mirror of
https://sourceware.org/git/glibc.git
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258 lines
5.1 KiB
ArmAsm
258 lines
5.1 KiB
ArmAsm
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <unwindbuf.h>
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#include <sysdep.h>
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#include <kernel-features.h>
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#include <lowlevellock.h>
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#include "lowlevel-atomic.h"
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.comm __fork_generation, 4, 4
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.text
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.globl __pthread_once
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.type __pthread_once,@function
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.align 5
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cfi_startproc
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__pthread_once:
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mov.l @r4, r0
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tst #2, r0
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bt 1f
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rts
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mov #0, r0
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1:
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mov.l r12, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r12, 0)
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mov.l r9, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r9, 0)
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mov.l r8, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r8, 0)
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sts.l pr, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (pr, 0)
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mov r5, r8
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mov r4, r9
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/* Not yet initialized or initialization in progress.
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Get the fork generation counter now. */
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6:
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mov.l @r4, r1
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mova .Lgot, r0
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mov.l .Lgot, r12
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add r0, r12
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5:
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mov r1, r0
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tst #2, r0
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bf 4f
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and #3, r0
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mov.l .Lfgen, r2
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#ifdef PIC
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add r12, r2
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#endif
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mov.l @r2, r3
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or r3, r0
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or #1, r0
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mov r0, r3
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mov r1, r5
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CMPXCHG (r5, @r4, r3, r2)
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bf 5b
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/* Check whether another thread already runs the initializer. */
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mov r2, r0
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tst #1, r0
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bt 3f /* No -> do it. */
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/* Check whether the initializer execution was interrupted
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by a fork. */
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xor r3, r0
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mov #-4, r1 /* -4 = 0xfffffffc */
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tst r1, r0
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bf 3f /* Different for generation -> run initializer. */
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/* Somebody else got here first. Wait. */
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#ifdef __ASSUME_PRIVATE_FUTEX
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mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAIT), r5
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extu.b r5, r5
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#else
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stc gbr, r1
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mov.w .Lpfoff, r2
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add r2, r1
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mov.l @r1, r5
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# if FUTEX_WAIT != 0
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mov #FUTEX_WAIT, r0
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or r0, r5
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# endif
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#endif
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mov r3, r6
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mov #0, r7
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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bra 6b
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nop
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.align 2
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.Lgot:
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.long _GLOBAL_OFFSET_TABLE_
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#ifdef PIC
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.Lfgen:
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.long __fork_generation@GOTOFF
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#else
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.Lfgen:
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.long __fork_generation
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#endif
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3:
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/* Call the initializer function after setting up the
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cancellation handler. Note that it is not possible here
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to use the unwind-based cleanup handling. This would require
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that the user-provided function and all the code it calls
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is compiled with exceptions. Unfortunately this cannot be
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guaranteed. */
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add #-UNWINDBUFSIZE, r15
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cfi_adjust_cfa_offset (UNWINDBUFSIZE)
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mov.l .Lsigsetjmp, r1
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mov #UWJMPBUF, r4
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add r15, r4
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bsrf r1
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mov #0, r5
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.Lsigsetjmp0:
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tst r0, r0
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bf 7f
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mov.l .Lcpush, r1
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bsrf r1
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mov r15, r4
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.Lcpush0:
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/* Call the user-provided initialization function. */
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jsr @r8
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nop
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/* Pop the cleanup handler. */
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mov.l .Lcpop, r1
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bsrf r1
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mov r15, r4
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.Lcpop0:
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add #UNWINDBUFSIZE, r15
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cfi_adjust_cfa_offset (-UNWINDBUFSIZE)
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/* Sucessful run of the initializer. Signal that we are done. */
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INC (@r9, r2)
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/* Wake up all other threads. */
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mov r9, r4
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#ifdef __ASSUME_PRIVATE_FUTEX
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mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAKE), r5
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extu.b r5, r5
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#else
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stc gbr, r1
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mov.w .Lpfoff, r2
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add r2, r1
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mov.l @r1, r5
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mov #FUTEX_WAKE, r0
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or r0, r5
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#endif
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mov #-1, r6
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shlr r6 /* r6 = 0x7fffffff */
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mov #0, r7
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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4:
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lds.l @r15+, pr
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cfi_adjust_cfa_offset (-4)
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cfi_restore (pr)
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mov.l @r15+, r8
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r8)
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mov.l @r15+, r9
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r9)
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mov.l @r15+, r12
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r12)
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rts
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mov #0, r0
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7:
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/* __sigsetjmp returned for the second time. */
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cfi_adjust_cfa_offset (UNWINDBUFSIZE+16)
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cfi_offset (r12, -4)
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cfi_offset (r9, -8)
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cfi_offset (r8, -12)
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cfi_offset (pr, -16)
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mov #0, r7
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mov.l r7, @r9
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mov r9, r4
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#ifdef __ASSUME_PRIVATE_FUTEX
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mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAKE), r5
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#else
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stc gbr, r1
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mov.w .Lpfoff, r2
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add r2, r1
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mov.l @r1, r5
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mov #FUTEX_WAKE, r0
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or r0, r5
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#endif
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extu.b r5, r5
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mov #-1, r6
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shlr r6 /* r6 = 0x7fffffff */
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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mov.l .Lunext, r1
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bsrf r1
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mov r15, r4
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.Lunext0:
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/* NOTREACHED */
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sleep
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cfi_endproc
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#ifndef __ASSUME_PRIVATE_FUTEX
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.Lpfoff:
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.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
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#endif
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.align 2
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.Lsigsetjmp:
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.long __sigsetjmp@PLT-(.Lsigsetjmp0-.)
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.Lcpush:
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.long HIDDEN_JUMPTARGET(__pthread_register_cancel)-.Lcpush0
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.Lcpop:
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.long HIDDEN_JUMPTARGET(__pthread_unregister_cancel)-.Lcpop0
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.Lunext:
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.long HIDDEN_JUMPTARGET(__pthread_unwind_next)-.Lunext0
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.size __pthread_once,.-__pthread_once
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hidden_def (__pthread_once)
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strong_alias (__pthread_once, pthread_once)
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