ARMv8 assembly pack: add OPENSSL_cleanse.

[openssl.git] / crypto / arm64cpuid.pl

diff --git a/crypto/arm64cpuid.pl b/crypto/arm64cpuid.pl
index b9501ebea8aea2258cac51595723d21aed1a3971..c0af608142b972144283c1c2270ca23f057a714f 100755 (executable)
--- a/crypto/arm64cpuid.pl
+++ b/crypto/arm64cpuid.pl
@@ -69,6 +69,37 @@ _armv8_pmull_probe:
        pmull   v0.1q, v0.1d, v0.1d
        ret
 .size  _armv8_pmull_probe,.-_armv8_pmull_probe
+
+.globl OPENSSL_cleanse
+.type  OPENSSL_cleanse,%function
+.align 5
+OPENSSL_cleanse:
+       cbz     x1,.Lret        // len==0?
+       cmp     x1,#15
+       b.hi    .Lot            // len>15
+       nop
+.Little:
+       strb    wzr,[x0],#1     // store byte-by-byte
+       subs    x1,x1,#1
+       b.ne    .Little
+.Lret: ret
+
+.align 4
+.Lot:  tst     x0,#7
+       b.eq    .Laligned       // inp is aligned
+       strb    wzr,[x0],#1     // store byte-by-byte
+       sub     x1,x1,#1
+       b       .Lot
+
+.align 4
+.Laligned:
+       str     xzr,[x0],#8     // store word-by-word
+       sub     x1,x1,#8
+       tst     x1,#-8
+       b.ne    .Laligned       // len>=8
+       cbnz    x1,.Little      // len!=0?
+       ret
+.size  OPENSSL_cleanse,.-OPENSSL_cleanse
 ___
 
 print $code;