Date: Fri, 2 Mar 2001 14:27:40 +0000 (GMT) From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net> To: freebsd-hackers@freebsd.org Subject: need help: mmap() / vm_map_stack() Message-ID: <Pine.LNX.4.20.0103021411210.12311-100000@www.everquick.net>
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Greetings,
This is something of a repost of an earlier question, but in a different
vein. I should mention that I'm using 4.2-R.
Has anyone modified vm_map_stack(), in /usr/src/sys/vm/vm_map.c, to search
for the first suitable open block?
I tried modifying vm_map_stack() based on vm_map_find(), but get:
* kernel panic upon boot ("Bad entry start/end for new stack entry")
* kernel panic when attempting to search for a block using mmap(MAP_STACK)
* _duplicate_ values returned when searching using mmap(MAP_STACK)
depending upon the exact code that I tried. I know that the first two
symptoms are when I made a fubar vm_map_stack(). I'm rather new to the
kernel code, so I'm sure that I'm doing something wrong...
For the last problem, I made certain that I had vm_map_lock()'ed, ran at
splvm()... same thing. I then sleep()'ed between mmap() calls... same
thing.
I've concluded that I need to learn more about vm_map_entry_t and friends,
but wanted to see if anyone had any suggestions before I went chasing the
wrong thing...
I'm almost tempted to try having vm_map_stack() call vm_map_find() with
size SGROWSIZ, shrink it to the initial size, then alter vm_map_entry_t
entries as needed based upon current vm_map_stack() code.
Advice? Just keep digging? :-)
Eddy
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