| 1 | #! /usr/bin/env perl
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| 2 | # Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | #
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| 4 | # Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | # this file except in compliance with the License. You can obtain a copy
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| 6 | # in the file LICENSE in the source distribution or at
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| 7 | # https://www.openssl.org/source/license.html
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| 8 |
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| 9 |
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| 10 | package x86gas;
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| 11 |
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| 12 | *out=\@::out;
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| 13 |
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| 14 | $::lbdecor=$::aout?"L":".L"; # local label decoration
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| 15 | $nmdecor=($::aout or $::coff)?"_":""; # external name decoration
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| 16 |
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| 17 | $initseg="";
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| 18 |
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| 19 | $align=16;
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| 20 | $align=log($align)/log(2) if ($::aout);
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| 21 | $com_start="#" if ($::aout or $::coff);
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| 22 |
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| 23 | sub opsize()
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| 24 | { my $reg=shift;
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| 25 | if ($reg =~ m/^%e/o) { "l"; }
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| 26 | elsif ($reg =~ m/^%[a-d][hl]$/o) { "b"; }
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| 27 | elsif ($reg =~ m/^%[yxm]/o) { undef; }
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| 28 | else { "w"; }
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| 29 | }
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| 30 |
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| 31 | # swap arguments;
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| 32 | # expand opcode with size suffix;
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| 33 | # prefix numeric constants with $;
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| 34 | sub ::generic
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| 35 | { my($opcode,@arg)=@_;
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| 36 | my($suffix,$dst,$src);
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| 37 |
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| 38 | @arg=reverse(@arg);
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| 39 |
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| 40 | for (@arg)
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| 41 | { s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o; # gp registers
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| 42 | s/^([xy]?mm[0-7])$/%$1/o; # xmm/mmx registers
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| 43 | s/^(\-?[0-9]+)$/\$$1/o; # constants
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| 44 | s/^(\-?0x[0-9a-f]+)$/\$$1/o; # constants
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| 45 | }
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| 46 |
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| 47 | $dst = $arg[$#arg] if ($#arg>=0);
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| 48 | $src = $arg[$#arg-1] if ($#arg>=1);
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| 49 | if ($dst =~ m/^%/o) { $suffix=&opsize($dst); }
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| 50 | elsif ($src =~ m/^%/o) { $suffix=&opsize($src); }
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| 51 | else { $suffix="l"; }
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| 52 | undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
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| 53 |
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| 54 | if ($#_==0) { &::emit($opcode); }
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| 55 | elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
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| 56 | { &::emit($opcode,@arg); }
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| 57 | else { &::emit($opcode.$suffix,@arg);}
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| 58 |
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| 59 | 1;
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| 60 | }
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| 61 | #
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| 62 | # opcodes not covered by ::generic above, mostly inconsistent namings...
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| 63 | #
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| 64 | sub ::movzx { &::movzb(@_); }
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| 65 | sub ::pushfd { &::pushfl; }
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| 66 | sub ::popfd { &::popfl; }
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| 67 | sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); }
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| 68 | sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); }
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| 69 |
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| 70 | sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
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| 71 | sub ::call_ptr { &::generic("call","*$_[0]"); }
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| 72 | sub ::jmp_ptr { &::generic("jmp","*$_[0]"); }
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| 73 |
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| 74 | *::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386);
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| 75 |
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| 76 | sub ::DWP
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| 77 | { my($addr,$reg1,$reg2,$idx)=@_;
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| 78 | my $ret="";
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| 79 |
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| 80 | if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; }
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| 81 |
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| 82 | $addr =~ s/^\s+//;
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| 83 | # prepend global references with optional underscore
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| 84 | $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
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| 85 |
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| 86 | $reg1 = "%$reg1" if ($reg1);
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| 87 | $reg2 = "%$reg2" if ($reg2);
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| 88 |
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| 89 | $ret .= $addr if (($addr ne "") && ($addr ne 0));
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| 90 |
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| 91 | if ($reg2)
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| 92 | { $idx!= 0 or $idx=1;
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| 93 | $ret .= "($reg1,$reg2,$idx)";
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| 94 | }
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| 95 | elsif ($reg1)
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| 96 | { $ret .= "($reg1)"; }
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| 97 |
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| 98 | $ret;
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| 99 | }
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| 100 | sub ::QWP { &::DWP(@_); }
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| 101 | sub ::BP { &::DWP(@_); }
