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

/* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2011
   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 (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_ret, ), 0))	      \
     {									      \
       __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 defined NOT_IN_libc && defined 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
d063d164	1	/* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2011
00c2b3b9	2	Free Software Foundation, Inc.
847b055c AJ	3	Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
	4	This file is part of the GNU C Library.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
847b055c AJ	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
847b055c	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	17	License along with the GNU C Library; if not, see
59ba27a6 PE	18	<http://www.gnu.org/licenses/>. */
847b055c AJ	19
847b055c AJ	20	#ifndef _LINUX_S390_SYSDEP_H
8cbdd648	21	#define _LINUX_S390_SYSDEP_H
847b055c	22
ffeac417	23	#include <sysdeps/s390/s390-32/sysdep.h>
847b055c	24	#include <sysdeps/unix/sysdep.h>
2c03b6db	25	#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
00c2b3b9	26	#include <tls.h>
847b055c	27
0480c901 UD	28	/* Define __set_errno() for INLINE_SYSCALL macro below. */
	29	#ifndef __ASSEMBLER__
	30	#include <errno.h>
	31	#endif
	32
847b055c AJ	33	/* For Linux we can use the system call table in the header file
	34	/usr/include/asm/unistd.h
	35	of the kernel. But these symbols do not follow the SYS_* syntax
	36	so we have to redefine the `SYS_ify' macro here. */
	37	/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
	38	#define __NR_syscall 0
	39
	40	#undef SYS_ify
	41	#define SYS_ify(syscall_name) __NR_##syscall_name
	42
847b055c AJ	43	#ifdef __ASSEMBLER__
	44
	45	/* Linux uses a negative return value to indicate syscall errors, unlike
	46	most Unices, which use the condition codes' carry flag.
	47
	48	Since version 2.1 the return value of a system call might be negative
	49	even if the call succeeded. E.g., the `lseek' system call might return
	50	a large offset. Therefore we must not anymore test for < 0, but test
	51	for a real error by making sure the value in gpr2 is a real error
19df733e	52	number. Linus said he will make sure that no syscall returns a value
847b055c AJ	53	in -1 .. -4095 as a valid result so we can savely test with -4095. */
847b055c AJ	54
847b055c AJ	55	#undef PSEUDO
	56	#define PSEUDO(name, syscall_name, args) \
	57	.text; \
d063d164	58	ENTRY (name) \
ffa8d2a0	59	DO_CALL (syscall_name, args); \
847b055c	60	lhi %r4,-4095 ; \
d063d164	61	clr %r2,%r4 ; \
e6ebd2e4	62	jnl SYSCALL_ERROR_LABEL
847b055c AJ	63
	64	#undef PSEUDO_END
	65	#define PSEUDO_END(name) \
	66	SYSCALL_ERROR_HANDLER; \
	67	END (name)
	68
441ee043	69	#undef PSEUDO_NOERRNO
9eb88290 UD	70	#define PSEUDO_NOERRNO(name, syscall_name, args) \
9eb88290 UD	71	.text; \
d063d164	72	ENTRY (name) \
9eb88290 UD	73	DO_CALL (syscall_name, args)
	74
	75	#undef PSEUDO_END_NOERRNO
	76	#define PSEUDO_END_NOERRNO(name) \
	77	END (name)
	78
137ffcdc UD	79	#undef PSEUDO_ERRVAL
	80	#define PSEUDO_ERRVAL(name, syscall_name, args) \
	81	.text; \
d063d164	82	ENTRY (name) \
137ffcdc UD	83	DO_CALL (syscall_name, args); \
	84	lcr %r2,%r2
	85
	86	#undef PSEUDO_END_ERRVAL
	87	#define PSEUDO_END_ERRVAL(name) \
	88	END (name)
	89
847b055c	90	#ifndef PIC
e6ebd2e4 UD	91	# define SYSCALL_ERROR_LABEL 0f
