nptl: sysdep headers re-factoring

This patch will re-factor and simplify sysdep headers
handling for nptl branch.
The reason is to use some useful macros in asm code (i.e. ENTRY()) that are available
only into nptl branch because are defined in sysdep.h header under the nptl folder
even if they are not related to NPTL at all (this was likely due to a bad choice done
at the early stage of NPTL porting).
This is a required steps for integrating into master branch some asm code available in
nptl branch for sh4.

The main changes are described below:

nptl/sysdeps/generic/sysdep.h (moved) ---> libc/sysdeps/linux/common/sysdep.h
nptl/sysdeps/arm/sysdep.h     (moved) ---> libc/sysdeps/linux/arm/sysdep.h

nptl/sysdeps/sh/sysdep.h ---------------------|
nptl/sysdeps/unix/sh/sysdep.h ----------------|
nptl/sysdeps/unix/sysv/linux/sh/sysdep.h -----|
nptl/sysdeps/unix/sysv/linux/sh/sh4/sysdep.h -|
                                              |(merged) ---> libc/sysdeps/linux/sh

nptl/sysdeps/unix/sysdep.h (deleted)

Similarly the mips and arm sysdep.h should be merged and updated as for sh arch.

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

Rules.mak

@@ -548,6 +548,7 @@ NOSTDLIB_CFLAGS:=$(call check_gcc,-nostdlib,)
 CFLAGS := -include $(top_srcdir)include/libc-symbols.h \
 	$(XWARNINGS) $(CPU_CFLAGS) $(SSP_CFLAGS) \
 	-nostdinc -I$(top_builddir)include -I$(top_srcdir)include -I. \
+	-I$(top_srcdir)libc/sysdeps/linux \
 	-I$(top_srcdir)libc/sysdeps/linux/$(TARGET_ARCH)
 ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
 CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
@@ -637,7 +638,6 @@ PTINC:=	-I$(top_srcdir)$(PTDIR)						\
 	-I$(top_srcdir)$(PTDIR)/sysdeps/unix/sysv/linux			\
 	-I$(top_srcdir)$(PTDIR)/sysdeps/pthread				\
 	-I$(top_srcdir)$(PTDIR)/sysdeps/pthread/bits				\
-	-I$(top_srcdir)$(PTDIR)/sysdeps/generic				\
 	-I$(top_srcdir)ldso/ldso/$(TARGET_ARCH)			\
 	-I$(top_srcdir)ldso/include
 #

libpthread/nptl/sysdeps/arm/sysdep.h → libc/sysdeps/linux/arm/sysdep.h

@@ -17,7 +17,7 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <sysdeps/generic/sysdep.h>
+#include <common/sysdep.h>
 
 #ifdef	__ASSEMBLER__
 

libpthread/nptl/sysdeps/generic/sysdep.h → libc/sysdeps/linux/common/sysdep.h

@@ -17,6 +17,8 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <sys/syscall.h>
+
 #ifndef C_LABEL
 
 /* Define a macro we can use to construct the asm name for a C symbol.  */

libpthread/nptl/sysdeps/unix/sysv/linux/sh/sysdep.h → libc/sysdeps/linux/sh/sysdep.h

@@ -1,8 +1,6 @@
-/* Copyright (C) 1992,1993,1995,1996,1997,1998,1999,2000,2002,2003,2004
-	Free Software Foundation, Inc.
+/* Assembler macros for SH.
+   Copyright (C) 1999, 2000, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
-   Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -19,11 +17,67 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#ifndef _LINUX_SH_SYSDEP_H
-#define _LINUX_SH_SYSDEP_H 1
+#include <common/sysdep.h>
 
-/* There is some commonality.  */
-#include <sysdeps/unix/sh/sysdep.h>
+#include <features.h>
+#include <libc-internal.h>
+
+#ifdef	__ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+#define ALIGNARG(log2) log2
+/* For ELF we need the `.type' directive to make shared libs work right.  */
+#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,@##typearg;
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
+
+#ifdef SHARED
+#define PLTJMP(_x)	_x##@PLT
+#else
+#define PLTJMP(_x)	_x
+#endif
+
+/* Define an entry point visible from C.  */
+#define	ENTRY(name)							      \
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);				      \
+  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),function)			      \
+  .align ALIGNARG(5);							      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+  CALL_MCOUNT
+
+#undef	END
+#define END(name)							      \
+  cfi_endproc;								      \
+  ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(name))
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef	PROF
+#define CALL_MCOUNT					\
+	mov.l	1f,r1;					\
+	sts.l	pr,@-r15;				\
+	cfi_adjust_cfa_offset (4);			\
+	cfi_rel_offset (pr, 0);				\
+	mova	2f,r0;					\
+	jmp	@r1;					\
+	 lds	r0,pr;					\
+	.align	2;					\
+1:	.long	mcount;					\
+2:	lds.l	@r15+,pr;				\
+	cfi_adjust_cfa_offset (-4);			\
+	cfi_restore (pr)
+
+#else
+#define CALL_MCOUNT		/* Do nothing.  */
+#endif
+
+#ifdef	__UCLIBC_UNDERSCORES__
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define	syscall_error	__syscall_error
+#define mcount		_mcount
+#endif
 
 /* For Linux we can use the system call table in the header file
 	/usr/include/asm/unistd.h
@@ -32,8 +86,9 @@
 #undef SYS_ify
 #define SYS_ify(syscall_name)	(__NR_##syscall_name)
 
-
-#ifdef __ASSEMBLER__
+#define ret	rts ; nop
+/* The sh move insn is s, d.  */
+#define MOVE(x,y)	mov x , y
 
 /* Linux uses a negative return value to indicate syscall errors,
    unlike most Unices, which use the condition codes' carry flag.
@@ -193,7 +248,7 @@
 # endif	/* _LIBC_REENTRANT */
 #endif	/* __PIC__ */
 
-# ifdef NEED_SYSCALL_INST_PAD
+# ifdef __SH4__
 #  define SYSCALL_INST_PAD \
 	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
 # else
@@ -220,5 +275,3 @@
  2:
 
 #endif	/* __ASSEMBLER__ */
-
-#endif /* linux/sh/sysdep.h */