[PATCH 09/11] salsa20-amd64: clear vectors registers

[Jussi Kivilinna]

* cipher/salsa20-amd64.S (CLEAR_REG): New.
(_gcry_salsa20_amd64_encrypt_blocks): Clear vectors registers
at exit.
--

Signed-off-by: Jussi Kivilinna <jussi.kivili...@iki.fi>
---
 cipher/salsa20-amd64.S | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/cipher/salsa20-amd64.S b/cipher/salsa20-amd64.S
index 6efb75e0..ce1495c4 100644
--- a/cipher/salsa20-amd64.S
+++ b/cipher/salsa20-amd64.S
@@ -30,6 +30,8 @@
 
 #include "asm-common-amd64.h"
 
+#define CLEAR_REG(v) pxor v, v
+
 .text
 
 .align 16
@@ -926,6 +928,22 @@ _gcry_salsa20_amd64_encrypt_blocks:
        CFI_DEF_CFA_REGISTER(%rsp)
        pop %rbx
        CFI_POP(%rbx)
+       CLEAR_REG(%xmm0);
+       CLEAR_REG(%xmm1);
+       CLEAR_REG(%xmm2);
+       CLEAR_REG(%xmm3);
+       CLEAR_REG(%xmm4);
+       CLEAR_REG(%xmm5);
+       CLEAR_REG(%xmm6);
+       CLEAR_REG(%xmm7);
+       CLEAR_REG(%xmm8);
+       CLEAR_REG(%xmm9);
+       CLEAR_REG(%xmm10);
+       CLEAR_REG(%xmm11);
+       CLEAR_REG(%xmm12);
+       CLEAR_REG(%xmm13);
+       CLEAR_REG(%xmm14);
+       CLEAR_REG(%xmm15);
        ret_spec_stop
        CFI_RESTORE_STATE();
 .L_bytes_are_128_or_192:
-- 
2.45.2


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