glibc/sysdeps/unix/sysv/linux/ia64/sysdep.h

/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
   Based on code originally written by David Mosberger-Tang

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <sysdeps/unix/sysdep.h>
#include <sysdeps/ia64/sysdep.h>

/* 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
#ifdef __STDC__
# define SYS_ify(syscall_name)	__NR_##syscall_name
#else
# define SYS_ify(syscall_name)	__NR_/**/syscall_name
#endif

#ifdef __ASSEMBLER__

/* 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 %d0 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.  */

/* We don't want the label for the error handler to be visible in the symbol
   table when we define it here.  */
#define SYSCALL_ERROR_LABEL __syscall_error

#ifdef PROF
#error "define CALL_MCOUNT"
#else
#define CALL_MCOUNT
#endif


#undef PSEUDO
#define	PSEUDO(name, syscall_name, args)	\
  ENTRY(name)					\
    DO_CALL (SYS_ify(syscall_name));		\
	cmp.eq p6,p0=-1,r10;;			\
(p6)	br.cond.spnt.few __syscall_error;

#define ENTRY(name)				\
	.psr abi64;				\
	.psr lsb;				\
	.lsb;					\
	.text;					\
	.align 32;				\
	.proc C_SYMBOL_NAME(name);		\
	.global C_SYMBOL_NAME(name);		\
	C_LABEL(name)				\
	CALL_MCOUNT

#define DO_CALL(num)				\
	mov r15=num;				\
	break __BREAK_SYSCALL;

#undef PSEUDO_END
#define PSEUDO_END(name)	.endp C_SYMBOL_NAME(name);

#undef END
#define END(name)						\
	.size	C_SYMBOL_NAME(name), . - C_SYMBOL_NAME(name) ;	\
	.endp	C_SYMBOL_NAME(name)

#define ret			br.ret.sptk.few b0

#else /* not __ASSEMBLER__ */

/* Define a macro which expands into the inline wrapper code for a system
   call.  */
#if 0
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...)	__##name (args)
#endif

#endif /* not __ASSEMBLER__ */