diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/lowlevellock.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/lowlevellock.S | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/lowlevellock.S b/sysdeps/unix/sysv/linux/i386/lowlevellock.S new file mode 100644 index 0000000..94bb59b --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/lowlevellock.S @@ -0,0 +1,466 @@ +/* Copyright (C) 2002-2015 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <pthread-errnos.h> +#include <kernel-features.h> +#include <lowlevellock.h> + +#include <stap-probe.h> + + .text + +#ifdef __ASSUME_PRIVATE_FUTEX +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg +# define LOAD_PRIVATE_FUTEX_WAKE(reg) \ + 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 +# if FUTEX_WAIT == 0 +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl %gs:PRIVATE_FUTEX, reg +# else +# define LOAD_PRIVATE_FUTEX_WAIT(reg) \ + movl %gs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAIT, reg +# endif +# define LOAD_PRIVATE_FUTEX_WAKE(reg) \ + movl %gs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAKE, reg +# 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 +# define LOAD_FUTEX_WAIT_ABS(reg) \ + xorl $FUTEX_PRIVATE_FLAG, reg ; \ + andl %gs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME, reg +# define LOAD_FUTEX_WAKE(reg) \ + xorl $FUTEX_PRIVATE_FLAG, reg ; \ + andl %gs:PRIVATE_FUTEX, reg ; \ + orl $FUTEX_WAKE, reg +#endif + + .globl __lll_lock_wait_private + .type __lll_lock_wait_private,@function + .hidden __lll_lock_wait_private + .align 16 +__lll_lock_wait_private: + 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 $2, %edx + movl %ecx, %ebx + xorl %esi, %esi /* No timeout. */ + LOAD_PRIVATE_FUTEX_WAIT (%ecx) + + cmpl %edx, %eax /* NB: %edx == 2 */ + jne 2f + +1: LIBC_PROBE (lll_lock_wait_private, 1, %ebx) + movl $SYS_futex, %eax + ENTER_KERNEL + +2: movl %edx, %eax + xchgl %eax, (%ebx) /* NB: lock is implied */ + + testl %eax, %eax + jnz 1b + + 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_lock_wait_private,.-__lll_lock_wait_private + +#if !IS_IN (libc) + .globl __lll_lock_wait + .type __lll_lock_wait,@function + .hidden __lll_lock_wait + .align 16 +__lll_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 + movl $2, %edx + xorl %esi, %esi /* No timeout. */ + LOAD_FUTEX_WAIT (%ecx) + + cmpl %edx, %eax /* NB: %edx == 2 */ + jne 2f + +1: movl $SYS_futex, %eax + ENTER_KERNEL + +2: movl %edx, %eax + xchgl %eax, (%ebx) /* NB: lock is implied */ + + testl %eax, %eax + jnz 1b + + 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_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 + + cmpl $0, (%edx) + js 8f + + 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 + +8: movl $ETIMEDOUT, %eax + jmp 7b + +# ifndef __ASSUME_FUTEX_CLOCK_REALTIME +.Lreltmo: + /* Check for a valid timeout value. */ + cmpl $1000000000, 4(%edx) + jae 3f + + pushl %esi + cfi_adjust_cfa_offset(4) + cfi_rel_offset(%esi, 0) + pushl %edi + cfi_adjust_cfa_offset(4) + cfi_rel_offset(%edi, 0) + + /* Stack frame for the timespec and timeval structs. */ + subl $8, %esp + cfi_adjust_cfa_offset(8) + + movl %ecx, %ebp + movl %edx, %edi + + movl $2, %edx + xchgl %edx, (%ebp) + + test %edx, %edx + je 6f + +1: + /* 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 2f /* Time is already up. */ + + /* Store relative timeout. */ + movl %ecx, (%esp) + movl %edx, 4(%esp) + + /* Futex call. */ + movl %ebp, %ebx + movl $2, %edx + movl %esp, %esi + movl 16(%esp), %ecx + LOAD_FUTEX_WAIT (%ecx) + movl $SYS_futex, %eax + ENTER_KERNEL + + /* NB: %edx == 2 */ + xchgl %edx, (%ebp) + + testl %edx, %edx + je 6f + + cmpl $-ETIMEDOUT, %eax + jne 1b +2: movl $ETIMEDOUT, %edx + +6: addl $8, %esp + cfi_adjust_cfa_offset(-8) + popl %edi + cfi_adjust_cfa_offset(-4) + cfi_restore(%edi) + popl %esi + cfi_adjust_cfa_offset(-4) + cfi_restore(%esi) +7: popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + popl %ebp + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebp) + movl %edx, %eax + ret + +3: movl $EINVAL, %edx + jmp 7b +# endif + cfi_endproc + .size __lll_timedlock_wait,.-__lll_timedlock_wait +#endif + + .globl __lll_unlock_wake_private + .type __lll_unlock_wake_private,@function + .hidden __lll_unlock_wake_private + .align 16 +__lll_unlock_wake_private: + cfi_startproc + pushl %ebx + cfi_adjust_cfa_offset(4) + pushl %ecx + cfi_adjust_cfa_offset(4) + pushl %edx + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) + cfi_offset(%ecx, -12) + cfi_offset(%edx, -16) + + movl %eax, %ebx + movl $0, (%eax) + LOAD_PRIVATE_FUTEX_WAKE (%ecx) + movl $1, %edx /* Wake one thread. */ + movl $SYS_futex, %eax + ENTER_KERNEL + + popl %edx + cfi_adjust_cfa_offset(-4) + cfi_restore(%edx) + popl %ecx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ecx) + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + cfi_endproc + .size __lll_unlock_wake_private,.-__lll_unlock_wake_private + +#if !IS_IN (libc) + .globl __lll_unlock_wake + .type __lll_unlock_wake,@function + .hidden __lll_unlock_wake + .align 16 +__lll_unlock_wake: + cfi_startproc + pushl %ebx + cfi_adjust_cfa_offset(4) + pushl %ecx + cfi_adjust_cfa_offset(4) + pushl %edx + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) + cfi_offset(%ecx, -12) + cfi_offset(%edx, -16) + + movl %eax, %ebx + movl $0, (%eax) + LOAD_FUTEX_WAKE (%ecx) + movl $1, %edx /* Wake one thread. */ + movl $SYS_futex, %eax + ENTER_KERNEL + + popl %edx + cfi_adjust_cfa_offset(-4) + cfi_restore(%edx) + popl %ecx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ecx) + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + cfi_endproc + .size __lll_unlock_wake,.-__lll_unlock_wake + + .globl __lll_timedwait_tid + .type __lll_timedwait_tid,@function + .hidden __lll_timedwait_tid + .align 16 +__lll_timedwait_tid: + pushl %edi + pushl %esi + pushl %ebx + pushl %ebp + + movl %eax, %ebp + movl %edx, %edi + subl $8, %esp + + /* Get current time. */ +2: 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 5f + addl $1000000000, %edx + subl $1, %ecx +5: testl %ecx, %ecx + js 6f /* Time is already up. */ + + movl %ecx, (%esp) /* Store relative timeout. */ + movl %edx, 4(%esp) + + movl (%ebp), %edx + testl %edx, %edx + jz 4f + + movl %esp, %esi + /* XXX The kernel so far uses global futex for the wakeup at + all times. */ + xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ + movl %ebp, %ebx + movl $SYS_futex, %eax + ENTER_KERNEL + + cmpl $0, (%ebx) + jne 1f +4: xorl %eax, %eax + +3: addl $8, %esp + popl %ebp + popl %ebx + popl %esi + popl %edi + ret + +1: cmpl $-ETIMEDOUT, %eax + jne 2b +6: movl $ETIMEDOUT, %eax + jmp 3b + .size __lll_timedwait_tid,.-__lll_timedwait_tid +#endif |