crypto/sha/asm/sha512-ppc.pl

   1 #!/usr/bin/env perl
   2
   3 # ====================================================================
   4 # Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
   5 # project. The module is, however, dual licensed under OpenSSL and
   6 # CRYPTOGAMS licenses depending on where you obtain it. For further
   7 # details see http://www.openssl.org/~appro/cryptogams/.
   8 # ====================================================================
   9
  10 # I let hardware handle unaligned input, except on page boundaries
  11 # (see below for details). Otherwise straightforward implementation
  12 # with X vector in register bank. The module is big-endian [which is
  13 # not big deal as there're no little-endian targets left around].
  14
  15 #                       sha256          |       sha512
  16 #                       -m64    -m32    |       -m64    -m32
  17 # --------------------------------------+-----------------------
  18 # PPC970,gcc-4.0.0      +50%    +38%    |       +40%    +410%(*)
  19 # Power6,xlc-7          +150%   +90%    |       +100%   +430%(*)
  20 #
  21 # (*)   64-bit code in 32-bit application context, which actually is
  22 #       on TODO list. It should be noted that for safe deployment in
  23 #       32-bit *mutli-threaded* context asyncronous signals should be
  24 #       blocked upon entry to SHA512 block routine. This is because
  25 #       32-bit signaling procedure invalidates upper halves of GPRs.
  26 #       Context switch procedure preserves them, but not signaling:-(
  27
  28 # Second version is true multi-thread safe. Trouble with the original
  29 # version was that it was using thread local storage pointer register.
  30 # Well, it scrupulously preserved it, but the problem would arise the
  31 # moment asynchronous signal was delivered and signal handler would
  32 # dereference the TLS pointer. While it's never the case in openssl
  33 # application or test suite, we have to respect this scenario and not
  34 # use TLS pointer register. Alternative would be to require caller to
  35 # block signals prior calling this routine. For the record, in 32-bit
  36 # context R2 serves as TLS pointer, while in 64-bit context - R13.
  37
  38 $flavour=shift;
  39 $output =shift;
  40
  41 if ($flavour =~ /64/) {
  42         $SIZE_T=8;
  43         $LRSAVE=2*$SIZE_T;
  44         $STU="stdu";
  45         $UCMP="cmpld";
  46         $SHL="sldi";
  47         $POP="ld";
  48         $PUSH="std";
  49 } elsif ($flavour =~ /32/) {
  50         $SIZE_T=4;
  51         $LRSAVE=$SIZE_T;
  52         $STU="stwu";
  53         $UCMP="cmplw";
  54         $SHL="slwi";
  55         $POP="lwz";
  56         $PUSH="stw";
  57 } else { die "nonsense $flavour"; }
  58
  59 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  60 ( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
  61 ( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
