result in NaN fp values (for every possible address), as this messes with result comparison
author Tassilo Philipp
date Fri, 28 Jan 2022 14:11:21 +0100 (2022-01-28)
parents 97fff5d9cea1
children e5820b7a3fbc
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1 ; void leaf_call(int a, int b, int c, int d, int e, int f)
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2 ; {
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3 ; }
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4 ;
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5 ; int nonleaf_call(int a, int b, int c, int d, int e, int f, int g)
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6 ; {
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7 ; leaf_call(b,c,d,e,f,g);
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8 ; return 'x';
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9 ; }
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10 ;
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11 ; int main()
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12 ; {
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13 ; nonleaf_call(0,1,2,3,4,5,6);
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14 ; return 0;
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15 ; }
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19 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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20
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21 001020 (1) TEXT leaf_call+0(SB),$0
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22 001020 c3 (3) RET ,
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24 001021 (5) TEXT nonleaf_call+0(SB),$28
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25 001021 83ec1c (5) SUBL $28,SP ; prolog (note, there is no register save area at all)
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26 001024 8b442424 (7) MOVL b+36(FP),AX ; |
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27 001028 890424 (7) MOVL AX,(SP) ; |
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28 00102b 8b442428 (7) MOVL c+40(FP),AX ; |
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29 00102f 89442404 (7) MOVL AX,4(SP) ; |
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30 001033 8b44242c (7) MOVL d+44(FP),AX ; |
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31 001037 89442408 (7) MOVL AX,8(SP) ; | fetch in args from prev frame's param area ...
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32 00103b 8b442430 (7) MOVL e+48(FP),AX ; | ... and "push" onto stack
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33 00103f 8944240c (7) MOVL AX,12(SP) ; |
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34 001043 8b442434 (7) MOVL f+52(FP),AX ; |
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35 001047 89442410 (7) MOVL AX,16(SP) ; |
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36 00104b 8b442438 (7) MOVL g+56(FP),AX ; |
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37 00104f 89442414 (7) MOVL AX,20(SP) ; |
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38 001053 e8c8ffffff (7) CALL ,1020+leaf_call ; push return address and call
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39 001058 b878000000 (8) MOVL $120,AX ; return value: 'x' -> eax
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40 00105d 83c41c (8) ADDL $28,SP ; |
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41 001060 c3 (8) RET , ; | epilog
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43 001061 (11) TEXT main+0(SB),$32
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44 001061 83ec20 (11) SUBL $32,SP ; prolog (note, there is no register save area at all)
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45 001064 c7042400000000 (13) MOVL $0,(SP) ; arg 0 -> "push" onto stack
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46 00106b b801000000 (13) MOVL $1,AX ; arg 1 -> eax, then ...
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47 001070 89442404 (13) MOVL AX,4(SP) ; ... "pushed" onto stack
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48 001074 b802000000 (13) MOVL $2,AX ; arg 2 -> eax, then ...
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49 001079 89442408 (13) MOVL AX,8(SP) ; ... "pushed" onto stack
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50 00107d b803000000 (13) MOVL $3,AX ; .
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51 001082 8944240c (13) MOVL AX,12(SP) ; .
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52 001086 b804000000 (13) MOVL $4,AX ; .
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53 00108b 89442410 (13) MOVL AX,16(SP) ; .
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54 00108f b805000000 (13) MOVL $5,AX ; .
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55 001094 89442414 (13) MOVL AX,20(SP) ; .
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56 001098 b806000000 (13) MOVL $6,AX ; arg 6 -> eax, then ...