	92	# define SYSCALL_ERROR_HANDLER \
	93	0: basr %r1,0; \
	94	1: l %r1,2f-1b(%r1); \
	95	br %r1; \
	96	2: .long syscall_error
847b055c	97	#else
e6ebd2e4 UD	98	# if RTLD_PRIVATE_ERRNO
	99	# define SYSCALL_ERROR_LABEL 0f
	100	# define SYSCALL_ERROR_HANDLER \
	101	0: basr %r1,0; \
	102	1: al %r1,2f-1b(%r1); \
	103	lcr %r2,%r2; \
	104	st %r2,0(%r1); \
	105	lhi %r2,-1; \
	106	br %r14; \
96c82b3f	107	2: .long rtld_errno-1b
e6ebd2e4	108	# elif defined _LIBC_REENTRANT
d063d164 UD	109	# ifndef NOT_IN_libc
	110	# define SYSCALL_ERROR_ERRNO __libc_errno
	111	# else
	112	# define SYSCALL_ERROR_ERRNO errno
	113	# endif
	114	# define SYSCALL_ERROR_LABEL 0f
	115	# define SYSCALL_ERROR_HANDLER \
e6ebd2e4 UD	116	0: lcr %r0,%r2; \
	117	basr %r1,0; \
	118	1: al %r1,2f-1b(%r1); \
00c2b3b9 UD	119	l %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1); \
00c2b3b9 UD	120	ear %r2,%a0; \
e6ebd2e4 UD	121	st %r0,0(%r1,%r2); \
	122	lhi %r2,-1; \
	123	br %r14; \
	124	2: .long _GLOBAL_OFFSET_TABLE_-1b
e6ebd2e4 UD	125	# else
	126	# define SYSCALL_ERROR_LABEL 0f
	127	# define SYSCALL_ERROR_HANDLER \
	128	0: basr %r1,0; \
	129	1: al %r1,2f-1b(%r1); \
	130	l %r1,errno@GOT(%r1); \
	131	lcr %r2,%r2; \
	132	st %r2,0(%r1); \
	133	lhi %r2,-1; \
	134	br %r14; \
	135	2: .long _GLOBAL_OFFSET_TABLE_-1b
	136	# endif /* _LIBC_REENTRANT */
847b055c	137	#endif /* PIC */
847b055c AJ	138
	139	/* Linux takes system call arguments in registers:
	140
	141	syscall number 1 call-clobbered
	142	arg 1 2 call-clobbered
	143	arg 2 3 call-clobbered
	144	arg 3 4 call-clobbered
	145	arg 4 5 call-clobbered
	146	arg 5 6 call-saved
8d2e6a03	147	arg 6 7 call-saved
847b055c AJ	148
	149	(Of course a function with say 3 arguments does not have entries for
	150	arguments 4 and 5.)
8d2e6a03 RM	151	For system calls with 6 parameters a stack operation is required
	152	to load the 6th parameter to register 7. Call saved register 7 is
	153	moved to register 0 and back to avoid an additional stack frame.
847b055c AJ	154	*/
847b055c AJ	155
ffa8d2a0	156	#define DO_CALL(syscall, args) \
8d2e6a03 RM	157	.if args > 5; \
	158	lr %r0,%r7; \
	159	l %r7,96(%r15); \
	160	.endif; \
1739d268 UD	161	.if SYS_ify (syscall) < 256; \
	162	svc SYS_ify (syscall); \
	163	.else; \
	164	lhi %r1,SYS_ify (syscall); \
	165	svc 0; \
8d2e6a03 RM	166	.endif; \
	167	.if args > 5; \
	168	lr %r7,%r0; \
1739d268	169	.endif
847b055c AJ	170
	171	#define ret \
	172	br 14
	173
9eb88290 UD	174	#define ret_NOERRNO \
	175	br 14
	176
137ffcdc UD	177	#define ret_ERRVAL \
	178	br 14
	179
847b055c AJ	180	#endif /* __ASSEMBLER__ */
	181
	182	#undef INLINE_SYSCALL
369b849f RM	183	#define INLINE_SYSCALL(name, nr, args...) \
369b849f RM	184	({ \
6aca81bb UD	185	unsigned int _ret = INTERNAL_SYSCALL (name, , nr, args); \
6aca81bb UD	186	if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_ret, ), 0)) \
369b849f	187	{ \
6aca81bb UD	188	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
6aca81bb UD	189	_ret = 0xffffffff; \
369b849f	190	} \
6aca81bb UD	191	(int) _ret; })
	192
	193	#undef INTERNAL_SYSCALL_DECL
	194	#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
847b055c	195
1739d268 UD	196	#undef INTERNAL_SYSCALL_DIRECT
1739d268 UD	197	#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
369b849f RM	198	({ \
369b849f RM	199	DECLARGS_##nr(args) \
d5b6c817	200	register int _ret asm("2"); \
369b849f	201	asm volatile ( \
369b849f	202	"svc %b1\n\t" \
