[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / s390 / s390-32 / sysdep.h

/* Copyright (C) 2000-2014 Free Software Foundation, Inc.
   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
   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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _LINUX_S390_SYSDEP_H
#define _LINUX_S390_SYSDEP_H

#include <sysdeps/s390/s390-32/sysdep.h>
#include <sysdeps/unix/sysdep.h>
#include <dl-sysdep.h>	/* For RTLD_PRIVATE_ERRNO.  */
#include <tls.h>

/* Define __set_errno() for INLINE_SYSCALL macro below.  */
#ifndef __ASSEMBLER__
#include <errno.h>
#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.  */
/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
#define __NR_syscall 0

#undef SYS_ify
#define SYS_ify(syscall_name)	__NR_##syscall_name

#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 gpr2 is a real error
   number.  Linus said he will make sure that no syscall returns a value
   in -1 .. -4095 as a valid result so we can savely test with -4095.  */

#undef PSEUDO
#define	PSEUDO(name, syscall_name, args)				      \
  .text;                                                                      \
  ENTRY (name)								      \
    DO_CALL (syscall_name, args);                                             \
    lhi  %r4,-4095 ;                                                          \
    clr  %r2,%r4 ;							      \
    jnl  SYSCALL_ERROR_LABEL

#undef PSEUDO_END
#define PSEUDO_END(name)						      \
  SYSCALL_ERROR_HANDLER;						      \
  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)

#undef PSEUDO_ERRVAL
#define	PSEUDO_ERRVAL(name, syscall_name, args)				      \
  .text;                                                                      \
  ENTRY (name)								      \
    DO_CALL (syscall_name, args);					      \
    lcr %r2,%r2

#undef PSEUDO_END_ERRVAL
#define PSEUDO_END_ERRVAL(name)						      \
  END (name)

#ifndef PIC
# define SYSCALL_ERROR_LABEL 0f
# define SYSCALL_ERROR_HANDLER \
0:  basr  %r1,0;							      \
1:  l     %r1,2f-1b(%r1);						      \
    br    %r1;								      \
2:  .long syscall_error
#else
# if RTLD_PRIVATE_ERRNO
#  define SYSCALL_ERROR_LABEL 0f
#  define SYSCALL_ERROR_HANDLER \
0:  basr  %r1,0;							      \
1:  al    %r1,2f-1b(%r1);						      \
    lcr   %r2,%r2;							      \
    st    %r2,0(%r1);							      \
    lhi   %r2,-1;							      \
    br    %r14;								      \
2:  .long rtld_errno-1b
# elif defined _LIBC_REENTRANT
#  ifndef NOT_IN_libc
#   define SYSCALL_ERROR_ERRNO __libc_errno
#  else
#   define SYSCALL_ERROR_ERRNO errno
#  endif
#  define SYSCALL_ERROR_LABEL 0f
#  define SYSCALL_ERROR_HANDLER \
0:  lcr   %r0,%r2;							      \
    basr  %r1,0;							      \
1:  al    %r1,2f-1b(%r1);						      \
    l     %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1);			      \
    ear   %r2,%a0;							      \
    st    %r0,0(%r1,%r2);						      \
    lhi   %r2,-1;							      \
    br    %r14;								      \
2:  .long _GLOBAL_OFFSET_TABLE_-1b
# else
#  define SYSCALL_ERROR_LABEL 0f
#  define SYSCALL_ERROR_HANDLER \
0:  basr  %r1,0;							      \
1:  al    %r1,2f-1b(%r1);						      \
    l     %r1,errno@GOT(%r1);						      \
    lcr   %r2,%r2;							      \
    st    %r2,0(%r1);							      \
    lhi   %r2,-1;							      \
    br    %r14;								      \
2:  .long _GLOBAL_OFFSET_TABLE_-1b
# endif /* _LIBC_REENTRANT */
#endif /* PIC */

/* Linux takes system call arguments in registers:

	syscall number	1	     call-clobbered
	arg 1		2	     call-clobbered
	arg 2		3	     call-clobbered
	arg 3		4	     call-clobbered
	arg 4		5	     call-clobbered
	arg 5		6	     call-saved
	arg 6		7	     call-saved

