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Cancellation support for syscalls on Linux/Alpha.
This commit is contained in:
Ulrich Drepper
parent
1cb990bc19
commit
5d6b8f4820
127
linuxthreads/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h
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127
linuxthreads/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h
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/* Copyright (C) 2003 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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#ifndef __ASSEMBLER__
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# include <linuxthreads/internals.h>
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#endif
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#if !defined NOT_IN_libc || defined IS_IN_libpthread
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# ifdef PROF
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# define PSEUDO_PROF \
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.set noat; \
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lda AT, _mcount; \
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jsr AT, (AT), _mcount; \
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.set at
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# else
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# define PSEUDO_PROF
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# endif
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.globl name; \
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.align 4; \
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.ent name, 0; \
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__LABEL(name) \
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ldgp gp, 0(pv); \
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.prologue 1; \
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PSEUDO_PROF; \
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SINGLE_THREAD_P(t0); \
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beq t0, $pseudo_cancel; \
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lda v0, SYS_ify(syscall_name); \
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call_pal PAL_callsys; \
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bne a3, $syscall_error; \
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__LABEL($pseudo_ret) \
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.subsection 2; \
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__LABEL($pseudo_cancel) \
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subq sp, 64, sp; \
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stq ra, 0(sp); \
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SAVE_ARGS_##args; \
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CENABLE; \
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LOAD_ARGS_##args; \
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lda v0, SYS_ify(syscall_name); \
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call_pal PAL_callsys; \
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stq v0, 8(sp); \
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stq a3, 16(sp); \
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CDISABLE; \
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ldq ra, 0(sp); \
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ldq v0, 8(sp); \
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ldq a3, 16(sp); \
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addq sp, 64, sp; \
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beq a3, $pseudo_ret; \
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__LABEL($syscall_error) \
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SYSCALL_ERROR_HANDLER; \
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END(name); \
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.previous
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# undef PSEUDO_END
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# define PSEUDO_END(sym)
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# define SAVE_ARGS_0 /* Nothing. */
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# define SAVE_ARGS_1 SAVE_ARGS_0; stq a0, 8(sp)
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# define SAVE_ARGS_2 SAVE_ARGS_1; stq a1, 16(sp)
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# define SAVE_ARGS_3 SAVE_ARGS_2; stq a2, 24(sp)
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# define SAVE_ARGS_4 SAVE_ARGS_3; stq a3, 32(sp)
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# define SAVE_ARGS_5 SAVE_ARGS_4; stq a4, 40(sp)
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# define SAVE_ARGS_6 SAVE_ARGS_5; stq a5, 48(sp)
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# define LOAD_ARGS_0 /* Nothing. */
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# define LOAD_ARGS_1 LOAD_ARGS_0; ldq a0, 8(sp)
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# define LOAD_ARGS_2 LOAD_ARGS_1; ldq a1, 16(sp)
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# define LOAD_ARGS_3 LOAD_ARGS_2; ldq a2, 24(sp)
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# define LOAD_ARGS_4 LOAD_ARGS_3; ldq a3, 32(sp)
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# define LOAD_ARGS_5 LOAD_ARGS_4; ldq a4, 40(sp)
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# define LOAD_ARGS_6 LOAD_ARGS_5; ldq a5, 48(sp)
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# ifdef IS_IN_libpthread
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# define __local_enable_asynccancel __pthread_enable_asynccancel
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# define __local_disable_asynccancel __pthread_disable_asynccancel
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# define __local_multiple_threads __pthread_multiple_threads
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# else
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# define __local_enable_asynccancel __libc_enable_asynccancel
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# define __local_disable_asynccancel __libc_disable_asynccancel
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# define __local_multiple_threads __libc_multiple_threads
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# endif
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# ifdef PIC
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# define CENABLE bsr ra, __local_enable_asynccancel !samegp
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# define CDISABLE bsr ra, __local_disable_asynccancel !samegp
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# else
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# define CENABLE jsr ra, __local_enable_asynccancel; ldgp ra, 0(gp)
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# define CDISABLE jsr ra, __local_disable_asynccancel; ldgp ra, 0(gp)
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# endif
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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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# elif defined(PIC)
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# define SINGLE_THREAD_P(reg) ldl reg, __local_multiple_threads(gp) !gprel
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# else
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# define SINGLE_THREAD_P(reg) \
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ldah reg, __local_multiple_threads(gp) !gprelhigh; \
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ldl reg, __local_multiple_threads(reg) !gprellow
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# endif
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#elif !defined __ASSEMBLER__
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/* This code should never be used but we define it anyhow. */
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# define SINGLE_THREAD_P (1)
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#endif
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