root/core/entry.S

   1     .section .entry
   2 #ifndef THUMB_FW
   3     MOV     R0, #2
   4     TEQ     R0, #2
   5     LDR     SP, =MEMBASEADDR
   6     MOV     R11, #0
   7 #else
   8     .code 16
   9     .syntax unified
  10 #endif
  11     B       startup