-#!/usr/bin/env perl
+#! /usr/bin/env perl
+# Copyright 2005-2018 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the Apache License 2.0 (the "License"). You may not use
+# this file except in compliance with the License. You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
# Ascetic x86_64 AT&T to MASM/NASM assembler translator by <appro>.
#
# 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.:
-#
-# .picmeup %rax
-# lea .Label-.(%rax),%rax
+# modes.
#
# 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.
+# a. If function accepts more than 4 arguments *and* >4th argument
+# is declared as non 64-bit value, do clear its upper part.
\f
+
+use strict;
+
my $flavour = shift;
my $output = shift;
if ($flavour =~ /\./) { $output = $flavour; undef $flavour; }
-{ my ($stddev,$stdino,@junk)=stat(STDOUT);
- my ($outdev,$outino,@junk)=stat($output);
-
- open STDOUT,">$output" || die "can't open $output: $!"
- if ($stddev!=$outdev || $stdino!=$outino);
-}
+open STDOUT,">$output" || die "can't open $output: $!"
+ if (defined($output));
my $gas=1; $gas=0 if ($output =~ /\.asm$/);
my $elf=1; $elf=0 if (!$gas);
my $nasmref=2.03;
my $nasm=0;
-if ($flavour eq "mingw64") { $gas=1; $elf=0; $win64=1; $prefix="_"; }
+if ($flavour eq "mingw64") { $gas=1; $elf=0; $win64=1;
+ $prefix=`echo __USER_LABEL_PREFIX__ | $ENV{CC} -E -P -`;
+ $prefix =~ s|\R$||; # Better chomp
+ }
elsif ($flavour eq "macosx") { $gas=1; $elf=0; $prefix="_"; $decor="L\$"; }
elsif ($flavour eq "masm") { $gas=0; $elf=0; $masm=$masmref; $win64=1; $decor="\$L\$"; }
elsif ($flavour eq "nasm") { $gas=0; $elf=0; $nasm=$nasmref; $win64=1; $decor="\$L\$"; $PTR=""; }
{ $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 || $masm));
+ die "no assembler found on %PATH%" if (!($nasm || $masm));
$win64=1;
$elf=0;
$decor="\$L\$";
{ package opcode; # pick up opcodes
sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
- if ($line =~ /^([a-z][a-z0-9]*)/i) {
+ if ($$line =~ /^([a-z][a-z0-9]*)/i) {
+ bless $self,$class;
$self->{op} = $1;
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
undef $self->{sz};
- if ($self->{op} =~ /^(movz)b.*/) { # movz is pain...
+ if ($self->{op} =~ /^(movz)x?([bw]).*/) { # movz is pain...
$self->{op} = $1;
- $self->{sz} = "b";
+ $self->{sz} = $2;
} elsif ($self->{op} =~ /call|jmp/) {
- $self->{sz} = ""
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /^p/ && $' !~ /^(ush|op|insrw)/) { # SSEn
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /^[vk]/) { # VEX or k* such as kmov
+ $self->{sz} = "";
+ } elsif ($self->{op} =~ /mov[dq]/ && $$line =~ /%xmm/) {
+ $self->{sz} = "";
} elsif ($self->{op} =~ /([a-z]{3,})([qlwb])$/) {
$self->{op} = $1;
$self->{sz} = $2;
$ret;
}
sub size {
- my $self = shift;
- my $sz = shift;
+ my ($self, $sz) = @_;
$self->{sz} = $sz if (defined($sz) && !defined($self->{sz}));
$self->{sz};
}
if ($gas) {
if ($self->{op} eq "movz") { # movz is pain...
sprintf "%s%s%s",$self->{op},$self->{sz},shift;
- } elsif ($self->{op} =~ /^set/) {
+ } elsif ($self->{op} =~ /^set/) {
"$self->{op}";
} elsif ($self->{op} eq "ret") {
my $epilogue = "";
if ($self->{op} eq "ret") {
$self->{op} = "";
if ($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";
+ $self->{op} = "mov rdi,QWORD$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/) {
$self->{op} .= $self->{sz};
} elsif ($self->{op} eq "call" && $current_segment eq ".CRT\$XCU") {
- $self->{op} = "ALIGN\t8\n\tDQ";
- }
+ $self->{op} = "\tDQ";
+ }
$self->{op};
}
}
sub mnemonic {
- my $self=shift;
- my $op=shift;
+ my ($self, $op) = @_;
$self->{op}=$op if (defined($op));
$self->{op};
}
}
{ package const; # pick up constants, which start with $
sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
- if ($line =~ /^\$([^,]+)/) {
+ if ($$line =~ /^\$([^,]+)/) {
+ bless $self, $class;
$self->{value} = $1;
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
}
$ret;
}
sub out {
my $self = shift;
+ $self->{value} =~ s/\b(0b[0-1]+)/oct($1)/eig;
if ($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;
- $self->{value} =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg;
+ my $value = $self->{value};
+ no warnings; # oct might complain about overflow, ignore here...
