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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Ridley @ a safe distance‏ @11rcombs 25 Mar 2020
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      Replying to @whitequark

      what does "turning on/off reentrancy" actually do in this context?

      1 reply 0 retweets 1 like
    2. whitequark‏ @whitequark 25 Mar 2020
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      Replying to @11rcombs

      by default sdcc behaves as if all locals (parameters, too) are `static`. in fact it will overlap the storage of parameters of all leaf functions. you can turn that off and it uses stack as you'd expect

      2 replies 0 retweets 12 likes
    3. Hector Martin‏ @marcan42 25 Mar 2020
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      Replying to @whitequark @11rcombs

      Or you can use a PIC where there is no data stack at all and then if you still need reentrancy haha good luck you need to emulate the stack using a pointer somewhere and indirect accesses. But reentrancy would overflow the 8-level callstack anyway. 2-level on some PICs.

      2 replies 0 retweets 7 likes
    4. R. Ou‏ @rqou_ 25 Mar 2020
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      Replying to @marcan42 @whitequark @11rcombs

      or possibly relooper the code?

      1 reply 0 retweets 0 likes
    5. whitequark‏ @whitequark 25 Mar 2020
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      Replying to @rqou_ @marcan42 @11rcombs

      at this point you could implement a VM for something sane in PIC assembly and just switch to programming that

      2 replies 0 retweets 11 likes
    6. Hector Martin‏ @marcan42 25 Mar 2020
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      Replying to @whitequark @rqou_ @11rcombs

      Like Brainfuck.

      1 reply 1 retweet 6 likes
    7. R. Ou‏ @rqou_ 25 Mar 2020
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      Replying to @marcan42 @whitequark @11rcombs

      avr emulator on pic? :trollface:

      2 replies 0 retweets 4 likes
    8. Hector Martin‏ @marcan42 25 Mar 2020
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      Replying to @rqou_ @whitequark @11rcombs

      Cursed PIC stories: the callstack is circular *and* there is no reset instruction (on PIC12), so I once implemented "panic and restart" from an IRQ handler by just jumping to the reset vector.

      1 reply 0 retweets 9 likes
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    10. R. Ou‏ @rqou_ 25 Mar 2020
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      Replying to @bofh453 @marcan42 and

      you mean code that's 90% MOVFW/MOVWF opcodes by volume might not be the best architecture design?? (/s)

      1 reply 0 retweets 4 likes
      Hector Martin‏ @marcan42 25 Mar 2020
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      Replying to @rqou_ @bofh453 and

      You mean MOVF f,W and MOVWF f. Because then there's the amazing MOVF f,F form. Which actually is just "set flags and trigger unwanted RMW side-effects on f".

      11:26 PM - 25 Mar 2020
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      • Thaddeus whitequark
      1 reply 0 retweets 2 likes
        1. R. Ou‏ @rqou_ 25 Mar 2020
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          Replying to @marcan42 @bofh453 and

          ah, apparently MOVFW is an mpasm alias (and might be the form that ida pro outputs?)

          0 replies 0 retweets 1 like
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