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openssl/crypto/bn/asm/mips3-mont.pl

+#!/usr/bin/env perl
+#
+# ====================================================================
+# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
+# project. The module is, however, dual licensed under OpenSSL and
+# CRYPTOGAMS licenses depending on where you obtain it. For further
+# details see http://www.openssl.org/~appro/cryptogams/.
+# ====================================================================
+
+# This module doesn't present direct interest for OpenSSL, because it
+# doesn't provide better performance for longer keys. While 512-bit
+# RSA private key operations are 40% faster, 1024-bit ones are hardly
+# faster at all, while longer key operations are slower by up to 20%.
+# It might be of interest to embedded system developers though, as
+# it's smaller than 1KB, yet offers ~3x improvement over compiler
+# generated code.
+#
+# The module targets N32 and N64 MIPS ABIs and currently is a bit
+# IRIX-centric, i.e. is likely to require adaptation for other OSes.
+
+# int bn_mul_mont(
+$rp="a0";       # BN_ULONG *rp,
+$ap="a1";       # const BN_ULONG *ap,
+$bp="a2";       # const BN_ULONG *bp,
+$np="a3";       # const BN_ULONG *np,
+$n0="a4";       # const BN_ULONG *n0,
+$num="a5";      # int num);
+
+$lo0="a6";
+$hi0="a7";
+$lo1="v0";
+$hi1="v1";
+$aj="t0";
+$bi="t1";
+$nj="t2";
+$tp="t3";
+$alo="s0";
+$ahi="s1";
+$nlo="s2";
+$nhi="s3";
+$tj="s4";
+$i="s5";
+$j="s6";
+$fp="t8";
+$m1="t9";
+
+$FRAME=8*(2+8);
+
+$code=<<___;
+#include <asm.h>
+#include <regdef.h>
+
+.text
+
+.set    noat
+.set    reorder
+
+.align  5
+.globl  bn_mul_mont
+.ent    bn_mul_mont
+bn_mul_mont:
+        .set    noreorder
+        PTR_SUB sp,64
+        move    $fp,sp
+        .frame  $fp,64,ra
+        slt     AT,$num,4
+        li      v0,0
+        beqzl   AT,.Lproceed
+        nop
+        jr      ra
+        PTR_ADD sp,$fp,64
+        .set    reorder
+.align  5
+.Lproceed:
+        ld      $n0,0($n0)
+        ld      $bi,0($bp)      # bp[0]
+        ld      $aj,0($ap)      # ap[0]
+        ld      $nj,0($np)      # np[0]
+        PTR_SUB sp,16           # place for two extra words
+        sll     $num,3
+        li      AT,-4096
+        PTR_SUB sp,$num
+        and     sp,AT
+
+        sd      s0,0($fp)
+        sd      s1,8($fp)
+        sd      s2,16($fp)
+        sd      s3,24($fp)
+        sd      s4,32($fp)
+        sd      s5,40($fp)
+        sd      s6,48($fp)
+        sd      s7,56($fp)
+
+        dmultu  $aj,$bi
+        ld      $alo,8($ap)
+        ld      $nlo,8($np)
+        mflo    $lo0
+        mfhi    $hi0
+        dmultu  $lo0,$n0
+        mflo    $m1
+
+        dmultu  $alo,$bi
+        mflo    $alo
+        mfhi    $ahi
+
+        dmultu  $nj,$m1
+        mflo    $lo1
+        mfhi    $hi1
+        dmultu  $nlo,$m1
+        daddu   $lo1,$lo0
+        sltu    AT,$lo1,$lo0
+        daddu   $hi1,AT
+        mflo    $nlo
+        mfhi    $nhi
+
+        move    $tp,sp
+        li      $j,16
+.align  4
+.L1st:
+        .set    noreorder
+        PTR_ADD $aj,$ap,$j
+        ld      $aj,($aj)
+        PTR_ADD $nj,$np,$j
+        ld      $nj,($nj)
+
+        dmultu  $aj,$bi
+        daddu   $lo0,$alo,$hi0
+        daddu   $lo1,$nlo,$hi1
+        sltu    AT,$lo0,$hi0
+        sltu    s7,$lo1,$hi1
+        daddu   $hi0,$ahi,AT
+        daddu   $hi1,$nhi,s7
+        mflo    $alo
+        mfhi    $ahi
+
+        daddu   $lo1,$lo0
+        sltu    AT,$lo1,$lo0
+        dmultu  $nj,$m1
+        daddu   $hi1,AT
+        addu    $j,8
+        sd      $lo1,($tp)
+        sltu    s7,$j,$num
+        mflo    $nlo
+        mfhi    $nhi
+
+        bnez    s7,.L1st
+        PTR_ADD $tp,8
+        .set    reorder
+
+        daddu   $lo0,$alo,$hi0
+        sltu    AT,$lo0,$hi0
+        daddu   $hi0,$ahi,AT
+
+        daddu   $lo1,$nlo,$hi1
+        sltu    s7,$lo1,$hi1
+        daddu   $hi1,$nhi,s7
+        daddu   $lo1,$lo0
+        sltu    AT,$lo1,$lo0
