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[PATCH, doc]: update exception handling docs


OK for mainline?  I will fill this paragraph in emacs before committing
it, but decided against it when preparing this message to make the diff
easier to read.

Thanks,
Ben

2007-11-28  Ben Elliston  <bje@au.ibm.com>

        * doc/tm.texi (Exception Handling): Mention unwind-dw2-xtensa.c.

Index: doc/tm.texi
===================================================================
--- doc/tm.texi (revision 130489)
+++ doc/tm.texi (working copy)
@@ -3371,8 +3371,8 @@ code to the call-frame unwinder for use 
 available.  The most common reason to implement this macro is to unwind
 through signal frames.
 
-This macro is called from @code{uw_frame_state_for} in @file{unwind-dw2.c}
-and @file{unwind-ia64.c}.  @var{context} is an @code{_Unwind_Context};
+This macro is called from @code{uw_frame_state_for} in @file{unwind-dw2.c},
+@file{unwind-dw2-xtensa.c} and @file{unwind-ia64.c}.  @var{context} is an @code{_Unwind_Context};
 @var{fs} is an @code{_Unwind_FrameState}.  Examine @code{context->ra}
 for the address of the code being executed and @code{context->cfa} for
 the stack pointer value.  If the frame can be decoded, the register save



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