 | | RE: H8/300 Assembler/C interface
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(...) I've just done some more browsing and found this tidbit: (URL) It seems to indicate that tghe registers are always filled and that a long may be split across r2 and the stack. Comments? Cheers, Ralph (25 years ago, 20-Apr-01, to lugnet.robotics.rcx)
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| | Ross
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Thanks Ross, I apreciate and value your advice in my persuit of enlightment:-) (25 years ago, 20-Apr-01, to lugnet.robotics.rcx)
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| | RE: H8/300 Assembler/C interface
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(...) Ahhh, that makes it awkward with the RCX ROM calls, but I'm pretty sure I can make my assembler source compatible with this. I'm just getting ready to release an assembler RCX serial library that is either polled or interrupt driven. Any (...) (25 years ago, 19-Apr-01, to lugnet.robotics.rcx)
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| | Re: H8/300 Assembler/C interface
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(...) By the caller? No. They are callee-save. -Kekoa (25 years ago, 19-Apr-01, to lugnet.robotics.rcx)
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| | RE: H8/300 Assembler/C interface
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(...) Thanks Kekoa. One more question, are the other registers r3,r4,r5,r6 considered volatile across a function call in GCC? Cheers, Ralph (25 years ago, 19-Apr-01, to lugnet.robotics.rcx)
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| | Re: H8/300 Assembler/C interface
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(...) Yeah, you are right. My bad. -Kekoa (25 years ago, 19-Apr-01, to lugnet.robotics.rcx)
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| | RE: H8/300 Assembler/C interface
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(...) Not necessarily, that's why I'm asking. If the caller cleans up the stack, then the function just does an RTS and the caller adjusts the stack because it knows how much stuff was pushed on. For programs with lots of calls, this generates extra (...) (25 years ago, 19-Apr-01, to lugnet.robotics.rcx)
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| | Re: H8/300 Assembler/C interface
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(...) Also: - caller cleans up parameters on stack - stack pointer is r7 The caller must clean up stack parameters b/c the return address is pushed after parameters are. -Kekoa (25 years ago, 18-Apr-01, to lugnet.robotics.rcx)
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| | Re: H8/300 Assembler/C interface
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(...) Somebody correct me if I'm wrong. I just compiled some programs to check this. I believe that maybe the *ROM* calling convection is as Ralph described, but almost definitely the GCC calling convention is: - r0, r1, r2 hold parameters from left (...) (25 years ago, 18-Apr-01, to lugnet.robotics.rcx)
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| | RE: RCX+PC=Rubik's Cube Solver
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(...) DUDE! These are unbelievable......I would never even consider doing something like this due to other time constraints like partners and kids. These are amazing - a must see and candidate for Site of the Week, no? Cheers, Ralph Hempel (25 years ago, 18-Apr-01, to lugnet.robotics, lugnet.robotics.rcx)
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