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Adjust for the new "reaper" kernel thread: do not free the vmspace and

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u-area in machine-dependent code.  Instead, call exit2() to schedule
the reaper to free them for us, once it is safe to do so (i.e. we are
no longer running on the dead proc's vmspace and stack).
This commit is contained in:
thorpej 1998-09-09 00:07:48 +00:00
parent 93ea1946f0
commit 8abe0d6b1c
38 changed files with 224 additions and 431 deletions
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23
sys/arch/alpha/alpha/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.48 1998/05/19 18:35:11 thorpej Exp $ */
/* $NetBSD: locore.s,v 1.49 1998/09/09 00:07:48 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -33,7 +33,7 @@
#include <machine/asm.h>
__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.48 1998/05/19 18:35:11 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.49 1998/09/09 00:07:48 thorpej Exp $");
#ifndef EVCNT_COUNTERS
#include <machine/intrcnt.h>
@ -800,9 +800,10 @@ LEAF(switch_trampoline, 0)
/*
* switch_exit(struct proc *p)
* Make a the named process exit. Partially switch to proc0, unmap
* the old proc's user struct, and jump into the middle of cpu_switch
* to switch into a few process. MUST BE CALLED AT SPLHIGH.
* Make a the named process exit. Partially switch to proc0 (we don't
* update curproc or restore registers), and jump into the middle of
* cpu_switch to switch into a few process. The process reaper will
* free the dead process's VM resources. MUST BE CALLED AT SPLHIGH.
*/
LEAF(switch_exit, 1)
LDGP(pv)
@ -825,15 +826,9 @@ LEAF(switch_exit, 1)
* the saved regs.
*/
/* blow away the old user struct */
ldq a0, kernel_map
ldq a1, P_ADDR(s2)
ldiq a2, (UPAGES * NBPG)
#if defined(UVM)
CALL(uvm_km_free)
#else
CALL(kmem_free)
#endif
/* Schedule the vmspace and stack to be freed. */
mov s2, a0
CALL(exit2)
/*
* Now jump back into the middle of cpu_switch(). Note that

17
sys/arch/alpha/alpha/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.37 1998/08/14 16:50:02 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.38 1998/09/09 00:07:48 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -31,7 +31,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.37 1998/08/14 16:50:02 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.38 1998/09/09 00:07:48 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -108,10 +108,9 @@ cpu_coredump(p, vp, cred, chdr)
/*
* cpu_exit is called as the last action during exit.
* We release the address space of the process, block interrupts,
* and call switch_exit. switch_exit switches to proc0's PCB and stack,
* then jumps into the middle of cpu_switch, as if it were switching
* from proc0.
* We block interrupts and call switch_exit. switch_exit switches
* to proc0's PCB and stack, then jumps into the middle of cpu_switch,
* as if it were switching from proc0.
*/
void
cpu_exit(p)
@ -129,12 +128,6 @@ cpu_exit(p)
*/
pmap_deactivate(p);
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void) splhigh();
switch_exit(p);
/* NOTREACHED */

19
sys/arch/amiga/amiga/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.98 1998/07/10 20:24:05 mhitch Exp $ */
/* $NetBSD: locore.s,v 1.99 1998/09/09 00:07:49 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -1152,23 +1152,18 @@ pcbflag:
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's user area.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
movl #nullpcb,_curpcb | save state into garbage pcb
lea tmpstk,sp | goto a tmp stack
/* Free old process's user area. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address u-area of process
movl _kernel_map,sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _cpu_switch

14
sys/arch/amiga/amiga/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.37 1998/07/28 18:34:53 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.38 1998/09/09 00:07:49 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -135,21 +135,15 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
*
* Block context switches and then call switch_exit() which will
* free our stack and user area and switch to another process
* thus we never return.
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void)splhigh();
#if defined(UVM)
uvmexp.swtch++;

25
sys/arch/arm32/arm32/cpuswitch.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: cpuswitch.S,v 1.27 1998/08/16 02:17:17 mark Exp $ */
/* $NetBSD: cpuswitch.S,v 1.28 1998/09/09 00:07:49 thorpej Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -649,27 +649,10 @@ Lse_context_switched:
str r3, [sp, #-0x0004]!
/*
* Have to wait until we have switched to proc0 as the
* pmap gets released in vmspace_free()
* Schedule the vmspace and stack to be freed.
*/
ldr r0, [r3, #(P_VMSPACE)]
#if defined(UVM)
bl _uvmspace_free
#else
bl _vmspace_free
#endif
/* This has to be done here */
mov r2, #(UPAGES << PGSHIFT)
ldr r0, [sp], #0x0004
ldr r1, [r0, #(P_ADDR)]
ldr r0, Lkernel_map
ldr r0, [r0]
#if defined(UVM)
bl _uvm_km_free
#else
bl _kmem_free
#endif
mov r0, r3 /* exit2(p) */
bl _exit2
/* Paranoia */
mov r0, #0x00000000

