Module Name: src Committed By: snj Date: Thu May 20 05:51:59 UTC 2010
Modified Files: src/sys/arch/i386/i386 [netbsd-5]: trap.c vector.S Log Message: Pull up following revision(s) (requested by riz in ticket #1401): sys/arch/i386/i386/trap.c: revisions 1.251-1.253 via patch sys/arch/i386/i386/vector.S: revisions 1.50-1.51 via patch If we fault on the 'iret' during return to userpace (eg if %eip is outside the bounds of %cs) then hack the stack to contain a normal fault frame for the signal setup code (etc). Previously the code assumed that the original user trap frame was still present - at it is for faults when loading the segment registers. -- If we fault on the iret during return to userspace, see if we need to do a lazy update of %cs to make the stack executable. If a change is made, just retry the failing sequence. Signal handlers as gcc nested local functions now work! -- Fix 'fault on load of %gs during retirn to userspace' to look for the correct instruction bytes. Take the 'fault on load segment register' through the same path as 'fault on iret' so we don't have to fixup the broken stackframe that contains a mix of user and kernel registers, Update comments about how the faults during return to userspace are processed. Setting an invalid %gs in the saved context of a signal handler causes a SIGSEGV handler to be entered with what look like valid registers. To generate a diff of this commit: cvs rdiff -u -r1.241.4.1 -r1.241.4.2 src/sys/arch/i386/i386/trap.c cvs rdiff -u -r1.42.6.2 -r1.42.6.3 src/sys/arch/i386/i386/vector.S Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.