+ $value =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
+ if ($value =~ s/([0-9]+\s*[\*\/\%]\s*[0-9]+)/eval($1)/eg) {
+ $self->{value} = $value;
+ }
sprintf "\$%s",$self->{value};
} else {
- $self->{value} =~ s/(0b[0-1]+)/oct($1)/eig;
- $self->{value} =~ s/0x([0-9a-f]+)/0$1h/ig if ($masm);
- sprintf "%s",$self->{value};
+ my $value = $self->{value};
+ $value =~ s/0x([0-9a-f]+)/0$1h/ig if ($masm);
+ sprintf "%s",$value;
}
}
}
{ package ea; # pick up effective addresses: expr(%reg,%reg,scale)
+
+ my %szmap = ( b=>"BYTE$PTR", w=>"WORD$PTR",
+ l=>"DWORD$PTR", d=>"DWORD$PTR",
+ q=>"QWORD$PTR", o=>"OWORD$PTR",
+ x=>"XMMWORD$PTR", y=>"YMMWORD$PTR",
+ z=>"ZMMWORD$PTR" ) if (!$gas);
+
sub re {
- my $self = shift; # single instance in enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line, $opcode) = @_;
+ my $self = {};
+ my $ret;
- # optional * ---vvv--- appears in indirect jmp/call
- if ($line =~ /^(\*?)([^\(,]*)\(([%\w,]+)\)/) {
+ # optional * ----vvv--- appears in indirect jmp/call
+ if ($$line =~ /^(\*?)([^\(,]*)\(([%\w,]+)\)((?:{[^}]+})*)/) {
+ bless $self, $class;
$self->{asterisk} = $1;
$self->{label} = $2;
($self->{base},$self->{index},$self->{scale})=split(/,/,$3);
$self->{scale} = 1 if (!defined($self->{scale}));
+ $self->{opmask} = $4;
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
if ($win64 && $self->{label} =~ s/\@GOTPCREL//) {
- die if (opcode->mnemonic() ne "mov");
- opcode->mnemonic("lea");
+ die if ($opcode->mnemonic() ne "mov");
+ $opcode->mnemonic("lea");
}
$self->{base} =~ s/^%//;
$self->{index} =~ s/^%// if (defined($self->{index}));
+ $self->{opcode} = $opcode;
}
$ret;
}
sub size {}
sub out {
- my $self = shift;
- my $sz = shift;
+ my ($self, $sz) = @_;
$self->{label} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
$self->{label} =~ s/\.L/$decor/g;
$self->{index} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
$self->{base} =~ s/^[er](.?[0-9xpi])[d]?$/r\1/;
+ # Solaris /usr/ccs/bin/as can't handle multiplications
+ # in $self->{label}...
+ use integer;
+ $self->{label} =~ s/(?<![\w\$\.])(0x?[0-9a-f]+)/oct($1)/egi;
+ $self->{label} =~ s/\b([0-9]+\s*[\*\/\%]\s*[0-9]+)\b/eval($1)/eg;
+
+ # Some assemblers insist on signed presentation of 32-bit
+ # offsets, but sign extension is a tricky business in perl...
+ if ((1<<31)<<1) {
+ $self->{label} =~ s/\b([0-9]+)\b/$1<<32>>32/eg;
+ } else {
+ $self->{label} =~ s/\b([0-9]+)\b/$1>>0/eg;
+ }
+
+ # if base register is %rbp or %r13, see if it's possible to
+ # flip base and index registers [for better performance]
+ if (!$self->{label} && $self->{index} && $self->{scale}==1 &&
+ $self->{base} =~ /(rbp|r13)/) {
+ $self->{base} = $self->{index}; $self->{index} = $1;
+ }
+
if ($gas) {
- # Solaris /usr/ccs/bin/as can't handle multiplications
- # in $self->{label}, new gas requires sign extension...
- use integer;
- $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/([0-9]+)/$1<<32>>32/eg;
$self->{label} =~ s/^___imp_/__imp__/ if ($flavour eq "mingw64");
if (defined($self->{index})) {
- sprintf "%s%s(%%%s,%%%s,%d)",$self->{asterisk},
- $self->{label},$self->{base},
- $self->{index},$self->{scale};
+ sprintf "%s%s(%s,%%%s,%d)%s",
+ $self->{asterisk},$self->{label},
+ $self->{base}?"%$self->{base}":"",
+ $self->{index},$self->{scale},
+ $self->{opmask};
} else {
- sprintf "%s%s(%%%s)", $self->{asterisk},$self->{label},$self->{base};
+ sprintf "%s%s(%%%s)%s", $self->{asterisk},$self->{label},
+ $self->{base},$self->{opmask};
}
} else {
- %szmap = ( b=>"BYTE$PTR", w=>"WORD$PTR", l=>"DWORD$PTR", q=>"QWORD$PTR" );
-
$self->{label} =~ s/\./\$/g;
- $self->{label} =~ s/0x([0-9a-f]+)/0$1h/ig;
+ $self->{label} =~ s/(?<![\w\$\.])0x([0-9a-f]+)/0$1h/ig;
$self->{label} = "($self->{label})" if ($self->{label} =~ /[\*\+\-\/]/);
- $sz="q" if ($self->{asterisk});
+
+ my $mnemonic = $self->{opcode}->mnemonic();
+ ($self->{asterisk}) && ($sz="q") ||
+ ($mnemonic =~ /^v?mov([qd])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^v?pinsr([qdwb])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^vpbroadcast([qdwb])$/) && ($sz=$1) ||
+ ($mnemonic =~ /^v(?!perm)[a-z]+[fi]128$/) && ($sz="x");
+
+ $self->{opmask} =~ s/%(k[0-7])/$1/;
if (defined($self->{index})) {
- sprintf "%s[%s%s*%d+%s]",$szmap{$sz},
+ sprintf "%s[%s%s*%d%s]%s",$szmap{$sz},
$self->{label}?"$self->{label}+":"",
$self->{index},$self->{scale},
- $self->{base};
+ $self->{base}?"+$self->{base}":"",
+ $self->{opmask};
} elsif ($self->{base} eq "rip") {
sprintf "%s[%s]",$szmap{$sz},$self->{label};
} else {
- sprintf "%s[%s%s]",$szmap{$sz},
+ sprintf "%s[%s%s]%s", $szmap{$sz},
$self->{label}?"$self->{label}+":"",
- $self->{base};
+ $self->{base},$self->{opmask};
}
}
}
}
{ package register; # pick up registers, which start with %.
sub re {
- my $class = shift; # muliple instances...
