diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h | 476 |
1 files changed, 0 insertions, 476 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h deleted file mode 100644 index c13ca084df..0000000000 --- a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h +++ /dev/null @@ -1,476 +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 __NR_futex -#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 - -#ifndef __ASSEMBLER__ - -#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 %%fs:%P1, %0" : "+r" (__fl) \ - : "i" (offsetof (struct pthread, header.private_futex))); \ - __fl | (fl); })) -# endif -#endif - -/* Initializer for lock. */ -#define LLL_LOCK_INITIALIZER (0) -#define LLL_LOCK_INITIALIZER_LOCKED (1) -#define LLL_LOCK_INITIALIZER_WAITERS (2) - -/* 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) \ - ({ \ - register const struct timespec *__to __asm ("r10") = timeout; \ - int __status; \ - register __typeof (val) _val __asm ("edx") = (val); \ - __asm __volatile ("syscall" \ - : "=a" (__status) \ - : "0" (SYS_futex), "D" (futex), \ - "S" (__lll_private_flag (FUTEX_WAIT, private)), \ - "d" (_val), "r" (__to) \ - : "memory", "cc", "r11", "cx"); \ - __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 ("syscall" \ - : "=a" (__status) \ - : "0" (SYS_futex), "D" (futex), \ - "S" (__lll_private_flag (FUTEX_WAKE, private)), \ - "d" (_nr) \ - : "memory", "cc", "r10", "r11", "cx"); \ - __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, __libc_multiple_threads(%%rip)\n\t" \ - "je 0f\n\t" \ - "lock; cmpxchgl %2, %1\n\t" \ - "jmp 1f\n\t" \ - "0:\tcmpxchgl %2, %1\n\t" \ - "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) \ - : "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 %4, %2\n\t" \ - "jz 24f\n\t" -#else -# define __lll_lock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \ - "je 0f\n\t" \ - "lock; cmpxchgl %4, %2\n\t" \ - "jnz 1f\n\t" \ - "jmp 24f\n" \ - "0:\tcmpxchgl %4, %2\n\t" \ - "jz 24f\n\t" -#endif - -#define lll_lock(futex, private) \ - (void) \ - ({ int ignore1, ignore2, ignore3; \ - if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ - __asm __volatile (__lll_lock_asm_start \ - "1:\tlea %2, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_lock_wait_private\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \ - "=a" (ignore3) \ - : "0" (1), "m" (futex), "3" (0) \ - : "cx", "r11", "cc", "memory"); \ - else \ - __asm __volatile (__lll_lock_asm_start \ - "1:\tlea %2, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_lock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ - "=a" (ignore3) \ - : "1" (1), "m" (futex), "3" (0), "0" (private) \ - : "cx", "r11", "cc", "memory"); \ - }) \ - -#define lll_robust_lock(futex, id, private) \ - ({ int result, ignore1, ignore2; \ - __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ - "jz 24f\n" \ - "1:\tlea %2, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_robust_lock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ - "=a" (result) \ - : "1" (id), "m" (futex), "3" (0), "0" (private) \ - : "cx", "r11", "cc", "memory"); \ - result; }) - -#define lll_cond_lock(futex, private) \ - (void) \ - ({ int ignore1, ignore2, ignore3; \ - __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ - "jz 24f\n" \ - "1:\tlea %2, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_lock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ - "=a" (ignore3) \ - : "1" (2), "m" (futex), "3" (0), "0" (private) \ - : "cx", "r11", "cc", "memory"); \ - }) - -#define lll_robust_cond_lock(futex, id, private) \ - ({ int result, ignore1, ignore2; \ - __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ - "jz 24f\n" \ - "1:\tlea %2, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_robust_lock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ - "=a" (result) \ - : "1" (id | FUTEX_WAITERS), "m" (futex), "3" (0), \ - "0" (private) \ - : "cx", "r11", "cc", "memory"); \ - result; }) - -#define lll_timedlock(futex, timeout, private) \ - ({ int result, ignore1, ignore2, ignore3; \ - __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t" \ - "jz 24f\n" \ - "1:\tlea %4, %%" RDI_LP "\n" \ - "0:\tmov %8, %%" RDX_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_timedlock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=a" (result), "=D" (ignore1), "=S" (ignore2), \ - "=&d" (ignore3), "=m" (futex) \ - : "0" (0), "1" (1), "m" (futex), "m" (timeout), \ - "2" (private) \ - : "memory", "cx", "cc", "r10", "r11"); \ - 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, %4\n\t" \ - "jz 24f\n\t" \ - "1:\tlea %4, %%" RDI_LP "\n" \ - "0:\tmov %8, %%" RDX_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_robust_timedlock_wait\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=a" (result), "=D" (ignore1), "=S" (ignore2), \ - "=&d" (ignore3), "=m" (futex) \ - : "0" (0), "1" (id), "m" (futex), "m" (timeout), \ - "2" (private) \ - : "memory", "cx", "cc", "r10", "r11"); \ - result; }) - -#if defined NOT_IN_libc || defined UP -# define __lll_unlock_asm_start LOCK_INSTR "decl %0\n\t" \ - "je 24f\n\t" -#else -# define __lll_unlock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \ - "je 0f\n\t" \ - "lock; decl %0\n\t" \ - "jne 1f\n\t" \ - "jmp 24f\n\t" \ - "0:\tdecl %0\n\t" \ - "je 24f\n\t" -#endif - -#define lll_unlock(futex, private) \ - (void) \ - ({ int ignore; \ - if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ - __asm __volatile (__lll_unlock_asm_start \ - "1:\tlea %0, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_unlock_wake_private\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=m" (futex), "=&D" (ignore) \ - : "m" (futex) \ - : "ax", "cx", "r11", "cc", "memory"); \ - else \ - __asm __volatile (__lll_unlock_asm_start \ - "1:\tlea %0, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_unlock_wake\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=m" (futex), "=&D" (ignore) \ - : "m" (futex), "S" (private) \ - : "ax", "cx", "r11", "cc", "memory"); \ - }) - -#define lll_robust_unlock(futex, private) \ - do \ - { \ - int ignore; \ - __asm __volatile (LOCK_INSTR "andl %2, %0\n\t" \ - "je 24f\n\t" \ - "1:\tlea %0, %%" RDI_LP "\n" \ - "2:\tsub $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset 128\n" \ - "3:\tcallq __lll_unlock_wake\n" \ - "4:\tadd $128, %%" RSP_LP "\n" \ - ".cfi_adjust_cfa_offset -128\n" \ - "24:" \ - : "=m" (futex), "=&D" (ignore) \ - : "i" (FUTEX_WAITERS), "m" (futex), \ - "S" (private) \ - : "ax", "cx", "r11", "cc", "memory"); \ - } \ - while (0) - -#define lll_robust_dead(futex, private) \ - do \ - { \ - int ignore; \ - __asm __volatile (LOCK_INSTR "orl %3, (%2)\n\t" \ - "syscall" \ - : "=m" (futex), "=a" (ignore) \ - : "D" (&(futex)), "i" (FUTEX_OWNER_DIED), \ - "S" (__lll_private_flag (FUTEX_WAKE, private)), \ - "1" (__NR_futex), "d" (1) \ - : "cx", "r11", "cc", "memory"); \ - } \ - while (0) - -/* Returns non-zero if error happened, zero if success. */ -#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val, private) \ - ({ int __res; \ - register int __nr_move __asm ("r10") = nr_move; \ - register void *__mutex __asm ("r8") = mutex; \ - register int __val __asm ("r9") = val; \ - __asm __volatile ("syscall" \ - : "=a" (__res) \ - : "0" (__NR_futex), "D" ((void *) ftx), \ - "S" (__lll_private_flag (FUTEX_CMP_REQUEUE, \ - private)), "d" (nr_wake), \ - "r" (__nr_move), "r" (__mutex), "r" (__val) \ - : "cx", "r11", "cc", "memory"); \ - __res < 0; }) - -#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 ("xorq %%r10, %%r10\n\t" \ - "1:\tmovq %2, %%rax\n\t" \ - "syscall\n\t" \ - "cmpl $0, (%%rdi)\n\t" \ - "jne 1b" \ - : "=&a" (__ignore) \ - : "S" (FUTEX_WAIT), "i" (SYS_futex), "D" (&tid), \ - "d" (_tid) \ - : "memory", "cc", "r10", "r11", "cx"); \ - } while (0) - -extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) - 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 */ |