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/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
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/>. */
#include <sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.section ".text"; \
ENTRY (__##syscall_name##_nocancel); \
.Lpseudo_nocancel: \
DO_CALL (syscall_name, args); \
.Lpseudo_finish: \
cmn x0, 4095; \
b.cs .Lsyscall_error; \
.subsection 2; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
ENTRY (name); \
SINGLE_THREAD_P(16); \
cbz w16, .Lpseudo_nocancel; \
/* Setup common stack frame no matter the number of args. \
Also save the first arg, since it's basically free. */ \
stp x30, x0, [sp, -64]!; \
cfi_adjust_cfa_offset (64); \
cfi_rel_offset (x30, 0); \
DOCARGS_##args; /* save syscall args around CENABLE. */ \
CENABLE; \
mov x16, x0; /* save mask around syscall. */ \
UNDOCARGS_##args; /* restore syscall args. */ \
DO_CALL (syscall_name, args); \
str x0, [sp, 8]; /* save result around CDISABLE. */ \
mov x0, x16; /* restore mask for CDISABLE. */ \
CDISABLE; \
/* Break down the stack frame, restoring result at once. */ \
ldp x30, x0, [sp], 64; \
cfi_adjust_cfa_offset (-64); \
cfi_restore (x30); \
b .Lpseudo_finish; \
cfi_endproc; \
.size name, .-name; \
.previous
# undef PSEUDO_END
# define PSEUDO_END(name) \
SYSCALL_ERROR_HANDLER; \
cfi_endproc
# define DOCARGS_0
# define DOCARGS_1
# define DOCARGS_2 str x1, [sp, 16]
# define DOCARGS_3 stp x1, x2, [sp, 16]
# define DOCARGS_4 DOCARGS_3; str x3, [sp, 32]
# define DOCARGS_5 DOCARGS_3; stp x3, x4, [sp, 32]
# define DOCARGS_6 DOCARGS_5; str x5, [sp, 48]
# define UNDOCARGS_0
# define UNDOCARGS_1 ldr x0, [sp, 8]
# define UNDOCARGS_2 ldp x0, x1, [sp, 8]
# define UNDOCARGS_3 UNDOCARGS_1; ldp x1, x2, [sp, 16]
# define UNDOCARGS_4 UNDOCARGS_2; ldp x2, x3, [sp, 24]
# define UNDOCARGS_5 UNDOCARGS_3; ldp x3, x4, [sp, 32]
# define UNDOCARGS_6 UNDOCARGS_4; ldp x4, x5, [sp, 40]
# if IS_IN (libpthread)
# define CENABLE bl __pthread_enable_asynccancel
# define CDISABLE bl __pthread_disable_asynccancel
# define __local_multiple_threads __pthread_multiple_threads
# elif IS_IN (libc)
# define CENABLE bl __libc_enable_asynccancel
# define CDISABLE bl __libc_disable_asynccancel
# define __local_multiple_threads __libc_multiple_threads
# elif IS_IN (librt)
# define CENABLE bl __librt_enable_asynccancel
# define CDISABLE bl __librt_disable_asynccancel
# else
# error Unsupported library
# endif
# if IS_IN (libpthread) || IS_IN (libc)
# ifndef __ASSEMBLER__
extern int __local_multiple_threads attribute_hidden;
# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
# else
# define SINGLE_THREAD_P(R) \
adrp x##R, __local_multiple_threads; \
ldr w##R, [x##R, :lo12:__local_multiple_threads]
# endif
# else
/* There is no __local_multiple_threads for librt, so use the TCB. */
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P(R) \
mrs x##R, tpidr_el0; \
sub x##R, x##R, PTHREAD_SIZEOF; \
ldr w##R, [x##R, PTHREAD_MULTIPLE_THREADS_OFFSET]
# endif
# endif
#elif !defined __ASSEMBLER__
/* For rtld, et cetera. */
# define SINGLE_THREAD_P 1
# define NO_CANCELLATION 1
#endif
#ifndef __ASSEMBLER__
# define RTLD_SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
#endif
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