diff options
Diffstat (limited to 'lib/libc/arch/riscv64/sys/tfork_thread.S')
| -rw-r--r-- | lib/libc/arch/riscv64/sys/tfork_thread.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/libc/arch/riscv64/sys/tfork_thread.S b/lib/libc/arch/riscv64/sys/tfork_thread.S new file mode 100644 index 00000000000..16142761f5a --- /dev/null +++ b/lib/libc/arch/riscv64/sys/tfork_thread.S @@ -0,0 +1,52 @@ +/* $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) |