From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Subject: [PATCH 08/19] nptl: arm: Fix Race conditions in pthread cancellation (BZ#12683)
Date: Mon, 11 Dec 2017 19:07:00 -0000 [thread overview]
Message-ID: <1513019223-7603-9-git-send-email-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <1513019223-7603-1-git-send-email-adhemerval.zanella@linaro.org>
This patch adds the ARM modifications required for the BZ#12683.
It basically adds the required ucontext_get_pc function and a arch
specific syscall_cancel implementation.
ARM requires an arch-specific syscall_cancel implementation because
INTERNAL_SYSCALL_NCS may call an auxiliary symbol (__libc_do_syscall)
for thumb which invalides the check on sigcancel_handler.
Checked on arm-linux-gnueabihf.
* sysdeps/unix/sysv/linux/arm/syscall_cancel.S: New file.
* sysdeps/unix/sysv/linux/arm/sigcontextinfo.h (ucontext_get_pc):
New function.
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
ChangeLog | 4 ++
sysdeps/unix/sysv/linux/arm/sigcontextinfo.h | 12 +++++
sysdeps/unix/sysv/linux/arm/syscall_cancel.S | 69 ++++++++++++++++++++++++++++
3 files changed, 85 insertions(+)
create mode 100644 sysdeps/unix/sysv/linux/arm/syscall_cancel.S
diff --git a/sysdeps/unix/sysv/linux/arm/sigcontextinfo.h b/sysdeps/unix/sysv/linux/arm/sigcontextinfo.h
index d3313af..8132a95 100644
--- a/sysdeps/unix/sysv/linux/arm/sigcontextinfo.h
+++ b/sysdeps/unix/sysv/linux/arm/sigcontextinfo.h
@@ -16,6 +16,10 @@
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
+#ifndef _SIGCONTEXTINFO_H
+#define _SIGCONTEXTINFO_H
+
+#include <stdint.h>
#include <sys/ucontext.h>
#define SIGCONTEXT siginfo_t *_si, ucontext_t *
@@ -46,3 +50,11 @@
(act)->sa_flags |= SA_SIGINFO; \
(sigaction) (sig, act, oact); \
})
+
+static inline uintptr_t
+ucontext_get_pc (const ucontext_t *uc)
+{
+ return uc->uc_mcontext.arm_pc;
+}
+
+#endif /* _SIGCONTEXTINFO_H */
diff --git a/sysdeps/unix/sysv/linux/arm/syscall_cancel.S b/sysdeps/unix/sysv/linux/arm/syscall_cancel.S
new file mode 100644
index 0000000..5ae1412
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/arm/syscall_cancel.S
@@ -0,0 +1,69 @@
+/* Cancellable syscall wrapper. Linux/arm version.
+ Copyright (C) 2017 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 [r0] __syscall_cancel_arch (int *cancelhandling [r0],
+ long int nr [r1],
+ long int arg1 [r2],
+ long int arg2 [r3],
+ long int arg3 [SP],
+ long int arg4 [SP+4],
+ long int arg5 [SP+8],
+ long int arg6 [SP+12]) */
+
+ .syntax unified
+
+ENTRY (__syscall_cancel_arch)
+ .fnstart
+ mov ip,sp
+ stmfd sp!, {r4,r5,r6,r7,lr}
+ .save {r4,r5,r6,r7,lr}
+
+ cfi_adjust_cfa_offset (20)
+ cfi_rel_offset (lr, 16)
+
+ .globl __syscall_cancel_arch_start
+__syscall_cancel_arch_start:
+
+ /* if (*cancelhandling & CANCELED_BITMASK)
+ __syscall_do_cancel() */
+ ldr r0, [r0]
+ tst r0, #4
+ bne 1f
+
+ /* Issue a 6 argument syscall, the nr [r1] being the syscall
+ number. */
+ mov r7, r1
+ mov r0, r2
+ mov r1, r3
+ ldmfd ip, {r2,r3,r4,r5,r6}
+ svc 0x0
+
+ .globl __syscall_cancel_arch_end
+__syscall_cancel_arch_end:
+ ldmfd sp!, {r4,r5,r6,r7,lr}
+ cfi_adjust_cfa_offset (-20);
+ bx lr
+
+1:
+ mov lr, pc
+ b __syscall_do_cancel
+ .fnend
+END (__syscall_cancel_arch)
+libc_hidden_def (__syscall_cancel_arch)
--
2.7.4
next prev parent reply other threads:[~2017-12-11 19:07 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-11 19:07 [PATCH 00/19] nptl: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 07/19] nptl: aarch64: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 02/19] nptl: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 10/19] nptl: ia64: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 06/19] nptl: powerpc: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 12/19] nptl: m68k: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 14/19] nptl: tile: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 11/19] nptl: alpha: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 15/19] nptl: sparc: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 05/19] nptl: i386: " Adhemerval Zanella
2017-12-11 19:07 ` Adhemerval Zanella [this message]
2017-12-11 20:16 ` [PATCH 08/19] nptl: arm: " Phil Blundell
2017-12-11 20:29 ` Andreas Schwab
2017-12-11 21:03 ` Phil Blundell
2017-12-11 23:57 ` Joseph Myers
2017-12-12 12:28 ` Adhemerval Zanella
2017-12-12 13:51 ` Joseph Myers
2017-12-12 14:03 ` Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 16/19] nptl: nios2: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 01/19] nptl: Fix testcases for new pthread cancellation mechanism Adhemerval Zanella
2017-12-12 12:18 ` Florian Weimer
2017-12-12 12:27 ` Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 19/19] nptl: hppa: Fix Race conditions in pthread cancellation (BZ#12683) Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 17/19] nptl: sh: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 03/19] nptl: x86_64: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 18/19] nptl: mips: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 04/19] nptl: x32: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 09/19] nptl: s390: " Adhemerval Zanella
2017-12-11 19:07 ` [PATCH 13/19] nptl: microblaze: " Adhemerval Zanella
2017-12-11 19:18 ` [PATCH 00/19] nptl: " John Paul Adrian Glaubitz
2017-12-11 20:31 ` Adhemerval Zanella
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1513019223-7603-9-git-send-email-adhemerval.zanella@linaro.org \
--to=adhemerval.zanella@linaro.org \
--cc=libc-alpha@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).