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      1 #!/usr/bin/env perl
      2 
      3 package x86gas;
      4 
      5 *out=\@::out;
      6 
      7 $::lbdecor=$::aout?"L":".L";		# local label decoration
      8 $nmdecor=($::aout or $::coff)?"_":"";	# external name decoration
      9 
     10 $initseg="";
     11 
     12 $align=16;
     13 $align=log($align)/log(2) if ($::aout);
     14 $com_start="#" if ($::aout or $::coff);
     15 
     16 sub opsize()
     17 { my $reg=shift;
     18     if    ($reg =~ m/^%e/o)		{ "l"; }
     19     elsif ($reg =~ m/^%[a-d][hl]$/o)	{ "b"; }
     20     elsif ($reg =~ m/^%[xm]/o)		{ undef; }
     21     else				{ "w"; }
     22 }
     23 
     24 # swap arguments;
     25 # expand opcode with size suffix;
     26 # prefix numeric constants with $;
     27 sub ::generic
     28 { my($opcode,@arg)=@_;
     29   my($suffix,$dst,$src);
     30 
     31     @arg=reverse(@arg);
     32 
     33     for (@arg)
     34     {	s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o;	# gp registers
     35 	s/^([xy]?mm[0-7])$/%$1/o;		# xmm/mmx registers
     36 	s/^(\-?[0-9]+)$/\$$1/o;			# constants
     37 	s/^(\-?0x[0-9a-f]+)$/\$$1/o;		# constants
     38     }
     39 
     40     $dst = $arg[$#arg]		if ($#arg>=0);
     41     $src = $arg[$#arg-1]	if ($#arg>=1);
     42     if    ($dst =~ m/^%/o)	{ $suffix=&opsize($dst); }
     43     elsif ($src =~ m/^%/o)	{ $suffix=&opsize($src); }
     44     else			{ $suffix="l";           }
     45     undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
     46 
     47     if ($#_==0)				{ &::emit($opcode);		}
     48     elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
     49 					{ &::emit($opcode,@arg);	}
     50     else				{ &::emit($opcode.$suffix,@arg);}
     51 
     52   1;
     53 }
     54 #
     55 # opcodes not covered by ::generic above, mostly inconsistent namings...
     56 #
     57 sub ::movzx	{ &::movzb(@_);			}
     58 sub ::pushfd	{ &::pushfl;			}
     59 sub ::popfd	{ &::popfl;			}
     60 sub ::cpuid	{ &::emit(".byte\t0x0f,0xa2");	}
     61 sub ::rdtsc	{ &::emit(".byte\t0x0f,0x31");	}
     62 
     63 sub ::call	{ &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
     64 sub ::call_ptr	{ &::generic("call","*$_[0]");	}
     65 sub ::jmp_ptr	{ &::generic("jmp","*$_[0]");	}
     66 
     67 *::bswap = sub	{ &::emit("bswap","%$_[0]");	} if (!$::i386);
     68 
     69 sub ::DWP
     70 { my($addr,$reg1,$reg2,$idx)=@_;
     71   my $ret="";
     72 
     73     if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
     74 
     75     $addr =~ s/^\s+//;
     76     # prepend global references with optional underscore
     77     $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
     78 
     79     $reg1 = "%$reg1" if ($reg1);
     80     $reg2 = "%$reg2" if ($reg2);
     81 
     82     $ret .= $addr if (($addr ne "") && ($addr ne 0));
     83 
     84     if ($reg2)
     85     {	$idx!= 0 or $idx=1;
     86 	$ret .= "($reg1,$reg2,$idx)";
     87     }
     88     elsif ($reg1)
     89     {	$ret .= "($reg1)";	}
     90 
     91   $ret;
     92 }
     93 sub ::QWP	{ &::DWP(@_);	}
     94 sub ::BP	{ &::DWP(@_);	}
     95 sub ::WP	{ &::DWP(@_);	}
     96 sub ::BC	{ @_;		}
     97 sub ::DWC	{ @_;		}
     98 
     99 sub ::file
    100 {   push(@out,".file\t\"$_[0].S\"\n.text\n");	}
    101 
    102 sub ::function_begin_B
    103 { my $func=shift;
    104   my $global=($func !~ /^_/);
    105   my $begin="${::lbdecor}_${func}_begin";
    106 
    107     &::LABEL($func,$global?"$begin":"$nmdecor$func");
    108     $func=$nmdecor.$func;
    109 
    110     push(@out,".globl\t$func\n")	if ($global);
    111     if ($::macosx) {
    112       push(@out,".private_extern\t$func\n");
    113     } else {
    114       push(@out,".hidden\t$func\n");
    115     }
    116     if ($::coff)
    117     {	push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
    118     elsif (($::aout and !$::pic) or $::macosx)
    119     { }
    120     else
    121     {	push(@out,".type	$func,\@function\n"); }
    122     push(@out,".align\t$align\n");
    123     push(@out,"$func:\n");
    124     push(@out,"$begin:\n")		if ($global);
    125     $::stack=4;
    126 }
    127 
    128 sub ::function_end_B
    129 { my $func=shift;
    130     push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
    131     $::stack=0;
    132     &::wipe_labels();
    133 }
    134 
    135 sub ::comment
    136 	{
    137 	if (!defined($com_start) or $::elf)
    138 		{	# Regarding $::elf above...