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57 00109d 89442418 (13) MOVL AX,24(SP) ; ... "pushed" onto stack
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58 0010a1 e87bffffff (13) CALL ,1021+nonleaf_call ; push return address and call
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59 0010a6 31c0 (14) MOVL $0,AX ; return value
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60 0010a8 83c420 (14) ADDL $32,SP ; |
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61 0010ab c3 (14) RET , ; | epilog
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62
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64
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65 ; ---------- structs by value ---------->
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66 ;
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67 ; struct A { int i, j; long long l; };
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68 ;
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69 ; void leaf_call(int b, int c, int d, int e, struct A f, int g, int h)
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70 ; {
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71 ; }
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72 ;
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73 ; void nonleaf_call(int a, int b, int c, int d, int e, struct A f, int g, int h)
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74 ; {
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75 ; /* use some local data */
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76 ; char l[100] = 'L';
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77 ; leaf_call(b, c, d, e, f, g, h);
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78 ; }
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79 ;
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80 ; int main()
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81 ; {
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82 ; nonleaf_call(0, 1, 2, 3, 4, (struct A){5, 6, 7ll}, 8, 9);
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83 ; return 0;
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84 ; }
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87
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88 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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89
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90 001020 (3) TEXT leaf_call+0(SB),$0
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91 001020 c3 (5) RET ,
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93 001021 (7) TEXT nonleaf_call+0(SB),$148
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94 001021 81ec94000000 (7) SUBL $148,SP ; prolog (note, there is no register save area at all)
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95 001027 8d842494000000 (10) LEAL l+148(SP),AX ; |
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96 00102e 89442430 (10) MOVL AX,l+48(SP) ; | loop's write ptr (stored at beginning of char[100] space)
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97 001032 83442430fc (10) ADDL $-4,l+48(SP) ; | decr loop ptr in memory
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98 001037 8b442430 (10) MOVL l+48(SP),AX ; | ptr -> eax
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99 00103b c70000000000 (10) MOVL $0,(AX) ; | zero-init char[100] space write a 0
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100 001041 837c243000 (10) CMPL l+48(SP),$0 ; | cmp if done
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101 001046 75ea (10) JNE ,1032 ; | loop
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102 001048 c64424304c (10) MOVB $76,l+48(SP) ; 'L' -> local area (beginning of char[100] space)
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103 00104d 8b84249c000000 (11) MOVL b+156(FP),AX ; |
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104 001054 890424 (11) MOVL AX,(SP) ; |
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105 001057 8b8424a0000000 (11) MOVL c+160(FP),AX ; |
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106 00105e 89442404 (11) MOVL AX,4(SP) ; | fetch in args (ints before struct) from prev frame's param area ...
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107 001062 8b8424a4000000 (11) MOVL d+164(FP),AX ; | ... and "push" onto stack
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108 001069 89442408 (11) MOVL AX,8(SP) ; |
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109 00106d 8b8424a8000000 (11) MOVL e+168(FP),AX ; |
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110 001074 8944240c (11) MOVL AX,12(SP) ; /
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111 001078 8d7c2410 (11) LEAL 16(SP),DI ; \ dst ptr
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112 00107c 8db424ac000000 (11) LEAL f+172(FP),SI ; | src ptr
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113 001083 b904000000 (11) MOVL $4,CX ; | rep counter (4, for dwords = 16b = sizeof(struct A))
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114 001088 fc (11) CLD , ; | copy struct to next call's stack
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115 001089 f3 (11) REP , ; |
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116 00108a a5 (11) MOVSL , ; /
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117 00108b 8b8424bc000000 (11) MOVL g+188(FP),AX ; \
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118 001092 89442420 (11) MOVL AX,32(SP) ; | fetch remaining in args (ints after struct) from prev frame's param area ...
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119 001096 8b8424c0000000 (11) MOVL h+192(FP),AX ; | ... and "push" onto stack
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120 00109d 89442424 (11) MOVL AX,36(SP) ; |
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121 0010a1 e87affffff (11) CALL ,1020+leaf_call ; push return address and call
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122 0010a6 81c494000000 (11) ADDL $148,SP ; |
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123 0010ac c3 (11) RET , ; | epilog
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124
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125 0010ad (14) TEXT main+0(SB),$52
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126 0010ad 83ec34 (14) SUBL $52,SP ; prolog (note, there is no register save area at all)
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127 0010b0 c7042400000000 (16) MOVL $0,(SP) ; arg 0 -> "push" onto stack
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128 0010b7 b801000000 (16) MOVL $1,AX ; arg 1 -> eax, then ...
