Add m68k-helpers optimized for m680x0

ChangeLog.m68k

@@ -1,3 +1,10 @@
+2010-03-12  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* sysdeps/unix/sysv/linux/m68k/m68k-helpers.S: Renamed ...
+	* sysdeps/unix/sysv/linux/m68k/coldfire/m68k-helpers.S: ... to
+	this.
+	* sysdeps/unix/sysv/linux/m68k/m680x0/m68k-helpers.S: New file.
+
 2010-03-09  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	NPTL support for m68k/ColdFire

sysdeps/unix/sysv/linux/m68k/m680x0/m68k-helpers.S

@@ -0,0 +1,103 @@
+/* Copyright (C) 2010 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <bits/m68k-vdso.h>
+
+	.text
+
+	.hidden __vdso_read_tp_stub
+ENTRY (__vdso_read_tp_stub)
+	cfi_startproc
+	move.l	#__NR_get_thread_area, %d0
+	trap	#0
+	move.l	%d0, %a0
+	rts
+	cfi_endproc
+END (__vdso_read_tp_stub)
+
+# ifdef SHARED
+/* GCC will emit calls to this routine.  Linux has an
+   equivalent helper function (which clobbers fewer registers than
+   a normal function call) in a vdso; tail call to the
+   helper.  */
+# ifdef IS_IN_rtld
+/* rtld gets a hidden copy of __m68k_read_tp.  */
+	.hidden __m68k_read_tp
+# endif
+ENTRY (__m68k_read_tp)
+	cfi_startproc
+	lea	_GLOBAL_OFFSET_TABLE_@GOTPC(%pc), %a0
+	move.l	M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0
+	jmp	([%a0])
+	cfi_endproc
+END (__m68k_read_tp)
+
+/* The following two stubs are for macros in atomic.h, they can't
+   clobber anything.  */
+
+	.hidden __vdso_atomic_cmpxchg_32_stub
+ENTRY (__vdso_atomic_cmpxchg_32_stub)
+	cfi_startproc
+	move.l	%d2, -(%sp)
+	cfi_adjust_cfa_offset (4)
+	cfi_rel_offset (%d2, 0)
+	move.l	%d0, %d2
+	move.l	#SYS_ify (atomic_cmpxchg_32), %d0
+	trap	#0
+	move.l	(%sp)+, %d2
+	cfi_adjust_cfa_offset (-4)
+	cfi_restore (%d2)
+	rts
+	cfi_endproc
+END (__vdso_atomic_cmpxchg_32_stub)
+
+	.hidden __vdso_atomic_barrier_stub
+ENTRY (__vdso_atomic_barrier_stub)
+	cfi_startproc
+	move.l	%d0, -(%sp)
+	cfi_adjust_cfa_offset (4)
+	move.l	#SYS_ify (atomic_barrier), %d0
+	trap	#0
+	move.l	(%sp)+, %d0
+	cfi_adjust_cfa_offset (-4)
+	rts
+	cfi_endproc
+END (__vdso_atomic_barrier_stub)
+# else /* !SHARED */
+/* If the vDSO is not available, use a syscall to get TP.  */
+	strong_alias (__vdso_read_tp_stub, __m68k_read_tp)
+# endif /* SHARED */