sme: Fixup sigframe gdbarch when vg/svg changes

With SME, where you have two different vector lengths (vl and svl), it may be
the case that the current frame has a set of vector lengths (A) but the signal
context has a distinct set of vector lengths (B).

In this case, we may run into a situation where GDB attempts to use a gdbarch
created for set A, but it is really dealing with a frame that was using set
B.

This is problematic, specially with SME, because now we have a different
number of pseudo-registers and types that gets cached on creation of each
gdbarch variation.

For AArch64 we really need to be able to use the correct gdbarch for each
frame, and I noticed the signal frame (tramp-frame) doesn't have a settable
prev_arch field.  So it ends up using the default frame_unwind_arch function
and eventually calling get_frame_arch (next_frame).  That means the previous
frame will always have the same gdbarch as the current frame.

This patch first refactors the AArch64/Linux signal context code, simplifying
it and making it reusable for our purposes of calculating the previous frame's
gdbarch.

I introduced a struct that holds information that we have found in the signal
context, and with which we can make various decisions.

Finally, a small change to tramp-frame.c and tramp-frame.h to expose a
prev_arch hook that the architecture can set.

With this new field, AArch64/Linux can implement a hook that looks at the
signal context and infers the gdbarch for the previous frame.

Regression-tested on aarch64-linux Ubuntu 22.04/20.04.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/gdb/tramp-frame.c b/gdb/tramp-frame.c
index c69ee6e..94e42e9 100644
--- a/gdb/tramp-frame.c
+++ b/gdb/tramp-frame.c
@@ -170,5 +170,6 @@ tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
   unwinder->stop_reason = default_frame_unwind_stop_reason;
   unwinder->this_id = tramp_frame_this_id;
   unwinder->prev_register = tramp_frame_prev_register;
+  unwinder->prev_arch = tramp_frame->prev_arch;
   frame_unwind_prepend_unwinder (gdbarch, unwinder);
 }