+        daddu   $hi1,AT
+
+        sd      $lo1,($tp)
+
+        daddu   $hi1,$hi0
+        sltu    AT,$hi1,$hi0
+        sd      $hi1,8($tp)
+        sd      AT,16($tp)
+
+        li      $i,8
+.align  4
+.Louter:
+        PTR_ADD $bi,$bp,$i
+        ld      $bi,($bi)
+        ld      $aj,($ap)
+        ld      $alo,8($ap)
+        ld      $tj,(sp)
+
+        dmultu  $aj,$bi
+        ld      $nj,($np)
+        ld      $nlo,8($np)
+        mflo    $lo0
+        mfhi    $hi0
+        daddu   $lo0,$tj
+        dmultu  $lo0,$n0
+        sltu    AT,$lo0,$tj
+        daddu   $hi0,AT
+        mflo    $m1
+
+        dmultu  $alo,$bi
+        mflo    $alo
+        mfhi    $ahi
+
+        dmultu  $nj,$m1
+        mflo    $lo1
+        mfhi    $hi1
+
+        dmultu  $nlo,$m1
+        daddu   $lo1,$lo0
+        sltu    AT,$lo1,$lo0
+        daddu   $hi1,AT
+        mflo    $nlo
+        mfhi    $nhi
+
+        move    $tp,sp
+        li      $j,16
+        ld      $tj,8($tp)
+.align  4
+.Linner:
+        .set    noreorder
+        PTR_ADD $aj,$ap,$j
+        ld      $aj,($aj)
+        PTR_ADD $nj,$np,$j
+        ld      $nj,($nj)
+
+        dmultu  $aj,$bi
+        daddu   $lo0,$alo,$hi0
+        daddu   $lo1,$nlo,$hi1
+        sltu    AT,$lo0,$hi0
+        sltu    s7,$lo1,$hi1
+        daddu   $hi0,$ahi,AT
+        daddu   $hi1,$nhi,s7
+        mflo    $alo
+        mfhi    $ahi
+
+        daddu   $lo0,$tj
+        addu    $j,8
+        dmultu  $nj,$m1
+        sltu    AT,$lo0,$tj
+        daddu   $lo1,$lo0
+        daddu   $hi0,AT
+        sltu    s7,$lo1,$lo0
+        ld      $tj,16($tp)
+        daddu   $hi1,s7
+        sltu    AT,$j,$num
+        mflo    $nlo
+        mfhi    $nhi
+        sd      $lo1,($tp)
+        bnez    AT,.Linner
+        PTR_ADD $tp,8
+        .set    reorder
+
+        daddu   $lo0,$alo,$hi0
+        sltu    AT,$lo0,$hi0
+        daddu   $hi0,$ahi,AT
+        daddu   $lo0,$tj
+        sltu    s7,$lo0,$tj
+        daddu   $hi0,s7
+
+        ld      $tj,16($tp)
+        daddu   $lo1,$nlo,$hi1
+        sltu    AT,$lo1,$hi1
+        daddu   $hi1,$nhi,AT
+        daddu   $lo1,$lo0
+        sltu    s7,$lo1,$lo0
+        daddu   $hi1,s7
+        sd      $lo1,($tp)
+
+        daddu   $lo1,$hi1,$hi0
+        sltu    $hi1,$lo1,$hi0
+        daddu   $lo1,$tj
+        sltu    AT,$lo1,$tj
+        daddu   $hi1,AT
+        sd      $lo1,8($tp)
+        sd      $hi1,16($tp)
+
+        addu    $i,8
+        sltu    s7,$i,$num
+        bnez    s7,.Louter
+
+        .set    noreorder
+        PTR_ADD $tj,sp,$num     # &tp[num]
+        move    $tp,sp
+        move    $ap,sp
+        li      $hi0,0          # clear borrow bit
+
+.align  4
+.Lsub:  ld      $lo0,($tp)
+        ld      $lo1,($np)
+        PTR_ADD $tp,8
+        PTR_ADD $np,8
+        dsubu   $lo1,$lo0,$lo1  # tp[i]-np[i]
+        sgtu    AT,$lo1,$lo0
+        dsubu   $lo0,$lo1,$hi0
+        sgtu    $hi0,$lo0,$lo1
+        sd      $lo0,($rp)
+        or      $hi0,AT
+        sltu    AT,$tp,$tj
+        bnez    AT,.Lsub
+        PTR_ADD $rp,8
+
+        dsubu   $hi0,$hi1,$hi0  # handle upmost overflow bit
+        move    $tp,sp
+        PTR_SUB $rp,$num        # restore rp
+        not     $hi1,$hi0
+
+        and     $ap,$hi0,sp
+        and     $bp,$hi1,$rp
+        or      $ap,$ap,$bp     # ap=borrow?tp:rp
+
+.align  4
+.Lcopy: ld      $aj,($ap)
+        PTR_ADD $ap,8
+        PTR_ADD $tp,8
+        sd      zero,-8($tp)
+        sltu    AT,$tp,$tj
+        sd      $aj,($rp)
+        bnez    AT,.Lcopy
+        PTR_ADD $rp,8
+
+        ld      s0,0($fp)
+        ld      s1,8($fp)
+        ld      s2,16($fp)
+        ld      s3,24($fp)
+        ld      s4,32($fp)
+        ld      s5,40($fp)
+        ld      s6,48($fp)
+        ld      s7,56($fp)
+        li      v0,1
+        jr      ra
+        PTR_ADD sp,$fp,64
+        .set    reorder
+END(bn_mul_mont)
+.rdata
+.asciiz "Montgomery Multiplication for MIPS III/IV, CRYPTOGAMS by <appro\@openssl.org>"
+___
+
+print $code;
+close STDOUT;