[PATCH 04/11] sm4-aarch64-ce: clear volatile vector registers

[Jussi Kivilinna]

* cipher/sm4-armv8-aarch64-ce.S (_gcry_sm4_armv8_ce_expand_key)
(_gcry_sm4_armv8_ce_crypt_blk1_8, _gcry_sm4_armv8_ce_crypt)
(_gcry_sm4_armv8_ce_cbc_dec, _gcry_sm4_armv8_ce_cfb_dec)
(_gcry_sm4_armv8_ce_ctr_enc, _gcry_sm4_armv8_ce_xts_crypt): Add
CLEAR_ALL_REGS.
--

Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
---
 cipher/sm4-armv8-aarch64-ce.S | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/cipher/sm4-armv8-aarch64-ce.S b/cipher/sm4-armv8-aarch64-ce.S
index eea56cdf..01f3df92 100644
--- a/cipher/sm4-armv8-aarch64-ce.S
+++ b/cipher/sm4-armv8-aarch64-ce.S
@@ -290,6 +290,7 @@ _gcry_sm4_armv8_ce_expand_key:
     st1 {v1.16b}, [x2], #16;
     st1 {v0.16b}, [x2];
 
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_expand_key,.-_gcry_sm4_armv8_ce_expand_key;)
@@ -383,6 +384,7 @@ _gcry_sm4_armv8_ce_crypt_blk1_8:
     st1 {v7.16b}, [x1];
 
 .Lblk8_store_output_done:
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_crypt_blk1_8,.-_gcry_sm4_armv8_ce_crypt_blk1_8;)
@@ -416,6 +418,7 @@ _gcry_sm4_armv8_ce_crypt:
     b .Lcrypt_loop_blk;
 
 .Lcrypt_end:
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_crypt,.-_gcry_sm4_armv8_ce_crypt;)
@@ -468,6 +471,7 @@ _gcry_sm4_armv8_ce_cbc_dec:
     /* store new IV */
     st1 {RIV.16b}, [x3];
 
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_cbc_dec,.-_gcry_sm4_armv8_ce_cbc_dec;)
@@ -520,6 +524,7 @@ _gcry_sm4_armv8_ce_cfb_dec:
     /* store new IV */
     st1 {v0.16b}, [x3];
 
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_cfb_dec,.-_gcry_sm4_armv8_ce_cfb_dec;)
@@ -588,6 +593,7 @@ _gcry_sm4_armv8_ce_ctr_enc:
     rev x8, x8;
     stp x7, x8, [x3];
 
+    CLEAR_ALL_REGS();
     ret_spec_stop;
     CFI_ENDPROC();
 ELF(.size _gcry_sm4_armv8_ce_ctr_enc,.-_gcry_sm4_armv8_ce_ctr_enc;)
@@ -713,17 +719,8 @@ _gcry_sm4_armv8_ce_xts_crypt:
     /* store new tweak */
     st1         {v8.16b}, [x3]
 
-    CLEAR_REG(v8)
-    CLEAR_REG(v9)
-    CLEAR_REG(v10)
-    CLEAR_REG(v11)
-    CLEAR_REG(v12)
-    CLEAR_REG(v13)
-    CLEAR_REG(v14)
-    CLEAR_REG(v15)
-    CLEAR_REG(RIV)
-
     VPOP_ABI
+    CLEAR_ALL_REGS();
     ret_spec_stop
     CFI_ENDPROC()
 ELF(.size _gcry_sm4_armv8_ce_xts_crypt,.-_gcry_sm4_armv8_ce_xts_crypt;)
-- 
2.45.2