From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Subject: [PATCH v4 19/21] nptl: nios2: Fix Race conditions in pthread cancellation [BZ#12683]
Date: Fri, 3 Apr 2020 17:31:59 -0300 [thread overview]
Message-ID: <20200403203201.7494-20-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20200403203201.7494-1-adhemerval.zanella@linaro.org>
This patch adds the nios2 modifications required for the BZ#12683 fix
by adding the arch-specific cancellation syscall bridge.
Checked against a build and make check run-built-tests=no for
nios2-linux-gnu.
---
sysdeps/nios2/nptl/tcb-offsets.sym | 3 +
.../unix/sysv/linux/nios2/syscall_cancel.S | 95 +++++++++++++++++++
2 files changed, 98 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/nios2/syscall_cancel.S
diff --git a/sysdeps/nios2/nptl/tcb-offsets.sym b/sysdeps/nios2/nptl/tcb-offsets.sym
index 3cd8d984ac..3b0d37f93f 100644
--- a/sysdeps/nios2/nptl/tcb-offsets.sym
+++ b/sysdeps/nios2/nptl/tcb-offsets.sym
@@ -11,3 +11,6 @@
MULTIPLE_THREADS_OFFSET thread_offsetof (header.multiple_threads)
TID_OFFSET thread_offsetof (tid)
POINTER_GUARD (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t))
+
+-- Not strictly offsets, used on syscall_cancel.S
+TCB_CANCELED_BITMASK CANCELED_BITMASK
diff --git a/sysdeps/unix/sysv/linux/nios2/syscall_cancel.S b/sysdeps/unix/sysv/linux/nios2/syscall_cancel.S
new file mode 100644
index 0000000000..a8940e8b88
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nios2/syscall_cancel.S
@@ -0,0 +1,95 @@
+/* Cancellable syscall wrapper. Linux/nios2 version.
+ Copyright (C) 2020 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>
+
+/* long int __syscall_cancel_arch (int *cancelhandling,
+ __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) */
+
+ENTRY (__syscall_cancel_arch)
+#ifdef SHARED
+ addi sp, sp, -8
+ stw r22, 0(sp)
+ nextpc r22
+1:
+ movhi r8, %hiadj(_gp_got - 1b)
+ addi r8, r8, %lo(_gp_got - 1b)
+ stw ra, 4(sp)
+ add r22, r22, r8
+#else
+ addi sp, sp, -4
+ cfi_def_cfa_offset (4)
+ stw ra, 0(sp)
+ cfi_offset (31, -4)
+#endif
+
+ .globl __syscall_cancel_arch_start
+__syscall_cancel_arch_start:
+ ldw r3, 0(r4)
+ andi r3, r3, TCB_CANCELED_BITMASK
+ bne r3, zero, 3f
+ mov r10, r6
+ mov r2, r5
+#ifdef SHARED
+# define STACK_ADJ 4
+#else
+# define STACK_ADJ 0
+#endif
+ ldw r9, (16 + STACK_ADJ)(sp)
+ mov r5, r7
+ ldw r8, (12 + STACK_ADJ)(sp)
+ ldw r7, (8 + STACK_ADJ)(sp)
+ ldw r6, (4 + STACK_ADJ)(sp)
+ mov r4, r10
+ trap
+
+ .globl __syscall_cancel_arch_end
+__syscall_cancel_arch_end:
+ beq r7, zero, 2f
+ sub r2, zero, r2
+2:
+#ifdef SHARED
+ ldw ra, 4(sp)
+ ldw r22, 0(sp)
+ addi sp, sp, 8
+#else
+ ldw ra, (0 + STACK_ADJ)(sp)
+ cfi_remember_state
+ cfi_restore (31)
+ addi sp, sp, 4
+ cfi_def_cfa_offset (0)
+#endif
+ ret
+
+3:
+#ifdef SHARED
+ ldw r2, %call(__syscall_do_cancel)(r22)
+ callr r2
+#else
+ cfi_restore_state
+ call __syscall_do_cancel
+#endif
+
+END (__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)
--
2.17.1
next prev parent reply other threads:[~2020-04-03 20:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-03 20:31 [PATCH v4 00/21] nptl: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 01/21] nptl: Do not close the pipe on tst-cancel{2,3} Adhemerval Zanella
2020-04-07 15:24 ` Zack Weinberg
2020-04-07 20:07 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 02/21] nptl: Fix Race conditions in pthread cancellation [BZ#12683] Adhemerval Zanella
2020-04-07 18:24 ` Zack Weinberg
2020-04-08 14:13 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 03/21] nptl: x86_64: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 04/21] nptl: x32: " Adhemerval Zanella
2020-04-03 21:22 ` Joseph Myers
2020-04-07 12:47 ` Adhemerval Zanella
2020-04-07 12:54 ` H.J. Lu
2020-04-07 13:33 ` Adhemerval Zanella
2020-04-07 13:40 ` H.J. Lu
2020-04-07 13:41 ` H.J. Lu
2020-04-07 13:55 ` Adhemerval Zanella
2020-04-07 13:59 ` H.J. Lu
2020-04-07 14:04 ` Adhemerval Zanella
2020-04-07 15:45 ` H.J. Lu
2020-04-07 16:16 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 05/21] nptl: i386: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 06/21] nptl: ia64: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 07/21] nptl: mips: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 08/21] nptl: aarch64: " Adhemerval Zanella
2020-04-12 15:29 ` Stepan Golosunov
2020-04-15 14:30 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 09/21] nptl: arm: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 10/21] nptl: powerpc: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 11/21] nptl: microblaze: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 12/21] nptl: sparc: " Adhemerval Zanella
2020-04-12 15:33 ` Stepan Golosunov
2020-04-14 16:54 ` Stepan Golosunov
2020-04-15 14:48 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 13/21] nptl: hppa: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 14/21] nptl: m68k: " Adhemerval Zanella
2020-04-03 21:34 ` Andreas Schwab
2020-04-07 12:46 ` Adhemerval Zanella
2020-04-12 15:42 ` Stepan Golosunov
2020-04-15 14:51 ` Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 15/21] nptl: alpha: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 16/21] nptl: sh: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 17/21] nptl: riscv: " Adhemerval Zanella
2020-04-03 20:31 ` [PATCH v4 18/21] nptl: s390: " Adhemerval Zanella
2020-04-03 20:31 ` Adhemerval Zanella [this message]
2020-04-03 20:32 ` [PATCH v4 20/21] nptl: csky: " Adhemerval Zanella
2020-04-03 20:32 ` [PATCH v4 21/21] Linux: Remove sysdep-cancel header Adhemerval Zanella
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