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/* Copyright (C) 2002-2014 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/>. */
#ifndef _LOWLEVELLOCK_H
#define _LOWLEVELLOCK_H 1
#include <stap-probe.h>
#ifndef __ASSEMBLER__
# include <time.h>
# include <sys/param.h>
# include <bits/pthreadtypes.h>
# include <kernel-features.h>
# include <tcb-offsets.h>
# ifndef LOCK_INSTR
# ifdef UP
# define LOCK_INSTR /* nothing */
# else
# define LOCK_INSTR "lock;"
# endif
# endif
#else
# ifndef LOCK
# ifdef UP
# define LOCK
# else
# define LOCK lock
# endif
# endif
#endif
#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_CMP_REQUEUE 4
#define FUTEX_WAKE_OP 5
#define FUTEX_LOCK_PI 6
#define FUTEX_UNLOCK_PI 7
#define FUTEX_TRYLOCK_PI 8
#define FUTEX_WAIT_BITSET 9
#define FUTEX_WAKE_BITSET 10
#define FUTEX_WAIT_REQUEUE_PI 11
#define FUTEX_CMP_REQUEUE_PI 12
#define FUTEX_PRIVATE_FLAG 128
#define FUTEX_CLOCK_REALTIME 256
#define FUTEX_BITSET_MATCH_ANY 0xffffffff
#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
/* Values for 'private' parameter of locking macros. Yes, the
definition seems to be backwards. But it is not. The bit will be
reversed before passing to the system call. */
#define LLL_PRIVATE 0
#define LLL_SHARED FUTEX_PRIVATE_FLAG
#if IS_IN (libc) || IS_IN (rtld)
/* In libc.so or ld.so all futexes are private. */
# ifdef __ASSUME_PRIVATE_FUTEX
# define __lll_private_flag(fl, private) \
((fl) | FUTEX_PRIVATE_FLAG)
# else
# define __lll_private_flag(fl, private) \
((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
# endif
#else
# ifdef __ASSUME_PRIVATE_FUTEX
# define __lll_private_flag(fl, private) \
(((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
# else
# define __lll_private_flag(fl, private) \
(__builtin_constant_p (private) \
? ((private) == 0 \
? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
: (fl)) \
: ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \
asm ("andl %%gs:%P1, %0" : "+r" (__fl) \
: "i" (offsetof (struct pthread, header.private_futex))); \
__fl | (fl); }))
# endif
#endif
#ifndef __ASSEMBLER__
/* Initializer for compatibility lock. */
#define LLL_LOCK_INITIALIZER (0)
#define LLL_LOCK_INITIALIZER_LOCKED (1)
#define LLL_LOCK_INITIALIZER_WAITERS (2)
#ifdef PIC
# define LLL_EBX_LOAD "xchgl %2, %%ebx\n"
# define LLL_EBX_REG "D"
#else
# define LLL_EBX_LOAD
# define LLL_EBX_REG "b"
#endif
#ifdef I386_USE_SYSENTER
# ifdef SHARED
# define LLL_ENTER_KERNEL "call *%%gs:%P6\n\t"
# else
# define LLL_ENTER_KERNEL "call *_dl_sysinfo\n\t"
# endif
#else
# define LLL_ENTER_KERNEL "int $0x80\n\t"
#endif
/* Delay in spinlock loop. */
#define BUSY_WAIT_NOP asm ("rep; nop")
#define lll_futex_wait(futex, val, private) \
lll_futex_timed_wait (futex, val, NULL, private)
#define lll_futex_timed_wait(futex, val, timeout, private) \
({ \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
: "=a" (__status) \
: "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout), \
"c" (__lll_private_flag (FUTEX_WAIT, private)), \
"d" (_val), "i" (offsetof (tcbhead_t, sysinfo)) \
: "memory"); \
__status; \
})
#define lll_futex_wake(futex, nr, private) \
({ \
int __status; \
register __typeof (nr) _nr asm ("edx") = (nr); \
LIBC_PROBE (lll_futex_wake, 3, futex, nr, private); \
__asm __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
: "=a" (__status) \
: "0" (SYS_futex), LLL_EBX_REG (futex), \
"c" (__lll_private_flag (FUTEX_WAKE, private)), \
"d" (_nr), \
"i" (0) /* phony, to align next arg's number */, \
"i" (offsetof (tcbhead_t, sysinfo))); \
__status; \
})
/* NB: in the lll_trylock macro we simply return the value in %eax
