aarch64: Enable building the aarch64 cipher assembly for windows

* cipher/asm-common-aarch64.h: New.
* cipher/camellia-aarch64.S: Use ELF macro, use x19 instead of x18.
* cipher/chacha20-aarch64.S: Use ELF macro, don't use GOT on windows.
* cipher/cipher-gcm-armv8-aarch64-ce.S: Use ELF macro.
* cipher/rijndael-aarch64.S: Use ELF macro.
* cipher/rijndael-armv8-aarch64-ce.S: Use ELF macro.
* cipher/sha1-armv8-aarch64-ce.S: Use ELF macro.
* cipher/sha256-armv8-aarch64-ce.S: Use ELF macro.
* cipher/twofish-aarch64.S: Use ELF macro.
* configure.ac: Don't require .size and .type in aarch64 assembly check.
--
Don't require .type and .size in configure; we can make
them optional via a preprocessor macro.

This is mostly a mechanical change, wrapping the .type and .size
directives in an ELF() macro, with two actual manual changes:
(when targeting windows):
- Don't load global symbols via a GOT (in chacha20)
- Don't use the x18 register (in camellia); back up and restore x19
  in the prologue/epilogue and use that instead.

x18 is a platform specific register; on linux, it's free to be used
by user code, while it's reserved for platform use on windows and
darwin. Always use x19 instead of x18 for consistency.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 5 insertions, 5 deletions

diff --git a/cipher/cipher-gcm-armv8-aarch64-ce.S b/cipher/cipher-gcm-armv8-aarch64-ce.S
index 0cfaf1cc..b6c4f59d 100644
--- a/cipher/cipher-gcm-armv8-aarch64-ce.S
+++ b/cipher/cipher-gcm-armv8-aarch64-ce.S
@@ -17,7 +17,7 @@
  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <config.h>
+#include "asm-common-aarch64.h"
 
 #if defined(__AARCH64EL__) && \
     defined(HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS) && \
@@ -174,7 +174,7 @@ gcry_gcm_reduction_constant:
  */
 .align 3
 .globl _gcry_ghash_armv8_ce_pmull
-.type  _gcry_ghash_armv8_ce_pmull,%function;
+ELF(.type  _gcry_ghash_armv8_ce_pmull,%function;)
 _gcry_ghash_armv8_ce_pmull:
   /* input:
    *    x0: gcm_key
@@ -360,7 +360,7 @@ _gcry_ghash_armv8_ce_pmull:
 .Ldo_nothing:
   mov x0, #0
   ret
-.size _gcry_ghash_armv8_ce_pmull,.-_gcry_ghash_armv8_ce_pmull;
+ELF(.size _gcry_ghash_armv8_ce_pmull,.-_gcry_ghash_armv8_ce_pmull;)
 
 
 /*
@@ -368,7 +368,7 @@ _gcry_ghash_armv8_ce_pmull:
  */
 .align 3
 .globl _gcry_ghash_setup_armv8_ce_pmull
-.type  _gcry_ghash_setup_armv8_ce_pmull,%function;
+ELF(.type  _gcry_ghash_setup_armv8_ce_pmull,%function;)
 _gcry_ghash_setup_armv8_ce_pmull:
   /* input:
    *	x0: gcm_key
@@ -408,6 +408,6 @@ _gcry_ghash_setup_armv8_ce_pmull:
   st1 {rh5.16b-rh6.16b}, [x1]
 
   ret
-.size _gcry_ghash_setup_armv8_ce_pmull,.-_gcry_ghash_setup_armv8_ce_pmull;
+ELF(.size _gcry_ghash_setup_armv8_ce_pmull,.-_gcry_ghash_setup_armv8_ce_pmull;)
 
 #endif