8
sys/arch/arm32/arm32/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.29 1998/08/27 04:00:53 mark Exp $ */
/* $NetBSD: vm_machdep.c,v 1.30 1998/09/09 00:07:49 thorpej Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -193,10 +193,8 @@ cpu_set_kpc(p, pc)
* cpu_exit is called as the last action during exit.
*
* We clean up a little and then call switch_exit() with the old proc as an
* argument. switch_exit() first switches to proc0's context, then does the
* vmspace_free() and kmem_free() (or their UVM counterparts) that we don't
* do here, and finally jumps into switch() to wait for another process
* to wake up.
* argument. switch_exit() first switches to proc0's context, and finally
* jumps into switch() to wait for another process to wake up.
*/
void

19
sys/arch/atari/atari/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.52 1998/07/04 22:18:21 jonathan Exp $ */
/* $NetBSD: locore.s,v 1.53 1998/09/09 00:07:50 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -1103,23 +1103,18 @@ pcbflag:
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's user area.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
movl #nullpcb,_curpcb | save state into garbage pcb
lea tmpstk,sp | goto a tmp stack
/* Free old process's user area. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _kernel_map,sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _cpu_switch

14
sys/arch/atari/atari/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.18 1998/09/02 14:58:03 leo Exp $ */
/* $NetBSD: vm_machdep.c,v 1.19 1998/09/09 00:07:50 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -131,21 +131,15 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
*
* Block context switches and then call switch_exit() which will
* free our stack and user area and switch to another process
* thus we never return.
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void)splhigh();
#if defined(UVM)
uvmexp.swtch++;

17
sys/arch/bebox/bebox/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.7 1998/07/04 22:18:22 jonathan Exp $ */
/* $NetBSD: locore.s,v 1.8 1998/09/09 00:07:50 thorpej Exp $ */
/* $OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $ */
/*
@ -194,8 +194,7 @@ ASENTRY(Idle)
b _ASM_LABEL(Idle)
/*
* switchexit gets called from cpu_exit to free the user structure
* and kernel stack of the current process.
* switchexit gets called from cpu_exit to complete the exit procedure.
*/
ENTRY(switchexit)
/* First switch to the idle pcb/kernel stack */
@ -204,12 +203,12 @@ ENTRY(switchexit)
lis 7,_C_LABEL(curpcb)@ha
stw 6,_C_LABEL(curpcb)@l(7)
addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
/* Now free the old user structure (args are already in r3, r4, r5) */
#if defined(UVM)
bl _C_LABEL(uvm_km_free)
#else
bl _C_LABEL(kmem_free)
#endif
/*
* Schedule the vmspace and stack to be freed (the proc arg is
* already in r3).
*/
bl _C_LABEL(exit2)
/* Fall through to cpu_switch to actually select another proc */
li 3,0 /* indicate exited process */

19
sys/arch/hp300/hp300/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.87 1998/07/04 22:18:23 jonathan Exp $ */
/* $NetBSD: locore.s,v 1.88 1998/09/09 00:07:51 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -1195,7 +1195,8 @@ ASBSS(nullpcb,SIZEOF_PCB)
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
@ -1203,16 +1204,10 @@ ENTRY(switch_exit)
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
/* Free old process's resources. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _C_LABEL(cpu_switch)

18
sys/arch/hp300/hp300/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.42 1998/08/20 08:33:47 kleink Exp $ */
/* $NetBSD: vm_machdep.c,v 1.43 1998/09/09 00:07:51 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -116,24 +116,16 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call switch_exit, which switches to a temporary
* pcb and stack and never returns. We block memory allocation
* until switch_exit has made things safe again.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void) splimp();
(void) splhigh();
#if defined(UVM)
uvmexp.swtch++;
#else

