| 1 |
#!/opt/bin/perl |
| 2 |
|
| 3 |
{ |
| 4 |
package Coro::State; |
| 5 |
|
| 6 |
use common::sense; |
| 7 |
|
| 8 |
my @insn; |
| 9 |
|
| 10 |
$insn[0][1] = "\x0f\xb6"; # movzbl mem -> rax |
| 11 |
$insn[0][2] = "\x0f\xb7"; # movzwl mem -> rax |
| 12 |
$insn[0][4] = "\x8b"; # movl mem -> rax |
| 13 |
$insn[0][8] = "\x48\x8b"; # movq mem -> rax |
| 14 |
$insn[1][1] = "\x88"; # movb al -> mem |
| 15 |
$insn[1][2] = "\x66\x89"; # movw ax -> mem |
| 16 |
$insn[1][4] = "\x89"; # movl eax -> mem |
| 17 |
$insn[1][8] = "\x48\x89"; # movq rax -> mem |
| 18 |
|
| 19 |
my $modrm_disp8 = 0x40; |
| 20 |
my $modrm_disp32 = 0x80; |
| 21 |
my $modrm_rsi = 0x06; |
| 22 |
my $modrm_rdi = 0x07; |
| 23 |
|
| 24 |
my @vars; |
| 25 |
|
| 26 |
my $mov_ind = sub { |
| 27 |
my ($size, $mod_rm, $store, $offset) = @_; |
| 28 |
|
| 29 |
if ($offset < -128 || $offset > 127) { |
| 30 |
$mod_rm |= $modrm_disp32; |
| 31 |
$offset = pack "V", $offset; |
| 32 |
} elsif ($offset) { |
| 33 |
$mod_rm |= $modrm_disp8; |
| 34 |
$offset = pack "c", $offset; |
| 35 |
} else { |
| 36 |
$offset = ""; |
| 37 |
} |
| 38 |
|
| 39 |
$insn[$store][$size] . (chr $mod_rm) . $offset |
| 40 |
}; |
| 41 |
|
| 42 |
my $gencopy = sub { |
| 43 |
my ($save) = shift; |
| 44 |
|
| 45 |
my $curbase = undef; |
| 46 |
|
| 47 |
my $code; |
| 48 |
|
| 49 |
my $curslot = 0; |
| 50 |
|
| 51 |
for (@vars) { |
| 52 |
my ($addr, $asize, $slot, $ssize) = @$_; |
| 53 |
|
| 54 |
if (!defined $curbase || abs ($curbase - $addr) > 0x7ffffff) { |
| 55 |
$curbase = $addr + 128; |
| 56 |
$code .= "\x48\xbe" . pack "Q", $curbase; # mov imm64, %rsi |
| 57 |
} |
| 58 |
|
| 59 |
my $slotofs = $slot - $curslot; |
| 60 |
|
| 61 |
# the sort ensures that this condition and adjustment suffices |
| 62 |
if ($slotofs > 127) { |
| 63 |
my $adj = 256; |
| 64 |
$code .= "\x48\x81\xc7" . pack "i", $adj; # addq imm32, %rdi |
| 65 |
$curslot += $adj; |
| 66 |
$slotofs -= $adj; |
| 67 |
} |
| 68 |
|
| 69 |
if ($save) { |
| 70 |
$code .= $mov_ind->($asize, $modrm_rsi, 0, $addr - $curbase); |
| 71 |
$code .= $mov_ind->($ssize, $modrm_rdi, 1, $slotofs); |
| 72 |
} else { |
| 73 |
$code .= $mov_ind->($ssize, $modrm_rdi, 0, $slotofs); |
| 74 |
$code .= $mov_ind->($asize, $modrm_rsi, 1, $addr - $curbase); |
| 75 |
} |
| 76 |
} |
| 77 |
|
| 78 |
$code .= "\xc3"; # retq |
| 79 |
|
| 80 |
$code |
| 81 |
}; |
| 82 |
|
| 83 |
sub _jit { |
| 84 |
@vars = @_; |
| 85 |
|
| 86 |
# sort all variables into 256 byte blocks, biased by -128 |
| 87 |
# so gencopy can += 256 occasionally. within those blocks, |
| 88 |
# sort by address so we can play further tricks. |
| 89 |
@vars = sort { |
| 90 |
(($a->[2] + 128) & ~255) <=> (($b->[2] + 128) & ~255) |
| 91 |
or $a->[0] <=> $b->[0] |
| 92 |
} @vars; |
| 93 |
|
| 94 |
# we *could* combine adjacent vars, but this is not very common |
| 95 |
|
| 96 |
my $load = $gencopy->(0); |
| 97 |
my $save = $gencopy->(1); |
| 98 |
|
| 99 |
#open my $fh, ">dat"; syswrite $fh, $save; system "objdump -b binary -m i386 -M x86-64 -D dat";#d# |
| 100 |
#warn length $load;#d# |
| 101 |
#warn length $save;#d# |
| 102 |
|
| 103 |
($load, $save) |
| 104 |
} |
| 105 |
} |
| 106 |
|
| 107 |
1 |
