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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright 2000 Peter Wemm <peter@FreeBSD.org>
* Copyright 2026 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by
* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
* the FreeBSD Foundation.
*/
#include <machine/asm.h>
/*
* With thanks to John Dyson for the original version of this.
*/
#include <SYS.h>
/*
* 8 12 16 20 24 28
* rfork_thread(fdp, pdflags rfflags, stack_addr, start_fnc, start_arg);
*
* fdp Pointer for the resulting fd location
* pdflags Flags as to pdfork.
* rfflags: Flags as to rfork.
* 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(pdrfork_thread)
pushl %ebp
movl %esp, %ebp
pushl %esi
/*
* Push thread info onto the new thread's stack
*/
movl 20(%ebp), %esi # get stack addr
subl $4, %esi
movl 28(%ebp), %eax # get start argument
movl %eax, (%esi)
subl $4, %esi
movl 24(%ebp), %eax # get start thread address
movl %eax, (%esi)
/*
* Prepare and execute the thread creation syscall
*/
pushl 16(%ebp)
pushl 12(%ebp)
pushl 8(%ebp)
pushl $0
_SYSCALL(pdrfork)
jb 2f
/*
* Check to see if we are in the parent or child
*/
cmpl $0, %edx
jnz 1f
addl $16, %esp
popl %esi
movl %ebp, %esp
popl %ebp
ret
.p2align 2
/*
* If we are in the child (new thread), then
* set-up the call to the internal subroutine. If it
* returns, then call __exit.
*/
1:
movl %esi,%esp
popl %eax
call *%eax
addl $4, %esp
/*
* Exit system call
*/
pushl %eax
pushl $0
_SYSCALL(exit)
/*
* Branch here if the thread creation fails:
*/
2:
addl $16, %esp
popl %esi
movl %ebp, %esp
popl %ebp
jmp HIDENAME(cerror)
END(pdrfork_thread)
.section .note.GNU-stack,"",%progbits
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