syscall: unify common syscall defines

Unify all the common syscall defines in syscalls-common.h and scrub all
the duplicated code from relevant ports.  This should also make converting
existing ports to INLINE_SYSCALL() much easier as they don't have to get
lost in all the unrelated noise, as well as creating new ports.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 233 insertions, 168 deletions

diff --git a/libc/sysdeps/linux/alpha/bits/syscalls.h b/libc/sysdeps/linux/alpha/bits/syscalls.h
index b5e0c1602..6be26971f 100644
--- a/libc/sysdeps/linux/alpha/bits/syscalls.h
+++ b/libc/sysdeps/linux/alpha/bits/syscalls.h
@@ -1,3 +1,23 @@
+/* Copyright (C) 1992, 1995, 1996, 2000, 2003, 2004, 2006
+   Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Brendan Kehoe (brendan@zen.org).
+
+   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.  */
+
 #ifndef _BITS_SYSCALLS_H
 #define _BITS_SYSCALLS_H
 #ifndef _SYSCALL_H
@@ -6,186 +26,231 @@
 
 #ifndef __ASSEMBLER__
 
-#include <errno.h>
-
-#define SYS_ify(syscall_name)  (__NR_##syscall_name)
-
-#define _syscall_return(type)						\
-	return (_sc_err ? __set_errno(_sc_ret), _sc_ret = -1L : 0), (type) _sc_ret
-
-#define _syscall_clobbers						\
-	"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",			\
-	"$22", "$23", "$24", "$25", "$27", "$28" 			\
-
-#define _syscall0(type, name)						\
-type name(void)								\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_19 __asm__("$19");			\
-									\
-		_sc_0 = __NR_##name;					\
-		__asm__("callsys # %0 %1 %2"				\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0)					\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define INLINE_SYSCALL(name, nr, args...)	\
+({						\
+	long _sc_ret, _sc_err;			\
+	inline_syscall##nr(__NR_##name, args);	\
+	if (__builtin_expect (_sc_err, 0))	\
+	  {					\
+	    __set_errno (_sc_ret);		\
+	    _sc_ret = -1L;			\
+	  }					\
+	_sc_ret;				\
+})
+
+#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
+({							\
+	long _sc_ret, _sc_err;				\
+	inline_syscall##nr(__NR_##name, args);		\
+	err_out = _sc_err;				\
+	_sc_ret;					\
+})
+
+#define INTERNAL_SYSCALL_DECL(err)		long int err
+#define INTERNAL_SYSCALL_ERROR_P(val, err)	err
+#define INTERNAL_SYSCALL_ERRNO(val, err)	val
+
+#define inline_syscall_clobbers				\
+	"$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",	\
+	"$22", "$23", "$24", "$25", "$27", "$28", "memory"
+
+/* If TLS is in use, we have a conflict between the PAL_rduniq primitive,
+   as modeled within GCC, and explicit use of the R0 register.  If we use
+   the register via the asm, the scheduler may place the PAL_rduniq insn
+   before we've copied the data from R0 into _sc_ret.  If this happens
+   we'll get a reload abort, since R0 is live at the same time it is
+   needed for the PAL_rduniq.
+
+   Solve this by using the "v" constraint instead of an asm for the syscall
+   output.  We don't do this unconditionally to allow compilation with
+   older compilers.  */
+
+#ifdef HAVE___THREAD
+#define inline_syscall_r0_asm
+#define inline_syscall_r0_out_constraint	"=v"
+#else
+#define inline_syscall_r0_asm			__asm__("$0")
+#define inline_syscall_r0_out_constraint	"=r"
+#endif
+
+/* It is moderately important optimization-wise to limit the lifetime
+   of the hard-register variables as much as possible.  Thus we copy
+   in/out as close to the asm as possible.  */
+
+#define inline_syscall0(name, args...)				\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_19 __asm__("$19");			\
+								\
+	_sc_0 = name;						\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2"				\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19)					\
+	   : "0"(_sc_0)						\
+	   : inline_syscall_clobbers,				\
+	     "$16", "$17", "$18", "$20", "$21");		\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall1(type,name,type1,arg1)					\
