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Sharpening the saw:

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o   Clobber the register that holds the restart token immediately after
    crossing the restart point. This prevents false positives (i.e. a
    nested exception that we don't know can happen and that is being
    treated as one we know by virtue of a lingering restart token).
o   Now that the bootstrap kernel stack is free, switch onto it and call
    trap() for nested traps that we don't know about. In trap we panic()
    so that we can analyze the condition.
This commit is contained in:
Marcel Moolenaar 2011-05-14 14:47:19 +00:00
parent 5891ebd6cd
commit 65385d6d79
1 changed files with 12 additions and 8 deletions
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20
sys/ia64/ia64/exception.S
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@ -202,13 +202,13 @@ exception_save_restart:
{ .mmi
st8 [r30]=r19,16 // length
st8 [r31]=r0,16 // flags
add r19=16,r19
add r29=16,r19 // Clobber restart token
;;
}
{ .mmi
st8.spill [r30]=sp,16 // sp
st8 [r31]=r20,16 // unat
sub sp=r23,r19
sub sp=r23,r29
;;
}
{ .mmi
@ -641,7 +641,7 @@ exception_restore_restart:
mov r30=ar.bspstore
;;
loadrs // load user regs
nop 0
mov r29=0 // Clobber restart token
;;
}
{ .mmi
@ -1094,22 +1094,26 @@ IVT_ENTRY(Data_Nested_TLB, 0x1400)
}
{ .mlx
mov r26=ar.bsp
movl r27=kstack
movl r29=kstack
;;
}
{ .mmi
{ .mlx
mov r28=sp
nop 0
addl r27=KSTACK_PAGES*PAGE_SIZE-16,r0
movl r27=kstack_top
;;
}
{ .mmi
mov sp=r27
add sp=-16,r27
;;
mov r27=ar.bspstore
nop 0
;;
}
mov ar.rsc=0
dep r29=r27,r29,0,9
;;
mov ar.bspstore=r29
;;
CALL(trap, 5, r30)
IVT_END(Data_Nested_TLB)