+ my ($class, $line, $opcode) = @_;
my $self = {};
- local *line = shift;
- undef $ret;
+ my $ret;
- # optional * ---vvv--- appears in indirect jmp/call
- if ($line =~ /^(\*?)%(\w+)/) {
+ # optional * ----vvv--- appears in indirect jmp/call
+ if ($$line =~ /^(\*?)%(\w+)((?:{[^}]+})*)/) {
bless $self,$class;
$self->{asterisk} = $1;
$self->{value} = $2;
+ $self->{opmask} = $3;
+ $opcode->size($self->size());
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
}
$ret;
}
sub size {
my $self = shift;
- undef $ret;
+ my $ret;
if ($self->{value} =~ /^r[\d]+b$/i) { $ret="b"; }
elsif ($self->{value} =~ /^r[\d]+w$/i) { $ret="w"; }
}
sub out {
my $self = shift;
- if ($gas) { sprintf "%s%%%s",$self->{asterisk},$self->{value}; }
- else { $self->{value}; }
+ if ($gas) { sprintf "%s%%%s%s", $self->{asterisk},
+ $self->{value},
+ $self->{opmask}; }
+ else { $self->{opmask} =~ s/%(k[0-7])/$1/;
+ $self->{value}.$self->{opmask}; }
}
}
{ package label; # pick up labels, which end with :
sub re {
- my $self = shift; # single instance is enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
- if ($line =~ /(^[\.\w]+)\:/) {
+ if ($$line =~ /(^[\.\w]+)\:/) {
+ bless $self,$class;
$self->{value} = $1;
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
$self->{value} =~ s/^\.L/$decor/;
}
if ($gas) {
my $func = ($globals{$self->{value}} or $self->{value}) . ":";
- if ($win64 &&
- $current_function->{name} eq $self->{value} &&
- $current_function->{abi} eq "svr4") {
+ if ($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";
}
$func;
} elsif ($self->{value} ne "$current_function->{name}") {
- $self->{value} .= ":" if ($masm && $ret!~m/^\$/);
+ # Make all labels in masm global.
+ $self->{value} .= ":" if ($masm);
$self->{value} . ":";
} elsif ($win64 && $current_function->{abi} eq "svr4") {
my $func = "$current_function->{name}" .
($nasm ? ":" : "\tPROC $current_function->{scope}") .
"\n";
- $func .= " mov QWORD${PTR}[8+rsp],rdi\t;WIN64 prologue\n";
- $func .= " mov QWORD${PTR}[16+rsp],rsi\n";
+ $func .= " mov QWORD$PTR\[8+rsp\],rdi\t;WIN64 prologue\n";
+ $func .= " mov QWORD$PTR\[16+rsp\],rsi\n";
$func .= " mov rax,rsp\n";
$func .= "${decor}SEH_begin_$current_function->{name}:";
$func .= ":" if ($masm);
$func .= " mov rsi,rdx\n" if ($narg>1);
$func .= " mov rdx,r8\n" if ($narg>2);
$func .= " mov rcx,r9\n" if ($narg>3);
- $func .= " mov r8,QWORD${PTR}[40+rsp]\n" if ($narg>4);
- $func .= " mov r9,QWORD${PTR}[48+rsp]\n" if ($narg>5);
+ $func .= " mov r8,QWORD$PTR\[40+rsp\]\n" if ($narg>4);
+ $func .= " mov r9,QWORD$PTR\[48+rsp\]\n" if ($narg>5);
$func .= "\n";
} else {
"$current_function->{name}".
}
}
}
-{ package expr; # pick up expressioins
+{ package expr; # pick up expressions
sub re {
- my $self = shift; # single instance is enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line, $opcode) = @_;
+ my $self = {};
+ my $ret;
- if ($line =~ /(^[^,]+)/) {
+ if ($$line =~ /(^[^,]+)/) {
+ bless $self,$class;
$self->{value} = $1;
$ret = $self;
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$line = substr($$line,@+[0]); $$line =~ s/^\s+//;
$self->{value} =~ s/\@PLT// if (!$elf);
$self->{value} =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
$self->{value} =~ s/\.L/$decor/g;
+ $self->{opcode} = $opcode;
}
$ret;
}
sub out {
my $self = shift;
- if ($nasm && opcode->mnemonic()=~m/^j/) {
+ if ($nasm && $self->{opcode}->mnemonic()=~m/^j(?![re]cxz)/) {
"NEAR ".$self->{value};
} else {
$self->{value};
}
}
}
+{ package cfi_directive;
+ # CFI directives annotate instructions that are significant for
+ # stack unwinding procedure compliant with DWARF specification,
+ # see http://dwarfstd.org/. Besides naturally expected for this
+ # script platform-specific filtering function, this module adds
+ # three auxiliary synthetic directives not recognized by [GNU]
+ # assembler:
+ #
+ # - .cfi_push to annotate push instructions in prologue, which
+ # translates to .cfi_adjust_cfa_offset (if needed) and
+ # .cfi_offset;
+ # - .cfi_pop to annotate pop instructions in epilogue, which
+ # translates to .cfi_adjust_cfa_offset (if needed) and
+ # .cfi_restore;
+ # - [and most notably] .cfi_cfa_expression which encodes
+ # DW_CFA_def_cfa_expression and passes it to .cfi_escape as
+ # byte vector;
+ #
+ # CFA expressions were introduced in DWARF specification version
+ # 3 and describe how to deduce CFA, Canonical Frame Address. This
+ # becomes handy if your stack frame is variable and you can't
+ # spare register for [previous] frame pointer. Suggested directive
+ # syntax is made-up mix of DWARF operator suffixes [subset of]
+ # and references to registers with optional bias. Following example
+ # describes offloaded *original* stack pointer at specific offset
+ # from *current* stack pointer:
+ #
+ # .cfi_cfa_expression %rsp+40,deref,+8
+ #
+ # Final +8 has everything to do with the fact that CFA is defined
+ # as reference to top of caller's stack, and on x86_64 call to
+ # subroutine pushes 8-byte return address. In other words original
+ # stack pointer upon entry to a subroutine is 8 bytes off from CFA.
+
+ # Below constants are taken from "DWARF Expressions" section of the
+ # DWARF specification, section is numbered 7.7 in versions 3 and 4.
+ my %DW_OP_simple = ( # no-arg operators, mapped directly
+ deref => 0x06, dup => 0x12,
+ drop => 0x13, over => 0x14,
+ pick => 0x15, swap => 0x16,
+ rot => 0x17, xderef => 0x18,
+
+ abs => 0x19, and => 0x1a,
+ div => 0x1b, minus => 0x1c,
+ mod => 0x1d, mul => 0x1e,
+ neg => 0x1f, not => 0x20,
+ or => 0x21, plus => 0x22,
+ shl => 0x24, shr => 0x25,
+ shra => 0x26, xor => 0x27,
+ );
+
+ my %DW_OP_complex = ( # used in specific subroutines
+ constu => 0x10, # uleb128
+ consts => 0x11, # sleb128
+ plus_uconst => 0x23, # uleb128
+ lit0 => 0x30, # add 0-31 to opcode
+ reg0 => 0x50, # add 0-31 to opcode
+ breg0 => 0x70, # add 0-31 to opcole, sleb128
+ regx => 0x90, # uleb28
+ fbreg => 0x91, # sleb128
+ bregx => 0x92, # uleb128, sleb128
+ piece => 0x93, # uleb128
+ );
+
+ # Following constants are defined in x86_64 ABI supplement, for
+ # example available at https://www.uclibc.org/docs/psABI-x86_64.pdf,
+ # see section 3.7 "Stack Unwind Algorithm".
+ my %DW_reg_idx = (
+ "%rax"=>0, "%rdx"=>1, "%rcx"=>2, "%rbx"=>3,
+ "%rsi"=>4, "%rdi"=>5, "%rbp"=>6, "%rsp"=>7,
+ "%r8" =>8, "%r9" =>9, "%r10"=>10, "%r11"=>11,
+ "%r12"=>12, "%r13"=>13, "%r14"=>14, "%r15"=>15
+ );
+
+ my ($cfa_reg, $cfa_rsp);
+
+ # [us]leb128 format is variable-length integer representation base
+ # 2^128, with most significant bit of each byte being 0 denoting
+ # *last* most significant digit. See "Variable Length Data" in the
+ # DWARF specification, numbered 7.6 at least in versions 3 and 4.
+ sub sleb128 {
+ use integer; # get right shift extend sign
+
+ my $val = shift;
+ my $sign = ($val < 0) ? -1 : 0;
+ my @ret = ();
+
+ while(1) {
+ push @ret, $val&0x7f;
+
+ # see if remaining bits are same and equal to most
+ # significant bit of the current digit, if so, it's
+ # last digit...
+ last if (($val>>6) == $sign);
+
+ @ret[-1] |= 0x80;
+ $val >>= 7;
+ }
+
+ return @ret;
+ }
+ sub uleb128 {
+ my $val = shift;
+ my @ret = ();
+
+ while(1) {
+ push @ret, $val&0x7f;
+
+ # see if it's last significant digit...
+ last if (($val >>= 7) == 0);
+
+ @ret[-1] |= 0x80;
+ }
+
+ return @ret;
+ }
+ sub const {
+ my $val = shift;
+
+ if ($val >= 0 && $val < 32) {
+ return ($DW_OP_complex{lit0}+$val);
+ }
+ return ($DW_OP_complex{consts}, sleb128($val));
+ }
+ sub reg {
+ my $val = shift;
+
+ return if ($val !~ m/^(%r\w+)(?:([\+\-])((?:0x)?[0-9a-f]+))?/);
+
+ my $reg = $DW_reg_idx{$1};
+ my $off = eval ("0 $2 $3");
+
+ return (($DW_OP_complex{breg0} + $reg), sleb128($off));
+ # Yes, we use DW_OP_bregX+0 to push register value and not
+ # DW_OP_regX, because latter would require even DW_OP_piece,
+ # which would be a waste under the circumstances. If you have
+ # to use DWP_OP_reg, use "regx:N"...
+ }
+ sub cfa_expression {
+ my $line = shift;
+ my @ret;
+
+ foreach my $token (split(/,\s*/,$line)) {
+ if ($token =~ /^%r/) {
+ push @ret,reg($token);
+ } elsif ($token =~ /((?:0x)?[0-9a-f]+)\((%r\w+)\)/) {
+ push @ret,reg("$2+$1");
+ } elsif ($token =~ /(\w+):(\-?(?:0x)?[0-9a-f]+)(U?)/i) {
+ my $i = 1*eval($2);
+ push @ret,$DW_OP_complex{$1}, ($3 ? uleb128($i) : sleb128($i));
+ } elsif (my $i = 1*eval($token) or $token eq "0") {
+ if ($token =~ /^\+/) {
+ push @ret,$DW_OP_complex{plus_uconst},uleb128($i);
+ } else {
+ push @ret,const($i);
+ }
+ } else {
+ push @ret,$DW_OP_simple{$token};
+ }
+ }
+
+ # Finally we return DW_CFA_def_cfa_expression, 15, followed by
+ # length of the expression and of course the expression itself.
+ return (15,scalar(@ret),@ret);
+ }
+ sub re {
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
+
+ if ($$line =~ s/^\s*\.cfi_(\w+)\s*//) {
+ bless $self,$class;
+ $ret = $self;
+ undef $self->{value};
+ my $dir = $1;
+
+ SWITCH: for ($dir) {
+ # What is $cfa_rsp? Effectively it's difference between %rsp
+ # value and current CFA, Canonical Frame Address, which is
+ # why it starts with -8. Recall that CFA is top of caller's
+ # stack...
