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      1 #!/usr/bin/env perl
      2 #
      3 # ====================================================================
      4 # Written by Andy Polyakov <appro (at] fy.chalmers.se> for the OpenSSL
      5 # project. Rights for redistribution and usage in source and binary
      6 # forms are granted according to the OpenSSL license.
      7 # ====================================================================
      8 #
      9 # sha256/512_block procedure for x86_64.
     10 #
     11 # 40% improvement over compiler-generated code on Opteron. On EM64T
     12 # sha256 was observed to run >80% faster and sha512 - >40%. No magical
     13 # tricks, just straight implementation... I really wonder why gcc
     14 # [being armed with inline assembler] fails to generate as fast code.
     15 # The only thing which is cool about this module is that it's very
     16 # same instruction sequence used for both SHA-256 and SHA-512. In
     17 # former case the instructions operate on 32-bit operands, while in
     18 # latter - on 64-bit ones. All I had to do is to get one flavor right,
     19 # the other one passed the test right away:-)
     20 #
     21 # sha256_block runs in ~1005 cycles on Opteron, which gives you
     22 # asymptotic performance of 64*1000/1005=63.7MBps times CPU clock
     23 # frequency in GHz. sha512_block runs in ~1275 cycles, which results
     24 # in 128*1000/1275=100MBps per GHz. Is there room for improvement?
     25 # Well, if you compare it to IA-64 implementation, which maintains
     26 # X[16] in register bank[!], tends to 4 instructions per CPU clock
     27 # cycle and runs in 1003 cycles, 1275 is very good result for 3-way
     28 # issue Opteron pipeline and X[16] maintained in memory. So that *if*
     29 # there is a way to improve it, *then* the only way would be to try to
     30 # offload X[16] updates to SSE unit, but that would require "deeper"
     31 # loop unroll, which in turn would naturally cause size blow-up, not
     32 # to mention increased complexity! And once again, only *if* it's
     33 # actually possible to noticeably improve overall ILP, instruction
     34 # level parallelism, on a given CPU implementation in this case.
     35 #
     36 # Special note on Intel EM64T. While Opteron CPU exhibits perfect
     37 # perfromance ratio of 1.5 between 64- and 32-bit flavors [see above],
     38 # [currently available] EM64T CPUs apparently are far from it. On the
     39 # contrary, 64-bit version, sha512_block, is ~30% *slower* than 32-bit
     40 # sha256_block:-( This is presumably because 64-bit shifts/rotates
     41 # apparently are not atomic instructions, but implemented in microcode.
     42 
     43 $output=shift;
     44 
     45 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
     46 ( $xlate="${dir}x86_64-xlate.pl" and -f $xlate ) or
     47 ( $xlate="${dir}../../perlasm/x86_64-xlate.pl" and -f $xlate) or
     48 die "can't locate x86_64-xlate.pl";
     49 
     50 open STDOUT,"| $^X $xlate $output";
