261 lines
6.1 KiB
Perl
261 lines
6.1 KiB
Perl
#!/usr/bin/env perl
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package x86gas;
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*out=\@::out;
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$::lbdecor=$::aout?"L":".L"; # local label decoration
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$nmdecor=($::aout or $::coff)?"_":""; # external name decoration
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$initseg="";
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$align=16;
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$align=log($align)/log(2) if ($::aout);
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$com_start="#" if ($::aout or $::coff);
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sub opsize()
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{ my $reg=shift;
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if ($reg =~ m/^%e/o) { "l"; }
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elsif ($reg =~ m/^%[a-d][hl]$/o) { "b"; }
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elsif ($reg =~ m/^%[xm]/o) { undef; }
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else { "w"; }
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}
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# swap arguments;
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# expand opcode with size suffix;
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# prefix numeric constants with $;
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sub ::generic
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{ my($opcode,$dst,$src)=@_;
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my($tmp,$suffix,@arg);
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if (defined($src))
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{ $src =~ s/^(e?[a-dsixphl]{2})$/%$1/o;
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$src =~ s/^(x?mm[0-7])$/%$1/o;
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$src =~ s/^(\-?[0-9]+)$/\$$1/o;
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$src =~ s/^(\-?0x[0-9a-f]+)$/\$$1/o;
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push(@arg,$src);
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}
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if (defined($dst))
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{ $dst =~ s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;
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$dst =~ s/^(x?mm[0-7])$/%$1/o;
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$dst =~ s/^(\-?[0-9]+)$/\$$1/o if(!defined($src));
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$dst =~ s/^(\-?0x[0-9a-f]+)$/\$$1/o if(!defined($src));
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push(@arg,$dst);
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}
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if ($dst =~ m/^%/o) { $suffix=&opsize($dst); }
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elsif ($src =~ m/^%/o) { $suffix=&opsize($src); }
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else { $suffix="l"; }
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undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
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if ($#_==0) { &::emit($opcode); }
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elsif ($opcode =~ m/^j/o && $#_==1) { &::emit($opcode,@arg); }
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elsif ($opcode eq "call" && $#_==1) { &::emit($opcode,@arg); }
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elsif ($opcode =~ m/^set/&& $#_==1) { &::emit($opcode,@arg); }
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else { &::emit($opcode.$suffix,@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 ::movzx { &::movzb(@_); }
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sub ::pushfd { &::pushfl; }
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sub ::popfd { &::popfl; }
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sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); }
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sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); }
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sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
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sub ::call_ptr { &::generic("call","*$_[0]"); }
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sub ::jmp_ptr { &::generic("jmp","*$_[0]"); }
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*::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386);
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*::pshufw = sub
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{ my($dst,$src,$magic)=@_;
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&::emit("pshufw","\$$magic","%$src","%$dst");
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};
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*::shld = sub
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{ my($dst,$src,$bits)=@_;
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&::emit("shldl",$bit eq "cl"?"%cl":"\$$bits","%$src","%$dst");
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};
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*::shrd = sub
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{ my($dst,$src,$bits)=@_;
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&::emit("shrdl",$bit eq "cl"?"%cl":"\$$bits","%$src","%$dst");
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};
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sub ::DWP
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{ my($addr,$reg1,$reg2,$idx)=@_;
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my $ret="";
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$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$1"/ige;
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$reg1 = "%$reg1" if ($reg1);
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$reg2 = "%$reg2" if ($reg2);
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$ret .= $addr if (($addr ne "") && ($addr ne 0));
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if ($reg2)
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{ $idx!= 0 or $idx=1;
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$ret .= "($reg1,$reg2,$idx)";
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}
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elsif ($reg1)
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{ $ret .= "($reg1)"; }
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$ret;
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}
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sub ::QWP { &::DWP(@_); }
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sub ::BP { &::DWP(@_); }
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sub ::BC { @_; }
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sub ::DWC { @_; }
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sub ::file
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{ push(@out,".file\t\"$_[0].s\"\n.text\n"); }
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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.$func;
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push(@out,".globl\t$func\n") if ($global);
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if ($::coff)
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{ push(@out,".def\t$func;\t.scl\t2;\t.type\t32;\t.endef\n"); }
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elsif (($::aout and !$::pic) or $::macosx)
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{ }
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else
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{ push(@out,".type $func,\@function\n"); }
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push(@out,".align\t$align\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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{ my $func=shift;
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push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
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$::stack=0;
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&::wipe_labels();
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}
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sub ::comment
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{
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if (!defined($com_start) or $::elf)
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{ # Regarding $::elf above...
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# GNU and SVR4 as'es use different comment delimiters,
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push(@out,"\n"); # so we just skip ELF comments...
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return;
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}
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foreach (@_)
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{
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if (/^\s*$/)
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{ push(@out,"\n"); }
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else
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{ push(@out,"\t$com_start $_ $com_end\n"); }
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}
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}
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sub ::external_label
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{ foreach(@_) { &::LABEL($_,$nmdecor.$_); } }
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sub ::public_label
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{ push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
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sub ::file_end
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{ if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
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my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,4";
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if ($::elf) { push (@out,"$tmp,4\n"); }
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else { push (@out,"$tmp\n"); }
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}
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if ($::macosx)
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{ if (%non_lazy_ptr)
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{ push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
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foreach $i (keys %non_lazy_ptr)
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{ push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); }
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}
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}
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push(@out,$initseg) if ($initseg);
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}
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sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); }
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sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); }
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sub ::align
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{ my $val=$_[0],$p2,$i;
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if ($::aout)
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{ for ($p2=0;$val!=0;$val>>=1) { $p2++; }
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$val=$p2-1;
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$val.=",0x90";
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}
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push(@out,".align\t$val\n");
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}
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sub ::picmeup
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{ my($dst,$sym,$base,$reflabel)=@_;
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if ($::pic && ($::elf || $::aout))
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{ if (!defined($base))
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{ &::call(&::label("PIC_me_up"));
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&::set_label("PIC_me_up");
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&::blindpop($dst);
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$base=$dst;
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$reflabel=&::label("PIC_me_up");
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}
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if ($::macosx)
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{ my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
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&::mov($dst,&::DWP("$indirect-$reflabel",$base));
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$non_lazy_ptr{"$nmdecor$sym"}=$indirect;
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}
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else
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{ &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
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$base));
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&::mov($dst,&::DWP("$sym\@GOT",$dst));
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}
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}
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else
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{ &::lea($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 ($::elf)
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{ $initseg.=<<___;
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.section .init
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call $f
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jmp .Linitalign
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.align $align
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.Linitalign:
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___
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}
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elsif ($::coff)
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{ $initseg.=<<___; # applies to both Cygwin and Mingw
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.section .ctors
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.long $f
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___
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}
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elsif ($::macosx)
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{ $initseg.=<<___;
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.mod_init_func
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.align 2
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.long $f
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___
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}
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elsif ($::aout)
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{ my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
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$initseg.=".text\n";
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$initseg.=".type $ctor,\@function\n" if ($::pic);
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$initseg.=<<___; # OpenBSD way...
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.globl $ctor
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.align 2
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$ctor:
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jmp $f
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___
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}
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}
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1;
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