1 #!/usr/local/bin/perl 2 # x86 assember 3 4 sub bn_mul_words 5 { 6 local($name)=@_; 7 8 &function_begin($name,""); 9 10 &comment(""); 11 $Low="eax"; 12 $High="edx"; 13 $a="ebx"; 14 $w="ecx"; 15 $r="edi"; 16 $c="esi"; 17 $num="ebp"; 18 19 &xor($c,$c); # clear carry 20 &mov($r,&wparam(0)); # 21 &mov($a,&wparam(1)); # 22 &mov($num,&wparam(2)); # 23 &mov($w,&wparam(3)); # 24 25 &and($num,0xfffffff8); # num / 8 26 &jz(&label("mw_finish")); 27 28 &set_label("mw_loop",0); 29 for ($i=0; $i<32; $i+=4) 30 { 31 &comment("Round $i"); 32 33 &mov("eax",&DWP($i,$a,"",0)); # *a 34 &mul($w); # *a * w 35 &add("eax",$c); # L(t)+=c 36 # XXX 37 38 &adc("edx",0); # H(t)+=carry 39 &mov(&DWP($i,$r,"",0),"eax"); # *r= L(t); 40 41 &mov($c,"edx"); # c= H(t); 42 } 43 44 &comment(""); 45 &add($a,32); 46 &add($r,32); 47 &sub($num,8); 48 &jz(&label("mw_finish")); 49 &jmp(&label("mw_loop")); 50 51 &set_label("mw_finish",0); 52 &mov($num,&wparam(2)); # get num 53 &and($num,7); 54 &jnz(&label("mw_finish2")); 55 &jmp(&label("mw_end")); 56 57 &set_label("mw_finish2",1); 58 for ($i=0; $i<7; $i++) 59 { 60 &comment("Tail Round $i"); 61 &mov("eax",&DWP($i*4,$a,"",0));# *a 62 &mul($w); # *a * w 63 &add("eax",$c); # L(t)+=c 64 # XXX 65 &adc("edx",0); # H(t)+=carry 66 &mov(&DWP($i*4,$r,"",0),"eax");# *r= L(t); 67 &mov($c,"edx"); # c= H(t); 68 &dec($num) if ($i != 7-1); 69 &jz(&label("mw_end")) if ($i != 7-1); 70 } 71 &set_label("mw_end",0); 72 &mov("eax",$c); 73 74 &function_end($name); 75 } 76 77 1; 78