     51 
     52 if ($output =~ /512/) {
     53 	$func="sha512_block_data_order";
     54 	$TABLE="K512";
     55 	$SZ=8;
     56 	@ROT=($A,$B,$C,$D,$E,$F,$G,$H)=("%rax","%rbx","%rcx","%rdx",
     57 					"%r8", "%r9", "%r10","%r11");
     58 	($T1,$a0,$a1,$a2)=("%r12","%r13","%r14","%r15");
     59 	@Sigma0=(28,34,39);
     60 	@Sigma1=(14,18,41);
     61 	@sigma0=(1,  8, 7);
     62 	@sigma1=(19,61, 6);
     63 	$rounds=80;
     64 } else {
     65 	$func="sha256_block_data_order";
     66 	$TABLE="K256";
     67 	$SZ=4;
     68 	@ROT=($A,$B,$C,$D,$E,$F,$G,$H)=("%eax","%ebx","%ecx","%edx",
     69 					"%r8d","%r9d","%r10d","%r11d");
     70 	($T1,$a0,$a1,$a2)=("%r12d","%r13d","%r14d","%r15d");
     71 	@Sigma0=( 2,13,22);
     72 	@Sigma1=( 6,11,25);
     73 	@sigma0=( 7,18, 3);
     74 	@sigma1=(17,19,10);
     75 	$rounds=64;
     76 }
     77 
     78 $ctx="%rdi";	# 1st arg
     79 $round="%rdi";	# zaps $ctx
     80 $inp="%rsi";	# 2nd arg
     81 $Tbl="%rbp";
     82 
     83 $_ctx="16*$SZ+0*8(%rsp)";
     84 $_inp="16*$SZ+1*8(%rsp)";
     85 $_end="16*$SZ+2*8(%rsp)";
     86 $_rsp="16*$SZ+3*8(%rsp)";
     87 $framesz="16*$SZ+4*8";
     88 
     89 
     90 sub ROUND_00_15()
     91 { my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
     92 
     93 $code.=<<___;
     94 	mov	$e,$a0
     95 	mov	$e,$a1
     96 	mov	$f,$a2
     97 
     98 	ror	\$$Sigma1[0],$a0
     99 	ror	\$$Sigma1[1],$a1
    100 	xor	$g,$a2			# f^g
    101 
    102 	xor	$a1,$a0
    103 	ror	\$`$Sigma1[2]-$Sigma1[1]`,$a1
    104 	and	$e,$a2			# (f^g)&e
    105 	mov	$T1,`$SZ*($i&0xf)`(%rsp)
    106 
    107 	xor	$a1,$a0			# Sigma1(e)
    108 	xor	$g,$a2			# Ch(e,f,g)=((f^g)&e)^g
    109 	add	$h,$T1			# T1+=h
    110 
    111 	mov	$a,$h
    112 	add	$a0,$T1			# T1+=Sigma1(e)
    113 
    114 	add	$a2,$T1			# T1+=Ch(e,f,g)
    115 	mov	$a,$a0
    116 	mov	$a,$a1
    117 
    118 	ror	\$$Sigma0[0],$h
    119 	ror	\$$Sigma0[1],$a0
    120 	mov	$a,$a2
    121 	add	($Tbl,$round,$SZ),$T1	# T1+=K[round]
    122 
    123 	xor	$a0,$h
    124 	ror	\$`$Sigma0[2]-$Sigma0[1]`,$a0
    125 	or	$c,$a1			# a|c
    126 
    127 	xor	$a0,$h			# h=Sigma0(a)
    128 	and	$c,$a2			# a&c
    129 	add	$T1,$d			# d+=T1
    130 
    131 	and	$b,$a1			# (a|c)&b
    132 	add	$T1,$h			# h+=T1
    133 
    134 	or	$a2,$a1			# Maj(a,b,c)=((a|c)&b)|(a&c)
    135 	lea	1($round),$round	# round++
    136 
    137 	add	$a1,$h			# h+=Maj(a,b,c)
    138 ___
    139 }
    140 
    141 sub ROUND_16_XX()
    142 { my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
    143 
    144 $code.=<<___;
    145 	mov	`$SZ*(($i+1)&0xf)`(%rsp),$a0
    146 	mov	`$SZ*(($i+14)&0xf)`(%rsp),$T1
    147 
    148 	mov	$a0,$a2
    149 
    150 	shr	\$$sigma0[2],$a0
    151 	ror	\$$sigma0[0],$a2
    152 
    153 	xor	$a2,$a0
    154 	ror	\$`$sigma0[1]-$sigma0[0]`,$a2
    155 
    156 	xor	$a2,$a0			# sigma0(X[(i+1)&0xf])
    157 	mov	$T1,$a1
    158 
    159 	shr	\$$sigma1[2],$T1
    160 	ror	\$$sigma1[0],$a1
    161 
    162 	xor	$a1,$T1
    163 	ror	\$`$sigma1[1]-$sigma1[0]`,$a1
