aarch64: Use tpidr_el0 rather than __errno_location in librt

ChangeLog

@@ -1,7 +1,13 @@
 2014-05-29  Richard Henderson  <rth@twiddle.net>
 
+	* sysdeps/unix/sysv/linux/aarch64/sysdep.h [NOT_IN_libc]
+	(SYSCALL_ERROR_HANDLER): Use tpidr_el0 instead of a call
+	to __errno_location.
+	* sysdeps/unix/sysv/linux/aarch64/nptl/localplt.data (libpthread.so):
+	Remove the expected plt for __errno_location.
+
 	* sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h
-	[!NOT_IN_libc] (SINGLE_THREAD_P): Use tpidr_el0 instead of a
+	[NOT_IN_libc] (SINGLE_THREAD_P): Use tpidr_el0 instead of a
 	call to __read_tp.
 
 	* sysdeps/unix/sysv/linux/aarch64/nptl/sysdep-cancel.h (PSEUDO):

sysdeps/unix/sysv/linux/aarch64/nptl/localplt.data

@@ -12,4 +12,3 @@ libm.so: matherr
 libm.so: __signbit
 libm.so: __signbitf
 libm.so: __signbitl
-libpthread.so: __errno_location

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

@@ -123,21 +123,12 @@
 
 #   define SYSCALL_ERROR_HANDLER				\
 .Lsyscall_error:						\
-	stp     x29, x30, [sp, -32]!;				\
-	cfi_adjust_cfa_offset (32);				\
-	cfi_rel_offset (x29, 0);				\
-	cfi_rel_offset (x30, 8);				\
-        add     x29, sp, 0;					\
-        str     x19, [sp,16];					\
-	neg	x19, x0;					\
-	bl	C_SYMBOL_NAME(__errno_location);		\
-	str	w19, [x0];					\
+	adrp	x1, :gottprel:errno;				\
+	neg	w2, w0;						\
+	ldr	x1, [x1, :gottprel_lo12:errno];			\
+	mrs	x3, tpidr_el0;					\
 	mov	x0, -1;						\
-        ldr     x19, [sp,16];					\
-        ldp     x29, x30, [sp], 32;				\
-	cfi_adjust_cfa_offset (-32);				\
-	cfi_restore (x29);					\
-	cfi_restore (x30);					\
+	str	w2, [x1, x3];					\
 	RET;
 #  endif
 # else