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annotate doc/disas_examples/x86.plan9call.disas @ 473:ead041d93e36

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- ppc doc and disas examples related to aggregates
author Tassilo Philipp
date Wed, 16 Feb 2022 16:44:11 +0100
parents e5820b7a3fbc
children
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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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18
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19 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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20
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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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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42
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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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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 ; |
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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 ...
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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
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154
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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 */
473
ead041d93e36 - ppc doc and disas examples related to aggregates
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168 ; char l[100] = { 'L' };
447
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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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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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186 001021 81ecb8000000 (8) SUBL $184,SP
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187 001027 8d8424b8000000 (11) LEAL l+184(SP),AX
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188 00102e 89442454 (11) MOVL AX,l+84(SP)
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189 001032 83442454fc (11) ADDL $-4,l+84(SP)
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190 001037 8b442454 (11) MOVL l+84(SP),AX
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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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200 001067 fc (12) CLD ,
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201 001068 f3 (12) REP ,
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202 001069 a5 (12) MOVSL ,
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203 00106a 8d7c2410 (12) LEAL 16(SP),DI
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204 00106e 8db424d0000000 (12) LEAL d+208(FP),SI
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205 001075 b904000000 (12) MOVL $4,CX
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206 00107a fc (12) CLD ,
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207 00107b f3 (12) REP ,
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208 00107c a5 (12) MOVSL ,
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209 00107d 8b8424e0000000 (12) MOVL e+224(FP),AX
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210 001084 89442420 (12) MOVL AX,32(SP)
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211 001088 8b8424e4000000 (12) MOVL f+228(FP),AX
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212 00108f 89442424 (12) MOVL AX,36(SP)
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213 001093 8d7c2428 (12) LEAL 40(SP),DI
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214 001097 8db424e8000000 (12) LEAL g+232(FP),SI
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215 00109e b903000000 (12) MOVL $3,CX
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216 0010a3 fc (12) CLD ,
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217 0010a4 f3 (12) REP ,
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218 0010a5 a5 (12) MOVSL ,
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219 0010a6 8d7c2434 (12) LEAL 52(SP),DI
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220 0010aa 8db424f4000000 (12) LEAL h+244(FP),SI
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221 0010b1 b904000000 (12) MOVL $4,CX
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222 0010b6 fc (12) CLD ,
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223 0010b7 f3 (12) REP ,
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224 0010b8 a5 (12) MOVSL ,
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225 0010b9 8b842404010000 (12) MOVL i+260(FP),AX
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226 0010c0 89442444 (12) MOVL AX,68(SP)
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227 0010c4 8b842408010000 (12) MOVL j+264(FP),AX
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228 0010cb 89442448 (12) MOVL AX,72(SP)
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229 0010cf e84cffffff (12) CALL ,1020+leaf_call
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230 0010d4 81c4b8000000 (12) ADDL $184,SP
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231 0010da c3 (12) RET ,
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232
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233 0010db (15) TEXT main+0(SB),$100
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234 0010db 83ec64 (15) SUBL $100,SP
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235 0010de c7042400000000 (17) MOVL $0,(SP)
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236 0010e5 b801000000 (17) MOVL $1,AX
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237 0010ea 89442404 (17) MOVL AX,4(SP)
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238 0010ee 8d442408 (17) LEAL 8(SP),AX
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239 0010f2 89442460 (17) MOVL AX,.safe+96(SP)
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240 0010f6 8b442460 (17) MOVL .safe+96(SP),AX
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241 0010fa c70002000000 (17) MOVL $2,(AX)
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242 001100 8b442460 (17) MOVL .safe+96(SP),AX
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243 001104 c7400403000000 (17) MOVL $3,4(AX)
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244 00110b dd0500200000 (17) FMOVD $0.40100000+0(SB),F0
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245 001111 8b442460 (17) MOVL .safe+96(SP),AX
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246 001115 d95808 (17) FMOVFP F0,8(AX)
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diff changeset
247 001118 8d442414 (17) LEAL 20(SP),AX
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248 00111c 8944245c (17) MOVL AX,.safe+92(SP)
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249 001120 dd0508200000 (17) FMOVD $0.40140000+0(SB),F0
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250 001126 8b44245c (17) MOVL .safe+92(SP),AX
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251 00112a dd18 (17) FMOVDP F0,(AX)
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252 00112c 8b44245c (17) MOVL .safe+92(SP),AX
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253 001130 c7400806000000 (17) MOVL $6,8(AX)
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254 001137 c7400c00000000 (17) MOVL $0,12(AX)
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255 00113e b807000000 (17) MOVL $7,AX
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256 001143 89442424 (17) MOVL AX,36(SP)
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257 001147 b808000000 (17) MOVL $8,AX
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258 00114c 89442428 (17) MOVL AX,40(SP)
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259 001150 8d44242c (17) LEAL 44(SP),AX
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260 001154 89442458 (17) MOVL AX,.safe+88(SP)
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261 001158 8b442458 (17) MOVL .safe+88(SP),AX
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262 00115c c70009000000 (17) MOVL $9,(AX)
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263 001162 8b442458 (17) MOVL .safe+88(SP),AX
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264 001166 c740040a000000 (17) MOVL $10,4(AX)
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diff changeset
265 00116d dd0510200000 (17) FMOVD $0.40260000+0(SB),F0
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266 001173 8b442458 (17) MOVL .safe+88(SP),AX
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parents: 327
diff changeset
267 001177 d95808 (17) FMOVFP F0,8(AX)
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diff changeset
268 00117a 8d442438 (17) LEAL 56(SP),AX
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269 00117e 89442454 (17) MOVL AX,.safe+84(SP)
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270 001182 dd0518200000 (17) FMOVD $0.40280000+0(SB),F0
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271 001188 8b442454 (17) MOVL .safe+84(SP),AX
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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
472
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283 0011bc c3 (18) RET ,
447
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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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290
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291
472
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292 ; ---------- returning qwords ---------->
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293 ;
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294 ; long long f()
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295 ; {
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296 ; return 7171LL;
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297 ; }
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298 ;
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299 ; int main()
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300 ; {
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301 ; return (int)f();
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302 ; }
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303
473
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304
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305
472
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306 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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307
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308 001020 (2) TEXT f1+0(SB),$0
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309 001020 8b442404 (4) MOVL .ret+4(FP),AX ; ptr to retval space -> eax
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310 001024 c700031c0000 (4) MOVL $7171,(AX) ; |
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311 00102a c7400400000000 (4) MOVL $0,4(AX) ; | return value
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312 001031 c3 (4) RET ,
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313
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314 001032 (7) TEXT main+0(SB),$16
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315 001032 83ec10 (7) SUBL $16,SP ; prolog
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316 001035 8d4c2408 (9) LEAL .safe+8(SP),CX ; | ptr to space for return value ...