  62 die "can't locate ppc-xlate.pl";
  63
  64 open STDOUT,"| $^X $xlate $flavour $output" || die "can't call $xlate: $!";
  65
  66 if ($output =~ /512/) {
  67         $func="sha512_block_data_order";
  68         $SZ=8;
  69         @Sigma0=(28,34,39);
  70         @Sigma1=(14,18,41);
  71         @sigma0=(1,  8, 7);
  72         @sigma1=(19,61, 6);
  73         $rounds=80;
  74         $LD="ld";
  75         $ST="std";
  76         $ROR="rotrdi";
  77         $SHR="srdi";
  78 } else {
  79         $func="sha256_block_data_order";
  80         $SZ=4;
  81         @Sigma0=( 2,13,22);
  82         @Sigma1=( 6,11,25);
  83         @sigma0=( 7,18, 3);
  84         @sigma1=(17,19,10);
  85         $rounds=64;
  86         $LD="lwz";
  87         $ST="stw";
  88         $ROR="rotrwi";
  89         $SHR="srwi";
  90 }
  91
  92 $FRAME=32*$SIZE_T+16*$SZ;
  93 $LOCALS=6*$SIZE_T;
  94
  95 $sp ="r1";
  96 $toc="r2";
  97 $ctx="r3";      # zapped by $a0
  98 $inp="r4";      # zapped by $a1
  99 $num="r5";      # zapped by $t0
 100
 101 $T  ="r0";
 102 $a0 ="r3";
 103 $a1 ="r4";
 104 $t0 ="r5";
 105 $t1 ="r6";
 106 $Tbl="r7";
 107
 108 $A  ="r8";
 109 $B  ="r9";
 110 $C  ="r10";
 111 $D  ="r11";
 112 $E  ="r12";
 113 $F  =$t1;       $t1 = "r0";     # stay away from "r13";
 114 $G  ="r14";
 115 $H  ="r15";
 116
 117 @V=($A,$B,$C,$D,$E,$F,$G,$H);
 118 @X=("r16","r17","r18","r19","r20","r21","r22","r23",
 119     "r24","r25","r26","r27","r28","r29","r30","r31");
 120
 121 $inp="r31";     # reassigned $inp! aliases with @X[15]
 122
 123 sub ROUND_00_15 {
 124 my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
 125 $code.=<<___;
 126         $ROR    $a0,$e,$Sigma1[0]
 127         $ROR    $a1,$e,$Sigma1[1]
 128         and     $t0,$f,$e
 129         xor     $a0,$a0,$a1
 130         add     $h,$h,$t1
 131         andc    $t1,$g,$e
 132         $ROR    $a1,$a1,`$Sigma1[2]-$Sigma1[1]`
 133         or      $t0,$t0,$t1             ; Ch(e,f,g)
 134         add     $h,$h,@X[$i%16]
 135         xor     $a0,$a0,$a1             ; Sigma1(e)
 136         add     $h,$h,$t0
 137         add     $h,$h,$a0
 138
 139         $ROR    $a0,$a,$Sigma0[0]
 140         $ROR    $a1,$a,$Sigma0[1]
 141         and     $t0,$a,$b
 142         and     $t1,$a,$c
 143         xor     $a0,$a0,$a1
 144         $ROR    $a1,$a1,`$Sigma0[2]-$Sigma0[1]`
 145         xor     $t0,$t0,$t1
 146         and     $t1,$b,$c
 147         xor     $a0,$a0,$a1             ; Sigma0(a)
 148         add     $d,$d,$h
 149         xor     $t0,$t0,$t1             ; Maj(a,b,c)
 150 ___
 151 $code.=<<___ if ($i<15);
 152         $LD     $t1,`($i+1)*$SZ`($Tbl)
 153 ___
 154 $code.=<<___;
 155         add     $h,$h,$a0
 156         add     $h,$h,$t0
 157
 158 ___
 159 }
 160
 161 sub ROUND_16_xx {
 162 my ($i,$a,$b,$c,$d,$e,$f,$g,$h)=@_;
 163 $i-=16;
 164 $code.=<<___;
 165         $ROR    $a0,@X[($i+1)%16],$sigma0[0]
 166         $ROR    $a1,@X[($i+1)%16],$sigma0[1]
 167         $ROR    $t0,@X[($i+14)%16],$sigma1[0]
