180 lines
4.1 KiB
Perl
180 lines
4.1 KiB
Perl
#!/usr/bin/env perl
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package x86nasm;
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*out=\@::out;
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$::lbdecor="L\$"; # local label decoration
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$nmdecor=$::netware?"":"_"; # external name decoration
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$drdecor=$::mwerks?".":""; # directive decoration
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$initseg="";
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sub ::generic
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{ my $opcode=shift;
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my $tmp;
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if (!$::mwerks)
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{ if ($opcode =~ m/^j/o && $#_==0) # optimize jumps
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{ $_[0] = "NEAR $_[0]"; }
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elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea
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{ $_[1] =~ s/^[^\[]*\[/\[/o; }
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elsif ($opcode eq "clflush" && $#_==0)
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{ $_[0] =~ s/^[^\[]*\[/\[/o; }
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}
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&::emit($opcode,@_);
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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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if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
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if ($size ne "")
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{ $ret .= "$size";
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$ret .= " PTR" if ($::mwerks);
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$ret .= " ";
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}
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$ret .= "[";
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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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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;
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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 ::WP { &get_mem("WORD",@_); }
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sub ::QWP { &get_mem("",@_); }
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sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; }
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sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; }
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sub ::file
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{ if ($::mwerks) { push(@out,".section\t.text,64\n"); }
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else
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{ my $tmp=<<___;
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%ifidn __OUTPUT_FORMAT__,obj
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section code use32 class=code align=64
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%elifidn __OUTPUT_FORMAT__,win32
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\$\@feat.00 equ 1
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section .text code align=64
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%else
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section .text code
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%endif
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___
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push(@out,$tmp);
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}
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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}_${func}_begin";
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$begin =~ s/^\@/./ if ($::mwerks); # the torture never stops
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&::LABEL($func,$global?"$begin":"$nmdecor$func");
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$func=$nmdecor.$func;
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push(@out,"${drdecor}global $func\n") if ($global);
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push(@out,"${drdecor}align 16\n");
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push(@out,"$func:\n");
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push(@out,"$begin:\n") if ($global);
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$::stack=4;
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}
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sub ::function_end_B
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{ $::stack=0;
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&::wipe_labels();
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}
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sub ::file_end
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{ if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out)
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{ my $comm=<<___;
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${drdecor}segment .bss
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${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 16
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___
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# comment out OPENSSL_ia32cap_P declarations
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grep {s/(^extern\s+${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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}
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sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } }
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sub ::external_label
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{ foreach(@_)
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{ push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); }
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}
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sub ::public_label
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{ push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
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sub ::data_byte
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{ push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); }
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sub ::data_short
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{ push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); }
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sub ::data_word
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{ push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); }
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sub ::align
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{ push(@out,"${drdecor}align\t$_[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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if ($::win32)
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{ $initseg=<<___;
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segment .CRT\$XCU data align=4
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extern $f
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dd $f
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___
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}
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}
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sub ::dataseg
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{ if ($mwerks) { push(@out,".section\t.data,4\n"); }
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else { push(@out,"section\t.data align=4\n"); }
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}
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sub ::safeseh
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{ my $nm=shift;
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push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n");
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push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n");
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push(@out,"%endif\n");
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}
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1;
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