.Level_0%
STMFD     R13!, {registers, R14}
          \
BL        Level_1%
          \
LDMFD     R13!, {registers, R15}
::
.Level_1%
STMFD     R13!, {registers, R14}
          \
BL        Level_2%
          \
LDMFD     R13!, {registers, R15}
::
.Level_2%
STMFD     R13!, {registers, R14}
          \
LDMFD     R13!, {registers, R15}