diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h | 463 |
1 files changed, 0 insertions, 463 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h deleted file mode 100644 index 6903f92bd0..0000000000 --- a/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h +++ /dev/null @@ -1,463 +0,0 @@ -/* 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 !defined NOT_IN_libc || defined 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 defined NOT_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_robust_trylock(futex, id) \ - ({ int ret; \ - __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \ - : "=a" (ret), "=m" (futex) \ - : "r" (id), "m" (futex), \ - "0" (LLL_LOCK_INITIALIZER) \ - : "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 defined NOT_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 defined NOT_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_robust_dead(futex, private) \ - (void) \ - ({ int __ignore; \ - register int _nr asm ("edx") = 1; \ - __asm __volatile (LOCK_INSTR "orl %5, (%2)\n\t" \ - LLL_EBX_LOAD \ - LLL_ENTER_KERNEL \ - LLL_EBX_LOAD \ - : "=a" (__ignore) \ - : "0" (SYS_futex), LLL_EBX_REG (&(futex)), \ - "c" (__lll_private_flag (FUTEX_WAKE, private)), \ - "d" (_nr), "i" (FUTEX_OWNER_DIED), \ - "i" (offsetof (tcbhead_t, sysinfo))); \ - }) - -#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 */ |