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

/* Copyright (C) 2000-2019 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
   <https://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 <sysdeps/unix/sysv/linux/s390/sysdep.h>
#include <sysdeps/unix/sysv/linux/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
#  if IS_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)

/* 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
04277e02	1	/* Copyright (C) 2000-2019 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	16	License along with the GNU C Library; if not, see
5a82c748	17	<https://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>
b8386c28	24	#include <sysdeps/unix/sysv/linux/s390/sysdep.h>
fb1cf108	25	#include <sysdeps/unix/sysv/linux/sysdep.h>
2c03b6db	26	#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
00c2b3b9	27	#include <tls.h>
847b055c	28
0480c901 UD	29	/* Define __set_errno() for INLINE_SYSCALL macro below. */
	30	#ifndef __ASSEMBLER__
	31	#include <errno.h>
	32	#endif
	33
847b055c AJ	34	/* For Linux we can use the system call table in the header file
	35	/usr/include/asm/unistd.h
	36	of the kernel. But these symbols do not follow the SYS_* syntax
	37	so we have to redefine the `SYS_ify' macro here. */
	38	/* in newer 2.1 kernels __NR_syscall is missing so we define it here */
	39	#define __NR_syscall 0
	40
	41	#undef SYS_ify
	42	#define SYS_ify(syscall_name) __NR_##syscall_name
	43
847b055c AJ	44	#ifdef __ASSEMBLER__
	45
	46	/* Linux uses a negative return value to indicate syscall errors, unlike
	47	most Unices, which use the condition codes' carry flag.
	48
	49	Since version 2.1 the return value of a system call might be negative
	50	even if the call succeeded. E.g., the `lseek' system call might return
	51	a large offset. Therefore we must not anymore test for < 0, but test
	52	for a real error by making sure the value in gpr2 is a real error
19df733e	53	number. Linus said he will make sure that no syscall returns a value
847b055c AJ	54	in -1 .. -4095 as a valid result so we can savely test with -4095. */
847b055c AJ	55
847b055c AJ	56	#undef PSEUDO
	57	#define PSEUDO(name, syscall_name, args) \
	58	.text; \
d063d164	59	ENTRY (name) \
ffa8d2a0	60	DO_CALL (syscall_name, args); \
847b055c	61	lhi %r4,-4095 ; \
d063d164	62	clr %r2,%r4 ; \
e6ebd2e4	63	jnl SYSCALL_ERROR_LABEL
847b055c AJ	64
	65	#undef PSEUDO_END
	66	#define PSEUDO_END(name) \
	67	SYSCALL_ERROR_HANDLER; \
	68	END (name)
	69
441ee043	70	#undef PSEUDO_NOERRNO
9eb88290 UD	71	#define PSEUDO_NOERRNO(name, syscall_name, args) \
9eb88290 UD	72	.text; \
d063d164	73	ENTRY (name) \
9eb88290 UD	74	DO_CALL (syscall_name, args)
	75
	76	#undef PSEUDO_END_NOERRNO
	77	#define PSEUDO_END_NOERRNO(name) \
	78	END (name)
	79
137ffcdc UD	80	#undef PSEUDO_ERRVAL
	81	#define PSEUDO_ERRVAL(name, syscall_name, args) \
	82	.text; \
d063d164	83	ENTRY (name) \
137ffcdc UD	84	DO_CALL (syscall_name, args); \
	85	lcr %r2,%r2
	86
	87	#undef PSEUDO_END_ERRVAL
	88	#define PSEUDO_END_ERRVAL(name) \
	89	END (name)
	90
847b055c	91	#ifndef PIC
e6ebd2e4 UD	92	# define SYSCALL_ERROR_LABEL 0f
	93	# define SYSCALL_ERROR_HANDLER \
	94	0: basr %r1,0; \
	95	1: l %r1,2f-1b(%r1); \
	96	br %r1; \
	97	2: .long syscall_error
847b055c	98	#else
e6ebd2e4 UD	99	# if RTLD_PRIVATE_ERRNO
	100	# define SYSCALL_ERROR_LABEL 0f
	101	# define SYSCALL_ERROR_HANDLER \
	102	0: basr %r1,0; \
	103	1: al %r1,2f-1b(%r1); \
	104	lcr %r2,%r2; \
	105	st %r2,0(%r1); \