27
sys/arch/i386/i386/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.199 1998/08/15 05:10:23 mycroft Exp $ */
/* $NetBSD: locore.s,v 1.200 1998/09/09 00:07:52 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -2111,24 +2111,15 @@ ENTRY(switch_exit)
/* Interrupts are okay again. */
sti
/* Thoroughly nuke the old process's resources. */
pushl P_ADDR(%edi)
/*
* Nuke the TSS and schedule the dead process's
* vmspace and stack to be freed.
*/
pushl P_ADDR(%edi) /* tss_free(p->p_addr) */
call _tss_free
pushl P_VMSPACE(%edi)
#if defined(UVM)
call _uvmspace_free
#else
call _vmspace_free
#endif
pushl $USPACE
pushl P_ADDR(%edi)
pushl _kernel_map
#if defined(UVM)
call _uvm_km_free
#else
call _kmem_free
#endif
addl $20,%esp
pushl %edi /* exit2(p) */
call _exit2
addl $8,%esp
/* Jump into cpu_switch() with the right state. */
movl %ebx,%esi

7
sys/arch/i386/i386/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.71 1998/08/13 21:36:04 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.72 1998/09/09 00:07:52 thorpej Exp $ */
/*-
* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
@ -188,9 +188,8 @@ cpu_swapout(p)
* cpu_exit is called as the last action during exit.
*
* We clean up a little and then call switch_exit() with the old proc as an
* argument. switch_exit() first switches to proc0's context, then does the
* vmspace_free() and uvm_km_free() that we don't do here, and finally jumps
* into switch() to wait for another process to wake up.
* argument. switch_exit() first switches to proc0's context, and finally
* jumps into switch() to wait for another process to wake up.
*/
void
cpu_exit(p)

19
sys/arch/mac68k/mac68k/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.106 1998/08/16 22:29:03 scottr Exp $ */
/* $NetBSD: locore.s,v 1.107 1998/09/09 00:07:52 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -1029,7 +1029,8 @@ ASBSS(nullpcb,SIZEOF_PCB)
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
@ -1037,16 +1038,10 @@ ENTRY(switch_exit)
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
/* Free old process's resources. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _C_LABEL(cpu_switch)

17
sys/arch/mac68k/mac68k/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.29 1998/07/28 18:34:55 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.30 1998/09/09 00:07:52 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -141,20 +141,14 @@ void switch_exit __P((struct proc *));
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* block context switches and then call switch_exit() which will
* free our stack and user area and switch to another process.
* Thus, we never return.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
volatile void
void
cpu_exit(p)
struct proc *p;
{
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void)splhigh();
#if defined(UVM)
@ -163,7 +157,6 @@ cpu_exit(p)
cnt.v_swtch++;
#endif
switch_exit(p);
for(;;); /* Get rid of a compile warning */
/* NOTREACHED */
}

17
sys/arch/macppc/macppc/locore.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.5 1998/07/21 17:53:50 tsubai Exp $ */
/* $NetBSD: locore.S,v 1.6 1998/09/09 00:07:53 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -278,8 +278,7 @@ ASENTRY(Idle)
b _ASM_LABEL(Idle)
/*
* switchexit gets called from cpu_exit to free the user structure
* and kernel stack of the current process.
* switchexit gets called from cpu_exit to complete the exit procedure.
*/
ENTRY(switchexit)
/* First switch to the idle pcb/kernel stack */
@ -288,12 +287,12 @@ ENTRY(switchexit)
lis 7,_C_LABEL(curpcb)@ha
stw 6,_C_LABEL(curpcb)@l(7)
addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
/* Now free the old user structure (args are already in r3, r4, r5) */
#if defined(UVM)
bl _C_LABEL(uvm_km_free)
#else
bl _C_LABEL(kmem_free)
#endif
/*
* Schedule the vmspace and stack to be freed (the proc arg is
* already in r3).
*/
bl _C_LABEL(exit2)
/* Fall through to cpu_switch to actually select another proc */
li 3,0 /* indicate exited process */