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| 102 | sub ::WP { &::DWP(@_); }
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| 103 | sub ::BC { @_; }
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| 104 | sub ::DWC { @_; }
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| 105 |
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| 106 | sub ::file
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| 107 | { push(@out,".text\n"); }
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| 108 |
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| 109 | sub ::function_begin_B
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| 110 | { my $func=shift;
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| 111 | my $global=($func !~ /^_/);
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| 112 | my $begin="${::lbdecor}_${func}_begin";
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| 113 |
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| 114 | &::LABEL($func,$global?"$begin":"$nmdecor$func");
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| 115 | $func=$nmdecor.$func;
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| 116 |
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| 117 | push(@out,".globl\t$func\n") if ($global);
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| 118 | if ($::coff)
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| 119 | { push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
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| 120 | elsif (($::aout and !$::pic) or $::macosx)
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| 121 | { }
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| 122 | else
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| 123 | { push(@out,".type $func,\@function\n"); }
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| 124 | push(@out,".align\t$align\n");
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| 125 | push(@out,"$func:\n");
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| 126 | push(@out,"$begin:\n") if ($global);
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| 127 | &::endbranch();
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| 128 | $::stack=4;
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| 129 | }
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| 130 |
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| 131 | sub ::function_end_B
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| 132 | { my $func=shift;
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| 133 | push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
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| 134 | $::stack=0;
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| 135 | &::wipe_labels();
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| 136 | }
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| 137 |
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| 138 | sub ::comment
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| 139 | {
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| 140 | if (!defined($com_start) or $::elf)
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| 141 | { # Regarding $::elf above...
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| 142 | # GNU and SVR4 as'es use different comment delimiters,
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| 143 | push(@out,"\n"); # so we just skip ELF comments...
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| 144 | return;
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| 145 | }
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| 146 | foreach (@_)
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| 147 | {
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| 148 | if (/^\s*$/)
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| 149 | { push(@out,"\n"); }
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| 150 | else
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| 151 | { push(@out,"\t$com_start $_ $com_end\n"); }
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| 152 | }
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| 153 | }
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| 154 |
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| 155 | sub ::external_label
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| 156 | { foreach(@_) { &::LABEL($_,$nmdecor.$_); } }
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| 157 |
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| 158 | sub ::public_label
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| 159 | { push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
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| 160 |
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| 161 | sub ::file_end
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| 162 | { if ($::macosx)
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| 163 | { if (%non_lazy_ptr)
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| 164 | { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
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| 165 | foreach $i (keys %non_lazy_ptr)
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| 166 | { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); }
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| 167 | }
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| 168 | }
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| 169 | if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
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| 170 | my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,16";
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| 171 | if ($::macosx) { push (@out,"$tmp,2\n"); }
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| 172 | elsif ($::elf) { push (@out,"$tmp,4\n"); }
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| 173 | else { push (@out,"$tmp\n"); }
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| 174 | }
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| 175 | push(@out,$initseg) if ($initseg);
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| 176 | if ($::elf) {
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| 177 | push(@out,"
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| 178 | .section \".note.gnu.property\", \"a\"
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| 179 | .p2align 2
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| 180 | .long 1f - 0f
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| 181 | .long 4f - 1f
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| 182 | .long 5
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| 183 | 0:
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| 184 | .asciz \"GNU\"
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| 185 | 1:
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| 186 | .p2align 2
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| 187 | .long 0xc0000002
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| 188 | .long 3f - 2f
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| 189 | 2:
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| 190 | .long 3
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| 191 | 3:
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| 192 | .p2align 2
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| 193 | 4:
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| 194 | ");
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| 195 | }
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| 196 | }
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| 197 |
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| 198 | sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); }
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| 199 | sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); }
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| 200 | sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); }
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| 201 |
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| 202 | sub ::align
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| 203 | { my $val=$_[0];
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| 204 | if ($::aout)
