This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
dev:crosscompiler:backend_arm:code_generator [2019/11/17 19:53] – [Exception Stackframe] ursgraf | dev:crosscompiler:backend_arm:code_generator [2022/12/20 11:34] (current) – [Accessing the Hardware] ursgraf | ||
---|---|---|---|
Line 16: | Line 16: | ||
\\ | \\ | ||
===== Exception Stackframe ===== | ===== Exception Stackframe ===== | ||
- | In case of an exception all volatile GPRs together with LR must be saved. | + | In case of an exception all volatile GPRs together with LR must be saved. |
- | EXTR's need no saving, as they are not allowed to be used in exceptions. If an exception method calls a method where EXTR are used (e.g. in an interrupt handler or in a decrementer | + | EXTR's need no saving, as they are not allowed to be used in exceptions. If an exception method calls a method where EXTR are used (e.g. in an interrupt handler or in a timer subclass) you have to use '' |
[{{ : | [{{ : | ||
- | For efficiency, the exception stack frame does not contain space for locals. Hence, you are not allowed to use so many locals that this becomes necessary. This will be checked for when compiling exception methods. | + | For efficiency, the exception stack frame does not contain space for locals. Hence, you are not allowed to use so many locals that this becomes necessary. This will be checked for when compiling exception methods. |
+ | |||
Optimization: | Optimization: | ||
Line 40: | Line 42: | ||
===== Accessing the Hardware ===== | ===== Accessing the Hardware ===== | ||
- | Java does not allow direct access and manipulation of absolute memory locations. Nevertheless this is essential for embedded programming. We therefore include this possibility by using a special class //ch.ntb.inf.deep.unsafe.arm.US.java// | + | Java does not allow direct access and manipulation of absolute memory locations. Nevertheless this is essential for embedded programming. We therefore include this possibility by using a special class //org.deepjava.unsafe.arm.US.java// |
===== Low Level Classes ===== | ===== Low Level Classes ===== |