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.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=199869
@ -273,7 +273,7 @@ RetryFault:;
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fs.lookup_still_valid = TRUE;
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if (wired)
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fault_type = prot;
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fault_type = prot | (fault_type & VM_PROT_COPY);
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fs.first_m = NULL;
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@ -759,8 +759,11 @@ RetryFault:;
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*/
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pmap_copy_page(fs.m, fs.first_m);
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fs.first_m->valid = VM_PAGE_BITS_ALL;
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}
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if (fs.m) {
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if (wired && (fault_flags &
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VM_FAULT_CHANGE_WIRING) == 0) {
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vm_page_wire(fs.first_m);
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vm_page_unwire(fs.m, FALSE);
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}
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/*
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* We no longer need the old page or object.
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*/
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