mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 10:50:07 +00:00
71691aae92
Linux removed the last definitions of __NR_pread and __NR_pwrite in commit 4ba66a9760722ccbb691b8f7116cad2f791cca7b, the removal of the blackfin port. All architectures now define __NR_pread64 and __NR_pwrite64 only. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
202 lines
6.3 KiB
C
202 lines
6.3 KiB
C
/* Assembler macros for 64 bit S/390.
|
|
Copyright (C) 2001-2020 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/s390-64/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>
|
|
|
|
/* 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); \
|
|
lghi %r4,-4095 ; \
|
|
clgr %r2,%r4 ; \
|
|
jgnl 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) \
|
|
SYSCALL_ERROR_HANDLER; \
|
|
END (name)
|
|
|
|
#undef PSEUDO_ERRVAL
|
|
#define PSEUDO_ERRVAL(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
lcgr %r2,%r2
|
|
|
|
#undef PSEUDO_END_ERRVAL
|
|
#define PSEUDO_END_ERRVAL(name) \
|
|
SYSCALL_ERROR_HANDLER; \
|
|
END (name)
|
|
|
|
#undef SYSCALL_ERROR_LABEL
|
|
#ifndef PIC
|
|
# undef SYSCALL_ERROR_LABEL
|
|
# define SYSCALL_ERROR_LABEL syscall_error
|
|
# define SYSCALL_ERROR_HANDLER
|
|
#else
|
|
# if RTLD_PRIVATE_ERRNO
|
|
# undef SYSCALL_ERROR_LABEL
|
|
# define SYSCALL_ERROR_LABEL 0f
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
0: larl %r1,rtld_errno; \
|
|
lcr %r2,%r2; \
|
|
st %r2,0(%r1); \
|
|
lghi %r2,-1; \
|
|
br %r14
|
|
# elif defined _LIBC_REENTRANT
|
|
# if IS_IN (libc)
|
|
# define SYSCALL_ERROR_ERRNO __libc_errno
|
|
# else
|
|
# define SYSCALL_ERROR_ERRNO errno
|
|
# endif
|
|
# undef SYSCALL_ERROR_LABEL
|
|
# define SYSCALL_ERROR_LABEL 0f
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
0: lcr %r0,%r2; \
|
|
larl %r1,SYSCALL_ERROR_ERRNO@indntpoff; \
|
|
lg %r1,0(%r1); \
|
|
ear %r2,%a0; \
|
|
sllg %r2,%r2,32; \
|
|
ear %r2,%a1; \
|
|
st %r0,0(%r1,%r2); \
|
|
lghi %r2,-1; \
|
|
br %r14
|
|
# else
|
|
# undef SYSCALL_ERROR_LABEL
|
|
# define SYSCALL_ERROR_LABEL 0f
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
0: larl %r1,_GLOBAL_OFFSET_TABLE_; \
|
|
lg %r1,errno@GOT(%r1); \
|
|
lcr %r2,%r2; \
|
|
st %r2,0(%r1); \
|
|
lghi %r2,-1; \
|
|
br %r14
|
|
# 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; \
|
|
lgr %r0,%r7; \
|
|
lg %r7,160(%r15); \
|
|
.endif; \
|
|
.if SYS_ify (syscall) < 256; \
|
|
svc SYS_ify (syscall); \
|
|
.else; \
|
|
lghi %r1,SYS_ify (syscall); \
|
|
svc 0; \
|
|
.endif; \
|
|
.if args > 5; \
|
|
lgr %r7,%r0; \
|
|
.endif
|
|
|
|
#define ret \
|
|
br 14
|
|
|
|
#define ret_NOERRNO \
|
|
br 14
|
|
|
|
#define ret_ERRVAL \
|
|
br 14
|
|
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
/* 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; \
|
|
sllg tmpreg,tmpreg,32; \
|
|
ear tmpreg,%a1; \
|
|
xg reg,STACK_GUARD(tmpreg)
|
|
# define PTR_MANGLE2(reg, tmpreg) \
|
|
xg 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 */
|