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60 lines
1.9 KiB
Diff
60 lines
1.9 KiB
Diff
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From a2c7d387da3b3cdb8b7c16ef91cce45f92ebcf61 Mon Sep 17 00:00:00 2001
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From: Uros Bizjak <ubizjak@gmail.com>
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Date: Thu, 27 Aug 2020 19:38:31 +0200
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Subject: [PATCH 064/124] crypto: poly1305-x86_64 - Use XORL r32,32
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commit 7dfd1e01b3dfc13431b1b25720cf2692a7e111ef upstream.
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x86_64 zero extends 32bit operations, so for 64bit operands,
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XORL r32,r32 is functionally equal to XORQ r64,r64, but avoids
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a REX prefix byte when legacy registers are used.
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Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
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Cc: Herbert Xu <herbert@gondor.apana.org.au>
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Cc: "David S. Miller" <davem@davemloft.net>
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Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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--- a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl
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+++ b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl
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@@ -246,7 +246,7 @@ $code.=<<___ if (!$kernel);
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___
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&declare_function("poly1305_init_x86_64", 32, 3);
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$code.=<<___;
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- xor %rax,%rax
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+ xor %eax,%eax
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mov %rax,0($ctx) # initialize hash value
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mov %rax,8($ctx)
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mov %rax,16($ctx)
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@@ -2869,7 +2869,7 @@ $code.=<<___;
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.type poly1305_init_base2_44,\@function,3
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.align 32
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poly1305_init_base2_44:
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- xor %rax,%rax
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+ xor %eax,%eax
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mov %rax,0($ctx) # initialize hash value
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mov %rax,8($ctx)
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mov %rax,16($ctx)
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@@ -3963,7 +3963,7 @@ xor128_decrypt_n_pad:
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mov \$16,$len
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sub %r10,$len
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xor %eax,%eax
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- xor %r11,%r11
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+ xor %r11d,%r11d
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.Loop_dec_byte:
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mov ($inp,$otp),%r11b
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mov ($otp),%al
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@@ -4101,7 +4101,7 @@ avx_handler:
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.long 0xa548f3fc # cld; rep movsq
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mov $disp,%rsi
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- xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
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+ xor %ecx,%ecx # arg1, UNW_FLAG_NHANDLER
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mov 8(%rsi),%rdx # arg2, disp->ImageBase
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mov 0(%rsi),%r8 # arg3, disp->ControlPc
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mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
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