	106	lhi %r2,-1; \
	107	br %r14; \
96c82b3f	108	2: .long rtld_errno-1b
e6ebd2e4	109	# elif defined _LIBC_REENTRANT
4f41c682	110	# if IS_IN (libc)
d063d164 UD	111	# define SYSCALL_ERROR_ERRNO __libc_errno
	112	# else
	113	# define SYSCALL_ERROR_ERRNO errno
	114	# endif
	115	# define SYSCALL_ERROR_LABEL 0f
	116	# define SYSCALL_ERROR_HANDLER \
e6ebd2e4 UD	117	0: lcr %r0,%r2; \
	118	basr %r1,0; \
	119	1: al %r1,2f-1b(%r1); \
00c2b3b9 UD	120	l %r1,SYSCALL_ERROR_ERRNO@gotntpoff(%r1); \
00c2b3b9 UD	121	ear %r2,%a0; \
e6ebd2e4 UD	122	st %r0,0(%r1,%r2); \
	123	lhi %r2,-1; \
	124	br %r14; \
	125	2: .long _GLOBAL_OFFSET_TABLE_-1b
e6ebd2e4 UD	126	# else
	127	# define SYSCALL_ERROR_LABEL 0f
	128	# define SYSCALL_ERROR_HANDLER \
	129	0: basr %r1,0; \
	130	1: al %r1,2f-1b(%r1); \
	131	l %r1,errno@GOT(%r1); \
	132	lcr %r2,%r2; \
	133	st %r2,0(%r1); \
	134	lhi %r2,-1; \
	135	br %r14; \
	136	2: .long _GLOBAL_OFFSET_TABLE_-1b
	137	# endif /* _LIBC_REENTRANT */
847b055c	138	#endif /* PIC */
847b055c AJ	139
	140	/* Linux takes system call arguments in registers:
	141
	142	syscall number 1 call-clobbered
	143	arg 1 2 call-clobbered
	144	arg 2 3 call-clobbered
	145	arg 3 4 call-clobbered
	146	arg 4 5 call-clobbered
	147	arg 5 6 call-saved
8d2e6a03	148	arg 6 7 call-saved
847b055c AJ	149
	150	(Of course a function with say 3 arguments does not have entries for
	151	arguments 4 and 5.)
8d2e6a03 RM	152	For system calls with 6 parameters a stack operation is required
	153	to load the 6th parameter to register 7. Call saved register 7 is
	154	moved to register 0 and back to avoid an additional stack frame.
847b055c AJ	155	*/
847b055c AJ	156
ffa8d2a0	157	#define DO_CALL(syscall, args) \
8d2e6a03 RM	158	.if args > 5; \
	159	lr %r0,%r7; \
	160	l %r7,96(%r15); \
	161	.endif; \
1739d268 UD	162	.if SYS_ify (syscall) < 256; \
	163	svc SYS_ify (syscall); \
	164	.else; \
	165	lhi %r1,SYS_ify (syscall); \
	166	svc 0; \
8d2e6a03 RM	167	.endif; \
	168	.if args > 5; \
	169	lr %r7,%r0; \
1739d268	170	.endif
847b055c AJ	171
	172	#define ret \
	173	br 14
	174
9eb88290 UD	175	#define ret_NOERRNO \
	176	br 14
	177
137ffcdc UD	178	#define ret_ERRVAL \
	179	br 14
	180
847b055c AJ	181	#endif /* __ASSEMBLER__ */
	182
	183	#undef INLINE_SYSCALL
369b849f RM	184	#define INLINE_SYSCALL(name, nr, args...) \
369b849f RM	185	({ \
6aca81bb	186	unsigned int _ret = INTERNAL_SYSCALL (name, , nr, args); \
a1ffb40e	187	if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (_ret, ))) \
369b849f	188	{ \
6aca81bb UD	189	__set_errno (INTERNAL_SYSCALL_ERRNO (_ret, )); \
6aca81bb UD	190	_ret = 0xffffffff; \
369b849f	191	} \
6aca81bb UD	192	(int) _ret; })
	193
	194	#undef INTERNAL_SYSCALL_DECL
	195	#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
847b055c	196
1739d268 UD	197	#undef INTERNAL_SYSCALL_DIRECT
1739d268 UD	198	#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
369b849f RM	199	({ \
369b849f RM	200	DECLARGS_##nr(args) \
31cf3942 SL	201	register int _ret __asm__("2"); \
	202	__asm__ __volatile__ ( \
	203	"svc %b1\n\t" \
	204	: "=d" (_ret) \
	205	: "i" (__NR_##name) ASMFMT_##nr \
	206	: "memory" ); \
d5b6c817	207	_ret; })
369b849f	208
1739d268 UD	209	#undef INTERNAL_SYSCALL_SVC0
	210	#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
	211	({ \
	212	DECLARGS_##nr(args) \
31cf3942 SL	213	register unsigned long _nr __asm__("1") = (unsigned long)(__NR_##name); \
	214	register int _ret __asm__("2"); \
	215	__asm__ __volatile__ ( \
	216	"svc 0\n\t" \
	217	: "=d" (_ret) \
