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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/04/22 11:45:12 UTC

[GitHub] [incubator-nuttx] Ouss4 commented on pull request #6129: tools:minidumpserver.py support xtensa

Ouss4 commented on PR #6129:
URL: https://github.com/apache/incubator-nuttx/pull/6129#issuecomment-1106433773

   > @Ouss4 Hi ,I encountered a problem. In the architecture of xtensa, the highest bit of the A0 register is always set to 1. During debugging with gdb, the address accessed is` 0x800XXXXX`, but the actual address is` 0x400XXXXX`. I see that you are in openocd After doing related work, will openocd `BIT AND` the highest bit of the A0 register? Looking forward to your reply.
   
   Hi,
   That's normal behavior.  A0 (the return address) also encodes the call increment in its most significant two bits (31 and 30), the address is the rest of the bits.  The call increment is used by the `ret` instruction to determine the value to rotate the window with.


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