John Baldwin wrote:
On Thursday, September 02, 2010 7:36:08 am David Xu wrote:
John Baldwin wrote:
On Thursday, September 02, 2010 6:22:18 am Kostik Belousov wrote:
On Thu, Sep 02, 2010 at 05:35:39PM +0000, David Xu wrote:
Kostik Belousov wrote:
the tf_err may not be equal to ksi_addr! This may need to be fixed.
The change was introduced by
r151316 | davidxu | 2005-10-14
/* Old FreeBSD-style arguments. */
- sf.sf_siginfo = code;
- sf.sf_addr = regs->tf_err;
+ sf.sf_siginfo = ksi->ksi_code;
+ sf.sf_addr = (register_t)ksi->ksi_addr;
sf.sf_ahu.sf_handler = catcher;
:(
The rollback looks straightforward. I explicitely decided to not change
any architecture that is not i386.
It may not be this simple. At one point we had a "feature" where we
trashed
tf_err in the trapframe to store the address so it could be passed to
sendsig
for this purpose. I think once we started using ksi_addr here we removed
the
trashing of tf_err as it was no longer necessary.
I saw RELENG_5 saved it at td_md.md_fault_address, but I really can not
remember
which version has such "feature". ;-)
By the way, I still can not find a modern program uses this old style
and wants to
know the exact fault address.
Kostik Belousov fixed the error I had made when I was implementing
signal queue.
See revision 170688 for example:
r170688 | jhb | 2007-06-13 18:37:48 -0400 (Wed, 13 Jun 2007) | 6 lines
Don't clobber tf_err with the eva from a page fault as the page fault
address is saved in ksi_addr already.
PR: i386/101379
Submitted by: Tijl Coosemans : tijl ulyssis org
Index: trap.c
===================================================================
--- trap.c (revision 170687)
+++ trap.c (revision 170688)
@@ -785,9 +785,6 @@
return (-1);
}
- /* kludge to pass faulting virtual address to sendsig */
- frame->tf_err = eva;
-
return((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV);
}
Given that, I think the existing code is correct and that there is no bug to
be fixed.
Thanks for clarifying, I am really confused when Kostik Belousov mailed me,
I wish I had not made the mistake, after all it was 4 years 10 months
ago, so I
can not remember exactly what had happened at that time.
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