Andrew Cagney <ac131313@redhat.com> writes:
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Hello,
This patch removes the need for setting the save_dummy_frame_tos method
(d10v and i386). Instead the frame ID stack addr returned by
push_dummy_call is saved (by generic_save_dummy_frame_tos) and used as
the dummy breakpoint ID.
The i386 and d10v don't show any regressions.
Mark, look right?
Looks good to me. We can make similar changes to amd64, but if you
don't want to make those, I'll do a followup patch to yours.
I'd like to add a comment to the ``return sp + 8'' only I'm not actually
sure what's going on here :-/
It certainly deserves a comment. I'm just not sure. This "+ 8" is
all over the place (i386_frame_this_id, i386_sigtramp_frame_this_id,
i386_unwind_dummy_id). It's there, since all frame unwinders for a
given target have to agree (within a certain margin) on the defenition
of the stack address of a frame. Otherwise frame_id_inner() won't
work correctly. Since DWARF2/GCC uses the stack address *before* the
function call as a frame's CFA. On the i386, when %ebp is used as a
frame pointer, the offset between the contents %ebp and the CFA as
defined by GCC.