diff options
| author | Niklas Hallqvist <niklas@cvs.openbsd.org> | 1999-08-17 10:32:20 +0000 |
|---|---|---|
| committer | Niklas Hallqvist <niklas@cvs.openbsd.org> | 1999-08-17 10:32:20 +0000 |
| commit | d86a6c16672c6fd6de49e6c04095bbe180db8edf (patch) | |
| tree | d4538cad037bcb5ad1572a3d144628a50e829859 /sys/arch/powerpc | |
| parent | 63b7a98cc57e3a3fbf4e70bcd27a4eb65721c359 (diff) | |
New cpu_fork API to take a stack in which you point the child's stackpointer
to, at the bottom or the top, depending on your architecture's stack growth
direction. This is in preparation for Linux' clone(2) emulation.
port maintainers, please check that I did the work right.
Diffstat (limited to 'sys/arch/powerpc')
| -rw-r--r-- | sys/arch/powerpc/powerpc/vm_machdep.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/arch/powerpc/powerpc/vm_machdep.c b/sys/arch/powerpc/powerpc/vm_machdep.c index d43e13da067..9a25dae28ea 100644 --- a/sys/arch/powerpc/powerpc/vm_machdep.c +++ b/sys/arch/powerpc/powerpc/vm_machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: vm_machdep.c,v 1.6 1999/01/23 19:41:33 rahnds Exp $ */ +/* $OpenBSD: vm_machdep.c,v 1.7 1999/08/17 10:32:17 niklas Exp $ */ /* $NetBSD: vm_machdep.c,v 1.1 1996/09/30 16:34:57 ws Exp $ */ /* @@ -47,8 +47,10 @@ * Finish a fork operation, with process p2 nearly set up. */ void -cpu_fork(p1, p2) +cpu_fork(p1, p2, stack, stacksize) struct proc *p1, *p2; + void *stack; + size_t stacksize; { struct trapframe *tf; struct callframe *cf; @@ -71,6 +73,13 @@ cpu_fork(p1, p2) stktop1 = (caddr_t)trapframe(p1); stktop2 = (caddr_t)trapframe(p2); bcopy(stktop1, stktop2, sizeof(struct trapframe)); + + /* + * If specified, give the child a different stack. + */ + if (stack != NULL) + tf->fixreg[1] = (register_t)stack + stacksize; + stktop2 = (caddr_t)((u_long)stktop2 & ~15); /* Align stack pointer */ /* |