6aca81bb	203	: "=d" (_ret) \
d5b6c817 UD	204	: "i" (__NR_##name) ASMFMT_##nr \
	205	: "memory" ); \
	206	_ret; })
369b849f	207
1739d268 UD	208	#undef INTERNAL_SYSCALL_SVC0
	209	#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
	210	({ \
	211	DECLARGS_##nr(args) \
	212	register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
	213	register int _ret asm("2"); \
	214	asm volatile ( \
	215	"svc 0\n\t" \
	216	: "=d" (_ret) \
bbb5e55c UD	217	: "d" (_nr) ASMFMT_##nr \
	218	: "memory" ); \
	219	_ret; })
	220
	221	#undef INTERNAL_SYSCALL_NCS
	222	#define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
	223	({ \
	224	DECLARGS_##nr(args) \
	225	register unsigned long _nr asm("1") = (unsigned long)(no); \
	226	register int _ret asm("2"); \
	227	asm volatile ( \
	228	"svc 0\n\t" \
	229	: "=d" (_ret) \
	230	: "d" (_nr) ASMFMT_##nr \
1739d268 UD	231	: "memory" ); \
	232	_ret; })
	233
	234	#undef INTERNAL_SYSCALL
	235	#define INTERNAL_SYSCALL(name, err, nr, args...) \
	236	(((__NR_##name) < 256) ? \
	237	INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
	238	INTERNAL_SYSCALL_SVC0(name, err,nr, args))
	239
369b849f	240	#undef INTERNAL_SYSCALL_ERROR_P
6aca81bb UD	241	#define INTERNAL_SYSCALL_ERROR_P(val, err) \
6aca81bb UD	242	((unsigned int) (val) >= 0xfffff001u)
369b849f RM	243
369b849f RM	244	#undef INTERNAL_SYSCALL_ERRNO
6aca81bb	245	#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
369b849f	246
847b055c AJ	247	#define DECLARGS_0()
847b055c AJ	248	#define DECLARGS_1(arg1) \
d5b6c817	249	register unsigned long gpr2 asm ("2") = (unsigned long)(arg1);
847b055c AJ	250	#define DECLARGS_2(arg1, arg2) \
847b055c AJ	251	DECLARGS_1(arg1) \
d5b6c817	252	register unsigned long gpr3 asm ("3") = (unsigned long)(arg2);
847b055c AJ	253	#define DECLARGS_3(arg1, arg2, arg3) \
847b055c AJ	254	DECLARGS_2(arg1, arg2) \
d5b6c817	255	register unsigned long gpr4 asm ("4") = (unsigned long)(arg3);
847b055c AJ	256	#define DECLARGS_4(arg1, arg2, arg3, arg4) \
847b055c AJ	257	DECLARGS_3(arg1, arg2, arg3) \
d5b6c817	258	register unsigned long gpr5 asm ("5") = (unsigned long)(arg4);
847b055c AJ	259	#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
847b055c AJ	260	DECLARGS_4(arg1, arg2, arg3, arg4) \
d5b6c817	261	register unsigned long gpr6 asm ("6") = (unsigned long)(arg5);
8d2e6a03 RM	262	#define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
	263	DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
	264	register unsigned long gpr7 asm ("7") = (unsigned long)(arg6);
847b055c AJ	265
847b055c AJ	266	#define ASMFMT_0
d5b6c817 UD	267	#define ASMFMT_1 , "0" (gpr2)
	268	#define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
	269	#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
	270	#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
	271	#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
8d2e6a03	272	#define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
847b055c	273
0480c901 UD	274	#define CLOBBER_0 , "3", "4", "5"
	275	#define CLOBBER_1 , "3", "4", "5"
	276	#define CLOBBER_2 , "4", "5"
	277	#define CLOBBER_3 , "5"
	278	#define CLOBBER_4
	279	#define CLOBBER_5
	280	#define CLOBBER_6
	281
	282	/* List of system calls which are supported as vsyscalls. */
	283	#define HAVE_CLOCK_GETRES_VSYSCALL 1
	284	#define HAVE_CLOCK_GETTIME_VSYSCALL 1
	285
	286	/* This version is for kernels that implement system calls that
	287	behave like function calls as far as register saving.
