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/arm32 | |
| 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/arm32')
| -rw-r--r-- | sys/arch/arm32/arm32/vm_machdep.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/arch/arm32/arm32/vm_machdep.c b/sys/arch/arm32/arm32/vm_machdep.c index 46c6517715d..7339a636b17 100644 --- a/sys/arch/arm32/arm32/vm_machdep.c +++ b/sys/arch/arm32/arm32/vm_machdep.c @@ -103,9 +103,11 @@ extern void child_return __P(()); */ void -cpu_fork(p1, p2) +cpu_fork(p1, p2, stack, stacksize) struct proc *p1; struct proc *p2; + void *stack; + size_t stacksize; { struct user *up = p2->p_addr; struct pcb *pcb = (struct pcb *)&p2->p_addr->u_pcb; @@ -238,6 +240,13 @@ cpu_fork(p1, p2) p2->p_md.md_regs = tf = (struct trapframe *)pcb->pcb_sp - 1; *tf = *p1->p_md.md_regs; + + /* + * If specified, give the child a different stack. + */ + if (stack != NULL) + tf->tf_usr_sp = (u_int)stack + stacksize; + sf = (struct switchframe *)tf - 1; sf->sf_spl = SPL_0; sf->sf_r4 = (u_int)child_return; |