   (Of course a function with say 3 arguments does not have entries for
   arguments 4 and 5.)
   For system calls with 6 parameters a stack operation is required
   to load the 6th parameter to register 7. Call saved register 7 is
   moved to register 0 and back to avoid an additional stack frame.
 */

#define DO_CALL(syscall, args)						      \
  .if args > 5;								      \
    lr %r0,%r7;								      \
    l %r7,96(%r15);							      \
  .endif;								      \
  .if SYS_ify (syscall) < 256;						      \
    svc SYS_ify (syscall);						      \
  .else;								      \
    lhi %r1,SYS_ify (syscall);						      \
    svc 0;								      \
  .endif;								      \
  .if args > 5;								      \
    lr %r7,%r0;								      \
  .endif

#define ret                                                                   \
    br      14

#define ret_NOERRNO							      \
    br      14

#define ret_ERRVAL							      \
    br      14

#endif /* __ASSEMBLER__ */

#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...)				      \
  ({									      \
    unsigned int _ret = INTERNAL_SYSCALL (name, , nr, args);		      \
    if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (_ret, )))		      \
     {									      \
       __set_errno (INTERNAL_SYSCALL_ERRNO (_ret, ));			      \
       _ret = 0xffffffff;						      \
     }									      \
    (int) _ret; })

#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)

#undef INTERNAL_SYSCALL_DIRECT
#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...)			      \
  ({									      \
    DECLARGS_##nr(args)							      \
    register int _ret asm("2");						      \
    asm volatile (							      \
    "svc    %b1\n\t"							      \
    : "=d" (_ret)							      \
    : "i" (__NR_##name) ASMFMT_##nr					      \
    : "memory" );							      \
    _ret; })

#undef INTERNAL_SYSCALL_SVC0
#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...)			      \
  ({									      \
    DECLARGS_##nr(args)							      \
    register unsigned long _nr asm("1") = (unsigned long)(__NR_##name);	      \
    register int _ret asm("2");						      \
    asm volatile (							      \
    "svc    0\n\t"							      \
    : "=d" (_ret)							      \
    : "d" (_nr) ASMFMT_##nr						      \
    : "memory" );							      \
    _ret; })

#undef INTERNAL_SYSCALL_NCS
#define INTERNAL_SYSCALL_NCS(no, err, nr, args...)			      \
  ({									      \
    DECLARGS_##nr(args)							      \
    register unsigned long _nr asm("1") = (unsigned long)(no);		      \
    register int _ret asm("2");						      \
    asm volatile (							      \
    "svc    0\n\t"							      \
    : "=d" (_ret)							      \
    : "d" (_nr) ASMFMT_##nr						      \
    : "memory" );							      \
    _ret; })

#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err, nr, args...)			      \
  (((__NR_##name) < 256) ?						      \
    INTERNAL_SYSCALL_DIRECT(name, err, nr, args) :			      \
    INTERNAL_SYSCALL_SVC0(name, err,nr, args))

#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err)				      \
  ((unsigned int) (val) >= 0xfffff001u)

#undef INTERNAL_SYSCALL_ERRNO
#define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))

#define DECLARGS_0()
#define DECLARGS_1(arg1) \
	register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
#define DECLARGS_2(arg1, arg2) \
	DECLARGS_1(arg1) \
	register unsigned long gpr3 asm ("3") = (unsigned long)(arg2);
#define DECLARGS_3(arg1, arg2, arg3) \
	DECLARGS_2(arg1, arg2) \
	register unsigned long gpr4 asm ("4") = (unsigned long)(arg3);
#define DECLARGS_4(arg1, arg2, arg3, arg4) \
	DECLARGS_3(arg1, arg2, arg3) \
	register unsigned long gpr5 asm ("5") = (unsigned long)(arg4);
#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
	DECLARGS_4(arg1, arg2, arg3, arg4) \
	register unsigned long gpr6 asm ("6") = (unsigned long)(arg5);
#define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
	DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
	register unsigned long gpr7 asm ("7") = (unsigned long)(arg6);

#define ASMFMT_0
#define ASMFMT_1 , "0" (gpr2)
#define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
#define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)

