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Make sure to restore SR 0 since returning from a syscall is actually 

one way of doing a process context switch.
This commit is contained in:
matt 2001-08-30 22:00:48 +00:00
parent a140263932
commit 4a580ee45e
1 changed files with 5 additions and 1 deletions
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6
sys/arch/powerpc/powerpc/trap_subr.S
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@ -1,4 +1,4 @@
/* $NetBSD: trap_subr.S,v 1.10 2001/06/30 01:24:13 matt Exp $ */
/* $NetBSD: trap_subr.S,v 1.11 2001/08/30 22:00:48 matt Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -542,6 +542,8 @@ _C_LABEL(ipkdbsize) = .-_C_LABEL(ipkdblow)
/* Restore user & kernel access SR: */ \
lis 2,_C_LABEL(curpm)@ha; /* get real address of pmap */ \
lwz 2,_C_LABEL(curpm)@l(2); \
lwz 3,PM_SR+0(2); \
mtsr 0,3; /* restore SR0 */ \
lwz 3,PM_SR+4(2); \
mtsr 1,3; /* restore SR1 */ \
lwz 3,PM_SR+8(2); \
@ -805,6 +807,8 @@ intr_exit:
bc 4,17,1f /* branch if PSL_PR is false */
lis 3,_C_LABEL(curpm)@ha /* get current pmap real address */
lwz 3,_C_LABEL(curpm)@l(3)
lwz 4,PM_SR+0(3)
mtsr 0,4 /* Restore SR0 */
lwz 4,PM_SR+4(3)
mtsr 1,4 /* Restore SR1 */
lwz 4,PM_SR+8(3)