Use of register g4 in kernel code

Hi,
My kernel is solaris 8, 64 bit and applications run as 32 bit. I was faciing a strange kernel panic (occured only once till now) where register $g4 contained a value which was not consistant with the contents in memory which it referenced to.
ppd_wput+0x78: call +0x5ec <ppd_pcproto>
mov %l1, %o1
ldx [%l1 + 0x18], %g4
ld [%g4], %g4 #exception occured here
panic message: BAD TRAP: type=34 rp=2a100c3ca30 addr=30001ced3ed mmu_fsr=0
3000007fc40: alignment error:
30001c60a40: addr=0x30001ced3ed
30001ccbee0: pid=1243, pc=0x10304d8c, sp=0x2a100c3c2d1, tstate=0x4400001606,
context=0x1a03
3000007f820: g1-g7: 3000d123e30, 100, 3000d10e060, 30001ced3ed, 20000000000,
0, 3000d10e060
g4 is 30001ced3ed, which caused the alignment exception.
l1 is 0x000003000d337600.
But when I looked at contents of l1 + 0x18, what I find does not match what %g4 has. It is 30001ced3d8
0x3000d337600: next prev cont
300019b0880 0 3000d335a40
0x3000d337618: rptr wptr datap
30001ced3d8 30001ced3f0 30001ced360
0x3000d337630: band flag queue
0 0 3000d3375f8
So I could not explain why I saw the panic. I read in one of the solaris ABI manual, that with V8, g4 is to be
used by only applications, but with V9 it can be used more freely by both application and system.
The compilation flags used to compile my driver are :
cc -D_KERNEL -xarch=v9 -xregs=no%appl -D_SYSCALL32 -D_SYSCALL32_IMPL -D_ELF64 -D__sparcv9cpu -DSYSACCT -DC2_AUDIT
By specifying -xcode=abs32 the compiler uses %l0 instead of %g4.
In this case where applications are still 32 bit and kernel is 64 bits, is it okay for kernel to use g4 ?
Thanks in advance.
-madhusudan

On the face of it, Session is ideal for this, however this is SharePoint and the obvious isn't always the best.
You'd need to do the calculation about memory usage and number of concurrent users to ensure it really is a viable option in Production.
If it isn't viable, or wouldn't scale to possible future usage what would you do? Then you need to ask if it's really necessary to move between pages? If the user needs to move through a dialog for example, that could be hosted on a single page which might
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Always remember, SharePoint might be hosted on ASP.NET but the design considerations are significantly different than if this were a pure ASP.NET application.
w: http://www.the-north.com/sharepoint | t: @JMcAllisterCH | YouTube: http://www.youtube.com/user/JamieMcAllisterMVP

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