17
sys/arch/mips/mips/locore_r2000.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore_r2000.S,v 1.43 1998/03/12 05:45:05 thorpej Exp $ */
/* $NetBSD: locore_r2000.S,v 1.44 1998/09/09 00:07:53 thorpej Exp $ */
/*
* Copyright (c) 1992, 1993
@ -1617,9 +1617,9 @@ END(mips1_proc_trampoline)
/*
* switch_exit(struct proc *)
* Make the named process exit. Switch SP to nullproc stack, free the
* exiting proc's USPACE, then jump into the middle of cpu_switch().
* MUST BE CALLED AT SPLHIGH.
* Make the named process exit. Switch SP to nullproc stack, schedule
* the exiting proc's vmspace and stack to be freed, then jump into the
* middle of cpu_switch(). MUST BE CALLED AT SPLHIGH.
*/
LEAF(mips1_switch_exit)
la v1, _C_LABEL(nullproc) # !! SP runs on p->p_addr !!
@ -1651,15 +1651,8 @@ LEAF(mips1_switch_exit)
tlbwi # Write the TLB entry.
addu sp, v0, USPACE - START_FRAME
li a2, USPACE
lw a1, P_ADDR(a0)
lw a0, kernel_map
la ra, sw1 # goto cpu_switch()
#if defined(UVM)
j uvm_km_free # free exiting USPACE
#else
j kmem_free # free exiting USPACE
#endif
j exit2 # proc already in a0
END(mips1_switch_exit)
/*

17
sys/arch/mips/mips/locore_r4000.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore_r4000.S,v 1.43 1998/04/19 01:48:34 jonathan Exp $ */
/* $NetBSD: locore_r4000.S,v 1.44 1998/09/09 00:07:53 thorpej Exp $ */
/*
* Copyright (c) 1997 Jonathan Stone (hereinafter referred to as the author)
@ -2113,9 +2113,9 @@ END(mips3_proc_trampoline)
/*
* mips3_switch_exit(struct proc *)
* Make the named process exit. Switch SP to nullproc stack, free the
* exiting proc's USPACE, then jump into the middle of cpu_switch().
* MUST BE CALLED AT SPLHIGH.
* Make the named process exit. Switch SP to nullproc stack, schedule
* the exiting proc's vmspace and stack to be freed, then jump into the
* middle of cpu_switch(). MUST BE CALLED AT SPLHIGH.
*/
LEAF(mips3_switch_exit)
la v1, _C_LABEL(nullproc) # !! SP runs on p->p_addr !!
@ -2141,15 +2141,8 @@ LEAF(mips3_switch_exit)
tlbwi # Write the TLB entry.
addu sp, v0, USPACE - START_FRAME
li a2, USPACE
lw a1, P_ADDR(a0)
lw a0, kernel_map
la ra, sw1 # goto cpu_switch()
#if defined(UVM)
j uvm_km_free # free exiting USPACE
#else
j kmem_free # free exiting USPACE
#endif
j exit2 # proc already in a0
nop # XXX schedule better
END(mips3_switch_exit)

17
sys/arch/mips/mips/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.27 1998/09/02 06:41:22 nisimura Exp $ */
/* $NetBSD: vm_machdep.c,v 1.28 1998/09/09 00:07:53 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -43,7 +43,7 @@
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.27 1998/09/02 06:41:22 nisimura Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.28 1998/09/09 00:07:53 thorpej Exp $");
#include "opt_uvm.h"
@ -145,10 +145,11 @@ cpu_swapin(p)
/*
* cpu_exit is called as the last action during exit.
* We release the address space of the process, block interrupts,
* and call switch_exit. switch_exit switches to nullproc's PCB and stack,
* then jumps into the middle of cpu_switch, as if it were switching
* from nullproc.
*
* We clean up a little and then call switch_exit() with the old proc as an
* argument. switch_exit() first switches to nullproc's PCB and stack,
* schedules the dead proc's vmspace and stack to be freed, then jumps
* into the middle of cpu_switch(), as if it were switching from nullproc.
*/
void
cpu_exit(p)
@ -158,12 +159,8 @@ cpu_exit(p)
fpcurproc = (struct proc *)0;
#if defined(UVM)
uvmspace_free(p->p_vmspace);
uvmexp.swtch++;
#else
vmspace_free(p->p_vmspace);
cnt.v_swtch++;
#endif
(void)splhigh();

19
sys/arch/mvme68k/mvme68k/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.38 1998/08/16 15:33:48 scw Exp $ */
/* $NetBSD: locore.s,v 1.39 1998/09/09 00:07:54 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -969,23 +969,18 @@ mdpflag:
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
movl #nullpcb,_curpcb | save state into garbage pcb
lea tmpstk,sp | goto a tmp stack
/* Free old process's resources. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _kernel_map,sp@- | map it was allocated in
#ifdef UVM
jbsr _uvm_km_free | deallocate it
#else
jbsr _kmem_free | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _cpu_switch

