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($opcode); } 48 elsif ($opcode =~ m/^j/o && $#_==1) { &::emit($opcode,@arg); } 49 elsif ($opcode eq "call" && $#_==1) { &::emit($opcode,@arg); } 50 elsif ($opcode =~ m/^set/&& $#_==1) { &::emit($opcode,@arg); } 51 else { &::emit($opcode.$suffix,@arg);} 52 53 1; 54 } 55 # 56 # opcodes not covered by ::generic above, mostly inconsistent namings... 57 # 58 sub ::movzx { &::movzb(@_); } 59 sub ::pushfd { &::pushfl; } 60 sub ::popfd { &::popfl; } 61 sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); } 62 sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); } 63 64 sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 65 sub ::call_ptr { &::generic("call","*$_[0]"); } 66 sub ::jmp_ptr { &::generic("jmp","*$_[0]"); } 67 68 *::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386); 69 70 sub ::DWP 71 { my($addr,$reg1,$reg2,$idx)=@_; 72 my $ret=""; 73 74 $addr =~ s/^\s+//; 75 # prepend global references with optional underscore 76 $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige; 77 78 $reg1 = "%$reg1" if ($reg1); 79 $reg2 = "%$reg2" if ($reg2); 80 81 $ret .= $addr if (($addr ne "") && ($addr ne 0)); 82 83 if ($reg2) 84 { $idx!= 0 or $idx=1; 85 $ret .= "($reg1,$reg2,$idx)"; 86 } 87 elsif ($reg1) 88 { $ret .= "($reg1)"; } 89 90 $ret; 91 } 92 sub ::QWP { &::DWP(@_); } 93 sub ::BP { &::DWP(@_); } 94 sub ::BC { @_; } 95 sub ::DWC { @_; } 96 97 sub ::file 98 { push(@out,".file\t\"$_[0].s\"\n.text\n"); } 99 100 sub ::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 } 120 121 sub ::function_end_B 122 { my $func=shift; 123 push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf); 124 $::stack=0; 125 &::wipe_labels(); 126 } 127 128 sub ::comment 129 { 130 if (!defined($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 $_ $com_end\n"); } 142 } 143 } 144 145 sub ::external_label 146 { foreach(@_) { &::LABEL($_,$nmdecor.$_); } } 147 148 sub ::public_label 149 { push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 150 151 sub ::file_end 152 { if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) { 153 my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,4"; 154 if ($::elf) { push (@out,"$tmp,4\n"); } 155 else { push (@out,"$tmp\n"); } 156 } 157 if ($::macosx) 158 { if (%non_lazy_ptr) 159 { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n"); 160 foreach $i (keys %non_lazy_ptr) 161 { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); } 162 } 163 } 164 push(@out,$initseg) if ($initseg); 165 } 166 167 sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); } 168 sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); } 169 170 sub ::align 171 { my $val=$_[0],$p2,$i; 172 if ($::aout) 173 { for ($p2=0;$val!=0;$val>>=1) { $p2++; } 174 $val=$p2-1; 175 $val.=",0x90"; 176 } 177 push(@out,".align\t$val\n"); 178 } 179 180 sub ::picmeup 181 { my($dst,$sym,$base,$reflabel)=@_; 182 183 if ($::pic && ($::elf || $::aout)) 184 { if (!defined($base)) 185 { &::call(&::label("PIC_me_up")); 186 &::set_label("PIC_me_up"); 187 &::blindpop($dst); 188 $base=$dst; 189 $reflabel=&::label("PIC_me_up"); 190 } 191 if ($::macosx) 192 { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr"); 193 &::mov($dst,&::DWP("$indirect-$reflabel",$base)); 194 $non_lazy_ptr{"$nmdecor$sym"}=$indirect; 195 } 196 else 197 { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]", 198 $base)); 199 &::mov($dst,&::DWP("$sym\@GOT",$dst)); 200 } 201 } 202 else 203 { &::lea($dst,&::DWP($sym)); } 204 } 205 206 sub ::initseg 207 { my $f=$nmdecor.shift; 208 209 if ($::elf) 210 { $initseg.=<<___; 211 .section .init 212 call $f 213 jmp .Linitalign 214 .align $align 215 .Linitalign: 216 ___ 217 } 218 elsif ($::coff) 219 { $initseg.=<<___; # applies to both Cygwin and Mingw 220 .section .ctors 221 .long $f 222 ___ 223 } 224 elsif ($::macosx) 225 { $initseg.=<<___; 226 .mod_init_func 227 .align 2 228 .long $f 229 ___ 230 } 231 elsif ($::aout) 232 { my $ctor="${nmdecor}_GLOBAL_\$I\$$f"; 233 $initseg.=".text\n"; 234 $initseg.=".type $ctor,\@function\n" if ($::pic); 235 $initseg.=<<___; # OpenBSD way... 236 .globl $ctor 237 .align 2 238 $ctor: 239 jmp $f 240 ___ 241 } 242 } 243 244 sub ::dataseg 245 { push(@out,".data\n"); } 246 247 1; 248
