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This commit is contained in:
Frans Kaashoek 2018-09-29 09:05:25 -04:00
parent 3bfcaeaf01
commit 572e106e6f
1 changed files with 5 additions and 2 deletions
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7
trapasm.S
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@ -2,6 +2,9 @@
#include "x86.h"
#include "mmu.h"
# the offset of cs in trapframe (i.e., tf->cs - tf)
#define CSOFF 144
# vectors.S sends all traps here.
.globl alltraps
alltraps:
@ -22,7 +25,7 @@ alltraps:
push %rbx
push %rax
cmpw $KCSEG, 144(%rsp) # compare to saved cs
cmpw $KCSEG, CSOFF(%rsp) # compare to saved cs
jz 1f
swapgs
@ -33,7 +36,7 @@ alltraps:
.globl trapret
trapret:
cli
cmpw $KCSEG, 144(%rsp) # compare to saved cs
cmpw $KCSEG, CSOFF(%rsp) # compare to saved cs
jz 1f
swapgs