#define CLOBBER_0 , "3", "4", "5"
#define CLOBBER_1 , "3", "4", "5"
#define CLOBBER_2 , "4", "5"
#define CLOBBER_3 , "5"
#define CLOBBER_4
#define CLOBBER_5
#define CLOBBER_6

/* List of system calls which are supported as vsyscalls.  */
#define HAVE_CLOCK_GETRES_VSYSCALL	1
#define HAVE_CLOCK_GETTIME_VSYSCALL	1

/* This version is for kernels that implement system calls that
   behave like function calls as far as register saving.
   It falls back to the syscall in the case that the vDSO doesn't
   exist or fails for ENOSYS */
#ifdef SHARED
# define INLINE_VSYSCALL(name, nr, args...) \
  ({									      \
    __label__ out;							      \
    __label__ iserr;							      \
    long int _ret;							      \
									      \
    if (__vdso_##name != NULL)						      \
      {									      \
	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, , nr, ##args);	      \
	if (!INTERNAL_SYSCALL_ERROR_P (_ret, ))				      \
	  goto out;							      \
	if (INTERNAL_SYSCALL_ERRNO (_ret, ) != ENOSYS)			      \
	  goto iserr;							      \
      }									      \
									      \
    _ret = INTERNAL_SYSCALL (name, , nr, ##args);			      \
    if (INTERNAL_SYSCALL_ERROR_P (_ret, ))				      \
      {									      \
      iserr:								      \
	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, ));			      \
	_ret = -1L;							      \
      }									      \
  out:									      \
    (int) _ret;								      \
  })
#else
# define INLINE_VSYSCALL(name, nr, args...) \
  INLINE_SYSCALL (name, nr, ##args)
#endif

#ifdef SHARED
# define INTERNAL_VSYSCALL(name, err, nr, args...) \
  ({									      \
    __label__ out;							      \
    long int _ret;							      \
									      \
    if (__vdso_##name != NULL)						      \
      {									      \
	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
	if (!INTERNAL_SYSCALL_ERROR_P (_ret, err)			      \
	    || INTERNAL_SYSCALL_ERRNO (_ret, err) != ENOSYS)		      \
	  goto out;							      \
      }									      \
    _ret = INTERNAL_SYSCALL (name, err, nr, ##args);			      \
  out:									      \
    _ret;								      \
  })
#else
# define INTERNAL_VSYSCALL(name, err, nr, args...) \
  INTERNAL_SYSCALL (name, err, nr, ##args)
#endif

/* This version is for internal uses when there is no desire
   to set errno */
#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...)	      \
  ({									      \
    long int _ret = ENOSYS;						      \
									      \
    if (__vdso_##name != NULL)						      \
      _ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);	      \
    else								      \
      err = 1 << 28;							      \
    _ret;								      \
  })

#define INTERNAL_VSYSCALL_NCS(fn, err, nr, args...)			      \
  ({									      \
    DECLARGS_##nr(args)							      \
    register long _ret asm("2");						      \
    asm volatile (							      \
    "lr 10,14\n\t"                                                           \
    "basr 14,%1\n\t"							      \
    "lr 14,10\n\t"                                                           \
    : "=d" (_ret)							      \
    : "d" (fn) ASMFMT_##nr						      \
    : "cc", "memory", "0", "1", "10" CLOBBER_##nr);                          \
    _ret; })

/* Pointer mangling support.  */
#if IS_IN (rtld)
/* We cannot use the thread descriptor because in ld.so we use setjmp
   earlier than the descriptor is initialized.  */
#else
/* For the time being just use stack_guard rather than a separate
   pointer_guard.  */
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(reg, tmpreg) \
  ear     tmpreg,%a0;			\
  x       reg,STACK_GUARD(tmpreg)
#  define PTR_MANGLE2(reg, tmpreg) \
  x       reg,STACK_GUARD(tmpreg)
#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
# else
#  define PTR_MANGLE(var) \
  (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
# endif
#endif

#endif /* _LINUX_S390_SYSDEP_H */
Commit	Line	Data
d4697bc9	1	/* Copyright (C) 2000-2014 Free Software Foundation, Inc.
847b055c AJ	2	Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
847b055c AJ	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	13	Lesser General Public License for more details.
847b055c	14
41bdb6e2	15	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	16	License along with the GNU C Library; if not, see
59ba27a6 PE	17	<http://www.gnu.org/licenses/>. */
847b055c AJ	18
847b055c AJ	19	#ifndef _LINUX_S390_SYSDEP_H
8cbdd648	20	#define _LINUX_S390_SYSDEP_H
847b055c	21
ffeac417	22	#include <sysdeps/s390/s390-32/sysdep.h>
847b055c	23	#include <sysdeps/unix/sysdep.h>
2c03b6db	24	#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
00c2b3b9	25	#include <tls.h>
847b055c	26
0480c901 UD	27	/* Define __set_errno() for INLINE_SYSCALL macro below. */
	28	#ifndef __ASSEMBLER__
	29	#include <errno.h>
	30	#endif
	31
847b055c AJ	32	/* For Linux we can use the system call table in the header file
	33	/usr/include/asm/unistd.h
	34	of the kernel. But these symbols do not follow the SYS_* syntax
	35	so we have to redefine the `SYS_ify' macro here. */
	36	/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
	37	#define __NR_syscall 0
	38
	39	#undef SYS_ify
	40	#define SYS_ify(syscall_name) __NR_##syscall_name
	41
847b055c AJ	42	#ifdef __ASSEMBLER__
	43
	44	/* Linux uses a negative return value to indicate syscall errors, unlike
	45	most Unices, which use the condition codes' carry flag.
	46
	47	Since version 2.1 the return value of a system call might be negative
	48	even if the call succeeded. E.g., the `lseek' system call might return
	49	a large offset. Therefore we must not anymore test for < 0, but test
	50	for a real error by making sure the value in gpr2 is a real error
19df733e	51	number. Linus said he will make sure that no syscall returns a value
847b055c AJ	52	in -1 .. -4095 as a valid result so we can savely test with -4095. */
847b055c AJ	53
847b055c AJ	54	#undef PSEUDO
	55	#define PSEUDO(name, syscall_name, args) \
	56	.text; \
d063d164	57	ENTRY (name) \
ffa8d2a0	58	DO_CALL (syscall_name, args); \
847b055c	59	lhi %r4,-4095 ; \
d063d164	60	clr %r2,%r4 ; \
e6ebd2e4	61	jnl SYSCALL_ERROR_LABEL
847b055c AJ	62
	63	#undef PSEUDO_END
	64	#define PSEUDO_END(name) \
	65	SYSCALL_ERROR_HANDLER; \
	66	END (name)
	67
441ee043	68	#undef PSEUDO_NOERRNO
9eb88290 UD	69	#define PSEUDO_NOERRNO(name, syscall_name, args) \
9eb88290 UD	70	.text; \
d063d164	71	ENTRY (name) \
9eb88290 UD	72	DO_CALL (syscall_name, args)
	73
	74	#undef PSEUDO_END_NOERRNO
	75	#define PSEUDO_END_NOERRNO(name) \
	76	END (name)
	77
137ffcdc UD	78	#undef PSEUDO_ERRVAL
	79	#define PSEUDO_ERRVAL(name, syscall_name, args) \
	80	.text; \
d063d164	81	ENTRY (name) \
137ffcdc UD	82	DO_CALL (syscall_name, args); \
	83	lcr %r2,%r2
	84
	85	#undef PSEUDO_END_ERRVAL
	86	#define PSEUDO_END_ERRVAL(name) \
	87	END (name)
	88
847b055c	89	#ifndef PIC
e6ebd2e4 UD	90	# define SYSCALL_ERROR_LABEL 0f
	91	# define SYSCALL_ERROR_HANDLER \
	92	0: basr %r1,0; \
	93	1: l %r1,2f-1b(%r1); \
	94	br %r1; \
	95	2: .long syscall_error
847b055c	96	#else
e6ebd2e4 UD	97	# if RTLD_PRIVATE_ERRNO
	98	# define SYSCALL_ERROR_LABEL 0f
	99	# define SYSCALL_ERROR_HANDLER \
