diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0064-crypto-poly1305-x86_64-Use-XORL-r32-32.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/080-wireguard-0064-crypto-poly1305-x86_64-Use-XORL-r32-32.patch | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0064-crypto-poly1305-x86_64-Use-XORL-r32-32.patch b/target/linux/generic/backport-5.4/080-wireguard-0064-crypto-poly1305-x86_64-Use-XORL-r32-32.patch new file mode 100644 index 0000000000..4fcaa1eb75 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0064-crypto-poly1305-x86_64-Use-XORL-r32-32.patch @@ -0,0 +1,59 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Uros Bizjak <ubizjak@gmail.com> +Date: Thu, 27 Aug 2020 19:38:31 +0200 +Subject: [PATCH] crypto: poly1305-x86_64 - Use XORL r32,32 + +commit 7dfd1e01b3dfc13431b1b25720cf2692a7e111ef upstream. + +x86_64 zero extends 32bit operations, so for 64bit operands, +XORL r32,r32 is functionally equal to XORQ r64,r64, but avoids +a REX prefix byte when legacy registers are used. + +Signed-off-by: Uros Bizjak <ubizjak@gmail.com> +Cc: Herbert Xu <herbert@gondor.apana.org.au> +Cc: "David S. Miller" <davem@davemloft.net> +Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +--- a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl ++++ b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl +@@ -246,7 +246,7 @@ $code.=<<___ if (!$kernel); + ___ + &declare_function("poly1305_init_x86_64", 32, 3); + $code.=<<___; +- xor %rax,%rax ++ xor %eax,%eax + mov %rax,0($ctx) # initialize hash value + mov %rax,8($ctx) + mov %rax,16($ctx) +@@ -2869,7 +2869,7 @@ $code.=<<___; + .type poly1305_init_base2_44,\@function,3 + .align 32 + poly1305_init_base2_44: +- xor %rax,%rax ++ xor %eax,%eax + mov %rax,0($ctx) # initialize hash value + mov %rax,8($ctx) + mov %rax,16($ctx) +@@ -3963,7 +3963,7 @@ xor128_decrypt_n_pad: + mov \$16,$len + sub %r10,$len + xor %eax,%eax +- xor %r11,%r11 ++ xor %r11d,%r11d + .Loop_dec_byte: + mov ($inp,$otp),%r11b + mov ($otp),%al +@@ -4101,7 +4101,7 @@ avx_handler: + .long 0xa548f3fc # cld; rep movsq + + mov $disp,%rsi +- xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER ++ xor %ecx,%ecx # arg1, UNW_FLAG_NHANDLER + mov 8(%rsi),%rdx # arg2, disp->ImageBase + mov 0(%rsi),%r8 # arg3, disp->ControlPc + mov 16(%rsi),%r9 # arg4, disp->FunctionEntry |