Default behavior in MIPS is to silently fix up and
emulate. A MIPS-specific
system call (sys_sysmips with the command argument
and a parameter agument of zero) allows for this to be overridden, so that
such accesses will be fatal. It looks as
if there was once support to log the events
to syslog, independently of whether or not they were fixed up, but it doesn't look to me
as if that still works in 2.6.x kernels.
----- Original Message -----
Sent: Thursday, February 22, 2007 10:18
Subject: Re: unaligned access
In case of arm processor, the alignment trap behavior can be changed by
simply echo a number into /proc/sys/debug/alignment
A user process performing an unaligned memory
will cause the kernel to print a message
process name, pid, pc, instruction, address, and
The kernel will attempt to fix up the user
performing the unaligned access. This is of
slow (think about the floating point emulator)
not recommended for production use.
The kernel will send a SIGBUS signal to the user
performing the unaligned access.
I would like to know Is there
similar type of implimentation avalilable for MIPS processor in linux-2.6.12
kernel to view or log the unaligned access addresses and corresponding
Rajat Jain <email@example.com>
2/22/07, sathesh babu wrote:
> I have ported linux-2.6.12 kernel on MIPS processor.I would like
> print the warning messges whenenver kernel or user code try to
> unaligned address ( including proceor ID ).
> Is there
any configuration option avaliable in the kernel to view
Ummm ... not sure about MIPS, but in i386,
exception 17 is raised for
every unaligned access. alignment_check() is
invoked for every
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