Subject:
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Re: H8/300 Assembler/C interface
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Wed, 18 Apr 2001 23:15:51 GMT
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Viewed:
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1354 times
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Ralph Hempel <rhempel@bmts.com> wrote:
> If any of these are incorrect, please let me know. I'm not at
> my regular computer right now, or I'd look there...
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 to right
- additional parameters are pushed onto the stack before call
- rightmost parameters are pushed first
- registers may be joined to pass 32-bit parameters (i.e. r0r1 or r1r2)
- 32-bit parameters never split between r2 and stack
- return value in r0 (or r0r1 if 32-bits)
-Kekoa
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Message has 2 Replies:
 | | 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 (24 years ago, 18-Apr-01, to lugnet.robotics.rcx)
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Message is in Reply To:
| | H8/300 Assembler/C interface
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| Does anyone know offhand what the calling convention between C/C++ and H8/300 assembler is using the GNU tools? The assumptions I'm making are as follows: R7 is the stack pointer R6 is the first (leftmost) parameter passed and the result R0-5 are (...) (24 years ago, 18-Apr-01, to lugnet.robotics.rcx)
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