-type name(type1 arg1)							\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_19 __asm__("$19");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		__asm__("callsys # %0 %1 %2 %3"				\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16)			\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall1(name,arg1)				\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _tmp_16 = (long) (arg1);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3"				\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16)				\
+	   : "0"(_sc_0), "2"(_sc_16)				\
+	   : inline_syscall_clobbers,				\
+	     "$17", "$18", "$20", "$21");			\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall2(type,name,type1,arg1,type2,arg2)			\
-type name(type1 arg1,type2 arg2)					\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_17 __asm__("$17");			\
-		register long _sc_19 __asm__("$19");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		_sc_17 = (long) (arg2);					\
-		__asm__("callsys # %0 %1 %2 %3 %4"			\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17)		\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall2(name,arg1,arg2)				\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_17 __asm__("$17");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _tmp_16 = (long) (arg1);			\
+	register long _tmp_17 = (long) (arg2);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	_sc_17 = _tmp_17;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4"			\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17)		\
+	   : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17)		\
+	   : inline_syscall_clobbers,				\
+	     "$18", "$20", "$21");				\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)		\
-type name(type1 arg1,type2 arg2,type3 arg3)				\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_17 __asm__("$17");			\
-		register long _sc_18 __asm__("$18");			\
-		register long _sc_19 __asm__("$19");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		_sc_17 = (long) (arg2);					\
-		_sc_18 = (long) (arg3);					\
-		__asm__("callsys # %0 %1 %2 %3 %4 %5"			\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
-			  "r"(_sc_18)					\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall3(name,arg1,arg2,arg3)			\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_17 __asm__("$17");			\
+	register long _sc_18 __asm__("$18");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _tmp_16 = (long) (arg1);			\
+	register long _tmp_17 = (long) (arg2);			\
+	register long _tmp_18 = (long) (arg3);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	_sc_17 = _tmp_17;					\
+	_sc_18 = _tmp_18;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5"			\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17),		\
+	     "=r"(_sc_18)					\
+	   : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17),		\
+	     "4"(_sc_18)					\
+	   : inline_syscall_clobbers, "$20", "$21");		\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
-type name (type1 arg1, type2 arg2, type3 arg3, type4 arg4)		 \
-{									 \
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_17 __asm__("$17");			\
-		register long _sc_18 __asm__("$18");			\
-		register long _sc_19 __asm__("$19");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		_sc_17 = (long) (arg2);					\
-		_sc_18 = (long) (arg3);					\
-		_sc_19 = (long) (arg4);					\
-		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6"		\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
-			  "r"(_sc_18), "1"(_sc_19)			\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall4(name,arg1,arg2,arg3,arg4)		\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_17 __asm__("$17");			\
+	register long _sc_18 __asm__("$18");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _tmp_16 = (long) (arg1);			\
+	register long _tmp_17 = (long) (arg2);			\
+	register long _tmp_18 = (long) (arg3);			\
+	register long _tmp_19 = (long) (arg4);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	_sc_17 = _tmp_17;					\
+	_sc_18 = _tmp_18;					\
+	_sc_19 = _tmp_19;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6"			\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17),		\
+	     "=r"(_sc_18)					\
+	   : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17),		\
+	     "4"(_sc_18), "1"(_sc_19)				\
