diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S | 58 |
1 files changed, 57 insertions, 1 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S index 4505e2cec6..72c3858238 100644 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002-2006, 2007 Free Software Foundation, Inc. +/* Copyright (C) 2002-2006, 2007, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -31,6 +31,8 @@ movl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg # define LOAD_FUTEX_WAIT(reg) \ xorl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg +# define LOAD_FUTEX_WAIT_ABS(reg) \ + xorl $(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME), reg # define LOAD_FUTEX_WAKE(reg) \ xorl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg #else @@ -55,6 +57,10 @@ andl %fs:PRIVATE_FUTEX, reg ; \ orl $FUTEX_WAIT, reg # endif +# define LOAD_FUTEX_WAIT_ABS(reg) \ + xorl $FUTEX_PRIVATE_FLAG, reg ; \ + andl %fs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME, reg # define LOAD_FUTEX_WAKE(reg) \ xorl $FUTEX_PRIVATE_FLAG, reg ; \ andl %fs:PRIVATE_FUTEX, reg ; \ @@ -143,12 +149,61 @@ __lll_lock_wait: cfi_endproc .size __lll_lock_wait,.-__lll_lock_wait + /* %rdi: futex + %rsi: flags + %rdx: timeout + %eax: futex value + */ .globl __lll_timedlock_wait .type __lll_timedlock_wait,@function .hidden __lll_timedlock_wait .align 16 __lll_timedlock_wait: cfi_startproc +# ifndef __ASSUME_FUTEX_CLOCK_REALTIME +# ifdef PIC + cmpl $0, __have_futex_clock_realtime(%rip) +# else + cmpl $0, __have_futex_clock_realtime +# endif + je .Lreltmo +# endif + + pushq %r9 + cfi_adjust_cfa_offset(9) + cfi_offset(%r9, -16) + movq %rdx, %r10 + movl $0xffffffff, %r9d + LOAD_FUTEX_WAIT_ABS (%esi) + + movl $2, %edx + cmpl %edx, %eax + jne 2f + +1: movl $SYS_futex, %eax + movl $2, %edx + syscall + +2: xchgl %edx, (%rdi) /* NB: lock is implied */ + + testl %edx, %edx + jz 3f + + cmpl $-ETIMEDOUT, %eax + je 4f + cmpl $-EINVAL, %eax + jne 1b +4: movl %eax, %edx + negl %edx + +3: movl %edx, %eax + popq %r9 + cfi_adjust_cfa_offset(-8) + cfi_restore(%r9) + retq + +# ifndef __ASSUME_FUTEX_CLOCK_REALTIME +.Lreltmo: /* Check for a valid timeout value. */ cmpq $1000000000, 8(%rdx) jae 3f @@ -253,6 +308,7 @@ __lll_timedlock_wait: 3: movl $EINVAL, %eax retq +# endif cfi_endproc .size __lll_timedlock_wait,.-__lll_timedlock_wait #endif |