16
sys/arch/mvme68k/mvme68k/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.15 1998/08/22 10:55:36 scw Exp $ */
/* $NetBSD: vm_machdep.c,v 1.16 1998/09/09 00:07:54 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -117,23 +117,15 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call switch_exit, which switches to a temporary
* pcb and stack and never returns. We block memory allocation
* until switch_exit has made things safe again.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#ifdef UVM
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void) splhigh();
#ifdef UVM
uvmexp.swtch++;

15
sys/arch/next68k/next68k/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.3 1998/08/28 22:47:12 dbj Exp $ */
/* $NetBSD: locore.s,v 1.4 1998/09/09 00:07:54 thorpej Exp $ */
/*
* Copyright (c) 1998 Darrin B. Jewell
@ -1113,7 +1113,8 @@ ASBSS(nullpcb,SIZEOF_PCB)
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
@ -1121,12 +1122,10 @@ ENTRY(switch_exit)
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
/* Free old process's resources. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
jbsr _C_LABEL(kmem_free) | deallocate it
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _C_LABEL(cpu_switch)

16
sys/arch/next68k/next68k/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.3 1998/08/28 23:05:55 dbj Exp $ */
/* $NetBSD: vm_machdep.c,v 1.4 1998/09/09 00:07:54 thorpej Exp $ */
/*
* This file was taken from from mvme68k/mvme68k/vm_machdep.c
@ -126,23 +126,15 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call switch_exit, which switches to a temporary
* pcb and stack and never returns. We block memory allocation
* until switch_exit has made things safe again.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#ifdef UVM
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void) splhigh();
#ifdef UVM
uvmexp.swtch++;

17
sys/arch/ofppc/ofppc/locore.S
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.8 1998/07/04 22:18:34 jonathan Exp $ */
/* $NetBSD: locore.S,v 1.9 1998/09/09 00:07:54 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -255,8 +255,7 @@ ASENTRY(Idle)
b _ASM_LABEL(Idle)
/*
* switchexit gets called from cpu_exit to free the user structure
* and kernel stack of the current process.
* switchexit gets called from cpu_exit to complete the exit procedure.
*/
ENTRY(switchexit)
/* First switch to the idle pcb/kernel stack */
@ -265,12 +264,12 @@ ENTRY(switchexit)
lis 7,_C_LABEL(curpcb)@ha
stw 6,_C_LABEL(curpcb)@l(7)
addi 1,6,USPACE-16 /* 16 bytes are reserved at stack top */
/* Now free the old user structure (args are already in r3, r4, r5) */
#if defined(UVM)
bl _C_LABEL(uvm_km_free)
#else
bl _C_LABEL(kmem_free)
#endif
/*
* Schedule the vmspace and stack to be freed (the proc arg is
* already in r3).
*/
bl _C_LABEL(exit2)
/* Fall through to cpu_switch to actually select another proc */
li 3,0 /* indicate exited process */

21
sys/arch/pc532/pc532/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.27 1998/09/02 19:17:21 matthias Exp $ */
/* $NetBSD: vm_machdep.c,v 1.28 1998/09/09 00:07:54 thorpej Exp $ */
/*-
* Copyright (c) 1996 Matthias Pfaller.
@ -159,11 +159,9 @@ cpu_swapout(p)
/*
* cpu_exit is called as the last action during exit.
*
* We switch to a temorary stack and address space. Then we release
* release the original address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call cpu_exit, which never returns.
* We block interrupts until cpu_switch has made things safe again.
* We clean up a little and then call switch_exit() with the old proc as an
* argument. switch_exit() first switches to proc0's context, and finally
* jumps into switch() to wait for another process to wake up.
*/
void
cpu_exit(arg)
@ -188,16 +186,9 @@ cpu_exit(arg)
lprd(sp, INTSTACK);
load_ptb(proc0paddr->u_pcb.pcb_ptb);
/* Free resources. */
#if defined(UVM)
uvmspace_free(p->p_vmspace);
/* Schedule the vmspace and stack to be freed. */
(void) splhigh();
uvm_km_free(kernel_map, (vaddr_t)p->p_addr, USPACE);
#else
vmspace_free(p->p_vmspace);
(void) splhigh();
kmem_free(kernel_map, (vaddr_t)p->p_addr, USPACE);
#endif
exit2(p);
/* Don't update pcb in cpu_switch. */
curproc = NULL;

