# 6. Don't use [or hand-code with .byte] "rep ret." "ret" mnemonic is
# required to identify the spots, where to inject Win64 epilogue!
# But on the pros, it's then prefixed with rep automatically:-)
-# 7. Due to MASM limitations [and certain general counter-intuitivity
-# of ip-relative addressing] generation of position-independent
-# code is assisted by synthetic directive, .picmeup, which puts
-# address of the *next* instruction into target register.
+# 7. Stick to explicit ip-relative addressing. If you have to use
+# GOTPCREL addressing, stick to mov symbol@GOTPCREL(%rip),%r??.
+# Both are recognized and translated to proper Win64 addressing
+# modes. To support legacy code a synthetic directive, .picmeup,
+# is implemented. It puts address of the *next* instruction into
+# target register, e.g.:
#
-# Example 1:
# .picmeup %rax
# lea .Label-.(%rax),%rax
-# Example 2:
-# .picmeup %rcx
-# .Lpic_point:
-# ...
-# lea .Label-.Lpic_point(%rcx),%rbp
#
# 8. In order to provide for structured exception handling unified
# Win64 prologue copies %rsp value to %rax. For further details
# see SEH paragraph at the end.
+# 9. .init segment is allowed to contain calls to functions only.
\f
-my $output = shift;
+my $flavour = shift;
+my $output = shift;
+if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
{ my ($stddev,$stdino,@junk)=stat(STDOUT);
my ($outdev,$outino,@junk)=stat($output);
if ($stddev!=$outdev || $stdino!=$outino);
}
-my $win64=1 if ($output =~ /\.asm$/);
+my $gas=1; $gas=0 if ($output =~ /\.asm$/);
+my $elf=1; $elf=0 if (!$gas);
+my $win64=0;
+my $prefix="";
my $masmref=8 + 50727*2**-32; # 8.00.50727 shipped with VS2005
my $masm=0;
my $nasmref=2.03;
my $nasm=0;
-if ($win64)
+if ($flavour eq "mingw64") { $gas=1; $elf=0; $win64=1; $prefix="_"; }
+elsif ($flavour eq "macosx") { $gas=1; $elf=0; $prefix="_"; }
+elsif ($flavour eq "masm") { $gas=0; $elf=0; $masm=$masmref; $win64=1; }
+elsif ($flavour eq "nasm") { $gas=0; $elf=0; $nasm=$nasmref; $win64=1; $PTR=""; }
+elsif (!$gas)
{ if ($ENV{ASM} =~ m/nasm/ && `nasm -v` =~ m/version ([0-9]+)\.([0-9]+)/i)
{ $nasm = $1 + $2*0.01; $PTR=""; }
elsif (`ml64 2>&1` =~ m/Version ([0-9]+)\.([0-9]+)(\.([0-9]+))?/)
{ $masm = $1 + $2*2**-16 + $4*2**-32; }
die "no assembler found on %PATH" if (!($nasm || $masm));
+ $win64=1;
+ $elf=0;
}
my $current_segment;
}
sub out {
my $self = shift;
- if (!$win64) {
+ if ($gas) {
if ($self->{op} eq "movz") { # movz is pain...
sprintf "%s%s%s",$self->{op},$self->{sz},shift;
} elsif ($self->{op} =~ /^set/) {
"$self->{op}";
} elsif ($self->{op} eq "ret") {
- ".byte 0xf3,0xc3";
+ my $epilogue = "";
+ if ($win64 && $current_function->{abi} eq "svr4") {
+ $epilogue = "movq 8(%rsp),%rdi\n\t" .
+ "movq 16(%rsp),%rsi\n\t";
+ }
+ $epilogue . ".byte 0xf3,0xc3";
+ } elsif ($self->{op} eq "call" && !$elf && $current_segment eq ".init") {
+ ".p2align\t3\n\t.quad";
} else {
"$self->{op}$self->{sz}";
}
$self->{op} =~ s/^movz/movzx/;
if ($self->{op} eq "ret") {
$self->{op} = "";
- if ($current_function->{abi} eq "svr4") {
+ if ($win64 && $current_function->{abi} eq "svr4") {
$self->{op} = "mov rdi,QWORD${PTR}[8+rsp]\t;WIN64 epilogue\n\t".
