Re: cpp init & machine check

Hi Randall,
Thanks for your reply to my question. I was wondering if you happen 
to know what the _ctors addresses are for? In CW I see the _ctors 
values are all 0xFB00FB00 (not terminated by a null). This address is 
definitely out of range of the PB board. Can you tell me where these 
addresses are generated from?
According to the documentation of cpp init function:
Calls constructors of which the cpp exception handling initialization
is the first constructor, if exceptions are used.
Does this mean that the _ctors addresses are used for cpp exception 
handling? Any help would be greatly appreciated.

Lei


--- In [email protected], "Randall" <ryoung@n...> wrote:
>
> 
> "bne" is "branch not equal", and it implements the "for" loop.  The 
three
> instructions above the bne increment the pointer "constructor", 
dereference it,
> and compare it to 0x0.  If it's not zero, the bne instruction 
repeats the loop
> until it is.
> 
> What is the value in R12 (and CTR) when you get the machine check ?
> 
> Does the table stored at 0x405340 (_ctors) appear to contain a list 
of valid
> function addresses, terminated by a NULL (0x0) ?  R31 should point 
to one of the
> entries in the table, and R12 should have the address stored in the 
table.
> 
> At first blush, I'd guess you're trying to run this from internal 
RAM, and your
> program is too large.  I don't have my manual handy, but ISTR 
0x405340 is a bad
> address.
> 
> Randall Young
> Senior Software Engineer
> NavCom Technology, Inc
> A John Deere Company
> 
> > Hey guys,
> > I'm really stuck on this constructor function in the cpp-init. For
> > some reason Codewarrior keeps giving me machine check exceptions
> > during the branch command shown below:
> >
> > {
> > 003FA35C: 9421FFF0  stwu     SP,-16(SP)
> > 003FA360: 7C0802A6  mflr     r0
> > 003FA364: 90010014  stw      r0,20(SP)
> > 003FA368: 93E1000C  stw      r31,12(SP)
> > 	voidfunctionptr *constructor;
> >
> > 	/*
> > 	 *	call static initializers
> > 	 */
> > 	for (constructor = _ctors; *constructor; constructor++) {
> > 003FA36C: 3C600040  lis      r3,64
> > 003FA370: 3BE35340  addi     r31,r3,21312
> > 003FA374: 48000014  b        __init_cpp+0x28 (0x3fa388)
> > 		(*constructor)();
> > 003FA378: 819F0000  lwz      r12,0(r31)
> > 003FA37C: 7D8903A6  mtctr    r12
> > 003FA380: 4E800421  bctrl               //MACHINE CHECK
> > 	}
> > 003FA384: 3BFF0004  addi     r31,r31,4
> > 003FA388: 801F0000  lwz      r0,0(r31)
> > 003FA38C: 28000000  cmplwi   r0,0x0000
> > 003FA390: 4082FFE8  bne      __init_cpp+0x1c (0x3fa378)  //branch
> > to   003FA378
> >
> > }
> > 003FA394: 83E1000C  lwz      r31,12(SP)
> > 003FA398: 80010014  lwz      r0,20(SP)
> > 003FA39C: 7C0803A6  mtlr     r0
> > 003FA3A0: 38210010  addi     SP,SP,16
> > 003FA3A4: 4E800020  blr
> >
> > I'm not sure what is the bne instruction for, if anyone can help I
> > would really appreciated.
> >
> > Lei
> >
> >
> >
> >
> >
> > -----------------------------------------------------------
> > To learn more about Freescale Microcontrollers, please visit
> > http://www.freescale.com/mcu
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>






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