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129 0010bc 89442404 (16) MOVL AX,4(SP) ; ... "pushed" onto stack
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130 0010c0 b802000000 (16) MOVL $2,AX ; arg 2 -> eax, then ...
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131 0010c5 89442408 (16) MOVL AX,8(SP) ; ... "pushed" onto stack
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132 0010c9 b803000000 (16) MOVL $3,AX ; .
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133 0010ce 8944240c (16) MOVL AX,12(SP) ; .
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134 0010d2 b804000000 (16) MOVL $4,AX ; .
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135 0010d7 89442410 (16) MOVL AX,16(SP) ; .
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136 0010db 8d442414 (16) LEAL 20(SP),AX ; get ptr to next (unused) stack bytes -> eax ...
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137 0010df 89442430 (16) MOVL AX,.safe+48(SP) ; ... and write it to very top of stack (seems aligned and not adjacent to last arg) | looks like callconv keeps a ptr to
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138 0010e3 8b442430 (16) MOVL .safe+48(SP),AX ; regetting of same ptr into eax (pointless as same as in eax) | each struct params in local area
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139 0010e7 c70005000000 (16) MOVL $5,(AX) ; |
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140 0010ed 8b442430 (16) MOVL .safe+48(SP),AX ; |
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141 0010f1 c7400406000000 (16) MOVL $6,4(AX) ; | copy struct linearly to stack, adjacent to other args
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142 0010f8 8b442430 (16) MOVL .safe+48(SP),AX ; |
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
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143 0010fc c7400807000000 (16) MOVL $7,8(AX) ; |
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144 001103 c7400c00000000 (16) MOVL $0,12(AX) ; | msbytes of long long
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145 00110a b808000000 (16) MOVL $8,AX ; arg 6 -> eax, then ...
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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146 00110f 89442424 (16) MOVL AX,36(SP) ; ... "pushed" onto stack
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147 001113 b809000000 (16) MOVL $9,AX ; arg 7 -> eax, then ...
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148 001118 89442428 (16) MOVL AX,40(SP) ; ... "pushed" onto stack
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149 00111c e800ffffff (16) CALL ,1021+nonleaf_call ; push return address and call
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150 001121 31c0 (17) MOVL $0,AX ; return value
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151 001123 83c434 (17) ADDL $52,SP ; |
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152 001126 c3 (17) RET , ; | epilog
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153
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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154
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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155
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156 ; ---------- structs by value, complex example (multiple structs) ---------->
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157 ;
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158 ; struct A { int i, j; float f; };
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159 ; struct B { double d; long long l; };
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160 ;
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161 ; 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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162 ; {
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163 ; }
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164 ;
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165 ; 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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166 ; {
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167 ; /* use some local data */
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168 ; char l[100] = 'L';
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169 ; leaf_call(b, c, d, e, f, g, h, i, j);
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170 ; }
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171 ;
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172 ; int main()
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173 ; {
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174 ; nonleaf_call(0, 1, (struct A){2, 3, 4.f}, (struct B){5., 6ll}, 7, 8, (struct A){9, 10, 11.f}, (struct B){12., 13ll}, 14, 15);
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175 ; return 0;
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176 ; }
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177
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diff changeset
178
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179
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180 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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181
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182 001020 (4) TEXT leaf_call+0(SB),$0
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183 001020 c3 (6) RET ,
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184
