--- /dev/null
+#!/usr/bin/env perl
+
+package x86gas;
+
+*out=\@::out;
+
+$::lbdecor=$::aout?"L":".L"; # local label decoration
+$nmdecor=($::aout or $::coff)?"_":""; # external name decoration
+
+$initseg="";
+
+$align=16;
+$align=log($align)/log(2) if ($::aout);
+$com_start="#" if ($::aout or $::coff);
+
+sub opsize()
+{ my $reg=shift;
+ if ($reg =~ m/^%e/o) { "l"; }
+ elsif ($reg =~ m/^%[a-d][hl]$/o) { "b"; }
+ elsif ($reg =~ m/^%[xm]/o) { undef; }
+ else { "w"; }
+}
+
+# swap arguments;
+# expand opcode with size suffix;
+# prefix numeric constants with $;
+sub ::generic
+{ my($opcode,@arg)=@_;
+ my($suffix,$dst,$src);
+
+ @arg=reverse(@arg);
+
+ for (@arg)
+ { s/^(\*?)(e?[a-dsixphl]{2})$/$1%$2/o; # gp registers
+ s/^([xy]?mm[0-7])$/%$1/o; # xmm/mmx registers
+ s/^(\-?[0-9]+)$/\$$1/o; # constants
+ s/^(\-?0x[0-9a-f]+)$/\$$1/o; # constants
+ }
+
+ $dst = $arg[$#arg] if ($#arg>=0);
+ $src = $arg[$#arg-1] if ($#arg>=1);
+ if ($dst =~ m/^%/o) { $suffix=&opsize($dst); }
+ elsif ($src =~ m/^%/o) { $suffix=&opsize($src); }
+ else { $suffix="l"; }
+ undef $suffix if ($dst =~ m/^%[xm]/o || $src =~ m/^%[xm]/o);
+
+ if ($#_==0) { &::emit($opcode); }
+ elsif ($#_==1 && $opcode =~ m/^(call|clflush|j|loop|set)/o)
+ { &::emit($opcode,@arg); }
+ else { &::emit($opcode.$suffix,@arg);}
+
+ 1;
+}
+#
+# opcodes not covered by ::generic above, mostly inconsistent namings...
+#
+sub ::movzx { &::movzb(@_); }
+sub ::pushfd { &::pushfl; }
+sub ::popfd { &::popfl; }
+sub ::cpuid { &::emit(".byte\t0x0f,0xa2"); }
+sub ::rdtsc { &::emit(".byte\t0x0f,0x31"); }
+
+sub ::call { &::emit("call",(&::islabel($_[0]) or "$nmdecor$_[0]")); }
+sub ::call_ptr { &::generic("call","*$_[0]"); }
+sub ::jmp_ptr { &::generic("jmp","*$_[0]"); }
+
+*::bswap = sub { &::emit("bswap","%$_[0]"); } if (!$::i386);
+
+sub ::DWP
+{ my($addr,$reg1,$reg2,$idx)=@_;
+ my $ret="";
+
+ $addr =~ s/^\s+//;
+ # prepend global references with optional underscore
+ $addr =~ s/^([^\+\-0-9][^\+\-]*)/&::islabel($1) or "$nmdecor$1"/ige;
+
+ $reg1 = "%$reg1" if ($reg1);
+ $reg2 = "%$reg2" if ($reg2);
+
+ $ret .= $addr if (($addr ne "") && ($addr ne 0));
+
+ if ($reg2)
+ { $idx!= 0 or $idx=1;
+ $ret .= "($reg1,$reg2,$idx)";
+ }
+ elsif ($reg1)
+ { $ret .= "($reg1)"; }
+
+ $ret;
+}
+sub ::QWP { &::DWP(@_); }
+sub ::BP { &::DWP(@_); }
+sub ::WP { &::DWP(@_); }
+sub ::BC { @_; }
+sub ::DWC { @_; }
+
+sub ::file
+{ push(@out,".file\t\"$_[0].s\"\n.text\n"); }
+
+sub ::function_begin_B
+{ my $func=shift;
+ my $global=($func !~ /^_/);
+ my $begin="${::lbdecor}_${func}_begin";
+
+ &::LABEL($func,$global?"$begin":"$nmdecor$func");
+ $func=$nmdecor.$func;
+
+ push(@out,".globl\t$func\n") if ($global);
+ if ($::coff)
+ { push(@out,".def\t$func;\t.scl\t".(3-$global).";\t.type\t32;\t.endef\n"); }
+ elsif (($::aout and !$::pic) or $::macosx)
+ { }
+ else
+ { push(@out,".type $func,\@function\n"); }
+ push(@out,".align\t$align\n");
+ push(@out,"$func:\n");
+ push(@out,"$begin:\n") if ($global);
+ $::stack=4;
+}
+
+sub ::function_end_B
+{ my $func=shift;
+ push(@out,".size\t$nmdecor$func,.-".&::LABEL($func)."\n") if ($::elf);
+ $::stack=0;
+ &::wipe_labels();
+}
+
+sub ::comment
+ {
+ if (!defined($com_start) or $::elf)
+ { # Regarding $::elf above...
+ # GNU and SVR4 as'es use different comment delimiters,
+ push(@out,"\n"); # so we just skip ELF comments...
+ return;
+ }
+ foreach (@_)
+ {
+ if (/^\s*$/)
+ { push(@out,"\n"); }
+ else
+ { push(@out,"\t$com_start $_ $com_end\n"); }
+ }
+ }
+
+sub ::external_label
+{ foreach(@_) { &::LABEL($_,$nmdecor.$_); } }
+
+sub ::public_label
+{ push(@out,".globl\t".&::LABEL($_[0],$nmdecor.$_[0])."\n"); }
+
+sub ::file_end
+{ if ($::macosx)
+ { if (%non_lazy_ptr)
+ { push(@out,".section __IMPORT,__pointers,non_lazy_symbol_pointers\n");
+ foreach $i (keys %non_lazy_ptr)
+ { push(@out,"$non_lazy_ptr{$i}:\n.indirect_symbol\t$i\n.long\t0\n"); }
+ }
+ }
+ if (grep {/\b${nmdecor}OPENSSL_ia32cap_P\b/i} @out) {
+ my $tmp=".comm\t${nmdecor}OPENSSL_ia32cap_P,8";
+ if ($::macosx) { push (@out,"$tmp,2\n"); }
+ elsif ($::elf) { push (@out,"$tmp,4\n"); }
+ else { push (@out,"$tmp\n"); }
+ }
+ push(@out,$initseg) if ($initseg);
+}
+
+sub ::data_byte { push(@out,".byte\t".join(',',@_)."\n"); }
+sub ::data_short{ push(@out,".value\t".join(',',@_)."\n"); }
+sub ::data_word { push(@out,".long\t".join(',',@_)."\n"); }
+
+sub ::align
+{ my $val=$_[0],$p2,$i;
+ if ($::aout)
+ { for ($p2=0;$val!=0;$val>>=1) { $p2++; }
+ $val=$p2-1;
+ $val.=",0x90";
+ }
+ push(@out,".align\t$val\n");
+}
+
+sub ::picmeup
+{ my($dst,$sym,$base,$reflabel)=@_;
+
+ if (($::pic && ($::elf || $::aout)) || $::macosx)
+ { if (!defined($base))
+ { &::call(&::label("PIC_me_up"));
+ &::set_label("PIC_me_up");
+ &::blindpop($dst);
+ $base=$dst;
+ $reflabel=&::label("PIC_me_up");
+ }
+ if ($::macosx)
+ { my $indirect=&::static_label("$nmdecor$sym\$non_lazy_ptr");
+ &::mov($dst,&::DWP("$indirect-$reflabel",$base));
+ $non_lazy_ptr{"$nmdecor$sym"}=$indirect;
+ }
+ else
+ { &::lea($dst,&::DWP("_GLOBAL_OFFSET_TABLE_+[.-$reflabel]",
+ $base));
+ &::mov($dst,&::DWP("$sym\@GOT",$dst));
+ }
+ }
+ else
+ { &::lea($dst,&::DWP($sym)); }
+}
+
+sub ::initseg
+{ my $f=$nmdecor.shift;
+
+ if ($::android)
+ { $initseg.=<<___;
+.section .init_array
+.align 4
+.long $f
+___
+ }
+ elsif ($::elf)
+ { $initseg.=<<___;
+.section .init
+ call $f
+___
+ }
+ elsif ($::coff)
+ { $initseg.=<<___; # applies to both Cygwin and Mingw
+.section .ctors
+.long $f
+___
+ }
+ elsif ($::macosx)
+ { $initseg.=<<___;
+.mod_init_func
+.align 2
+.long $f
+___
+ }
+ elsif ($::aout)
+ { my $ctor="${nmdecor}_GLOBAL_\$I\$$f";
+ $initseg.=".text\n";
+ $initseg.=".type $ctor,\@function\n" if ($::pic);
+ $initseg.=<<___; # OpenBSD way...
+.globl $ctor
+.align 2
+$ctor:
+ jmp $f
+___
+ }
+}
+
+sub ::dataseg
+{ push(@out,".data\n"); }
+
+1;
projects / cassiopeia.git / blobdiff