https://bugs.winehq.org/show_bug.cgi?id=55710
--- Comment #25 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Paul Gofman from comment #22)
I guess one quick way to approach what is at the address is to hack-insert infinite sleep into sigsys_handler with, e. g., Eax == 0 (letting test 0xffff syscall still to be processed), and then watch /proc/<pid>/maps.
/proc/<pid>/maps essentially matches what pmap lists.