Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to process 190 thread 0x6fa7]
0x000ae150 in dyld_stub_pthread_key_create ()

0x000C: BLX   R3
0x000E: LDR   R0, [R6]

set arm fallback-mode (arm|thumb|auto)
GDB uses the symbol table, when available, to determine whether instructions are ARM or Thumb. This command controls GDB’s default behavior when the symbol table is not available. The default is ‘auto’, which causes GDB to use the current execution mode (from the T bit in the CPSR register).