1 #!/usr/bin/env perl 2 3 package x86masm; 4 5 *out=\@::out; 6 7 $::lbdecor="\$L"; # local label decoration 8 $nmdecor="_"; # external name decoration 9 10 $initseg=""; 11 $segment=""; 12 13 sub ::generic 14 { my ($opcode,@arg)=@_; 15 16 # fix hexadecimal constants 17 for (@arg) { s/0x([0-9a-f]+)/0$1h/oi; } 18 19 if ($opcode !~ /movq/) 20 { # fix xmm references 21 $arg[0] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[1]=~/\bxmm[0-7]\b/i); 22 $arg[1] =~ s/\b[A-Z]+WORD\s+PTR/XMMWORD PTR/i if ($arg[0]=~/\bxmm[0-7]\b/i); 23 } 24 25 &::emit($opcode,@arg); 26 1; 27 } 28 # 29 # opcodes not covered by ::generic above, mostly inconsistent namings... 30 # 31 sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 32 sub ::call_ptr { &::emit("call",@_); } 33 sub ::jmp_ptr { &::emit("jmp",@_); } 34 35 sub get_mem 36 { my($size,$addr,$reg1,$reg2,$idx)=@_; 37 my($post,$ret); 38 39 $ret .= "$size PTR " if ($size ne ""); 40 41 $addr =~ s/^\s+//; 42 # prepend global references with optional underscore 43 $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige; 44 # put address arithmetic expression in parenthesis 45 $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/); 46 47 if (($addr ne "") && ($addr ne 0)) 48 { if ($addr !~ /^-/) { $ret .= "$addr"; } 49 else { $post=$addr; } 50 } 51 $ret .= "["; 52 53 if ($reg2 ne "") 54 { $idx!=0 or $idx=1; 55 $ret .= "$reg2*$idx"; 56 $ret .= "+$reg1" if ($reg1 ne ""); 57 } 58 else 59 { $ret .= "$reg1"; } 60 61 $ret .= "$post]"; 62 $ret =~ s/\+\]/]/; # in case $addr was the only argument 63 $ret =~ s/\[\s*\]//; 64 65 $ret; 66 } 67 sub ::BP { &get_mem("BYTE",@_); } 68 sub ::DWP { &get_mem("DWORD",@_); } 69 sub ::QWP { &get_mem("QWORD",@_); } 70 sub ::BC { "@_"; } 71 sub ::DWC { "@_"; } 72 73 sub ::file 74 { my $tmp=<<___; 75 TITLE $_[0].asm 76 IF \@Version LT 800 77 ECHO MASM version 8.00 or later is strongly recommended. 78 ENDIF 79 .486 80 .MODEL FLAT 81 OPTION DOTNAME 82 IF \@Version LT 800 83 .text\$ SEGMENT PAGE 'CODE' 84 ELSE 85 .text\$ SEGMENT ALIGN(64) 'CODE' 86 ENDIF 87 ___ 88 push(@out,$tmp); 89 $segment = ".text\$"; 90 } 91 92 sub ::function_begin_B 93 { my $func=shift; 94 my $global=($func !~ /^_/); 95 my $begin="${::lbdecor}_${func}_begin"; 96 97 &::LABEL($func,$global?"$begin":"$nmdecor$func"); 98 $func="ALIGN\t16\n".$nmdecor.$func."\tPROC"; 99 100 if ($global) { $func.=" PUBLIC\n${begin}::\n"; } 101 else { $func.=" PRIVATE\n"; } 102 push(@out,$func); 103 $::stack=4; 104 } 105 sub ::function_end_B 106 { my $func=shift; 107 108 push(@out,"$nmdecor$func ENDP\n"); 109 $::stack=0; 110 &::wipe_labels(); 111 } 112 113 sub ::file_end 114 { my $xmmheader=<<___; 115 .686 116 .XMM 117 IF \@Version LT 800 118 XMMWORD STRUCT 16 119 DQ 2 dup (?) 120 XMMWORD ENDS 121 ENDIF 122 ___ 123 if (grep {/\b[x]?mm[0-7]\b/i} @out) { 124 grep {s/\.[3-7]86/$xmmheader/} @out; 125 } 126 127 push(@out,"$segment ENDS\n"); 128 129 if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) 130 { my $comm=<<___; 131 .bss SEGMENT 'BSS' 132 COMM ${nmdecor}OPENSSL_ia32cap_P:DWORD 133 .bss ENDS 134 ___ 135 # comment out OPENSSL_ia32cap_P declarations 136 grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out; 137 push (@out,$comm); 138 } 139 push (@out,$initseg) if ($initseg); 140 push (@out,"END\n"); 141 } 142 143 sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } } 144 145 *::set_label_B = sub 146 { my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); }; 147 148 sub ::external_label 149 { foreach(@_) 150 { push(@out, "EXTERN\t".&::LABEL($_,$nmdecor.$_).":NEAR\n"); } 151 } 152 153 sub ::public_label 154 { push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 155 156 sub ::data_byte 157 { push(@out,("DB\t").join(',',@_)."\n"); } 158 159 sub ::data_word 160 { push(@out,("DD\t").join(',',@_)."\n"); } 161 162 sub ::align 163 { push(@out,"ALIGN\t$_[0]\n"); } 164 165 sub ::picmeup 166 { my($dst,$sym)=@_; 167 &::lea($dst,&::DWP($sym)); 168 } 169 170 sub ::initseg 171 { my $f=$nmdecor.shift; 172 173 $initseg.=<<___; 174 .CRT\$XCU SEGMENT DWORD PUBLIC 'DATA' 175 EXTERN $f:NEAR 176 DD $f 177 .CRT\$XCU ENDS 178 ___ 179 } 180 181 sub ::dataseg 182 { push(@out,"$segment\tENDS\n_DATA\tSEGMENT\n"); $segment="_DATA"; } 183 184 1; 185
