sysdep.h

/* Copyright (C) 1992, 1993, 1995, 1996, 1997, 2002, 2003, 2004
   Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.

   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 _LINUX_ALPHA_SYSDEP_H
#define _LINUX_ALPHA_SYSDEP_H 1

#ifdef __ASSEMBLER__
#include <asm/pal.h>
#include <alpha/regdef.h>
#else
#include <stdint.h>
#endif

/* There is some commonality.  */
#include <sysdeps/unix/alpha/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

/* Define some aliases to make automatic syscall generation work
   properly.  The SYS_* variants are for the benefit of the files in
   sysdeps/unix.  */
#define __NR_getpid	__NR_getxpid
#define __NR_getuid	__NR_getxuid
#define __NR_getgid	__NR_getxgid
#define SYS_getpid	__NR_getxpid
#define SYS_getuid	__NR_getxuid
#define SYS_getgid	__NR_getxgid

/*
 * Some syscalls no Linux program should know about:
 */
#define __NR_osf_sigprocmask	 48
#define __NR_osf_shmat		209
#define __NR_osf_getsysinfo	256
#define __NR_osf_setsysinfo	257

/* Help old kernel headers where particular syscalls are not available.  */
#ifndef __NR_semtimedop
# define __NR_semtimedop	423
#endif

/* This is a kludge to make syscalls.list find these under the names
   pread and pwrite, since some kernel headers define those names
   and some define the *64 names for the same system calls.  */
#if !defined __NR_pread && defined __NR_pread64
# define __NR_pread __NR_pread64
#endif
#if !defined __NR_pwrite && defined __NR_pwrite64
# define __NR_pwrite __NR_pwrite64
#endif

/*
 * In order to get the hidden arguments for rt_sigaction set up
 * properly, we need to call the assembly version.  This shouldn't
 * happen except for inside sigaction.c, where we handle this
 * specially.  Catch other uses and error.
 */

#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...)				\
({									\
	extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1]	\
	  __attribute__((unused));					\
	INLINE_SYSCALL1(name, nr, args);				\
})

#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err_out, nr, args...)			\
({									\
	extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1]	\
	  __attribute__((unused));					\
	INTERNAL_SYSCALL1(name, err_out, nr, args);			\
})

/* Pointer mangling support.  Note that tls access is slow enough that
   we don't deoptimize things by placing the pointer check value there.  */
#if defined NOT_IN_libc && defined IS_IN_rtld
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(dst, src, tmp)				\
	ldah	tmp, __pointer_chk_guard_local($29) !gprelhigh;	\
	ldq	tmp, __pointer_chk_guard_local(tmp) !gprellow;	\
	xor	src, tmp, dst
#  define PTR_MANGLE2(dst, src, tmp)				\
	xor	src, tmp, dst
#  define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
#  define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
# else
extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden;
#  define PTR_MANGLE(var)	\
	(var) = (void *) ((uintptr_t) (var) ^ __pointer_chk_guard_local)
#  define PTR_DEMANGLE(var)  PTR_MANGLE(var)
# endif
#elif defined PIC
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(dst, src, tmp)		\
	ldq	tmp, __pointer_chk_guard;	\
	xor	src, tmp, dst
#  define PTR_MANGLE2(dst, src, tmp)		\
	xor	src, tmp, dst
#  define PTR_DEMANGLE(dst, tmp)   PTR_MANGLE(dst, dst, tmp)
#  define PTR_DEMANGLE2(dst, tmp)  PTR_MANGLE2(dst, dst, tmp)
# else
extern uintptr_t __pointer_chk_guard attribute_relro;
#  define PTR_MANGLE(var)	\
	(var) = (void *) ((uintptr_t) (var) ^ __pointer_chk_guard)
#  define PTR_DEMANGLE(var)  PTR_MANGLE(var)
# endif
#endif

#endif /* _LINUX_ALPHA_SYSDEP_H */