    164 
    165 	xor	$a1,$T1			# sigma1(X[(i+14)&0xf])
    166 
    167 	add	$a0,$T1
    168 
    169 	add	`$SZ*(($i+9)&0xf)`(%rsp),$T1
    170 
    171 	add	`$SZ*($i&0xf)`(%rsp),$T1
    172 ___
    173 	&ROUND_00_15(@_);
    174 }
    175 
    176 $code=<<___;
    177 .text
    178 
    179 .globl	$func
    180 .type	$func,\@function,4
    181 .align	16
    182 $func:
    183 	push	%rbx
    184 	push	%rbp
    185 	push	%r12
    186 	push	%r13
    187 	push	%r14
    188 	push	%r15
    189 	mov	%rsp,%rbp		# copy %rsp
    190 	shl	\$4,%rdx		# num*16
    191 	sub	\$$framesz,%rsp
    192 	lea	($inp,%rdx,$SZ),%rdx	# inp+num*16*$SZ
    193 	and	\$-64,%rsp		# align stack frame
    194 	mov	$ctx,$_ctx		# save ctx, 1st arg
    195 	mov	$inp,$_inp		# save inp, 2nd arh
    196 	mov	%rdx,$_end		# save end pointer, "3rd" arg
    197 	mov	%rbp,$_rsp		# save copy of %rsp
    198 
    199 	.picmeup $Tbl
    200 	lea	$TABLE-.($Tbl),$Tbl
    201 
    202 	mov	$SZ*0($ctx),$A
    203 	mov	$SZ*1($ctx),$B
    204 	mov	$SZ*2($ctx),$C
    205 	mov	$SZ*3($ctx),$D
    206 	mov	$SZ*4($ctx),$E
    207 	mov	$SZ*5($ctx),$F
    208 	mov	$SZ*6($ctx),$G
    209 	mov	$SZ*7($ctx),$H
    210 	jmp	.Lloop
    211 
    212 .align	16
    213 .Lloop:
    214 	xor	$round,$round
    215 ___
    216 	for($i=0;$i<16;$i++) {
    217 		$code.="	mov	$SZ*$i($inp),$T1\n";
    218 		$code.="	bswap	$T1\n";
    219 		&ROUND_00_15($i,@ROT);
    220 		unshift(@ROT,pop(@ROT));
    221 	}
    222 $code.=<<___;
    223 	jmp	.Lrounds_16_xx
    224 .align	16
    225 .Lrounds_16_xx:
    226 ___
    227 	for(;$i<32;$i++) {
    228 		&ROUND_16_XX($i,@ROT);
    229 		unshift(@ROT,pop(@ROT));
    230 	}
    231 
    232 $code.=<<___;
    233 	cmp	\$$rounds,$round
    234 	jb	.Lrounds_16_xx
    235 
    236 	mov	$_ctx,$ctx
    237 	lea	16*$SZ($inp),$inp
    238 
    239 	add	$SZ*0($ctx),$A
    240 	add	$SZ*1($ctx),$B
    241 	add	$SZ*2($ctx),$C
    242 	add	$SZ*3($ctx),$D
    243 	add	$SZ*4($ctx),$E
    244 	add	$SZ*5($ctx),$F
    245 	add	$SZ*6($ctx),$G
    246 	add	$SZ*7($ctx),$H
    247 
    248 	cmp	$_end,$inp
    249 
    250 	mov	$A,$SZ*0($ctx)
    251 	mov	$B,$SZ*1($ctx)
    252 	mov	$C,$SZ*2($ctx)
    253 	mov	$D,$SZ*3($ctx)
    254 	mov	$E,$SZ*4($ctx)
    255 	mov	$F,$SZ*5($ctx)
    256 	mov	$G,$SZ*6($ctx)
    257 	mov	$H,$SZ*7($ctx)
    258 	jb	.Lloop
    259 
    260 	mov	$_rsp,%rsp
    261 	pop	%r15
    262 	pop	%r14
    263 	pop	%r13
    264 	pop	%r12
    265 	pop	%rbp
    266 	pop	%rbx
    267 
    268 	ret
    269 .size	$func,.-$func
    270 ___
    271 
    272 if ($SZ==4) {
    273 $code.=<<___;
    274 .align	64
    275 .type	$TABLE,\@object
    276 $TABLE:
    277 	.long	0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
    278 	.long	0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
    279 	.long	0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
    280 	.long	0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
    281 	.long	0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
    282 	.long	0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