18
sys/arch/powerpc/powerpc/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.4 1998/08/31 14:43:41 tsubai Exp $ */
/* $NetBSD: vm_machdep.c,v 1.5 1998/09/09 00:07:55 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -154,12 +154,11 @@ pagemove(from, to, size)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
*
* Since we don't have curproc anymore, we cannot sleep, and therefor
* this is at least incorrect for the multiprocessor version.
* Not sure whether we can get away with this in the single proc version. XXX
* We clean up a little and then call switchexit() with the old proc
* as an argument. switchexit() switches to the idle context, schedules
* the old vmspace and stack to be freed, then selects a new process to
* run.
*/
void
cpu_exit(p)
@ -168,12 +167,7 @@ cpu_exit(p)
if (p == fpuproc) /* release the fpu */
fpuproc = 0;
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
switchexit(kernel_map, p->p_addr, USPACE);
switchexit(p);
}
/*

4
sys/arch/sparc/include/pmap.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.h,v 1.34 1998/08/21 14:12:18 pk Exp $ */
/* $NetBSD: pmap.h,v 1.35 1998/09/09 00:07:55 thorpej Exp $ */
/*
* Copyright (c) 1996
@ -265,7 +265,7 @@ void pmap_virtual_space __P((vaddr_t *, vaddr_t *));
void pmap_redzone __P((void));
void kvm_uncache __P((caddr_t, int));
struct user;
void switchexit __P((vm_map_t, struct user *, int));
void switchexit __P((struct proc *));
int mmu_pagein __P((struct pmap *pm, int, int));
void pmap_writetext __P((unsigned char *, int));

19
sys/arch/sparc/sparc/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.87 1998/09/06 21:18:59 pk Exp $ */
/* $NetBSD: locore.s,v 1.88 1998/09/09 00:07:55 thorpej Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -4329,15 +4329,14 @@ ENTRY(write_user_windows)
/*
* switchexit is called only from cpu_exit() before the current process
* has freed its kernel stack; we must free it. (curproc is already NULL.)
* has freed its vmspace and kernel stack; we must schedule them to be
* freed. (curproc is already NULL.)
*
* We lay the process to rest by changing to the `idle' kernel stack,
* and note that the `last loaded process' is nonexistent.
*/
ENTRY(switchexit)
mov %o0, %g2 ! save the
mov %o1, %g3 ! ... three parameters
mov %o2, %g4 ! ... to kmem_free
mov %o0, %g2 ! save proc for exit2() call
/*
* Change pcb to idle u. area, i.e., set %sp to top of stack
@ -4359,14 +4358,8 @@ ENTRY(switchexit)
SET_SP_REDZONE(%l6, %l5)
#endif
wr %g0, PSR_S|PSR_ET, %psr ! and then enable traps
mov %g2, %o0 ! now ready to call kmem_free
mov %g3, %o1
#if defined(UVM)
call _uvm_km_free
#else
call _kmem_free
#endif
mov %g4, %o2
call _exit2 ! exit2(p)
mov %g2, %o0
/*
* Now fall through to `the last switch'. %g6 was set to

18
sys/arch/sparc/sparc/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.38 1998/08/21 14:13:56 pk Exp $ */
/* $NetBSD: vm_machdep.c,v 1.39 1998/09/09 00:07:55 thorpej Exp $ */
/*
* Copyright (c) 1996
@ -312,10 +312,11 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Since the latter is also the interrupt stack, we release it
* from assembly code after switching to a temporary pcb+stack.
*
* We clean up a little and then call switchexit() with the old proc
* as an argument. switchexit() switches to the idle context, schedules
* the old vmspace and stack to be freed, then selects a new process to
* run.
*/
void
cpu_exit(p)
@ -330,12 +331,7 @@ cpu_exit(p)
}
free((void *)fs, M_SUBPROC);
}
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
switchexit(kernel_map, p->p_addr, USPACE);
switchexit(p);
/* NOTREACHED */
}

6
sys/arch/sparc64/include/pmap.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.h,v 1.5 1998/08/30 15:32:17 eeh Exp $ */
/* $NetBSD: pmap.h,v 1.6 1998/09/09 00:07:56 thorpej Exp $ */
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -165,8 +165,8 @@ int pmap_dumpsize __P((void));
int pmap_dumpmmu __P((int (*)__P((dev_t, daddr_t, caddr_t, size_t)),
daddr_t));
int pmap_pa_exists __P((paddr_t));
struct user;
void switchexit __P((vm_map_t, struct user *, int));
struct proc;
void switchexit __P((struct proc *));
/* SPARC64 specific */
int ctx_alloc __P((struct pmap*));