+ /startproc/ && do { ($cfa_reg, $cfa_rsp) = ("%rsp", -8); last; };
+ /endproc/ && do { ($cfa_reg, $cfa_rsp) = ("%rsp", 0); last; };
+ /def_cfa_register/
+ && do { $cfa_reg = $$line; last; };
+ /def_cfa_offset/
+ && do { $cfa_rsp = -1*eval($$line) if ($cfa_reg eq "%rsp");
+ last;
+ };
+ /adjust_cfa_offset/
+ && do { $cfa_rsp -= 1*eval($$line) if ($cfa_reg eq "%rsp");
+ last;
+ };
+ /def_cfa/ && do { if ($$line =~ /(%r\w+)\s*,\s*(.+)/) {
+ $cfa_reg = $1;
+ $cfa_rsp = -1*eval($2) if ($cfa_reg eq "%rsp");
+ }
+ last;
+ };
+ /push/ && do { $dir = undef;
+ $cfa_rsp -= 8;
+ if ($cfa_reg eq "%rsp") {
+ $self->{value} = ".cfi_adjust_cfa_offset\t8\n";
+ }
+ $self->{value} .= ".cfi_offset\t$$line,$cfa_rsp";
+ last;
+ };
+ /pop/ && do { $dir = undef;
+ $cfa_rsp += 8;
+ if ($cfa_reg eq "%rsp") {
+ $self->{value} = ".cfi_adjust_cfa_offset\t-8\n";
+ }
+ $self->{value} .= ".cfi_restore\t$$line";
+ last;
+ };
+ /cfa_expression/
+ && do { $dir = undef;
+ $self->{value} = ".cfi_escape\t" .
+ join(",", map(sprintf("0x%02x", $_),
+ cfa_expression($$line)));
+ last;
+ };
+ }
+
+ $self->{value} = ".cfi_$dir\t$$line" if ($dir);
+
+ $$line = "";
+ }
+
+ return $ret;
+ }
+ sub out {
+ my $self = shift;
+ return ($elf ? $self->{value} : undef);
+ }
+}
{ package directive; # pick up directives, which start with .
sub re {
- my $self = shift; # single instance is enough...
- local *line = shift;
- undef $ret;
+ my ($class, $line) = @_;
+ my $self = {};
+ my $ret;
my $dir;
- my %opcode = # lea 2f-1f(%rip),%dst; 1: nop; 2:
- ( "%rax"=>0x01058d48, "%rcx"=>0x010d8d48,
- "%rdx"=>0x01158d48, "%rbx"=>0x011d8d48,
- "%rsp"=>0x01258d48, "%rbp"=>0x012d8d48,
- "%rsi"=>0x01358d48, "%rdi"=>0x013d8d48,
- "%r8" =>0x01058d4c, "%r9" =>0x010d8d4c,
- "%r10"=>0x01158d4c, "%r11"=>0x011d8d4c,
- "%r12"=>0x01258d4c, "%r13"=>0x012d8d4c,
- "%r14"=>0x01358d4c, "%r15"=>0x013d8d4c );
-
- if ($line =~ /^\s*(\.\w+)/) {
+
+ # chain-call to cfi_directive
+ $ret = cfi_directive->re($line) and return $ret;
+
+ if ($$line =~ /^\s*(\.\w+)/) {
+ bless $self,$class;
$dir = $1;
$ret = $self;
undef $self->{value};
- $line = substr($line,@+[0]); $line =~ s/^\s+//;
+ $$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);
+ && do { $globals{$$line} = $prefix . $$line;
+ $$line = $globals{$$line} if ($prefix);
last;
};
- /\.type/ && do { ($sym,$type,$narg) = split(',',$line);
+ /\.type/ && do { my ($sym,$type,$narg) = split(',',$$line);
if ($type eq "\@function") {
undef $current_function;
$current_function->{name} = $sym;
$current_function->{name} = $sym;
$current_function->{scope} = defined($globals{$sym})?"PUBLIC":"PRIVATE";
}
- $line =~ s/\@abi\-omnipotent/\@function/;
- $line =~ s/\@function.*/\@function/;
+ $$line =~ s/\@abi\-omnipotent/\@function/;
+ $$line =~ s/\@function.*/\@function/;
last;
};
- /\.asciz/ && do { if ($line =~ /^"(.*)"$/) {
+ /\.asciz/ && do { if ($$line =~ /^"(.*)"$/) {
$dir = ".byte";
- $line = join(",",unpack("C*",$1),0);
+ $$line = join(",",unpack("C*",$1),0);
}
last;
};
/\.rva|\.long|\.quad/
- && do { $line =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
- $line =~ s/\.L/$decor/g;
+ && do { $$line =~ s/([_a-z][_a-z0-9]*)/$globals{$1} or $1/gei;
+ $$line =~ s/\.L/$decor/g;
last;
};
}
if ($gas) {
- $self->{value} = $dir . "\t" . $line;
+ $self->{value} = $dir . "\t" . $$line;
if ($dir =~ /\.extern/) {
$self->{value} = ""; # swallow extern
$self->{value} = ".def\t" . ($globals{$1} or $1) . ";\t" .
(defined($globals{$1})?".scl 2;":".scl 3;") .
