| /* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| #include <pthread-errnos.h> |
| #include <lowlevellock.h> |
| #include <lowlevelrobustlock.h> |
| #include <kernel-features.h> |
| |
| .text |
| |
| #define FUTEX_WAITERS 0x80000000 |
| #define FUTEX_OWNER_DIED 0x40000000 |
| |
| #ifdef __ASSUME_PRIVATE_FUTEX |
| # define LOAD_FUTEX_WAIT(reg) \ |
| xorl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg |
| #else |
| # if FUTEX_WAIT == 0 |
| # define LOAD_FUTEX_WAIT(reg) \ |
| xorl $FUTEX_PRIVATE_FLAG, reg ; \ |
| andl %gs:PRIVATE_FUTEX, reg |
| # else |
| # define LOAD_FUTEX_WAIT(reg) \ |
| xorl $FUTEX_PRIVATE_FLAG, reg ; \ |
| andl %gs:PRIVATE_FUTEX, reg ; \ |
| orl $FUTEX_WAIT, reg |
| # endif |
| #endif |
| |
| .globl __lll_robust_lock_wait |
| .type __lll_robust_lock_wait,@function |
| .hidden __lll_robust_lock_wait |
| .align 16 |
| __lll_robust_lock_wait: |
| cfi_startproc |
| pushl %edx |
| cfi_adjust_cfa_offset(4) |
| pushl %ebx |
| cfi_adjust_cfa_offset(4) |
| pushl %esi |
| cfi_adjust_cfa_offset(4) |
| cfi_offset(%edx, -8) |
| cfi_offset(%ebx, -12) |
| cfi_offset(%esi, -16) |
| |
| movl %edx, %ebx |
| xorl %esi, %esi /* No timeout. */ |
| LOAD_FUTEX_WAIT (%ecx) |
| |
| 4: movl %eax, %edx |
| orl $FUTEX_WAITERS, %edx |
| |
| testl $FUTEX_OWNER_DIED, %eax |
| jnz 3f |
| |
| cmpl %edx, %eax /* NB: %edx == 2 */ |
| je 1f |
| |
| LOCK |
| cmpxchgl %edx, (%ebx) |
| jnz 2f |
| |
| 1: movl $SYS_futex, %eax |
| ENTER_KERNEL |
| |
| movl (%ebx), %eax |
| |
| 2: test %eax, %eax |
| jne 4b |
| |
| movl %gs:TID, %edx |
| orl $FUTEX_WAITERS, %edx |
| LOCK |
| cmpxchgl %edx, (%ebx) |
| jnz 4b |
| /* NB: %eax == 0 */ |
| |
| 3: popl %esi |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%esi) |
| popl %ebx |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%ebx) |
| popl %edx |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%edx) |
| ret |
| cfi_endproc |
| .size __lll_robust_lock_wait,.-__lll_robust_lock_wait |
| |
| |
| .globl __lll_robust_timedlock_wait |
| .type __lll_robust_timedlock_wait,@function |
| .hidden __lll_robust_timedlock_wait |
| .align 16 |
| __lll_robust_timedlock_wait: |
| cfi_startproc |
| /* Check for a valid timeout value. */ |
| cmpl $1000000000, 4(%edx) |
| jae 3f |
| |
| pushl %edi |
| cfi_adjust_cfa_offset(4) |
| pushl %esi |
| cfi_adjust_cfa_offset(4) |
| pushl %ebx |
| cfi_adjust_cfa_offset(4) |
| pushl %ebp |
| cfi_adjust_cfa_offset(4) |
| cfi_offset(%edi, -8) |
| cfi_offset(%esi, -12) |
| cfi_offset(%ebx, -16) |
| cfi_offset(%ebp, -20) |
| |
| /* Stack frame for the timespec and timeval structs. */ |
| subl $12, %esp |
| cfi_adjust_cfa_offset(12) |
| |
| movl %ecx, %ebp |
| movl %edx, %edi |
| |
| 1: movl %eax, 8(%esp) |
| |
| /* Get current time. */ |
| movl %esp, %ebx |
| xorl %ecx, %ecx |
| movl $__NR_gettimeofday, %eax |
| ENTER_KERNEL |
| |
| /* Compute relative timeout. */ |
| movl 4(%esp), %eax |
| movl $1000, %edx |
| mul %edx /* Milli seconds to nano seconds. */ |
| movl (%edi), %ecx |
| movl 4(%edi), %edx |
| subl (%esp), %ecx |
| subl %eax, %edx |
| jns 4f |
| addl $1000000000, %edx |
| subl $1, %ecx |
| 4: testl %ecx, %ecx |
| js 8f /* Time is already up. */ |
| |
| /* Store relative timeout. */ |
| movl %ecx, (%esp) |
| movl %edx, 4(%esp) |
| |
| movl %ebp, %ebx |
| |
| movl 8(%esp), %edx |
| movl %edx, %eax |
| orl $FUTEX_WAITERS, %edx |
| |
| testl $FUTEX_OWNER_DIED, %eax |
| jnz 6f |
| |
| cmpl %eax, %edx |
| je 2f |
| |
| LOCK |
| cmpxchgl %edx, (%ebx) |
| movl $0, %ecx /* Must use mov to avoid changing cc. */ |
| jnz 5f |
| |
| 2: |
| /* Futex call. */ |
| movl %esp, %esi |
| movl 20(%esp), %ecx |
| LOAD_FUTEX_WAIT (%ecx) |
| movl $SYS_futex, %eax |
| ENTER_KERNEL |
| movl %eax, %ecx |
| |
| movl (%ebx), %eax |
| |
| 5: testl %eax, %eax |
| jne 7f |
| |
| movl %gs:TID, %edx |
| orl $FUTEX_WAITERS, %edx |
| LOCK |
| cmpxchgl %edx, (%ebx) |
| jnz 7f |
| |
| 6: addl $12, %esp |
| cfi_adjust_cfa_offset(-12) |
| popl %ebp |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%ebp) |
| popl %ebx |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%ebx) |
| popl %esi |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%esi) |
| popl %edi |
| cfi_adjust_cfa_offset(-4) |
| cfi_restore(%edi) |
| ret |
| |
| 3: movl $EINVAL, %eax |
| ret |
| |
| cfi_adjust_cfa_offset(28) |
| cfi_offset(%edi, -8) |
| cfi_offset(%esi, -12) |
| cfi_offset(%ebx, -16) |
| cfi_offset(%ebp, -20) |
| /* Check whether the time expired. */ |
| 7: cmpl $-ETIMEDOUT, %ecx |
| jne 1b |
| |
| 8: movl $ETIMEDOUT, %eax |
| jmp 6b |
| cfi_endproc |
| .size __lll_robust_timedlock_wait,.-__lll_robust_timedlock_wait |
