largely derived from aarch64 code.
usertc.c taken from hppa
with cleanup to Symbols.list and tfork_thread.S
Further cleanup and enhancement will be performed in-tree.
ok kettenis@
--- /dev/null
+# $OpenBSD: Makefile.inc,v 1.1 2021/04/29 18:33:36 drahn Exp $
+.include <bsd.own.mk>
+
+CERROR= cerror.S
+
--- /dev/null
+/* $OpenBSD: SYS.h,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*-
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
+ */
+
+#include "DEFS.h"
+#include <sys/syscall.h>
+
+#define SYSENTRY(x) \
+ .weak _C_LABEL(x); \
+ _C_LABEL(x) = _C_LABEL(_thread_sys_ ## x); \
+ ENTRY(_thread_sys_ ## x)
+#define SYSENTRY_HIDDEN(x) \
+ ENTRY(_thread_sys_ ## x)
+#define __END_HIDDEN(x) \
+ END(_thread_sys_ ## x); \
+ _HIDDEN_FALIAS(x, _thread_sys_ ## x); \
+ END(_HIDDEN(x))
+#define __END(x) \
+ __END_HIDDEN(x); END(x)
+
+#define SYSTRAP(x) \
+ li t0, SYS_ ## x; \
+ ecall
+
+#define CERROR _C_LABEL(__cerror)
+#define HANDLE_ERROR() \
+ bnez t0, 1f; \
+ ret; \
+1: auipc t0, %got_pcrel_hi(CERROR); \
+ ld t1, %pcrel_lo(1b)(t0); \
+ jr t1
+
+#define _SYSCALL_NOERROR(x,y) \
+ SYSENTRY(x); \
+ SYSTRAP(y)
+#define _SYSCALL_HIDDEN_NOERROR(x,y) \
+ SYSENTRY_HIDDEN(x); \
+ SYSTRAP(y)
+
+#define _SYSCALL(x, y) \
+ _SYSCALL_NOERROR(x,y); \
+ HANDLE_ERROR
+#define _SYSCALL_HIDDEN(x, y) \
+ _SYSCALL_HIDDEN_NOERROR(x,y); \
+ HANDLE_ERROR
+
+#define SYSCALL_NOERROR(x) \
+ _SYSCALL_NOERROR(x,x)
+
+#define SYSCALL(x) \
+ _SYSCALL(x,x)
+
+
+#define PSEUDO_NOERROR(x,y) \
+ SYSENTRY(x); \
+ RETGUARD_SETUP(x, t6); \
+ SYSTRAP(y); \
+ RETGUARD_CHECK(x, t6); \
+ ret; \
+ __END(x)
+
+#define PSEUDO(x,y) \
+ SYSENTRY(x); \
+ RETGUARD_SETUP(x, t6); \
+ SYSTRAP(y); \
+ HANDLE_ERROR(); \
+ RETGUARD_CHECK(x, t6); \
+ ret; \
+ __END(x)
+#define PSEUDO_HIDDEN(x,y) \
+ SYSENTRY_HIDDEN(x); \
+ RETGUARD_SETUP(x, t6); \
+ SYSTRAP(y); \
+ HANDLE_ERROR(); \
+ RETGUARD_CHECK(x, t6); \
+ ret; \
+ __END_HIDDEN(x)
+
+#define RSYSCALL_NOERROR(x) \
+ PSEUDO_NOERROR(x,x)
+
+#define RSYSCALL(x) \
+ PSEUDO(x,x)
+#define RSYSCALL_HIDDEN(x) \
+ PSEUDO_HIDDEN(x,x)
+#define SYSCALL_END(x) \
+ __END(x)
+#define SYSCALL_END_HIDDEN(x) \
+ __END_HIDDEN(x)
+
+ .globl CERROR
--- /dev/null
+__mcount
+fabsl
+frexpl
+ldexpl
+modfl
--- /dev/null
+/* $OpenBSD: _atomic_lock.c,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Mars Li <mengshi.li.mars@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Atomic lock for riscv64
+ */
+
+#include <sys/types.h>
+#include <machine/spinlock.h>
+
+/*
+ * Spinlock does not have Aquire/Release semantics, so amoswap.w.aq
+ * should not used here.
+ */
+int
+_atomic_lock(volatile _atomic_lock_t *lock)
+{
+ _atomic_lock_t old;
+
+ /*
+ * Use the amoswap instruction to swap the lock value with
+ * a local variable containing the locked state.
