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Coldfire V2 : parameter passing problem

Posted by pavel on July 6, 2012
Hello

I'm trying to get the FreeRTOS running on our custom board with MCF5232 using CodeWarrior 7.2. I came out from Demo project "ColdFire_MCF52221_CodeWarrior". After some debugging to find out why interrupts are not executed I run into function
ulPortSetIPL
in portasm.S which expects its argument on the stack but from the disasembly I could see that the paraemetr is passed in D0 register.


ulPortSetIPL:
_ulPortSetIPL:
link A6,#-8
movem.l D6-D7,(SP)

move.w SR,D7 /* current sr */

move.l D7,D0 /* prepare return value */
andi.l #0x0700,D0 /* mask out IPL */
lsr.l #8,D0 /* IPL */

move.l 8(A6),D6 /* get argument +++++++++++++++++++++++ expected value on stack */
andi.l #0x07,D6 /* least significant three bits */
lsl.l #8,D6 /* move over to make mask */

andi.l #0x0000F8FF,D7 /* zero out current IPL */
or.l D6,D7 /* place new IPL in sr */
move.w D7,SR

movem.l (SP),D6-D7
lea 8(SP),SP
unlk A6
rts


Code generated by compiler

moveq #4,d0 ; ulPortSetIPL( configMAX_SYSCALL_INTERRUPT_PRIORITY ) where argument is #4
jsr _@DummyFn1 ; I don't know why but ulPortSetIPL is also referenced as _@DummyFn1


Could anyone please help me how get over this problem and make the call properly? Maybe some settings in CodeWarrior are necessary but when I looked into the example project settings Code Generation -> Cold Fire Processor I could see that Parameter Passing is Register but the combobox is disabled. The same as in my project.

Thank you for any help

pavel

RE: Coldfire V2 : parameter passing problem

Posted by Erich Styger on July 6, 2012
Hello,
The ColdFire compiler has changed the register passing. CodeWarrior 7.2 is rather old and it looks you mix up the old compiler with a newer port. So you probably better move up to the actual 10.2 version of the tools, or you need to backport or use an older FreeRTOS port. I believe there is a __registerABI or similar pragma you could use as well.

Hope this helps,
Erich

RE: Coldfire V2 : parameter passing problem

Posted by Richard on July 7, 2012
See the firs item here for a fix:
http://www.freertos.org/a00104.html?1#knownissues

Regards.

RE: Coldfire V2 : parameter passing problem

Posted by pavel on July 8, 2012
Hello guys
Thank you both for the help. I fixed the code according to the known issues.

As to the codewarrior, is version 10.2 also available for free as the version 7.2? (to 128KB) I downloaded cw for coldfire family from freescale site so I supposed it was the latest version.

pa

RE: Coldfire V2 : parameter passing problem

Posted by Erich Styger on July 9, 2012
Yes, MCU10.2 comes as well with a free special edition with a code limitation. In case you consider using it with Processor Expert: http://mcuoneclipse.wordpress.com/2012/05/27/freertos-v7-1-1-released/ describes the latest embedded component port for it. Also available from the FreeRTOS community/interactive web site.

Hope this helps,
Erich


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