after the cmpxchg instruction. In case the operation succeded this
value is zero. In case the operation failed, the cmpxchg instruction
has loaded the current value of the memory work which is guaranteed
to be nonzero. */
#if !IS_IN (libc) || defined UP
# define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1"
#else
# define __lll_trylock_asm "cmpl $0, %%gs:%P5\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %2, %1"
#endif
#define lll_trylock(futex) \
({ int ret; \
__asm __volatile (__lll_trylock_asm \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex), \
"0" (LLL_LOCK_INITIALIZER), \
"i" (MULTIPLE_THREADS_OFFSET) \
: "memory"); \
ret; })
#define lll_cond_trylock(futex) \
({ int ret; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_LOCK_INITIALIZER_WAITERS), \
"m" (futex), "0" (LLL_LOCK_INITIALIZER) \
: "memory"); \
ret; })
#if !IS_IN (libc) || defined UP
# define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %1, %2\n\t"
#else
# define __lll_lock_asm_start "cmpl $0, %%gs:%P6\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %1, %2\n\t"
#endif
#define lll_lock(futex, private) \
(void) \
({ int ignore1, ignore2; \
if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
__asm __volatile (__lll_lock_asm_start \
"jz 18f\n\t" \
"1:\tleal %2, %%ecx\n" \
"2:\tcall __lll_lock_wait_private\n" \
"18:" \
: "=a" (ignore1), "=c" (ignore2), "=m" (futex) \
: "0" (0), "1" (1), "m" (futex), \
"i" (MULTIPLE_THREADS_OFFSET) \
: "memory"); \
else \
{ \
int ignore3; \
__asm __volatile (__lll_lock_asm_start \
"jz 18f\n\t" \
"1:\tleal %2, %%edx\n" \
"0:\tmovl %8, %%ecx\n" \
"2:\tcall __lll_lock_wait\n" \
"18:" \
: "=a" (ignore1), "=c" (ignore2), \
"=m" (futex), "=&d" (ignore3) \
: "1" (1), "m" (futex), \
"i" (MULTIPLE_THREADS_OFFSET), "0" (0), \
"g" ((int) (private)) \
: "memory"); \
} \
})
#define lll_robust_lock(futex, id, private) \
({ int result, ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
"jz 18f\n\t" \
"1:\tleal %2, %%edx\n" \
"0:\tmovl %7, %%ecx\n" \
"2:\tcall __lll_robust_lock_wait\n" \
"18:" \
: "=a" (result), "=c" (ignore1), "=m" (futex), \
"=&d" (ignore2) \
: "0" (0), "1" (id), "m" (futex), "g" ((int) (private))\
: "memory"); \
result; })
/* Special version of lll_lock which causes the unlock function to
always wakeup waiters. */
#define lll_cond_lock(futex, private) \
(void) \
({ int ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
"jz 18f\n\t" \
"1:\tleal %2, %%edx\n" \
"0:\tmovl %7, %%ecx\n" \
"2:\tcall __lll_lock_wait\n" \
"18:" \
: "=a" (ignore1), "=c" (ignore2), "=m" (futex), \
"=&d" (ignore3) \
: "0" (0), "1" (2), "m" (futex), "g" ((int) (private))\
: "memory"); \
})
#define lll_robust_cond_lock(futex, id, private) \
({ int result, ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
"jz 18f\n\t" \
"1:\tleal %2, %%edx\n" \
"0:\tmovl %7, %%ecx\n" \
"2:\tcall __lll_robust_lock_wait\n" \
"18:" \
: "=a" (result), "=c" (ignore1), "=m" (futex), \
"=&d" (ignore2) \
: "0" (0), "1" (id | FUTEX_WAITERS), "m" (futex), \
"g" ((int) (private)) \
: "memory"); \
result; })
#define lll_timedlock(futex, timeout, private) \
({ int result, ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
"jz 18f\n\t" \
"1:\tleal %3, %%ecx\n" \
"0:\tmovl %8, %%edx\n" \
"2:\tcall __lll_timedlock_wait\n" \
"18:" \
: "=a" (result), "=c" (ignore1), "=&d" (ignore2), \
"=m" (futex), "=S" (ignore3) \
: "0" (0), "1" (1), "m" (futex), "m" (timeout), \
"4" ((int) (private)) \
: "memory"); \
result; })
extern int __lll_timedlock_elision (int *futex, short *adapt_count,
const struct timespec *timeout,
