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|
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 "lowlevel-atomic.h"
.text
#ifdef __ASSUME_PRIVATE_FUTEX
# define LOAD_PRIVATE_FUTEX_WAIT(reg,tmp,tmp2) \
mov #(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg; \
extu.b reg, reg
# define LOAD_PRIVATE_FUTEX_WAKE(reg,tmp,tmp2) \
mov #(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg; \
extu.b reg, reg
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
mov #(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), tmp; \
extu.b tmp, tmp; \
xor tmp, reg
# define LOAD_FUTEX_WAIT_ABS(reg,tmp,tmp2) \
mov #(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG), tmp; \
extu.b tmp, tmp; \
mov #(FUTEX_CLOCK_REALTIME >> 8), tmp2; \
swap.b tmp2, tmp2; \
or tmp2, tmp; \
xor tmp, reg
# define LOAD_FUTEX_WAKE(reg,tmp,tmp2) \
mov #(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), tmp; \
extu.b tmp, tmp; \
xor tmp, reg
#else
# if FUTEX_WAIT == 0
# define LOAD_PRIVATE_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, reg ; \
add reg, tmp ; \
bra 98f ; \
mov.l @tmp, reg ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98:
# else
# define LOAD_PRIVATE_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, reg ; \
add reg, tmp ; \
mov.l @tmp, reg ; \
bra 98f ; \
mov #FUTEX_WAIT, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: or tmp, reg
# endif
# define LOAD_PRIVATE_FUTEX_WAKE(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, reg ; \
add reg, tmp ; \
mov.l @tmp, reg ; \
bra 98f ; \
mov #FUTEX_WAKE, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: or tmp, reg
# if FUTEX_WAIT == 0
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg
# else
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg ; \
mov #FUTEX_WAIT, tmp ; \
or tmp, reg
# endif
# define LOAD_FUTEX_WAIT_ABS(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg ; \
mov #FUTEX_WAIT_BITSET, tmp ; \
mov #(FUTEX_CLOCK_REALTIME >> 8), tmp2; \
swap.b tmp2, tmp2; \
or tmp2, tmp; \
or tmp, reg
# define LOAD_FUTEX_WAKE(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg ; \
mov #FUTEX_WAKE, tmp ; \
or tmp, reg
#endif
.globl __lll_lock_wait_private
.type __lll_lock_wait_private,@function
.hidden __lll_lock_wait_private
.align 5
cfi_startproc
__lll_lock_wait_private:
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r4, r6
mov r5, r8
mov #0, r7 /* No timeout. */
LOAD_PRIVATE_FUTEX_WAIT (r5, r0, r1)
mov #2, r4
cmp/eq r4, r6
bf 2f
1:
mov r8, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
2:
mov #2, r6
XCHG (r6, @r8, r2)
tst r2, r2
bf 1b
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
rts
mov r2, r0
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 5
cfi_startproc
__lll_lock_wait:
mov.l r9, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r9, 0)
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r6, r9
mov r4, r6
mov r5, r8
mov #0, r7 /* No timeout. */
mov r9, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
mov #2, r4
cmp/eq r4, r6
bf 2f
1:
mov r8, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
2:
mov #2, r6
XCHG (r6, @r8, r2)
tst r2, r2
bf 1b
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
mov.l @r15+, r9
cfi_adjust_cfa_offset (-4)
cfi_restore (r9)
ret
mov r2, r0
cfi_endproc
.size __lll_lock_wait,.-__lll_lock_wait
/* r5 (r8): futex
r7 (r11): flags
r6 (r9): timeout
r4 (r10): futex value
*/
.globl __lll_timedlock_wait
.type __lll_timedlock_wait,@function
.hidden __lll_timedlock_wait
.align 5
cfi_startproc
__lll_timedlock_wait:
mov.l r12, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r12, 0)
# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
mov.l .Lhave, r1
# ifdef PIC
mova .Lgot, r0
mov.l .Lgot, r12
add r0, r12
add r12, r1
# endif
mov.l @r1, r0
tst r0, r0
bt .Lreltmo
# endif
/* if (timeout->tv_sec < 0) return ETIMEDOUT; */
mov.l @r6, r1
cmp/pz r1
bf/s 5f
mov #ETIMEDOUT, r0
mov r4, r2
mov r5, r4
mov r7, r5
mov r6, r7
LOAD_FUTEX_WAIT_ABS (r5, r0, r1)
mov #2, r6
cmp/eq r6, r2
bf/s 2f
mov r6, r2
1:
mov #2, r6
mov #-1, r1
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x16
SYSCALL_INST_PAD
mov r0, r6
2:
XCHG (r2, @r4, r3) /* NB: lock is implied */
tst r3, r3
bt/s 3f
mov r6, r0
cmp/eq #-ETIMEDOUT, r0
bt 4f
cmp/eq #-EINVAL, r0
bf 1b
