Serial device problems (68k assembler)

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elfpipe

Posted on: 2011/11/28 17:18 #1

Just can't stay away

I'm trying to open the serial device from the Napalm net driver. Sometimes it works, but some other times it hangs the entire machine right at the call to OpenDevice(). I'm wondering why this is. Here is my garbled code:


MOVEA.L    ABSEXECBASE.W,A6    ;080: 2c780004

    LEA    dos_name+1,A1        ;084: 43f90000033f

    MOVEQ    #0,D0            ;08a: 7000

    JSR    _LVOOpenLibrary(A6)        ;08c: 4eaefe68

    MOVE.L    D0,dos_base        ;090: 23c000000318

    BEQ fail1



    JSR debug_puts1



    MOVEA.L ABSEXECBASE.W,A6

    JSR _LVOCreateMsgPort(A6)

    MOVE.L    D0,msg_port

    BEQ    fail2



    JSR debug_puts2



    MOVEA.L    D0,A0

    MOVE.L #IOEXTSER_SIZE,D0

    JSR _LVOCreateIORequest(A6)

    MOVE.L    D0,io_request

    BEQ fail3



    JSR debug_puts3

    

    LEA    serial_name,A0

    MOVEQ    #0,D0

    MOVEA.L    io_request,A1

    MOVEQ    #0,D1

    JSR _LVOOpenDevice(A6)

    TST    D0

    BNE    fail4



    JSR debug_puts4

rwo

Re: Serial device problems (68k assembler)

Posted on: 2011/11/28 18:52 #2

Not too shy to talk

I can not see any errors, other than the posibility that your debug functions trashes the D0 Register.

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

elfpipe

Re: Serial device problems (68k assembler)

Posted on: 2011/11/28 21:06 #3

Just can't stay away

I have tried to remove all debug output, so that is not the problem.

And even if I try copying the code to a separate small project that just opens and closes the serial device, then there is no problem. The problem arises only when this very same code is run as part of the network driver in Napalm... Annoying!!

Who's the expert on serial device issues??

elfpipe

Re: Serial device problems (68k assembler)

Posted on: 2011/11/30 18:12 #4

Just can't stay away

Arrrgh!!!...

nbache

Re: Serial device problems (68k assembler)

Posted on: 2011/11/30 20:41 #5

Just can't stay away

Quote:

alfkil wrote:
Arrrgh!!!...

Maybe you should try the Hyperion forum, developer section?

Best regards,

Niels

elfpipe

Re: Serial device problems (68k assembler)

Posted on: 2011/12/1 8:51 #6

Just can't stay away

@niels

Thanks Niels, I will do that

rwo

Re: Serial device problems (68k assembler)

Posted on: 2011/12/2 1:32 #7

Not too shy to talk

Checking out you source again I found this...

acording to my old Autodoc it do not mention that the CreateMsgPort() returns the result in D0. Small chance this is wrong.

and you OpenDevice() ends with a TST D0, here you do not set the size it uses... if I remember correct ASM-Pro uses .w as default, this is wrong as the result is only a Byte size.. but that depends on the assembler you uses.

René

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

salass00

Re: Serial device problems (68k assembler)

Posted on: 2011/12/2 6:21 #8

Just can't stay away

@rwo

Quote:

acording to my old Autodoc it do not mention that the CreateMsgPort() returns the result in D0. Small chance this is wrong.

Result should always be in D0 if function has one, except for a few functions in utility.library that return a 64-bit result in which case it's in D0/D1.

elfpipe

Re: Serial device problems (68k assembler)

Posted on: 2011/12/2 14:00 #9

Just can't stay away

@rwo

I am using phxass.

It seems, that if I put crimsoncrisis on the Petunia blacklist (SYS:Prefs/Compatibility), then the problem does not arise. How could this be??

rwo

Re: Serial device problems (68k assembler)

Posted on: 2011/12/2 15:55 #10

Not too shy to talk

@alfkil

OpenDevice() puts the result in D0 but only as a byte (move.b d0)..

So you should really change your 'TST D0' to 'TST.B D0'.. for I expect phxass converts your 'TST D0' into 'TST.W D0' so it check to many bits..

As the 24 upper bits in D0 is trash from anywhere, and blacklisting it will only result it being run from a diffrent place and will ofcoase result in diffrent upper 24bits.

But if this change do not work I must say I don't have an idea whats is wrong.

Btw: what serial device do you open?

EDIT: Windows locked up, so I had to make a temp save

Edited by rwo on 2011/12/2 16:13:48

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

elfpipe

Re: Serial device problems (68k assembler)

Posted on: 2011/12/3 21:45 #11

Just can't stay away

@rwo

I have tried to change TST to TST.B, and so far it has not hung up on me! Thanks for noticing this (if this is really the solution)!

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