glibc/sysdeps/unix/alpha/sysdep.h

/* Copyright (C) 1992, 1995, 1996, 2000, 2003 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.  */

#include <sysdeps/unix/sysdep.h>

#ifdef __ASSEMBLER__

#ifdef __linux__
# include <alpha/regdef.h>
#else
# include <regdef.h>
#endif

#include <tls.h>		/* Defines USE___THREAD.  */

#ifdef IS_IN_rtld
# include <dl-sysdep.h>         /* Defines RTLD_PRIVATE_ERRNO.  */
#endif


#ifdef __STDC__
#define __LABEL(x)	x##:
#else
#define __LABEL(x)	x/**/:
#endif

#define LEAF(name, framesize)			\
  .globl name;					\
  .align 3;					\
  .ent name, 0;					\
  __LABEL(name)					\
  .frame sp, framesize, ra

#define ENTRY(name)				\
  .globl name;					\
  .align 3;					\
  .ent name, 0;					\
  __LABEL(name)					\
  .frame sp, 0, ra

/* Mark the end of function SYM.  */
#undef END
#define END(sym)	.end sym

#ifdef PROF
# define PSEUDO_PROLOGUE			\
	.frame sp, 0, ra;			\
	ldgp	gp,0(pv);			\
	.set noat;				\
	lda	AT,_mcount;			\
	jsr	AT,(AT),_mcount;		\
	.set at;				\
	.prologue 1
#elif defined PIC
# define PSEUDO_PROLOGUE			\
	.frame sp, 0, ra;			\
	.prologue 0
#else
# define PSEUDO_PROLOGUE			\
	.frame sp, 0, ra;			\
	ldgp	gp,0(pv);			\
	.prologue 1
#endif /* PROF */

#if RTLD_PRIVATE_ERRNO
# define SYSCALL_ERROR_LABEL	$syscall_error
# define SYSCALL_ERROR_HANDLER			\
	stl	v0, errno(gp)	!gprel;		\
	lda	v0, -1;				\
	ret
#elif defined(PIC)
# define SYSCALL_ERROR_LABEL	__syscall_error
# define SYSCALL_ERROR_HANDLER \
	br	$31, __syscall_error !samegp
#else
# define SYSCALL_ERROR_LABEL	$syscall_error
# define SYSCALL_ERROR_HANDLER \
	jmp	$31, __syscall_error
#endif /* RTLD_PRIVATE_ERRNO */

/* Overridden by specific syscalls.  */
#undef PSEUDO_PREPARE_ARGS
#define PSEUDO_PREPARE_ARGS	/* Nothing.  */

#define PSEUDO(name, syscall_name, args)	\
	.globl name;				\
	.align 4;				\
	.ent name,0;				\
__LABEL(name)					\
	PSEUDO_PROLOGUE;			\
	PSEUDO_PREPARE_ARGS			\
	lda	v0, SYS_ify(syscall_name);	\
	call_pal PAL_callsys;			\
	bne	a3, SYSCALL_ERROR_LABEL

#undef PSEUDO_END
#if defined(PIC) && !RTLD_PRIVATE_ERRNO
# define PSEUDO_END(sym)  END(sym)
#else
# define PSEUDO_END(sym)			\
$syscall_error:					\
	SYSCALL_ERROR_HANDLER;			\
	END(sym)
#endif

#define PSEUDO_NOERRNO(name, syscall_name, args)	\
	.globl name;					\
	.align 4;					\
	.ent name,0;					\
__LABEL(name)						\
	PSEUDO_PROLOGUE;				\
	PSEUDO_PREPARE_ARGS				\
	lda	v0, SYS_ify(syscall_name);		\
	call_pal PAL_callsys;

#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(sym)  END(sym)

#define ret_NOERRNO ret

#define r0	v0
#define r1	a4

#define MOVE(x,y)	mov x,y

#else /* !ASSEMBLER */

/* ??? Linux needs to be able to override INLINE_SYSCALL for one
   particular special case.  Make this easy.  */

#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
	INLINE_SYSCALL1(name, nr, args)

#define INLINE_SYSCALL1(name, nr, args...)	\
({						\
	long _sc_ret, _sc_err;			\
	inline_syscall##nr(name, args);		\
	if (_sc_err)				\
	  {					\
	    __set_errno (_sc_ret);		\
	    _sc_ret = -1L;			\
	  }					\
	_sc_ret;				\
})

#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
	INTERNAL_SYSCALL1(name, err_out, nr, args)

#define INTERNAL_SYSCALL1(name, err_out, nr, args...)	\
({							\
	long _sc_ret, _sc_err;				\
	inline_syscall##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 USE_TLS
#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 = __NR_##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 inline_syscall1(name,arg1)				\
{								\
	register long _sc_0 inline_syscall_r0_asm;		\
	register long _sc_16 __asm__("$16");			\
	register long _sc_19 __asm__("$19");			\
								\
	_sc_0 = __NR_##name;					\
	_sc_16 = (long) (arg1);					\
	__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 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");			\
								\
	_sc_0 = __NR_##name;					\
	_sc_16 = (long) (arg1);					\
	_sc_17 = (long) (arg2);					\
	__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 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");			\
								\
	_sc_0 = __NR_##name;					\
	_sc_16 = (long) (arg1);					\
	_sc_17 = (long) (arg2);					\
	_sc_18 = (long) (arg3);					\
	__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 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");			\
								\
	_sc_0 = __NR_##name;					\
	_sc_16 = (long) (arg1);					\
	_sc_17 = (long) (arg2);					\
	_sc_18 = (long) (arg3);					\
	_sc_19 = (long) (arg4);					\
	__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 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");			\
								\
	_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__ __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 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");			\
								\
	_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__ __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 */