pc/pc64: reset DR7 in mmurelease

2 files changed, 4 insertions, 0 deletions

diff --git a/sys/src/9/pc/mmu.c b/sys/src/9/pc/mmu.c
index 2e77aaee7..dc8546f6f 100644
--- a/sys/src/9/pc/mmu.c
+++ b/sys/src/9/pc/mmu.c
@@ -387,6 +387,8 @@ mmurelease(Proc* proc)
 		proc->ldt = nil;
 		proc->nldt = 0;
 	}
+	if(proc->dr[7] != 0)
+		putdr7(0);
 }
 
 /*
diff --git a/sys/src/9/pc64/mmu.c b/sys/src/9/pc64/mmu.c
index 6f27ac25e..19828eafc 100644
--- a/sys/src/9/pc64/mmu.c
+++ b/sys/src/9/pc64/mmu.c
@@ -425,6 +425,8 @@ mmurelease(Proc *proc)
 		proc->kmapcount = proc->kmapindex = 0;
 	}
 	mmufree(proc);
+	if(proc->dr[7] != 0)
+		putdr7(0);
 	taskswitch((uintptr)m+MACHSIZE);
 }