Instruction Set
The Jazelle instruction set is well documented as Java bytecode. However, ARM have chosen to remain quiet on the exact execution environment details; the documentation provided with Sun's HotSpot Java Virtual Machine goes as far as to state: For the avoidance of doubt, distribution of products containing software code to exercise the BXJ instruction and enable the use of the ARM Jazelle architecture extension without agreement from ARM is expressly forbidden..
Employees of ARM have in the past published several white papers that do give some good pointers about the processor extension. Versions of the ARM Architecture Reference Manual available from 2008 have included pseudocode for the 'BXJ' (Branch and eXchange to Java) instruction, but with the finer details being shown as "SUB-ARCHITECTURE DEFINED" and documented elsewhere.
Read more about this topic: Jazelle
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