[Bug server/14922] New: gdbserver: single-stepping out of signaltrampolines on Linux/i386

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14922

             Bug #: 14922
           Summary: gdbserver: single-stepping out of signal trampolines
                    on Linux/i386
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
        AssignedTo: unassigned@sourceware.org
        ReportedBy: palves@redhat.com
    Classification: Unclassified
              Host: i686-pc-linux-gnu
            Target: i686-pc-linux-gnu


i386-linux-nat.c:i386_linux_resume has special handling for stepping out of a
signal handler, introduced by

  http://sourceware.org/ml/gdb-patches/2000-04/msg00582.html.

That code is used when native debugging.

However, GDBserver doesn't have this handling, but, stepping out of the signal
trampoline seems to work correctly anyway.

For testing, I made sure I got to the signal handler with a normal continue, so
that the restored context would possibly not have the trace flag set.  I
confirmed the i386-linux-nat.c code is still reachable (Fedora 17, x86_64
-m32).

Perhaps the kernel is already taking care of leaving the trace flag set
nowadays, if it sees it set on a sigreturn/rt_sigreturn entry.

This is relevant for the local/remote feature parity project.

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