+ */
+ __asm__("amoswap.w %0, %1, (%2)"
+ : "=r" (old)
+ : "r" (_ATOMIC_LOCK_LOCKED), "r" (lock) : "memory");
+
+ return (old != _ATOMIC_LOCK_UNLOCKED);
+}
--- /dev/null
+/* $OpenBSD: usertc.c,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Paul Irofti <paul@irofti.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/timetc.h>
+
+int (*const _tc_get_timecount)(struct timekeep *, u_int *) = NULL;
--- /dev/null
+SRCS += ntohl.c ntohs.c htons.c htonl.c
--- /dev/null
+/* $OpenBSD: Ovfork.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "SYS.h"
+
+SYSENTRY_HIDDEN(vfork)
+ RETGUARD_SETUP(vfork, t6)
+ mv a2, ra
+ SYSTRAP(vfork)
+ HANDLE_ERROR()
+ mv ra, a2
+ RETGUARD_CHECK(vfork, t6)
+ ret
+SYSCALL_END_HIDDEN(vfork)
--- /dev/null
+/* $OpenBSD: cerror.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*-
+ * Copyright (c) 2020 Mars Li <mengshi.li.mars@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "SYS.h"
+
+/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
+#define TCB_OFFSET_ERRNO (-12)
+
+_ENTRY(CERROR)
+ RETGUARD_SETUP(CERROR, t6)
+ sw a0, TCB_OFFSET_ERRNO(tp)
+ li a0, -1
+ RETGUARD_CHECK(CERROR, t6)
+ ret
+END(CERROR)
--- /dev/null
+/* $OpenBSD: sigpending.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "SYS.h"
+
+SYSENTRY(sigpending)
+ RETGUARD_SETUP(sigpending, t6)
+ mv a2, a0
+ SYSTRAP(sigpending)
+ HANDLE_ERROR()
+ sw a0, 0(a2) /* 4 bytes */
+ mv a0, x0
+ RETGUARD_CHECK(sigpending, t6)
+ ret
+SYSCALL_END(sigpending)
--- /dev/null
+/* $OpenBSD: sigprocmask.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "SYS.h"
+
+SYSENTRY_HIDDEN(sigprocmask)
+ RETGUARD_SETUP(sigprocmask, t6)
+ beqz a1, 1f
+ lw a1, (a1)
+ j 2f
+1:
+ li a0, 1
+ li a1, 0
+2:
+
+ SYSTRAP(sigprocmask)
+ HANDLE_ERROR()
+ beqz a2, 1f
+ sw a0, (a2)
+1:
+ mv a0, x0
+ RETGUARD_CHECK(sigprocmask, t6)
+ ret
+SYSCALL_END_HIDDEN(sigprocmask)
--- /dev/null
+/* $OpenBSD: sigsuspend.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "SYS.h"
+
+SYSENTRY_HIDDEN(sigsuspend)
+ RETGUARD_SETUP(sigsuspend, t6)
+ lw a0, (a0)
+ SYSTRAP(sigsuspend)
+ HANDLE_ERROR()
+ li a0, 0
+ RETGUARD_CHECK(sigsuspend, t6)
+ ret
+SYSCALL_END_HIDDEN(sigsuspend)
--- /dev/null
+/* $OpenBSD: syscall.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: @(#)syscall.s 5.1 (Berkeley) 4/23/90
+ */
+
+#include "SYS.h"
+
+RSYSCALL(syscall)
--- /dev/null
+/* $OpenBSD: tfork_thread.S,v 1.1 2021/04/29 18:33:36 drahn Exp $ */
+/*
+ * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "SYS.h"
+
+/*
+ * a0 a1 a2 a3
+ * __tfork_thread(param, psize, start_fnc, start_arg);
+ */
+
+ENTRY(__tfork_thread)
+ RETGUARD_SETUP(__tfork_thread, t6)
+ SYSTRAP(__tfork)
+ HANDLE_ERROR()
+
+ beqz a0, 1f
+ /* parent thread */
+ RETGUARD_CHECK(__tfork_thread, t6)
+ ret
+
+1: /* child thread */
+ mv a0, a3
+ jalr a2
+ SYSTRAP(__threxit)
+END(__tfork_thread)
projects / openbsd / commitdiff