1 #! /usr/bin/env perl 2 # Copyright 1999-2016 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 x86nasm; 11 12 *out=\@::out; 13 14 $::lbdecor="L\$"; # local label decoration 15 $nmdecor=$::netware?"":"_"; # external name decoration 16 $drdecor=$::mwerks?".":""; # directive decoration 17 18 $initseg=""; 19 20 sub ::generic 21 { my $opcode=shift; 22 my $tmp; 23 24 if (!$::mwerks) 25 { if ($opcode =~ m/^j/o && $#_==0) # optimize jumps 26 { $_[0] = "NEAR $_[0]"; } 27 elsif ($opcode eq "lea" && $#_==1) # wipe storage qualifier from lea 28 { $_[1] =~ s/^[^\[]*\[/\[/o; } 29 elsif ($opcode eq "clflush" && $#_==0) 30 { $_[0] =~ s/^[^\[]*\[/\[/o; } 31 } 32 &::emit($opcode,@_); 33 1; 34 } 35 # 36 # opcodes not covered by ::generic above, mostly inconsistent namings... 37 # 38 sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); } 39 sub ::call_ptr { &::emit("call",@_); } 40 sub ::jmp_ptr { &::emit("jmp",@_); } 41 42 sub get_mem 43 { my($size,$addr,$reg1,$reg2,$idx)=@_; 44 my($post,$ret); 45 46 if (!defined($idx) && 1*$reg2) { $idx=$reg2; $reg2=$reg1; undef $reg1; } 47 48 if ($size ne "") 49 { $ret .= "$size"; 50 $ret .= " PTR" if ($::mwerks); 51 $ret .= " "; 52 } 53 $ret .= "["; 54 55 $addr =~ s/^\s+//; 56 # prepend global references with optional underscore 57 $addr =~ s/^([^\+\-0-9][^\+\-]*)/::islabel($1) or "$nmdecor$1"/ige; 58 # put address arithmetic expression in parenthesis 59 $addr="($addr)" if ($addr =~ /^.+[\-\+].+$/); 60 61 if (($addr ne "") && ($addr ne 0)) 62 { if ($addr !~ /^-/) { $ret .= "$addr+"; } 63 else { $post=$addr; } 64 } 65 66 if ($reg2 ne "") 67 { $idx!=0 or $idx=1; 68 $ret .= "$reg2*$idx"; 69 $ret .= "+$reg1" if ($reg1 ne ""); 70 } 71 else 72 { $ret .= "$reg1"; } 73 74 $ret .= "$post]"; 75 $ret =~ s/\+\]/]/; # in case $addr was the only argument 76 77 $ret; 78 } 79 sub ::BP { &get_mem("BYTE",@_); } 80 sub ::DWP { &get_mem("DWORD",@_); } 81 sub ::WP { &get_mem("WORD",@_); } 82 sub ::QWP { &get_mem("",@_); } 83 sub ::BC { (($::mwerks)?"":"BYTE ")."@_"; } 84 sub ::DWC { (($::mwerks)?"":"DWORD ")."@_"; } 85 86 sub ::file 87 { if ($::mwerks) { push(@out,".section\t.text,64\n"); } 88 else 89 { my $tmp=<<___; 90 %ifidn __OUTPUT_FORMAT__,obj 91 section code use32 class=code align=64 92 %elifidn __OUTPUT_FORMAT__,win32 93 %ifdef __YASM_VERSION_ID__ 94 %if __YASM_VERSION_ID__ < 01010000h 95 %error yasm version 1.1.0 or later needed. 96 %endif 97 ; Yasm automatically includes @feat.00 and complains about redefining it. 98 ; https://www.tortall.net/projects/yasm/manual/html/objfmt-win32-safeseh.html 99 %else 100 \$\@feat.00 equ 1 101 %endif 102 section .text code align=64 103 %else 104 section .text code 105 %endif 106 ___ 107 push(@out,$tmp); 108 } 109 } 110 111 sub ::function_begin_B 112 { my $func=shift; 113 my $global=($func !~ /^_/); 114 my $begin="${::lbdecor}_${func}_begin"; 115 116 $begin =~ s/^\@/./ if ($::mwerks); # the torture never stops 117 118 &::LABEL($func,$global?"$begin":"$nmdecor$func"); 119 $func=$nmdecor.$func; 120 121 push(@out,"${drdecor}global $func\n") if ($global); 122 push(@out,"${drdecor}align 16\n"); 123 push(@out,"$func:\n"); 124 push(@out,"$begin:\n") if ($global); 125 $::stack=4; 126 } 127 128 sub ::function_end_B 129 { $::stack=0; 130 &::wipe_labels(); 131 } 132 133 sub ::file_end 134 { if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) 135 { my $comm=<<___; 136 ${drdecor}segment .bss 137 ${drdecor}common ${nmdecor}OPENSSL_ia32cap_P 16 138 ___ 139 # comment out OPENSSL_ia32cap_P declarations 140 grep {s/(^extern\s+${nmdecor}OPENSSL_ia32cap_P)/\;$1/} @out; 141 push (@out,$comm) 142 } 143 push (@out,$initseg) if ($initseg); 144 } 145 146 sub ::comment { foreach (@_) { push(@out,"\t; $_\n"); } } 147 148 sub ::external_label 149 { foreach(@_) 150 { push(@out,"${drdecor}extern\t".&::LABEL($_,$nmdecor.$_)."\n"); } 151 } 152 153 sub ::public_label 154 { push(@out,"${drdecor}global\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); } 155 156 sub ::data_byte 157 { push(@out,(($::mwerks)?".byte\t":"db\t").join(',',@_)."\n"); } 158 sub ::data_short 159 { push(@out,(($::mwerks)?".word\t":"dw\t").join(',',@_)."\n"); } 160 sub ::data_word 161 { push(@out,(($::mwerks)?".long\t":"dd\t").join(',',@_)."\n"); } 162 163 sub ::align 164 { push(@out,"${drdecor}align\t$_[0]\n"); } 165 166 sub ::picmeup 167 { my($dst,$sym)=@_; 168 &::lea($dst,&::DWP($sym)); 169 } 170 171 sub ::initseg 172 { my $f=$nmdecor.shift; 173 if ($::win32) 174 { $initseg=<<___; 175 segment .CRT\$XCU data align=4 176 extern $f 177 dd $f 178 ___ 179 } 180 } 181 182 sub ::dataseg 183 { if ($mwerks) { push(@out,".section\t.data,4\n"); } 184 else { push(@out,"section\t.data align=4\n"); } 185 } 186 187 sub ::safeseh 188 { my $nm=shift; 189 push(@out,"%if __NASM_VERSION_ID__ >= 0x02030000\n"); 190 push(@out,"safeseh ".&::LABEL($nm,$nmdecor.$nm)."\n"); 191 push(@out,"%endif\n"); 192 } 193 194 1; 195