17
sys/arch/sparc64/sparc64/locore.s
View File

@ -6500,7 +6500,8 @@ _C_LABEL(masterpaddr):
/*
* switchexit is called only from cpu_exit() before the current process
* has freed its kernel stack; we must free it. (curproc is already NULL.)
* has freed its vmspace and kernel stack; we must schedule them to be
* freed. (curproc is already NULL.)
*
* We lay the process to rest by changing to the `idle' kernel stack,
* and note that the `last loaded process' is nonexistent.
@ -6513,9 +6514,7 @@ ENTRY(switchexit)
restore
#endif
wrpr %g0, PSTATE_KERN, %pstate ! Make sure we're on the right globals
mov %o0, %g2 ! save the
mov %o1, %g3 ! ... three parameters
mov %o2, %g4 ! ... to kmem_free
mov %o0, %g2 ! save proc arg for exit2() call
#ifdef NOTDEF_DEBUG
save %sp, -CC64FSZ, %sp
@ -6573,14 +6572,8 @@ ENTRY(switchexit)
SET_SP_REDZONE(%l6, %l5)
#endif
wrpr %g0, PSTATE_INTR, %pstate ! and then enable traps
mov %g2, %o0 ! now ready to call kmem_free
mov %g3, %o1
#if defined(UVM)
call _C_LABEL(uvm_km_free)
#else
call _C_LABEL(kmem_free)
#endif
mov %g4, %o2
call _C_LABEL(exit2) ! exit2(p)
mov %g2, %o0
/*
* Now fall through to `the last switch'. %g6 was set to

18
sys/arch/sparc64/sparc64/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.8 1998/09/06 21:53:43 eeh Exp $ */
/* $NetBSD: vm_machdep.c,v 1.9 1998/09/09 00:07:56 thorpej Exp $ */
/*
* Copyright (c) 1996
@ -379,10 +379,11 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Since the latter is also the interrupt stack, we release it
* from assembly code after switching to a temporary pcb+stack.
*
* We clean up a little and then call switchexit() with the old proc
* as an argument. switchexit() switches to the idle context, schedules
* the old vmspace and stack to be freed, then selects a new process to
* run.
*/
void
cpu_exit(p)
@ -397,12 +398,7 @@ cpu_exit(p)
}
free((void *)fs, M_SUBPROC);
}
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
switchexit(kernel_map, p->p_addr, USPACE);
switchexit(p);
/* NOTREACHED */
}

22
sys/arch/sun3/sun3/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.60 1998/06/08 20:47:46 gwr Exp $ */
/* $NetBSD: locore.s,v 1.61 1998/09/09 00:07:56 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -630,26 +630,20 @@ ASBSS(nullpcb,SIZEOF_PCB)
/*
* At exit of a process, do a cpu_switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* The ipl is high enough to prevent the memory from being reallocated.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0 | struct proc *p
| save state into garbage pcb
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
movl a0,sp@- | pass proc ptr down
/* Free old process's u-area. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
/* Don't pop the proc; pass it to cpu_switch(). */
jra _C_LABEL(cpu_switch)

15
sys/arch/sun3/sun3/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.43 1998/07/28 18:34:58 thorpej Exp $ */
/* $NetBSD: vm_machdep.c,v 1.44 1998/09/09 00:07:57 thorpej Exp $ */
/*
* Copyright (c) 1994, 1995 Gordon W. Ross
@ -63,7 +63,6 @@
/* XXX - Gratuitous name changes... */
#define kmem_alloc_wait uvm_km_valloc_wait
#define kmem_free_wakeup uvm_km_free_wakeup
#define vmspace_free uvmspace_free
#endif /* UVM */
#include <machine/cpu.h>
@ -188,20 +187,16 @@ cpu_set_kpc(proc, func)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call switch_exit, which switches to a temporary
* pcb and stack and never returns. We block memory allocation
* until switch_exit has made things safe again.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
vmspace_free(p->p_vmspace);
(void) splimp();
(void) splhigh();
#if defined(UVM)
uvmexp.swtch++;
#else

