In gcc/config/avr/libgcc.S, revision 143306, a change to __do_global_ctors &
__do_global_dtors was made which makes use of register r20.
This register can be used to pass parameters to the constructors, but it is not
pushed/popped from the stack, so it will get clobbered if a constructor uses
that register.
I have currently worked around it by pushing/popping r20 around the call to
__tablejump__, but I am not convinced that this is the correct fix (the
constructors should probably push & pop r20 themselves).
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Summary: registers used in __do_global_ctors can get clobbered
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: blocker
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: gcc at d-silva dot org
GCC host triplet: i686-pc-mingw32
GCC target triplet: avr
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45263
