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Support the new VM_PROT_COPY option on wired pages. The effect of which

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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.
This commit is contained in:
Alan Cox 2009-11-27 22:08:29 +00:00
parent e2997fea72
commit d8778512cf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=199869
1 changed files with 6 additions and 3 deletions
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9
sys/vm/vm_fault.c
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@ -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 @@ RetryFault:;
*/
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.
*/