1 #!/usr/bin/env perl 2 3 package x86nasm; 4 5 *out=\@::out; 6 7 $::lbdecor="L\$"; # local label decoration 8 $nmdecor=$::netware?"":"_"; # external name decoration 9 $drdecor=$::mwerks?".":""; # directive decoration 10 11 $initseg=""; 12 13 sub ::generic 14 { my $opcode=shift; 15 my $tmp; 16 17 if (!$::mwerks) 18 { if ($opcode =~ m/^j/o && $#_==0) # optimize jumps 19 { $_[0] = "NEAR $_[0]"; } 20 elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea 21 { $_[1] =~ s/^[^\[]*\[/\[/o; } 22 elsif ($opcode eq "clflush" && $#_==0) 23 { $_[0] =~ s/^[^\[]*\[/\[/o; } 24 } 25 &::emit($opcode,@_); 26 1; 27 } 28 # 29 # opcodes not covered by ::generic above, mostly inconsistent namings... 30 # 31 sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 32 sub ::call_ptr { &::emit("call",@_); } 33 sub ::jmp_ptr { &::emit("jmp",@_); } 34 35 sub get_mem 36 { my($size,$addr,$reg1,$reg2,$idx)=@_; 37 my($post,$ret); 38 39 if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; } 40 41 if ($size ne "") 42 { $ret .= "$size"; 43 $ret .= " PTR" if ($::mwerks); 44 $ret .= " "; 45 } 46 $ret .= "["; 47 48 $addr =~ s/^\s+//; 49 # prepend global references with optional underscore 50 $addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige; 51 # put address arithmetic expression in parenthesis 52 $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/); 53 54 if (($addr ne "") && ($addr ne 0)) 55 { if ($addr !~ /^-/) { $ret .= "$addr+"; } 56 else { $post=$addr; } 57 } 58 59 if ($reg2 ne "") 60 { $idx!=0 or $idx=1; 61 $ret .= "$reg2*$idx"; 62 $ret .= "+$reg1" if ($reg1 ne ""); 63 } 64 else 65 { $ret .= "$reg1"; } 66 67 $ret .= "$post]"; 68 $ret =~ s/\+\]/]/; # in case $addr was the only argument 69 70 $ret; 71 } 72 sub ::BP { &get_mem("BYTE",@_); } 73 sub ::DWP { &get_mem("DWORD",@_); } 74 sub ::WP { &get_mem("WORD",@_); } 75 sub ::QWP { &get_mem("",@_); } 76 sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; } 77 sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; } 78 79 sub ::file 80 { if ($::mwerks) { push(@out,".section\t.text,64\n"); } 81 else 82 { my $tmp=<<___; 83 %ifidn __OUTPUT_FORMAT__,obj 84 section code use32 class=code align=64 85 %elifidn __OUTPUT_FORMAT__,win32 86 \$\@feat.00 equ 1 87 section .text code align=64 88 %else 89 section .text code 90 %endif 91 ___ 92 push(@out,$tmp); 93 } 94 } 95 96 sub ::function_begin_B 97 { my $func=shift; 98 my $global=($func !~ /^_/); 99 my $begin="${::lbdecor}_${func}_begin"; 100 101 $begin =~ s/^\@/./ if ($::mwerks); # the torture never stops 102 103 &::LABEL($func,$global?"$begin":"$nmdecor$func"); 104 $func=$nmdecor.$func; 105 106 push(@out,"${drdecor}global $func\n") if ($global); 107 push(@out,"${drdecor}align 16\n"); 108 push(@out,"$func:\n"); 109 push(@out,"$begin:\n") if ($global); 110 $::stack=4; 111 } 112 113 sub ::function_end_B 114 { $::stack=0; 115 &::wipe_labels(); 116 } 117 118 sub ::file_end 119 { if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) 120 { my $comm=<<___; 121 ${drdecor}segment .bss 122 ${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 16 123 ___ 124 # comment out OPENSSL_ia32cap_P declarations 125 grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out; 126 push (@out,$comm) 127 } 128 push (@out,$initseg) if ($initseg); 129 } 130 131 sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } } 132 133 sub ::external_label 134 { foreach(@_) 135 { push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); } 136 } 137 138 sub ::public_label 139 { push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 140 141 sub ::data_byte 142 { push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); } 143 sub ::data_short 144 { push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); } 145 sub ::data_word 146 { push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); } 147 148 sub ::align 149 { push(@out,"${drdecor}align\t$_[0]\n"); } 150 151 sub ::picmeup 152 { my($dst,$sym)=@_; 153 &::lea($dst,&::DWP($sym)); 154 } 155 156 sub ::initseg 157 { my $f=$nmdecor.shift; 158 if ($::win32) 159 { $initseg=<<___; 160 segment .CRT\$XCU data align=4 161 extern $f 162 dd $f 163 ___ 164 } 165 } 166 167 sub ::dataseg 168 { if ($mwerks) { push(@out,".section\t.data,4\n"); } 169 else { push(@out,"section\t.data align=4\n"); } 170 } 171 172 sub ::safeseh 173 { my $nm=shift; 174 push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n"); 175 push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n"); 176 push(@out,"%endif\n"); 177 } 178 179 1; 180