	288	It falls back to the syscall in the case that the vDSO doesn't
	289	exist or fails for ENOSYS */
	290	#ifdef SHARED
	291	# define INLINE_VSYSCALL(name, nr, args...) \
	292	({ \
	293	__label__ out; \
	294	__label__ iserr; \
	295	long int _ret; \
	296	\
	297	if (__vdso_##name != NULL) \
	298	{ \
	299	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, , nr, ##args); \
	300	if (!INTERNAL_SYSCALL_ERROR_P (_ret, )) \
	301	goto out; \
	302	if (INTERNAL_SYSCALL_ERRNO (_ret, ) != ENOSYS) \
	303	goto iserr; \
	304	} \
	305	\
	306	_ret = INTERNAL_SYSCALL (name, , nr, ##args); \
	307	if (INTERNAL_SYSCALL_ERROR_P (_ret, )) \
	308	{ \
	309	iserr: \
d063d164 UD	310	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
d063d164 UD	311	_ret = -1L; \
0480c901 UD	312	} \
	313	out: \
	314	(int) _ret; \
	315	})
	316	#else
	317	# define INLINE_VSYSCALL(name, nr, args...) \
	318	INLINE_SYSCALL (name, nr, ##args)
	319	#endif
	320
	321	#ifdef SHARED
	322	# define INTERNAL_VSYSCALL(name, err, nr, args...) \
	323	({ \
	324	__label__ out; \
	325	long int _ret; \
	326	\
	327	if (__vdso_##name != NULL) \
	328	{ \
	329	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
	330	if (!INTERNAL_SYSCALL_ERROR_P (_ret, err) \
	331	\|\| INTERNAL_SYSCALL_ERRNO (_ret, err) != ENOSYS) \
	332	goto out; \
	333	} \
	334	_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \
	335	out: \
	336	_ret; \
	337	})
	338	#else
	339	# define INTERNAL_VSYSCALL(name, err, nr, args...) \
	340	INTERNAL_SYSCALL (name, err, nr, ##args)
	341	#endif
	342
	343	/* This version is for internal uses when there is no desire
	344	to set errno */
	345	#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...) \
	346	({ \
	347	long int _ret = ENOSYS; \
	348	\
	349	if (__vdso_##name != NULL) \
	350	_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
	351	else \
	352	err = 1 << 28; \
	353	_ret; \
	354	})
	355
	356	#define INTERNAL_VSYSCALL_NCS(fn, err, nr, args...) \
	357	({ \
	358	DECLARGS_##nr(args) \
	359	register long _ret asm("2"); \
	360	asm volatile ( \
19df733e	361	"lr 10,14\n\t" \
0480c901	362	"basr 14,%1\n\t" \
19df733e	363	"lr 14,10\n\t" \
0480c901 UD	364	: "=d" (_ret) \
0480c901 UD	365	: "d" (fn) ASMFMT_##nr \
19df733e	366	: "cc", "memory", "0", "1", "10" CLOBBER_##nr); \
0480c901	367	_ret; })
00c2b3b9 UD	368
	369	/* Pointer mangling support. */
	370	#if defined NOT_IN_libc && defined IS_IN_rtld
	371	/* We cannot use the thread descriptor because in ld.so we use setjmp
	372	earlier than the descriptor is initialized. */
	373	#else
	374	/* For the time being just use stack_guard rather than a separate
	375	pointer_guard. */
	376	# ifdef __ASSEMBLER__
	377	# define PTR_MANGLE(reg, tmpreg) \
	378	ear tmpreg,%a0; \
	379	x reg,STACK_GUARD(tmpreg)
305bb37e UD	380	# define PTR_MANGLE2(reg, tmpreg) \
305bb37e UD	381	x reg,STACK_GUARD(tmpreg)
00c2b3b9 UD	382	# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
	383	# else
	384	# define PTR_MANGLE(var) \
	385	(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
	386	# define PTR_DEMANGLE(var) PTR_MANGLE (var)
	387	# endif
	388	#endif
	389
847b055c	390	#endif /* _LINUX_S390_SYSDEP_H */