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317 001039 890c24 (9) MOVL CX,(SP) ; | ... pushed as implicit first arg
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318 00103c e8dfffffff (9) CALL ,1020+f1 ; push return address and call
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319 001041 8b442408 (9) MOVL .safe+8(SP),AX ; return value
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320 001045 8b54240c (9) MOVL .safe+12(SP),DX ; @@@ unsure, b/c we have a cast
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321 001049 83c410 (9) ADDL $16,SP ; |
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322 00104c c3 (9) RET , ; | epilog
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323
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324
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325
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326 ; ---------- returning structs by value ---------->
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327 ;
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328 ; struct Small { char x; };
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329 ; struct Big { long long i; long j; };
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330 ;
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331 ; struct Small f0()
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332 ; {
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333 ; struct Small s = { 132 };
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334 ; return s;
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335 ; }
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336 ;
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337 ; struct Big f1()
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338 ; {
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339 ; struct Big b = { 7171LL, 232 };
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340 ; return b;
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341 ; }
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342 ;
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343 ; int main()
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344 ; {
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345 ; struct Small s = f0();
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346 ; struct Big b = f1();
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347 ; return b.j + s.x;
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348 ; }
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349
473
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350
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351
472
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352 ; output from plan9-4th_edition-x86 w/ 8c x.c && 8l -a x.8
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353
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354 001020 (5) TEXT f0+0 (SB),$16
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355 001020 83ec08 (5) SUBL $8,SP ; prolog
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356 001023 c644240484 (7) MOVB $-124,s+4(SP) ; struct data in local area (s.x)
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357 001028 8b7c240c (8) MOVL .ret+12(FP),DI ; \
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358 00102c 8d742404 (8) LEAL s+4(SP),SI ; |
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359 001030 b901000000 (8) MOVL $1,CX ; | copy struct in local area to return
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360 001035 fc (8) CLD , ; | value (pointed to by implicit first arg)
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361 001036 f3 (8) REP , ; |
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362 001037 a5 (8) MOVSL , ; /
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363 001038 83c408 (8) ADDL $8,SP ; \
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364 00103b c3 (8) RET , ; | epilog
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365
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366 00103c (11) TEXT f1+0(SB),$16
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367 00103c 83ec10 (11) SUBL $16,SP ; prolog
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368 00103f c7442404031c0000 (13) MOVL $7171,b+4(SP) ; | |
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369 001047 c744240800000000 (13) MOVL $0,b+8(SP) ; | struct data in local area | b.i
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370 00104f c744240ce8000000 (13) MOVL $232,b+12(SP) ; / b.j
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371 001057 8b7c2414 (14) MOVL .ret+20(FP),DI ; \
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372 00105b 8d742404 (14) LEAL b+4(SP),SI ; |
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373 00105f b903000000 (14) MOVL $3,CX ; | copy struct in local area to return
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374 001064 fc (14) CLD , ; | value (pointed to by implicit first arg)
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375 001065 f3 (14) REP , ; |
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376 001066 a5 (14) MOVSL , ; /
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377 001067 83c410 (14) ADDL $16,SP ; \
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378 00106a c3 (14) RET , ; | epilog
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379
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380 00106b (17) TEXT main+0(SB),$28
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381 00106b 83ec1c (17) SUBL $28,SP ; prolog
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382 00106e 8d442418 (19) LEAL s+24(SP),AX ; | ptr to space for return value ...
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383 001072 890424 (19) MOVL AX,(SP) ; | ... pushed as implicit first arg
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384 001075 e8a6ffffff (19) CALL ,1020+f0 ; push return address and call
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385 00107a 8d44240c (20) LEAL b+12(SP),AX ; | ptr to space for return value ...
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386 00107e 890424 (20) MOVL AX,(SP) ; | ... pushed as implicit first arg
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387 001081 e8b6ffffff (20) CALL ,103c+f1 ; push return address and call
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388 001086 0fbe442418 (21) MOVBLSX s+24(SP),AX ; |
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389 00108b 03442414 (21) ADDL b+20(SP),AX ; / return value
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390 00108f 83c41c (21) ADDL $28,SP ; \
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391 001092 c3 (21) RET , ; | epilog
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392
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393
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394
327
c0390dc85a07 - doc: added disassembly examples for many platforms and calling conventions, for reference
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395 ; vim: ft=asm
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396