From 4c3023bc803012656cf45749960282351efc8020 Mon Sep 17 00:00:00 2001 From: Waldemar Brodkorb Date: Sat, 20 Sep 2014 22:36:23 +0200 Subject: xtensa: add support for NPTL Changes from: https://github.com/foss-xtensa/uClibc/commits/xtensa_nptl Author: Chris Zankel Author: Baruch Siach --- .../nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S | 59 ++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 libpthread/nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S') diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S b/libpthread/nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S new file mode 100644 index 000000000..46eb76dd6 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/xtensa/vfork.S @@ -0,0 +1,59 @@ +/* Copyright (C) 2013 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 + +/* + Save the PID value, save 0x80000000 if PID was 0. + Registers a2 and a3 are available; ar should return the PID and as threadptr + */ + +#define SAVE_PID(pid,tp,ar,as) \ + rur tp, threadptr; \ + movi ar, TLS_PRE_TCB_SIZE; \ + sub tp, tp, ar; \ + l32i pid, tp, PID; \ + neg ar, pid; \ + movi as, 0x80000000; \ + moveqz ar, as, ar; \ + s32i ar, tp, PID; \ + +/* + Restore the PID value, restore to 0 if saved value was 0x80000000 + Return value from the syscall is in a2. + */ +#define RESTORE_PID(pid,tp,res) \ + beqz res, 1f; \ + s32i pid, tp, PID; \ +1: + +/* + Special version for call12, where we don't have enough registers + available to preserve the original PID. + */ +#define RESTORE_PID12(ar, as, at) \ + rur as, threadptr; \ + movi ar, TLS_PRE_TCB_SIZE; \ + sub as, as, ar; \ + l32i ar, as, PID; \ + movi at, 0x80000000; \ + sub at, at, ar; \ + neg ar, ar; \ + moveqz ar, at, at; \ + s32i ar, as, PID; + +#include -- cgit v1.2.3