    139 			# GNU and SVR4 as'es use different comment delimiters,
    140 		push(@out,"\n");	# so we just skip ELF comments...
    141 		return;
    142 		}
    143 	foreach (@_)
    144 		{
    145 		if (/^\s*$/)
    146 			{ push(@out,"\n"); }
    147 		else
    148 			{ push(@out,"\t$com_start $_ $com_end\n"); }
    149 		}
    150 	}
    151 
    152 sub ::external_label
    153 {   foreach(@_) { &::LABEL($_,$nmdecor.$_); }   }
    154 
    155 sub ::public_label
    156 {   push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n");   }
    157 
    158 sub ::file_end
    159 {   if ($::macosx)
    160     {	if (%non_lazy_ptr)
    161     	{   push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
    162 	    foreach $i (keys %non_lazy_ptr)
    163 	    {	push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n");   }
    164 	}
    165     }
    166     if (0 && grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
    167 	my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
    168 	if ($::macosx)	{ push (@out,"$tmp,2\n"); }
    169 	elsif ($::elf)	{ push (@out,"$tmp,4\n"); }
    170 	else		{ push (@out,"$tmp\n"); }
    171     }
    172     push(@out,$initseg) if ($initseg);
    173 }
    174 
    175 sub ::data_byte	{   push(@out,".byte\t".join(',',@_)."\n");   }
    176 sub ::data_short{   push(@out,".value\t".join(',',@_)."\n");  }
    177 sub ::data_word {   push(@out,".long\t".join(',',@_)."\n");   }
    178 
    179 sub ::align
    180 { my $val=$_[0];
    181     if ($::aout)
    182     {	$val=int(log($val)/log(2));
    183 	$val.=",0x90";
    184     }
    185     push(@out,".align\t$val\n");
    186 }
    187 
    188 sub ::picmeup
    189 { my($dst,$sym,$base,$reflabel)=@_;
    190 
    191     if (($::pic && ($::elf || $::aout)) || $::macosx)
    192     {	if (!defined($base))
    193 	{   &::call(&::label("PIC_me_up"));
    194 	    &::set_label("PIC_me_up");
    195 	    &::blindpop($dst);
    196 	    $base=$dst;
    197 	    $reflabel=&::label("PIC_me_up");
    198 	}
    199 	if ($::macosx)
    200 	{   my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
    201 	    &::mov($dst,&::DWP("$indirect-$reflabel",$base));
    202 	    $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
    203 	}
    204 	elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
    205 	{   &::lea($dst,&::DWP("$sym-$reflabel",$base));   }
    206 	else
    207 	{   &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
    208 			    $base));
    209 	    &::mov($dst,&::DWP("$sym\@GOT",$dst));
    210 	}
    211     }
    212     else
    213     {	&::lea($dst,&::DWP($sym));	}
    214 }
    215 
    216 sub ::initseg
    217 { my $f=$nmdecor.shift;
    218 
    219     if ($::android)
    220     {	$initseg.=<<___;
    221 .section	.init_array
    222 .align	4
    223 .long	$f
    224 ___
    225     }
    226     elsif ($::elf)
    227     {	$initseg.=<<___;
    228 .section	.init
    229 	call	$f
    230 ___
    231     }
    232     elsif ($::coff)
    233     {   $initseg.=<<___;	# applies to both Cygwin and Mingw
    234 .section	.ctors
    235 .long	$f
    236 ___
    237     }
    238     elsif ($::macosx)
    239     {	$initseg.=<<___;
    240 .mod_init_func
    241 .align 2
    242 .long   $f
    243 ___
    244     }
    245     elsif ($::aout)
    246     {	my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
    247 	$initseg.=".text\n";
    248 	$initseg.=".type	$ctor,\@function\n" if ($::pic);
    249 	$initseg.=<<___;	# OpenBSD way...
    250 .globl	$ctor
    251 .align	2
    252 $ctor:
    253 	jmp	$f
    254 ___
    255     }
    256 }
    257 
    258 sub ::dataseg
    259 {   push(@out,".data\n");   }
    260 
    261 *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
    262 
    263 1;
    264