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https://sourceware.org/git/glibc.git
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138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
/* Copyright (C) 2003, 2004, 2005 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 !defined NOT_IN_libc || defined IS_IN_libpthread || defined 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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PSEUDO_PROLOGUE; \
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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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PSEUDO_RET; \
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.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
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ENTRY (name); \
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SINGLE_THREAD_P; \
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DOARGS_##args; \
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bne .Lpseudo_cancel; \
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DO_CALL (syscall_name, 0); \
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UNDOARGS_##args; \
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cmn r0, $4096; \
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PSEUDO_RET; \
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.Lpseudo_cancel: \
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DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
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CENABLE; \
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mov ip, r0; /* put mask in safe place. */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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swi SYS_ify (syscall_name); /* do the call. */ \
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str r0, [sp, $-4]!; /* save syscall return value. */ \
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mov r0, ip; /* get mask back. */ \
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CDISABLE; \
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ldmfd sp!, {r0, lr}; /* retrieve return value and address. */ \
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UNDOARGS_##args; \
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cmn r0, $4096;
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# define DOCARGS_0 str lr, [sp, #-4]!;
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# define UNDOCARGS_0
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# define DOCARGS_1 stmfd sp!, {r0, lr};
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# define UNDOCARGS_1 ldr r0, [sp], #4;
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# define DOCARGS_2 stmfd sp!, {r0, r1, lr};
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# define UNDOCARGS_2 ldmfd sp!, {r0, r1};
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# define DOCARGS_3 stmfd sp!, {r0, r1, r2, lr};
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# define UNDOCARGS_3 ldmfd sp!, {r0, r1, r2};
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# define DOCARGS_4 stmfd sp!, {r0, r1, r2, r3, lr};
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# define UNDOCARGS_4 ldmfd sp!, {r0, r1, r2, r3};
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# define DOCARGS_5 DOCARGS_4
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# define UNDOCARGS_5 UNDOCARGS_4
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# define DOCARGS_6 DOCARGS_5
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# define UNDOCARGS_6 UNDOCARGS_5
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# ifdef IS_IN_libpthread
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# define CENABLE bl PLTJMP(__pthread_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel)
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# define __local_multiple_threads __pthread_multiple_threads
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# elif !defined NOT_IN_libc
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# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
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# define __local_multiple_threads __libc_multiple_threads
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# elif defined IS_IN_librt
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# define CENABLE bl PLTJMP(__librt_enable_asynccancel)
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# define CDISABLE bl PLTJMP(__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 defined IS_IN_libpthread || !defined NOT_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 \
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ldr ip, 1b; \
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2: \
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ldr ip, [pc, ip]; \
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teq ip, #0;
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# define PSEUDO_PROLOGUE \
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1: .word __local_multiple_threads - 2f - 8;
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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 PSEUDO_PROLOGUE
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# define SINGLE_THREAD_P \
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stmfd sp!, {r0, lr}; \
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bl __aeabi_read_tp; \
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ldr ip, [r0, #MULTIPLE_THREADS_OFFSET]; \
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ldmfd sp!, {r0, lr}; \
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teq ip, #0
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# define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P
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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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