diff options
Diffstat (limited to 'x86')
| -rw-r--r-- | x86/sha1-compress.asm | 273 |
1 files changed, 163 insertions, 110 deletions
diff --git a/x86/sha1-compress.asm b/x86/sha1-compress.asm index 259ff5c3..aab7de46 100644 --- a/x86/sha1-compress.asm +++ b/x86/sha1-compress.asm @@ -24,20 +24,20 @@ define(<SC>,<%ecx>) define(<SD>,<%edx>) define(<SE>,<%ebp>) define(<DATA>,<%esp>) -define(<TMP>,<%edi>) -define(<TMP2>,<%esi>) C Used by SWAP +define(<T1>,<%edi>) +define(<T2>,<%esi>) C Used by SWAP define(<KVALUE>,<%esi>) C Used by rounds C Constants -define(<K1VALUE>, <<$>0x5A827999>) C Rounds 0-19 -define(<K2VALUE>, <<$>0x6ED9EBA1>) C Rounds 20-39 +define(<K1VALUE>, <0x5A827999>) C Rounds 0-19 +define(<K2VALUE>, <0x6ED9EBA1>) C Rounds 20-39 define(<K3VALUE>, <<$>0x8F1BBCDC>) C Rounds 40-59 define(<K4VALUE>, <<$>0xCA62C1D6>) C Rounds 60-79 -C Reads the input via TMP2 into register, byteswaps it, and stores it in the DATA array. +C Reads the input via T2 into register, byteswaps it, and stores it in the DATA array. C SWAP(index, register) define(<SWAP>, < - movl OFFSET($1)(TMP2), $2 + movl OFFSET($1)(T2), $2 bswap $2 movl $2, OFFSET($1) (DATA) >)dnl @@ -48,15 +48,15 @@ C W[i] = (W[i - 16] ^ W[i - 14] ^ W[i - 8] ^ W[i - 3]) <<< 1 C C where W[i] is stored in DATA[i mod 16]. C -C Result is stored back in W[i], and also left in TMP, the only +C Result is stored back in W[i], and also left in T1, the only C register that is used. define(<EXPAND>, < - movl OFFSET(eval($1 % 16)) (DATA), TMP - xorl OFFSET(eval(($1 + 2) % 16)) (DATA), TMP - xorl OFFSET(eval(($1 + 8) % 16)) (DATA), TMP - xorl OFFSET(eval(($1 + 13) % 16)) (DATA), TMP - roll <$>1, TMP - movl TMP, OFFSET(eval($1 % 16)) (DATA)>)dnl + movl OFFSET(eval($1 % 16)) (DATA), T1 + xorl OFFSET(eval(($1 + 2) % 16)) (DATA), T1 + xorl OFFSET(eval(($1 + 8) % 16)) (DATA), T1 + xorl OFFSET(eval(($1 + 13) % 16)) (DATA), T1 + roll <$>1, T1 + movl T1, OFFSET(eval($1 % 16)) (DATA)>)dnl define(<NOEXPAND>, <OFFSET($1) (DATA)>)dnl C The f functions, @@ -67,16 +67,17 @@ C f3(x,y,z) = (x & y) | (z & (x | y)) C f4 = f2 C C The macro Fk(x,y,z) computes = fk(x,y,z). -C Result is left in TMP. +C Result is left in T1. define(<F1>, < - movl $3, TMP - xorl $2, TMP - andl $1, TMP - xorl $3, TMP>)dnl + movl $3, T1 + xorl $2, T1 + andl $1, T1 + xorl $3, T1>)dnl + define(<F2>, < - movl $1, TMP - xorl $2, TMP - xorl $3, TMP>)dnl + movl $1, T1 + xorl $2, T1 + xorl $3, T1>)dnl C The form of one sha1 round is C @@ -95,20 +96,72 @@ C C ROUND(a,b,c,d,e,f,w) define(<ROUND>, < addl