22
sys/arch/sun3/sun3x/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.27 1998/06/09 20:47:17 gwr Exp $ */
/* $NetBSD: locore.s,v 1.28 1998/09/09 00:07:57 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -649,26 +649,20 @@ ASBSS(nullpcb,SIZEOF_PCB)
/*
* At exit of a process, do a cpu_switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* The ipl is high enough to prevent the memory from being reallocated.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0 | struct proc *p
| save state into garbage pcb
movl #_ASM_LABEL(nullpcb),_C_LABEL(curpcb)
lea _ASM_LABEL(tmpstk),sp | goto a tmp stack
movl a0,sp@- | pass proc ptr down
/* Free old process's u-area. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
/* Don't pop the proc; pass it to cpu_switch(). */
jra _C_LABEL(cpu_switch)

24
sys/arch/vax/vax/subr.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: subr.s,v 1.25 1998/07/04 22:18:45 jonathan Exp $ */
/* $NetBSD: subr.s,v 1.26 1998/09/09 00:09:19 thorpej Exp $ */
/*
* Copyright (c) 1994 Ludd, University of Lule}, Sweden.
@ -265,23 +265,13 @@ noque: .asciz "swtch"
#
ENTRY(cpu_exit,0)
movl 4(ap),r6 # Process pointer in r0
pushl P_VMSPACE(r6) # free current vm space
#if defined(UVM)
calls $1,_uvmspace_free
#else
calls $1,_vmspace_free
#endif
movl 4(ap),r6 # Process pointer in r6
mtpr $0x18,$PR_IPL # Block almost everything
addl3 $512,_scratch,sp # Change stack, we will free it now
pushl $USPACE # stack size
pushl P_ADDR(r6) # pointer to stack space
pushl _kernel_map # the correct vm map
#if defined(UVM)
calls $3,_uvm_km_free
#else
calls $3,_kmem_free
#endif
addl3 $512,_scratch,sp # Change stack, and schedule it to be freed
pushl r6 # exit2(p)
calls $1,_exit2
clrl r0 # No process to switch from
bicl3 $0xc0000000,_scratch,r1
mtpr r1,$PR_PCBB

19
sys/arch/x68k/x68k/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.32 1998/09/07 14:14:34 minoura Exp $ */
/* $NetBSD: locore.s,v 1.33 1998/09/09 00:09:19 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -1261,23 +1261,18 @@ mdpflag:
/*
* At exit of a process, do a switch for the last time.
* Switch to a safe stack and PCB, and deallocate the process's resources.
* Switch to a safe stack and PCB, and select a new process to run. The
* old stack and u-area will be freed by the reaper.
*/
ENTRY(switch_exit)
movl sp@(4),a0
movl #nullpcb,_curpcb | save state into garbage pcb
lea tmpstk,sp | goto a tmp stack
/* Free old process's resources. */
movl #USPACE,sp@- | size of u-area
movl a0@(P_ADDR),sp@- | address of process's u-area
movl _C_LABEL(kernel_map),sp@- | map it was allocated in
#if defined(UVM)
jbsr _C_LABEL(uvm_km_free) | deallocate it
#else
jbsr _C_LABEL(kmem_free) | deallocate it
#endif
lea sp@(12),sp | pop args
/* Schedule the vmspace and stack to be freed. */
movl a0,sp@- | exit2(p)
jbsr _C_LABEL(exit2)
lea sp@(4),sp | pop args
jra _C_LABEL(cpu_switch)

18
sys/arch/x68k/x68k/vm_machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.12 1998/08/22 14:38:41 minoura Exp $ */
/* $NetBSD: vm_machdep.c,v 1.13 1998/09/09 00:09:19 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -116,24 +116,16 @@ cpu_set_kpc(p, pc)
/*
* cpu_exit is called as the last action during exit.
* We release the address space and machine-dependent resources,
* including the memory for the user structure and kernel stack.
* Once finished, we call switch_exit, which switches to a temporary
* pcb and stack and never returns. We block memory allocation
* until switch_exit has made things safe again.
*
* Block context switches and then call switch_exit() which will
* switch to another process thus we never return.
*/
void
cpu_exit(p)
struct proc *p;
{
#if defined(UVM)
uvmspace_free(p->p_vmspace);
#else
vmspace_free(p->p_vmspace);
#endif
(void) splimp();
(void) splhigh();
#if defined(UVM)
uvmexp.swtch++;
#else