"mov rsi,QWORD${PTR}[16+rsp]\n\t";
}
$self->{op} .= "DB\t0F3h,0C3h\t\t;repret";
- }
- elsif ($self->{op} =~ /^(pop|push)f/) {
+ } elsif ($self->{op} =~ /^(pop|push)f/) {
$self->{op} .= $self->{sz};
- }
+ } elsif ($self->{op} eq "call" && $current_segment eq ".CRT\$XCU") {
+ $self->{op} = "ALIGN\t8\n\tDQ";
+ }
$self->{op};
}
}
- sub mnemonic { shift->{op}; }
+ sub mnemonic {
+ my $self=shift;
+ my $op=shift;
+ $self->{op}=$op if (defined($op));
+ $self->{op};
+ }
}
{ package const; # pick up constants, which start with $
sub re {
sub out {
my $self = shift;
- if (!$win64) {
+ if ($gas) {
# Solaris /usr/ccs/bin/as can't handle multiplications
# in $self->{value}
$self->{value} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
$ret = $self;
$line = substr($line,@+[0]); $line =~ s/^\s+//;
+ if ($win64 && $self->{label} =~ s/\@GOTPCREL//) {
+ die if (opcode->mnemonic() ne "mov");
+ opcode->mnemonic("lea");
+ }
$self->{base} =~ s/^%//;
$self->{index} =~ s/^%// if (defined($self->{index}));
}
my $self = shift;
my $sz = shift;
+ $self->{label} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+
# Silently convert all EAs to 64-bit. This is required for
# elder GNU assembler and results in more compact code,
# *but* most importantly AES module depends on this feature!
$self->{index} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
$self->{base} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
- if (!$win64) {
+ if ($gas) {
# Solaris /usr/ccs/bin/as can't handle multiplications
# in $self->{label}
$self->{label} =~ s/(?<![0-9a-f])(0[x0-9a-f]+)/oct($1)/egi;
$self->{label} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
+ $self->{label} =~ s/\.L/L\$/g if (!$elf);
if (defined($self->{index})) {
sprintf "%s%s(%%%s,%%%s,%d)",$self->{asterisk},
}
sub out {
my $self = shift;
- if (!$win64) { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
+ if ($gas) { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
else { $self->{value}; }
}
}
local *line = shift;
undef $ret;
- if ($line =~ /(^[\.\w]+\:)/) {
+ if ($line =~ /(^[\.\w]+)\:/) {
$self->{value} = $1;
$ret = $self;
$line = substr($line,@+[0]); $line =~ s/^\s+//;
- $self->{value} =~ s/\.L/\$L\$/ if ($win64);
+ $self->{value} =~ s/\.L/\$L\$/ if (!$gas);
+ $self->{value} =~ s/\.L/L\$/ if (!$elf);
}
$ret;
}
sub out {
my $self = shift;
- if (!$win64) {
- $self->{value};
- } elsif ($self->{value} ne "$current_function->{name}:") {
+ if ($gas) {
+ my $func = ($globals{$self->{value}} or $self->{value}) . ":";
+ if ($win64 &&
+ $current_function->{name} eq $self->{value} &&
+ $current_function->{abi} eq "svr4") {
+ $func .= "\n";
+ $func .= " movq %rdi,8(%rsp)\n";
+ $func .= " movq %rsi,16(%rsp)\n";
+ $func .= " movq %rsp,%rax\n";
+ $func .= ".LSEH_begin_$current_function->{name}:\n";
+ my $narg = $current_function->{narg};
+ $narg=6 if (!defined($narg));
+ $func .= " movq %rcx,%rdi\n" if ($narg>0);
+ $func .= " movq %rdx,%rsi\n" if ($narg>1);
+ $func .= " movq %r8,%rdx\n" if ($narg>2);
+ $func .= " movq %r9,%rcx\n" if ($narg>3);
+ $func .= " movq 40(%rsp),%r8\n" if ($narg>4);
+ $func .= " movq 48(%rsp),%r9\n" if ($narg>5);
+ }
+ $func;
+ } elsif ($self->{value} ne "$current_function->{name}") {
$self->{value} .= ":" if ($masm && $ret!~m/^\$/);
- $self->{value};
- } elsif ($current_function->{abi} eq "svr4") {
+ $self->{value} . ":";
+ } elsif ($win64 && $current_function->{abi} eq "svr4") {
my $func = "$current_function->{name}" .
($nasm ? ":" : "\tPROC $current_function->{scope}") .