    283 	.long	0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
    284 	.long	0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
    285 	.long	0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
    286 	.long	0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
    287 	.long	0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
    288 	.long	0xd192e819,0xd6990624,0xf40e3585,0x106aa070
    289 	.long	0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
    290 	.long	0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
    291 	.long	0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
    292 	.long	0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
    293 ___
    294 } else {
    295 $code.=<<___;
    296 .align	64
    297 .type	$TABLE,\@object
    298 $TABLE:
    299 	.quad	0x428a2f98d728ae22,0x7137449123ef65cd
    300 	.quad	0xb5c0fbcfec4d3b2f,0xe9b5dba58189dbbc
    301 	.quad	0x3956c25bf348b538,0x59f111f1b605d019
    302 	.quad	0x923f82a4af194f9b,0xab1c5ed5da6d8118
    303 	.quad	0xd807aa98a3030242,0x12835b0145706fbe
    304 	.quad	0x243185be4ee4b28c,0x550c7dc3d5ffb4e2
    305 	.quad	0x72be5d74f27b896f,0x80deb1fe3b1696b1
    306 	.quad	0x9bdc06a725c71235,0xc19bf174cf692694
    307 	.quad	0xe49b69c19ef14ad2,0xefbe4786384f25e3
    308 	.quad	0x0fc19dc68b8cd5b5,0x240ca1cc77ac9c65
    309 	.quad	0x2de92c6f592b0275,0x4a7484aa6ea6e483
    310 	.quad	0x5cb0a9dcbd41fbd4,0x76f988da831153b5
    311 	.quad	0x983e5152ee66dfab,0xa831c66d2db43210
    312 	.quad	0xb00327c898fb213f,0xbf597fc7beef0ee4
    313 	.quad	0xc6e00bf33da88fc2,0xd5a79147930aa725
    314 	.quad	0x06ca6351e003826f,0x142929670a0e6e70
    315 	.quad	0x27b70a8546d22ffc,0x2e1b21385c26c926
    316 	.quad	0x4d2c6dfc5ac42aed,0x53380d139d95b3df
    317 	.quad	0x650a73548baf63de,0x766a0abb3c77b2a8
    318 	.quad	0x81c2c92e47edaee6,0x92722c851482353b
    319 	.quad	0xa2bfe8a14cf10364,0xa81a664bbc423001
    320 	.quad	0xc24b8b70d0f89791,0xc76c51a30654be30
    321 	.quad	0xd192e819d6ef5218,0xd69906245565a910
    322 	.quad	0xf40e35855771202a,0x106aa07032bbd1b8
    323 	.quad	0x19a4c116b8d2d0c8,0x1e376c085141ab53
    324 	.quad	0x2748774cdf8eeb99,0x34b0bcb5e19b48a8
    325 	.quad	0x391c0cb3c5c95a63,0x4ed8aa4ae3418acb
    326 	.quad	0x5b9cca4f7763e373,0x682e6ff3d6b2b8a3
    327 	.quad	0x748f82ee5defb2fc,0x78a5636f43172f60
    328 	.quad	0x84c87814a1f0ab72,0x8cc702081a6439ec
    329 	.quad	0x90befffa23631e28,0xa4506cebde82bde9
    330 	.quad	0xbef9a3f7b2c67915,0xc67178f2e372532b
    331 	.quad	0xca273eceea26619c,0xd186b8c721c0c207
    332 	.quad	0xeada7dd6cde0eb1e,0xf57d4f7fee6ed178
    333 	.quad	0x06f067aa72176fba,0x0a637dc5a2c898a6
    334 	.quad	0x113f9804bef90dae,0x1b710b35131c471b
    335 	.quad	0x28db77f523047d84,0x32caab7b40c72493
    336 	.quad	0x3c9ebe0a15c9bebc,0x431d67c49c100d4c
    337 	.quad	0x4cc5d4becb3e42b6,0x597f299cfc657e2a
    338 	.quad	0x5fcb6fab3ad6faec,0x6c44198c4a475817
    339 ___
    340 }
    341 
    342 $code =~ s/\`([^\`]*)\`/eval $1/gem;
    343 print $code;
    344 close STDOUT;
    345