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>

1 files changed, 277 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/sh/sysdep.h b/libc/sysdeps/linux/sh/sysdep.h
new file mode 100644
index 000000000..1d490553d
--- /dev/null
+++ b/libc/sysdeps/linux/sh/sysdep.h
@@ -0,0 +1,277 @@
+/* Assembler macros for SH.
+   Copyright (C) 1999, 2000, 2005 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <common/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
+   of the kernel.  But these symbols do not follow the SYS_* syntax
+   so we have to redefine the `SYS_ify' macro here.  */
+#undef SYS_ify
+#define SYS_ify(syscall_name)	(__NR_##syscall_name)
+
+#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.
+
+   Since version 2.1 the return value of a system call might be
+   negative even if the call succeeded.  E.g., the `lseek' system call
+   might return a large offset.  Therefore we must not anymore test
+   for < 0, but test for a real error by making sure the value in R0
+   is a real error number.  Linus said he will make sure the no syscall
+   returns a value in -1 .. -4095 as a valid result so we can savely
+   test with -4095.  */
+
+#define _IMM1 #-1
+#define _IMM12 #-12
+#undef	PSEUDO
+#define	PSEUDO(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+    DO_CALL (syscall_name, args); \
+    mov r0,r1; \
+    mov _IMM12,r2; \
+    shad r2,r1; \
+    not r1,r1; \
+    tst r1,r1; \
+    bf .Lpseudo_end; \
+    SYSCALL_ERROR_HANDLER; \
+ .Lpseudo_end:
+
+#undef	PSEUDO_END
+#define	PSEUDO_END(name) \
+  END (name)
+
+#undef	PSEUDO_NOERRNO
+#define	PSEUDO_NOERRNO(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+    DO_CALL (syscall_name, args)
+
+#undef	PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name) \
+  END (name)
+
+#define ret_NOERRNO ret
+
+#define	PSEUDO_ERRVAL(name, syscall_name, args) \
+ .text; \
+ ENTRY (name); \
+    DO_CALL (syscall_name, args);
+
+#undef	PSEUDO_END_ERRVAL
+#define	PSEUDO_END_ERRVAL(name) \
+  END (name)
+
+#define ret_ERRVAL ret
+
+#ifndef __PIC__
+# define SYSCALL_ERROR_HANDLER	\
+	mov.l 0f,r1; \
+	jmp @r1; \
+	 mov r0,r4; \
+	.align 2; \
+     0: .long __syscall_error
+
+#include <libc/sysdeps/linux/sh/syscall_error.S>
+#else
+# ifdef RTLD_PRIVATE_ERRNO
+
+#  define SYSCALL_ERROR_HANDLER	\
+	neg r0,r1; \
+	mov.l 0f,r12; \
+	mova 0f,r0; \
+	add r0,r12; \
+	mov.l 1f,r0; \
+	mov.l r1,@(r0,r12)
+	bra .Lpseudo_end; \
+	 mov _IMM1,r0; \
+	.align 2; \
+     0: .long _GLOBAL_OFFSET_TABLE_; \
+     1: .long rtld_errno@GOTOFF
+
+# elif defined _LIBC_REENTRANT
+
+#  if USE___THREAD
+
+#   ifndef NOT_IN_libc
+#    define SYSCALL_ERROR_ERRNO __libc_errno
+#   else
+#    define SYSCALL_ERROR_ERRNO errno
+#   endif
+#   define SYSCALL_ERROR_HANDLER \
+	neg r0,r1; \
+	mov r12,r2; \
+	mov.l 0f,r12; \
+	mova 0f,r0; \
+	add r0,r12; \
+	mov.l 1f,r0; \
+	stc gbr, r4; \
+	mov.l @(r0,r12),r0; \
+	bra .Lskip; \
+	add r4,r0; \
+	.align 2; \
+	1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF; \
+	.Lskip: \
+	mov r2,r12; \
+	mov.l r1,@r0; \
+	bra .Lpseudo_end; \
+	mov _IMM1,r0; \
+	.align 2; \
+	0: .long _GLOBAL_OFFSET_TABLE_
+#  else
+
+#   define SYSCALL_ERROR_HANDLER \
+	neg r0,r1; \
+	mov.l r14,@-r15; \
+	mov.l r12,@-r15; \
+	mov.l r1,@-r15; \
+	mov.l 0f,r12; \
+	mova 0f,r0; \
+	add r0,r12; \
+	sts.l pr,@-r15; \
+	mov r15,r14; \
+	mov.l 1f,r1; \
+	bsrf r1; \
+         nop; \
+     2: mov r14,r15; \
+	lds.l @r15+,pr; \
+	mov.l @r15+,r1; \
+	mov.l r1,@r0; \
+	mov.l @r15+,r12; \
+	mov.l @r15+,r14; \
+	bra .Lpseudo_end; \
+	 mov _IMM1,r0; \
+	.align 2; \
+     0: .long _GLOBAL_OFFSET_TABLE_; \
+     1: .long PLTJMP(C_SYMBOL_NAME(__errno_location))-(2b-.)
+/* A quick note: it is assumed that the call to `__errno_location' does
+   not modify the stack!  */
+#  endif
+# else
+
+/* Store (-r0) into errno through the GOT.  */
+#  define SYSCALL_ERROR_HANDLER						      \
+	neg r0,r1; \
+	mov r12,r2; \
+	mov.l 0f,r12; \
+	mova 0f,r0; \
+	add r0,r12; \
+	mov.l 1f,r0; \
+	mov.l @(r0,r12),r0; \
+	mov r2,r12; \
+	mov.l r1,@r0; \
+	bra .Lpseudo_end; \
+	 mov _IMM1,r0; \
+	.align 2; \
+     0: .long _GLOBAL_OFFSET_TABLE_; \
+     1: .long errno@GOT
+# endif	/* _LIBC_REENTRANT */
+#endif	/* __PIC__ */
+
+# ifdef __SH4__
+#  define SYSCALL_INST_PAD \
+	or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
+# else
+#  define SYSCALL_INST_PAD
+# endif
+
+#define SYSCALL_INST0	trapa #0x10
+#define SYSCALL_INST1	trapa #0x11
+#define SYSCALL_INST2	trapa #0x12
+#define SYSCALL_INST3	trapa #0x13
+#define SYSCALL_INST4	trapa #0x14
+#define SYSCALL_INST5	mov.l @(0,r15),r0; trapa #0x15
+#define SYSCALL_INST6	mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16
+
+#undef	DO_CALL
+#define DO_CALL(syscall_name, args)	\
+    mov.l 1f,r3;			\
+    SYSCALL_INST##args;			\
+    SYSCALL_INST_PAD;			\
+    bra 2f;				\
+     nop;				\
+    .align 2;				\
+ 1: .long SYS_ify (syscall_name);	\
+ 2:
+
+#endif	/* __ASSEMBLER__ */