135 lines
4.3 KiB
C
135 lines
4.3 KiB
C
/* Copyright (C) 2003-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <tls.h>
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#ifndef __ASSEMBLER__
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# include <nptl/pthreadP.h>
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#endif
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#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (__##syscall_name##_nocancel); \
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.Lpseudo_nocancel: \
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DO_CALL (syscall_name, args); \
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.Lpseudo_finish: \
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cmn x0, 4095; \
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b.cs .Lsyscall_error; \
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.subsection 2; \
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.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
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ENTRY (name); \
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SINGLE_THREAD_P(16); \
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cbz w16, .Lpseudo_nocancel; \
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/* Setup common stack frame no matter the number of args. \
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Also save the first arg, since it's basically free. */ \
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stp x30, x0, [sp, -64]!; \
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cfi_adjust_cfa_offset (64); \
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cfi_rel_offset (x30, 0); \
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DOCARGS_##args; /* save syscall args around CENABLE. */ \
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CENABLE; \
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mov x16, x0; /* save mask around syscall. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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DO_CALL (syscall_name, args); \
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str x0, [sp, 8]; /* save result around CDISABLE. */ \
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mov x0, x16; /* restore mask for CDISABLE. */ \
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CDISABLE; \
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/* Break down the stack frame, restoring result at once. */ \
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ldp x30, x0, [sp], 64; \
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cfi_adjust_cfa_offset (-64); \
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cfi_restore (x30); \
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b .Lpseudo_finish; \
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cfi_endproc; \
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.size name, .-name; \
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.previous
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER; \
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cfi_endproc
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# define DOCARGS_0
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# define DOCARGS_1
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# define DOCARGS_2 str x1, [sp, 16]
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# define DOCARGS_3 stp x1, x2, [sp, 16]
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# define DOCARGS_4 DOCARGS_3; str x3, [sp, 32]
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# define DOCARGS_5 DOCARGS_3; stp x3, x4, [sp, 32]
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# define DOCARGS_6 DOCARGS_5; str x5, [sp, 48]
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# define UNDOCARGS_0
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# define UNDOCARGS_1 ldr x0, [sp, 8]
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# define UNDOCARGS_2 ldp x0, x1, [sp, 8]
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# define UNDOCARGS_3 UNDOCARGS_1; ldp x1, x2, [sp, 16]
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# define UNDOCARGS_4 UNDOCARGS_2; ldp x2, x3, [sp, 24]
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# define UNDOCARGS_5 UNDOCARGS_3; ldp x3, x4, [sp, 32]
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# define UNDOCARGS_6 UNDOCARGS_4; ldp x4, x5, [sp, 40]
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# if IS_IN (libpthread)
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# define CENABLE bl __pthread_enable_asynccancel
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# define CDISABLE bl __pthread_disable_asynccancel
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# define __local_multiple_threads __pthread_multiple_threads
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# elif IS_IN (libc)
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# define CENABLE bl __libc_enable_asynccancel
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# define CDISABLE bl __libc_disable_asynccancel
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# define __local_multiple_threads __libc_multiple_threads
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# elif IS_IN (librt)
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# define CENABLE bl __librt_enable_asynccancel
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# define CDISABLE bl __librt_disable_asynccancel
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# else
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# error Unsupported library
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# endif
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# if IS_IN (libpthread) || IS_IN (libc)
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# ifndef __ASSEMBLER__
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extern int __local_multiple_threads attribute_hidden;
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# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
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# else
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# define SINGLE_THREAD_P(R) \
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adrp x##R, __local_multiple_threads; \
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ldr w##R, [x##R, :lo12:__local_multiple_threads]
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# endif
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# else
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/* There is no __local_multiple_threads for librt, so use the TCB. */
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# ifndef __ASSEMBLER__
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# define SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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# else
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# define SINGLE_THREAD_P(R) \
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mrs x##R, tpidr_el0; \
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sub x##R, x##R, PTHREAD_SIZEOF; \
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ldr w##R, [x##R, PTHREAD_MULTIPLE_THREADS_OFFSET]
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# endif
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# endif
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#elif !defined __ASSEMBLER__
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/* For rtld, et cetera. */
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# define SINGLE_THREAD_P 1
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# define NO_CANCELLATION 1
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#endif
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#ifndef __ASSEMBLER__
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# define RTLD_SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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#endif
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