	100	0: basr %r1,0; \
	101	1: al %r1,2f-1b(%r1); \
	102	lcr %r2,%r2; \
	103	st %r2,0(%r1); \
	104	lhi %r2,-1; \
	105	br %r14; \
96c82b3f	106	2: .long rtld_errno-1b
e6ebd2e4	107	# elif defined _LIBC_REENTRANT
d063d164 UD	108	# ifndef NOT_IN_libc
	109	# define SYSCALL_ERROR_ERRNO __libc_errno
	110	# else
	111	# define SYSCALL_ERROR_ERRNO errno
	112	# endif
	113	# define SYSCALL_ERROR_LABEL 0f
	114	# define SYSCALL_ERROR_HANDLER \
e6ebd2e4 UD	115	0: lcr %r0,%r2; \
	116	basr %r1,0; \
	117	1: al %r1,2f-1b(%r1); \
00c2b3b9 UD	118	l %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1); \
00c2b3b9 UD	119	ear %r2,%a0; \
e6ebd2e4 UD	120	st %r0,0(%r1,%r2); \
	121	lhi %r2,-1; \
	122	br %r14; \
	123	2: .long _GLOBAL_OFFSET_TABLE_-1b
e6ebd2e4 UD	124	# else
	125	# define SYSCALL_ERROR_LABEL 0f
	126	# define SYSCALL_ERROR_HANDLER \
	127	0: basr %r1,0; \
	128	1: al %r1,2f-1b(%r1); \
	129	l %r1,errno@GOT(%r1); \
	130	lcr %r2,%r2; \
	131	st %r2,0(%r1); \
	132	lhi %r2,-1; \
	133	br %r14; \
	134	2: .long _GLOBAL_OFFSET_TABLE_-1b
	135	# endif /* _LIBC_REENTRANT */
847b055c	136	#endif /* PIC */
847b055c AJ	137
	138	/* Linux takes system call arguments in registers:
	139
	140	syscall number 1 call-clobbered
	141	arg 1 2 call-clobbered
	142	arg 2 3 call-clobbered
	143	arg 3 4 call-clobbered
	144	arg 4 5 call-clobbered
	145	arg 5 6 call-saved
8d2e6a03	146	arg 6 7 call-saved
847b055c AJ	147
	148	(Of course a function with say 3 arguments does not have entries for
	149	arguments 4 and 5.)
8d2e6a03 RM	150	For system calls with 6 parameters a stack operation is required
	151	to load the 6th parameter to register 7. Call saved register 7 is
	152	moved to register 0 and back to avoid an additional stack frame.
847b055c AJ	153	*/
847b055c AJ	154
ffa8d2a0	155	#define DO_CALL(syscall, args) \
8d2e6a03 RM	156	.if args > 5; \
	157	lr %r0,%r7; \
	158	l %r7,96(%r15); \
	159	.endif; \
1739d268 UD	160	.if SYS_ify (syscall) < 256; \
	161	svc SYS_ify (syscall); \
	162	.else; \
	163	lhi %r1,SYS_ify (syscall); \
	164	svc 0; \
8d2e6a03 RM	165	.endif; \
	166	.if args > 5; \
	167	lr %r7,%r0; \
1739d268	168	.endif
847b055c AJ	169
	170	#define ret \
	171	br 14
	172
9eb88290 UD	173	#define ret_NOERRNO \
	174	br 14
	175
137ffcdc UD	176	#define ret_ERRVAL \
	177	br 14
	178
847b055c AJ	179	#endif /* __ASSEMBLER__ */
	180
	181	#undef INLINE_SYSCALL
369b849f RM	182	#define INLINE_SYSCALL(name, nr, args...) \
369b849f RM	183	({ \
6aca81bb	184	unsigned int _ret = INTERNAL_SYSCALL (name, , nr, args); \
a1ffb40e	185	if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (_ret, ))) \
369b849f	186	{ \
6aca81bb UD	187	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
6aca81bb UD	188	_ret = 0xffffffff; \
369b849f	189	} \
6aca81bb UD	190	(int) _ret; })
	191
	192	#undef INTERNAL_SYSCALL_DECL
	193	#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
847b055c	194
1739d268 UD	195	#undef INTERNAL_SYSCALL_DIRECT
1739d268 UD	196	#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
369b849f RM	197	({ \
369b849f RM	198	DECLARGS_##nr(args) \
d5b6c817	199	register int _ret asm("2"); \
369b849f	200	asm volatile ( \
369b849f	201	"svc %b1\n\t" \
6aca81bb	202	: "=d" (_ret) \
d5b6c817 UD	203	: "i" (__NR_##name) ASMFMT_##nr \
	204	: "memory" ); \