 168         $ROR    $t1,@X[($i+14)%16],$sigma1[1]
 169         xor     $a0,$a0,$a1
 170         $SHR    $a1,@X[($i+1)%16],$sigma0[2]
 171         xor     $t0,$t0,$t1
 172         $SHR    $t1,@X[($i+14)%16],$sigma1[2]
 173         add     @X[$i],@X[$i],@X[($i+9)%16]
 174         xor     $a0,$a0,$a1             ; sigma0(X[(i+1)&0x0f])
 175         xor     $t0,$t0,$t1             ; sigma1(X[(i+14)&0x0f])
 176         $LD     $t1,`$i*$SZ`($Tbl)
 177         add     @X[$i],@X[$i],$a0
 178         add     @X[$i],@X[$i],$t0
 179 ___
 180 &ROUND_00_15($i+16,$a,$b,$c,$d,$e,$f,$g,$h);
 181 }
 182
 183 $code=<<___;
 184 .machine        "any"
 185 .text
 186
 187 .globl  $func
 188 .align  6
 189 $func:
 190         $STU    $sp,-$FRAME($sp)
 191         mflr    r0
 192         $SHL    $num,$num,`log(16*$SZ)/log(2)`
 193
 194         $PUSH   $ctx,`$FRAME-$SIZE_T*22`($sp)
 195
 196         $PUSH   r14,`$FRAME-$SIZE_T*18`($sp)
 197         $PUSH   r15,`$FRAME-$SIZE_T*17`($sp)
 198         $PUSH   r16,`$FRAME-$SIZE_T*16`($sp)
 199         $PUSH   r17,`$FRAME-$SIZE_T*15`($sp)
 200         $PUSH   r18,`$FRAME-$SIZE_T*14`($sp)
 201         $PUSH   r19,`$FRAME-$SIZE_T*13`($sp)
 202         $PUSH   r20,`$FRAME-$SIZE_T*12`($sp)
 203         $PUSH   r21,`$FRAME-$SIZE_T*11`($sp)
 204         $PUSH   r22,`$FRAME-$SIZE_T*10`($sp)
 205         $PUSH   r23,`$FRAME-$SIZE_T*9`($sp)
 206         $PUSH   r24,`$FRAME-$SIZE_T*8`($sp)
 207         $PUSH   r25,`$FRAME-$SIZE_T*7`($sp)
 208         $PUSH   r26,`$FRAME-$SIZE_T*6`($sp)
 209         $PUSH   r27,`$FRAME-$SIZE_T*5`($sp)
 210         $PUSH   r28,`$FRAME-$SIZE_T*4`($sp)
 211         $PUSH   r29,`$FRAME-$SIZE_T*3`($sp)
 212         $PUSH   r30,`$FRAME-$SIZE_T*2`($sp)
 213         $PUSH   r31,`$FRAME-$SIZE_T*1`($sp)
 214         $PUSH   r0,`$FRAME+$LRSAVE`($sp)
 215
 216         $LD     $A,`0*$SZ`($ctx)
 217         mr      $inp,r4                         ; incarnate $inp
 218         $LD     $B,`1*$SZ`($ctx)
 219         $LD     $C,`2*$SZ`($ctx)
 220         $LD     $D,`3*$SZ`($ctx)
 221         $LD     $E,`4*$SZ`($ctx)
 222         $LD     $F,`5*$SZ`($ctx)
 223         $LD     $G,`6*$SZ`($ctx)
 224         $LD     $H,`7*$SZ`($ctx)
 225
 226         bl      LPICmeup
 227 LPICedup:
 228         andi.   r0,$inp,3
 229         bne     Lunaligned
 230 Laligned:
 231         add     $num,$inp,$num
 232         $PUSH   $num,`$FRAME-$SIZE_T*24`($sp)   ; end pointer
 233         $PUSH   $inp,`$FRAME-$SIZE_T*23`($sp)   ; inp pointer
 234         bl      Lsha2_block_private
 235         b       Ldone
 236
 237 ; PowerPC specification allows an implementation to be ill-behaved
 238 ; upon unaligned access which crosses page boundary. "Better safe
 239 ; than sorry" principle makes me treat it specially. But I don't
 240 ; look for particular offending word, but rather for the input
 241 ; block which crosses the boundary. Once found that block is aligned
 242 ; and hashed separately...
