(gdb) bt
#0  0x0853eef3 in drc_execute (drc=0xcad3908) at src/x86drc.c:156
#1  0x08372b62 in ppcdrc603_execute (cycles=833333)
    at src/cpu/powerpc/ppcdrc.c:1155
#2  0x08085f24 in cpunum_execute (cpunum=0, cycles=833333)
    at src/cpuintrf.c:1444
#3  0x08080fb6 in cpu_timeslice () at src/cpuexec.c:1042
#4  0x080803ca in cpu_run () at src/cpuexec.c:477
#5  0x080d3b90 in run_machine_core () at src/mame.c:600
#6  0x080d3a31 in run_machine () at src/mame.c:531
#7  0x080d370d in run_game (game=2965) at src/mame.c:363
#8  0x09b99498 in main (argc=2, argv=0xbfcd73a4) at src/unix/main.c:104
(gdb)