"\n";
$ret = $self;
$line = substr($line,@+[0]); $line =~ s/^\s+//;
- $self->{value} =~ s/\.L/\$L\$/g if ($win64);
+ $self->{value} =~ s/\@PLT// if (!$elf);
+ $self->{value} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+ $self->{value} =~ s/\.L/\$L\$/g if (!$gas);
+ $self->{value} =~ s/\.L/L\$/g if (!$elf);
}
$ret;
}
"%r14"=>0x01358d4c, "%r15"=>0x013d8d4c );
if ($line =~ /^\s*(\.\w+)/) {
- if (!$win64) {
- $self->{value} = $1;
- $line =~ s/\@abi\-omnipotent/\@function/;
- $line =~ s/\@function.*/\@function/;
- if ($line =~ /\.picmeup\s+(%r[\w]+)/i) {
- $self->{value} = sprintf "\t.long\t0x%x,0x90000000",$opcode{$1};
- } elsif ($line =~ /\.asciz\s+"(.*)"$/) {
- $self->{value} = ".byte\t".join(",",unpack("C*",$1),0);
- } elsif ($line =~ /\.extern/) {
+ $dir = $1;
+ $ret = $self;
+ undef $self->{value};
+ $line = substr($line,@+[0]); $line =~ s/^\s+//;
+
+ SWITCH: for ($dir) {
+ /\.picmeup/ && do { if ($line =~ /(%r[\w]+)/i) {
+ $dir="\t.long";
+ $line=sprintf "0x%x,0x90000000",$opcode{$1};
+ }
+ last;
+ };
+ /\.global|\.globl|\.extern/
+ && do { $globals{$line} = $prefix . $line;
+ $line = $globals{$line} if ($prefix);
+ last;
+ };
+ /\.type/ && do { ($sym,$type,$narg) = split(',',$line);
+ if ($type eq "\@function") {
+ undef $current_function;
+ $current_function->{name} = $sym;
+ $current_function->{abi} = "svr4";
+ $current_function->{narg} = $narg;
+ $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
+ } elsif ($type eq "\@abi-omnipotent") {
+ undef $current_function;
+ $current_function->{name} = $sym;
+ $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
+ }
+ $line =~ s/\@abi\-omnipotent/\@function/;
+ $line =~ s/\@function.*/\@function/;
+ last;
+ };
+ /\.asciz/ && do { if ($line =~ /^"(.*)"$/) {
+ $dir = ".byte";
+ $line = join(",",unpack("C*",$1),0);
+ }
+ last;
+ };
+ }
+
+ if ($gas) {
+ $self->{value} = $dir . "\t" . $line;
+
+ if ($dir =~ /\.extern/) {
$self->{value} = ""; # swallow extern
- } else {
- $self->{value} = $line;
+ } elsif (!$elf && $dir =~ /\.type/) {
+ $self->{value} = "";
+ $self->{value} = ".def\t" . ($globals{$1} or $1) . ";\t" .
+ (defined($globals{$1})?".scl 2;":".scl 3;") .
+ "\t.type 32;\t.endef"
+ if ($win64 && $line =~ /([^,]+),\@function/);
+ } elsif (!$elf && $dir =~ /\.size/) {
+ $self->{value} = "";
+ if (defined($current_function)) {
+ $self->{value} .= ".LSEH_end_$current_function->{name}:"
+ if ($win64 && $current_function->{abi} eq "svr4");
+ undef $current_function;
+ }
+ } elsif (!$elf && $dir =~ /\.align/) {
+ $self->{value} = ".p2align\t" . (log($line)/log(2));
+ } elsif ($dir eq ".section") {
+ $current_segment=$line;
+ if (!$elf && $current_segment eq ".init") {
+ if ($flavour eq "macosx") { $self->{value} = ".mod_init_func"; }
+ elsif ($flavour eq "mingw64") { $self->{value} = ".section\t.ctors"; }
+ }
+ } elsif ($dir =~ /\.(text|data)/) {
+ $current_segment=".$1";
}
$line = "";
return $self;
}
- $dir = $1;
- $ret = $self;
- undef $self->{value};
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ # non-gas case or nasm/masm
SWITCH: for ($dir) {
/\.text/ && do { my $v=undef;
if ($nasm) {
last;
};
/\.section/ && do { my $v=undef;
+ $line =~ s/([^,]*).*/$1/;
+ $line = ".CRT\$XCU" if ($line eq ".init");
if ($nasm) {
$v="section $line";
if ($line=~/\.([px])data/) {
/\.globl|.global/
&& do { $self->{value} = $masm?"PUBLIC":"global";
$self->{value} .= "\t".$line;
- $globals{$line} = $line;
- last;
- };
- /\.type/ && do { ($sym,$type,$narg) = split(',',$line);
- if ($type eq "\@function") {