+	   : inline_syscall_clobbers, "$20", "$21");		\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
-	  type5,arg5)							 \
-type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5)	\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_17 __asm__("$17");			\
-		register long _sc_18 __asm__("$18");			\
-		register long _sc_19 __asm__("$19");			\
-		register long _sc_20 __asm__("$20");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		_sc_17 = (long) (arg2);					\
-		_sc_18 = (long) (arg3);					\
-		_sc_19 = (long) (arg4);					\
-		_sc_20 = (long) (arg5);					\
-		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6 %7"		\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
-			  "r"(_sc_18), "1"(_sc_19), "r"(_sc_20)		\
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5)		\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_17 __asm__("$17");			\
+	register long _sc_18 __asm__("$18");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _sc_20 __asm__("$20");			\
+	register long _tmp_16 = (long) (arg1);			\
+	register long _tmp_17 = (long) (arg2);			\
+	register long _tmp_18 = (long) (arg3);			\
+	register long _tmp_19 = (long) (arg4);			\
+	register long _tmp_20 = (long) (arg5);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	_sc_17 = _tmp_17;					\
+	_sc_18 = _tmp_18;					\
+	_sc_19 = _tmp_19;					\
+	_sc_20 = _tmp_20;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7"		\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17),		\
+	     "=r"(_sc_18), "=r"(_sc_20)				\
+	   : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17),		\
+	     "4"(_sc_18), "1"(_sc_19), "5"(_sc_20)		\
+	   : inline_syscall_clobbers, "$21");			\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
-#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
-	  type5,arg5,type6,arg6)					 \
-type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6)\
-{									\
-	long _sc_ret, _sc_err;						\
-	{								\
-		register long _sc_0 __asm__("$0");			\
-		register long _sc_16 __asm__("$16");			\
-		register long _sc_17 __asm__("$17");			\
-		register long _sc_18 __asm__("$18");			\
-		register long _sc_19 __asm__("$19");			\
-		register long _sc_20 __asm__("$20");			\
-		register long _sc_21 __asm__("$21");			\
-									\
-		_sc_0 = __NR_##name;					\
-		_sc_16 = (long) (arg1);					\
-		_sc_17 = (long) (arg2);					\
-		_sc_18 = (long) (arg3);					\
-		_sc_19 = (long) (arg4);					\
-		_sc_20 = (long) (arg5);					\
-		_sc_21 = (long) (arg6);					\
-		__asm__("callsys # %0 %1 %2 %3 %4 %5 %6 %7 %8"		\
-			: "=r"(_sc_0), "=r"(_sc_19)			\
-			: "0"(_sc_0), "r"(_sc_16), "r"(_sc_17),		\
-			  "r"(_sc_18), "1"(_sc_19), "r"(_sc_20), "r"(_sc_21) \
-			: _syscall_clobbers);				\
-		_sc_ret = _sc_0, _sc_err = _sc_19;			\
-	}								\
-	_syscall_return(type);						\
+#define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6)	\
+{								\
+	register long _sc_0 inline_syscall_r0_asm;		\
+	register long _sc_16 __asm__("$16");			\
+	register long _sc_17 __asm__("$17");			\
+	register long _sc_18 __asm__("$18");			\
+	register long _sc_19 __asm__("$19");			\
+	register long _sc_20 __asm__("$20");			\
+	register long _sc_21 __asm__("$21");			\
+	register long _tmp_16 = (long) (arg1);			\
+	register long _tmp_17 = (long) (arg2);			\
+	register long _tmp_18 = (long) (arg3);			\
+	register long _tmp_19 = (long) (arg4);			\
+	register long _tmp_20 = (long) (arg5);			\
+	register long _tmp_21 = (long) (arg6);			\
+								\
+	_sc_0 = name;						\
+	_sc_16 = _tmp_16;					\
+	_sc_17 = _tmp_17;					\
+	_sc_18 = _tmp_18;					\
+	_sc_19 = _tmp_19;					\
+	_sc_20 = _tmp_20;					\
+	_sc_21 = _tmp_21;					\
+	__asm__ __volatile__					\
+	  ("callsys # %0 %1 <= %2 %3 %4 %5 %6 %7 %8"		\
+	   : inline_syscall_r0_out_constraint (_sc_0),		\
+	     "=r"(_sc_19), "=r"(_sc_16), "=r"(_sc_17),		\
+	     "=r"(_sc_18), "=r"(_sc_20), "=r"(_sc_21)		\
+	   : "0"(_sc_0), "2"(_sc_16), "3"(_sc_17), "4"(_sc_18),	\
+	     "1"(_sc_19), "5"(_sc_20), "6"(_sc_21)		\
+	   : inline_syscall_clobbers);				\
+	_sc_ret = _sc_0, _sc_err = _sc_19;			\
 }
 
 #endif /* __ASSEMBLER__ */