From a9520143df0d3db7f33b89dfae8a125fc5447307 Mon Sep 17 00:00:00 2001 From: alc Date: Fri, 27 Nov 2009 22:08:29 +0000 Subject: Support the new VM_PROT_COPY option on wired pages. The effect of which is that a debugger can now set a breakpoint in a program that uses mlock(2) on its text segment or mlockall(2) on its entire address space. --- sys/vm/vm_fault.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'sys/vm') diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index 0896cba..f1f13a6 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -273,7 +273,7 @@ RetryFault:; fs.lookup_still_valid = TRUE; if (wired) - fault_type = prot; + fault_type = prot | (fault_type & VM_PROT_COPY); fs.first_m = NULL; @@ -759,8 +759,11 @@ vnode_locked: */ pmap_copy_page(fs.m, fs.first_m); fs.first_m->valid = VM_PAGE_BITS_ALL; - } - if (fs.m) { + if (wired && (fault_flags & + VM_FAULT_CHANGE_WIRING) == 0) { + vm_page_wire(fs.first_m); + vm_page_unwire(fs.m, FALSE); + } /* * We no longer need the old page or object. */ -- cgit v1.1