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- /*-
- * Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
- * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
- */
- #include <machine/asm.h>
- #include <sys/syscall.h>
- /*
- * With thanks to John Dyson for the original version of this.
- */
- /*
- * %edi %rsi %rdx %rcx
- * rfork_thread(flags, stack_addr, start_fnc, start_arg);
- *
- * flags: Flags to rfork system call. See rfork(2).
- * stack_addr: Top of stack for thread.
- * start_fnc: Address of thread function to call in child.
- * start_arg: Argument to pass to the thread function in child.
- */
- ENTRY(rfork_thread)
- pushq %rbx
- pushq %r12
- movq %rdx, %rbx
- movq %rcx, %r12
- /*
- * Prepare and execute the thread creation syscall
- */
- movq $SYS_rfork, %rax
- int $0x80
- jb 2f
- /*
- * Check to see if we are in the parent or child
- */
- cmpl $0, %edx
- jnz 1f
- popq %r12
- popq %rbx
- ret
- /*
- * If we are in the child (new thread), then
- * set-up the call to the internal subroutine. If it
- * returns, then call __exit.
- */
- 1:
- movq %rsi, %rsp
- movq %r12, %rdi
- call *%rbx
- movl %eax, %edi
- /*
- * Exit system call
- */
- #ifdef SYS_exit
- movq $SYS_exit, %rax
- #else
- movq $SYS_sys_exit, %rax
- #endif
- int $0x80
- /*
- * Branch here if the thread creation fails:
- */
- 2:
- popq %r12
- popq %rbx
- /*
- * Exit if error during fork
- */
- #ifdef SYS_exit
- movq $SYS_exit, %rax
- #else
- movq $SYS_sys_exit, %rax
- #endif
- int $0x80
-
- END(rfork_thread)
- .section .note.GNU-stack,"",%progbits
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