crypto: x86/aes-xts - make non-AVX implementation use new glue code

Make the non-AVX implementation of AES-XTS (xts-aes-aesni) use the new
glue code that was introduced for the AVX implementations of AES-XTS.
This reduces code size, and it improves the performance of xts-aes-aesni
due to the optimization for messages that don't span page boundaries.

This required moving the new glue functions higher up in the file and
allowing the IV encryption function to be specified by the caller.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/aes-xts-avx-x86_64.S

@@ -751,7 +751,7 @@
 
 // void aes_xts_encrypt_iv(const struct crypto_aes_ctx *tweak_key,
 //			   u8 iv[AES_BLOCK_SIZE]);
-SYM_FUNC_START(aes_xts_encrypt_iv)
+SYM_TYPED_FUNC_START(aes_xts_encrypt_iv)
 	vmovdqu		(%rsi), %xmm0
 	vpxor		0*16(%rdi), %xmm0, %xmm0
 	vaesenc		1*16(%rdi), %xmm0, %xmm0

arch/x86/crypto/aesni-intel_asm.S

@@ -2843,10 +2843,10 @@ SYM_FUNC_END(aesni_ctr_enc)
 	pxor KEY, IV;
 
 /*
- * void aesni_xts_encrypt(const struct crypto_aes_ctx *ctx, u8 *dst,
+ * void aesni_xts_enc(const struct crypto_aes_ctx *ctx, u8 *dst,
  *		      const u8 *src, unsigned int len, le128 *iv)
  */
-SYM_FUNC_START(aesni_xts_encrypt)
+SYM_FUNC_START(aesni_xts_enc)
 	FRAME_BEGIN
 #ifndef __x86_64__
 	pushl IVP
@@ -2995,13 +2995,13 @@ SYM_FUNC_START(aesni_xts_encrypt)
 
 	movups STATE, (OUTP)
 	jmp .Lxts_enc_ret
-SYM_FUNC_END(aesni_xts_encrypt)
+SYM_FUNC_END(aesni_xts_enc)
 
 /*
- * void aesni_xts_decrypt(const struct crypto_aes_ctx *ctx, u8 *dst,
+ * void aesni_xts_dec(const struct crypto_aes_ctx *ctx, u8 *dst,
  *		      const u8 *src, unsigned int len, le128 *iv)
  */
-SYM_FUNC_START(aesni_xts_decrypt)
+SYM_FUNC_START(aesni_xts_dec)
 	FRAME_BEGIN
 #ifndef __x86_64__
 	pushl IVP
@@ -3157,4 +3157,4 @@ SYM_FUNC_START(aesni_xts_decrypt)
 
 	movups STATE, (OUTP)
 	jmp .Lxts_dec_ret
-SYM_FUNC_END(aesni_xts_decrypt)
+SYM_FUNC_END(aesni_xts_dec)