Planned deprecation of SYSTEM.LNK, SP and PC variables
Posted: Mon Dec 18, 2023 3:40 am
We have discovered some reliability issues while running regression tests on v9.0.4 Astrobe for Cortex-M3, M4 and M7. These are related to the SYSTEM.LNK problem. A number of the instructions generated e.g. TEQ, TST, CMP etc. are documented as, for example:
Consequently we are planning to deprecate the SYSTEM.LNK, SYSTEM.SP and SYSTEM.PC variables in the next feature release of Astrobe for Cortex-M in 2024. If you are using these variables you should replace them with the inline functions SYSTEM.REG and SYSTEM.LDREG as soon as is convenient. For example:
could be rewritten as:
Let us know if you have any examples of real-world code that you do not know how to transform.
where 15 is PC and 13 is SP. The behaviour is intermittent. For example one test worked OK on M3 and M4 but produced a usage fault on M7.if n == 15 || m IN {13,15} then UNPREDICTABLE;
Consequently we are planning to deprecate the SYSTEM.LNK, SYSTEM.SP and SYSTEM.PC variables in the next feature release of Astrobe for Cortex-M in 2024. If you are using these variables you should replace them with the inline functions SYSTEM.REG and SYSTEM.LDREG as soon as is convenient. For example:
Code: Select all
SYSTEM.SP := stackStart;
savedSP := SYSTEM.SP + 8;Code: Select all
CONST SP = 13;
...
SYSTEM.LDREG(SP, stackStart);
savedSP := SYSTEM.REG(SP) + 8;