Fwd: Re: FreeBSD and wine mmap [PATCH]

[Jonathan Fosburgh]

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This was posted to -current@ last night.  I have not tried this on DFly since 
I imagine it will not apply cleanly as-is, and I don't trust my skills enough 
to try it. :) Hopefully, this will be of use to someone else.  I am more than 
willing to test.

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Subject: Re: FreeBSD and wine mmap [PATCH]
Date: Wednesday 18 August 2004 20:51
From: Anish Mistry <mistry.7 at xxxxxxx>

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Ok, I've got a patches that are against 4-STABLE and 6-CURRENT.  This fixes
the mmap function so that if the upper process address space is already
mmap'd it will start from the bottom and work it's way up.  There is probably
a much better way than the simple linear search(expensive, but not too bad
with the new findspace implementation), but not being a VM person I don't
know.
This allows wine and possibly other applications to behave how they need to.
I haven't noticed any issues on either my 4.x or 6.x system.

Now for the wine stuff.  The 4.x patch allows for the june version of wine to
work, but newer versions seem to die with weird sig_action signals.  The 6.x
patch allows wine to get to the point where it threads then dies with pthread
errors about not being able to allocate the "red zone" I hacked up libpthread
just to see what would happen if we can get passed this, and wine works
nicely, but the libpthread changes broke other apps so we should probably
just stick with mmap change and some modifications to the wine code.  I'll
try to work up some wine patches to work around the pthread issue.

Hopefully someone can build off this so we can get something in after the
freeze.

- - --
Anish Mistry
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- -- 
Jonathan Fosburgh
Storage Engineer
UT MD Anderson Cancer Center
Houston, TX 
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--- vm_mmap.c.orig	Tue Jul  2 16:06:19 2002
+++ vm_mmap.c	Wed Aug 18 16:49:12 2004
@@ -194,6 +194,8 @@
 	vm_offset_t addr;
 	vm_size_t size, pageoff;
 	vm_prot_t prot, maxprot;
+	vm_map_t map;
+
 	void *handle;
 	int flags, error;
 	int disablexworkaround;
@@ -264,8 +266,25 @@
 	 */
 	else if (addr == 0 ||
 	    (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
-	     addr < round_page((vm_offset_t)vms->vm_daddr + maxdsiz)))
-		addr = round_page((vm_offset_t)vms->vm_daddr + maxdsiz);
+	     addr < round_page((vm_offset_t)vms->vm_daddr + maxdsiz))) {
+			/*
+			 * XXX So much dirtyness someone who knows what they are doing
+			 * will want to fix this monstrosity.
+			 */
+			map = &vms->vm_map;
+			vm_map_lock(map);
+			addr = round_page((vm_offset_t)vms->vm_daddr + maxdsiz);
+			if(vm_map_findspace(map, addr, size, &addr) != 0) {
+			/*
+			 * since we can't grab the upper process address space bruteforce it.
+			 */
+				for(addr = 0;addr <= round_page((vm_offset_t)vms->vm_taddr) &&
+					vm_map_findspace(map, addr, size, &addr) != 0
+					;addr += PAGE_SIZE,addr = round_page(addr));
+			}
+			vm_map_unlock(map);	
+	
+	}
 
 	if (flags & MAP_ANON) {
 		/*
--- vm_mmap.c.orig	Thu Aug  5 03:04:33 2004
+++ vm_mmap.c	Wed Aug 18 21:31:13 2004
@@ -208,6 +208,8 @@
 	vm_offset_t addr;
 	vm_size_t size, pageoff;
 	vm_prot_t prot, maxprot;
+	vm_map_t map;
+
 	void *handle;
 	int flags, error;
 	off_t pos;
@@ -276,9 +278,26 @@
 		if (addr == 0 ||
 		    (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
 		    addr < round_page((vm_offset_t)vms->vm_daddr +
-		    lim_max(td->td_proc, RLIMIT_DATA))))
+		    lim_max(td->td_proc, RLIMIT_DATA)))) {
+			/*
+			 * XXX So much dirtyness someone who knows what they are doing
+			 * will want to fix this monstrosity.
+			 */
+			map = &td->td_proc->p_vmspace->vm_map;
+			vm_map_lock(map);
 			addr = round_page((vm_offset_t)vms->vm_daddr +
-			    lim_max(td->td_proc, RLIMIT_DATA));
+				lim_max(td->td_proc, RLIMIT_DATA));
+			if(vm_map_findspace(map, addr, size, &addr) != 0) {
+			/*
+			 * since we can't grab the upper process address space bruteforce it.
+			 */
+				for(addr = 0;addr <= round_page((vm_offset_t)vms->vm_taddr) &&
+					vm_map_findspace(map, addr, size, &addr) != 0
+					;addr += PAGE_SIZE,addr = round_page(addr));
+			}
+			vm_map_unlock(map);
+		}
+
 		PROC_UNLOCK(td->td_proc);
 	}
 	if (flags & MAP_ANON) {
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