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 $addr =~ s/^\s+//; 74 # prepend global references with optional underscore 75 $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige; 76 77 $reg1 = "%$reg1" if ($reg1); 78 $reg2 = "%$reg2" if ($reg2); 79 80 $ret .= $addr if (($addr ne "") && ($addr ne 0)); 81 82 if ($reg2) 83 { $idx!= 0 or $idx=1; 84 $ret .= "($reg1,$reg2,$idx)"; 85 } 86 elsif ($reg1) 87 { $ret .= "($reg1)"; } 88 89 $ret; 90} 91sub ::QWP { &::DWP(@_); } 92sub ::BP { &::DWP(@_); } 93sub ::WP { &::DWP(@_); } 94sub ::BC { @_; } 95sub ::DWC { @_; } 96 97sub ::file 98{ push(@out,".file\t\"$_[0].s\"\n.text\n"); } 99 100sub ::function_begin_B 101{ my $func=shift; 102 my $global=($func !~ /^_/); 103 my $begin="${::lbdecor}_${func}_begin"; 104 105 &::LABEL($func,$global?"$begin":"$nmdecor$func"); 106 $func=$nmdecor.$func; 107 108 push(@out,".globl\t$func\n") if ($global); 109 if ($::coff) 110 { push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); } 111 elsif (($::aout and !$::pic) or $::macosx) 112 { } 113 else 114 { push(@out,".type $func,\@function\n"); } 115 push(@out,".align\t$align\n"); 116 push(@out,"$func:\n"); 117 push(@out,"$begin:\n") if ($global); 118 $::stack=4; 119} 120 121sub ::function_end_B 122{ my $func=shift; 123 push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf); 124 $::stack=0; 125 &::wipe_labels(); 126} 127 128sub ::comment 129 { 130 if (!defined($com_start) or $::elf) 131 { # Regarding $::elf above... 132 # GNU and SVR4 as'es use different comment delimiters, 133 push(@out,"\n"); # so we just skip ELF comments... 134 return; 135 } 136 foreach (@_) 137 { 138 if (/^\s*$/) 139 { push(@out,"\n"); } 140 else 141 { push(@out,"\t$com_start $_ $com_end\n"); } 142 } 143 } 144 145sub ::external_label 146{ foreach(@_) { &::LABEL($_,$nmdecor.$_); } } 147 148sub ::public_label 149{ push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 150 151sub ::file_end 152{ if ($::macosx) 153 { if (%non_lazy_ptr) 154 { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n"); 155 foreach $i (keys %non_lazy_ptr) 156 { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); } 157 } 158 } 159 if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) { 160 my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,8"; 161 if ($::macosx) { push (@out,"$tmp,2\n"); } 162 elsif ($::elf) { push (@out,"$tmp,4\n"); } 163 else { push (@out,"$tmp\n"); } 164 } 165 push(@out,$initseg) if ($initseg); 166} 167 168sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); } 169sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); } 170sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); } 171 172sub ::align 173{ my $val=$_[0],$p2,$i; 174 if ($::aout) 175 { for ($p2=0;$val!=0;$val>>=1) { $p2++; } 176 $val=$p2-1; 177 $val.=",0x90"; 178 } 179 push(@out,".align\t$val\n"); 180} 181 182sub ::picmeup 183{ my($dst,$sym,$base,$reflabel)=@_; 184 185 if (($::pic && ($::elf || $::aout)) || $::macosx) 186 { if (!defined($base)) 187 { &::call(&::label("PIC_me_up")); 188 &::set_label("PIC_me_up"); 189 &::blindpop($dst); 190 $base=$dst; 191 $reflabel=&::label("PIC_me_up"); 192 } 193 if ($::macosx) 194 { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr"); 195 &::mov($dst,&::DWP("$indirect-$reflabel",$base)); 196 $non_lazy_ptr{"$nmdecor$sym"}=$indirect; 197 } 198 else 199 { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]", 200 $base)); 201 &::mov($dst,&::DWP("$sym\@GOT",$dst)); 202 } 203 } 204 else 205 { &::lea($dst,&::DWP($sym)); } 206} 207 208sub ::initseg 209{ my $f=$nmdecor.shift; 210 211 if ($::android) 212 { $initseg.=<<___; 213.section .init_array 214.align 4 215.long $f 216___ 217 } 218 elsif ($::elf) 219 { $initseg.=<<___; 220.section .init 221 call $f 222___ 223 } 224 elsif ($::coff) 225 { $initseg.=<<___; # applies to both Cygwin and Mingw 226.section .ctors 227.long $f 228___ 229 } 230 elsif ($::macosx) 231 { $initseg.=<<___; 232.mod_init_func 233.align 2 234.long $f 235___ 236 } 237 elsif ($::aout) 238 { my $ctor="${nmdecor}_GLOBAL_\$I\$$f"; 239 $initseg.=".text\n"; 240 $initseg.=".type $ctor,\@function\n" if ($::pic); 241 $initseg.=<<___; # OpenBSD way... 242.globl $ctor 243.align 2 244$ctor: 245 jmp $f 246___ 247 } 248} 249 250sub ::dataseg 251{ push(@out,".data\n"); } 252 2531; 254