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https://sourceware.org/git/glibc.git
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217 lines
4.8 KiB
ArmAsm
217 lines
4.8 KiB
ArmAsm
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@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 <shlib-compat.h>
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#include <lowlevellock.h>
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#include <lowlevelcond.h>
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#include <kernel-features.h>
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#include <pthread-pi-defines.h>
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#include <pthread-errnos.h>
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#include <stap-probe.h>
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.text
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/* int pthread_cond_signal (pthread_cond_t *cond) */
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.globl __pthread_cond_signal
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.type __pthread_cond_signal, @function
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.align 16
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__pthread_cond_signal:
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cfi_startproc
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pushl %ebx
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset(%ebx, 0)
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pushl %edi
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset(%edi, 0)
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cfi_remember_state
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movl 12(%esp), %edi
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LIBC_PROBE (cond_signal, 1, %edi)
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/* Get internal lock. */
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movl $1, %edx
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xorl %eax, %eax
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LOCK
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#if cond_lock == 0
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cmpxchgl %edx, (%edi)
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#else
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cmpxchgl %edx, cond_lock(%edi)
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#endif
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jnz 1f
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2: leal cond_futex(%edi), %ebx
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movl total_seq+4(%edi), %eax
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movl total_seq(%edi), %ecx
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cmpl wakeup_seq+4(%edi), %eax
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#if cond_lock != 0
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/* Must use leal to preserve the flags. */
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leal cond_lock(%edi), %edi
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#endif
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ja 3f
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jb 4f
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cmpl wakeup_seq-cond_futex(%ebx), %ecx
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jbe 4f
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/* Bump the wakeup number. */
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3: addl $1, wakeup_seq-cond_futex(%ebx)
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adcl $0, wakeup_seq-cond_futex+4(%ebx)
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addl $1, (%ebx)
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/* Wake up one thread. */
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pushl %esi
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset(%esi, 0)
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pushl %ebp
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset(%ebp, 0)
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#if FUTEX_PRIVATE_FLAG > 255
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xorl %ecx, %ecx
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#endif
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cmpl $-1, dep_mutex-cond_futex(%ebx)
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sete %cl
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je 8f
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movl dep_mutex-cond_futex(%ebx), %edx
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/* Requeue to a non-robust PI mutex if the PI bit is set and
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the robust bit is not set. */
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movl MUTEX_KIND(%edx), %eax
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andl $(ROBUST_BIT|PI_BIT), %eax
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cmpl $PI_BIT, %eax
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je 9f
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8: subl $1, %ecx
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#ifdef __ASSUME_PRIVATE_FUTEX
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andl $FUTEX_PRIVATE_FLAG, %ecx
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#else
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andl %gs:PRIVATE_FUTEX, %ecx
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#endif
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addl $FUTEX_WAKE_OP, %ecx
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movl $SYS_futex, %eax
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movl $1, %edx
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movl $1, %esi
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movl $FUTEX_OP_CLEAR_WAKE_IF_GT_ONE, %ebp
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/* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for
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sysenter.
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ENTER_KERNEL */
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int $0x80
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popl %ebp
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%ebp)
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popl %esi
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%esi)
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/* For any kind of error, we try again with WAKE.
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The general test also covers running on old kernels. */
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cmpl $-4095, %eax
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jae 7f
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6: xorl %eax, %eax
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popl %edi
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%edi)
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popl %ebx
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%ebx)
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ret
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cfi_restore_state
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9: movl $(FUTEX_CMP_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %ecx
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movl $SYS_futex, %eax
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movl $1, %edx
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xorl %esi, %esi
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movl dep_mutex-cond_futex(%ebx), %edi
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movl (%ebx), %ebp
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/* FIXME: Until Ingo fixes 4G/4G vDSO, 6 arg syscalls are broken for
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sysenter.
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ENTER_KERNEL */
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int $0x80
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popl %ebp
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popl %esi
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leal -cond_futex(%ebx), %edi
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/* For any kind of error, we try again with WAKE.
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The general test also covers running on old kernels. */
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cmpl $-4095, %eax
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jb 4f
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7:
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#ifdef __ASSUME_PRIVATE_FUTEX
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andl $FUTEX_PRIVATE_FLAG, %ecx
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#else
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andl %gs:PRIVATE_FUTEX, %ecx
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#endif
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orl $FUTEX_WAKE, %ecx
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movl $SYS_futex, %eax
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/* %edx should be 1 already from $FUTEX_WAKE_OP syscall.
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movl $1, %edx */
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ENTER_KERNEL
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/* Unlock. Note that at this point %edi always points to
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cond_lock. */
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4: LOCK
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subl $1, (%edi)
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je 6b
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/* Unlock in loop requires wakeup. */
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5: movl %edi, %eax
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#if (LLL_SHARED-LLL_PRIVATE) > 255
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xorl %ecx, %ecx
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#endif
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cmpl $-1, dep_mutex-cond_futex(%ebx)
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setne %cl
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subl $1, %ecx
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andl $(LLL_SHARED-LLL_PRIVATE), %ecx
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#if LLL_PRIVATE != 0
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addl $LLL_PRIVATE, %ecx
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#endif
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call __lll_unlock_wake
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jmp 6b
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/* Initial locking failed. */
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1:
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#if cond_lock == 0
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movl %edi, %edx
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#else
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leal cond_lock(%edi), %edx
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#endif
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#if (LLL_SHARED-LLL_PRIVATE) > 255
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xorl %ecx, %ecx
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#endif
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cmpl $-1, dep_mutex(%edi)
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setne %cl
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subl $1, %ecx
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andl $(LLL_SHARED-LLL_PRIVATE), %ecx
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#if LLL_PRIVATE != 0
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addl $LLL_PRIVATE, %ecx
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#endif
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call __lll_lock_wait
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jmp 2b
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cfi_endproc
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.size __pthread_cond_signal, .-__pthread_cond_signal
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versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
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GLIBC_2_3_2)
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