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If we trap due to a bad kernel stack, try to switch to the interrupt strack 

before breaking into the debugger.
This commit is contained in:
eeh 2000-04-22 22:06:06 +00:00
parent 25d6f027de
commit 5099c60132
1 changed files with 21 additions and 1 deletions
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22
sys/arch/sparc64/sparc64/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.55 2000/04/18 02:12:25 eeh Exp $ */
/* $NetBSD: locore.s,v 1.56 2000/04/22 22:06:06 eeh Exp $ */
/*
* Copyright (c) 1996-1999 Eduardo Horvath
* Copyright (c) 1996 Paul Kranenburg
@ -2709,6 +2709,26 @@ winfixsave:
CHKPT(%g2,%g1,0x17)
! sir
#endif
!!
!! Here we managed to fault trying to access a kernel window
!! This is a bug. Switch to the interrupt stack if we aren't
!! there already and then trap into the debugger or panic.
!!
sethi %hi(_C_LABEL(eintstack)-BIAS), %g6
btst 1, %sp
bnz,pt %icc, 0f
mov %sp, %g1
add %sp, -BIAS, %g1
0:
or %g6, %lo(_C_LABEL(eintstack)-BIAS), %g6
set (_C_LABEL(eintstack)-_C_LABEL(intstack)), %g7 ! XXXXXXXXXX This assumes kernel addresses are unique from user addresses
sub %g6, %g1, %g2 ! Determine if we need to switch to intr stack or not
dec %g7 ! Make it into a mask
andncc %g2, %g7, %g0 ! XXXXXXXXXX This assumes kernel addresses are unique from user addresses */ \
movz %xcc, %g1, %g6 ! Stay on interrupt stack?
add %g6, -CCFSZ, %g6 ! Allocate a stack frame
mov %sp, %l6 ! XXXXX Save old stack pointer
mov %g6, %sp
ta 1; nop ! Enter debugger
NOTREACHED
1: