1 #! /usr/bin/env perl 2 # Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved. 3 # 4 # Licensed under the OpenSSL license (the "License"). You may not use 5 # this file except in compliance with the License. You can obtain a copy 6 # in the file LICENSE in the source distribution or at 7 # https://www.openssl.org/source/license.html 8 9 10 package x86gas; 11 12 *out=\@::out; 13 14 $::lbdecor=$::aout?"L":".L"; # local label decoration 15 $nmdecor=($::aout or $::coff)?"_":""; # external name decoration 16 17 $initseg=""; 18 19 $align=16; 20 $align=log($align)/log(2) if ($::aout); 21 $com_start="#" if ($::aout or $::coff); 22 23 sub opsize() 24 { my $reg=shift; 25 if ($reg =~ m/^%e/o) { "l"; } 26 elsif ($reg =~ m/^%[a-d][hl]$/o) { "b"; } 27 elsif ($reg =~ m/^%[yxm]/o) { undef; } 28 else { "w"; } 29 } 30 31 # swap arguments; 32 # expand opcode with size suffix; 33 # prefix numeric constants with $; 34 sub ::generic 35 { my($opcode,@arg)=@_; 36 my($suffix,$dst,$src); 37 38 @arg=reverse(@arg); 39 40 for (@arg) 41 { s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o; # gp registers 42 s/^([xy]?mm[0-7])$/%$1/o; # xmm/mmx registers 43 s/^(\-?[0-9]+)$/\$$1/o; # constants 44 s/^(\-?0x[0-9a-f]+)$/\$$1/o; # constants 45 } 46 47 $dst = $arg[$#arg] if ($#arg>=0); 48 $src = $arg[$#arg-1] if ($#arg>=1); 49 if ($dst =~ m/^%/o) { $suffix=&opsize($dst); } 50 elsif ($src =~ m/^%/o) { $suffix=&opsize($src); } 51 else { $suffix="l"; } 52 undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o); 53 54 if ($#_==0) { &::emit($opcode); } 55 elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o) 56 { &::emit($opcode,@arg); } 57 else { &::emit($opcode.$suffix,@arg);} 58 59 1; 60 } 61 # 62 # opcodes not covered by ::generic above, mostly inconsistent namings... 63 # 64 sub ::movzx { &::movzb(@_); } 65 sub ::pushfd { &::pushfl; } 66 sub ::popfd { &::popfl; } 67 sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); } 68 sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); } 69 70 sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 71 sub ::call_ptr { &::generic("call","*$_[0]"); } 72 sub ::jmp_ptr { &::generic("jmp","*$_[0]"); } 73 74 *::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386); 75 76 sub ::DWP 77 { my($addr,$reg1,$reg2,$idx)=@_; 78 my $ret=""; 79 80 if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; } 81 82 $addr =~ s/^\s+//; 83 # prepend global references with optional underscore 84 $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige; 85 86 $reg1 = "%$reg1" if ($reg1); 87 $reg2 = "%$reg2" if ($reg2); 88 89 $ret .= $addr if (($addr ne "") && ($addr ne 0)); 90 91 if ($reg2) 92 { $idx!= 0 or $idx=1; 93 $ret .= "($reg1,$reg2,$idx)"; 94 } 95 elsif ($reg1) 96 { $ret .= "($reg1)"; } 97 98 $ret; 99 } 100 sub ::QWP { &::DWP(@_); } 101 sub ::BP { &::DWP(@_); } 102 sub ::WP { &::DWP(@_); } 103 sub ::BC { @_; } 104 sub ::DWC { @_; } 105 106 sub ::file 107 { push(@out,".file\t\"$_[0].S\"\n.text\n"); } 108 109 sub ::function_begin_B 110 { my $func=shift; 111 my $global=($func !~ /^_/); 112 my $begin="${::lbdecor}_${func}_begin"; 113 114 &::LABEL($func,$global?"$begin":"$nmdecor$func"); 115 $func=$nmdecor.$func; 116 117 push(@out,".globl\t$func\n") if ($global); 118 if ($::macosx) { 119 push(@out,".private_extern\t$func\n"); 120 } else { 121 push(@out,".hidden\t$func\n"); 122 } 123 if ($::coff) 124 { push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); } 125 elsif (($::aout and !