[Bug gdb/14523] [MIPS] unexpected signal with gdb target

["maarten at treewalker dot org" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14523

Maarten ter Huurne <maarten at treewalker dot org> changed:

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--- Comment #3 from Maarten ter Huurne <maarten at treewalker dot org> 2012-08-29 20:58:18 UTC ---
The problem was introduced between 7.3 and 7.4, to be exact in commit 7ade46b0
in the official git mirror, a change set by Ulrich Weigand committed on Wed Apr
27 13:29:11 2011 +0000.

On some platforms, such as Linux MIPS, NSIG is 128 and SIGRTMAX is also 128.
However, there is no GDB_SIGNAL_REALTIME_128 constant, so target signal 128 is
considered a real-time signal but not mappable to a GDB signal, which triggers
the error condition in gdb_signal_from_host() in gdb/common/signals.c.

I worked around the problem by mapping signal 128 to GDB_SIGNAL_UNKNOWN. See
attached patch. I don't know if this can be considered a solution or whether
introducing GDB_SIGNAL_REALTIME_128 would be preferred instead.

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