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Xsyscall: save %es before enabling interrupts. otherwise it can be 

clobbered by preemption.  PR/43903.
This commit is contained in:
yamt 2010-10-21 11:39:45 +00:00
parent c97e27eb0e
commit cc2d727ec3
1 changed files with 3 additions and 3 deletions
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6
sys/arch/amd64/amd64/locore.S
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@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.58 2010/07/07 01:14:52 chs Exp $ */
/* $NetBSD: locore.S,v 1.59 2010/10/21 11:39:45 yamt Exp $ */
/*
* Copyright-o-rama!
@ -1085,12 +1085,12 @@ IDTVEC(syscall)
pushq $(LSEL(LUDATA_SEL, SEL_UPL)) /* Known to be user ss */
pushq %r15 /* User space rsp */
movq CPUVAR(SCRATCH),%r15
sti
subq $TF_REGSIZE+(TF_RSP-TF_TRAPNO),%rsp
movw %es,TF_ES(%rsp)
sti
INTR_SAVE_GPRS
movw %fs,TF_FS(%rsp)
movw %gs,TF_GS(%rsp)
movw %es,TF_ES(%rsp)
movw $(LSEL(LUDATA_SEL, SEL_UPL)),TF_DS(%rsp)
movq %r11, TF_RFLAGS(%rsp) /* old rflags from syscall insn */
movq $(LSEL(LUCODE_SEL, SEL_UPL)), TF_CS(%rsp)