4:
neg r0, r3
3:
mov r3, r0
5:
rts
mov.l @r15+, r12
/* Omit CFI for restore in delay slot. */
# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.align 2
# ifdef PIC
.Lgot:
.long _GLOBAL_OFFSET_TABLE_
.Lhave:
.long __have_futex_clock_realtime@GOTOFF
# else
.Lhave:
.long __have_futex_clock_realtime
# endif
.Lreltmo:
/* Check for a valid timeout value. */
mov.l @(4,r6), r1
mov.l .L1g, r0
cmp/hs r0, r1
bt 3f
cfi_remember_state
mov.l r11, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r11, 0)
mov.l r10, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r10, 0)
mov.l r9, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r9, 0)
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r7, r11
mov r4, r10
mov r6, r9
mov r5, r8
/* Stack frame for the timespec and timeval structs. */
add #-8, r15
cfi_adjust_cfa_offset(8)
mov #2, r2
XCHG (r2, @r8, r3)
tst r3, r3
bt 6f
1:
/* Get current time. */
mov r15, r4
mov #0, r5
mov #__NR_gettimeofday, r3
trapa #0x12
SYSCALL_INST_PAD
/* Compute relative timeout. */
mov.l @(4,r15), r0
mov.w .L1k, r1
dmulu.l r0, r1 /* Micro seconds to nano seconds. */
mov.l @r9, r2
mov.l @(4,r9), r3
mov.l @r15, r0
sts macl, r1
sub r0, r2
clrt
subc r1, r3
bf 4f
mov.l .L1g, r1
add r1, r3
add #-1, r2
4:
cmp/pz r2
bf 2f /* Time is already up. */
mov.l r2, @r15 /* Store relative timeout. */
mov.l r3, @(4,r15)
mov r8, r4
mov r11, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
mov r10, r6
mov r15, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov r0, r5
mov #2, r2
XCHG (r2, @r8, r3)
tst r3, r3
bt/s 6f
mov #-ETIMEDOUT, r1
cmp/eq r5, r1
bf 1b
2: mov #ETIMEDOUT, r3
6:
add #8, r15
cfi_adjust_cfa_offset (-8)
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
mov.l @r15+, r9
cfi_adjust_cfa_offset (-4)
cfi_restore (r9)
mov.l @r15+, r10
cfi_adjust_cfa_offset (-4)
cfi_restore (r10)
mov.l @r15+, r11
cfi_adjust_cfa_offset (-4)
cfi_restore (r11)
mov.l @r15+, r12
cfi_adjust_cfa_offset (-4)
cfi_restore (r12)
rts
mov r3, r0
cfi_restore_state
3:
mov.l @r15+, r12
cfi_adjust_cfa_offset (-4)
cfi_restore (r12)
rts
mov #EINVAL, r0
# endif
cfi_endproc
.L1k:
.word 1000
.align 2
.L1g:
.long 1000000000
.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 5
cfi_startproc
__lll_unlock_wake_private:
LOAD_PRIVATE_FUTEX_WAKE (r5, r0, r1)
mov #1, r6 /* Wake one thread. */
mov #0, r7
mov.l r7, @r4 /* Stores 0. */
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
rts
nop
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 5
cfi_startproc
__lll_unlock_wake:
LOAD_FUTEX_WAKE (r5, r0, r1)
mov #1, r6 /* Wake one thread. */
mov #0, r7
mov.l r7, @r4 /* Stores 0. */
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
rts
nop
cfi_endproc
.size __lll_unlock_wake,.-__lll_unlock_wake
.globl __lll_timedwait_tid
.type __lll_timedwait_tid,@function
.hidden __lll_timedwait_tid
.align 5
cfi_startproc
__lll_timedwait_tid:
mov.l r9, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r9, 0)
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r4, r8
mov r5, r9
/* Stack frame for the timespec and timeval structs. */
add #-8, r15
cfi_adjust_cfa_offset(8)
2:
/* Get current time. */
mov r15, r4
mov #0, r5
mov #__NR_gettimeofday, r3
trapa #0x12
SYSCALL_INST_PAD
/* Compute relative timeout. */
mov.l @(4,r15), r0
mov.w .L1k2, r1
dmulu.l r0, r1 /* Micro seconds to nano seconds. */
mov.l @r9, r2
mov.l @(4,r9), r3
mov.l @r15, r0
sts macl, r1
sub r0, r2
clrt
subc r1, r3
bf 5f
mov.l .L1g2, r1
add r1, r3
add #-1, r2
5:
cmp/pz r2
bf 6f /* Time is already up. */
mov.l r2, @r15 /* Store relative timeout. */
mov.l r3, @(4,r15)
mov.l @r8, r2
tst r2, r2
bt 4f
mov r8, r4
/* XXX The kernel so far uses global futex for the wakeup at
all times. */
mov #0, r5
extu.b r5, r5
mov r2, r6
mov r15, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov.l @r8, r2
tst r2, r2
bf 1f
4:
mov #0, r0
3:
cfi_remember_state
add #8, r15
cfi_adjust_cfa_offset (-8)
mov.l @r15+, r8
cfi_adjust_cfa_offset (-4)
cfi_restore (r8)
rts
mov.l @r15+, r9
/* Omit CFI for restore in delay slot. */
cfi_restore_state
1:
/* Check whether the time expired. */
mov #-ETIMEDOUT, r1
cmp/eq r0, r1
bf 2b
6:
bra 3b
mov #ETIMEDOUT, r0
cfi_endproc
.L1k2:
.word 1000
.align 2
.L1g2:
.long 1000000000
.size __lll_timedwait_tid,.-__lll_timedwait_tid
#endif
|
