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|
/* Copyright (C) 2002, 2003, 2004, 2006 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _LOWLEVELLOCK_H
#define _LOWLEVELLOCK_H 1
#include <time.h>
#include <sys/param.h>
#include <bits/pthreadtypes.h>
#ifndef LOCK_INSTR
# ifdef UP
# define LOCK_INSTR /* nothing */
# else
# define LOCK_INSTR "lock;"
# endif
#endif
#define SYS_futex 202
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
/* Delay in spinlock loop. */
#define BUSY_WAIT_NOP asm ("rep; nop")
#ifdef USE_CFA_VAL_EXPRESSION
# define LLL_STUB_UNWIND_INFO_START \
".section .eh_frame,\"a\",@progbits\n" \
"7:\t" ".long 9f-8f # Length of Common Information Entry\n" \
"8:\t" ".long 0x0 # CIE Identifier Tag\n\t" \
".byte 0x1 # CIE Version\n\t" \
".ascii \"zR\\0\" # CIE Augmentation\n\t" \
".uleb128 0x1 # CIE Code Alignment Factor\n\t" \
".sleb128 -8 # CIE Data Alignment Factor\n\t" \
".byte 0x10 # CIE RA Column\n\t" \
".uleb128 0x1 # Augmentation size\n\t" \
".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \
".byte 0x12 # DW_CFA_def_cfa_sf\n\t" \
".uleb128 0x7\n\t" \
".sleb128 16\n\t" \
".align 8\n" \
"9:\t" ".long 23f-10f # FDE Length\n" \
"10:\t" ".long 10b-7b # FDE CIE offset\n\t" \
".long 1b-. # FDE initial location\n\t" \
".long 6b-1b # FDE address range\n\t" \
".uleb128 0x0 # Augmentation size\n\t" \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 12f-11f\n" \
"11:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 4b-1b\n"
# define LLL_STUB_UNWIND_INFO_END \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 14f-13f\n" \
"13:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 4b-2b\n" \
"14:\t" ".byte 0x40 + (3b-2b) # DW_CFA_advance_loc\n\t" \
".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
".uleb128 0\n\t" \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 16f-15f\n" \
"15:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 4b-3b\n" \
"16:\t" ".byte 0x40 + (4b-3b-1) # DW_CFA_advance_loc\n\t" \
".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
".uleb128 128\n\t" \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 20f-17f\n" \
"17:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 19f-18f\n\t" \
".byte 0x0d # DW_OP_const4s\n" \
"18:\t" ".4byte 4b-.\n\t" \
".byte 0x1c # DW_OP_minus\n\t" \
".byte 0x0d # DW_OP_const4s\n" \
"19:\t" ".4byte 24f-.\n\t" \
".byte 0x22 # DW_OP_plus\n" \
"20:\t" ".byte 0x40 + (5b-4b+1) # DW_CFA_advance_loc\n\t" \
".byte 0x13 # DW_CFA_def_cfa_offset_sf\n\t" \
".sleb128 16\n\t" \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 22f-21f\n" \
"21:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 4b-5b\n" \
"22:\t" ".align 8\n" \
"23:\t" ".previous\n"
/* Unwind info for
1: leaq ..., %rdi
2: subq $128, %rsp
3: callq ...
4: addq $128, %rsp
5: jmp 24f
6:
snippet. */
# define LLL_STUB_UNWIND_INFO_5 \
LLL_STUB_UNWIND_INFO_START \
"12:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \
LLL_STUB_UNWIND_INFO_END
/* Unwind info for
1: leaq ..., %rdi
0: movq ..., %rdx
2: subq $128, %rsp
3: callq ...
