Datasheet

Semihosting

If you are calling SWIs from assembly language code it is best to use the operation

names that are defined in

semihost.h

. You can define the operation names with an

EQU

directive. For example:

SYS_OPEN EQU 0x01

SYS_CLOSE EQU 0x02

Changing the semihosting SWI numbers

It is strongly recommended that you do not change the semihosting SWI numbers

0x123456

(ARM) or

0xAB

(Thumb). If you do so you must:

• change all the code in your system, including library code, to use the new SWI

number

• reconfigure your debugger to use the new SWI number.