165 lines
3.4 KiB
Perl
165 lines
3.4 KiB
Perl
#!/usr/bin/env perl
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package x86masm;
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*out=\@::out;
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$::lbdecor="\$L"; # local label decoration
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$nmdecor="_"; # external name decoration
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$initseg="";
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sub ::generic
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{ my ($opcode,@arg)=@_;
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# fix hexadecimal constants
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$arg[0] =~ s/0x([0-9a-f]+)/0$1h/oi if (defined($arg[0]));
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$arg[1] =~ s/0x([0-9a-f]+)/0$1h/oi if (defined($arg[1]));
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&::emit($opcode,@arg);
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1;
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}
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#
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# opcodes not covered by ::generic above, mostly inconsistent namings...
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#
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sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
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sub ::call_ptr { &::emit("call",@_); }
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sub ::jmp_ptr { &::emit("jmp",@_); }
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sub get_mem
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{ my($size,$addr,$reg1,$reg2,$idx)=@_;
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my($post,$ret);
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$ret .= "$size PTR " if ($size ne "");
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$addr =~ s/^\s+//;
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# prepend global references with optional underscore
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$addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
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# put address arithmetic expression in parenthesis
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$addr="($addr)" if ($addr =~ /^.+[\-\+].+$/);
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if (($addr ne "") && ($addr ne 0))
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{ if ($addr !~ /^-/) { $ret .= "$addr"; }
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else { $post=$addr; }
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}
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$ret .= "[";
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if ($reg2 ne "")
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{ $idx!=0 or $idx=1;
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$ret .= "$reg2*$idx";
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$ret .= "+$reg1" if ($reg1 ne "");
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}
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else
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{ $ret .= "$reg1"; }
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$ret .= "$post]";
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$ret =~ s/\+\]/]/; # in case $addr was the only argument
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$ret =~ s/\[\s*\]//;
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$ret;
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}
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sub ::BP { &get_mem("BYTE",@_); }
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sub ::DWP { &get_mem("DWORD",@_); }
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sub ::QWP { &get_mem("QWORD",@_); }
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sub ::BC { "@_"; }
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sub ::DWC { "@_"; }
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sub ::file
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{ my $tmp=<<___;
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TITLE $_[0].asm
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.486
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.MODEL FLAT
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OPTION DOTNAME
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.TEXT\$ SEGMENT PAGE 'CODE'
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___
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push(@out,$tmp);
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}
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sub ::function_begin_B
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{ my $func=shift;
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my $global=($func !~ /^_/);
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my $begin="${::lbdecor}_${func}_begin";
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&::LABEL($func,$global?"$begin":"$nmdecor$func");
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$func=$nmdecor.$func."\tPROC";
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if ($global) { $func.=" PUBLIC\n${begin}::\n"; }
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else { $func.=" PRIVATE\n"; }
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push(@out,$func);
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$::stack=4;
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}
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sub ::function_end_B
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{ my $func=shift;
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push(@out,"$nmdecor$func ENDP\n");
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$::stack=0;
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&::wipe_labels();
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}
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sub ::file_end
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{ my $xmmheader=<<___;
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.686
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.XMM
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IF \@Version LT 800
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XMMWORD STRUCT 16
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DQ 2 dup (?)
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XMMWORD ENDS
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ENDIF
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___
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if (grep {/\b[x]?mm[0-7]\b/i} @out) {
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grep {s/\.[3-7]86/$xmmheader/} @out;
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}
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push(@out,".TEXT\$ ENDS\n");
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if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
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{ my $comm=<<___;
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_DATA SEGMENT
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COMM ${nmdecor}OPENSSL_ia32cap_P:DWORD
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_DATA ENDS
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___
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# comment out OPENSSL_ia32cap_P declarations
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grep {s/(^EXTERN\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out;
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push (@out,$comm);
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}
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push (@out,$initseg) if ($initseg);
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push (@out,"END\n");
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}
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sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
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*::set_label_B = sub
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{ my $l=shift; push(@out,$l.($l=~/^\Q${::lbdecor}\E[0-9]{3}/?":\n":"::\n")); };
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sub ::external_label
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{ push(@out, "EXTERN\t".&::LABEL($_[0],$nmdecor.$_[0]).":NEAR\n"); }
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sub ::public_label
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{ push(@out,"PUBLIC\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
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sub ::data_byte
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{ push(@out,("DB\t").join(',',@_)."\n"); }
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sub ::data_word
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{ push(@out,("DD\t").join(',',@_)."\n"); }
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sub ::align
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{ push(@out,"ALIGN\t$_[0]\n"); }
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sub ::picmeup
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{ my($dst,$sym)=@_;
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&::lea($dst,&::DWP($sym));
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}
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sub ::initseg
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{ my $f=$nmdecor.shift;
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$initseg.=<<___;
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.CRT\$XCU SEGMENT DWORD PUBLIC DATA
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EXTERN $f:NEAR
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DD $f
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.CRT\$XCU ENDS
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___
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}
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1;
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