NetBSD/lib/libc/arch/powerpc/sys/__vfork14.S

/*	$NetBSD: __vfork14.S,v 1.2 1998/05/25 15:28:02 ws Exp $	*/

/*
 * pid = vfork();
 *
 * r4 == 0 in parent process, 1 in child process.
 * r3 == pid of child in parent, pid of parent in child.
 */

#include "SYS.h"

SYSCALL(__vfork14)
	addi	4,4,-1		# from 1 to 0 in child, 0 to -1 in parent
	and	3,3,4		# return 0 in child, pid in parent
	blr
Remove long obsolete copyright (should have been done before initial import) 1998-05-25 19:19:10 +04:00			`/* $NetBSD: __vfork14.S,v 1.2 1998/05/25 15:28:02 ws Exp $ */`
Add syscall stubs for __vfork14(). These are basically copies of Ovfork.S with the syscall numbers changed. Since 4.4BSD vfork(2) did not share address space, Ovfork.S could be changed to be identical to fork.S (modulo syscall numbers). __vfork14.S, however, needs to remain separate since with a shared address space, the stub needs to pre-decrement the stack and do an indirect jump to the return address, so that the shared stackframe is still there when the parent returns. (Obviously, this does not apply to systems which to not build stackframes on leaf calls.) 1998-01-04 23:58:08 +03:00
			`/*`
			`* pid = vfork();`
			`*`
			`* r4 == 0 in parent process, 1 in child process.`
			`* r3 == pid of child in parent, pid of parent in child.`
			`*/`

			`#include "SYS.h"`

			`SYSCALL(__vfork14)`
			`addi 4,4,-1 # from 1 to 0 in child, 0 to -1 in parent`
			`and 3,3,4 # return 0 in child, pid in parent`
			`blr`