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When switching the thread from the processor, store %dr7 content

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into the pcb before disabling watchpoints. Otherwise, when the
thread is restored on a processor, watchpoints are still disabled.

Submitted by:	Tijl Coosemans <tijl coosemans org>
	(I would be much happier if Tijl commited this himself)
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2010-07-12 19:59:15 +00:00
parent a32e2a86af
commit aaa95ccb50
1 changed files with 1 additions and 1 deletions
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2
sys/amd64/amd64/cpu_switch.S
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@ -243,13 +243,13 @@ store_dr:
movq %dr2,%r13
movq %dr3,%r12
movq %dr6,%r11
andq $0x0000fc00, %rax /* disable all watchpoints */
movq %r15,PCB_DR0(%r8)
movq %r14,PCB_DR1(%r8)
movq %r13,PCB_DR2(%r8)
movq %r12,PCB_DR3(%r8)
movq %r11,PCB_DR6(%r8)
movq %rax,PCB_DR7(%r8)
andq $0x0000fc00, %rax /* disable all watchpoints */
movq %rax,%dr7
jmp done_store_dr