aarch64: Tidy syscall error check

Move the error branch from the PSEUDO_RET macro to the PSEUDO macro.
This is in line with other architectures, and will enable further improvments.

ChangeLog

@@ -1,5 +1,13 @@
 2014-05-25  Richard Henderson  <rth@twiddle.net>
 
+	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (PSEUDO_RET): Move
+	branch to syscall error ...
+	(PSEUDO): ... here.
+	[NOT_IN_libc] (SYSCALL_ERROR_HANDLER): Rename the label
+	from __local_syscall_error to .Lsyscall_error.
+	[!NOT_IN_libc] (SYSCALL_ERROR_HANDLER): Branch to __syscall_error.
+	(SYSCALL_ERROR): Update label name.
+
 	* sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h (PSEUDO):
 	Do not use DOARGS/UNDOARGS.
 	* sysdeps/unix/sysv/linux/aarch64/sysdep.h (DO_CALL): Likewise.

sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h

@@ -33,6 +33,7 @@
     cfi_startproc;							\
     DO_CALL (syscall_name, args);					\
     cmn x0, 4095;							\
+    b.cs .Lsyscall_error;						\
     PSEUDO_RET;								\
     cfi_endproc;							\
     .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	\
@@ -41,6 +42,7 @@
     bne .Lpseudo_cancel;						\
     DO_CALL (syscall_name, 0);						\
     cmn x0, 4095;							\
+    b.cs .Lsyscall_error;						\
     PSEUDO_RET;								\
   .Lpseudo_cancel:							\
     DOCARGS_##args;	/* save syscall args etc. around CENABLE.  */	\
@@ -58,7 +60,8 @@
     ldr x30, [sp], 16;							\
     cfi_adjust_cfa_offset (-16);					\
     cfi_restore (x30);							\
-    cmn x0, 4095;
+    cmn x0, 4095;							\
+    b.cs .Lsyscall_error;
 
 # define DOCARGS_0							\
 	str x30, [sp, -16]!;						\

sysdeps/unix/sysv/linux/aarch64/sysdep.h

@@ -58,17 +58,15 @@
   .text;								      \
   ENTRY (name);								      \
     DO_CALL (syscall_name, args);					      \
-    cmn x0, #4095;
+    cmn x0, #4095;							      \
+    b.cs .Lsyscall_error;
 
 /* Notice the use of 'RET' instead of 'ret' the assembler is case
    insensitive and eglibc already uses the preprocessor symbol 'ret'
    so we use the upper case 'RET' to force through a ret instruction
    to the assembler */
 # define PSEUDO_RET							      \
-    b.cs 1f;								      \
-    RET;								      \
-    1:                                                                        \
-    b SYSCALL_ERROR
+    RET;
 # undef ret
 # define ret PSEUDO_RET
 
@@ -112,10 +110,10 @@
 # define ret_ERRVAL PSEUDO_RET_NOERRNO
 
 # if NOT_IN_libc
-#  define SYSCALL_ERROR __local_syscall_error
+#  define SYSCALL_ERROR  .Lsyscall_error
 #  if RTLD_PRIVATE_ERRNO
 #   define SYSCALL_ERROR_HANDLER				\
-__local_syscall_error:						\
+.Lsyscall_error:						\
 	adrp	x1, C_SYMBOL_NAME(rtld_errno);			\
 	neg     w0, w0;						\
 	str     w0, [x1, :lo12:C_SYMBOL_NAME(rtld_errno)];	\
@@ -124,7 +122,7 @@ __local_syscall_error:						\
 #  else
 
 #   define SYSCALL_ERROR_HANDLER				\
-__local_syscall_error:						\
+.Lsyscall_error:						\
 	stp     x29, x30, [sp, -32]!;				\
 	cfi_adjust_cfa_offset (32);				\
 	cfi_rel_offset (x29, 0);				\
@@ -143,8 +141,10 @@ __local_syscall_error:						\
 	RET;
 #  endif
 # else
-#  define SYSCALL_ERROR_HANDLER	/* Nothing here; code in sysdep.S is used.  */
 #  define SYSCALL_ERROR __syscall_error
+#  define SYSCALL_ERROR_HANDLER                                 \
+.Lsyscall_error:                                                \
+	b	__syscall_error;
 # endif
 
 /* Linux takes system call args in registers: