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purpose of RSDIS in ACTLR ?

Sylvain

Hello,

What is the purpose of the RSDIS (Return Stack DISable) bit in ACTLR ?

What would be the consequence on code execution if set DISable ?

Is the software able to write this bit ?

Thanks for help

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  • 0 in reply to Sylvain

    There are discrepancies between the two documents but in this case it is not an error. When RSDIS is set, the return address stack pointer behaves differently in Cortex-R4 and Cortex-R5. If you will notice, when the prediction is forced to a fixed direction (through the BP field in the ACTLR),  the global history table also behaves differently.

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  • 0 in reply to Sylvain

    There are discrepancies between the two documents but in this case it is not an error. When RSDIS is set, the return address stack pointer behaves differently in Cortex-R4 and Cortex-R5. If you will notice, when the prediction is forced to a fixed direction (through the BP field in the ACTLR),  the global history table also behaves differently.

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