4: addq $128, %rsp
5: jmp 24f
6:
snippet. */
# define LLL_STUB_UNWIND_INFO_6 \
LLL_STUB_UNWIND_INFO_START \
"12:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \
".byte 0x16 # DW_CFA_val_expression\n\t" \
".uleb128 0x10\n\t" \
".uleb128 26f-25f\n" \
"25:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
".sleb128 4b-0b\n" \
"26:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \
LLL_STUB_UNWIND_INFO_END
#else
# define LLL_STUB_UNWIND_INFO_5
# define LLL_STUB_UNWIND_INFO_6
#endif
#define lll_futex_wait(futex, val) \
({ \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile ("xorq %%r10, %%r10\n\t" \
"syscall" \
: "=a" (__status) \
: "0" (SYS_futex), "D" (futex), "S" (FUTEX_WAIT), \
"d" (_val) \
: "memory", "cc", "r10", "r11", "cx"); \
__status; \
})
#define lll_futex_timed_wait(futex, val, timeout) \
({ \
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" (FUTEX_WAIT), \
"d" (_val), "r" (__to) \
: "memory", "cc", "r11", "cx"); \
__status; \
})
#define lll_futex_wake(futex, nr) \
do { \
int __ignore; \
register __typeof (nr) _nr asm ("edx") = (nr); \
__asm __volatile ("syscall" \
: "=a" (__ignore) \
: "0" (SYS_futex), "D" (futex), "S" (FUTEX_WAKE), \
"d" (_nr) \
: "memory", "cc", "r10", "r11", "cx"); \
} while (0)
/* Does not preserve %eax and %ecx. */
extern int __lll_mutex_lock_wait (int *__futex, int __val) attribute_hidden;
/* Does not preserver %eax, %ecx, and %edx. */
extern int __lll_mutex_timedlock_wait (int *__futex, int __val,
const struct timespec *__abstime)
attribute_hidden;
/* Preserves all registers but %eax. */
extern int __lll_mutex_unlock_wait (int *__futex) attribute_hidden;
/* NB: in the lll_mutex_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. */
#define lll_mutex_trylock(futex) \
({ int ret; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
"0" (LLL_MUTEX_LOCK_INITIALIZER) \
: "memory"); \
ret; })
#define lll_robust_mutex_trylock(futex, id) \
({ int ret; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (id), "m" (futex), \
"0" (LLL_MUTEX_LOCK_INITIALIZER) \
: "memory"); \
ret; })
#define lll_mutex_cond_trylock(futex) \
({ int ret; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
"m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \
: "memory"); \
ret; })
#define lll_mutex_lock(futex) \
(void) ({ int ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_mutex_lock_%=, @function\n" \
"_L_mutex_lock_%=:\n" \
"1:\tleaq %2, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_lock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_mutex_lock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=S" (ignore1), "=&D" (ignore2), "=m" (futex),\
"=a" (ignore3) \
: "0" (1), "m" (futex), "3" (0) \
: "cx", "r11", "cc", "memory"); })
#define lll_robust_mutex_lock(futex, id) \
({ int result, ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "cmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_robust_mutex_lock_%=, @function\n" \
"_L_robust_mutex_lock_%=:\n" \
"1:\tleaq %2, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_robust_mutex_lock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_robust_mutex_lock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \
"=a" (result) \
: "0" (id), "m" (futex), "3" (0) \
: "cx", "r11", "cc", "memory"); \
result; })
#define lll_mutex_cond_lock(futex) \
(void) ({ int ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_mutex_cond_lock_%=, @function\n" \
"_L_mutex_cond_lock_%=:\n" \
"1:\tleaq %2, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_lock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_mutex_cond_lock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=S" (ignore1), "=&D" (ignore2), "=m" (futex),\
"=a" (ignore3) \
: "0" (2), "m" (futex), "3" (0) \
: "cx", "r11", "cc", "memory"); })
#define lll_robust_mutex_cond_lock(futex, id) \
({ int result, ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "cmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_robust_mutex_cond_lock_%=, @function\n" \
"_L_robust_mutex_cond_lock_%=:\n" \
"1:\tleaq %2, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_robust_mutex_lock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_robust_mutex_cond_lock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \
"=a" (result) \
: "0" (id | FUTEX_WAITERS), "m" (futex), "3" (0) \
: "cx", "r11", "cc", "memory"); \
result; })
#define lll_mutex_timedlock(futex, timeout) \
({ int result, ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %4\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_mutex_timedlock_%=, @function\n" \
"_L_mutex_timedlock_%=:\n" \
"1:\tleaq %4, %%rdi\n" \
"0:\tmovq %8, %%rdx\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_timedlock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_mutex_timedlock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_6 \
"24:" \
: "=a" (result), "=&D" (ignore1), "=S" (ignore2), \
"=&d" (ignore3), "=m" (futex) \
: "0" (0), "2" (1), "m" (futex), "m" (timeout) \
: "memory", "cx", "cc", "r10", "r11"); \
result; })
#define lll_robust_mutex_timedlock(futex, timeout, id) \
({ int result, ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %4\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_robust_mutex_timedlock_%=, @function\n" \
"_L_robust_mutex_timedlock_%=:\n" \