 243 .align  4
 244 Lunaligned:
 245         subfic  $t1,$inp,4096
 246         andi.   $t1,$t1,`4096-16*$SZ`   ; distance to closest page boundary
 247         beq     Lcross_page
 248         $UCMP   $num,$t1
 249         ble-    Laligned                ; didn't cross the page boundary
 250         subfc   $num,$t1,$num
 251         add     $t1,$inp,$t1
 252         $PUSH   $num,`$FRAME-$SIZE_T*25`($sp)   ; save real remaining num
 253         $PUSH   $t1,`$FRAME-$SIZE_T*24`($sp)    ; intermediate end pointer
 254         $PUSH   $inp,`$FRAME-$SIZE_T*23`($sp)   ; inp pointer
 255         bl      Lsha2_block_private
 256         ; $inp equals to the intermediate end pointer here
 257         $POP    $num,`$FRAME-$SIZE_T*25`($sp)   ; restore real remaining num
 258 Lcross_page:
 259         li      $t1,`16*$SZ/4`
 260         mtctr   $t1
 261         addi    r20,$sp,$LOCALS                 ; aligned spot below the frame
 262 Lmemcpy:
 263         lbz     r16,0($inp)
 264         lbz     r17,1($inp)
 265         lbz     r18,2($inp)
 266         lbz     r19,3($inp)
 267         addi    $inp,$inp,4
 268         stb     r16,0(r20)
 269         stb     r17,1(r20)
 270         stb     r18,2(r20)
 271         stb     r19,3(r20)
 272         addi    r20,r20,4
 273         bdnz    Lmemcpy
 274
 275         $PUSH   $inp,`$FRAME-$SIZE_T*26`($sp)   ; save real inp
 276         addi    $t1,$sp,`$LOCALS+16*$SZ`        ; fictitious end pointer
 277         addi    $inp,$sp,$LOCALS                ; fictitious inp pointer
 278         $PUSH   $num,`$FRAME-$SIZE_T*25`($sp)   ; save real num
 279         $PUSH   $t1,`$FRAME-$SIZE_T*24`($sp)    ; end pointer
 280         $PUSH   $inp,`$FRAME-$SIZE_T*23`($sp)   ; inp pointer
 281         bl      Lsha2_block_private
 282         $POP    $inp,`$FRAME-$SIZE_T*26`($sp)   ; restore real inp
 283         $POP    $num,`$FRAME-$SIZE_T*25`($sp)   ; restore real num
 284         addic.  $num,$num,`-16*$SZ`             ; num--
 285         bne-    Lunaligned
 286
 287 Ldone:
 288         $POP    r0,`$FRAME+$LRSAVE`($sp)
 289         $POP    r14,`$FRAME-$SIZE_T*18`($sp)
 290         $POP    r15,`$FRAME-$SIZE_T*17`($sp)
 291         $POP    r16,`$FRAME-$SIZE_T*16`($sp)
 292         $POP    r17,`$FRAME-$SIZE_T*15`($sp)
 293         $POP    r18,`$FRAME-$SIZE_T*14`($sp)
 294         $POP    r19,`$FRAME-$SIZE_T*13`($sp)
 295         $POP    r20,`$FRAME-$SIZE_T*12`($sp)
 296         $POP    r21,`$FRAME-$SIZE_T*11`($sp)
 297         $POP    r22,`$FRAME-$SIZE_T*10`($sp)
 298         $POP    r23,`$FRAME-$SIZE_T*9`($sp)
 299         $POP    r24,`$FRAME-$SIZE_T*8`($sp)
 300         $POP    r25,`$FRAME-$SIZE_T*7`($sp)
 301         $POP    r26,`$FRAME-$SIZE_T*6`($sp)
 302         $POP    r27,`$FRAME-$SIZE_T*5`($sp)
 303         $POP    r28,`$FRAME-$SIZE_T*4`($sp)
 304         $POP    r29,`$FRAME-$SIZE_T*3`($sp)
 305         $POP    r30,`$FRAME-$SIZE_T*2`($sp)
 306         $POP    r31,`$FRAME-$SIZE_T*1`($sp)
 307         mtlr    r0
 308         addi    $sp,$sp,$FRAME
 309         blr
 310         .long   0
 311         .byte   0,12,4,1,0x80,18,3,0
 312         .long   0
 313
 314 .align  4
 315 Lsha2_block_private:
 316         $LD     $t1,0($Tbl)
 317 ___
 318 for($i=0;$i<16;$i++) {
 319 $code.=<<___ if ($SZ==4);
 320         lwz     @X[$i],`$i*$SZ`($inp)
 321 ___
 322 # 64-bit loads are split to 2x32-bit ones, as CPU can't handle
 323 # unaligned 64-bit loads, only 32-bit ones...