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| 205 | { $val=int(log($val)/log(2));
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| 206 | $val.=",0x90";
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| 207 | }
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| 208 | push(@out,".align\t$val\n");
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| 209 | }
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| 210 |
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| 211 | sub ::picmeup
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| 212 | { my($dst,$sym,$base,$reflabel)=@_;
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| 213 |
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| 214 | if (($::pic && ($::elf || $::aout)) || $::macosx)
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| 215 | { if (!defined($base))
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| 216 | { &::call(&::label("PIC_me_up"));
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| 217 | &::set_label("PIC_me_up");
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| 218 | &::blindpop($dst);
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| 219 | $base=$dst;
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| 220 | $reflabel=&::label("PIC_me_up");
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| 221 | }
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| 222 | if ($::macosx)
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| 223 | { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
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| 224 | &::mov($dst,&::DWP("$indirect-$reflabel",$base));
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| 225 | $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
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| 226 | }
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| 227 | elsif ($sym eq "OPENSSL_ia32cap_P" && $::elf>0)
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| 228 | { &::lea($dst,&::DWP("$sym-$reflabel",$base)); }
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| 229 | else
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| 230 | { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
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| 231 | $base));
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| 232 | &::mov($dst,&::DWP("$sym\@GOT",$dst));
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| 233 | }
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| 234 | }
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| 235 | else
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| 236 | { &::lea($dst,&::DWP($sym)); }
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| 237 | }
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| 238 |
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| 239 | sub ::piccall
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| 240 | {
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| 241 | my $fnName = $_[0];
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| 242 | my $ret = "";
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| 243 |
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| 244 | # Can't use the perl routines here because everything would go into the .text
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| 245 | # section ignoring the desired section.
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| 246 | if ($::pic && $::elf)
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| 247 | {
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| 248 | $ret.= " pushl %ebx\n";
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| 249 | $ret.= " call .Lpic_call\n";
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| 250 | $ret.= ".Lpic_call:\n";
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| 251 | $ret.= " popl %ebx\n";
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| 252 | $ret.= " addl \$". &::DWP("_GLOBAL_OFFSET_TABLE_+[.-.Lpic_call]") . ", %ebx\n";
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| 253 | $ret.= " call ". &::DWP("$fnName\@PLT") . "\n";
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| 254 | $ret.= " popl %ebx\n";
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| 255 | }
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| 256 | else
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| 257 | {
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| 258 | $ret.= " call " . &::DWP($fnName) . "\n";
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| 259 | }
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| 260 | $ret
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| 261 | }
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| 262 |
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| 263 | sub ::initseg
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| 264 | { my $f=$nmdecor.shift;
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| 265 |
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| 266 | if ($::android)
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| 267 | { $initseg.=<<___;
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| 268 | .section .init_array
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| 269 | .align 4
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| 270 | .long $f
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| 271 | ___
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| 272 | }
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| 273 | elsif ($::elf)
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| 274 | {
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| 275 | $initseg.=".section .init\n";
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| 276 | $initseg.=&::piccall($f);
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| 277 | }
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| 278 | elsif ($::coff)
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| 279 | { $initseg.=<<___; # applies to both Cygwin and Mingw
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| 280 | .section .ctors
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| 281 | .long $f
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| 282 | ___
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| 283 | }
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| 284 | elsif ($::macosx)
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| 285 | { $initseg.=<<___;
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| 286 | .mod_init_func
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| 287 | .align 2
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| 288 | .long $f
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| 289 | ___
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| 290 | }
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| 291 | elsif ($::aout)
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| 292 | { my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
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| 293 | $initseg.=".text\n";
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| 294 | $initseg.=".type $ctor,\@function\n" if ($::pic);
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| 295 | $initseg.=<<___; # OpenBSD way...
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| 296 | .globl $ctor
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| 297 | .align 2
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| 298 | $ctor:
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| 299 | jmp $f
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| 300 | ___
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| 301 | }
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| 302 | }
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| 303 |
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| 304 | sub ::dataseg
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| 305 | { push(@out,".data\n"); }
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| 306 |
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| 307 | *::hidden = sub { push(@out,".hidden\t$nmdecor$_[0]\n"); } if ($::elf);
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| 308 |
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| 309 | 1;
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