"1:\tleaq %4, %%rdi\n" \
"0:\tmovq %8, %%rdx\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_robust_mutex_timedlock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_robust_mutex_timedlock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_6 \
"24:" \
: "=a" (result), "=&D" (ignore1), "=S" (ignore2), \
"=&d" (ignore3), "=m" (futex) \
: "0" (0), "2" (id), "m" (futex), "m" (timeout) \
: "memory", "cx", "cc", "r10", "r11"); \
result; })
#define lll_mutex_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile (LOCK_INSTR "decl %0\n\t" \
"jne 1f\n\t" \
".subsection 1\n\t" \
".type _L_mutex_unlock_%=, @function\n" \
"_L_mutex_unlock_%=:\n" \
"1:\tleaq %0, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_unlock_wake\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_mutex_unlock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=m" (futex), "=&D" (ignore) \
: "m" (futex) \
: "ax", "cx", "r11", "cc", "memory"); })
#define lll_robust_mutex_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile (LOCK_INSTR "andl %2, %0\n\t" \
"jne 1f\n\t" \
".subsection 1\n\t" \
".type _L_robust_mutex_unlock_%=, @function\n" \
"_L_robust_mutex_unlock_%=:\n" \
"1:\tleaq %0, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_unlock_wake\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_robust_mutex_unlock_%=, 6b-1b\n\t"\
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=m" (futex), "=&D" (ignore) \
: "i" (FUTEX_WAITERS), "m" (futex) \
: "ax", "cx", "r11", "cc", "memory"); })
#define lll_robust_mutex_dead(futex) \
(void) ({ int ignore; \
__asm __volatile (LOCK_INSTR "orl %3, (%2)\n\t" \
"syscall" \
: "=m" (futex), "=a" (ignore) \
: "D" (&(futex)), "i" (FUTEX_OWNER_DIED), \
"S" (FUTEX_WAKE), "1" (__NR_futex), \
"d" (1) \
: "cx", "r11", "cc", "memory"); })
#define lll_mutex_islocked(futex) \
(futex != LLL_MUTEX_LOCK_INITIALIZER)
/* We have a separate internal lock implementation which is not tied
to binary compatibility. */
/* Type for lock object. */
typedef int lll_lock_t;
/* Initializers for lock. */
#define LLL_LOCK_INITIALIZER (0)
#define LLL_LOCK_INITIALIZER_LOCKED (1)
extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
/* The states of a lock are:
0 - untaken
1 - taken by one user
2 - taken by more users */
#if defined NOT_IN_libc || defined UP
# define lll_trylock(futex) lll_mutex_trylock (futex)
# define lll_lock(futex) lll_mutex_lock (futex)
# define lll_unlock(futex) lll_mutex_unlock (futex)
#else
/* Special versions of the macros for use in libc itself. They avoid
the lock prefix when the thread library is not used.
The code sequence to avoid unnecessary lock prefixes is what the AMD
guys suggested. If you do not like it, bring it up with AMD.
XXX In future we might even want to avoid it on UP machines. */
# define lll_trylock(futex) \
({ unsigned char ret; \
__asm __volatile ("cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
"je 0f\n\t" \
"lock; cmpxchgl %2, %1\n\t" \
"jmp 1f\n" \
"0:\tcmpxchgl %2, %1\n\t" \
"1:setne %0" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
"0" (LLL_MUTEX_LOCK_INITIALIZER) \
: "memory"); \
ret; })
# define lll_lock(futex) \
(void) ({ int ignore1, ignore2, ignore3; \
__asm __volatile ("cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
"je 0f\n\t" \
"lock; cmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
"jmp 24f\n" \
"0:\tcmpxchgl %0, %2\n\t" \
"jnz 1f\n\t" \
".subsection 1\n\t" \
".type _L_lock_%=, @function\n" \
"_L_lock_%=:\n" \
"1:\tleaq %2, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_lock_wait\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_lock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=S" (ignore1), "=&D" (ignore2), "=m" (futex),\
"=a" (ignore3) \
: "0" (1), "m" (futex), "3" (0) \
: "cx", "r11", "cc", "memory"); })
# define lll_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile ("cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
"je 0f\n\t" \
"lock; decl %0\n\t" \
"jne 1f\n\t" \
"jmp 24f\n" \
"0:\tdecl %0\n\t" \
"jne 1f\n\t" \
".subsection 1\n\t" \
".type _L_unlock_%=, @function\n" \
"_L_unlock_%=:\n" \
"1:\tleaq %0, %%rdi\n" \
"2:\tsubq $128, %%rsp\n" \
"3:\tcallq __lll_mutex_unlock_wake\n" \
"4:\taddq $128, %%rsp\n" \
"5:\tjmp 24f\n" \
"6:\t.size _L_unlock_%=, 6b-1b\n\t" \
".previous\n" \
LLL_STUB_UNWIND_INFO_5 \
"24:" \
: "=m" (futex), "=&D" (ignore) \
: "m" (futex) \
: "ax", "cx", "r11", "cc", "memory"); })
#endif
#define lll_islocked(futex) \
(futex != LLL_MUTEX_LOCK_INITIALIZER)
/* The kernel notifies a process with uses CLONE_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; })
/* Conditional variable handling. */
extern void __lll_cond_wait (pthread_cond_t *cond) attribute_hidden;
extern int __lll_cond_timedwait (pthread_cond_t *cond,
const struct timespec *abstime)
attribute_hidden;
extern void __lll_cond_wake (pthread_cond_t *cond) attribute_hidden;
extern void __lll_cond_broadcast (pthread_cond_t *cond) attribute_hidden;
#define lll_cond_wait(cond) \
__lll_cond_wait (cond)
#define lll_cond_timedwait(cond, abstime) \
__lll_cond_timedwait (cond, abstime)
#define lll_cond_wake(cond) \
__lll_cond_wake (cond)
#define lll_cond_broadcast(cond) \
__lll_cond_broadcast (cond)
#endif /* lowlevellock.h */
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