"\t.type 32;\t.endef"
- if ($win64 && $line =~ /([^,]+),\@function/);
+ if ($win64 && $$line =~ /([^,]+),\@function/);
} elsif (!$elf && $dir =~ /\.size/) {
$self->{value} = "";
if (defined($current_function)) {
undef $current_function;
}
} elsif (!$elf && $dir =~ /\.align/) {
- $self->{value} = ".p2align\t" . (log($line)/log(2));
+ $self->{value} = ".p2align\t" . (log($$line)/log(2));
} elsif ($dir eq ".section") {
- $current_segment=$line;
+ $current_segment=$$line;
if (!$elf && $current_segment eq ".init") {
if ($flavour eq "macosx") { $self->{value} = ".mod_init_func"; }
elsif ($flavour eq "mingw64") { $self->{value} = ".section\t.ctors"; }
}
} elsif ($dir =~ /\.(text|data)/) {
$current_segment=".$1";
+ } elsif ($dir =~ /\.hidden/) {
+ if ($flavour eq "macosx") { $self->{value} = ".private_extern\t$prefix$$line"; }
+ elsif ($flavour eq "mingw64") { $self->{value} = ""; }
+ } elsif ($dir =~ /\.comm/) {
+ $self->{value} = "$dir\t$prefix$$line";
+ $self->{value} =~ s|,([0-9]+),([0-9]+)$|",$1,".log($2)/log(2)|e if ($flavour eq "macosx");
}
- $line = "";
+ $$line = "";
return $self;
}
$v="$current_segment\tENDS\n" if ($current_segment);
$current_segment = ".text\$";
$v.="$current_segment\tSEGMENT ";
- $v.=$masm>=$masmref ? "ALIGN(64)" : "PAGE";
+ $v.=$masm>=$masmref ? "ALIGN(256)" : "PAGE";
$v.=" 'CODE'";
}
$self->{value} = $v;
last;
};
/\.section/ && do { my $v=undef;
- $line =~ s/([^,]*).*/$1/;
- $line = ".CRT\$XCU" if ($line eq ".init");
+ $$line =~ s/([^,]*).*/$1/;
+ $$line = ".CRT\$XCU" if ($$line eq ".init");
if ($nasm) {
- $v="section $line";
- if ($line=~/\.([px])data/) {
+ $v="section $$line";
+ if ($$line=~/\.([px])data/) {
$v.=" rdata align=";
$v.=$1 eq "p"? 4 : 8;
+ } elsif ($$line=~/\.CRT\$/i) {
+ $v.=" rdata align=8";
}
} else {
$v="$current_segment\tENDS\n" if ($current_segment);
- $v.="$line\tSEGMENT";
- if ($line=~/\.([px])data/) {
+ $v.="$$line\tSEGMENT";
+ if ($$line=~/\.([px])data/) {
$v.=" READONLY";
$v.=" ALIGN(".($1 eq "p" ? 4 : 8).")" if ($masm>=$masmref);
+ } elsif ($$line=~/\.CRT\$/i) {
+ $v.=" READONLY ";
+ $v.=$masm>=$masmref ? "ALIGN(8)" : "DWORD";
}
}
- $current_segment = $line;
+ $current_segment = $$line;
$self->{value} = $v;
last;
};
- /\.extern/ && do { $self->{value} = "EXTERN\t".$line;
+ /\.extern/ && do { $self->{value} = "EXTERN\t".$$line;
$self->{value} .= ":NEAR" if ($masm);
last;
};
/\.globl|.global/
&& do { $self->{value} = $masm?"PUBLIC":"global";
- $self->{value} .= "\t".$line;
+ $self->{value} .= "\t".$$line;
last;
};
/\.size/ && do { if (defined($current_function)) {
$self->{value}="${decor}SEH_end_$current_function->{name}:";
$self->{value}.=":\n" if($masm);
}
- $self->{value}.="$current_function->{name}\tENDP" if($masm);
+ $self->{value}.="$current_function->{name}\tENDP" if($masm && $current_function->{name});
undef $current_function;
}
last;
};
- /\.align/ && do { $self->{value} = "ALIGN\t".$line; last; };
+ /\.align/ && do { my $max = ($masm && $masm>=$masmref) ? 256 : 4096;
+ $self->{value} = "ALIGN\t".($$line>$max?$max:$$line);
+ last;
+ };
/\.(value|long|rva|quad)/
&& do { my $sz = substr($1,0,1);
- my @arr = split(',',$line);
+ my @arr = split(/,\s*/,$$line);
my $last = pop(@arr);
my $conv = sub { my $var=shift;
$var=~s/^(0b[0-1]+)/oct($1)/eig;
- $var=~s/0x([0-9a-f]+)/0$1h/ig if ($masm);
+ $var=~s/^0x([0-9a-f]+)/0$1h/ig if ($masm);
if ($sz eq "D" && ($current_segment=~/.[px]data/ || $dir eq ".rva"))
- { $var=~s/([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
+ { $var=~s/^([_a-z\$\@][_a-z0-9\$\@]*)/$nasm?"$1 wrt ..imagebase":"imagerel $1"/egi; }
$var;
- };
+ };
$sz =~ tr/bvlrq/BWDDQ/;
$self->{value} = "\tD$sz\t";
$self->{value} .= &$conv($last);
last;
};
- /\.byte/ && do { my @str=split(",",$line);
+ /\.byte/ && do { my @str=split(/,\s*/,$$line);
map(s/(0b[0-1]+)/oct($1)/eig,@str);
- map(s/0x([0-9a-f]+)/0$1h/ig,@str) if ($masm);
+ map(s/0x([0-9a-f]+)/0$1h/ig,@str) if ($masm);
while ($#str>15) {
$self->{value}.="DB\t"
.join(",",@str[0..15])."\n";
.join(",",@str) if (@str);
last;
};
+ /\.comm/ && do { my @str=split(/,\s*/,$$line);
+ my $v=undef;
+ if ($nasm) {
+ $v.="common $prefix@str[0] @str[1]";
+ } else {
+ $v="$current_segment\tENDS\n" if ($current_segment);
+ $current_segment = "_DATA";
+ $v.="$current_segment\tSEGMENT\n";
+ $v.="COMM @str[0]:DWORD:".@str[1]/4;
+ }
+ $self->{value} = $v;
+ last;
+ };
}
- $line = "";
+ $$line = "";
}
$ret;
}
}
+# Upon initial x86_64 introduction SSE>2 extensions were not introduced
+# yet. In order not to be bothered by tracing exact assembler versions,
+# but at the same time to provide a bare security minimum of AES-NI, we
+# hard-code some instructions. Extensions past AES-NI on the other hand
+# are traced by examining assembler version in individual perlasm
+# modules...
