From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 94149 invoked by alias); 17 Oct 2019 13:58:04 -0000 Mailing-List: contact glibc-cvs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: , Sender: glibc-cvs-owner@sourceware.org List-Subscribe: Received: (qmail 94132 invoked by uid 9943); 17 Oct 2019 13:58:04 -0000 Date: Thu, 17 Oct 2019 13:58:00 -0000 Message-ID: <20191017135804.94131.qmail@sourceware.org> Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc/azanella/bz12683] nptl: alpha: Fix Race conditions in pthread cancellation (BZ#12683) X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/azanella/bz12683 X-Git-Oldrev: d22512b88914013b237bae376227156717318e35 X-Git-Newrev: 30bee967eee3ff3b965a0f10ce7d3a0b7dd436d0 X-SW-Source: 2019-q4/txt/msg00089.txt.bz2 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=30bee967eee3ff3b965a0f10ce7d3a0b7dd436d0 commit 30bee967eee3ff3b965a0f10ce7d3a0b7dd436d0 Author: Adhemerval Zanella Date: Wed Jan 9 12:03:28 2019 -0200 nptl: alpha: Fix Race conditions in pthread cancellation (BZ#12683) This patch adds the alpha modifications required for the BZ#12683 fix by adding the arch-specific cancellation syscall bridge. Checked on alpha-linux-gnu. Diff: --- sysdeps/alpha/nptl/tcb-offsets.sym | 3 + sysdeps/unix/sysv/linux/alpha/syscall_cancel.S | 81 ++++++++++++++++++++++++++ 2 files changed, 84 insertions(+) diff --git a/sysdeps/alpha/nptl/tcb-offsets.sym b/sysdeps/alpha/nptl/tcb-offsets.sym index 1005621..15f2042 100644 --- a/sysdeps/alpha/nptl/tcb-offsets.sym +++ b/sysdeps/alpha/nptl/tcb-offsets.sym @@ -11,3 +11,6 @@ MULTIPLE_THREADS_OFFSET thread_offsetof (header.multiple_threads) TID_OFFSET thread_offsetof (tid) + +-- Not strictly offsets, used on syscall_cancel.S +TCB_CANCELED_BITMASK CANCELED_BITMASK diff --git a/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S b/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S new file mode 100644 index 0000000..fc3c77e --- /dev/null +++ b/sysdeps/unix/sysv/linux/alpha/syscall_cancel.S @@ -0,0 +1,81 @@ +/* Cancellable syscall wrapper. Linux/alpha version. + Copyright (C) 2019 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 + . */ + +#include + +/* long int __syscall_cancel_arch (int *ch, + __syscall_arg_t nr, + __syscall_arg_t arg1, + __syscall_arg_t arg2, + __syscall_arg_t arg3, + __syscall_arg_t arg4, + __syscall_arg_t arg5, + __syscall_arg_t arg6, + __syscall_arg_t arg7) */ + + .set noreorder + .set noat + .set nomacro +ENTRY (__syscall_cancel_arch) + .frame sp, 16, ra, 0 + .mask 0x4000000,-16 + cfi_startproc + ldah gp, 0(t12) + lda gp, 0(gp) + lda sp, -16(sp) + cfi_def_cfa_offset (16) + mov a1, v0 + stq ra, 0(sp) + cfi_offset (26, -16) + .prologue 1 + + .global __syscall_cancel_arch_start +__syscall_cancel_arch_start: + ldl t0, 0(a0) + addl zero, t0, t0 + /* if (*ch & CANCELED_BITMASK) */ + and t0, TCB_CANCELED_BITMASK, t0 + bne t0, 1f + mov a2, a0 + mov a3, a1 + mov a4, a2 + ldq a4, 16(sp) + mov a5, a3 + ldq a5, 24(sp) + .set macro + callsys + .set nomacro + + .global __syscall_cancel_arch_end +__syscall_cancel_arch_end: + subq zero, v0, t0 + ldq ra, 0(sp) + cmovne a3, t0, v0 + lda sp, 16(sp) + cfi_remember_state + cfi_restore (26) + cfi_def_cfa_offset (0) + ret zero, (ra), 1 + .align 4 +1: + cfi_restore_state + ldq t12, __syscall_do_cancel(gp) !literal!2 + jsr ra, (t12), __syscall_do_cancel !lituse_jsr!2 + cfi_endproc +END (__syscall_cancel_arch) +libc_hidden_def (__syscall_cancel_arch)