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Duh, to set the user stack pointer, you have to frob the PALcode PCB,

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not the trap frame.

Fixes clone(2) on the Alpha.
This commit is contained in:
thorpej 2001-07-18 22:22:49 +00:00
parent 6af9e1cf38
commit 09ab6c5da8
1 changed files with 7 additions and 9 deletions
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16
sys/arch/alpha/alpha/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.71 2001/07/15 21:57:01 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.72 2001/07/18 22:22:49 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -29,7 +29,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.71 2001/07/15 21:57:01 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.72 2001/07/18 22:22:49 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -161,9 +161,13 @@ cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
/*
* Copy pcb and user stack pointer from proc p1 to p2.
* If specificed, give the child a different stack.
*/
p2->p_addr->u_pcb = p1->p_addr->u_pcb;
p2->p_addr->u_pcb.pcb_hw.apcb_usp = alpha_pal_rdusp();
if (stack != NULL)
p2->p_addr->u_pcb.pcb_hw.apcb_usp = (u_long)stack + stacksize;
else
p2->p_addr->u_pcb.pcb_hw.apcb_usp = alpha_pal_rdusp();
simple_lock_init(&p2->p_addr->u_pcb.pcb_fpcpu_slock);
/*
@ -204,12 +208,6 @@ cpu_fork(struct proc *p1, struct proc *p2, void *stack, size_t stacksize,
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child */
/*
* If specificed, give the child a different stack.
*/
if (stack != NULL)
p2tf->tf_regs[FRAME_SP] = (u_long)stack + stacksize;
up->u_pcb.pcb_hw.apcb_ksp = (u_int64_t)p2tf;
up->u_pcb.pcb_context[0] =
(u_int64_t)func; /* s0: pc */