 324 $code.=<<___ if ($SZ==8);
 325         lwz     $t0,`$i*$SZ`($inp)
 326         lwz     @X[$i],`$i*$SZ+4`($inp)
 327         insrdi  @X[$i],$t0,32,0
 328 ___
 329         &ROUND_00_15($i,@V);
 330         unshift(@V,pop(@V));
 331 }
 332 $code.=<<___;
 333         li      $t0,`$rounds/16-1`
 334         mtctr   $t0
 335 .align  4
 336 Lrounds:
 337         addi    $Tbl,$Tbl,`16*$SZ`
 338 ___
 339 for(;$i<32;$i++) {
 340         &ROUND_16_xx($i,@V);
 341         unshift(@V,pop(@V));
 342 }
 343 $code.=<<___;
 344         bdnz-   Lrounds
 345
 346         $POP    $ctx,`$FRAME-$SIZE_T*22`($sp)
 347         $POP    $inp,`$FRAME-$SIZE_T*23`($sp)   ; inp pointer
 348         $POP    $num,`$FRAME-$SIZE_T*24`($sp)   ; end pointer
 349         subi    $Tbl,$Tbl,`($rounds-16)*$SZ`    ; rewind Tbl
 350
 351         $LD     r16,`0*$SZ`($ctx)
 352         $LD     r17,`1*$SZ`($ctx)
 353         $LD     r18,`2*$SZ`($ctx)
 354         $LD     r19,`3*$SZ`($ctx)
 355         $LD     r20,`4*$SZ`($ctx)
 356         $LD     r21,`5*$SZ`($ctx)
 357         $LD     r22,`6*$SZ`($ctx)
 358         addi    $inp,$inp,`16*$SZ`              ; advance inp
 359         $LD     r23,`7*$SZ`($ctx)
 360         add     $A,$A,r16
 361         add     $B,$B,r17
 362         $PUSH   $inp,`$FRAME-$SIZE_T*23`($sp)
 363         add     $C,$C,r18
 364         $ST     $A,`0*$SZ`($ctx)
 365         add     $D,$D,r19
 366         $ST     $B,`1*$SZ`($ctx)
 367         add     $E,$E,r20
 368         $ST     $C,`2*$SZ`($ctx)
 369         add     $F,$F,r21
 370         $ST     $D,`3*$SZ`($ctx)
 371         add     $G,$G,r22
 372         $ST     $E,`4*$SZ`($ctx)
 373         add     $H,$H,r23
 374         $ST     $F,`5*$SZ`($ctx)
 375         $ST     $G,`6*$SZ`($ctx)
 376         $UCMP   $inp,$num
 377         $ST     $H,`7*$SZ`($ctx)
 378         bne     Lsha2_block_private
 379         blr
 380         .long   0
 381         .byte   0,12,0x14,0,0,0,0,0
 382 ___
 383
 384 # Ugly hack here, because PPC assembler syntax seem to vary too
 385 # much from platforms to platform...