KVALUE, $5 - addl ifelse($7,,TMP,$7), $5 + addl ifelse($7,,T1,$7), $5 $6($2,$3,$4) - addl TMP, $5 + addl T1, $5 -C Using the TMP register can be avoided, by rotating $1 in place, +C Using the T1 register can be avoided, by rotating $1 in place, C adding, and then rotating back. - movl $1, TMP - roll <$>5, TMP - addl TMP, $5 + movl $1, T1 + roll <$>5, T1 + addl T1, $5 C roll <$>5, $1 C addl $1, $5 C rorl <$>5, $1 roll <$>30, $2>)dnl +dnl ROUND_F1(a, b, c, d, e, i) +define(<ROUND_F1>, < + mov OFFSET(eval($6 % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 2) % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 8) % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 13) % 16)) (DATA), T1 + rol <$>1, T1 + mov T1, OFFSET(eval($6 % 16)) (DATA) + mov $4, T2 + xor $3, T2 + and $2, T2 + xor $4, T2 + lea K1VALUE (T1, T2), T2 + rol <$>30, $2 + mov $1, T1 + rol <$>5, T1 + add T1, $5 + add T2, $5 +>) + +define(<ROUND_F1_NOEXP>, < + mov $4, T2 + xor $3, T2 + and $2, T2 + xor $4, T2 + add OFFSET(eval($6 % 16)) (DATA), T2 + rol <$>30, $2 + mov $1, T1 + rol <$>5, T1 + lea K1VALUE (T1, $5), $5 + add T2, $5 +>) + +dnl ROUND_F2(a, b, c, d, e, i) +define(<ROUND_F2>, < + mov OFFSET(eval($6 % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 2) % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 8) % 16)) (DATA), T1 + xor OFFSET(eval(($6 + 13) % 16)) (DATA), T1 + rol <$>1, T1 + mov T1, OFFSET(eval($6 % 16)) (DATA) + mov $4, T2 + xor $3, T2 + xor $2, T2 + lea K2VALUE (T1, T2), T2 + rol <$>30, $2 + mov $1, T1 + rol <$>5, T1 + add T1, $5 + add T2, $5 +>) + C As suggested by George Spelvin, write the F3 function as C (x&y) | (y&z) | (x&z) == (x & (y^z)) + (y&z). Then, we can compute C and add each term to e, using a single temporary. @@ -116,21 +169,21 @@ C and add each term to e, using a single temporary. C ROUND_F3(a,b,c,d,e,w) define(<ROUND_F3>, < addl KVALUE, $5 - addl TMP, $5 + addl T1, $5 - movl $3, TMP - andl $4, TMP - addl TMP, $5 - movl $3, TMP - xorl $4, TMP - andl $2, TMP - addl TMP, $5 + movl $3, T1 + andl $4, T1 + addl T1, $5 + movl $3, T1 + xorl $4, T1 + andl $2, T1 + addl T1, $5 -C Using the TMP register can be avoided, by rotating $1 in place, +C Using the T1 register can be avoided, by rotating $1 in place, C adding, and then rotating back. - movl $1, TMP - roll <$>5, TMP - addl TMP, $5 + movl $1, T1 + roll <$>5, T1 + addl T1, $5 C roll <$>5, $1 C addl $1, $5 C rorl <$>5, $1 @@ -157,7 +210,7 @@ PROLOGUE(_nettle_sha1_compress) subl $64, %esp C %esp = W C Load and byteswap data - movl 88(%esp), TMP2 + movl 88(%esp), T2 SWAP( 0, %eax) SWAP( 1, %ebx) SWAP( 2, %ecx) SWAP( 3, %edx) SWAP( 4, %eax) SWAP( 5, %ebx) SWAP( 6, %ecx) SWAP( 7, %edx) @@ -165,14 +218,14 @@ PROLOGUE(_nettle_sha1_compress) SWAP(12, %eax) SWAP(13, %ebx) SWAP(14, %ecx) SWAP(15, %edx) C load the state vector - movl 84(%esp),TMP - movl (TMP), SA - movl 4(TMP), SB - movl 8(TMP), SC - movl 12(TMP), SD - movl 16(TMP), SE - - movl K1VALUE, KVALUE + movl 84(%esp),T1 + movl (T1), SA + movl 4(T1), SB + movl 8(T1), SC + movl 12(T1), SD + movl 16(T1), SE + + movl $ K1VALUE, KVALUE ROUND(SA, SB, SC, SD, SE, <F1>, NOEXPAND( 0)) ROUND(SE, SA, SB, SC, SD, <F1>, NOEXPAND( 1)) ROUND(SD, SE, SA, SB, SC, <F1>, NOEXPAND( 2)) @@ -197,31 +250,31 @@ PROLOGUE(_nettle_sha1_compress) EXPAND(18) ROUND(SC, SD, SE, SA, SB, <F1>) EXPAND(19) ROUND(SB, SC, SD, SE, SA, <F1>) - C TMP2 is free to use in these rounds - movl K2VALUE, KVALUE - EXPAND(20) ROUND(SA, SB, SC, SD, SE, <F2>) - EXPAND(21) ROUND(SE, SA, SB, SC, SD, <F2>) - EXPAND(22) ROUND(SD, SE, SA, SB, SC, <F2>) - EXPAND(23) ROUND(SC, SD, SE, SA, SB, <F2>) - EXPAND(24) ROUND(SB, SC, SD, SE, SA, <F2>) - - EXPAND(25) ROUND(SA, SB, SC, SD, SE, <F2>) - EXPAND(26) ROUND(SE, SA, SB, SC, SD, <F2>) - EXPAND(27) ROUND(SD, SE, SA, SB, SC, <F2>) - EXPAND(28) ROUND(SC, SD, SE, SA, SB, <F2>) - EXPAND(29) ROUND(SB, SC, SD, SE, SA, <F2>) - - EXPAND(30) ROUND(SA, SB, SC, SD, SE, <F2>) - EXPAND(31) ROUND(SE, SA, SB, SC, SD, <F2>) - EXPAND(32) ROUND(SD, SE, SA, SB, SC, <F2>) - EXPAND(33) ROUND(SC, SD, SE, SA, SB, <F2>) - EXPAND(34) ROUND(SB, SC, SD, SE, SA, <F2>) - - EXPAND(35) ROUND(SA, SB, SC, SD, SE, <F2>) - EXPAND(36) ROUND(SE, SA, SB, SC, SD, <F2>) - EXPAND(37) ROUND(SD, SE, SA, SB, SC, <F2>) - EXPAND(38) ROUND(SC, SD, SE, SA, SB, <F2>) - EXPAND(39) ROUND(SB, SC, SD, SE, SA, <F2>) + C T2 is free to use in these rounds + C movl K2VALUE, KVALUE + ROUND_F2(SA, SB, SC, SD, SE, 20) + ROUND_F2(SE, SA, SB, SC, SD, 21) + ROUND_F2(SD, SE, SA, SB, SC, 22) + ROUND_F2(SC, SD, SE, SA, SB, 23) + ROUND_F2(SB, SC, SD, SE, SA, 24) + + ROUND_F2(SA, SB, SC, SD, SE, 25) + ROUND_F2(SE, SA, SB, SC, SD, 26) + ROUND_F2(SD, SE, SA, SB, SC, 27) + ROUND_F2(SC, SD, SE, SA, SB, 28) + ROUND_F2(SB, SC, SD, SE, SA, 29) + + ROUND_F2(SA, SB, SC, SD, SE, 30) + ROUND_F2(SE, SA, SB, SC, SD, 31) + ROUND_F2(SD, SE, SA, SB, SC, 32) + ROUND_F2(SC, SD, SE, SA, SB, 33) + ROUND_F2(SB, SC, SD, SE, SA, 34) + + ROUND_F2(SA, SB, SC, SD, SE, 35) + ROUND_F2(SE, SA, SB, SC, SD, 36) + ROUND_F2(SD, SE, SA, SB, SC, 37) + ROUND_F2(SC, SD, SE, SA, SB, 