1#!/usr/bin/env perl 2 3package 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 16sub 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 $; 27sub ::generic 28{ my($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# 57sub ::movzx { &::movzb(@_); } 58sub ::pushfd { &::pushfl; } 59sub ::popfd { &::popfl; } 60sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); } 61sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); } 62 63sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 64sub ::call_ptr { &::generic("call","*$_[0]"); } 65sub ::jmp_ptr { &::generic("jmp","*$_[0]"); } 66 67*::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386); 68 69sub ::DWP 70{ my($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 $ret; 92} 93sub ::QWP { &::DWP(@_); } 94sub ::BP { &::DWP(@_); } 95sub ::WP { &::DWP(@_); } 96sub ::BC { @_; } 97sub ::DWC { @_; } 98 99sub ::file 100{ push(@out,".file\t\"$_[0].s\"\n.text\n"); } 101 102sub ::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 ($global); 111 if ($::coff) 112 { push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); } 113 elsif (($::aout and !$::pic) or $::macosx) 114 { } 115 else 116 { push(@out,".type $func,\@function\n"); } 117 push(@out,".align\t$align\n"); 118 push(@out,"$func:\n"); 119 push(@out,"$begin:\n") if ($global); 120 $::stack=4; 121} 122 123sub ::function_end_B 124{ my $func=shift; 125 push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf); 126 $::stack=0; 127 &::wipe_labels(); 128} 129 130sub ::comment 131 { 132 if (!defined($com_start) or $::elf) 133 { # Regarding $::elf above... 134 # GNU and SVR4 as'es use different comment delimiters, 135 push(@out,"\n"); # so we just skip ELF comments... 136 return; 137 } 138 foreach (@_) 139 { 140 if (/^\s*$/) 141 { push(@out,"\n"); } 142 else 143 { push(@out,"\t$com_start $_ $com_end\n"); } 144 } 145 } 146 147sub ::external_label 148{ foreach(@_) { &::LABEL($_,$nmdecor.$_); } } 149 150sub ::public_label 151{ push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 152 153sub ::file_end 154{ if ($::macosx) 155 { if (%non_lazy_ptr) 156 { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n"); 157 foreach $i (keys %non_lazy_ptr) 158 { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); } 159 } 160 } 161 if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) { 162 my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16"; 163 if ($::macosx) { push (@out,"$tmp,2\n"); } 164 elsif ($::elf) { push (@out,"$tmp,4\n"); } 165 else { push (@out,"$tmp\n"); } 166 } 167 push(@out,$initseg) if ($initseg); 168} 169 170sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); } 171sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); } 172sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); } 173 174sub ::align 175{ my $val=$_[0]; 176 if ($::aout) 177 { $val=int(log($val)/log(2)); 178 $val.=",0x90"; 179 } 180 push(@out,".align\t$val\n"); 181} 182 183sub ::picmeup 184{ my($dst,$sym,$base,$reflabel)=@_; 185 186 if (($::pic && ($::elf || $::aout)) || $::macosx) 187 { if (!defined($base)) 188 { &::call(&::label("PIC_me_up")); 189 &::set_label("PIC_me_up"); 190 &::blindpop($dst); 191 $base=$dst; 192 $reflabel=&::label("PIC_me_up"); 193 } 194 if ($::macosx) 195 { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr"); 196 &::mov($dst,&::DWP("$indirect-$reflabel",$base)); 197 $non_lazy_ptr{"$nmdecor$sym"}=$indirect; 198 } 199 elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0) 200 { &::lea($dst,&::DWP("$sym-$reflabel",$base)); } 201 else 202 { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]", 203 $base)); 204 &::mov($dst,&::DWP("$sym\@GOT",$dst)); 205 } 206 } 207 else 208 { &::lea($dst,&::DWP($sym)); } 209} 210 211sub ::initseg 212{ my $f=$nmdecor.shift; 213 214 if ($::android) 215 { $initseg.=<<___; 216.section .init_array 217.align 4 218.long $f 219___ 220 } 221 elsif ($::elf) 222 { $initseg.=<<___; 223.section .init 224 call $f 225___ 226 } 227 elsif ($::coff) 228 { $initseg.=<<___; # applies to both Cygwin and Mingw 229.section .ctors 230.long $f 231___ 232 } 233 elsif ($::macosx) 234 { $initseg.=<<___; 235.mod_init_func 236.align 2 237.long $f 238___ 239 } 240 elsif ($::aout) 241 { my $ctor="${nmdecor}_GLOBAL_\$I\$$f"; 242 $initseg.=".text\n"; 243 $initseg.=".type $ctor,\@function\n" if ($::pic); 244 $initseg.=<<___; # OpenBSD way... 245.globl $ctor 246.align 2 247$ctor: 248 jmp $f 249___ 250 } 251} 252 253sub ::dataseg 254{ push(@out,".data\n"); } 255 256*::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf); 257 2581; 259