CVS commit: src/sys/arch/amd64/amd64

["David Laight" <dsl%netbsd.org@localhost>]

Module Name:    src
Committed By:   dsl
Date:           Tue May 22 21:14:37 UTC 2012

Modified Files:
        src/sys/arch/amd64/amd64: trap.c

Log Message:
Treat traps in kernel mode during the 'return to user' iret sequence
as user faults.
Based heavily in the i386 code with the correct opcode bytes inserted.
iret path tested, arranging for segment register errors is harder.
User %fs and %gs (32bit apps) are loaded much earlier and any errors
will generate kernel panics - there is probably code to try to stop
the invalid values being set.


To generate a diff of this commit:
cvs rdiff -u -r1.70 -r1.71 src/sys/arch/amd64/amd64/trap.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.