+
+my %regrm = ( "%eax"=>0, "%ecx"=>1, "%edx"=>2, "%ebx"=>3,
+ "%esp"=>4, "%ebp"=>5, "%esi"=>6, "%edi"=>7 );
+
+sub rex {
+ my $opcode=shift;
+ my ($dst,$src,$rex)=@_;
+
+ $rex|=0x04 if($dst>=8);
+ $rex|=0x01 if($src>=8);
+ push @$opcode,($rex|0x40) if ($rex);
+}
+
+my $movq = sub { # elderly gas can't handle inter-register movq
+ my $arg = shift;
+ my @opcode=(0x66);
+ if ($arg =~ /%xmm([0-9]+),\s*%r(\w+)/) {
+ my ($src,$dst)=($1,$2);
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,$src,$dst,0x8);
+ push @opcode,0x0f,0x7e;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ @opcode;
+ } elsif ($arg =~ /%r(\w+),\s*%xmm([0-9]+)/) {
+ my ($src,$dst)=($2,$1);
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,$src,$dst,0x8);
+ push @opcode,0x0f,0x6e;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pextrd = sub {
+ if (shift =~ /\$([0-9]+),\s*%xmm([0-9]+),\s*(%\w+)/) {
+ my @opcode=(0x66);
+ my $imm=$1;
+ my $src=$2;
+ my $dst=$3;
+ if ($dst =~ /%r([0-9]+)d/) { $dst = $1; }
+ elsif ($dst =~ /%e/) { $dst = $regrm{$dst}; }
+ rex(\@opcode,$src,$dst);
+ push @opcode,0x0f,0x3a,0x16;
+ push @opcode,0xc0|(($src&7)<<3)|($dst&7); # ModR/M
+ push @opcode,$imm;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pinsrd = sub {
+ if (shift =~ /\$([0-9]+),\s*(%\w+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ my $imm=$1;
+ my $src=$2;
+ my $dst=$3;
+ if ($src =~ /%r([0-9]+)/) { $src = $1; }
+ elsif ($src =~ /%e/) { $src = $regrm{$src}; }
+ rex(\@opcode,$dst,$src);
+ push @opcode,0x0f,0x3a,0x22;
+ push @opcode,0xc0|(($dst&7)<<3)|($src&7); # ModR/M
+ push @opcode,$imm;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pshufb = sub {
+ if (shift =~ /%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$2,$1);
+ push @opcode,0x0f,0x38,0x00;
+ push @opcode,0xc0|($1&7)|(($2&7)<<3); # ModR/M
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $palignr = sub {
+ if (shift =~ /\$([0-9]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$3,$2);
+ push @opcode,0x0f,0x3a,0x0f;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ push @opcode,$1;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $pclmulqdq = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x66);
+ rex(\@opcode,$3,$2);
+ push @opcode,0x0f,0x3a,0x44;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $rdrand = sub {
+ if (shift =~ /%[er](\w+)/) {
+ my @opcode=();
+ my $dst=$1;
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,0,$dst,8);
+ push @opcode,0x0f,0xc7,0xf0|($dst&7);
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $rdseed = sub {
+ if (shift =~ /%[er](\w+)/) {
+ my @opcode=();
+ my $dst=$1;
+ if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+ rex(\@opcode,0,$dst,8);
+ push @opcode,0x0f,0xc7,0xf8|($dst&7);
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+# Not all AVX-capable assemblers recognize AMD XOP extension. Since we
+# are using only two instructions hand-code them in order to be excused
+# from chasing assembler versions...
+
+sub rxb {
+ my $opcode=shift;
+ my ($dst,$src1,$src2,$rxb)=@_;
+
+ $rxb|=0x7<<5;
+ $rxb&=~(0x04<<5) if($dst>=8);
+ $rxb&=~(0x01<<5) if($src1>=8);
+ $rxb&=~(0x02<<5) if($src2>=8);
+ push @$opcode,$rxb;
+}
+
+my $vprotd = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x8f);
+ rxb(\@opcode,$3,$2,-1,0x08);
+ push @opcode,0x78,0xc2;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+my $vprotq = sub {
+ if (shift =~ /\$([x0-9a-f]+),\s*%xmm([0-9]+),\s*%xmm([0-9]+)/) {
+ my @opcode=(0x8f);
+ rxb(\@opcode,$3,$2,-1,0x08);
+ push @opcode,0x78,0xc3;
+ push @opcode,0xc0|($2&7)|(($3&7)<<3); # ModR/M
+ my $c=$1;
+ push @opcode,$c=~/^0/?oct($c):$c;
+ @opcode;
+ } else {
+ ();
+ }
+};
+
+# Intel Control-flow Enforcement Technology extension. All functions and
+# indirect branch targets will have to start with this instruction...
+
+my $endbranch = sub {
+ (0xf3,0x0f,0x1e,0xfa);
+};
+
+########################################################################
+
if ($nasm) {
print <<___;
default rel
+%define XMMWORD
+%define YMMWORD
+%define ZMMWORD
___
} elsif ($masm) {
print <<___;
OPTION DOTNAME
___
}
-while($line=<>) {
+while(defined(my $line=<>)) {
- chomp($line);
+ $line =~ s|\R$||; # Better chomp
$line =~ s|[#!].*$||; # get rid of asm-style comments...
$line =~ s|/\*.*\*/||; # ... and C-style comments...