	205	_ret; })
369b849f	206
1739d268 UD	207	#undef INTERNAL_SYSCALL_SVC0
	208	#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
	209	({ \
	210	DECLARGS_##nr(args) \
	211	register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
	212	register int _ret asm("2"); \
	213	asm volatile ( \
	214	"svc 0\n\t" \
	215	: "=d" (_ret) \
bbb5e55c UD	216	: "d" (_nr) ASMFMT_##nr \
	217	: "memory" ); \
	218	_ret; })
	219
	220	#undef INTERNAL_SYSCALL_NCS
	221	#define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
	222	({ \
	223	DECLARGS_##nr(args) \
	224	register unsigned long _nr asm("1") = (unsigned long)(no); \
	225	register int _ret asm("2"); \
	226	asm volatile ( \
	227	"svc 0\n\t" \
	228	: "=d" (_ret) \
	229	: "d" (_nr) ASMFMT_##nr \
1739d268 UD	230	: "memory" ); \
	231	_ret; })
	232
	233	#undef INTERNAL_SYSCALL
	234	#define INTERNAL_SYSCALL(name, err, nr, args...) \
	235	(((__NR_##name) < 256) ? \
	236	INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
	237	INTERNAL_SYSCALL_SVC0(name, err,nr, args))
	238
369b849f	239	#undef INTERNAL_SYSCALL_ERROR_P
6aca81bb UD	240	#define INTERNAL_SYSCALL_ERROR_P(val, err) \
6aca81bb UD	241	((unsigned int) (val) >= 0xfffff001u)
369b849f RM	242
369b849f RM	243	#undef INTERNAL_SYSCALL_ERRNO
6aca81bb	244	#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
369b849f	245
847b055c AJ	246	#define DECLARGS_0()
847b055c AJ	247	#define DECLARGS_1(arg1) \
d5b6c817	248	register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
847b055c AJ	249	#define DECLARGS_2(arg1, arg2) \
847b055c AJ	250	DECLARGS_1(arg1) \
d5b6c817	251	register unsigned long gpr3 asm ("3") = (unsigned long)(arg2);
847b055c AJ	252	#define DECLARGS_3(arg1, arg2, arg3) \
847b055c AJ	253	DECLARGS_2(arg1, arg2) \
d5b6c817	254	register unsigned long gpr4 asm ("4") = (unsigned long)(arg3);
847b055c AJ	255	#define DECLARGS_4(arg1, arg2, arg3, arg4) \
847b055c AJ	256	DECLARGS_3(arg1, arg2, arg3) \
d5b6c817	257	register unsigned long gpr5 asm ("5") = (unsigned long)(arg4);
847b055c AJ	258	#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
847b055c AJ	259	DECLARGS_4(arg1, arg2, arg3, arg4) \
d5b6c817	260	register unsigned long gpr6 asm ("6") = (unsigned long)(arg5);
8d2e6a03 RM	261	#define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
	262	DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
	263	register unsigned long gpr7 asm ("7") = (unsigned long)(arg6);
847b055c AJ	264
847b055c AJ	265	#define ASMFMT_0
d5b6c817 UD	266	#define ASMFMT_1 , "0" (gpr2)
	267	#define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
	268	#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
	269	#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
	270	#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
8d2e6a03	271	#define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
847b055c	272
0480c901 UD	273	#define CLOBBER_0 , "3", "4", "5"
	274	#define CLOBBER_1 , "3", "4", "5"
	275	#define CLOBBER_2 , "4", "5"
	276	#define CLOBBER_3 , "5"
	277	#define CLOBBER_4
	278	#define CLOBBER_5
	279	#define CLOBBER_6
	280
	281	/* List of system calls which are supported as vsyscalls. */
	282	#define HAVE_CLOCK_GETRES_VSYSCALL 1
	283	#define HAVE_CLOCK_GETTIME_VSYSCALL 1
	284
