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110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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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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/* The code to disable cancellation depends on the fact that the called
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functions are special. They don't modify registers other than %rax
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and %r11 if they return. Therefore we don't have to preserve other
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registers around these calls. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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SINGLE_THREAD_P; \
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jne L(pseudo_cancel); \
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.type __##syscall_name##_nocancel,@function; \
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.globl __##syscall_name##_nocancel; \
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__##syscall_name##_nocancel: \
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DO_CALL (syscall_name, args); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL; \
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ret; \
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.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
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L(pseudo_cancel): \
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/* We always have to align the stack before calling a function. */ \
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subq $8, %rsp; cfi_adjust_cfa_offset (8); \
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CENABLE \
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/* The return value from CENABLE is argument for CDISABLE. */ \
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movq %rax, (%rsp); \
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DO_CALL (syscall_name, args); \
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movq (%rsp), %rdi; \
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/* Save %rax since it's the error code from the syscall. */ \
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movq %rax, %rdx; \
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CDISABLE \
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movq %rdx, %rax; \
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addq $8,%rsp; cfi_adjust_cfa_offset (-8); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL
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# if IS_IN (libpthread)
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# define CENABLE call __pthread_enable_asynccancel;
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# define CDISABLE call __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 call __libc_enable_asynccancel;
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# define CDISABLE call __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 call __librt_enable_asynccancel;
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# define CDISABLE call __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 \
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__builtin_expect (__local_multiple_threads == 0, 1)
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# else
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# define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
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# endif
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# else
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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 cmpl $0, %fs:MULTIPLE_THREADS_OFFSET
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# endif
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# endif
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#elif !defined __ASSEMBLER__
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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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