patchSimulavr: an AVR simulator - Patches: patch #10479, Bug #66044: Apply address mask in...

 
 

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patch #10479: Bug #66044: Apply address mask in instruction decoder for LD/ST

Submitter:  Igor Proskurin <sciprosk>
Submitted:  Mon 30 Sep 2024 06:08:46 PM UTC
   
 
Category:  bug fix Priority:  5 - Normal
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open
Component Version:  simulavr

Mon 30 Sep 2024 06:08:46 PM UTC, original submission:  

Applies `core->dataAddressMask` in LD/ST instructions before writing to memory. Also, skips updating XH, YH, ZH if `core->dataAddressMask` is less or equal to 0xFF.

To comply with the clause from the "AVR Instruction Set Manual":

> only the low byte of the X-pointer is updated in devices with no more than 256 bytes of data space. For such devices, the high byte of the pointer is not used by this instruction and can be used for other purposes.


See also an issue in AVR-LibC: https://github.com/avrdudes/avr-libc/issues/954

 Igor Proskurin <sciprosk>

 

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Attached Files
file #56467:  apply_address_mask.patch added by sciprosk (7KiB - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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  • -email is unavailable- added by sciprosk (Submitted the item)

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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2024-09-30 sciprosk Attached File- Added apply_address_mask.patch, #56467

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