$line =~ s|^\s+||; # ... and skip white spaces in beginning
+ $line =~ s|\s+$||; # ... and at the end
+
+ if (my $label=label->re(\$line)) { print $label->out(); }
- undef $label;
- undef $opcode;
- undef $sz;
- undef @args;
+ if (my $directive=directive->re(\$line)) {
+ printf "%s",$directive->out();
+ } elsif (my $opcode=opcode->re(\$line)) {
+ my $asm = eval("\$".$opcode->mnemonic());
- if ($label=label->re(\$line)) { print $label->out(); }
+ if ((ref($asm) eq 'CODE') && scalar(my @bytes=&$asm($line))) {
+ print $gas?".byte\t":"DB\t",join(',',@bytes),"\n";
+ next;
+ }
- if (directive->re(\$line)) {
- printf "%s",directive->out();
- } elsif ($opcode=opcode->re(\$line)) { ARGUMENT: while (1) {
- my $arg;
+ my @args;
+ ARGUMENT: while (1) {
+ my $arg;
- if ($arg=register->re(\$line)) { opcode->size($arg->size()); }
- elsif ($arg=const->re(\$line)) { }
- elsif ($arg=ea->re(\$line)) { }
- elsif ($arg=expr->re(\$line)) { }
- else { last ARGUMENT; }
+ ($arg=register->re(\$line, $opcode))||
+ ($arg=const->re(\$line)) ||
+ ($arg=ea->re(\$line, $opcode)) ||
+ ($arg=expr->re(\$line, $opcode)) ||
+ last ARGUMENT;
- push @args,$arg;
+ push @args,$arg;
- last ARGUMENT if ($line !~ /^,/);
+ last ARGUMENT if ($line !~ /^,/);
- $line =~ s/^,\s*//;
+ $line =~ s/^,\s*//;
} # ARGUMENT:
- $sz=opcode->size();
-
if ($#args>=0) {
my $insn;
+ my $sz=$opcode->size();
+
if ($gas) {
$insn = $opcode->out($#args>=1?$args[$#args]->size():$sz);
+ @args = map($_->out($sz),@args);
+ printf "\t%s\t%s",$insn,join(",",@args);
} else {
$insn = $opcode->out();
- $insn .= $sz if (map($_->out() =~ /xmm|mmx/,@args));
+ foreach (@args) {
+ my $arg = $_->out();
+ # $insn.=$sz compensates for movq, pinsrw, ...
+ if ($arg =~ /^xmm[0-9]+$/) { $insn.=$sz; $sz="x" if(!$sz); last; }
+ if ($arg =~ /^ymm[0-9]+$/) { $insn.=$sz; $sz="y" if(!$sz); last; }
+ if ($arg =~ /^zmm[0-9]+$/) { $insn.=$sz; $sz="z" if(!$sz); last; }
+ if ($arg =~ /^mm[0-9]+$/) { $insn.=$sz; $sz="q" if(!$sz); last; }
+ }
@args = reverse(@args);
undef $sz if ($nasm && $opcode->mnemonic() eq "lea");
+ printf "\t%s\t%s",$insn,join(",",map($_->out($sz),@args));
}
- printf "\t%s\t%s",$insn,join(",",map($_->out($sz),@args));
} else {
printf "\t%s",$opcode->out();
}
# %r13 - -
# %r14 - -
# %r15 - -
-#
+#
# (*) volatile register
# (-) preserved by callee
# (#) Nth argument, volatile
#
# In Unix terms top of stack is argument transfer area for arguments
-# which could not be accomodated in registers. Or in other words 7th
+# which could not be accommodated in registers. Or in other words 7th
# [integer] argument resides at 8(%rsp) upon function entry point.
# 128 bytes above %rsp constitute a "red zone" which is not touched
# by signal handlers and can be used as temporal storage without
# the area above user stack pointer in true asynchronous manner...
#
# All the above means that if assembler programmer adheres to Unix
-# register and stack layout, but disregards the "red zone" existense,
+# register and stack layout, but disregards the "red zone" existence,
# it's possible to use following prologue and epilogue to "gear" from
# Unix to Win64 ABI in leaf functions with not more than 6 arguments.
#
# movq -16(%rcx),%rbx
# movq -8(%rcx),%r15
# movq %rcx,%rsp # restore original rsp
+# magic_epilogue:
# ret
# .size function,.-function
#
# EXCEPTION_DISPOSITION handler (EXCEPTION_RECORD *rec,ULONG64 frame,
# CONTEXT *context,DISPATCHER_CONTEXT *disp)
# { ULONG64 *rsp = (ULONG64 *)context->Rax;
-# if (context->Rip >= magic_point)
-# { rsp = ((ULONG64 **)context->Rsp)[0];
-# context->Rbp = rsp[-3];
-# context->Rbx = rsp[-2];
-# context->R15 = rsp[-1];
+# ULONG64 rip = context->Rip;
+#
+# if (rip >= magic_point)
+# { rsp = (ULONG64 *)context->Rsp;
+# if (rip < magic_epilogue)
+# { rsp = (ULONG64 *)rsp[0];
+# context->Rbp = rsp[-3];
+# context->Rbx = rsp[-2];
+# context->R15 = rsp[-1];
+# }
# }
# context->Rsp = (ULONG64)rsp;
# context->Rdi = rsp[1];
# .rva .LSEH_end_function
# .rva function_unwind_info
#
-# Reference to functon_unwind_info from .xdata segment is the anchor.
+# Reference to function_unwind_info from .xdata segment is the anchor.
# 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.
# instruction and reflecting it in finer grade unwind logic in handler.
# After all, isn't it why it's called *language-specific* handler...
#
-# Attentive reader can notice that exceptions would be mishandled in
-# auto-generated "gear" epilogue. Well, exception effectively can't
-# occur there, because if memory area used by it was subject to
-# segmentation violation, then it would be raised upon call to the
-# function (and as already mentioned be accounted to caller, which is
-# not a problem). If you're still not comfortable, then define tail
-# "magic point" just prior ret instruction and have handler treat it...
+# SE handlers are also involved in unwinding stack when executable is
+# profiled or debugged. Profiling implies additional limitations that
+# are too subtle to discuss here. For now it's sufficient to say that
+# in order to simplify handlers one should either a) offload original
+# %rsp to stack (like discussed above); or b) if you have a register to
+# spare for frame pointer, choose volatile one.
#
# (*) Note that we're talking about run-time, not debug-time. Lack of
# unwind information makes debugging hard on both Windows and
-# Unix. "Unlike" referes to the fact that on Unix signal handler
+# Unix. "Unlike" refers to the fact that on Unix signal handler
# will always be invoked, core dumped and appropriate exit code
# returned to parent (for user notification).
projects / openssl.git / blobdiff