diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S | 98 |
1 files changed, 79 insertions, 19 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S index 9c8a68f5b2..056b72900a 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc. +/* Copyright (C) 2002-2004, 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 %gs:PRIVATE_FUTEX, reg ; \ orl $FUTEX_WAIT, reg # endif +# define LOAD_FUTEX_WAIT_ABS(reg) \ + xorl $FUTEX_PRIVATE_FLAG, reg ; \ + andl %gs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAIT | FUTEX_CLOCK_REALTIME, reg # define LOAD_FUTEX_WAKE(reg) \ xorl $FUTEX_PRIVATE_FLAG, reg ; \ andl %gs:PRIVATE_FUTEX, reg ; \ @@ -154,28 +160,81 @@ __lll_lock_wait: cfi_endproc .size __lll_lock_wait,.-__lll_lock_wait + /* %ecx: futex + %esi: flags + %edx: timeout + %eax: futex value + */ .globl __lll_timedlock_wait .type __lll_timedlock_wait,@function .hidden __lll_timedlock_wait .align 16 __lll_timedlock_wait: cfi_startproc + pushl %ebp + cfi_adjust_cfa_offset(4) + cfi_rel_offset(%ebp, 0) + pushl %ebx + cfi_adjust_cfa_offset(4) + cfi_rel_offset(%ebx, 0) + +# ifndef __ASSUME_FUTEX_CLOCK_REALTIME +# ifdef PIC + LOAD_PIC_REG (bx) + cmpl $0, __have_futex_clock_realtime@GOTOFF(%ebx) +# else + cmpl $0, __have_futex_clock_realtime +# endif + je .Lreltmo +# endif + + movl %ecx, %ebx + movl %esi, %ecx + movl %edx, %esi + movl $0xffffffff, %ebp + LOAD_FUTEX_WAIT_ABS (%ecx) + + movl $2, %edx + cmpl %edx, %eax + jne 2f + +1: movl $SYS_futex, %eax + movl $2, %edx + ENTER_KERNEL + +2: xchgl %edx, (%ebx) /* 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 +7: popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + popl %ebp + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebp) + ret + +# ifndef __ASSUME_FUTEX_CLOCK_REALTIME +.Lreltmo: /* 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_rel_offset(%esi, 0) + pushl %edi cfi_adjust_cfa_offset(4) - cfi_offset(%edi, -8) - cfi_offset(%esi, -12) - cfi_offset(%ebx, -16) - cfi_offset(%ebp, -20) + cfi_rel_offset(%edi, 0) /* Stack frame for the timespec and timeval structs. */ subl $8, %esp @@ -236,23 +295,24 @@ __lll_timedlock_wait: 6: addl $8, %esp cfi_adjust_cfa_offset(-8) - popl %ebp - cfi_adjust_cfa_offset(-4) - cfi_restore(%ebp) - popl %ebx + popl %edi cfi_adjust_cfa_offset(-4) - cfi_restore(%ebx) + cfi_restore(%edi) popl %esi cfi_adjust_cfa_offset(-4) cfi_restore(%esi) - popl %edi +7: popl %ebx cfi_adjust_cfa_offset(-4) - cfi_restore(%edi) + cfi_restore(%ebx) + popl %ebp + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebp) movl %edx, %eax ret -3: movl $EINVAL, %eax - ret +3: movl $EINVAL, %edx + jmp 7b +# endif cfi_endproc .size __lll_timedlock_wait,.-__lll_timedlock_wait #endif |