Changes

|}

|}

== Syscalls (via ARM syscall instruction) ==

== Syscalls (via syscall instruction) ==

These types of syscalls are created with the ARM syscall instruction. The exception handler is empty and just do nothing and returns. These syscalls are [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/Bgbjhiea.html RealView semihosting operations] that allow communication with a debugger.<br>

These types of syscalls are created with the thumb syscall instruction. When the u16 from retaddr-0x2 matches 0xdfab(intended as thumb "svc 0xab" but ARM "svc 0xdfab" would pass too), it will just return from the exception-handler, otherwise it will do the same thing described [[IOSU|here]] for exceptions. These syscalls are [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/Bgbjhiea.html RealView semihosting operations] that allow communication with a debugger.<br>

Currently only syscall 0x04 is still used in production versions of IOSU.

Currently only syscall 0x04 is still used in production versions of IOSU.