38) + ROUND_F2(SB, SC, SD, SE, SA, 39) C We have to put this constant on the stack movl K3VALUE, KVALUE @@ -275,12 +328,12 @@ PROLOGUE(_nettle_sha1_compress) EXPAND(79) ROUND(SB, SC, SD, SE, SA, <F2>) C Update the state vector - movl 84(%esp),TMP - addl SA, (TMP) - addl SB, 4(TMP) - addl SC, 8(TMP) - addl SD, 12(TMP) - addl SE, 16(TMP) + movl 84(%esp),T1 + addl SA, (T1) + addl SB, 4(T1) + addl SC, 8(T1) + addl SD, 12(T1) + addl SE, 16(T1) addl $64, %esp popl %edi @@ -296,21 +349,21 @@ C for loosen up dependencies and to more operations in parallel. For C example, take the rounds involving f2, the simplest round function. C Currently, we have C -C movl 16(%esp), TMP -C xorl 24(%esp), TMP -C xorl 48(%esp), TMP -C xorl 4(%esp), TMP -C roll $1, TMP -C movl TMP, 16(%esp) +C movl 16(%esp), T1 +C xorl 24(%esp), T1 +C xorl 48(%esp), T1 +C xorl 4(%esp), T1 +C roll $1, T1 +C movl T1, 16(%esp) C addl KVALUE, SE C 0 -C addl TMP, SE C 1 -C movl SB, TMP C 0 -C xorl SC, TMP C 1 -C xorl SD, TMP C 2 -C addl TMP, SE C 3 -C movl SA, TMP C 0 -C roll $5, TMP C 1 -C addl TMP, SE C 4 +C addl T1, SE C 1 +C movl SB, T1 C 0 +C xorl SC, T1 C 1 +C xorl SD, T1 C 2 +C addl T1, SE C 3 +C movl SA, T1 C 0 +C roll $5, T1 C 1 +C addl T1, SE C 4 C roll $30, SB C 0 C These 16 instructions could be executed in 5.33 cycles if there were @@ -322,30 +375,30 @@ C It would be preferable to accumulate the terms in two or more C registers, to make dependencies shallower. Something like C ...expand, put data in W -C movl SD, TMP C 0 +C movl SD, T1 C 0 C leal K1VALUE(SE, W), SE C 0 -C movl SA, TMP2 C 0 -C xorl SC, TMP C 1 -C roll $5, TMP2 C 1 -C xorl SB, TMP C 2 -C addl TMP2, TMP C 3 -C addl TMP, SE C 4 +C movl SA, T2 C 0 +C xorl SC, T1 C 1 +C roll $5, T2 C 1 +C xorl SB, T1 C 2 +C addl T2, T1 C 3 +C addl T1, SE C 4 C a + b + c + d + e = ((((a + b) + c) + d) + e), latency 4 C a + b + c + d + e = ((a + b) + c) + (d + e) C the out-of-order execution. Next iteration C C ...expand... -C roll $1, TMP C 4 -C movl TMP, 16(%esp) C 5 +C roll $1, T1 C 4 +C movl T1, 16(%esp) C 5 C addl KVALUE, SD C 0 -C addl TMP, SD C 5 -C movl SA, TMP C 0 -C xorl SB, TMP C 1 -C xorl SC, TMP C 2 -C addl TMP, SD C 6 -C movl SE, TMP C 8 -C roll $5, TMP C 9 -C addl TMP, SD C 7 +C addl T1, SD C 5 +C movl SA, T1 C 0 +C xorl SB, T1 C 1 +C xorl SC, T1 C 2 +C addl T1, SD C 6 +C movl SE, T1 C 8 +C roll $5, T1 C 9 +C addl T1, SD C 7 C roll $30, SA C 0 C C Lets look at the latency. Next iteration will operate on (E, A, B, C, D), so we have recurrencies: |