	218	: "d" (_nr) ASMFMT_##nr \
	219	: "memory" ); \
bbb5e55c UD	220	_ret; })
	221
	222	#undef INTERNAL_SYSCALL_NCS
	223	#define INTERNAL_SYSCALL_NCS(no, err, nr, args...) \
	224	({ \
	225	DECLARGS_##nr(args) \
31cf3942 SL	226	register unsigned long _nr __asm__("1") = (unsigned long)(no); \
	227	register int _ret __asm__("2"); \
	228	__asm__ __volatile__ ( \
	229	"svc 0\n\t" \
	230	: "=d" (_ret) \
	231	: "d" (_nr) ASMFMT_##nr \
	232	: "memory" ); \
1739d268 UD	233	_ret; })
	234
	235	#undef INTERNAL_SYSCALL
	236	#define INTERNAL_SYSCALL(name, err, nr, args...) \
aa0e4663 JM	237	(((__NR_##name) < 256) \
	238	? INTERNAL_SYSCALL_DIRECT(name, err, nr, args) \
	239	: INTERNAL_SYSCALL_SVC0(name, err,nr, args))
1739d268	240
369b849f	241	#undef INTERNAL_SYSCALL_ERROR_P
6aca81bb UD	242	#define INTERNAL_SYSCALL_ERROR_P(val, err) \
6aca81bb UD	243	((unsigned int) (val) >= 0xfffff001u)
369b849f RM	244
369b849f RM	245	#undef INTERNAL_SYSCALL_ERRNO
6aca81bb	246	#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
369b849f	247
847b055c AJ	248	#define DECLARGS_0()
847b055c AJ	249	#define DECLARGS_1(arg1) \
31cf3942	250	register unsigned long gpr2 __asm__ ("2") = (unsigned long)(arg1);
847b055c AJ	251	#define DECLARGS_2(arg1, arg2) \
847b055c AJ	252	DECLARGS_1(arg1) \
31cf3942	253	register unsigned long gpr3 __asm__ ("3") = (unsigned long)(arg2);
847b055c AJ	254	#define DECLARGS_3(arg1, arg2, arg3) \
847b055c AJ	255	DECLARGS_2(arg1, arg2) \
31cf3942	256	register unsigned long gpr4 __asm__ ("4") = (unsigned long)(arg3);
847b055c AJ	257	#define DECLARGS_4(arg1, arg2, arg3, arg4) \
847b055c AJ	258	DECLARGS_3(arg1, arg2, arg3) \
31cf3942	259	register unsigned long gpr5 __asm__ ("5") = (unsigned long)(arg4);
847b055c AJ	260	#define DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
847b055c AJ	261	DECLARGS_4(arg1, arg2, arg3, arg4) \
31cf3942	262	register unsigned long gpr6 __asm__ ("6") = (unsigned long)(arg5);
8d2e6a03 RM	263	#define DECLARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \
8d2e6a03 RM	264	DECLARGS_5(arg1, arg2, arg3, arg4, arg5) \
31cf3942	265	register unsigned long gpr7 __asm__ ("7") = (unsigned long)(arg6);
847b055c AJ	266
847b055c AJ	267	#define ASMFMT_0
d5b6c817 UD	268	#define ASMFMT_1 , "0" (gpr2)
	269	#define ASMFMT_2 , "0" (gpr2), "d" (gpr3)
	270	#define ASMFMT_3 , "0" (gpr2), "d" (gpr3), "d" (gpr4)
	271	#define ASMFMT_4 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
	272	#define ASMFMT_5 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6)
8d2e6a03	273	#define ASMFMT_6 , "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5), "d" (gpr6), "d" (gpr7)
847b055c	274
00c2b3b9	275	/* Pointer mangling support. */
a3848485	276	#if IS_IN (rtld)
00c2b3b9 UD	277	/* We cannot use the thread descriptor because in ld.so we use setjmp
	278	earlier than the descriptor is initialized. */
	279	#else
	280	/* For the time being just use stack_guard rather than a separate
	281	pointer_guard. */
	282	# ifdef __ASSEMBLER__
	283	# define PTR_MANGLE(reg, tmpreg) \
	284	ear tmpreg,%a0; \
	285	x reg,STACK_GUARD(tmpreg)
305bb37e UD	286	# define PTR_MANGLE2(reg, tmpreg) \
305bb37e UD	287	x reg,STACK_GUARD(tmpreg)
00c2b3b9 UD	288	# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
	289	# else
	290	# define PTR_MANGLE(var) \
	291	(var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
	292	# define PTR_DEMANGLE(var) PTR_MANGLE (var)
	293	# endif
	294	#endif
	295
847b055c	296	#endif /* _LINUX_S390_SYSDEP_H */