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cpu_switch: values in global registers are not preserved across function calls.

This commit is contained in:
pk 2003-11-07 14:54:29 +00:00
parent 71602f6ec9
commit d6565c303c
1 changed files with 7 additions and 3 deletions
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10
sys/arch/sparc/sparc/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.190 2003/10/15 07:49:41 pk Exp $ */
/* $NetBSD: locore.s,v 1.191 2003/11/07 14:54:29 pk Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -4953,6 +4953,10 @@ Lsw_load:
/* finally, enable traps and continue at splsched() */
wr %g2, IPL_SCHED << 8 , %psr ! psr = newpsr;
mov %g3, %l3 ! restore p and lastproc from globals
mov %g4, %l4 ! (globals will get clobbered by the
! sched_unlock_idle() below)
sethi %hi(_WANT_RESCHED), %o0 ! want_resched = 0;
#if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
/* Done with the run queues; release the scheduler lock */
@ -4968,14 +4972,14 @@ Lsw_load:
* On multi-processor machines, the context might have changed
* (e.g. by exec(2)) even if we pick up the same process here.
*/
subcc %g3, %g4, %l0 ! p == lastproc?
subcc %l3, %l4, %l0 ! p == lastproc?
#if !defined(MULTIPROCESSOR)
be Lsw_sameproc ! yes, context is still set for p
EMPTY
#endif
ld [%l3 + L_PROC], %o2 ! p = l->l_proc;
INCR(_C_LABEL(nswitchdiff)) ! clobbers %o0,%o1
ld [%g3 + L_PROC], %o2 ! p = l->l_proc;
ld [%o2 + P_VMSPACE], %o3 ! vm = p->p_vmspace;
ld [%o3 + VM_PMAP], %o3 ! pm = vm->vm_map.vm_pmap;
#if defined(MULTIPROCESSOR)