Move m68k from ports to libc

sysdeps/m68k/sysdep.h

@@ -0,0 +1,74 @@
+/* Assembler macros for m68k.
+   Copyright (C) 1998-2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdeps/generic/sysdep.h>
+
+#ifdef __ASSEMBLER__
+
+/* Define an entry point visible from C.
+
+   There is currently a bug in gdb which prevents us from specifying
+   incomplete stabs information.  Fake some entries here which specify
+   the current source file.  */
+# define ENTRY(name)							      \
+  .globl C_SYMBOL_NAME(name);						      \
+  .type C_SYMBOL_NAME(name),@function;					      \
+  .p2align 2;								      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+  CALL_MCOUNT
+
+# undef END
+# define END(name)							      \
+  cfi_endproc;								      \
+  .size name,.-name
+
+
+/* If compiled for profiling, call `_mcount' at the start of each function.  */
+# ifdef	PROF
+/* The mcount code relies on a normal frame pointer being on the stack
+   to locate our caller, so push one just for its benefit.  */
+#  define CALL_MCOUNT \
+  move.l %fp, -(%sp);							      \
+  cfi_adjust_cfa_offset (4);  cfi_rel_offset (%a6, 0);			      \
+  move.l %sp, %fp;							      \
+  jbsr JUMPTARGET (_mcount);						      \
+  move.l (%sp)+, %fp;							      \
+  cfi_adjust_cfa_offset (-4); cfi_restore (%a6);
+# else
+#  define CALL_MCOUNT		/* Do nothing.  */
+# endif
+
+# define PSEUDO(name, syscall_name, args)				      \
+  .globl __syscall_error;						      \
+  ENTRY (name)								      \
+    DO_CALL (syscall_name, args);					      \
+    jcc JUMPTARGET(__syscall_error)
+
+# undef PSEUDO_END
+# define PSEUDO_END(name)						      \
+  END (name)
+
+# undef JUMPTARGET
+# ifdef PIC
+#  define JUMPTARGET(name)	name##@PLTPC
+# else
+#  define JUMPTARGET(name)	name
+# endif
+
+#endif	/* __ASSEMBLER__ */