- undef $current_function;
- $current_function->{name} = $sym;
- $current_function->{abi} = "svr4";
- $current_function->{narg} = $narg;
- $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
- } elsif ($type eq "\@abi-omnipotent") {
- undef $current_function;
- $current_function->{name} = $sym;
- $current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
- }
last;
};
/\.size/ && do { if (defined($current_function)) {
last;
};
/\.align/ && do { $self->{value} = "ALIGN\t".$line; last; };
- /\.(byte|value|long|quad)/
+ /\.(value|long|rva|quad)/
&& do { my $sz = substr($1,0,1);
my @arr = split(',',$line);
my $last = pop(@arr);
my $conv = sub { my $var=shift;
$var=~s/0x([0-9a-f]+)/0$1h/ig;
$var=~s/\.L/\$L\$/g;
- if ($current_segment=~/.[px]data/)
+ if ($sz eq "D" && ($current_segment=~/.[px]data/ || $dir eq ".rva"))
{ $var=~s/([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
$var;
};
- $sz =~ tr/bvlq/BWDQ/;
+ $sz =~ tr/bvlrq/BWDDQ/;
$self->{value} = "\tD$sz\t";
for (@arr) { $self->{value} .= &$conv($_).","; }
$self->{value} .= &$conv($last);
last;
};
- /\.picmeup/ && do { $self->{value} = sprintf"\tDD\t0%Xh,090000000h",$opcode{$line};
- last;
- };
- /\.asciz/ && do { if ($line =~ /^"(.*)"$/) {
- my @str=unpack("C*",$1);
- push @str,0;
- while ($#str>15) {
- $self->{value}.="DB\t"
- .join(",",@str[0..15])."\n";
- foreach (0..15) { shift @str; }
- }
+ /\.byte/ && do { my @str=split(",",$line);
+ while ($#str>15) {
$self->{value}.="DB\t"
- .join(",",@str) if (@str);
+ .join(",",@str[0..15])."\n";
+ foreach (0..15) { shift @str; }
}
+ $self->{value}.="DB\t"
+ .join(",",@str) if (@str);
last;
};
}
$sz=opcode->size();
if (defined($dst)) {
- if (!$win64) {
+ if ($gas) {
printf "\t%s\t%s,%s", $opcode->out($dst->size()),
$src->out($sz),$dst->out($sz);
} else {
print $line,"\n";
}
-print "\n$current_segment\tENDS\nEND\n" if ($current_segment && $masm);
+print "\n$current_segment\tENDS\n" if ($current_segment && $masm);
+print "END\n" if ($masm);
close STDOUT;
#
# function_unwind_info:
# .byte 9,0,0,0
-# .long handler
+# .rva handler
#
# This structure designates exception handler for a function with
# zero-length prologue, no stack frame or frame register.
#
# To facilitate composing of .pdata structures, auto-generated "gear"
# prologue copies rsp value to rax and denotes next instruction with
-# $L$SEH_begin_{function_name} label. This essentially defines the SEH
+# .LSEH_begin_{function_name} label. This essentially defines the SEH
# styling rule mentioned in the beginning. Position of this label is
# chosen in such manner that possible exceptions raised in the "gear"
# prologue would be accounted to caller and unwound from latter's frame.
-# End of function is marked with respective $L$SEH_end_{function_name}
+# End of function is marked with respective .LSEH_end_{function_name}
# label. To summarize, .pdata segment would contain
#
-# .long $L$SEH_begin_function
-# .long $L$SEH_end_function
-# .long function_unwind_info
+# .rva .LSEH_begin_function
+# .rva .LSEH_end_function
+# .rva function_unwind_info
#
# Reference to functon_unwind_info from .xdata segment is the anchor.
-# In case you wonder why references are 32-bit .longs and not 64-bit
+# In case you wonder why references are 32-bit .rvas and not 64-bit
# .quads. References put into these two segments are required to be
# *relative* to the base address of the current binary module, a.k.a.
# image base. No Win64 module, be it .exe or .dll, can be larger than
projects / oweals / openssl.git / commitdiff