 386 $code.=<<___;
 387 .align  6
 388 LPICmeup:
 389         mflr    r0
 390         bcl     20,31,\$+4
 391         mflr    $Tbl    ; vvvvvv "distance" between . and 1st data entry
 392         addi    $Tbl,$Tbl,`64-8`
 393         mtlr    r0
 394         blr
 395         .long   0
 396         .byte   0,12,0x14,0,0,0,0,0
 397         .space  `64-9*4`
 398 ___
 399 $code.=<<___ if ($SZ==8);
 400         .long   0x428a2f98,0xd728ae22,0x71374491,0x23ef65cd
 401         .long   0xb5c0fbcf,0xec4d3b2f,0xe9b5dba5,0x8189dbbc
 402         .long   0x3956c25b,0xf348b538,0x59f111f1,0xb605d019
 403         .long   0x923f82a4,0xaf194f9b,0xab1c5ed5,0xda6d8118
 404         .long   0xd807aa98,0xa3030242,0x12835b01,0x45706fbe
 405         .long   0x243185be,0x4ee4b28c,0x550c7dc3,0xd5ffb4e2
 406         .long   0x72be5d74,0xf27b896f,0x80deb1fe,0x3b1696b1
 407         .long   0x9bdc06a7,0x25c71235,0xc19bf174,0xcf692694
 408         .long   0xe49b69c1,0x9ef14ad2,0xefbe4786,0x384f25e3
 409         .long   0x0fc19dc6,0x8b8cd5b5,0x240ca1cc,0x77ac9c65
 410         .long   0x2de92c6f,0x592b0275,0x4a7484aa,0x6ea6e483
 411         .long   0x5cb0a9dc,0xbd41fbd4,0x76f988da,0x831153b5
 412         .long   0x983e5152,0xee66dfab,0xa831c66d,0x2db43210
 413         .long   0xb00327c8,0x98fb213f,0xbf597fc7,0xbeef0ee4
 414         .long   0xc6e00bf3,0x3da88fc2,0xd5a79147,0x930aa725
 415         .long   0x06ca6351,0xe003826f,0x14292967,0x0a0e6e70
 416         .long   0x27b70a85,0x46d22ffc,0x2e1b2138,0x5c26c926
 417         .long   0x4d2c6dfc,0x5ac42aed,0x53380d13,0x9d95b3df
 418         .long   0x650a7354,0x8baf63de,0x766a0abb,0x3c77b2a8
 419         .long   0x81c2c92e,0x47edaee6,0x92722c85,0x1482353b
 420         .long   0xa2bfe8a1,0x4cf10364,0xa81a664b,0xbc423001
 421         .long   0xc24b8b70,0xd0f89791,0xc76c51a3,0x0654be30
 422         .long   0xd192e819,0xd6ef5218,0xd6990624,0x5565a910
 423         .long   0xf40e3585,0x5771202a,0x106aa070,0x32bbd1b8
 424         .long   0x19a4c116,0xb8d2d0c8,0x1e376c08,0x5141ab53
 425         .long   0x2748774c,0xdf8eeb99,0x34b0bcb5,0xe19b48a8
 426         .long   0x391c0cb3,0xc5c95a63,0x4ed8aa4a,0xe3418acb
 427         .long   0x5b9cca4f,0x7763e373,0x682e6ff3,0xd6b2b8a3
 428         .long   0x748f82ee,0x5defb2fc,0x78a5636f,0x43172f60
 429         .long   0x84c87814,0xa1f0ab72,0x8cc70208,0x1a6439ec
 430         .long   0x90befffa,0x23631e28,0xa4506ceb,0xde82bde9
 431         .long   0xbef9a3f7,0xb2c67915,0xc67178f2,0xe372532b
 432         .long   0xca273ece,0xea26619c,0xd186b8c7,0x21c0c207
 433         .long   0xeada7dd6,0xcde0eb1e,0xf57d4f7f,0xee6ed178
 434         .long   0x06f067aa,0x72176fba,0x0a637dc5,0xa2c898a6
 435         .long   0x113f9804,0xbef90dae,0x1b710b35,0x131c471b
 436         .long   0x28db77f5,0x23047d84,0x32caab7b,0x40c72493
 437         .long   0x3c9ebe0a,0x15c9bebc,0x431d67c4,0x9c100d4c
 438         .long   0x4cc5d4be,0xcb3e42b6,0x597f299c,0xfc657e2a
 439         .long   0x5fcb6fab,0x3ad6faec,0x6c44198c,0x4a475817
 440 ___
 441 $code.=<<___ if ($SZ==4);
 442         .long   0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
 443         .long   0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
 444         .long   0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
 445         .long   0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
 446         .long   0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
 447         .long   0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
 448         .long   0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
 449         .long   0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
 450         .long   0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
 451         .long   0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
 452         .long   0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
 453         .long   0xd192e819,0xd6990624,0xf40e3585,0x106aa070
 454         .long   0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
 455         .long   0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
 456         .long   0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
 457         .long   0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
 458 ___
 459
 460 $code =~ s/\`([^\`]*)\`/eval $1/gem;
 461 print $code;
 462 close STDOUT;