* R0 ! Thread name, (NUL-term)
R1 = Execution priority of new thread
R2 = Argument for thread
R3 ! Address of code for thread
R4 ! Current APCS stack chunk (or NUL for none)
* R0 = Handle of newly created thread
Notes: This SWI starts a new thread of execution. The execution priority is in the range -20 to 20, the lower value being of the highest priority. The thread is entered as follows:
* R0 = My thread handle
R1 = Parent's thread handle
R2 = Argument passed by parent
R10 ! Stack limit
R11 ! Frame pointer (NUL)
R14 = Link value
R15 = User mode with interrupts enabled
The values of all other registers, including the floating point ones, are undefined. The link value in fact holds the address of a function that calls SWI Thread_Zap, so the thread can terminate by issuing the normal MOVS pc, lr instruction.
If a pointer to the current APCS stack chunk is supplied, as is the case wih the ThreadLib C library, then Thread will copy over the SharedCLibrary's relocation reserved words in order to enable the SharedCLibrary to continue to function properly. See the note on using the SharedCLibrary later on.
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