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; 77
