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