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185 001021 (8) TEXT nonleaf_call+0(SB),$184
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diff changeset
186 001021 81ecb8000000 (8) SUBL $184,SP
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187 001027 8d8424b8000000 (11) LEAL l+184(SP),AX
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diff changeset
188 00102e 89442454 (11) MOVL AX,l+84(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
189 001032 83442454fc (11) ADDL $-4,l+84(SP)
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parents: 327
diff changeset
190 001037 8b442454 (11) MOVL l+84(SP),AX
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parents: 327
diff changeset
191 00103b c70000000000 (11) MOVL $0,(AX)
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192 001041 837c245400 (11) CMPL l+84(SP),$0
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193 001046 75ea (11) JNE ,1032
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194 001048 c64424544c (11) MOVB $76,l+84(SP)
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195 00104d 8b8424c0000000 (12) MOVL b+192(FP),AX
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196 001054 890424 (12) MOVL AX,(SP)
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197 001057 8d7c2404 (12) LEAL 4(SP),DI
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198 00105b 8db424c4000000 (12) LEAL c+196(FP),SI
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199 001062 b903000000 (12) MOVL $3,CX
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diff changeset
200 001067 fc (12) CLD ,
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diff changeset
201 001068 f3 (12) REP ,
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diff changeset
202 001069 a5 (12) MOVSL ,
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diff changeset
203 00106a 8d7c2410 (12) LEAL 16(SP),DI
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diff changeset
204 00106e 8db424d0000000 (12) LEAL d+208(FP),SI
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parents: 327
diff changeset
205 001075 b904000000 (12) MOVL $4,CX
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diff changeset
206 00107a fc (12) CLD ,
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diff changeset
207 00107b f3 (12) REP ,
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diff changeset
208 00107c a5 (12) MOVSL ,
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209 00107d 8b8424e0000000 (12) MOVL e+224(FP),AX
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parents: 327
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210 001084 89442420 (12) MOVL AX,32(SP)
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diff changeset
211 001088 8b8424e4000000 (12) MOVL f+228(FP),AX
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parents: 327
diff changeset
212 00108f 89442424 (12) MOVL AX,36(SP)
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diff changeset
213 001093 8d7c2428 (12) LEAL 40(SP),DI
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diff changeset
214 001097 8db424e8000000 (12) LEAL g+232(FP),SI
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diff changeset
215 00109e b903000000 (12) MOVL $3,CX
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diff changeset
216 0010a3 fc (12) CLD ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
217 0010a4 f3 (12) REP ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
218 0010a5 a5 (12) MOVSL ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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diff changeset
219 0010a6 8d7c2434 (12) LEAL 52(SP),DI
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
220 0010aa 8db424f4000000 (12) LEAL h+244(FP),SI
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
221 0010b1 b904000000 (12) MOVL $4,CX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
222 0010b6 fc (12) CLD ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
223 0010b7 f3 (12) REP ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
224 0010b8 a5 (12) MOVSL ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
225 0010b9 8b842404010000 (12) MOVL i+260(FP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
226 0010c0 89442444 (12) MOVL AX,68(SP)
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diff changeset
227 0010c4 8b842408010000 (12) MOVL j+264(FP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
228 0010cb 89442448 (12) MOVL AX,72(SP)
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diff changeset
229 0010cf e84cffffff (12) CALL ,1020+leaf_call
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230 0010d4 81c4b8000000 (12) ADDL $184,SP
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diff changeset
231 0010da c3 (12) RET ,
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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diff changeset
232
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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233 0010db (15) TEXT main+0(SB),$100
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diff changeset
234 0010db 83ec64 (15) SUBL $100,SP
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parents: 327
diff changeset
235 0010de c7042400000000 (17) MOVL $0,(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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diff changeset
236 0010e5 b801000000 (17) MOVL $1,AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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diff changeset
