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- /* 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
- <http://www.gnu.org/licenses/>. */
- #include <tls.h>
- /*
- 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 <libc/sysdeps/linux/xtensa/vfork.S>
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