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* config/ia64/unwind-ia64.c (struct _Unwind_Context): Add new field 'signal_pfs_loc'. (uw_frame_state_for): Remove duplicate code dealing with leaf procedures without unwind info. If in the frame after unwinding through a signal handler, restore the AR.PFS register instead of the CFM if AR.PFS has not been saved. * config/ia64/linux-unwind.h (ia64_fallback_frame_state): Do not set 'pfs_loc' to the AR.PFS location in the signal context; instead set 'signal_pfs_loc'. Manually generate the unwind info for the AR.PFS register. (ABI_MARKER_OLD_LINUX_SIGTRAMP, ABI_MARKER_OLD_LINUX_INTERRUPT, ABI_MARKER_LINUX_SIGTRAMP, ABI_MARKER_LINUX_INTERRUPT): Define. (ia64_handle_unwabi): Test 'fs->unwabi' against them. Do not set 'pfs_loc' to the AR.PFS location in the signal context; instead set 'signal_pfs_loc'. Remove code preventing the AR.PFS register from being restored from the signal context. From-SVN: r150777
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