237 0010ea 89442404 (17) MOVL AX,4(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
238 0010ee 8d442408 (17) LEAL 8(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
239 0010f2 89442460 (17) MOVL AX,.safe+96(SP)
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parents: 327
diff changeset
240 0010f6 8b442460 (17) MOVL .safe+96(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
241 0010fa c70002000000 (17) MOVL $2,(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
242 001100 8b442460 (17) MOVL .safe+96(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
243 001104 c7400403000000 (17) MOVL $3,4(AX)
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diff changeset
244 00110b dd0500200000 (17) FMOVD $0.40100000+0(SB),F0
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
245 001111 8b442460 (17) MOVL .safe+96(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
246 001115 d95808 (17) FMOVFP F0,8(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
247 001118 8d442414 (17) LEAL 20(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
248 00111c 8944245c (17) MOVL AX,.safe+92(SP)
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parents: 327
diff changeset
249 001120 dd0508200000 (17) FMOVD $0.40140000+0(SB),F0
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
250 001126 8b44245c (17) MOVL .safe+92(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
251 00112a dd18 (17) FMOVDP F0,(AX)
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diff changeset
252 00112c 8b44245c (17) MOVL .safe+92(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
253 001130 c7400806000000 (17) MOVL $6,8(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
254 001137 c7400c00000000 (17) MOVL $0,12(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
255 00113e b807000000 (17) MOVL $7,AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
256 001143 89442424 (17) MOVL AX,36(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
257 001147 b808000000 (17) MOVL $8,AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
258 00114c 89442428 (17) MOVL AX,40(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
259 001150 8d44242c (17) LEAL 44(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
260 001154 89442458 (17) MOVL AX,.safe+88(SP)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
261 001158 8b442458 (17) MOVL .safe+88(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
262 00115c c70009000000 (17) MOVL $9,(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
263 001162 8b442458 (17) MOVL .safe+88(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
264 001166 c740040a000000 (17) MOVL $10,4(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
265 00116d dd0510200000 (17) FMOVD $0.40260000+0(SB),F0
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
266 001173 8b442458 (17) MOVL .safe+88(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
267 001177 d95808 (17) FMOVFP F0,8(AX)
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
268 00117a 8d442438 (17) LEAL 56(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
diff changeset
269 00117e 89442454 (17) MOVL AX,.safe+84(SP)
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parents: 327
diff changeset
270 001182 dd0518200000 (17) FMOVD $0.40280000+0(SB),F0
97fff5d9cea1 - plan9/x86 struct by value passing disas example
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parents: 327
diff changeset
271 001188 8b442454 (17) MOVL .safe+84(SP),AX
97fff5d9cea1 - plan9/x86 struct by value passing disas example
Tassilo Philipp
parents: 327
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272 00118c dd18 (17) FMOVDP F0,(AX)
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273 00118e 8b442454 (17) MOVL .safe+84(SP),AX
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274 001192 c740080d000000 (17) MOVL $13,8(AX)
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275 001199 c7400c00000000 (17) MOVL $0,12(AX)
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276 0011a0 b80e000000 (17) MOVL $14,AX
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277 0011a5 89442448 (17) MOVL AX,72(SP)
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278 0011a9 b80f000000 (17) MOVL $15,AX
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279 0011ae 8944244c (17) MOVL AX,76(SP)
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280 0011b2 e86afeffff (17) CALL ,1021+nonleaf_call
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281 0011b7 31c0 (18) MOVL $0,AX
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282 0011b9 83c464 (18) ADDL $100,SP
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283 0011bc c3 (18) RET ,
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284
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285 002000 0000000000001040 (17) DATA $0.40100000+0(SB)/8,$(40100000,00000000)
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286 002008 0000000000001440 (17) DATA $0.40140000+0(SB)/8,$(40140000,00000000)
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287 002010 0000000000002640 (17) DATA $0.40260000+0(SB)/8,$(40260000,00000000)
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288 002018 0000000000002840 (17) DATA $0.40280000+0(SB)/8,$(40280000,00000000)
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289
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291
327
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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292 ; vim: ft=asm
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293