$::pic) or $::macosx) 126 { } 127 else 128 { push(@out,".type $func,\@function\n"); } 129 push(@out,".align\t$align\n"); 130 push(@out,"$func:\n"); 131 push(@out,"$begin:\n") if ($global); 132 $::stack=4; 133 } 134 135 sub ::function_end_B 136 { my $func=shift; 137 push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf); 138 $::stack=0; 139 &::wipe_labels(); 140 } 141 142 sub ::comment 143 { 144 if (!defined($com_start) or $::elf) 145 { # Regarding $::elf above... 146 # GNU and SVR4 as'es use different comment delimiters, 147 push(@out,"\n"); # so we just skip ELF comments... 148 return; 149 } 150 foreach (@_) 151 { 152 if (/^\s*$/) 153 { push(@out,"\n"); } 154 else 155 { push(@out,"\t$com_start $_ $com_end\n"); } 156 } 157 } 158 159 sub ::external_label 160 { foreach(@_) { &::LABEL($_,$nmdecor.$_); } } 161 162 sub ::public_label 163 { push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 164 165 sub ::file_end 166 { if ($::macosx) 167 { if (%non_lazy_ptr) 168 { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n"); 169 foreach $i (keys %non_lazy_ptr) 170 { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); } 171 } 172 } 173 if (0 && grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) { 174 my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16"; 175 if ($::macosx) { push (@out,"$tmp,2\n"); } 176 elsif ($::elf) { push (@out,"$tmp,4\n"); } 177 else { push (@out,"$tmp\n"); } 178 } 179 push(@out,$initseg) if ($initseg); 180 } 181 182 sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); } 183 sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); } 184 sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); } 185 186 sub ::align 187 { my $val=$_[0]; 188 if ($::aout) 189 { $val=int(log($val)/log(2)); 190 $val.=",0x90"; 191 } 192 push(@out,".align\t$val\n"); 193 } 194 195 sub ::picmeup 196 { my($dst,$sym,$base,$reflabel)=@_; 197 198 if (($::pic && ($::elf || $::aout)) || $::macosx) 199 { if (!defined($base)) 200 { &::call(&::label("PIC_me_up")); 201 &::set_label("PIC_me_up"); 202 &::blindpop($dst); 203 $base=$dst; 204 $reflabel=&::label("PIC_me_up"); 205 } 206 if ($::macosx) 207 { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr"); 208 &::mov($dst,&::DWP("$indirect-$reflabel",$base)); 209 $non_lazy_ptr{"$nmdecor$sym"}=$indirect; 210 } 211 elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0) 212 { &::lea($dst,&::DWP("$sym-$reflabel",$base)); } 213 else 214 { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]", 215 $base)); 216 &::mov($dst,&::DWP("$sym\@GOT",$dst)); 217 } 218 } 219 else 220 { &::lea($dst,&::DWP($sym)); } 221 } 222 223 sub ::initseg 224 { my $f=$nmdecor.shift; 225 226 if ($::android) 227 { $initseg.=<<___; 228 .section .init_array 229 .align 4 230 .long $f 231 ___ 232 } 233 elsif ($::elf) 234 { $initseg.=<<___; 235 .section .init 236 call $f 237 ___ 238 } 239 elsif ($::coff) 240 { $initseg.=<<___; # applies to both Cygwin and Mingw 241 .section .ctors 242 .long $f 243 ___ 244 } 245 elsif ($::macosx) 246 { $initseg.=<<___; 247 .mod_init_func 248 .align 2 249 .long $f 250 ___ 251 } 252 elsif ($::aout) 253 { my $ctor="${nmdecor}_GLOBAL_\$I\$$f"; 254 $initseg.=".text\n"; 255 $initseg.=".type $ctor,\@function\n" if ($::pic); 256 $initseg.=<<___; # OpenBSD way... 257 .globl $ctor 258 .align 2 259 $ctor: 260 jmp $f 261 ___ 262 } 263 } 264 265 sub ::dataseg 266 { push(@out,".data\n"); } 267 268 *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf); 269 270 1; 271
