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1 #!/usr/local/bin/perl | |
2 # x86 assember | |
3 | |
4 sub bn_add_words | |
5 { | |
6 local($name)=@_; | |
7 | |
8 &function_begin($name,""); | |
9 | |
10 &comment(""); | |
11 $a="esi"; | |
12 $b="edi"; | |
13 $c="eax"; | |
14 $r="ebx"; | |
15 $tmp1="ecx"; | |
16 $tmp2="edx"; | |
17 $num="ebp"; | |
18 | |
19 &mov($r,&wparam(0)); # get r | |
20 &mov($a,&wparam(1)); # get a | |
21 &mov($b,&wparam(2)); # get b | |
22 &mov($num,&wparam(3)); # get num | |
23 &xor($c,$c); # clear carry | |
24 &and($num,0xfffffff8); # num / 8 | |
25 | |
26 &jz(&label("aw_finish")); | |
27 | |
28 &set_label("aw_loop",0); | |
29 for ($i=0; $i<8; $i++) | |
30 { | |
31 &comment("Round $i"); | |
32 | |
33 &mov($tmp1,&DWP($i*4,$a,"",0)); # *a | |
34 &mov($tmp2,&DWP($i*4,$b,"",0)); # *b | |
35 &add($tmp1,$c); | |
36 &mov($c,0); | |
37 &adc($c,$c); | |
38 &add($tmp1,$tmp2); | |
39 &adc($c,0); | |
40 &mov(&DWP($i*4,$r,"",0),$tmp1); # *r | |
41 } | |
42 | |
43 &comment(""); | |
44 &add($a,32); | |
45 &add($b,32); | |
46 &add($r,32); | |
47 &sub($num,8); | |
48 &jnz(&label("aw_loop")); | |
49 | |
50 &set_label("aw_finish",0); | |
51 &mov($num,&wparam(3)); # get num | |
52 &and($num,7); | |
53 &jz(&label("aw_end")); | |
54 | |
55 for ($i=0; $i<7; $i++) | |
56 { | |
57 &comment("Tail Round $i"); | |
58 &mov($tmp1,&DWP($i*4,$a,"",0)); # *a | |
59 &mov($tmp2,&DWP($i*4,$b,"",0));# *b | |
60 &add($tmp1,$c); | |
61 &mov($c,0); | |
62 &adc($c,$c); | |
63 &add($tmp1,$tmp2); | |
64 &adc($c,0); | |
65 &dec($num) if ($i != 6); | |
66 &mov(&DWP($i*4,$r,"",0),$tmp1); # *a | |
67 &jz(&label("aw_end")) if ($i != 6); | |
68 } | |
69 &set_label("aw_end",0); | |
70 | |
71 # &mov("eax",$c); # $c is "eax" | |
72 | |
73 &function_end($name); | |
74 } | |
75 | |
76 1; | |
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