	285	/* This version is for kernels that implement system calls that
	286	behave like function calls as far as register saving.
	287	It falls back to the syscall in the case that the vDSO doesn't
	288	exist or fails for ENOSYS */
	289	#ifdef SHARED
	290	# define INLINE_VSYSCALL(name, nr, args...) \
	291	({ \
	292	__label__ out; \
	293	__label__ iserr; \
	294	long int _ret; \
	295	\
	296	if (__vdso_##name != NULL) \
	297	{ \
	298	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, , nr, ##args); \
	299	if (!INTERNAL_SYSCALL_ERROR_P (_ret, )) \
	300	goto out; \
	301	if (INTERNAL_SYSCALL_ERRNO (_ret, ) != ENOSYS) \
	302	goto iserr; \
	303	} \
	304	\
	305	_ret = INTERNAL_SYSCALL (name, , nr, ##args); \
	306	if (INTERNAL_SYSCALL_ERROR_P (_ret, )) \
	307	{ \
	308	iserr: \
d063d164 UD	309	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
d063d164 UD	310	_ret = -1L; \
0480c901 UD	311	} \
	312	out: \
	313	(int) _ret; \
	314	})
	315	#else
	316	# define INLINE_VSYSCALL(name, nr, args...) \
	317	INLINE_SYSCALL (name, nr, ##args)
	318	#endif
	319
	320	#ifdef SHARED
	321	# define INTERNAL_VSYSCALL(name, err, nr, args...) \
	322	({ \
	323	__label__ out; \
	324	long int _ret; \
	325	\
	326	if (__vdso_##name != NULL) \
	327	{ \
	328	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
	329	if (!INTERNAL_SYSCALL_ERROR_P (_ret, err) \
	330	\|\| INTERNAL_SYSCALL_ERRNO (_ret, err) != ENOSYS) \
	331	goto out; \
	332	} \
	333	_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \
	334	out: \
	335	_ret; \
	336	})
	337	#else
	338	# define INTERNAL_VSYSCALL(name, err, nr, args...) \
	339	INTERNAL_SYSCALL (name, err, nr, ##args)
	340	#endif
	341
	342	/* This version is for internal uses when there is no desire
	343	to set errno */
	344	#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...) \
	345	({ \
	346	long int _ret = ENOSYS; \
	347	\
	348	if (__vdso_##name != NULL) \
	349	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
	350	else \
	351	err = 1 << 28; \
	352	_ret; \
	353	})
	354
	355	#define INTERNAL_VSYSCALL_NCS(fn, err, nr, args...) \
	356	({ \
	357	DECLARGS_##nr(args) \
	358	register long _ret asm("2"); \
	359	asm volatile ( \
19df733e	360	"lr 10,14\n\t" \
0480c901	361	"basr 14,%1\n\t" \
19df733e	362	"lr 14,10\n\t" \
0480c901 UD	363	: "=d" (_ret) \
0480c901 UD	364	: "d" (fn) ASMFMT_##nr \
19df733e	365	: "cc", "memory", "0", "1", "10" CLOBBER_##nr); \
0480c901	366	_ret; })
00c2b3b9 UD	367
00c2b3b9 UD	368	/* Pointer mangling support. */
a3848485	369	#if IS_IN (rtld)
00c2b3b9 UD	370	/* We cannot use the thread descriptor because in ld.so we use setjmp
	371	earlier than the descriptor is initialized. */
	372	#else
	373	/* For the time being just use stack_guard rather than a separate
	374	pointer_guard. */
	375	# ifdef __ASSEMBLER__
	376	# define PTR_MANGLE(reg, tmpreg) \
	377	ear tmpreg,%a0; \
	378	x reg,STACK_GUARD(tmpreg)
305bb37e UD	379	# define PTR_MANGLE2(reg, tmpreg) \
305bb37e UD	380	x reg,STACK_GUARD(tmpreg)
00c2b3b9 UD	381	# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
	382	# else
	383	# define PTR_MANGLE(var) \
	384	(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
	385	# define PTR_DEMANGLE(var) PTR_MANGLE (var)
	386	# endif
	387	#endif
	388
847b055c	389	#endif /* _LINUX_S390_SYSDEP_H */