int private) attribute_hidden;
#define lll_timedlock_elision(futex, adapt_count, timeout, private) \
__lll_timedlock_elision(&(futex), &(adapt_count), timeout, private)
#define lll_robust_timedlock(futex, timeout, id, private) \
({ int result, ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
"jz 18f\n\t" \
"1:\tleal %3, %%ecx\n" \
"0:\tmovl %8, %%edx\n" \
"2:\tcall __lll_robust_timedlock_wait\n" \
"18:" \
: "=a" (result), "=c" (ignore1), "=&d" (ignore2), \
"=m" (futex), "=S" (ignore3) \
: "0" (0), "1" (id), "m" (futex), "m" (timeout), \
"4" ((int) (private)) \
: "memory"); \
result; })
#if !IS_IN (libc) || defined UP
# define __lll_unlock_asm LOCK_INSTR "subl $1, %0\n\t"
#else
# define __lll_unlock_asm "cmpl $0, %%gs:%P3\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tsubl $1,%0\n\t"
#endif
#define lll_unlock(futex, private) \
(void) \
({ int ignore; \
if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
__asm __volatile (__lll_unlock_asm \
"je 18f\n\t" \
"1:\tleal %0, %%eax\n" \
"2:\tcall __lll_unlock_wake_private\n" \
"18:" \
: "=m" (futex), "=&a" (ignore) \
: "m" (futex), "i" (MULTIPLE_THREADS_OFFSET) \
: "memory"); \
else \
{ \
int ignore2; \
__asm __volatile (__lll_unlock_asm \
"je 18f\n\t" \
"1:\tleal %0, %%eax\n" \
"0:\tmovl %5, %%ecx\n" \
"2:\tcall __lll_unlock_wake\n" \
"18:" \
: "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \
: "i" (MULTIPLE_THREADS_OFFSET), "m" (futex), \
"g" ((int) (private)) \
: "memory"); \
} \
})
#define lll_robust_unlock(futex, private) \
(void) \
({ int ignore, ignore2; \
__asm __volatile (LOCK_INSTR "andl %3, %0\n\t" \
"je 18f\n\t" \
"1:\tleal %0, %%eax\n" \
"0:\tmovl %5, %%ecx\n" \
"2:\tcall __lll_unlock_wake\n" \
"18:" \
: "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \
: "i" (FUTEX_WAITERS), "m" (futex), \
"g" ((int) (private)) \
: "memory"); \
})
#define lll_islocked(futex) \
(futex != LLL_LOCK_INITIALIZER)
/* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex
wakeup when the clone terminates. The memory location contains the
thread ID while the clone is running and is reset to zero
afterwards.
The macro parameter must not have any side effect. */
#define lll_wait_tid(tid) \
do { \
int __ignore; \
register __typeof (tid) _tid asm ("edx") = (tid); \
if (_tid != 0) \
__asm __volatile (LLL_EBX_LOAD \
"1:\tmovl %1, %%eax\n\t" \
LLL_ENTER_KERNEL \
"cmpl $0, (%%ebx)\n\t" \
"jne 1b\n\t" \
LLL_EBX_LOAD \
: "=&a" (__ignore) \
: "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0), \
"c" (FUTEX_WAIT), "d" (_tid), \
"i" (offsetof (tcbhead_t, sysinfo)) \
: "memory"); \
} while (0)
extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
__attribute__ ((regparm (2))) attribute_hidden;
#define lll_timedwait_tid(tid, abstime) \
({ \
int __result = 0; \
if (tid != 0) \
{ \
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
__result = EINVAL; \
else \
__result = __lll_timedwait_tid (&tid, abstime); \
} \
__result; })
extern int __lll_lock_elision (int *futex, short *adapt_count, int private)
attribute_hidden;
extern int __lll_unlock_elision(int *lock, int private)
attribute_hidden;
extern int __lll_trylock_elision(int *lock, short *adapt_count)
attribute_hidden;
#define lll_lock_elision(futex, adapt_count, private) \
__lll_lock_elision (&(futex), &(adapt_count), private)
#define lll_unlock_elision(futex, private) \
__lll_unlock_elision (&(futex), private)
#define lll_trylock_elision(futex, adapt_count) \
__lll_trylock_elision(&(futex), &(adapt_count))
#endif /* !__ASSEMBLER__ */
#endif /* lowlevellock.h */
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